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Wyświetlanie 1-25 z 2463
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
Wyświetlanie 1-25 z 2463

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