Materials Literature
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Multi-wall carbon nanotubes(MWCNT) exhibit extraordinary mechanical and electronicproperties. However, the preparation and processing of MWCNT cpmposites has been limited by their dispersity. The presence of hydroxy groups formed by the surface oxidation of MWCNT increases the dispersion of MWCNT in polytetrafluoroeth…
We prepared aromatic diaminoanthraquinone derivatives a1, b1, a2, b2, a3, and b3 by the reaction of 1,5- and 1,8-dichloroanthraquinone by using aniline, 2-aminobenzothiazole, and 1-aminonaphthalene in order to know the effect on the maximum absorption wavelength due to changes in the aromatic group. The optical proper…
以化学气相渗透(CVI)技术制备的 2D C/ SiC 复合材料为研究对象,探讨复合材料在 700、1000 和 1300°C空气环境中发生不同形式和不同程度氧化损伤后的阻尼行为变化。 采用扫描电子显微镜(SEM)观察和分析复合材料的微结构损伤, 采用动态力学分析仪(DMA)测试复合材料损伤前后的阻尼性能。 结果表明:在700°C和1000°C空气环境中,随着氧化时间的延长,2D C/ SiC 复合材料的阻尼性能先增大后降低;而在 1300°C空气环境中,阻尼性能变化较小,且随氧化时间的延长未表现出明显的规律性。 这是由于 C/ SiC 复合材料的阻尼由炭纤维、热解炭界面和碳化硅基体,以及它们之间的相互作用共同形成。 炭纤维和热解…
In this communication, I present the review on the reported work on gas sensing properties of nanostructured Zinc Oxide (ZnO) thin films and particles. Effect of sintering temperature on structure and granular morphology of nanoparticles is discussed in the context of gas sensing. In case of thin films, effect of 'In'…
In this communication, I present the review on the reported work on colossal electroresistance and resistive switching observed in manganite based heterostructures. Role of inert and active top electrode is discussed in detail. Interface related modifications in resistive switching are explained. Mott transition at in…
Soap is a substance that dissolves in water to remove dirt from surfaces such as skin, textiles and other solids. Soaps are mainly used as surfactants for washing, bathing and cleaning. They are also used in textiles spinning and are important components of lubricants. The present study was carried out to assess the v…
The synthesis and characterization of Al2O3 pillared bentonite have been done and its application as catalyst for esterification reaction were studied. The effect of temperature treatment on the synthesis of Al2O3 pillared bentonite towards its characters were studied by calcinations methods with temperature variation…
El presente estudio se realizó para determinar el efecto de distintas coberturas naturales comestibles sobre la conservación poscosecha de frutos de palto cv. ‘Hass’. Para ello, se utilizó como coberturas comestibles a los productos carboximetil celulosa, goma de tara, almidón de yuca y almidón de papa, en concentraci…
Ce travail vise a determiner le role de la qualite des percages sur les mecanismes de degradation en matage des composites stratifies sous sollicitation de fatigue. Apres une description des phenomenes engendrant les defauts de percage, le choix de criteres pertinents permettant de quantifier la qualite fonctionnelle…
Data on the quality and duration of using permanent dentures made from different structural materials under condition of combination on the teeth antagonists were analyzed. Tribological characteristics of all metal dentures are high, but they do not meet aesthetic and functional requirements and permanent dentures wit…
Concept of a multichannel electron spin detector based on optical imaging\nprinciples and Mott scattering (iMott) is presented. A multichannel electron\nimage produced by standard angle-resolving (photo) electron analyzer or\nmicroscope is re-imaged by an electrostatic lens at an accelerating voltage of\n40 keV onto t…
We study the vibrational properties near a free surface of disordered spring networks derived from jammed sphere packings. In bulk systems, without surfaces, it is well understood that such systems have a plateau in the density of vibrational modes extending down to a frequency scale $ω^*$. This frequency is controlle…
The densities of cardopoly sulfonates are determined by specific volume and floatation methods at 300C. The densities determined by floatation method is found in excellent agreement with calculated values but those determined by specific volume (in different solvents) are not in agreement with calculated values in sam…
As argamassas colantes sao a mistura de cimento e areia, aditivadas com polimeros que retem agua de amassamento e promovem a aderencia, sendo utilizadas na fixacao da cerâmica sobre diversos substratos. A areia utilizada na producao dessas argamassas, proveniente dos leitos dos rios, tem sua extracao submetida a restr…
A fissão (ou cisão) nuclear consiste numa reação em que um núcleo pesado (de Ar > 200) é dividido em duas ou mais partes com massas da mesma ordem de grandeza, habitualmente acompanhadas pela emissão de neutrões, radiação gama e, raramente, pequenos fragmentos nucleares eletricamente carregados.
As partículas β (beta) são eletrões ou positrões de elevada energia cinética emitidos pelos núcleos de certos elementos radioativos (radionuclídeos).
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The aim of this paper is to determine the bulk etch rate of Nuclear Track Detector (type CR-39) using the track’s diameter-length (Le-D) measurement method by irradiating the detector with different energies of alpha particles from 241Am source. Constant normality (6.25) N of the chemical solution NaoH at a temperatur…
Penelitian ini bertujuan untuk mengetahui pengaruh komposisi dari formulasi tamarin, kitosan, dan Vitamin C sebagai campuran pakan buatan terhadap pertumbuhan berat, panjang dan kualitas air. Penelitian dilakukan di Balai Penelitian Ikan Hias, Depok. Penelitian ini menggunakan 4 perlakuan yang berbeda, yaitu kontrol=…
There are examined properties of enzyme systems of actionomycetes Steptomyces chromogenes s.g. 0832, proposed in bio flocculants role for waste water of meat industry treatment. Experimental data demonstrated that optimal results of effluent treatment are observed at temperature and pH range that coincides with range…