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

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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

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