Materials Literature
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Various functional materials have inhomogeneous structure with essentially different diffusion kinetics in their subsystems. The importance of determining the effective diffusivity may be crucial while considering nanocrystalline materials. In nanocrystalline materials volume fractions of grains (crystallites) and int…
New copolymers based on methylmethacrylate containing distributed phenantrenequinone molecules have been produced for the purpose of optical recording by generating holographic diffractive structures under laser illumination. Chemical conditions for formation of holograms are discussed and confirmed by the spectral ch…
Silver nanoparticles (AgNPs) –containing dressings are increasingly being used in \nthe treatment of wounds and skin burns. Recently we demonstrated that AgNPs \ncan be massively released as agglomerates onto the skin, penetrate deeply into the \ndermis, enter into the fibroblasts by endocytosis, and accumulate to a r…
A Fe based composite coating reinforced by in situ synthesized TiB2 and TiC particles was fabricated on Cr12MoV steel b y using 6KW fiber laser cladding. The microstructure and the microhardness of the coating in profile across were investigated by means of X ray diffraction, scanning electron microscopy (SEM), energy…
A theoretical approach was used to calculate an inside layer of paraffin to moderate neutrons generated by a 20 MBq Californium-252 (Cf-252) source and subsequently an outside layer of lead to shield the gammas being produced in the paraffin. Materials are evaluated in terms of moderating power, absorbing ability, cos…
International audience
A tömegműanyagok közül a PET felhasználás tekinthető az egyik legnagyobbnak. Ennek az anyagnak a visszagyűjtése részben megoldott, így nagy mennyiségben áll rendelkezésre PET darálék. A regranulálás során molekula szerkezeti változások következnek be, amelyek vizsgálata reológiai, termoanalitikai mérésekkel lehetséges.
The electrolyte is the carrier of ion transfer in the battery,which is the indispensable part of lithium-ion batteries and immediately influence the electrochemical performance of batteries.The research of sulfone-based electrolyte at the theoretical level and experimentally was introduced.The oxidation stability of t…
International audience
The present paper discusses about noble idea on various reactions including hydrides, hydrogen peroxide and nano-sized metal powders, which do not emit toxic materials as well as carbon dioxide. Here in this paper, the very first-ever concept that heat energy can be generated from the direct reaction between sodium bo…
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Tato bakalářská práce poskytuje přehled o látkách, které fungují jako mazací média ve svém přirozeném prostředí. První část práce se zabývá mazivy v lidském těle. Podrobně jsou tak popsány látky jako například voda, krev, či synoviální kapalina. Následující kapitola pojednává o mazivech v oblasti běžného lidského živo…
己二酸装置真空冷却结晶是己二酸制备的重要工艺流程,流程主要通过多个串联的结晶隔室完成,结晶是一个持续性、动态性的过程,各室内以及整体结晶质量影响因素较多,结晶室壁结疤是影响结晶效用的主要原因.应通过集控中心,调控各室内压力与温度、在首个结晶室加入晶种溶液、控制搅拌速度、加强监控等方法加速晶核生长,提高结晶单元整个工艺流程效用,延长结晶器运行周期.
The Planning Assessment Commission decides a major new open cut coal mine can go ahead on some of the most fertile farm land in Australia
Polylactide-co-glycolide(75/25)was synthesized by ring-opening copolymerization using lactide and glycolide as the starting materials and stannous octoate as the initiator; The obtained polymeric materials were characterized by infrared spectrum and proton nuclear magnetic resonance spectrum. The GPC experimental resu…
Activated carbon fibers were prepared from Oxi-PAN(polyacronitile) fibers by physical activation using steam or chemical activation using potassium hydroxide with different concentration. Textural properties, amount of iodine adsorption, pore size distribution, and adsorption characteristic of ammonia of the activated…
In this work, we have prepared chemically activated multi-walled carbon nanotubes (CAMWNTs) using a potassium hydroxide for methane storage. CAMWNTs were treated at various temperatures. The structural properties were measured by Fourier Transform Raman (FT-Raman). The morphological properties were investigated by sca…
Thin films consisting of conducting polymer nanostructures provide a larger surface-to-volume ratio for charge-carrier transport as compared to their bulky counterparts.Thus, a facile and inexpensive fabrication technique for conducting polymers on the basis of solution processing, which offer a reproducible control o…
Bu çalışmada, atık lastik sıvısında üretilen benzin benzeri yakıtın (BBY) ve benzin yakıtına (BY) kütlesel olarak 10%, 20%, ve 30% oranlarında BBY ile yapılan karışımının, buji ateşlemeli (BA) motorda performans ve egzoz emisyon karakteristikleri incelenmiştir. Deneylerde, fren torku, güç, ortalama fren efektif basınc…
광경화형 음이온 전착도장이 가능한 폴리우레탄 아크릴레이트를 합성 하였다. 우레탄 아크릴레이트는 경도와 유연성을 동시에 부여 할 수 있고 조절이 용이하여 물성이 우수한 도막을 얻을 수 있다. 1차로 폴리올, 카르복실기 및 이소시아네이트로 구성된 프리폴리머를 합성하였고 2차로 프리폴리머 말단에 아크릴기를 도입하여 우레탄 아크릴레이트를 제조 하였다. 제조한 우레탄 아크릴레이트수지에 광개시제와 다관능 올리고머를 혼합고 중화 후 수분산 시킨 도료는 상 분리 없이 안정 하였다. 다관능 올리고머 함량 변화에 따른 수분산도료의 입자크기, 전착 도장 후 경화된 도막의 외관, 경도,…