Skocz do pozycji: 1.

Tytuł:

Nanoscale Aluminum - Metal Oxide (Thermite) Reactions for Application in Energetic Materials

Autorzy:

Piercey, D. G.
Klapötke, T. M.

Powiązania:

https://bibliotekanauki.pl/articles/358693.pdf

Data publikacji:

2010

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego

Tematy:

nano-aluminum
materials
thermites
energetic materials

Opis:

Energetic materials fnd use in both military and civilian applications, however many commonly used materials suffer from serious defciencies including toxicity and high sensitivity. Nanothermites exhibit vastly differing characteristics compared to their well known micron scale relatives and through the use of various preparatory chemical techniques can be tailored to have a wide spectra of chemical and energetic properties. This may allow use as superior replacements of conventional energetic materials in various applications.

Źródło:

Central European Journal of Energetic Materials; 2010, 7, 2; 115-129
1733-7178

Pojawia się w:

Central European Journal of Energetic Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 2.

Tytuł:

Influence of Terfenol-D powder volume fraction in epoxy matirx composites on their magnetomechanical properies

Autorzy:

Mech, R.
Kaleta, J.

Powiązania:

https://bibliotekanauki.pl/articles/387154.pdf

Data publikacji:

2017

Wydawca:

Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej

Tematy:

magnetostriction
magnetic properties
smart materials
active materials

Opis:

In this paper the investigations of magnetostriction as well as DC magnetic properties for composites doped with Terfenol-D particles are presented. All investigations were performed for the materials with 35%, 46% and 70% volume fraction of the Terfenol-D particles surrounded by epoxy matrix. Moreover, the bulk Terfenol-D alloy was tested. The obtained results show that the magnetization of the composite materials increases with increasing the volume fraction of Terfenol-D particles. Similar dependence as for magnetization was observed for the magnetostriction measurements. Although the magnetostriction of composite material is smaller than for solid Terfenol-D it is still tens of times bigger than in case of traditional magnetostrictive materials. Obtained results gives opportunity to use these materials for variety applications such as actuators and sensors.

Źródło:

Acta Mechanica et Automatica; 2017, 11, 3; 233-236
1898-4088
2300-5319

Pojawia się w:

Acta Mechanica et Automatica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 3.

Tytuł:

SCREENSHOTS AND COPYRIGHT

Autorzy:

Nowak, Danuta

Powiązania:

https://bibliotekanauki.pl/articles/955903.pdf

Data publikacji:

2013

Wydawca:

Uniwersytet Marii Curie-Skłodowskiej w Lublinie. IATEFL Poland Computer Special Interest Group

Tematy:

authentic materials
copyright
materials' adaptation
exam preparation

Opis:

The present article attempts to show how important and easy it is to use authentic material in the classroom. However, the teacher who copies news reports from the Internet may infringe the copyright law. The article offers a comparative analysis of copyright laws in Common Law countries and the EU countries in relation to fair use. The article tries to determine whether teachers may copy, what teachers may copy, what to do with authentic materials as screenshots and how to adapt them to TELC, KET and PET examination tasks. The Author suggests some reading comprehension and grammar development activities designed using Paint and screenshots.

Źródło:

Teaching English with Technology; 2013, 13, 4; 23-37
1642-1027

Pojawia się w:

Teaching English with Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 4.

Tytuł:

Modern building materials

Autorzy:

Sadowska, Beata
Jimenez, José Ramón
Fernández Rodriguez, José María
Moreno Pérez, Fátima
Roldán Cañas, José
Rivas-Sánchez, Yair A.

Powiązania:

https://bibliotekanauki.pl/chapters/31029469.pdf

Data publikacji:

2019

Wydawca:

Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej

Tematy:

Building materials
environment
traditional material
industrialized materials

Opis:

Decisions taken both in the design process of buildings and their modernization should comply with basic requirements, such as: strength and stability, resistance to dampness and water, resistance to fire, heat insulation, sound insulation, durability, comforts and conveniences. Building materials should not have harmful effects on human health. In their production, factors that destroy the natural environment (e.g. freons that destroy the ozone layer in the atmosphere) should not be used. The aspects of utilization, safe storage and recycling possibilities are also important. Another criterion for choosing material solutions is their availability as well as local traditions. However, the deciding factor is usually the economic aspect (costs of materials, construction and assembly).

Źródło:

Buildings 2020+. Constructions, materials and installations; 53-105
9788365596703

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 5.

Tytuł:

Packaging Materials in General Technoeducation

Autorzy:

STOFFA, Ján

Powiązania:

https://bibliotekanauki.pl/articles/456010.pdf

Data publikacji:

2015

Wydawca:

Uniwersytet Rzeszowski

Tematy:

general technoeducation
packaging materials
packaging materials in general technoeducation
properties of packaging materials

Opis:

The study points to the unused possibility of including the theme of packaging materials in the educational process of general technoeducation It defines the concept of packaging materials in the narrow and broad sense It also characterizes the range of packaging materials used, their advantages and disadvantages. Also it points to specific aspects of packaging materials, in particular to the aspect of economic, health and hygiene, safety, aesthetic and environmental. It also addresses the issue of the impact of external factors on the properties of packaging materials. Epistemological value of packaging materials is illustrated in the case of paper as the most widely used packaging material. On the topic of the paper also some problematic questions are presented.

Źródło:

Edukacja-Technika-Informatyka; 2015, 6, 1; 239-243
2080-9069

Pojawia się w:

Edukacja-Technika-Informatyka

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 6.

Tytuł:

Nowoczesne materiały stalowe do wytwarzania okuć, łusek, korpusów pocisków rakietowych i artyleryjskich oraz pancerzy
Modern steel materials used in production of cartridge-cases, cartridges, bodies of rocket and artilery projectiles and armour

Autorzy:

Stępień, J.
Garbarz, B.
Burdek, M.
Marcisz, J.
Burian, W.

Powiązania:

https://bibliotekanauki.pl/articles/235146.pdf

Data publikacji:

2009

Wydawca:

Wojskowy Instytut Techniczny Uzbrojenia

Tematy:

materiały metalowe
materiały konstrukcyjne
metal materials
structure materials

Opis:

W wyniku realizacji projektów badawczych rozwojowych, projektów celowych, prac własnych dofinansowanych ze środków budżetowych oraz prac zleconych przez zakłady przemysłu obronnego, Instytut Metalurgii Żelaza (IMŻ) we współpracy z Politechniką Poznańską, wojskowymi instytutami badawczymi i wytwórcami rozwijanych wyrobów opracował nowoczesne materiały konstrukcyjne na elementy uzbrojenia. Opracowano również technologie wytwarzania wyrobów z tych materiałów, które znalazły zastosowanie m.in. w produkcji do amunicji okuć 120mm, korpusów silników rakietowych kalibru od 70 do 300mm, pierścieni wiodących do pocisków kalibru 35mm i skorup HE (high explosive). Obecnie rozpoczęto projekt mający na celu opracowanie supertwardych materiałów na bazie stopów żelaza z przeznaczeniem na pancerze. W celu zapewnienia dostaw specjalnych materiałów metalowych do zastosowań w przemyśle obronnym, przedstawiono koncepcję uruchomienia centrum produkcji i rozwoju metalowych materiałów konstrukcyjnych.
As a result of research and development projects, targeted projects, own projects subsidized with the domestic budget funds and research commissioned by defense industry plants, Institute for Ferrous Metallurgy in cooperation with Poznań University of Technology, military scientific institutes and manufacturers of the developed new products has worked out modern structural materials for elements of armament. Technologies for production of armament parts made from the new materials have been worked out. They are applied, among others, in production of 120mm cartridge cases, engine bodies of 70-300mm caliber rocket projectiles, leading rings for 35mm caliber missiles and HE (high explosives) shell cases. Currently a new project has been started. Its aim is to work out superhard materials on the basis of iron alloys dedicated for armour. In order to ensure supplies of special metallic materials used in defense industry, an idea of establishing centre for production and development of structural metallic materials was presented.

Źródło:

Problemy Techniki Uzbrojenia; 2009, R. 38, z. 111; 15-26
1230-3801

Pojawia się w:

Problemy Techniki Uzbrojenia

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 7.

Tytuł:

Investigation of mechanical properties and coefficients of sound insulation of innovative silicone composite material

Autorzy:

Lakov, L.
Ivanova, Y.
Jivov, B.
Aleksandrova, M.
Barovsky, N.

Powiązania:

https://bibliotekanauki.pl/articles/391426.pdf

Data publikacji:

2017

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Odlewnictwa

Tematy:

composites
sound insulation
soundproofing materials
heat insulating materials

Opis:

A new non-combustible, non-flammable, waterproof, long-lasting, heat-insulating composite material was made of glass foam granules (derived from glass waste) and a hydraulic inorganic binder in the form of a white Portland cement solution (CEM I 52.5 N), zeolite, airborne agent and water. The resulting composite is resistant to climatic temperature fluctuations, characterized by a coefficient of thermal conductivity of λ = 0.047 W/mK and is potentially applicable for the production of sound and heat insulating panels for non-bearing partition walls and external insulation of buildings. The technology for obtaining the product is in line with the current tendencies for the development of ecological productions through the utilization of waste materials and provides the opportunity to produce various standard monolith products suitable for direct use or further processing. Experimental studies of the acoustic and mechanical performance of standard experimental samples made from the developed composite material were carried out. The average sound insulation value is 30 dB. An average tensile strength of 0.036 MPa and an average compressive strength of 0.55 MPa were found.

Źródło:

Prace Instytutu Odlewnictwa; 2017, 57, 4; 245-251
1899-2439

Pojawia się w:

Prace Instytutu Odlewnictwa

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 8.

Tytuł:

Natural radioactivity of wastes

Autorzy:

Żak, A.
Isajenko, K.
Piotrowska, B.
Kuczbajska, M.
Ząbek, A.
Szczygielski, T.

Powiązania:

https://bibliotekanauki.pl/articles/148755.pdf

Data publikacji:

2010

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

natural radioactivity
waste
building materials
raw materials
radioactivity

Opis:

By-products of the combustion of coal (wastes) are often used for various types of construction (dwellings, roads, etc.). The legal regulations (The Ordinance of the Council of Ministers of 2 January 2007 “On the requirements for the content of natural radioactive isotopes of potassium K-40, radium Ra-226 and thorium Th-228 in raws and materials used in buildings for the residence of people and livestock, as well as in the industrial by-products used in the construction, and the control of the content of the aforementioned isotopes” – Law Gazette no. 4/2007 item 29) are in force in Poland. The regulations permit the possibility of utilization of raws and by-products basing upon the level of the natural radioactivity of the examined raws and materials. The article is a survey of the results obtained during the measurements of many types of raws and building materials for almost 30 years by the network of the laboratories in Poland. It is based upon the results stored in the database of the Central Laboratory for Radiological Protection (CLRP), Warsaw. The article tends to outline the radioactivity of the waste materials with respect to other raws and materials used in the construction industry. The article shows the possibilities for the use of by-products originating in the power stations and heat- and power stations (mainly ashes, slag and hinter) in the construction of dwellings and roads.

Źródło:

Nukleonika; 2010, 55, 3; 387-391
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 9.

Tytuł:

The Analysis of Physico-Chemical Properties of two Unknown Filter Materials

Autorzy:

Skoczko, I.
Szatyłowicz, E.

Powiązania:

https://bibliotekanauki.pl/articles/952346.pdf

Data publikacji:

2016

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

porous materials
water purification
properties of filtration materials

Opis:

One of the most important technological processes of water treatment is the process of filtration. Scientists and producers keep on searching new filtration materials which allow for better water purification, are simple in exploitation and do not add chemical substances to the treated water. Therefore, the aim of the present study was to analyze physical and chemical parameters of two unknown porous masses X1 and X2. Such physical parameters as color, granulation, bulk density, the equivalent diameter, the coefficient of uniformity and the porosity of the material were measured and determined. Additionally, the possibility of water treatment was studied during the filtration process in the laboratory tests. Chemical parameters were examined in the water flowing through the mass, such as pH, conductivity and COD-Mn as a general indicator of the content of organic substances in the water. Both studied porous masses were characterized by uniform size of particles. But they were not efficient enough in satisfactory reduction of oxygen consumption. Mass X2 slightly better adsorbed organic substances. It was found that the tested unknown mass filter slightly increase the pH of the filtered water.

Źródło:

Journal of Ecological Engineering; 2016, 17, 3; 148-154
2299-8993

Pojawia się w:

Journal of Ecological Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 10.

Tytuł:

Ceramic Porous Preforms Manufactured from Waste Materials

Autorzy:

Kremzer, Marek

Powiązania:

https://bibliotekanauki.pl/articles/2048747.pdf

Data publikacji:

2022

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

composite materials
ceramic preforms
waste materials
fly ashes

Opis:

The goal of this study is to develop a method of manufacturing porous ceramic skeletons used as semi-finished products for reinforcement of composite materials or as filters. For manufacturing skeletons, only waste materials from coal combustion (fly ashes and bottom slags) as well as rubber granules from used tires and car parts were used. These granules were a pore-forming agent that underwent thermal degradation during sintering process. The influence of sintering temperature, portion, and type of rubber granules on the porosity of developed ceramic skeletons was determined. The study of structure of base materials and the developed ceramic skeletons in a scanning electron microscope as well as their X-ray phase analysis were made. Results will allow to predict phases that can be formed on the metal-reinforcement interface during pressure infiltration.

Źródło:

Archives of Metallurgy and Materials; 2022, 67, 1; 283-288
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 11.

Tytuł:

Critical, Strategic and Deficit Raw Materials in the Waste of Electrical and Electronic Equipment and in Batteries and Accumulators

Autorzy:

Witkowska-Kita, Beata
Biel, Katarzyna
Blaschke, Wiesław
Orlicka, Anna

Powiązania:

https://bibliotekanauki.pl/articles/318573.pdf

Data publikacji:

2019

Wydawca:

Polskie Towarzystwo Przeróbki Kopalin

Tematy:

waste electrical and electronic equipment (WEEE)
batteries and accumulators
recyclable materials
critical raw materials
strategic raw materials
deficit raw materials

Opis:

This article presents the waste electrical and electronic equipment and batteries and accumulators as a potential source of critical, strategic and deficit raw materials. The dominant types of waste obtained after the disassembly of used electrical and electronic equipment are plastics: polypropylene (PP), acrylonitrile-butadiene-styrene (ABS), polystyrene (PS) and teflon and metals. These metals include: magnesium, cobalt, antimony and tantalum (critical raw materials), aluminum, nickel, iron and zinc (strategic raw materials) as well as copper and silver (deficit resources), as well as lead, tin, gold and cadmium. Batteries and accumulators are a source, among others metals such as: nickel and zinc (strategic raw materials), manganese and lithium (deficit resources), aluminum (strategic raw material), and cadmium, lead. The article presents the results of analysis of the material composition of the waste electrical and electronic equipment conducted at the Institute of Mechanised Construction and Rock Mining. It also presents the level of imports and exports of waste and scrap-metal that are the subject of this article. In addition, the article presents a source of information about waste and recycled materials.

Źródło:

Inżynieria Mineralna; 2019, 21, 1; 189-194
1640-4920

Pojawia się w:

Inżynieria Mineralna

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 12.

Tytuł:

Generating of electricity from magnetoelectric composite with use of changes in direction of magnetic field vector

Autorzy:

Mech, R.

Powiązania:

https://bibliotekanauki.pl/articles/347476.pdf

Data publikacji:

2017

Wydawca:

Akademia Wojsk Lądowych imienia generała Tadeusza Kościuszki

Tematy:

SMART materials
Energy Harvesting
magnetostriction
active materials
Terfenol-D

Opis:

Paper shows study on the magnetoelectric composite material placed in an external magnetic field with changing magnetic field vecotr. An experimental setup for investigation of magnetoelectric properties of magnetostrictive-piezoelectric material was prepared. The hybrid structure is made of magnetostrictive composite (based on Terfenol-D) and piezoelectric material. Experimental results shown the response of prepared hybrid material to the rate of changes of direction of magnetic field vector. Investigation were mainly focused on possibility of generating of electric power from prepared material. It was found that the prepared hybrid material exhibits magnetoelectric effect in the case of work when direction of magnetic field vector was changing. This effect might be use in Energy Harvesting applications.

Źródło:

Zeszyty Naukowe / Wyższa Szkoła Oficerska Wojsk Lądowych im. gen. T. Kościuszki; 2017, 4; 283-293
1731-8157

Pojawia się w:

Zeszyty Naukowe / Wyższa Szkoła Oficerska Wojsk Lądowych im. gen. T. Kościuszki

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 13.

Tytuł:

The New Methodology for Assessing of the Applicability of Elastomeric Materials in the Vibration Isolation Systems of Railway Lines

Autorzy:

Bednarz, J.

Powiązania:

https://bibliotekanauki.pl/articles/176943.pdf

Data publikacji:

2016

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

vibration isolation systems
elastomeric materials
properties of flexible materials

Opis:

The technical requirements for the determination of physical parameters of vibration isolating material have not been standardized in Europe and Poland yet, which significantly hinders the ability to compare vibration isolating materials offered on the market. Therefore, there is a need for establishing a norm that could be applied both for the determination of the physico-mechanical properties of elastic vibration isolation elements in rail transport for domestic and foreign producers as well as in their selection for application in a specific vibration isolation system. The paper presents a proposal to standardize the methodology of the estimation of vibration isolation materials physical parameters authorized for use in vibration isolation systems used in rail transport. Methodology for measuring the physico-mechanical parameters of vibration isolating material presented in the paper forms uniform test procedure developed based on a fragmentary norms for flexible materials testing. The use of the proposed research methodology enables the creation of a unified database of elastic materials which parameters will be easy to compare, and choice between them will become easier for designers of vibration isolation systems used in rail transport.

Źródło:

Archives of Acoustics; 2016, 41, 3; 573-578
0137-5075

Pojawia się w:

Archives of Acoustics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 14.

Tytuł:

Concept of an adaptive-tuned particles impact damper

Autorzy:

Żurawski, Mateusz
Zalewski, Robert
Chiliński, Bogumił Daniel

Powiązania:

https://bibliotekanauki.pl/articles/2055066.pdf

Data publikacji:

2020

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

particles impact damper
adaptive-passive damping
smart materials
granular materials

Opis:

The most popular devices for attenuation of mechanical vibrations are dampers or shock absorbers. Two main energy dissipation strategies can be generally distinguished: passive and active (semi-active). Passive vibration isolation methods are the most commonly used, mainly because of their simplicity and low maintenance costs. Among passive vibration attenuation techniques, also Particle Impact Dampers (PID) are involved. Classical PID solutions have some certain limitations. This paper aims at presenting the new concept of an adaptive tuned PID damper that can pretend to be placed among semi-active energy dissipation methods.

Źródło:

Journal of Theoretical and Applied Mechanics; 2020, 58, 3; 811-816
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 15.

Tytuł:

Analiza cech materiałowych kompozytowej warstwy wierzchniej regenerowanych wałów w aspekcie współpracy ze stykowym pierścieniem uszczelniającym
Analyzing the material and construction features of a composite surface of recomposed shafts with respect to co-operation with a contact o-ring

Autorzy:

Grabka, L.
Spałek, J.
Szweda, S.

Powiązania:

https://bibliotekanauki.pl/articles/186348.pdf

Data publikacji:

2010

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Technik Innowacyjnych EMAG

Tematy:

charakterystyka tworzyw kompozytowych
tworzywa kompozytowe
composite materials
composite materials characteristics

Opis:

Przedmiotem publikacji jest analiza cech materiałowo - konstrukcyjnych tworzyw kompozytowych stosowanych głównie w procesie regeneracji warstwy wierzchniej wałów maszyn roboczych. Ze względu na odmienne właściwości kompozytu i materiału rodzimego regeneracja warstwy wierzchniej skutkuje zmianą warunków współpracy stykowego pierścienia uszczelniającego z wałem. W opracowaniu przeanalizowano te cechy materiałów kompozytowych, które mają istotny wpływ na trwałość i hermetyczność węzła uszczelniającego.
The article presents the analysis of material and construction features of composite materials which are used chiefly in the re-composition of machine shafts surfaces. Due to different characteristics of the composite material and the original material, the re-composition of the surface results in the changing co-operation conditions of the contact O-ring with the shaft. The article analyzes these features of composite materials which have significant impact on the durability and air-tight sealing of the insulating element.

Źródło:

Mechanizacja i Automatyzacja Górnictwa; 2010, R. 48, nr 12, 12; 12-14
0208-7448

Pojawia się w:

Mechanizacja i Automatyzacja Górnictwa

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 16.

Tytuł:

The innovations in description of propriety of structures the hyper-elastic materials

Autorzy:

Żach, P.

Powiązania:

https://bibliotekanauki.pl/articles/247644.pdf

Data publikacji:

2010

Wydawca:

Instytut Techniczny Wojsk Lotniczych

Tematy:

plastics
hyperelastic materials
numerical simulation
identification of propriety elastomers materials

Opis:

The hyper-elastic materials e.g.: the elastomers, frothed structures PUR about open and closed pores, the materials using the matrix of natural rubber materials whether as well as synthetic the gels be practical used in different engineer applications from over 30 year s. They really several summers and intensive works on field of materiał engineering made possible extension the spectres of uses as well as the utilization of elastomers compositions. In this paper, will be presented built methodology of elasticity propriety materials with large deformation. In article be become presented method of identification and description of hyper-elastic materials from special return on numeric models the attention. Quantitative analysis be becomes executed in support about executed experimental investigations. The numeric permissive on comparison of received conception of description of hyper-elastic material worked out in support about theoretical foundations with results of experimental investigations analyses be become executed.

Źródło:

Journal of KONES; 2010, 17, 3; 533-538
1231-4005
2354-0133

Pojawia się w:

Journal of KONES

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 17.

Tytuł:

Analysis of abrasive wear of selected aircraft materials in various abrasion conditions

Autorzy:

Krzyżak, A.
Mucha, M.
Pindych, D.
Racinowski, D.

Powiązania:

https://bibliotekanauki.pl/articles/242294.pdf

Data publikacji:

2018

Wydawca:

Instytut Techniczny Wojsk Lotniczych

Tematy:

composite materials
tribology
carbon fibre reinforced polymer
CFRP
aerospace materials

Opis:

The use of composite materials is continuously increasing in modern transport. This process is especially noticeable in aviation. The mass percentage of epoxy resin composites in contemporary aircraft constructions is usually higher than 50%, and these materials must meet increasingly demanding requirements. In these circumstances, in addition to mass and strength, it is necessary to predict other properties of the material, such as abrasion resistance. The article presents the analysis of the process of abrasion of carbon fibre reinforced polymers reinforced with various fillers. Straight carbon fibre mats were used for the tests. In addition, powders of pumice, alumina, silicon carbide, and glass microspheres at various concentrations in relation to the matrix were used as fillers. In order to investigate the influence of external factors on the abrasion process, each group of samples was subjected to abrasion under different external conditions: in an insulated environment, in the presence of water and loose abrasives: brown fused alumina (BFA) and white fused alumina (WFA). The measurements were carried out using a precision balance and an electron microscope. The results allow concluding on which kind of filler and in what concentration contributes to improvement of the abrasion resistance of the composite material the most. In addition, it was found that the conditions in which abrasion occurs have a very large impact on the course of this process.

Źródło:

Journal of KONES; 2018, 25, 4; 217-222
1231-4005
2354-0133

Pojawia się w:

Journal of KONES

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 18.

Tytuł:

Effects of Co, Ni, and Cr addition on microstructure and magnetic properties of amorphous and nanocrystalline Fe86−xMxZr7Nb2Cu1B4 (M = Co, Ni, CoCr, and Cr, x = 0 or 6) alloys

Autorzy:

Łukiewska, A.
Świerczek, J.
Hasiak, M.
Olszewski, J.
Zbroszczyk, J.
Gębara, P.
Ciurzyńska, W.

Powiązania:

https://bibliotekanauki.pl/articles/147169.pdf

Data publikacji:

2015

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

amorphous materials
nanocrystalline materials
Mössbauer spectroscopy
invar effect
Curie temperature

Opis:

Mössbauer spectra and thermomagnetic curves for the Fe86-xMxZr7Nb2Cu1B4 (M = Co, Ni, CoCr, and Cr, x = 0 or 6) alloys in the as-quenched state and after the accumulative annealing in the temperature range 600–800 K for 10 min are investigated. The parent Fe86Zr7Nb2Cu1B4 amorphous alloy is paramagnetic at room temperature, and substitution of 6 at.% of Fe by Co, Ni, and CoCr changes the magnetic structure – the alloys become ferromagnetic, whereas replacing 6 at.% of Fe with Cr preserves the paramagnetic state. After the heat treatment at 600 K, the decrease of the average hyperfi ne fi eld induction, as compared to the as-quenched state, is observed due to the invar effect. After this annealing, the Curie temperature for all investigated alloys decreases. The accumulative annealing up to 800 K leads to the partial crystallization; α-Fe or α-FeCo grains with diameters in the range of 12–30 nm in the residual amorphous matrix appear.

Źródło:

Nukleonika; 2015, 60, 1; 103-108
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 19.

Tytuł:

Recycling of Waste Coconut Shells as Substitute for Aggregates in Mix Proportioning of Concrete Hollow Blocks

Autorzy:

Ganiron Jr, Tomas U.
Ucol-Ganiron, Nieves
Ganiron III, Tommy U.

Powiązania:

https://bibliotekanauki.pl/articles/1178350.pdf

Data publikacji:

2017

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

Coconut shells
construction materials
hollow blocks
recycled materials
technical specification

Opis:

Due to the environmental and economic crisis, this study focus on generating product using agricultural waste as well develop an alternative construction material that will lessen the social and environmental issues. It also paved the way to the recognition of using coconut shells and fiber as a substitute for aggregates in developing concrete hollow blocks. As a whole, the study' main concern is the environment and the construction and building technology to enhance natural world as well as building materials. This also aims to design a technical specification of concrete hollow block using coconut shell and fiber as aggregates that will meet the ASTM requirements in order to help contribute to the industry in saving the environment, to encourage the government to find solutions regarding the disposal to landfills of waste materials and save the environment, to provide new knowledge to the contractors and developers on how to improve the construction industry methods and services by using recycled coconut shells and fibers, and to sustain good product performance and meet recycling goals. A conventional concrete hollow block was compared to concrete hollow blocks with coconut shells and fibers of the same proportions. Observations from the tests performed were conducted in the laboratory where precise data were gathered and completely attained. Some of the interesting insights of the study are: (a) coconut shells and fibers are applicable as a partial substitute as coarse aggregates for concrete hollow blocks. (b) the good indicators of coconut shell and fiber quality as aggregate of concrete hollow blocks are particles, shape, and texture, resistance to crushing, absorption and surface moisture, grading, resistance to freezing and heating and light-weight.; (c) coconut shells and fibers are classified as miscellaneous material used for wall panels and partitions and (d) a non-load bearing type of hollow block because the compressive strength gained higher than the conventional concrete hollow blocks after 28th days

Źródło:

World Scientific News; 2017, 77, 2; 107-123
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 20.

Tytuł:

Characterization of nanostructured bulk cobalt triantimonide doped with tellurium and indium prepared by pulsed plasma in liquid method

Autorzy:

Zybała, R.
Schmidt, M.
Kaszyca, K.
Chmielewski, M.
Kruszewski, M. J.
Jasiński, M.
Rajska, M.
Ciupiński, Ł.

Powiązania:

https://bibliotekanauki.pl/articles/200831.pdf

Data publikacji:

2020

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

thermoelectric materials
nanostructured materials
skutterudite
energy harvesting
spark plasma sintering

Opis:

One of the ways to decrease thermal conductivity is nano structurization. Cobalt triantimonide (CoSb3) samples with added indium or tellurium were prepared by the direct fusion technique from high purity elements. Ingots were pulverized and re-compacted to form electrodes. Then, the pulsed plasma in liquid (PPL) method was applied. All materials were consolidated using rapid spark plasma sintering (SPS). For the analysis, methods such as X-ray diffraction (XRD), scanning electron microscopy (SEM) and scanning transmission electron microscopy (STEM) with a laser flash apparatus (LFA) were used. For density measurement, the Archimedes’ method was used. Electrical conductivity was measured using a standard four-wire method. The Seebeck coefficient was calculated to form measured Seebeck voltage in the sample placed in a temperature gradient. The preparation method allowed for obtaining CoSb3 nanomaterial with significantly lower thermal conductivity (10 Wm–1K–1 for pure CoSb3 and 3 Wm–1K–1 for the nanostructured sample in room temperature (RT)). The size of crystallites (from SEM observations) in the powders prepared was about 20 nm, joined into larger agglomerates. The Seebeck coefficient, α, was about –200μVK–1 in the case of both dopants, In and Te, in microsized material and about −400 μK−1 for the nanomaterial at RT. For pure CoSb3 , α was about 150 μVK−1 and it stood at −50 μVK−1 for nanomaterial at RT. In bulk nanomaterial samples, due to a decrease in electrical conductivity and inversion of the Seebeck coefficient, there was no increase in ZT values and the ZT for the nanosized material was below 0.02 in the measured temperature range, while for microsized In-doped sample it reached maximum ZT = 0.7 in (600K).

Źródło:

Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 1; 125-134
0239-7528

Pojawia się w:

Bulletin of the Polish Academy of Sciences. Technical Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 21.

Tytuł:

Bursztyn jako surowiec strategiczny
Amber as a strategic raw material

Autorzy:

Szamałek, K.

Powiązania:

https://bibliotekanauki.pl/articles/2085916.pdf

Data publikacji:

2016

Wydawca:

Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy

Tematy:

bursztyn
surowiec strategiczny
surowiec deficytowy
surowiec krytyczny
amber
strategic raw materials
critical raw materials
deficit raw materials

Opis:

Znaczenie i rola surowca mineralnego w gospodarce kraju czy świata jest dostrzegalna w używanych określeniach: surowiec deficytowy, krytyczny lub strategiczny. ustalenie ważności surowca w procesach gospodarczych, wiedza o źródłach jego pozyskiwania, barierach dostępu, kształtowaniu ceny na rynkach krajowym i międzynarodowym pozwalają na opracowanie strategii działania, w której należy uwzględnić cel działań, horyzont czasowy, rodzaj niezbędnych do zastosowania instrumentów i zakres współpracy międzynarodowej. O znaczeniu surowca dla kraju decyduje nie tylko wolumen obrotów i wielkość produkcji uzyskiwanej dzięki jego zastosowaniu, lecz także względy historyczne, kulturowe i społeczne. Tak jest w przypadku bursztynu. Autor przedstawia argumenty przemawiające za uznaniem bursztynu w Polsce za surowiec o znaczeniu strategicznym i wskazuje na konieczność wprowadzenia efektywnych instrumentów, które zapewnią jego dalsze pozyskiwanie i wykorzystanie.
The importance and the role of minerals in the economy of a country or the world is manifested by the use of the following terms: scarce mineral, critical mineral, and strategic mineral. Validity of the raw material in the economic processes and the knowledge about the sources of its acquisition, access barriers, and the shaping of prices on the domestic and international market allow developing a strategy for action. The strategy must take into account the objective of the action, time horizon, kind of the instruments needed to apply, and scope of international cooperation. The importance of the raw material for the country is not only the volume of turnover and volume of production obtained thanks to its application. This also means its importance for historical, cultural and social reasons, which is the case with amber. The author presents arguments in favour of both considering amber in Poland as a raw material of strategic importance and the necessity for introducing effective instruments to ensure its further extraction and use.

Źródło:

Biuletyn Państwowego Instytutu Geologicznego; 2016, 466; 291-295
0867-6143

Pojawia się w:

Biuletyn Państwowego Instytutu Geologicznego

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 22.

Tytuł:

Funkcjonalne hybrydowe nanomateriały - od pomysłu poprzez laboratorium do biznesu
Functionalized hybrid materials-from concept, through laboratory to business

Autorzy:

Schroeder, G.
Łęska, B.
Kurczyńska, J.

Powiązania:

https://bibliotekanauki.pl/articles/1208054.pdf

Data publikacji:

2012

Wydawca:

Stowarzyszenie Inżynierów i Techników Przemysłu Chemicznego. Zakład Wydawniczy CHEMPRESS-SITPChem

Tematy:

receptory molekularne
chemia materiałowa
funkcjonalizowane materiały
nanomateriał
materiały hybrydowe
molecular receptors
materials chemistry
functionalized materials
nanomaterials
hybrid materials

Opis:

Funkcjonalne materiały na bazie receptorów molekularnych, to nowy dynamicznie rozwijający się kierunek w chemii. Poznanie zasad wzajemnego oddziaływania cząsteczek, opanowanie wydajnych metod syntezy oraz umiejętność przewidywania właściwości materiałów zawierających receptory molekularne, stworzyły realne podstawy do realizacji projektów od pomysłu, poprzez badania podstawowe do komercyjnego zastosowania. W artykule przedstawiono drogę od idei do materiału użytkowego, którego właściwości zależą od natury receptora molekularnego. Dla wybranych układów przedstawiono komercyjne zastosowanie hybrydowych nanomateriałów nieorganiczno-organicznych.
Functionalized materials, based on molecular receptors, determine new direction of dynamic development in chemistry. The knowledge about interactions between molecules, the control of efficient synthesis methods and the ability of properties prediction of materials carrying molecular receptors, generate real foundation for the fulfillment of projects started from the concept, through the research studies, to commercial application. The paper describes the way from the idea to the material, which properties depend on the nature of a molecular receptor. It also includes commercial applications of some hybrid inorganic-organic nanomaterials.

Źródło:

Chemik; 2012, 66, 3; 196-205
0009-2886

Pojawia się w:

Chemik

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 23.

Tytuł:

Feasibility of alkali-activated mining waste foamed materials incorporating expanded granulated cork

Autorzy:

Beghoura, I.
Castro-Gomes, J.
Ihsan, H.
Estrada, N.

Powiązania:

https://bibliotekanauki.pl/articles/88897.pdf

Data publikacji:

2017

Wydawca:

Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa

Tematy:

mining waste mud
alkali activated materials
expanded cork
foamed materials
porosity

Opis:

Different combinations of mining waste mud, grounded waste glass, Portland cement, metakaolin and expanded cork were mixed together with alkaline activators (sodium silicate and sodium hydroxide solution) and as well aluminum powder or hydrogen peroxide to produce foamed lightweight materials. The size of the mineral materials is under 500 µm and expanded cork particles size is between 2 to 4 mm. The expanded cork added to the mixes changed between 10 to 40% volume of total solids. The influence of expanded cork on compressive strength was investigated. Precursors and activators were mixed together to produce a homogeneous mixture, which was placed into a cubic mold (40 x 40 x 40 mm³), and cured at a temperature of 60°C, for 24 hours. After curing process, samples without foaming agents achieved the maximum compressive strength of 14.7 and 19.5 MPa for 7 and 28 days respectively. The porosity was observed by the naked eye of large voids in a range of 4 mm in size. Microstructure analyses were carried on by SEM. Samples made with aluminum powder showed higher volume increase about 358% compared with samples made with hydrogen peroxide that presented a 141% volume increase. This preliminary study shows the feasibility to produce new improved lightweight foamed alkali activated materials incorporating expanded cork with potential applications in artistic, architectural, and historical heritage restoration.

Źródło:

Mining Science; 2017, 24; 7-28
2300-9586
2353-5423

Pojawia się w:

Mining Science

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 24.

Tytuł:

Conditions of materials choice in manufacturing of pressure originated details

Autorzy:

Muiznieks, G.
Gerins, E.

Powiązania:

https://bibliotekanauki.pl/articles/386410.pdf

Data publikacji:

2008

Wydawca:

Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej

Tematy:

materiałoznawstwo
testowanie materiałów
właściwości mechaniczne
materials technology
materials testing
mechanical properties

Opis:

Materials are evolving today faster than at any time in history. In nowadays developing a technique and technology considerably enlarge the exposure of the applicable materials, new materials are created still with much better mechanical and technological properties. Their development and prevalence quickly increase. Today wide use such materials that still recently call by future materials. In the several responsible engineering industry, as well as instrument engineering and other industries do better with “high – performance” composites, new engineering ceramics, high – strength polymers etc., what had previously been done with metals. Choosing of materials is very important in several engineering industries, construction and instrument engineering industries, for example, crash of bench constructions is one of the reasons that the engineer who designed them used wrong materials or did not understand the properties of those used. Therefore for rational utilization materials, we need to know not only their properties, but also need understand factors, witch provides this properties. Therefore we should know how to select materials which best fit the demands of the design – economic and aesthetic demands, as well as demands of strength and durability. Choice of materials of pressure originated details, as also many manufacturing of other important details, which is one of the most actual problems in nowadays. First of all this article shows advantages and disadvantages of the conditions of materials choice of pressure originated details in. The most rational conditions of materials choice, way how to eliminate possibility mistakes, witch can lead down to different difficulties are given for the manufacturing of the definite group of details. There is an example witch describes conditions of materials choice for oil flooded screw compressors. The denotations of different standards of the utilized materials are analyzed in this article. As well as the economic parameters of the various materials in the manufacturing of the oil flooded screw compressors are analyzed. At the end of the article are given possibilities of the improving of materials. We can achieve improving of materials with different materials processing methods, which I had analyzed, for example, using mechanical, thermal, thermal-chemical processing or using different surfaces covering. In nowadays thermal processing method based on metal physic, dislocation theory and changes of metal structure regularity. These processing methods improve physical and mechanical properties of materials.

Źródło:

Acta Mechanica et Automatica; 2008, 2, 4; 75-80
1898-4088
2300-5319

Pojawia się w:

Acta Mechanica et Automatica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 25.

Tytuł:

Znaczenie i wymiary bezpieczeństwa państwa w zakresie surowców nieenergetycznych
Significance and dimensions of state security in respect of non-energy raw materials

Autorzy:

Zamęcki, Ł.

Powiązania:

https://bibliotekanauki.pl/articles/347752.pdf

Data publikacji:

2011

Wydawca:

Akademia Wojsk Lądowych imienia generała Tadeusza Kościuszki

Tematy:

bezpieczeństwo surowcowe
surowce nieenergetyczne
raw materials security
non-energy raw materials

Opis:

Bezpieczeństwo surowcowe państw w zakresie surowców nieenergetycznych, mimo że często niedostrzegane, bądź postrzegane tylko przez pryzmat rynkowy, pełni znaczną rolę od momentu rozwoju gospodarek industrialnych po dzień dzisiejszy. W ciągu wieków zmienia się jedynie lista surowców nieenergetycznych mających wpływ na ogólne bezpieczeństwo kraju. Zależna jest ona bowiem od potrzeb przemysłu konkretnego systemu gospodarczego. Zgodnie z podejściem rynkowym bezpieczeństwo surowcowe traktować należy jako część ogólnego bezpieczeństwa ekonomicznego państwa, rozumianego w kategoriach pewności dostaw surowców dla zakładów przemysłowych na poziomie gwarantującym wykorzystywanie większości mocy produkcyjnych. Takie ujęcie dominuje wśród ekonomistów. Natomiast z punktu widzenia politycznego surowce stanowią istotny element ogólnego bezpieczeństwa państwa. Warunkują siłę militarną państwa oraz coraz częściej stanowią narzędzie prowadzenia konfliktów międzypaństwowych. Zagrożenia/wyzwania dla bezpieczeństwa surowcowego mogą wynikać z co najmniej pięciu sfer: geologicznej, technicznej, ekonomicznej, politycznej i środowiskowej. Na podstawie tych zagrożeń można wyznaczyć test bezpieczeństwa surowcowego państwa, składający się z kilkunastu pytań. Jednocześnie współczesne państwa podejmują działania na rzecz zapewnienia sobie bezpieczeństwa surowcowego. Wykorzystują do tego m.in. instrumenty o charakterze prawnym, politycznym, ekonomicznym, technicznym czy kulturowym.
Non-energy raw materials security is an important aspect of state security. It has an influence on the social and economic development of the state. The main aim of the paper is to emphasize the theoretical paradigms, aspects, conditions and role of non-energy raw materials security. The paper refers to historical and contemporary examples (Poland, China and EU). The paper also underlines the main methods of ensuring raw materials state security.

Źródło:

Zeszyty Naukowe / Wyższa Szkoła Oficerska Wojsk Lądowych im. gen. T. Kościuszki; 2011, 3; 61-69
1731-8157

Pojawia się w:

Zeszyty Naukowe / Wyższa Szkoła Oficerska Wojsk Lądowych im. gen. T. Kościuszki

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 26.

Tytuł:

Contact materials used in low voltage electrical relays

Autorzy:

Książkiewicz, A.

Powiązania:

https://bibliotekanauki.pl/articles/97273.pdf

Data publikacji:

2015

Wydawca:

Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej

Tematy:

contact materials
relays
rivets

Opis:

Low-voltage relays are widely used in many areas of electrical applications. There are used for such applications as protection, signalization or control of electrical installations. There all are similar in many ways were it comes to construction and operating principles. However for different applications different contact materials must be used. There are many materials used for contacts in electrical appliances. In this paper contact materials used especially in low-voltage electromechanical relays are described. Their electrical and mechanical properties are characterised.

Źródło:

Computer Applications in Electrical Engineering; 2015, 13; 300-309
1508-4248

Pojawia się w:

Computer Applications in Electrical Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 27.

Tytuł:

Initial biocompatibility assessment of ceramic material intended for application in implantable heart assist device

Autorzy:

Janiczak, K.
Zawidlak-Węgrzyńska, B.
Gawlikowski, M.
Gonsior, M.
Kustosz, R.

Powiązania:

https://bibliotekanauki.pl/articles/284808.pdf

Data publikacji:

2017

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

biomaterials
ceramic materials
implantation

Źródło:

Engineering of Biomaterials; 2017, 20, no. 143 spec. iss.; 67
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 28.

Tytuł:

Results for modern bandaging materials application in alveolitis treatment

Autorzy:

Shevela, T. L.
Pohodenko-Chudakova, I. O.
Groshev, E. Y.

Powiązania:

https://bibliotekanauki.pl/articles/285401.pdf

Data publikacji:

2011

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

biomaterials
bandaging materials
alveolitis

Źródło:

Engineering of Biomaterials; 2011, 14, no. 109-111 spec. iss.; 13-14
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 29.

Tytuł:

Chitosan based drug delivery systems

Autorzy:

Piegat, A
Goszczyńska, A.
Niemczyk, A.

Powiązania:

https://bibliotekanauki.pl/articles/285591.pdf

Data publikacji:

2016

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

drugs
polymeric materials
chitosan

Opis:

One of the research area in which polymeric materials are intensively explored, deals with the controlled drug delivery systems (DDSs), allowing for drugs distribution directly to the desired site of biological activity. The morphology of polymeric colloidal drug carriers can be described as a construction of a core-shell type. Depending on the chemical or physical bonds providing stability of those systems and the type of interactions between the drug and the polymer, among polymeric DDSs the following morphological structures can be distinguished: micelles, dendrimers, liposomes, niosomes, polymerosomes and micro- and nanocapsules [1]. The main advantages of those systems are the preparation of particles with desired size (diameter from nano to micrometers) during their synthesis / formation and high specific surface area, which can be modified by the appropriate chemical composition of the surface improving the efficiency of a drug delivery. Chitosan is biopolymer derived from chitin, that is characterised by biodegradability, biocompatibility, mucoadhesion and antimicrobial activity [2,3]. Taking into account the overall advantages of this polymer and the possibility of modification due to the accessible functional groups i.e. hydroxyl and amine, chemically modified chitosan is one of the most promising biomaterials for DDS. In order to obtain micelle structures by selfassemby in aqueous environment several hydrophobically modified chitosan derivatives, such as – stearic acid-modified chitosan [4], palmitic anhydridemodified chitosan [5], linolenic acid-modified chitosan [6], have been synthesized. The micelles prepared by these derivatives in the aqueous medium contain internal hydrophobic moieties as drug reservoir and external hydrophilic chitosan chains as surrounding shell. The above mentioned micellar systems allow encapsulation of hydrophobic antitumor drugs e.g. doxorubicin or paclitaxel due to the compatibility between the hydrophobic core and hydrophobic drug affecting the drug loading and regulate drug release. Another important group of chitosan based micro- and nanoparticles are those dedicated for gastric infection treatment. The use of chitosan in this specific application is mainly related with the mucoadhesive properties of chitosan resulted from the electrostatic interactions between its positively charged free amine groups and the negatively charged gastric mucins at the acidic stomach pH. Several problems such as high solubility of chitosan under stomach acidic conditions, low retention time and difficulty in crossing the mucus barrier have been observed in those systems [7]. Therefore various crosslinking methods e.g. with glutaraldehyde [8], genipin [9] or sodium triphosphate pentabasic (TPP) solution [10] were investigated in order to minimize these problems. The nanotechnological production of the polymeric drug carriers, as well as the disadvantages of already developed chitosan based drug delivery systems induce the NANOENCAP project concept on the development and characterization of new dendrimeric micelles polymeric systems, with rigidly defined chemical structure, allowing the encapsulation of several drugs and their controlled release, and thus forming the so-called multidrug therapy systems. To provide the biocompatibility of new polymeric materials the monomer / reactant with proven biocompatibility or naturally occurring in the human body are chosen. According to the assumptions of the project the amphiphilic character of the proposed multi-functional polymeric drug delivery systems is going to enable the encapsulation of at least two drugs, matching latest trends in the research on DDS models in multi-therapy. As an exemplary multi-drug therapy in this project, the combine therapy of peptic ulcer disease was chosen. In this work we would like to present the short review of chitosan based drug delivery systems and the concept of the project as well as preliminary studies on new chitosan derivatives and the possibility of synthesis new micellar structures.

Źródło:

Engineering of Biomaterials; 2016, 19, 138; 27
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 30.

Tytuł:

Radiation–induced synthesis of polymeric nanogels

Autorzy:

Kadłubowski, S.
Ulański, P.
Rosiak, J. M.

Powiązania:

https://bibliotekanauki.pl/articles/283777.pdf

Data publikacji:

2017

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

nanogels
polymeric materials
radiation

Źródło:

Engineering of Biomaterials; 2017, 20, no. 143 spec. iss.; 33
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 31.

Tytuł:

Vibrational spectroscopy investigation of montmorillonite-chitosane nanocomposite materials

Autorzy:

Paluszkiewicz, C.
Stodolak, E.

Powiązania:

https://bibliotekanauki.pl/articles/283827.pdf

Data publikacji:

2011

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

spectroscopy
chitosan
nanocomposite materials

Opis:

Biomaterials basing on natural polysaccharides, i.e. hiauronic acid, alginate, chitosane are an alternative for already applied bioresorbable synthetic materials basing on synthetic polyhydroxy acids. Their main advantages are good accessibility, low cost, easy forming and high biocompatibility. Additionally , they are a perfect matrix for bioactive nanoparticles i.e. hydroxy apatite (HAp), tricalcium phosphate (TCP) and silica (SiO2). The work presents results of research on nanocomposite consisting of chitosane matrix (CS) modified with a nanofiller, which was natural montmorillonite (MMT). Nanocomposite foils were produced by the casting method. In order to induce better biocompatibility, the surface of the CS/MMT composite was neutralized (bath in NaOH solution). The nanocomposite foils were subjected to a bioactivity test by incubation in SBF at 37oC for 7 days. It was observed that the CS/ MMT material surface showed a local supersaturation, which was a result of apatite nucleation. The CS/ MMT nanocomposites were investigated using FT-IR ( Fourier Transform Infrared Spectroscopy) and Fourier Raman Spectroscopy. FTIR measurements o f the samples were carried out on the transmission and reflection modes. The FTIR microscopy spectra were collected using BioRad Excalibur with ATR attachment as well as microscope UMA500 equipped with MCT detector. Spectra were measure at 4 cm -1 resolution in the region from 4 000 cm -1 to 600 cm -1 . FT-Raman spectra were obtained using a FTS 6000 Bio-Rad spectrometer with Ge detector. The samples were excited with a Nd-YAG laser (1064nm). Additional all materials in all steps experiments were observed under Scanning Electron Microscopy (Nova Nano SEM). Vibrational spectroscopy methods (FT Raman and FTIR) can be used for investigation of nanocomposite foils basing on biopolymers. High sensitivity the applied spectroscopy techniques show that in the result of the neutralization of CS/ MMT foil (via incubation in NaOH solution the biopolymer chain breaks. This phenomena is visible by intensity ratio between COC/COH bands. Increase of reactivity of chitosane chain lead to entrapment of PO4+3-, which is the origin of the apatite forms nucleation process. Chemical treatment of the nanocomposite foils, i.e. NaOH washes in fluences their chemical structure and microstructure. Neutralisation of the foils is the first processing stage which precedes the potential use o fCS/ MMT foils in biomedical applications. The materials show a tendency to apatite crystallisation which may support regeneration of damaged bone tissue. The applied spectroscopic methods allowed to observe changes in the whole volume of the sample. Individual ATR measurements taken at various spectral ranges and penetration depths allow to observe subtle changes in the polymer matrix caused by chemical treatment (NaOH and SBF incubation). Results of the investigations indicate that in the CS/ MMT systems new chemical bonds and related to them vibrations appear. Quantity and quality of the interact ions is related to characteristics of the nanoparticle and the presence of forming apatite structures.

Źródło:

Engineering of Biomaterials; 2011, 14, no. 109-111 spec. iss.; 44
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 32.

Tytuł:

Department of Economic and Mining Geology

Autorzy:

Mucha, J.

Powiązania:

https://bibliotekanauki.pl/articles/184170.pdf

Data publikacji:

2016

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH

Tematy:

coal
salt
chemical materials

Źródło:

Geology, Geophysics and Environment; 2016, 42, 2; 223-225
2299-8004
2353-0790

Pojawia się w:

Geology, Geophysics and Environment

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 33.

Tytuł:

Analiza deformacji materiałów kompozytowych w oparciu o pewien model niesprężysty
Study of deformation in composite material based on a non-elastic model

Autorzy:

Kulisiewicz, M.
Piesiak, S.
Bocian, M
Jamroziak, K.

Powiązania:

https://bibliotekanauki.pl/articles/236069.pdf

Data publikacji:

2005

Wydawca:

Wojskowy Instytut Techniczny Uzbrojenia

Tematy:

materiały kompozytowe
composite materials

Opis:

Materiały kompozytowe ze względu na pewne swoje właściwości znalazły zastosowanie w konstrukcjach zwanych lekkimi osłonami balistycznymi. Takie konstrukcje w zastosowaniach wojskowych narażone są na obciążenia udarowe, ktore generowane są poprzez energię uderzenia masą skupioną (pociskiem). Dotychczasowe analizy tego zjawiska zakładają zwykle liniowo-sprężystą reakcję sił oporu materiału przebijanego na masę przebijającą. W pracy zaproponowano procedurę analizy własności opisujących zjawisko przebicia materiałów wykorzystując wybrany model niesprężysty.
Composite materials are commonly used in light ballistic screens and in their military applications they often are subjected to shocks by the hits of bullets. Typical studies usually assume the linear-elastic reaction of material’s resisting forces against penetrating mass. In the paper a procedure for analysis of properties describing the phenomenon of penetration in the material by the non-elastic model is presented.

Źródło:

Problemy Techniki Uzbrojenia; 2005, R. 34, z. 95; 197-206
1230-3801

Pojawia się w:

Problemy Techniki Uzbrojenia

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 34.

Tytuł:

Influence of dimensional proportions of cylindrical explosive on resulting blast wave

Autorzy:

Panowicz, R.
Trypolin, M.
Konarzewski, M.

Powiązania:

https://bibliotekanauki.pl/articles/247380.pdf

Data publikacji:

2016

Wydawca:

Instytut Techniczny Wojsk Lotniczych

Tematy:

materials engineering
mechanical engineering

Opis:

Explosives are broadly used today in many applications, both civilian and military. Many experiments involving explosives use either ball or cylinder charges. However, there can be raised a question whether an exact shape influences the resulting blast wave, and, additionally, if the length to diameter ratio of the cylinder influences the wave. To answer the question, numerical analysis was conducted. A 3D model of the charge was constructed in LS-Prepost software and calculated with use of an explicit FEM method in LS-DYNA software. To determine the change of character of the blast wave, the dimensions of the charge change, whereas the mass and distance from the centre of the charge are constant. Several length to diameter ratios was tested, starting from 0.25, to 2, in 0.25 increments. Two explosives, HMX and TNT, were used. As expected, the resulting Blast wave was different in each case, with 100% difference in pressure values between 0.25 and 2 L to D ratios, especially along the length axis of the cylinder. The results show that the exact diameters of the charges need to be taken into consideration while determining a type of charge to be used as well as determining the goal to be achieved during a particular conducted experiment.

Źródło:

Journal of KONES; 2016, 23, 4; 375-380
1231-4005
2354-0133

Pojawia się w:

Journal of KONES

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 35.

Tytuł:

Comparison of selected contact materials used in low-voltage relays

Autorzy:

Książkiewicz, A.

Powiązania:

https://bibliotekanauki.pl/articles/378085.pdf

Data publikacji:

2015

Wydawca:

Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej

Tematy:

contact materials
relays
rivets

Opis:

Low-voltage relays are widely used in many areas of electrical applications. There are used for such applications as protection, signalization or control of electrical installations. There all are similar in many ways were it comes to construction and operating principles. However for different applications different contact materials must be used. There are many materials used for contacts in electrical appliances. In this paper contact materials used especially in low-voltage electromechanical relays are described. Their electrical and mechanical properties are characterised.

Źródło:

Poznan University of Technology Academic Journals. Electrical Engineering; 2015, 82; 207-212
1897-0737

Pojawia się w:

Poznan University of Technology Academic Journals. Electrical Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 36.

Tytuł:

Compatibility Study of 2,6-Diamino-3,5-dinitropyridine-1-oxide with Some Energetic Materials

Autorzy:

Li, X.
Wang, B.-L,
Lin, Q.-H.

Powiązania:

https://bibliotekanauki.pl/articles/358871.pdf

Data publikacji:

2016

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego

Tematy:

compatibility
energetic materials
ANPyO

Opis:

For the application of 2,6-diamino-3,5-dinitropyridine-1-oxide (ANPyO) in composite explosives, the compatibility of ANPyO with some energetic materials was studied by the use of differential scanning calorimetry (DSC), where the energetic materials were cyclotrimethylenetrinitramine (RDX), cyclotetramethylenetetranitramine (HMX), 3,4-dinitrofurazanfuroxan (DNTF), hexanitrohexazaisowurtzitane (CL-20), 2,4,6-trinitrotoluene (TNT), 2,4,6-triamino-1,3,5-trinitrobenzene (TATB), 3-nitro-1,2,4-triazol-5-one (NTO), 2,6-diamino-3,5-dinitropyrazine-1-oxide (LLM-105), 5-amino-1H-tetrazole nitrate (5-ATEZN), ammonium perchlorate (AP), potassium perchlorate (KP), aluminum powder (Al), boron powder (B), magnesium hydride (MgH2) and magnesium borohydride (Mg(BH4)2). The results showed that the binary systems of ANPyO/CL-20, ANPyO/NTO, ANPyO/5-ATEZN, ANPyO/Al, ANPyO/B, ANPyO/MgH2 and ANPyO/Mg(BH4)2 are compatible, and that the systems of ANPyO with RDX, LLM-105, HMX, AP and KP are sensitive, and with DNTF, TNT and TATB are incompatible.

Źródło:

Central European Journal of Energetic Materials; 2016, 13, 4; 978-988
1733-7178

Pojawia się w:

Central European Journal of Energetic Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 37.

Tytuł:

Phase constitution of an LaFe11.0Co0.8(Si0.4Al0.6)1.2 alloy investigated by Mössbauer spectroscopy

Autorzy:

Gębara, P.
Pawlik, P.
Wysłocki, J. J.
Szwaja, M.

Powiązania:

https://bibliotekanauki.pl/articles/147912.pdf

Data publikacji:

2013

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

magnetocaloric materials
Mössbauer spectroscopy

Opis:

In the present work the phase constitution and magnetic ordering of the magnetocaloric LaFe11.0Co0.8(Si0.4Al0.6)1.2 alloy in the as-cast state and after annealing at 1323 K for 1 h (in case of ribbons) and 49 days (in case of bulk) were studied. For bulk and ribbon samples in as-cast state three crystalline phases were identified: dominant ferromagnetic alfa-Fe, minor ferromagnetic La(Fe,Co)Si and traces of paramagnetic La(Fe,Si)13 phase. Appropriate heat treatment resulted in the evolution of phase constitution of the alloy, where two crystalline phases were developed: the dominant paramagnetic La(Fe,Si)13 phase and a minor fraction of the ferromagnetic alfa-Fe for both bulk and ribbon samples.

Źródło:

Nukleonika; 2013, 58, 1; 113-116
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 38.

Tytuł:

Models For Solving The Tariff Optimization Problem

Autorzy:

Pytlak, R.
Stecz, W.

Powiązania:

https://bibliotekanauki.pl/articles/409510.pdf

Data publikacji:

2014

Wydawca:

Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej

Tematy:

sustainability
Dismantling
materials management

Opis:

We present the methods of telecommunication tariff optimization from a point of client’s view. A client which wants to minimize his monthly fees tries to choose a proper tariff model. In case of large companies these models are more complicated and the optimization models should be used. We describe a simple MIP models and their modifications solved with CLP solvers. All the examples were solved with ILOG and ECLiPSe MIP and CLP solvers.

Źródło:

Research in Logistics & Production; 2014, 4, 2; 119-133
2083-4942
2083-4950

Pojawia się w:

Research in Logistics & Production

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 39.

Tytuł:

SELECTING AN E-(TEXT)BOOK: EVALUATION CRITERIA

Autorzy:

Marczak, Mariusz

Powiązania:

https://bibliotekanauki.pl/articles/941189.pdf

Data publikacji:

2013

Wydawca:

Uniwersytet Marii Curie-Skłodowskiej w Lublinie. IATEFL Poland Computer Special Interest Group

Tematy:

digital coursebooks
interactive materials

Opis:

This paper aims to propose a repository of pre-use evaluation criteria for language teachers who wish to introduce e-books or e-textbooks to their own teaching practices. By selectively using a set of such criteria, they will be able to evaluate to what extent a given e-book/e-textbook lends itself to utilisation within their own teaching context. The paper briefly reviews the potential advantages of technology-enhanced language teaching. Then, it presents a range of manners in which e-books have been defined, outlines their most essential features, and demonstrates exemplary classifications of e-book types. The evaluation criteria proposed are informed by an analysis of three independent studies into the guidelines for e-book and e-textbook design, as well as the types and features of e-books presented within the paper. The outcome is a list of evaluation criteria pertaining to three aspects of an e-book: (i) layout and design; (ii) content and functionalities; and (iii) the reading device, file format and distribution.

Źródło:

Teaching English with Technology; 2013, 13, 1; 29-41
1642-1027

Pojawia się w:

Teaching English with Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 40.

Tytuł:

Role of ore mineralogy in selecting beneficiation route for magnesite-dolomite separation

Autorzy:

Yehia, A.
Al-Wakeel, M.

Powiązania:

https://bibliotekanauki.pl/articles/110660.pdf

Data publikacji:

2013

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

magnetic separation
refractory materials

Opis:

Characterization and beneficiation of magnesite-dolomite sample were performed. The role of ore mineralogy in selecting the most adequate concentration method for magnesite-dolomite separation was found to be detrimental. The microscopic analysis showed that dolomite is stained with goethite and lepidocrocite (weakly magnetic minerals), while magnesite is stained with hematite and magnetite (highly magnetic mineral). A dry magnetic separation technique was used to separate dolomite from magnesite. The magnetic separation of the sample resulted in a magnesite concentrate product assaying 1.12% CaO with 46.02% recovery and CaO/SiO2 molar ratio = 1.62. This magnesite product is suitable for basic refractory. Besides, middling fraction was produced, containing 44.63% magnesite and 10.95% dolomite. This product is suitable for making low-loss forsterite dielectrics.

Źródło:

Physicochemical Problems of Mineral Processing; 2013, 49, 2; 525-534
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 41.

Tytuł:

Study of anisotropic strength properties of shale

Autorzy:

Zheng, Danzhu
Miska, Stefan
Ziaja, Małgorzata
Zhang, Jianguo

Powiązania:

https://bibliotekanauki.pl/articles/298789.pdf

Data publikacji:

2019

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH

Tematy:

shale rocks
anisotropic materials

Opis:

Shale has been known to be the source of wellbore instability during the drilling process. Organic rich shales are anisotropic due to their laminated structure and chemical properties. The goal of this study is to evaluate anisotropic mechanical properties of shale by triaxial tests, and predict shale anisotropic properties by well logging data interpretation. Shale samples were prepared with bedding plane inclination angles equal to 0 degrees, 45 degrees, and 90 degrees. Young's modulus, shear modulus, and Poisson’s ratio in different directions were measured for a sample with 0 degrees bedding plane inclination angle. Parameters of the stiffness tensor were calculated by mechanical properties. Compressive strength was measured under different confining pressures of 0 psi, 500 psi, 1000 psi, and 1500 psi. The strength properties of shale samples were evaluated by both compressive strength and tensile strength. Simple Plane of Weakness and Modified Cam Clay failure criteria were applied to describe shear failure mechanisms. A scanning electron microscope method was used for the comparison of micro structures between the intact shale sample and failed sample with different bedding plane inclination angles. Well logging data was used to connect experimental lab data and field data. Compressional wave velocity was predicted with different inclination angles by stiffness parameters. The predicted compressional wave velocity for a 45-degree inclination angle showed a perfect fit with the field logging data. Steps of inverse sonic log data to stiffness parameters were shown by a flow chart. The UCS strength for 0 degrees and 45 degrees was predicted by several empirical relations using sonic logging data. The safe mud window for this special shale formation is predicted by experimental data. As shown in experimental results, our shale sample has a weak direction for both failure criteria. Well logging data and experimental data can be connected, especially by sonic log data. However, to predict shale anisotropic strength through well logging still requires more effort. The novelty of the process which connects experimental results and well logging data will be helpful for solving instability problems occurring in shale formation.

Źródło:

AGH Drilling, Oil, Gas; 2019, 36, 1; 93-112
2299-4157
2300-7052

Pojawia się w:

AGH Drilling, Oil, Gas

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 42.

Tytuł:

Charakterystyka mezoporowatych materiałów krzemionkowych typu FSM - 16

Autorzy:

Bazarnik, M.

Powiązania:

https://bibliotekanauki.pl/articles/344083.pdf

Data publikacji:

2007

Wydawca:

nakł. Maciej Pawlikowski

Tematy:

materiały krzemionkowe
silicate materials

Źródło:

Auxiliary Sciences in Archaeology, Preservation of Relics and Environmental Engineering; 2007, T. 4 spec. ed. [2]; 1-3
1689-6742

Pojawia się w:

Auxiliary Sciences in Archaeology, Preservation of Relics and Environmental Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 43.

Tytuł:

Review of the Photodecomposition of Some Important Energetic Materials

Autorzy:

Sun, Y.
Shu, Y.
Xu, T.
Shui, M.
Zhao, Z.
Gu, Y.
Wang, X.

Powiązania:

https://bibliotekanauki.pl/articles/358397.pdf

Data publikacji:

2012

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego

Tematy:

photodecomposition mechanisms
energetic materials

Opis:

The photodecomposition mechanisms of energetic materials vary with molecular structure, photodissociation wavelength, the phase of the material, experimental pressure and temperature etc. In this paper, the significant progress on photodecomposition studies of some important energetic materials achieved in recent years is introduced in detail, including nitromethane, DMNA (dimethylnitramine), TATB (1,3,5-triamino-2,4,6-trinitrobenzene), RDX (hexahydro-1,3,5-trinitro-1,3,5-triazine), HMX (1,3,5,7-tetranitro-1,3,5,7- tetrazacycloctane) and CL-20 (2,4,6,8,10,12-hexanitrohexaazaisowurtzitane). The difficulties and prospects of photodecomposition research of energetic materials are also indicated.

Źródło:

Central European Journal of Energetic Materials; 2012, 9, 4; 411-423
1733-7178

Pojawia się w:

Central European Journal of Energetic Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 44.

Tytuł:

Assesment Of Sustainability In Dismantling Station – Case Study

Autorzy:

Kosacka, M.
Golińska, P.

Powiązania:

https://bibliotekanauki.pl/articles/409314.pdf

Data publikacji:

2014

Wydawca:

Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej

Tematy:

sustainability
Dismantling
materials management

Opis:

Sustainable resources utilization is very actual issue considered in three dimensions: economic, social and environmental. Products end-of-life management is a key element of sustainable development. Automotive industry is a big supplier of different kinds of waste. End-of-life vehicles are becoming problem in most of the Member Countries. Poland is a country with one of the oldest vehicles feet in EU. It results in a growing trend of the number of old and worn cars, which need to be dismantled and recovered. The objective of this paper is to present an assessment of sustainability in disassembly station. Authors present theoretical background of research, case study description and complex analyses of dismantling process in one of the biggest dismantling stations in Poland with application of following tools: VSM maps, diagram SIPOC and RPA method. The analysis allows to identify main problems which exist in this field and to propose some improvement measures in order to improve the sustainability of dismantling operations

Źródło:

Research in Logistics & Production; 2014, 4, 2; 135-145
2083-4942
2083-4950

Pojawia się w:

Research in Logistics & Production

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 45.

Tytuł:

The study of sound and vibration isolating materials applicable environmental protection

Autorzy:

Sikora, J.
Targosz, J.

Powiązania:

https://bibliotekanauki.pl/articles/241841.pdf

Data publikacji:

2012

Wydawca:

Instytut Techniczny Wojsk Lotniczych

Tematy:

materials
acoustic insulation
vibroisolation

Opis:

Prevention of composite material, characterized by a high acoustic insulation but satisfying spread of the dynamic interactions in the environment, the sound or vibration in materials requires new solutions task of isolation between the source of noise and vibration and the environment. These new solutions based on the idea of partition (of two or multilayer), the cores of granular materials, characterized by both good characteristics vibroisolation, sound absorption and vibration-damping materials. Using these solutions brings positive results in the reduction of acoustic energy, vibration isolation and acoustic damping material provided that they are the correct selection. The paper presents results of experimental investigations of acoustic insulation properties, parameters, physic - mechanical properties of selected structural elements made of materials belonging to the latest generation of noise and vibration safe guards applicable in the work environment and external environment. The paper presents the methodology and results of new materials used in Cathedrals: Vibroacoustics and Mechanics and Robotics and Mechatronics AGH, which should be standard in the selection of the parameters of vibroacoustic properties of the newly proposed structural engineering. The work was carried out in a research project 4875/B/TO2/2010/38 financed by Ministry of Science and Higher Education and projectII.B.12 (2011-2013) "New material solutions in the design of layered Barriers vibroacoustic protection of machinery and equipment", which is one of the objectives of the multiannual program "Improving the safety and working conditions," coordinated by CIOP - PIB in Warsaw.

Źródło:

Journal of KONES; 2012, 19, 4; 555-564
1231-4005
2354-0133

Pojawia się w:

Journal of KONES

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 46.

Tytuł:

Memristors : a Short Review on Fundamentals, Structures, Materials and Applications

Autorzy:

Domaradzki, Jarosław
Wojcieszak, Damian
Kotwica, Tomasz
Mańkowska, Ewa

Powiązania:

https://bibliotekanauki.pl/articles/226873.pdf

Data publikacji:

2020

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

memristor
materials
electronics
applications

Opis:

The paper contains a short literature review on the subject of special type of thin film structures with resistive-switching memory effect. In the literature, such structures are commonly labeled as "memristors". The word "memristor" originates from two words: "memory" and "resistor". For the first time, the memristor was theoretically described in 1971 by Leon Chua as the 4th fundamental passive electronics element with a non-linear current-voltage behavior. The reported area of potential usage of memristor is enormous. It is predicted that the memristor could find application, for example in the domain of nonvolatile random access memory, flash memory, neuromorphic systems and so forth. However, in spite of the fact that plenty of papers have been published in the subject literature to date, the memristor still behaves as a "mysterious" electronic element. It seems that, one of the important reasons that such structures are not yet in practical use, is unsufficient knowledge of physical phenomena determining occurrence of the switching effect. The present paper contains a literature review of available descriptions of theoretical basis of the memristor structures, used materials, structure configurations and discussion about future prospects and limitations.

Źródło:

International Journal of Electronics and Telecommunications; 2020, 66, 2; 373-381
2300-1933

Pojawia się w:

International Journal of Electronics and Telecommunications

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 47.

Tytuł:

Mechanical properties of porous collagen/ gelatin/ hydroxyethyl cellulose matrices containing microspheres based on sodium alginate

Autorzy:

Kozlowska, J.
Tybinkowska, O.
Sionkowska, A.

Powiązania:

https://bibliotekanauki.pl/articles/284591.pdf

Data publikacji:

2018

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

polymeric materials
microspheres
cellulose

Źródło:

Engineering of Biomaterials; 2018, 21, 148; 84
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 48.

Tytuł:

Alginate/chitosan hybrid materials loaded with ciprofloxacin

Autorzy:

Kyzioł, A.
Mazgała, A.
Michna, J.
Regiel-Futyra, A.
Moreno, I.
Sebastian, V.
Irusta, S.

Powiązania:

https://bibliotekanauki.pl/articles/284972.pdf

Data publikacji:

2016

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

drugs
hybrid materials
biopolymers

Źródło:

Engineering of Biomaterials; 2016, 19, 138; 106
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 49.

Tytuł:

Structure and properties of ceramic grafting material

Autorzy:

Ulyanova, T. M.
Titova, L. V.
Evtukhov, V. L.

Powiązania:

https://bibliotekanauki.pl/articles/285020.pdf

Data publikacji:

2007

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

materiały ceramiczne
ceramic materials

Źródło:

Engineering of Biomaterials; 2007, 10, no. 63-64; 4-5
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 50.

Tytuł:

Adhesion, growth and differentiation of human osteoblast-like cells on thermally oxidized Ti and TiNb substrates

Autorzy:

Bacakova, L.
Vandrovcova, M.
Jirka, I.
Novotna, K.
Stary, V.

Powiązania:

https://bibliotekanauki.pl/articles/285115.pdf

Data publikacji:

2013

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

osteoblasts
substrates
metallic materials

Opis:

Metallic materials are essential for construction of load-bearing bone implants, such as replacements of hip, knee and other joints. For these applications, modern materials used in advanced tissue engineering, e.g. resorbable porous or fibrous polymeric and ceramic scaffolds are mechanically insufficient, even if these materials enable the ingrowth of bone cells and bone tissue formation. Therefore, searching for new metallic materials and their surface modifications improving their biocompatibility and osseointegration is still desirable. As first metallic materials for bone implantation, AISI 316L stainless steel and Co-Cr alloys were used. In the 1950’s, the Ti-6Al-4V alloy was developed. These materials are still frequently used for construction of implants because of their relatively low price [1]. However, these materials are biomechanically incompatible with the bone tissue, because their Young’s modulus is markedly higher (110-220 GPa) than that of the bone (10-40 GPa). Implants with high stiffness take over a considerable part of load from the bone. This phenomenon, referred as “stress-shielding effect”, can then cause the bone resorption and loosening of the implant [1]. Also chemical compositions of the mentioned metallic materials limit their biocompatibility, because they contain harmful elements as V, Al, Co and Cr, which can act as cytotoxic, catabolic, immunogenic or even carcinogenic agents [2,3], and can also cause serious neurological problems [4]. Due to these adverse reactions, new types of Ti-alloys have been developed, namely low-rigidity β-type Ti alloys, containing non-toxic and non-allergenic elements (Nb, Ta, Zr etc.) and having good mechanical properties and workability [4,5]. The goal of this study was to evaluate the adhesion, growth and differentiation of osteoblast-like MG-63 and Saos-2 cells on titanium-niobium alloys after their surface modification by thermal oxidation at two different temperatures (165°C and 600°C). Pure titanium (treated at 165°C and 600°C) and polystyrene culture dishes (PS) were used as control materials. Possible immune activation of the cells was tested by the levels of TNF-alpha secreted to the cell culture media by murine macrophage-like RAW 264.7 cells cultured on the tested materials. On samples treated at 165°C, the number of initially adhered MG-63 and Saos-2 cells was on an average higher on TiNb than on Ti or PS. On day 3 after seeding, the trend of the cell numbers remained similar, with the highest cell density found on TiNb. Similar results were obtained on samples treated at 600°C, where the difference in cell number between TiNb and Ti samples became more apparent. This cell behavior could be attributed to a less negative zeta potential on TiNb samples. In samples treated at 165°C, the zeta potential of TiNb surfaces was on the average less negative than on Ti surfaces, but this difference was not significant. However, in samples treated at 600°C, this difference became much more pronounced, which was probably due to the formation of T-Nb2O5 phase on the surface of the TiNb samples. This phase was of a crystalline structure, while at 165°C, the structure of Nb2O5 was amorphous. In addition, both Ti and TiNb samples treated at 600°C contained rutile, while the samples treated at 165°C contained anatase in their surface layer. It has been shown that rutile films deposited on PEEK enhanced the adhesion and growth of osteoblasts more than anatase films [6]. This phenomenon was explained by an increase in the material surface wettability, and particularly to the presence of –OH- groups on the rutile films. The expression of collagen I and osteocalcin, i.e. an early and late marker of osteogenic cell differentiation, respectively, was higher on Ti than on TiNb samples, and this difference was more apparent in samples treated at 165°C. At the same time, no considerable immune activation of the cells on all tested samples was found. The production of TNF-α by RAW 264.7 cells was very low in comparison with cells grown in the presence of bacterial lipopolysaccharide, and also significantly lower than on untreated samples. These results indicate that TiNb substrates increased the proliferation of human bone cells, while pure Ti rather supported the cell differentiation. The effect on cell proliferation was more apparent in samples treated at the higher temperature (600°C), while the effect on cell differentiation was more pronounced at the lower temperature (165°C). None of the tested samples induce significant cell proinflammatory activation. Thus, all tested samples are suitable as carriers for bone cells; only an appropriate application (i.e., requiring either proliferation or quick differentiation of osteogenic cells) should be selected.

Źródło:

Engineering of Biomaterials; 2013, 16, no. 122-123 spec. iss.; 75-76
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 51.

Tytuł:

Porous hybrid materials as potential drug delivery systems

Autorzy:

Pajchel, Ł.
Szulkowska, A.
Kolmas, J.

Powiązania:

https://bibliotekanauki.pl/articles/283765.pdf

Data publikacji:

2018

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

hybrid materials
drugs
composites

Źródło:

Engineering of Biomaterials; 2018, 21, 148; 43
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 52.

Tytuł:

Combinatorial discovery approaches accelerate the development of bioresorbable medical implants

Autorzy:

Kohn, J.

Powiązania:

https://bibliotekanauki.pl/articles/283833.pdf

Data publikacji:

2009

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

bioresorbable materials
development
CCM

Źródło:

Engineering of Biomaterials; 2009, 12, no. 89-91; 259-260
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 53.

Tytuł:

Synthesis and structural characterization of the biodegradable polyester/bisphosphonate conjugates for coating of the apatite materials

Autorzy:

Oledzka, E.
Pachowska, D.
Orłowska, K.
Sobczak, M.
Kolmas, J.
Nałęcz-Jawecki, G.

Powiązania:

https://bibliotekanauki.pl/articles/283941.pdf

Data publikacji:

2016

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

biodegradable materials
coatings
biomaterials

Źródło:

Engineering of Biomaterials; 2016, 19, 138; 47
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 54.

Tytuł:

Design and operational diagnostics of marine propellers made of polymer materials

Autorzy:

Kluczyk, Marcin
Grządziela, Andrzej
Batur, Tomislav

Powiązania:

https://bibliotekanauki.pl/articles/32898214.pdf

Data publikacji:

2022

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

diagnostics
polymeric materials
propellers

Opis:

There has been a rapidly growing interest in the use of composite and polymer materials for the construction of marine propellers for over 20 years. The main advantages of these materials are a reduction in the weight of the propeller, increased efficiency due to the hydroelasticity effect, a reduction of the hydroacoustic signature, and a cost reduction for serial production. This paper presents an overview of diagnostic methods that can be applied at the design level and during the operation of marine propellers made of polymeric materials. Non-invasive contact and non-contact-based diagnostic techniques for evaluating the technical state of the propeller are reviewed, and the advantages and disadvantages of qualitative and quantitative methods are identified. Operational diagnostic procedures for propellers are areessential for the safety of vessels at sea. Finally, the structure of a diagnostic system is proposed. It combined diagnosis process with the genesis of damage and the prognosis of the technical condition, i.e. production and in-service diagnostics.

Źródło:

Polish Maritime Research; 2022, 4; 115-122
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 55.

Tytuł:

Effective removal of odors from air with polymer nonwoven structures doped by porous materials to use in respiratory protective devices

Autorzy:

Brochocka, Agnieszka
Nowak, Aleksandra
Panek, Rafał
Kozikowski, Paweł
Franus, Wojciech

Powiązania:

https://bibliotekanauki.pl/articles/1845379.pdf

Data publikacji:

2021

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

activated carbon
zeolites
porous materials
polymer nonwoven structures
mesoporous silica materials
aplication

Opis:

Filtering Respiratory Protective Devices (FRPD) is not typically evaluated for exposure to volatile compounds, even though they significantly affect their protective performance. Such compounds are released into the atmosphere by industrial processes and pose serious health risks in people inhaling them. The adsorbent materials currently used to prevent those risks include activated carbon (AC). Zeolites and mesoporous silica materials (MCM) are very popular among the sorption materials. Due to their physical and chemical properties, they are able to adsorb significant amounts of volatile compounds from air. The melt-blown technology was used to produce filtering nonwovens with modifiers. As a result, polymer nonwoven structures with modifiers in the form of AC, zeolite (NaP1 type), molecular sieves (SM, SM 4Å) and mesoporous silica materials (MCM-41) were produced. The use of ACs (AC1 from Zgoda and AC2 from Pleisch) and their mixtures with others modifiers allowed to obtain satisfactory sorption, protective and utility properties. The longest breakthrough time against cyclohexane (approx. 53 min) was afforded by a variant containing AC, against ammonia (approx. 12 min) for the variant with AC2 and a mixture of AC2 and MCM-41. In the case of acetone vapor satisfactory breakthrough times were found for the variants with AC2 and AC1+SM (~20–25 min.). The present work deals with scientific research to improve workers’ and society’s health and safety by pursuing a better working life, and creating a safe social environment.

Źródło:

Archives of Environmental Protection; 2021, 47, 2; 3-19
2083-4772
2083-4810

Pojawia się w:

Archives of Environmental Protection

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 56.

Tytuł:

Electrical properties of Ag-C and Cu-C contact materials
Właściwości elektryczne materiałów stykowych Ag-C i Cu-C

Autorzy:

Pietrzak, K.
Gładki, A.
Frydman, K.
Wójcik-Grzybek, D.
Kaszyca, K.
Borkowski, P.

Powiązania:

https://bibliotekanauki.pl/articles/192431.pdf

Data publikacji:

2016

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Technologii Materiałów Elektronicznych

Tematy:

contact materials
composite materials
graphene form
materiały stykowe
materiały kompozytowe
formy grafenowe

Opis:

Industrial production of various forms of carbon, including graphene, nanotubes, and fullerenes, expanded the range of composite materials for which they constitute the reinforcing phase of metallic matrices. It was expected that the graphene form (GF) reinforcing phase would improve the electrical, thermal, and mechanical properties of such composites. Composites with Cu and Ag matrices, having a wide range of applications in micro- and optoelectronics, aerospace and automotive industries, proved to be particularly promising. A specific group of these composites is used in a variety of electrical circuits for electrical switches, contactors, circuit breakers, voltage regulators, and arcing tips. Among others, this group includes composites such as Ag-W, Ag-WC, Ag-WC-C, or Cu-W. The presented results of electrical tests performed for the Cu (Ag) /GF composites extend the number of properties of materials used in air and vacuum electrical contacts.
Przemysłowe otrzymywanie rozmaitych form węgla – grafenu, nanorurek, fulerenów – rozszerzyło gamę materiałów kompozytowych, w których stanowią one fazę wzmacniającą matryc metalicznych. Oczekiwano, że grafenowa faza wzmacniająca polepszy cechy elektryczne, cieplne i wytrzymałościowe takich kompozytów. Szczególnie obiecującymi są kompozyty z matrycami Cu lub Ag znajdujące zastosowania w mikroelektronice i optoelektronice, przemysłach lotniczym i samochodowym. Specyficzna grupa tych kompozytów stosowana jest w rozmaitych elementach układów elektrycznych jako wyłączniki etc. Do grupy tej należą między innymi kompozyty Ag-W; Ag-WC, Ag-WC-C lub Cu-W. Prezentowane wyniki badań elektrycznych kompozytów Cu(Ag)/GF poszerzają zbiór właściwości materiałów stosowanych w powietrznych i próżniowych stykach elektrycznych.

Źródło:

Materiały Elektroniczne; 2016, T. 44, nr 2, 2; 4-10
0209-0058

Pojawia się w:

Materiały Elektroniczne

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 57.

Tytuł:

Swift ion beams for solid state and materials science

Autorzy:

Denker, A.
Bohne, W.
Heese, J.
Homeyer, H.
Kluge, H.
Lindner, S.
Opitz-Coutureau, J.
Röhrich, J.
Strub, E.

Powiązania:

https://bibliotekanauki.pl/articles/146161.pdf

Data publikacji:

2003

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

tumour therapy
materials modification
materials analysis
single event effects
technical applications
cyclotrons

Opis:

Ion beams are unique tools in modern science and technology. They are used for the analysis and modification of materials and are applied in medicine and technology. In cancer therapy fast protons allow a precise tailoring of the radiation field to the tumour, thus maximising the tumour control probability and simultaneously reducing the risk of side effects. Modification of the structure of solids by ion irradiation results in local structures on nano-scale, e.g. high-tech filters having defined pore numbers and pore sizes are produced by high-energy heavy ion irradiation with consecutive etching. Electronic devices utilised in areas with high radiation level have to be tested for their radiation hardness. The devices are irradiated with accelerated ions to receive the same dose by high-energy ions as expected during their lifetime. For materials sciences the analysis of composition and structure of solids is of uppermost importance. Complex layered structures are analysed by ERDA (Elastic Recoil Detection Analysis). Investigation of art and archaeological objects has to be non-destructive. PIXE (Proton Induced X-ray Emission) allows elemental analysis without sampling of the object. Different applications of high energy ions will be presented.

Źródło:

Nukleonika; 2003, 48,suppl.2; 175-180
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 58.

Tytuł:

Surowce odnawialne jako alternatywa do otrzymania biodegradowalnych tworzyw
Renewable raw materials as an alternative to receiving biodegradable materials

Autorzy:

Folentarska, A.
Krystyjan, M.
Baranowska, H. M.
Ciesielski, W.

Powiązania:

https://bibliotekanauki.pl/articles/410310.pdf

Data publikacji:

2016

Wydawca:

Uniwersytet Humanistyczno-Przyrodniczy im. Jana Długosza w Częstochowie. Wydawnictwo Uczelniane

Tematy:

naturalne surowce
surowce odnawialne
skrobia
kompleksy polimerowe
tworzywa biodegradowalne
natural raw materials
renewable raw materials
starch
polymer complexes
biodegradable materials

Opis:

Artykuł stanowi przegląd literaturowy dotyczący surowców naturalnych, odnawialnych, takich jak polisacharydy, białka, tłuszcze, mogących posłużyć jako alternatywa do otrzymania biodegradowalnych materiałów. Omówiono właściwości skrobi jako polisacharydu będącego surowcem biodegradowalnym i pozyskiwanym ze źródeł odnawialnych. Opisano kompleksy polimerowe oparte na skrobi jako przyszłościowe tworzywa biodegradowalne wykorzystywane w różnych dziedzinach przemysłu.
The article is a review of the literature concerning natural and renewable raw materials, such as polysaccharides, proteins, fats, which can be used as an alternative to obtain biodegradable materials. Properties of the starch as a polysaccharide which is a raw biodegradable material harvested from renewable resources were discussed. Polymer complexes based on the starch in the various systems as future biodegradable materials used in various industries were described.

Źródło:

Chemistry, Environment, Biotechnology; 2016, 19; 121-124
2083-7097

Pojawia się w:

Chemistry, Environment, Biotechnology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 59.

Tytuł:

Recykling jako potencjalne źródło pozyskiwania surowców mineralnych z wybranych grup odpadów
Recycling as a potential source for mineral raw materials with selected groups of waste

Autorzy:

Pietrzyk-Sokulska, E.

Powiązania:

https://bibliotekanauki.pl/articles/393998.pdf

Data publikacji:

2016

Wydawca:

Polska Akademia Nauk. Instytut Gospodarki Surowcami Mineralnymi i Energią PAN

Tematy:

recykling
wybrane odpady
surowce mineralne
odzysk surowców
recycling
raw materials
materials recovery

Opis:

Oszczędne gospodarowanie zasobami jest jednym z rozwiązań problemów środowiskowych, a także wyzwań gospodarczych Europy. Wymaga to jednak rezygnacji z gospodarki linearnej bazującej na modelu „produkcja – zużycie – wyrzucenie” i zastąpieniu jej gospodarką o obiegu zamkniętym, w którym odpady są bazą różnych surowców, w tym mineralnych. Oszczędne wykorzystywanie surowców może przynieść znaczne oszczędności i przyczynić się do redukcji emisji gazów cieplarnianych i innych emisji, (w tym również do wód i gleb). W związku z tym w gospodarce materiałowej coraz większe znaczenie mają surowce i materiały pochodzące z odzysku (tzw. wtórne), np. metale, kauczuk, drewno, papier, szkło itp. Tendencje obserwowane w krajach uprzemysłowionych wskazują, że odzysk niektórych surowców z odpadów jest na poziomie 40–50%. Ma to związek z coraz lepszym systemem sortowania odpadów i konsekwentną polityką preferującą ich wykorzystywanie. W Polsce również coraz większe znaczenie przywiązuje się do wykorzystania surowców wtórnych, zarówno z procesów produkcyjnych, jak też ze skupu. Wymuszają to z jednej strony obowiązujące i zaostrzane przepisy ochrony środowiska, a z drugiej względy ekonomiczne. Dotyczy to m.in. złomu i odpadów stalowych, metali nieżelaznych (miedzi, aluminium, ołowiu, cynku i cyny) oraz odpadów elektrycznych i elektronicznych (ZSEE), baterii i akumulatorów, a także wycofanych pojazdów samochodowych. Często odzysk surowców wtórnych z odpadów jest mniej energochłonny niż ze źródeł pierwotnych, a tym samym prośrodowiskowy (mniejsza emisja zanieczyszczeń) i efektywny ekonomicznie. W artykule skupiono się na recyklingu ZSEE, baterii i akumulatorów oraz wycofanych z eksploatacji pojazdów, jako potencjalnym źródle wtórnych surowców mineralnych ważnych dla rozwoju innowacyjnych sektorów polskiej gospodarki.
Effective resource management is one of the solutions to environmental issues and to economic challenges of Europe. However, it requires abandoning a linear economy that is based on the “take-make-waste” approach and replacing it with a “closed-loop economy” in which waste becomes a base for different raw materials, including minerals. Effective use of raw materials may bring significant savings and may contribute to reduction of greenhouse gases and other emissions (including also emission to pater and soil). Therefore, in raw materials economy, resources and materials from recycling (so-called secondary) e.g. metals, rubber, wood, paper, glass etc. are becoming more and more important. The trends observed in industrial countries indicate that the recycling of some raw materials from waste is at the level of 40–50%. This is linked with a bigger and better system of sorting waste and consistent politics that prefer their use. In Poland, more and more attention is also placed on the use of waste, both originating from production processes as well as these from collection points. This is forced, on the one hand, by existing and tightened environment protection laws, and by economic reasons on the other hand. Such a situation is relevant in cases including scrap and steel waste, non-ferrous metals (copper, aluminum, lead, zinc and tin) and Waste Electrical and Electronic Equipment (WEEE), batteries and end-of-life vehicles. Frequently, the recovery of recyclable materials from waste is less energy consuming than from primary sources and therefore, it is environmentally friendly (lower emissions of pollutants) and efficient from the economic point of view. The paper presents recycling of WEEE, batteries and accumulators and end-of-life vehicles as sources of recyclable mineral materials important for the further development of modern industry.

Źródło:

Zeszyty Naukowe Instytutu Gospodarki Surowcami Mineralnymi i Energią PAN; 2016, 92; 141-161
2080-0819

Pojawia się w:

Zeszyty Naukowe Instytutu Gospodarki Surowcami Mineralnymi i Energią PAN

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 60.

Tytuł:

Surowce mineralne deficytowe dla polskiej gospodarki : propozycja nowego podejścia do surowców strategicznych i krytycznych
Scarce mineral commodities for the Polish economy : a new proposal for approach to strategic and critical mineral commodities

Autorzy:

Mazurek, Sławomir
Roszkowska-Remin, Joanna
Szamałek, Krzysztof
Tymiński, Marcin
Malon, Agnieszka

Powiązania:

https://bibliotekanauki.pl/articles/2076180.pdf

Data publikacji:

2021

Wydawca:

Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy

Tematy:

deficyt surowców mineralnych
krytyczne surowce mineralne
strategiczne surowce mineralne
mineral raw materials deficit
critical mineral raw materials
strategic mineral raw materials

Opis:

The Authors analyze the national deficit of mineral commodities (classified as strategic and critical mineral commodities) against the volume of mineral deposits in Poland, from which these commodities are obtained. The assignment of types and subtypes of minerals that are the source of extraction to the corresponding strategic and critical mineral commodities is presented. A comparison was made between the annual extraction of minerals-sources of mineral commodities and their reserves in documented deposits and the volume of exports and imports of strategic and critical mineral commodities. It was found that Poland does not have a number of mineral deposits useful as sources of mineral commodities (strategic and critical) or documented mineral reserves are not sufficient to cover the needs of the national economy for these mineral commodities. Therefore, most of the critical and strategic mineral raw materials are scarce for Poland. A new approach to the classification of critical and strategic mineral commodities and the definition of the scarcity of mineral commodities in the country was proposed. The task of the geological survey is to conduct research to increase the base of mineral resources, especially those of fundamental importance for the economy. Such works are carried out at the Polish Geological Institute for the benefit of the project of State Raw Materials Policy (still under consideration) and should be continued in subsequent years.

Źródło:

Przegląd Geologiczny; 2021, 69, 5; 273--286
0033-2151

Pojawia się w:

Przegląd Geologiczny

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 61.

Tytuł:

Odporność materiałów ochronnych na substancje chemiczne - metodyka badania
Resistance of protective materials to chemical substances - research methodology

Autorzy:

Krzemińska, S.

Powiązania:

https://bibliotekanauki.pl/articles/181383.pdf

Data publikacji:

2011

Wydawca:

Centralny Instytut Ochrony Pracy

Tematy:

materiały ochronne
odzież ochronna
odporność materiałów ochronnych
protective materials
barrier materials
protective clothing

Opis:

W artykule przedstawiono wymagania stawiane materiałom barierowym stosowanym do wytwarzania odzieży, obuwia i rękawic ochronnych na przenikanie substancji chemicznych. Zwrócono uwagę na zachowanie właściwości ochronnych materiałów w warunkach kontaktu wielokrotnego, symulującego w większym stopniu warunki narażenia na chemikalia.
This paper presents the requirements for barrier materials used in the production of clothing, gloves and boots protecting against permeation by chemical substances. It also discusses the problem of protective materials maintaining their properties under multiple contact conditions, which simulate exposure to chemicals more accurately.

Źródło:

Bezpieczeństwo Pracy : nauka i praktyka; 2011, 7/8; 32-34
0137-7043

Pojawia się w:

Bezpieczeństwo Pracy : nauka i praktyka

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 62.

Tytuł:

Polityka Surowcowa Państwa 2050 - realizacja założeń uchwały Rady Ministrów
State Raw Materials Policy 2050 - implementation of the Council of Ministers’resolution

Autorzy:

Dziadzio, Piotr S.

Powiązania:

https://bibliotekanauki.pl/articles/20044475.pdf

Data publikacji:

2022

Wydawca:

Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy

Tematy:

Polityka Surowcowa Państwa 2050
bezpieczeństwo surowcowe
dostęp do surowców
State Raw Materials Policy 2050
raw materials security
access to raw materials

Opis:

Free, unrestricted access to raw materials is fundamental to the proper functioning of any economy. It should be in the interest of every country to ensure access to raw materials that are needed in the present but will also be needed in the future, particularly taking into account economic, social and also political changes that are taking place or are possible, with different dynamics. In order to meet such needs, it is necessary to have a strategy indicating concrete actions whose implementation will achieve the goal of ensuring raw material security, even in the decades to come. State Raw Materials Policy 2050 (PSP2050), adopted on March 1, 2022, is a very important document, not only from the point of view of the country’s raw materials security, but also for ensuring the country’s energy security. The document describes the actions to be taken for raw material security and considers the concrete implementation work already done. Simultaneously with the work on PSP2050, other activities were being prepared and executed, including legislation to enable its effective implementation.

Źródło:

Przegląd Geologiczny; 2022, 70, 8; 563-565
0033-2151

Pojawia się w:

Przegląd Geologiczny

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 63.

Tytuł:

Surowce mineralne
Mineral Resources

Autorzy:

Zieliński, S.

Powiązania:

https://bibliotekanauki.pl/articles/142345.pdf

Data publikacji:

2014

Wydawca:

Stowarzyszenie Inżynierów i Techników Przemysłu Chemicznego. Zakład Wydawniczy CHEMPRESS-SITPChem

Tematy:

surowce mineralne
Raw Materials Initiative
surowce nieenergetyczne
Mineral Resources
non-energy raw materials

Opis:

Gwałtowny rozwój społeczno-gospodarczy w XX w. został osiągnięty nie tylko dzięki postępom w nauce i technologii, lecz także niespotykanemu wcześniej zużyciu surowców. Problem dostaw surowców znalazł się więc w centrum uwagi ekip rządowych i środowisk przemysłowych. O ile jednak dyskusja o przyszłości surowcowej świata dotychczas koncentrowała się na surowcach energetycznych i organicznych (biomasie), to surowcom nieenergetycznym, takim jak minerały i metale, nie poświęcano równej uwagi. Sytuacja uległa zmianie dopiero w ostatnich kilkunastu latach, gdy uświadomiono sobie, że bez surowców mineralnych społeczeństwa uprzemysłowione i współczesne technologie byłyby niewyobrażalne. W tej sytuacji rodzi się obawa, czy rosnące zapotrzebowanie nie grozi wyczerpaniem zasobów i niedoborem surowców w najbliższej przyszłości. Niedobór surowców mineralnych jest szczególnie niepokojącym problem dla Unii Europejskiej, która jako całość jest wysoce zależna od importu minerałów metalicznych i metali potrzebnych w produkcjach high-tech. Komisja Europejska uruchomiła w 2008 r. program „Raw Materials Initiative”, który ustala zintegrowaną strategię w odpowiedzi na różne wyzwania wiążące się z dostępem do nienergetycznych surowców. W ramach strategii wytypowano surowce o wysokiej krytyczności zarówno z uwagi na ich znaczenie gospodarcze jak i ryzyko dostaw.
The rapid socio-economic development in the twentieth century has been achieved not only through progress in science and technology, but also the never before seen consumption of raw materials. The problem of raw materials supply found itself in the spotlight of government teams and industrial environments. However, while the debate about the future of the world’s raw materials focused so far on energy raw materials and organic ones (biomass), non-energy raw materials, such as minerals and metals, did not receive equal attention. The situation changed only in the last dozen years, when it was realized, that without mineral resources, industrialized society and modern technologies would be unimaginable. Such a situation raises a concern that the growing demand does not threaten with resource depletion and deficiency of raw materials in the near future. Mineral resources deficiency is a particularly worrying problem for the European Union, which as a whole is highly dependent on imports of metallic minerals and metals necessary in high-tech productions. In 2008 The European Commission launched the „Raw Materials Initiative” program, which sets out an integrated strategy in response to various challenges in access to non-energy raw materials. As part of the strategy, raw materials of high criticality were selected, because of their economic importance as well as their supply risk.

Źródło:

Chemik; 2014, 68, 5; 429-446
0009-2886

Pojawia się w:

Chemik

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 64.

Tytuł:

Effects of Range and Mode on Lifting Capability and Lifting Time

Autorzy:

Lee, T. H.

Powiązania:

https://bibliotekanauki.pl/articles/90247.pdf

Data publikacji:

2012

Wydawca:

Centralny Instytut Ochrony Pracy

Tematy:

lifting
strength
manual materials handling

Opis:

This study examined the effects of 3 lifting ranges and 3 lifting modes on maximum lifting capability and total lifting time. The results demonstrated that the maximum lifting capability for FK (from floor to knuckle height)was greater than that for KS (from knuckle height to shoulder height) or FS (from floor to shoulder height. Additionally, asymmetric lifting with initial trunk rotation decreased maximum lifting capability compared with symmetric lifting or asymmetric lifting with final trunk rotation. The difference in total lifting time between KS and FS was not significant, while FK increased total lifting time by ~20% compared with FS even though the travel distance was 50% shorter.

Źródło:

International Journal of Occupational Safety and Ergonomics; 2012, 18, 3; 387-391
1080-3548

Pojawia się w:

International Journal of Occupational Safety and Ergonomics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 65.

Tytuł:

Investigations of applications of smart materials and methods in fluid valves and drives

Autorzy:

Milecki, Andrzej
Rybarczyk, Dominik

Powiązania:

https://bibliotekanauki.pl/articles/100208.pdf

Data publikacji:

2019

Wydawca:

Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych

Tematy:

electrohydraulics
valve
drive
smart materials

Opis:

In the paper the investigations performed at the Division of Mechtronic Devices at Poznan University of Technology in the area of application of both: smart materials in electro-hydraulic and electro-pneumatic valves, and new methods to control of hydraulic servo drives, are presented. In a first part the piezo bender actuator is shortly described and its application in servo valve is proposed. This actuator replaced the torque motor in the available on the market servo valve. The new valve simulation model is proposed. The simulation and investigations results of the servo valve with the piezo bending actuator are included. In the next part of the paper the application of piezo tube actuator in flapper-nozzle pneumatic valve is described. The test stand and investigations results are presented. Later, in the article, the Model Following Control (MFC) and Fractional order Control (FoC) methods are described. Their application in control of electrohydraulic servo drive is proposed. Some investigations results are included in the paper, showing the advantages of those control methods.

Źródło:

Journal of Machine Engineering; 2019, 19, 4; 122-134
1895-7595
2391-8071

Pojawia się w:

Journal of Machine Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 66.

Tytuł:

Higher order reversal curves in some hysteresis models

Autorzy:

Chwastek, K.

Powiązania:

https://bibliotekanauki.pl/articles/140836.pdf

Data publikacji:

2012

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

soft magnetic materials
hysteresis
modelling

Opis:

Some physical concepts important for a hysteresis model (effective field, anhysteretic magnetization) are discussed on the example of Jiles-Atherton model. The Jiles-Atherton model reveals some drawbacks, which make this model more difficult to be applied in electrical engineering. In particular, it does not describe accurately the magnetization curves after a reversal, moreover complex magnetization cycles are poorly represented. On the other hand, the phenomenological description proposed by Takács seems to be a valuable alternative to the Jiles-Atherton formalism. The concept of effective field may be easily incorporated in the description.

Źródło:

Archives of Electrical Engineering; 2012, 61, 4; 455-470
1427-4221
2300-2506

Pojawia się w:

Archives of Electrical Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 67.

Tytuł:

Regional Analysis of Raw Plant Material Production and Primary Processing in Poland
Analiza regionalna produkcji surowców roślinnych i ich pierwotnego przetwórstwa w Polsce

Autorzy:

Czubak, Wawrzyniec

Powiązania:

https://bibliotekanauki.pl/articles/2033454.pdf

Data publikacji:

2004-12-31

Wydawca:

Uniwersytet Przyrodniczy w Poznaniu. Wydawnictwo Uczelniane

Tematy:

Regional analysis
Raw plant materials

Opis:

Although there are no rapid changes in the agrarian structure there is an ongoing progress in the production structures in the Polish agriculture. The regional diagnosis of raw material production and its processing can be the key factor of rising competitiveness of various regions, as well as for processing branches. The aim of this paper is to show the present situation of the Polish food industry and regional adjustment between the raw plant material production and its primary processing in Poland.
Badanie struktury przestrzennej rolnictwa tworzy podstawę oceny stopnia dostosowania profilu produkcji rolniczej, zwłaszcza roślinnej, do istniejących w danym rejonie możliwości przetwarzania surowców roślinnych. Głównym celem badań była regionalna diagnoza produkcji rolniczych surowców roślinnych i ich przetwarzania. Podstawowym materiałem analizy były niepublikowane dane Głównego Urzędu Statystycznego w Warszawie. Produkcja roślinna stanowi ważny dział rolnictwa. Najwięcej produkcji globalnej rolnictwa i produkcji globalnej roślinnej jest wytwarzane w pasie środkowej Polski (z wyłączeniem województwa lubuskiego). Z tej części kraju pochodzi także znaczna część towarowej produkcji roślinnej. Regionalne zróżnicowanie produkcji roślinnej istnieje również w odniesieniu do tej wielkości produkcji, która trafia do przemysłu spożywczego. W ujęciu regionalnym wartość przetworzonych surowców roślinnych potwierdza dominację rejonów środkowej części kraju, zwłaszcza województw mazowieckiego, wielkopolskiego, kujawsko-pomorskiego i lubelskiego. Łączna wartość produkcji roślinnej przeznaczonej dla przemysłu rolno-spożywczego w tych województwach przekracza połowę wartości produkcji dla całego kraju. Z kolei przetwórstwo rolno-spożywcze odgrywa dużą rolę w przetwórstwie przemysłowym ogółem, przy czym przetwarzanie surowców rolniczych nie jest geograficznie jednolite. W Polsce w 2000 roku było niemal 7 tys. podmiotów przetwórstwa artykułów spożywczych i napojów i było to 23% podmiotów przetwórstwa ogółem działających w kraju. W ujęciu przestrzennym przemysł spożywczy miał największe znaczenie w województwach: mazowieckim, wielkopolskim i śląskim, gdzie jest zlokalizowanych około ⅓ wszystkich podmiotów, zatrudniających znaczną część pracujących w przedsiębiorstwach produkcji artykułów spożywczych i napojów. Przedsiębiorstwa zlokalizowane w tych województwach wytwarzają niemal połowę wartości produkcji sprzedanej artykułów spożywczych i napojów. Wzrost gospodarczy w Polsce przejawiał się we wzroście większości wskaźników makroekonomicznych. Rosła produkcja globalna, która - podobnie jak produkt krajowy brutto i wartość dodana brutto - potroiła swoją wartość w cenach bieżących. Tendencje te były zbieżne z wynikami zarówno rolnictwa, jak i przemysłu spożywczego, przy czym dynamika wzrostu rolnictwa była mniejsza aniżeli przemysłu. Udział rolnictwa w tworzeniu produkcji globalnej i wartości dodanej brutto gospodarki kraju systematycznie się zmniejszał. Odwzorowaniem zmian relacji sektora przemysłu spożywczego i rolnego jest wzajemny stosunek wytwarzanej wartości dodanej brutto. Wykazuje on poprawę relacji na korzyść przemysłu i wskazuje na stały wzrost znaczenia przemysłu spożywczego w wartości wytwarzanej żywności i w gospodarce kraju. 

Źródło:

Journal of Agribusiness and Rural Development; 2004, 3, 359; 31-45
1899-5241

Pojawia się w:

Journal of Agribusiness and Rural Development

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 68.

Tytuł:

Polymeric materials – selected standards and biological research methods

Autorzy:

Agnieszka Richert, Agnieszka Richert

Powiązania:

https://bibliotekanauki.pl/articles/1179539.pdf

Data publikacji:

2017

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

biocide
biofilm
mutagenicity
polymer materials

Opis:

The purpose of this paper is to present the standards and the research methods enabling biological examination of polymeric materials or active packaging. These procedures apply to polymeric materials containing additives such as bactericides and fungicides.

Źródło:

World Scientific News; 2017, 76; 166-172
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 69.

Tytuł:

Electron work function as a direct parameter for bacterial infection risk of implant surfaces

Autorzy:

Gołda-Cępa, M.
Syrek, K.
Brzychczy-Włoch, M.
Sulka, G. D.
Kotarba, A.

Powiązania:

https://bibliotekanauki.pl/articles/284984.pdf

Data publikacji:

2016

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

bacterial infections
implants
nanoporous materials

Źródło:

Engineering of Biomaterials; 2016, 19, 138; 58
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 70.

Tytuł:

The influence of the degradation process on the PLA/TCP locking bolt thread strength as a part of intramedullary locking nail system

Autorzy:

Gryń, K.
Szaraniec, B.
Ziąbka, M.
Morawska-Chochół, A.
Chłopek, J.

Powiązania:

https://bibliotekanauki.pl/articles/285252.pdf

Data publikacji:

2012

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

degradation
intramedullary nailing
bioresorbable materials

Opis:

Intramedullary nailing has received increased attention for the treatment of distal femoral fractures. There are many types of nailing systems commonly used. Among them there is locked intramedullary nailing, which combines closed nailing with a special locking piece (bolt), which expands distal part of a nail and anchoring it when a central screw is tightened. Compared to other interlocking nail systems it is very effective and not so invasive way of fractured long bone treatment. However, it is not perfect and has one major disadvantage related to material (metal) and necessity of removing all parts of the system after the bone is recovered. The biggest issue is connected with the locking piece removal. That is why there was a need to find a material for this piece which is biodegradable and strong enough to maintain its mechanical function at the same time. Poly-L-lactide (PLA) is nowadays one of the most used bioabsorbable materials. Unfortunately, this polymer may not meet some application requirements due to inadequate mechanical properties and its degradation characteristics. One of the easiest ways to overcome these obstacles is to introduce an inorganic phase into the polymer matrix to create a composite. In this article a production method of a biodegradable composite (PLA/TCP, 90/10) locking piece of an interlocking intramedullary nail called "OLIVE" and the influence of degradation process in simulated physiological conditions (H2O, PBS) on its mechanical properties is shown. Main stress was placed on the inner thread strength to discover how it changes with time. A special device for mechanical testing machine imitating working conditions was fabricated. 148 Based on SEM observations, pH and electric conductivity monitoring after 14 days no degradation was found. However, mechanical testing shown, that after incubation for such period of time the material was more ductile. Instead of cracking, what was observed for not incubated samples, they changed their shape during the testing process. Nevertheless, it didn't radically influence on the inner thread strength and didn't change mechanical function of the olive. No inner thread destruction was discovered contrary to a metallic screws which in all cases were broken. Preliminary results indicate that proposed composite and an implant made of this material might be used as a locking piece in a locked intramedullary nailing system.

Źródło:

Engineering of Biomaterials; 2012, 15, no. 116-117 spec. iss.; 148
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 71.

Tytuł:

Potential activation of the immune system on metallic materials for bone implants

Autorzy:

Stranavova, L.
Bacakova, M.
Novotna, K.
Bacakova, L.
Fencl, J.

Powiązania:

https://bibliotekanauki.pl/articles/285314.pdf

Data publikacji:

2012

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

bone implants
metallic materials
biomaterials

Opis:

Titanium and stainless steel are metallic materials that have been in use for a long time in orthopedics, traumatology and stomatology. These metals are strong, corrosion-resistant and biocompatible. However, metallic materials have some disadvantages in comparison with the natural bone, particularly their relatively high specific weight and toughness. For example, the Young's modulus of AISI316L stainless steel, Co-Cr alloys and Ti-6Al-4V alloy, i.e. materials frequently used for implantation into bone, ranges between 110-220 GPa, while the Young's modulus of bone tissue is 10-40 GPa [1]. In addition, these metals can release cytotoxic, allergenic and immunogenic ions, which can affect their biocompatibility [2, 3]. Implantation is a special type of transplantation process, in which the implant is inserted into the body, usually in order to replace an irreversibly damaged tissue. However, the immune system recognizes the implant as a foreign substance and attacks it with its effector mechanisms. Just as it can reject other types of transplants, the immune system can reject an artificial implant. To prevent rejection of an implant, it is important to study the potential activation of the immune system. This study has investigated the biocompatibility of samples made of pure titanium (according to quality standard ISO 5832-2) and corrosion-resistant steel (quality standards ISO 5832-1 and AISI 316L), obtained from Beznoska Ltd. (Kladno, Czech Republic), and the potential activation of the immune system by these materials. In addition to Fe, the steel samples contained C (max. 0.025 wt.%), Si (0.6 wt.%), Mn (1.7 wt.%), P (max. 0.025wt.%), S (max. 0.003 wt.%), Cr (17.5 wt.%), Ni (13.5 wt.%), Mo (2.8 wt.%), and Cu (max. 0.1 wt. %). The materials were used in the form of square samples (9x9 mm or 30x30 mm, thick¬ness 1 mm). Both the Ti samples and the steel samples were ground with SiO2. The surface of the steel samples was then treated by polishing with Al2O3 paste (grain size up to 1 um), while the surface of the Ti samples, i.e. a material not suitable for polishing, was finished by brushing using another type of Al2O3 paste with slightly larger grains. Thus, the surface of the steel samples was finally smoother and glossy, while the Ti surface was rougher and matte. For the in vitro biocompatibility tests, human osteoblast-like MG 63 cells (European Collection of Cell Cultures, Salisbury, UK) were used. The smaller samples (9x9 mm) were inserted into polystyrene 24-well cell culture plates (TPP, Trasadingen, Switzerland; well diameter 1.5 cm). Each well contained 25 000 cells (approx. 14 150 cells/cm2) and 1.5 ml of Dulbecco's Modified Eagle Minimum Essential Medium (DMEM; Sigma, USA, Cat. No. 10270-106) supplemented with 10% foetal bovine serum (FBS; Gibco, Cat. No. 10270-106) and gentamicin (40 /jg/ml, LEK, Slovenia). These samples were used for evaluating the size of the cell spreading area (day 1), and for evaluating cell shape and cell viability (days 1, 4 and 7 after seeding). The size of the cell spreading area was measured using Atlas Software (Tescan Ltd., Brno, Czech Republic). The viability of the cells was determined by the LIVE/ DEAD viability/cytotoxicity kit for mammalian cells (Invitrogen, Molecular Probes, USA). The larger samples (30x30 mm) were inserted into GAMA polystyrene dishes (diameter 5 cm; GAMA Group Joint-Stock Company, Ceske Budejovice, Czech Republic) and seeded with 300 000 cells/dish (approx. 15 300 cells/cm2) suspended in 9 ml of the above mentioned culture medium. These samples were used for evaluating the cell number on days 1, 4 and 7 after seeding, using a Beckman Vi-CELL XR Cell Analyser automatic cell counter. For the in vitro analysis of markers of osteogenic differentiation and cell immune activation, human osteoblast-like MG 63 cells (European Collection of Cell Cultures, Salisbury, UK) were used. The samples (9x9 mm) were inserted into polystyrene 24-well cell culture plates (TPP, Trasadingen, Switzerland; well diameter 1.5 cm). Each well contained 25 000 cells (approx. 14 150 cells/cm2) and 1.5 ml of Dulbecco's Modified Eagle Minimum Essential Medium (DMEM; Sigma, USA, Cat. No. 10270-106) supplemented with 10% foetal bovine serum (FBS; Gibco, Cat. No. 10270-106) and gentamicin (40 jg/ml, LEK, Slovenia). The cells were cultured for 1, 4, or 7 days at 37°C in a humidified atmosphere of 5% of CO2 in the air. On day 4 after seeding, the medium was changed; one half of the samples contained standard medium DMEM with 10% foetal bovine serum and gentamicin (40 jg/ml) mentioned above, and the second half contained osteogenic medium, i.e. the standard medium further supplemented with ß-glycerophosphate, L-glutamin, ascorbic acid, dihydroxyvitamin D3, dexamethason, 10% foetal bovine serum and gentamicin (40 jg/ml). Using an Enzyme-Linked ImmunoSorbent Assay (ELISA), we measured the concentration of the Inter¬cellular Adhesion Molecule-1 (ICAM-1, a marker of cell immune activation) and osteocalcin (a marker of osteogenic cell differentiation). These measurements were performed in homogenates of cells on days 4 and 7 after seeding, and the concentration of both markers was measured per cell or per mg of protein. On day 7, the amount of osteocalcin was measured and compared in cells cultured in the standard and osteogenic media. We also measured TNF-а and IL- 1ß, i.e. other markers of cell immune activation. These cytokines are important mediators of the inflammatory response, and they are involved in a variety of cellular activities, including cell proliferation and differentiation. We measured the secretion of these markers into the cell culture medium in murine macrophage-like RAW264.7 cells (American Type Culture Collection, Manassas, VA). The samples (9x9 mm) were inserted into polystyrene 24-well cell culture plates (TPP, Tra- sadingen, Switzerland; well diameter 1.5 cm). Each well contained 30,000 (approx. 16 980 cells/cm2) cells and 1.5 ml of the culture medium. RAW 264.7 cells were cultured in the RPMI-1640 medium (Sigma; 10% fetal bovine serum, 40 jg/mL gentamicin). After 7 days of cultivation, the cell culture medium was collected and used for measuring the concentration of TNF-а and IL-1ß by a sandwich ELISA using commercially available kits. A mouse TNF-а kit and an IL- 1ß Quantikine ELISA kit were used for the RAW 264.7 cells. Both kits were purchased from R and D Systems (Minneapolis, MN) and used according to the manufacturer's protocol. The results indicated that the number of initially adhering MG 63 cells on day 1 after seeding was significantly lower on the titanium (5320±390 cells/cm2) and on the stainless steel (4110±370 cells/cm2) than on the control polystyrene culture dishes (7740±350 cells/cm2). However, on day 4 after seeding, the cell population density on both metallic materials became significantly higher than on the control polystyrene dishes (75200±2890 cells/cm2 on Ti and 90 870±2350 cells/cm2 on steel vs. 56440±1180 cells/cm2 on polystyrene). This suggests faster cell proliferation on both metallic materials than on polystyrene. At the same time, the cell number on the stainless steel samples was significantly higher than on the Ti samples. On day 7, the differences in the number of adhered cells on the two metals and on the control polystyrene substrate was on an average similar (from 328780±680 cells/cm2 to 362200±760 cells/cm2). The cell viability on all tested materials was almost 100% in all culture intervals. The morphology of the cells adhered on the studied materials was similar to the morphology of the cells on the control polystyrene dishes, i.e. the cells were mostly flat and polygonal, and the size of their cell spreading areas was similar on all tested materials. The cells were distributed homogeneously on the entire material surface, and on day 4 they started to form confluent cell layers. On day 4, we measured the amount of ICAM-1 by the ELISA test. This immunoglobulin molecule is typically expressed on cells of the immune system, but it is also expressed on other cell types, including MG 63, during their immune activation, e.g. by an artificial growth support. In this case, ICAM-1 molecules on cells are bound byß2-integrin receptors on inflammatory cells (for a review, see [4]). Surprisingly, titanium seemed to be more immunogenic than stainless steel, which was indicated by a higher concentration of ICAM-1 per cell and mg of protein in cells on day 4 after seeding. However, on day 7, there was no difference between the concentrations of ICAM-1 per cell and mg of protein in cells on titanium and on stainless steel. The second molecule that we measured was osteocalcin, a calcium-binding extracellular matrix glycoprotein, an important marker of the bone formation process. The concentration of osteocalcin on day 4 in the standard culture medium was higher in MG 63 cells on the titanium and stainless steel than on the control polystyrene samples. This could be explained by the fact that the metals are harder than polystyrene. It is known that harder substrates promote osteogenic cell differentiation, while softer substrates direct the cell differentiation towards neural or muscle phenotype [5]. In addition, the osteogenic differentiation was further supported by the osteogenic medium, as indicated by a higher concentration of osteocalcin in cells grown in this medium compared to cells in the standard medium on day 7 after seeding. On day 7 after seeding murine macrophage-like RAW264.7 cells on the tested materials, the concentration of TNF-а in the culture medium ranged on an average from 57.10 to 79.39 pg per 2000000 cells. The concentration of TNF-а in the medium from Ti and Fe was significantly higher than in the medium from the control polystyrene dishes. The highest value (79.39 pg/2000000 cells) was found in the medium taken from RAW264.7 cells on Ti. The second molecule that we tested was IL-1ß. No significant differences in the concentration of IL-1ß were detected in the culture medium obtained from RAW264.7 cells on all tested materials. In other words, neither type of metallic material, i.e. Ti and Fe, evoked significantly higher production of IL-1ß by RAW 264.7 cells than standard polystyrene cell culture dishes. It can be concluded that the tests of biocompatibility and immune activation confirmed that titanium and stainless are promising for construction of bone implants and for good integration with the surrounding bone tissue.

Źródło:

Engineering of Biomaterials; 2012, 15, no. 116-117 spec. iss.; 130-131
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 72.

Tytuł:

Biocompatibility of hybrid fibrous materials basing on poly-L/DL-lactide

Autorzy:

Stodolak, E.
Ścisłowska-Czarnecka, A.
Błażewicz, M.
Bogun, M.
Mikolajczyk, T.
Menaszek, E.

Powiązania:

https://bibliotekanauki.pl/articles/286193.pdf

Data publikacji:

2010

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

hybrid biomaterials
composites
nanocomposite materials

Opis:

Hybrid biomaterials due to their unique structure may become an alternative for many popular composite and nanocomposite materials. Multilevel modification of their matrix manifesting itself in the presence of particles of different sizes i.e., micrometric, submicrometric and nanometric together with the variety of shapes of a modyfing phase (nanometric fibres, submicron particles, coated nanoparticles) and its different chemical character make the hybrid materials similar to natural tissue. Bone tissue structure is particulary close to this model in which collagen fibres and hydroxyapatite particles and nanoparticles have not only different form but first of all they play different role in the tissue which depends on their chemical nature. In the biomedical engineering syntetic hybride biomaterials are usually produced using resorbable and degradable polymer matrices and inorganic filers (ceramic bioactive particles; HAp, TCP, SiO2) or organic filers (collagen, polysaccharides e.g. alginate fibres). The main function of the modyfing phase is inprovement of the polymer matrix leading to bioactive, stronger material showing high biofunctionality. Production of hybrid materials is based mainly on experimental works, which is related to the presence in their matrix few phases with different properties which may interact. Hybrid materials do not follow the rule of mixtures thus it is difficult to predict behaviour of a material in which co-exis different chemical and phisical phases. In the work hybrid composite foils were produced in which modyfing phase consisted in; nanocomposite calcium alginate fibres modyfied with ceramic nanoparticles; HAp (CAH fibres), TCP (CAT fibres), SiO2 (CAS fibres) and MMT (CAM fibres). Short fibres were subjected to additional size reduction in vibration ball mill resultiong in submicron and nanometric phases. Size of the particels after grinding was determined by screening analysis and DLS method (for particels smaller than 500 nm). It was observed than the population of short fibres consist in three fractions i.e.; micrometric (~2μm, 50 wt.%), submicrometric (500–800 nm, 40 wt.%) and nanometric ( below 500 nm, 10 wt.%). The fibres and products of their grinding were homogenised in P(L/ DL)LA polymer solution (poly-L/DL-lactide, Purarorb 80, Purac Germany). A hybride material in the form of thin foils containing 2 wt.% of a modyfing phase were subjected to durability tests consisting in incubation in distilled water (30 days/37C). Monitoring of the medium pH and conductivity did not show changes related to harmful products of their decomposition. Osteoblast-like cells from MG-63 line contacted with the surface of the materials showed high viability (MMT test) comparable with the reference material (TCPS). High degree of adherence of the cells to the materal surface (CV test) testifies of potential abilities of the material stimulating proliferation of bone tissue cells. The highes rate of dynamic growth (increase of the cells number after 7 days of incubation) was observed for the material which was modified with CAS fibres and products of their grinding. The performed investigations have a preliminary character. Their results testify for potential osteoconductive or osteoinductive abilities of hybride materials basing on P(L/DL)LA and alginate nanocomposite fibres.

Źródło:

Engineering of Biomaterials; 2010, 13, no. 99-101; 110
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 73.

Tytuł:

Growth and study of nonlinear optical crystals at the Hungarian Academy of Sciences

Autorzy:

Földvári, I.
Polgár, K.
Péter, A.
Beregi, E.
Szaller, Z.

Powiązania:

https://bibliotekanauki.pl/articles/308743.pdf

Data publikacji:

2000

Wydawca:

Instytut Łączności - Państwowy Instytut Badawczy

Tematy:

crystal growth
nonlinear optical materials

Opis:

The former Research Laboratory for Crystal Physics continues the growth and defect structure investigation of nonlinear optical single crystals in a new organization, as a part of the Research Institute for Solid State Physics and Optics, Hungarian Academy of Sciences. The aim of the activity is to prepare specific crystals for basic and applied research as well as for applications. We improve the quality or modify the properties of well known nonlinear oxide and borate crystals and develop new materials. The principle nonlinear optical crystals in our profile are the followings: Paratellurite (TeO2), congruent, Mg-doped and stoichiometric lithium niobate (LiNbO3), a variety of sillenite structured crystals (Bi12MeO20, Me=Si, Ge, Ti, etc.), bismuth tellurite (Bi2TeO5) and nonlinear borates (BBO-beta-BaB2O4, LBO-LiB3O5, LTB-Li2B4O7, CLBO-CsLiB6O10 and YAB-YAI3(BO3)4). Details of the crystal preparation and the major achievements are discussed in the paper.

Źródło:

Journal of Telecommunications and Information Technology; 2000, 1-2; 37-41
1509-4553
1899-8852

Pojawia się w:

Journal of Telecommunications and Information Technology

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 74.

Tytuł:

Tomographic and histological assessment of bone regeneration in the experimental defects in rabbit femoral trochlea treated with resorbable scaffolds

Autorzy:

Pamuła, E.
Menaszek, E.
Malisz, P.
Dobrzyński, P.
Orzelski, M.
Silmanowicz, P.

Powiązania:

https://bibliotekanauki.pl/articles/283854.pdf

Data publikacji:

2010

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

bone regeneration
scaffolds
resorbable materials

Źródło:

Engineering of Biomaterials; 2010, 13, no. 99-101; 123-124
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 75.

Tytuł:

Modelling of UAVs composite structures and prediction of safety factor

Autorzy:

Grodzki, W.
Łukaszewicz, A.
Leśniewski, K.

Powiązania:

https://bibliotekanauki.pl/articles/118281.pdf

Data publikacji:

2015

Wydawca:

Polskie Towarzystwo Promocji Wiedzy

Tematy:

composite materials
simulation
CAx systems

Opis:

The paper presents possibilities of composite materials modeling using SolidWorks enviroment on example of Unmanned Aerial Vehicle wing structure. Mechanical properties of composite materials used in UAV's and process of modeling such structures in SolidWorks are described. The research problem is CFD and strenght analysis of considered structure in SolidWorks Flow Simulation. Different displacement, stresses and safety factors values were obtained for analysed types of loads. The presented approach was used to develop aircraft wing for Air Challenge 2015 competition.

Źródło:

Applied Computer Science; 2015, 11, 3; 67-75
1895-3735

Pojawia się w:

Applied Computer Science

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 76.

Tytuł:

Aspects of the applications of composite materials in combustion engines

Autorzy:

Posmyk, A.
Filipczyk, J

Powiązania:

https://bibliotekanauki.pl/articles/247373.pdf

Data publikacji:

2013

Wydawca:

Instytut Techniczny Wojsk Lotniczych

Tematy:

combustion engines
composite materials
wear

Opis:

The paper presents the results of investigations concerning the possibilities of application of composite materials in the construction of internal combustion engines. The total mass of the engine can be reduced by allying composite materials, which have a much higher strength than hitherto applied conventional materials. Less thermal expansion allows reducing assembly clearance between the piston and cylinder. The surface topography after the process of machining of composite materials contains hollows, which act as trays for lubricant, wear products and pollution particulates. Therefore, it is possible to reduce friction, fuel consumption, level of exhaust emission and improve the durability of engine. During the investigations, the engine piston made of aluminium matrix composite has been tested. The tests were related to the influence of surface topography of the piston skirt containing Al2O3 particles on the adsorption of lubricating oil, which facilitates lubrication in small displacement test engine. Aluminium matrix composite materials have some disadvantages, too. The most important are higher finishing costs and higher wear of the other sliding element. To reduce the finishing costs of making the suitable surface, special methods for example water jet cutting, have been worked out. To reduce the wear of the other sliding element, reinforcing spherical particles without sharp edges should be applied. Covering the tribological partner-sliding surface with a composite surface layer (e.g. Cr+Al2O3) can result in a relevant reduction of its wear.

Źródło:

Journal of KONES; 2013, 20, 4; 357-361
1231-4005
2354-0133

Pojawia się w:

Journal of KONES

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 77.

Tytuł:

Biodegradowalne stenty wieńcowe – przegląd
Biodegradable coronary stents – overview

Autorzy:

Ilnicka, M.
Wawrzyńska, M.
Biały, D.

Powiązania:

https://bibliotekanauki.pl/articles/261270.pdf

Data publikacji:

2009

Wydawca:

Politechnika Wrocławska. Wydział Podstawowych Problemów Techniki. Katedra Inżynierii Biomedycznej

Tematy:

stent
materiały biodegradowalne
biodegradable materials

Opis:

Wprowadzenie stentów wieńcowych do praktyki klinicznej zrewolucjonizowało kardiologię interwencyjną. Postępy technologiczne w tworzeniu nowych biomateriałów, a także leków, które mogą być uwalniane z pokrycia stentu, decydują o pojawieniu się nowych generacji tych implantów. Ważną rolę mogą odegrać materiały biodegradowalne, które dodatkowo uwalniając leki, poprawiają skuteczność i bezpieczeństwo stentów. W pracy dokonano przeglądu opublikowanych wyników badań przedklinicznych i klinicznych na temat biodegradowalnych stentów wieńcowych.
Introduction of coronary artery stents into the clinical practice has revolutionized interventional cardiology. Technological development in biomaterial science, as well as in pharmacological drugs that can be eluted from stent coating, has led to production and examination of new stent types. Biodegradable materials in combination with eluted drugs may enhance stent efficacy and safety, therefore they may play an important role in the stent construction. This paper presents the literature survey of reports on clinical and preclinical studies of biodegradable coronary artery stents.

Źródło:

Acta Bio-Optica et Informatica Medica. Inżynieria Biomedyczna; 2009, 15, 4; 369-372
1234-5563

Pojawia się w:

Acta Bio-Optica et Informatica Medica. Inżynieria Biomedyczna

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 78.

Tytuł:

Burden Optimisation of Lump Charge Materials for Foundry Furnaces

Autorzy:

Ziółkowski, E.

Powiązania:

https://bibliotekanauki.pl/articles/355733.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

burden of lump chargé materials

Opis:

Calculation of economically optimum charge burden for foundry furnaces depends on a solution that can be found in the field of mathematical linear programming. A traditional linear optimisation method means looking for continuous variables that can define portion of every charge component. Sometimes, it can be observed that a calculated portion of charge material with a defined lump mass is rounded up, which is wrong because the charge burden prepared in such a way may either show a mistaken chemical composition, or it can entail a significant cost. With charge materials characterised by defined mass lumps, it is recommended to use a modified method of integer linear optimisation. This article contains definitions of a goal function and a system of constraints considering the charge materials as stated above. In addition, a sample calculation has been included hereto to show such optimisation for a selected process of metal melting in a casting furnace.

Źródło:

Archives of Metallurgy and Materials; 2017, 62, 4; 2217-2221
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 79.

Tytuł:

Kinetics of Corrosion Process in H2SO4 and HNO3 Aqueous Solutions of Lead Free Sn-Ag-Cu Solder Alloys

Autorzy:

Guśpiel, J.
Wierzbicka-Miernik, A.
Reczyński, W.

Powiązania:

https://bibliotekanauki.pl/articles/352914.pdf

Data publikacji:

2016

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

electronic materials
polarization
acid corrosion

Opis:

This paper presents the results of the corrosion resistance of Sn-Ag-Cu alloys in air-saturated aqueous solutions containing NO₃^-, SO₄^2- ions, whose concentration was equivalent to their contents in acid rains and in concentrations 10 - 100 times higher. The Ag, Cu and Sn concentrations in the corrosive media were determined using the Atomic Absorption Spectrometry. The specific dissolution rate and corrosion current were derived using the a rotating disc technique. The corrosion rate of Sn- Ag-Cu alloys depends on pH of the examined solutions and on the concentration of oxygen near the phase boundary. In the whole range of concentrations of the applied H₂SO₄ + HNO₃ mixtures of acids, the pure Sn was more corrosion resistant than eutectic alloy as well as the near eutectic one, following the sequence: Sn>Sn3.66Ag0.91Cu>3.8Ag0.7Cu.

Źródło:

Archives of Metallurgy and Materials; 2016, 61, 2A; 559-568
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 80.

Tytuł:

The Magnetic and Electric Measurements of the Multiferroic PbFe1/2Nb1/2O3 Ceramics Obtained Using Hot Uniaxial Pressure Method

Autorzy:

Bochenek, D.
Skulski, R.
Niemiec, P.
Brzezińska, D.
Rogacki, K.

Powiązania:

https://bibliotekanauki.pl/articles/353272.pdf

Data publikacji:

2018

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

multiferroics
relaxor materials
magnetoelectric transducers

Opis:

We present the results of investigations of Pb(Fe_1/2Nb_1/2)O₃ (PFN) ceramic samples obtained using two-step synthesis (i.e. columbite method). For obtained samples complex investigations of microstructure, magnetic and electrophysical properties have been performed at low and at high temperatures. Microstructure is characterized by small grains with high homogeneity and high density (low porosity). Impedance of samples and the phase shift angle have been measured using LCR Meter. Next the AC electric conductivity, dielectric permittivity and loss tangent have been calculated. AC conductivity at frequency 3 Hz was measured in similar way using Quantum Design PPMS System in magnetic fields 1000 Oe and 10000 Oe. At temperature range 240 K - 260 K the anomalies of conductivity are observed. These anomalies depend on measuring cycle (heating, cooling) and magnetic field.

Źródło:

Archives of Metallurgy and Materials; 2018, 63, 3; 1243-1247
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 81.

Tytuł:

Use of Lean Toolbox for Identification of Waste

Autorzy:

Zwolińska, B.
Smolińska, K.
Michlowicz, E.

Powiązania:

https://bibliotekanauki.pl/articles/409294.pdf

Data publikacji:

2016

Wydawca:

Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej

Tematy:

materials flow
lean production methods

Opis:

Business management according to the Lean Management concept is a constant and comprehensive process of implementing changes in process and organizational structure. Some of the key elements in production management according to the Lean concept include: correcting mistakes (e.g. TQM), eliminating the existing Muda (e.g. Kaizen, 5S) increasing effectiveness of value adding processes (e.g. TPM) and reducing duration of activities that are essential, but do not generate added value (e.g. SMED). The article involves examples of using tools of the Lean toolbox (i.e. VSM, Spaghetti plot) at the stage of identifying losses in a chosen production process.

Źródło:

Research in Logistics & Production; 2016, 6, 3; 207-216
2083-4942
2083-4950

Pojawia się w:

Research in Logistics & Production

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 82.

Tytuł:

Modeling of adsorption phenomena in porous materials of carbonaceous origin by employing multilayer clustering based adsorption model (uniBET) with various variants of geometrical and energetical heterogeneities

Autorzy:

Ziółkowska, Magda Regina
Milewska-Duda, Janina
Duda, Jan Tadeusz

Powiązania:

https://bibliotekanauki.pl/articles/763930.pdf

Data publikacji:

2016

Wydawca:

Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej

Tematy:

adsorption
mathematical modeling
porous materials

Opis:

Multilayer clustering based adsorption model (uniBET) is aimed at adsorption phenomena modeling with having regard to surface geometrical and energetical heterogeneities. Facilitation of the uniBET model formulas leads to the LBET class models. A review on uniBET model and the analysis of the multilayer heterogeneous adsorption models for characterization of porous materials of carbonaceous origin are presented.

Źródło:

Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia; 2016, 71, 1
2083-358X

Pojawia się w:

Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 83.

Tytuł:

Analysis of the environmental impact of the hull construction of a small vessel based on LCA

Autorzy:

Nakielski, Jacek

Powiązania:

https://bibliotekanauki.pl/articles/34599948.pdf

Data publikacji:

2023

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

LCA
hull
craft
recycling materials

Opis:

In recent years, issues related to the impact of human activity on the natural environment have become pressing, and the challenge of global warming necessitates immediate action. To support environmental protection efforts, it has become imperative to adopt a broader perspective when evaluating various products and systems. A valuable tool for such assessments is a life cycle assessment (LCA), which enables a comprehensive analysis of the entire life cycle of a product. This paper presents a comparative analysis of the hull of a fast patrol craft, fabricated using three different materials: steel, aluminium, and composite materials. The LCA covers every stage from material production, through the construction and use of the hull, to its eventual disposal. A specific criterion was established to evaluate the impact of the hull on the environment, with clearly defined system boundaries. In the final section, we draw some conclusions that underscore the importance of reusing construction materials. By emphasising this approach, ecological footprints can be minimised and a sustainable future can be created.

Źródło:

Polish Maritime Research; 2023, 4; 54-60
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 84.

Tytuł:

The problem of engineering materials selection in relation to the expected properties

Autorzy:

Cepil, M.

Powiązania:

https://bibliotekanauki.pl/articles/299171.pdf

Data publikacji:

2012

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH

Tematy:

construction materials
gas pipelines
steel

Opis:

Nowadays, in the selection of construction materials the most important thing is the unit price, though more expensive materials are very often replaced by cheap plastic as long as their use provides the durability and safety of the constructions. Even after using a lot of treatments to improve their mechanical, physical, in-use and technological properties, engineering materials sometimes do not meet the expected requirements. Therefore, today's products consist of many components made of different materials conforming to specific functions. The subject of the presentation is to analyze the characteristics of engineering materials and the possibility of their modifications depending on the expected parameters. The presentation also focuses on the selection of materials regarding their strength calculations, working conditions (including the impact of the environment on the part of the design), application of the optimal methods of manufacturing etc.

Źródło:

AGH Drilling, Oil, Gas; 2012, 29, 4; 447-451
2299-4157
2300-7052

Pojawia się w:

AGH Drilling, Oil, Gas

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 85.

Tytuł:

Hyperfine interactions in x-Bi0.95Dy0.05FeO3-(1-x)-Pb(Fe2/3W1/3)O3 multiferroics

Autorzy:

Zachariasz, P.
Stoch, A.
Stoch, P.
Maurin, J.

Powiązania:

https://bibliotekanauki.pl/articles/147354.pdf

Data publikacji:

2013

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

multiferroics
multifunctional materials
Néel temperature

Opis:

The complex perovskite system xźBi0.95Dy0.05FeO3-(1 - x)źPb(Fe2/3W1/3)O3 was synthesized by the solid-state reaction method and was studied by means of Mössbauer spectroscopy. For different Dy-doped bismuth ferrite (BDF) contents (x = 0.1, 0.3, 0.5, 0.7) the formation of single-phase sinters was confirmed using an X-ray diffraction technique. The random distributions of Fe/W cations in crystallographic structures have been proved. A monotonically, saturation- like increase of Néel temperatures with growing BDF contribution was confirmed, and a straightforward dependence between TN temperatures and the mean hyperfine magnetic fields at Fe nuclei was shown.

Źródło:

Nukleonika; 2013, 58, 1; 53-56
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 86.

Tytuł:

Application of the multiscale FEM to the modeling of nonlinear multiphase materials
Zastosowanie wieloskalowej MES do modelowania nieliniowych wieloskładnikowych materiałów

Autorzy:

Ilic, S.
Hackl, K.

Powiązania:

https://bibliotekanauki.pl/articles/279412.pdf

Data publikacji:

2009

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

multiscale FEM
composite materials
homogenization

Opis:

This contribution is concerned with the modeling of composite materials and, particularly, with the application of the multiscale finite element method for that purpose. The method is a result of combining homogenization theory with the finite element method and is based on the idea of splitting the simulation of a heterogeneous body into two tasks: the first one is the modeling of the actual body and the second one the modeling of the representative volume element, the material sample whose analysis replaces the missing effective constitutive law. The connection of these two simulation levels is achieved by introducing the Hill macrohomogeneity condition which requires the equality of the macropower and the volume average of the micropower. The method has the advantage to be applicable for simulation of materials with very different microstructure types. This is illustrated by the examples concerned with effective behavior of two- and three-phase composite materials.
Praca dotyczy modelowania materiałów kompozytowych, a w szczególności zastosowania wieloskalowej metody elementów skończonych do tego celu. Metoda ta jest kombinacją MES oraz teorii homogenizacji i opiera się na podziale zadania symulacji niejednorodnego ciała na dwa poziomy: modelowania właściwego tego ciała i modelowania reprezentatywnego elementu materiału próbki, którego analiza ma uzupełnić brakujące efektywne równanie konstytutywne materiału. Połączenie obydwu poziomów symulacji jest osiągalne po wprowadzeniu warunku homogenizacji Hilla, który narzuca równość mocy w skali makro z mocą mikroskalową uśrednioną objętościowo. Zaletą metody jest jej aplikacyjność do analizy materiałów o bardzo różnorodnej mikrostrukturze. Zilustrowano to w pracy na przykładzie badań efektywnego zachowania dwu- i trójskładnikowych kompozytów.

Źródło:

Journal of Theoretical and Applied Mechanics; 2009, 47, 3; 537-551
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 87.

Tytuł:

Transport rules and assessment of threats connected with transport of hazardous materials by train

Autorzy:

Bojar, P.
Woropay, M.
Migawa, K.
Szubartowski, M.
Muślewski, Ł.

Powiązania:

https://bibliotekanauki.pl/articles/245450.pdf

Data publikacji:

2011

Wydawca:

Instytut Techniczny Wojsk Lotniczych

Tematy:

railway transport
hazardous materials
RID

Opis:

Every year in Poland, approximately 22 million tons of dangerous materials is transported, which, apart from the German railway, places it on the second position in Europe. The most numerous group of dangerous materials include items of class 3 (liquid, flammable materials), especially liquid fuels. In order to prevent accidents and remove their effects, the European Union countries have developed an international code regulating transport of dangerous materials by railway, RID. Every year 110 billion ton kilometres of dangerous materials are transported on the territory of the EU. Materials carried by road transport account for 58%, by railway 25% and by water 17% of all the transported dangerous products. Transport of dangerous materials accounts for 8% of all freight transports in the European Union. Having in view natural environment protection and safety of people, there are carried out works on one legal act to account for all the three transport branches. Railway transports of dangerous materials are performed in a safe way and rare, in terms of the transports number, accidents and failures do not cause harmful effects, neither on people nor the natural environment. In the paper, there has been made an analysis of transport procedures and threats which occur while carrying dangerous materials. On the basis of carried out investigations an assessment of the risk factor in the studied process has been presented. General rules for transport of dangerous materials by railway and their classification have been presented, markings according to RDI regulations. An attempt of threats identification and analysis of the maim causes of undesirable events occurrence during railway transport of dangerous materials has been made by the authors of this work.

Źródło:

Journal of KONES; 2011, 18, 3; 37-43
1231-4005
2354-0133

Pojawia się w:

Journal of KONES

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 88.

Tytuł:

Pre-formulation Compatibility Studies of 5-Amino-1H-tetrazole Nitrate with Several Typical Materials by Thermal and Non-thermal Techniques

Autorzy:

Guo, W.
Han, Z.
Lin, Q.
Wang, B.

Powiązania:

https://bibliotekanauki.pl/articles/358375.pdf

Data publikacji:

2018

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego

Tematy:

5-ATN
compatibility
energetic materials

Opis:

The aim of the present study was to assess the physicochemical compatibility of a promising energetic salt, 5-amino-1H-tetrazole nitrate (5-ATN), with some typical materials. Thermal techniques (differential scanning calorimetry (DSC) and vacuum stability test (VST)) and non-thermal techniques (X-ray diffractometry (XRD) and Fourier Transform Infrared Spectroscopy (FTIR)) were applied. Five energetic materials (TNT, RDX, HMX, CL-20 and AP) and three common additives (Al, DOS and F2604-2) were tested to evaluate their compatibility with 5-ATN. Based on the DSC results, except for AP that was only partially compatible with 5-ATN, all of the selected materials exhibited good compatible with 5-ATN. The VST test further confirmed the compatibility of the 5-ATN/AP mixtures. Combined with the thermal methods, the FTIR results agreed with the DSC findings. The XRD results showed some differences.

Źródło:

Central European Journal of Energetic Materials; 2018, 15, 1; 100-114
1733-7178

Pojawia się w:

Central European Journal of Energetic Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 89.

Tytuł:

Actual challenges, opportunities, and perspectives of composite materials

Autorzy:

Bosacka, Alicja
Zienkiewicz-Strzałka, Małgorzata

Powiązania:

https://bibliotekanauki.pl/articles/2079947.pdf

Data publikacji:

2019

Wydawca:

Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej

Tematy:

composite materials, biocomposites, nanocomposites, synergism

Opis:

The development of technology is associated with a strong need for changes in the design and manufacture of new types of materials. Monolithic materials such as ceramics or metals have become insufficient for the needs of the modern market. The combination of several types of materials in one system turned out to be the right solution. Composite materials as multi-phase materials show improved properties compared with individual structural elements and can give the opportunity to design systems with enhanced specific characteristics.The presented work provides a review of actual literature dedicated to composite materials. In this work, the basic terminology, the division of composite systems, the most commonly used methods for composites preparation as well as physicochemical characteristics and potential applications of these types of matter were presented.

Źródło:

Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia; 2019, 74, 1; 41-54
2083-358X

Pojawia się w:

Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 90.

Tytuł:

Collagen material ≪Collost≫ in dental surgery

Autorzy:

Pohodenko-Chudakova, I. O.
Rachkov, A. A.

Powiązania:

https://bibliotekanauki.pl/articles/285208.pdf

Data publikacji:

2016

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

dental surgery
collagen materials
collost

Źródło:

Engineering of Biomaterials; 2016, 19, 138; 12
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 91.

Tytuł:

Biomaterial modifications and cellular behavior

Autorzy:

Staehlke, S.
Rebl, H.
Nebe, J. B.

Powiązania:

https://bibliotekanauki.pl/articles/285488.pdf

Data publikacji:

2017

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

biomaterials
cell biology
medical materials

Źródło:

Engineering of Biomaterials; 2017, 20, no. 143 spec. iss.; 16
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 92.

Tytuł:

The vitamin B1 release from collagen, chitosan and hyaluronic acid blends

Autorzy:

Kaczmarek, B.
Sionkowska, A.
Bladzich, A.

Powiązania:

https://bibliotekanauki.pl/articles/286151.pdf

Data publikacji:

2016

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

natural polymers
biomedical materials
vitamins

Źródło:

Engineering of Biomaterials; 2016, 19, 138; 44
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 93.

Tytuł:

Vibrational spectroscopy investigation of montmorillonite - chitosane nanocomposite materials

Autorzy:

Paluszkiewicz, C.
Stodolak, E.

Powiązania:

https://bibliotekanauki.pl/articles/283761.pdf

Data publikacji:

2010

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

biomaterials
nanocomposite materials
vibrational spectroscopy

Opis:

Biomaterials basing on natural polysaccharides, i.e. hiauronic acid, alginate, chitosane are an alternative for already applied bioresorbable synthetic materials basing on synthetic polyhydroxyacids. Their main advantages are good accessibility, low cost, easy forming and high biocompatibility. Additionally, they are a perfect matrix for bioactive nanoparticles i.e. hydroxyapatite (HAp), tricalcium phosphate (TCP) and silica (SiO2). The work presents results of research on nanocomposite consisting of chitosane matrix (CS) modified with a nanofiller, which was natural montmorillonite (MMT). Nanocomposite foils were produced by the casting method. In order to induce better biocompatibility, the surface of the CS/MMT composite was neutralized (bath in NaOH solution). The nanocomposite foils were subjected to a bioactivity test by incubation in SBF at 37oC for 7 days. It was observed that the CS/MMT material surface showed a local supersaturation, which was a result of apatite nucleation. The CS/MMT nanocomposites were investigated using FT-IR (Fourier Transform Infrared Spectroscopy) and Fourier Raman Spectroscopy. FTIR measurements of the samples were carried out on the transmission and reflection modes. The FTIR microscopy spectra were collected using Bio-Rad Excalibur with ATR attachment as well as microscope UMA500 equipped with MCT detector. Spectra were measured at 4 cm-1 resolution in the region from 4000 cm-1 to 600 cm-1. FT-Raman spectra were obtained using a FTS6000 Bio-Rad spectrometer with Ge detector. The samples were excited with a Nd-YAG laser (1064nm). Additional all materials in all steps experiments were observed under Scanning Electron Microscopy (Nova NanoSEM). Vibrational spectroscopy methods (FT Raman and FTIR) can be used for investigation of nanocomposite foils basing on biopolymers. High sensitivity the applied spectroscopy techniques show that in the result of the neutralization of CS/MMT foil (via incubation in NaOH solution) the biopolymer chain breaks. This phenomena is visible by intensity ratio between COC/ COH bands. Increase of reactivity of chitosane chain lead to entrapment of PO43-, which is the origin of the apatite forms nucleation process. Chemical treatment of the nanocomposite foils, i.e. NaOH washes influences their chemical structure and microstructure. Neutralisation of the foils is the first processing stage which precedes the potential use of CS/MMT foils in biomedical applications. The materials show a tendency to apatite crystallisation which may support regeneration of damaged bone tissue. The applied spectroscopic methods allowed to observe changes in the whole volume of the sample. Individual ATR measurements taken at various spectral ranges and penetration depths allow to observe subtle changes in the polymer matrix caused by chemical treatment (NaOH and SBF incubation). Results of the investigations indicate that in the CS/ MMT systems new chemical bonds and related to them vibrations appear. Quantity and quality of the interactions is related to characteristics of the nanoparticle and the presence of forming apatite structures.

Źródło:

Engineering of Biomaterials; 2010, 13, no. 99-101; 128
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 94.

Tytuł:

Micro-CT analysis of bonding of conventional and glass fibre composite fillings

Autorzy:

Surowska, B.
Ostapiuk, M.
Tarczydło, B.

Powiązania:

https://bibliotekanauki.pl/articles/284063.pdf

Data publikacji:

2016

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

composite materials
glass fibres
tests

Źródło:

Engineering of Biomaterials; 2016, 19, 138; 39
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 95.

Tytuł:

Air Transport of Explosives – Modern Solutions

Autorzy:

Herc, Kamila
Zakrzewska, Barbara

Powiązania:

https://bibliotekanauki.pl/articles/466217.pdf

Data publikacji:

2018-06-30

Wydawca:

Centrum Rzeczoznawstwa Budowlanego Sp. z o.o.

Tematy:

air transport
dangerous materials
explosives

Opis:

The paper is an introduction into the area of hazardous materials transportation. It includes the description of hazardous materials, classification of hazardous materials, and the list of documents necessary for organizing transport of such materials, as well as the advantages and disadvantages of air transport of hazardous materials, and identification and resolution of problems. The aim of the article is to present the up-to-date information on air transport of explosives in the Polish Army, to identify the problems encountered during the transport preparation process, and to discuss the solution that may improve the current state of affairs. The improvements proposed by the authors include: improvement of dangerous goods labeling, introduction of Polish instructions and transport documents in the Polish Armed Forces, and training of the personnel handling transport in Poland. The proposed solution, when implemented, would help to reduce mistakes in labeling goods, enhance the training process of personnel handling transport, as well as to facilitate the preparation of transport documentation. The starting point for the proposed results came from own research, interviews with specialists dealing with the transport of hazardous materials, including explosives, as well as international transport manuals and instructions.

Źródło:

Safety & Defense; 2018, 4(1), 1; 37-42
2450-551X

Pojawia się w:

Safety & Defense

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 96.

Tytuł:

Chemistry for nanotechnology

Autorzy:

Schroeder, G.
Kurczewska, J.

Powiązania:

https://bibliotekanauki.pl/articles/778392.pdf

Data publikacji:

2014

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

nanotechnology
materials chemistry
supramolecular chemistry

Opis:

In recent years, the processing order during the synthesis of new chemical compounds has been redefined. Until now a chemist considered primarily receiving a new compound and only then searched for its potential application. The new philosophy of proceedings forces chemists to answer the question: what physical and chemical properties a new chemical compound must have, and what should be structured. After that it has to be planned how to get the compound including the defined budget. The compounds obtained by conventional chemical synthesis are then used to create new functional materials having the properties as scheduled. The paper presents the way of the proceedings from a molecular receptor to a new nanomaterial containing this receptor, so in other words from individual molecules to new material with specific and previously planned properties.

Źródło:

Polish Journal of Chemical Technology; 2014, 16, 1; 70-74
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 97.

Tytuł:

Review of Nano-thermites: a Pathway to Enhanced Energetic Materials

Autorzy:

Zaky, Mohamed Gaber
Elbeih, Ahmed
Elshenawy, Tamer

Powiązania:

https://bibliotekanauki.pl/articles/27787860.pdf

Data publikacji:

2021

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego

Tematy:

energetic materials
nanothermite
synthesis
applications

Opis:

Nano-thermites or metastable intermolecular composites (MICs) have been implemented into modern research on energetic materials as they offer much higher energy densities, higher rates of energy release, stability, and safety (lower sensitivity). This paper reviews several synthetic methods for MICs that have been well thought-out for energetic applications, advantages and disadvantages, as well as the characteristics of each manufacturing technique. The techniques presented include powder mixing, sol-gel, synthesis of MICs based on nano-porous silicon (Psi), sputtering, multilayer nano-foils and electrolytically plated carbon nano-materials for nano-thermite applications. These techniques offer enormously different characteristics and, through the variation of various chemical techniques and conditions, a wide range of chemical and energetic properties may be attained. This may give the opportunity for the safe use of MICs as replacements for some conventional energetic materials in various applications, and may also enable us to study the effects when incorporating these MICs into energetic matrixes, as a promising and feasible research field.

Źródło:

Central European Journal of Energetic Materials; 2021, 18, 1; 63--85
1733-7178

Pojawia się w:

Central European Journal of Energetic Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 98.

Tytuł:

Optymalizacja konstrukcji transformatorów w aplikacjach elektromobilnych
Optimization of transformer constructions in electromobile applications

Autorzy:

Łukiewski, M.
Łukiewska, A.

Powiązania:

https://bibliotekanauki.pl/articles/1197465.pdf

Data publikacji:

2018

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel

Tematy:

transformatory przetwornic statycznych
materiały amorficzne
materiały nanokrystaliczne
transformers static converters
amorphous materials
nanocrystalline materials

Opis:

In this article selected optimizing issues related to the construction of the transformers worked in static converters of electro-mobile vehicles were discussed. The simulation of the effect of core magnetic material on the losses and transformer sizes have been compared. Moreover, the increase of effected – cooling due to solution of transformer construction were performed. The parameters were simulated using designsoftware by RALE Engineering GmbH.
W artykule omówiono wybrane zagadnienia optymalizacyjne związane z budową transformatorów pracujących w przetwornicach pojazdów elektromobilnych. Porównano wyniki symulacji wpływu materiału magnetycznego rdzenia na straty i wymiary gabarytowe transformatora. Przedstawiono również optymalizację konstrukcji transformatora w celu zwiększenia skuteczności wymuszonego chłodzenia. Parametry symulowano wykorzystując oprogramowanie projektowe firmy RALE Engineering GmbH.

Źródło:

Maszyny Elektryczne: zeszyty problemowe; 2018, 3, 119; 185-188
0239-3646
2084-5618

Pojawia się w:

Maszyny Elektryczne: zeszyty problemowe

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 99.

Tytuł:

Materiały odniesienia - krótka charakterystyka oraz wymagania dotyczące ich produkcji w oparciu oprojekt MODAS

Autorzy:

Dubalska, K.
Rutkowska, M.
Konieczka, P.
Namieśnik, J.

Powiązania:

https://bibliotekanauki.pl/articles/1425916.pdf

Data publikacji:

2013

Wydawca:

Główny Urząd Miar

Tematy:

materiały odniesienia
certyfikowany materiał odniesienia
analiza środowiskowa
reference materials
certified reference materials
environmental analysis

Opis:

W artykule przedstawiono ogólny schemat toku postępowania prowadzącego do przygotowania materiałów odniesienia. Można też przeczytać o realizacji prac w ramach projektu rozwojowo-badawczego (MODAS).

Źródło:

Metrologia i Probiernictwo : biuletyn Głównego Urzędu Miar; 2013, 2; 8-10
2300-8806

Pojawia się w:

Metrologia i Probiernictwo : biuletyn Głównego Urzędu Miar

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 100.

Tytuł:

Zastosowanie transmisyjnej mikroskopii elektronowej w badaniach materiałów inżynierskich

Autorzy:

Pawlyta, M.
Szindler, M.
Łukowiec, D.

Powiązania:

https://bibliotekanauki.pl/articles/274412.pdf

Data publikacji:

2017

Wydawca:

Roble

Tematy:

transmisyjna mikroskopia elektronowa
badanie materiałów
materiały inżynierskie
transmission electron microscopy
materials testing
engineering materials

Źródło:

LAB Laboratoria, Aparatura, Badania; 2017, 22, 5; 6-10
1427-5619

Pojawia się w:

LAB Laboratoria, Aparatura, Badania

Dostawca treści:

Biblioteka Nauki

/5

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