Materials Literature
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我们调查连接不同宽度的扶手椅 graphene nanoribbons 填写了的Ｔ形的运输性质。连接几何学的三种类型被考虑。连接传导力强烈取决于连接几何学的原子特征。当连接的肩膀有之字形类型边时，锋利的传导力回声通常在迪拉克点，和传导力差距附近出现在低精力区域出现。当连接的肩膀有扶手椅类型边时，传导力回声行为显著地被削弱，并且 metal-metal-metal 连接结构显示出 semimetallic 行为。接触抵抗也尤其是由于连接的各种各样的接口几何学变化。
Neste trabalho é desenvolvido um dispositivo automático para a soldagem de tambores enroladores de talhas elétricas e avalia-se seu desempenho em comparação ao processo de soldagem anteriormente utilizado. Os tambores são compostos de tubo mecânico com fechamento de chapas de aço carbono ASTM A-36, sendo essas as uniõ…
采用铜模吸铸法制备直径为5mm的Zr53．5Cu26．5Ni5Al12Ag3,用电化学极化曲线方法考察该大块锆基非晶合金及相应的晶态合金在55℃中性盐雾气氛下腐蚀120h的腐蚀行为，并用金相显微镜、SEM和EDS对腐蚀前后试样的表面形貌和成分进行观察与分析．极化曲线测试结果表明，在55℃中性盐雾气氛下，大块锆基非晶合金比相同成分的晶态合金具有更好的耐盐雾腐蚀性能，腐蚀120h后，Icorr=9．922×10-7A／cm-2，比同条件下的晶态合金小3个数量级．SEM分析表明非晶合金表面没有发生明显的腐蚀，表面保持光洁．EDS分析表明非晶合金腐蚀产物为Al的氧化物，相应的晶态合金表面腐蚀产物为Al和Ni的氧化物．
从三个方面综合介绍了本课题组近几年来采用Fe-Ni-C系在高温高压下合成优质金刚石单晶的研究成果：1）采用单质金属铁、镍粉和石墨粉以及粉末冶金方法制备出新型铁基触媒,利用六面顶压机合成了高品位的金刚石单晶;2）采用现代分析测试方法对金刚石单晶外的金属包覆膜物相结构进行了系统表征和分析;3）基于固体与分子经验电子理论（EET理论）和托马斯-费米-狄拉克-程开甲理论（TFDC理论）对金刚石合成过程中相关物相（金刚石、石墨、Fe3C（（Fe,Ni）3C）和γ-（Fe,Ni）等）的价电子结构进行了计算和论证。实验分析与理论研究结果表明,单质金属粉辅以粉末冶金方法同样可以实现高品位金刚石单晶的合成;金属包覆膜中存在大量的Fe3C、（Fe,N…
In recent years, nonvolatile memory with nanocrystals cell have been widely studied to overcome difficulties occurring to of operation and reliability of conventional floating gate memory. Desirable electrical characteristics of memory devices include the following criteria : low power consumption, high-speed operatio…
Um conjunto de endurecedores de resinas epoxídicas do tipo aminas alifáticas foram caracterizados por titulação potenciométrica. Os endurecedores correspondem a compostos de cadeia linear: etilenoamina (EDA), dietilenotriamina (DETA), trietilenotetramina (TETA), tetraetilenopentamina (TEPA), e compostos de cadeia cícl…
toluminescence W center and the centers's origin in ion-implanted silicon crystals, Appl. Phys. Lett., 72, 11,(1998), 1347-1349 [6] Coomer B. J., Goss J. P., Jones R., Osberg S., Briddon P. R.: Physica B, 273-274, (1999), 505-508 [7] Pierreux D., Stesmans A.: Phys. Rev. B, 71, 5, (2005), 115204-115208 [8] Schultz R J.…
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Nuclear Science and Engineering, 2010.
现在的工作集中于把演员组渗入与热喷洒的技术相结合改进镁合金的表面腐蚀抵抗的一个新方法。基于锌的合金层在 AZ91D 镁合金的表面上被制作。层的微观结构被扫描与一个精力装备的电子显微镜学描绘散 X 光检查光谱学(版本) 。这些合金的阶段成分被 X 光检查 diffractometry (XRD ) 识别。分析结果表明有 700 m 的厚度的基于锌的合金层能在 AZ91 合金矩阵的表面上形成。层由 Mg7Zn3， MgZn 和 -Mg 固体答案的小数量组成。在为 240 h，和层沉浸于 5% NaCl 答案为 AZ91 合金是更保护的以后，结果显示没有层，有基于锌的合金层的标本的腐蚀抵抗是比标本的好一些的。
Step 5: The dried rods are placed in a supercritical CO2 chamber (under 850 psi) for 6 hours. Purpose of step: the PLGA material foams and expands to take on desired properties Advantages of scCO2 •Inexpensive •Sterilization of samples •Extraction of solvent •Microsphere fused nerve conduits ensure an equal distribut…
The advanced model and technique of strength calculation of construction elements produced from eutectics composites as the example of gas turbine rotor blade are given. The base for theoretical calculation of mechanical and thermophysic characteristics of blade eutectic composite materials is the electrostatic nature…
The material and photovoltaic properties of a new class of conjugated polymers was investigated. These two new polymers; poly (3,4-didodecylthiopene vinylene)-2,6-diyl benzo [1,2-d; 5,4-d'] bisoxazole] (cis-DD-PTVBBO) and poly (3,4-didodecylthiopene vinylene)-2,6-diyl benzo [1,2-d; 4,5-d'] bisoxazole] (trans-DD-PTVBBO…
在水的解决方案的碳 nanotubes (CNT ) 的导致光的凝块的动态进程， C60 和 Escherichia coli (E.coli ) 用一个光镊子系统被表明。与增加的激光力量基于结果，聚结的区域的直径和凝块率增加。在浸透马厩时期以后， CNT 完全扩散， C60 簇仅仅部分扩散，并且 E。coli 从来不在凝块区域扩散。理论分析证明分子的极化和粒子的热散开在散开过程起关键作用。结果显示使用光聚集并且排序 nanoparticles 的可能性。[从作者抽象]
The synthesis of poly(amide-ester-imide) containing photosensitive cinnamate groups whose structure was confirmed by FTIR spectroscopy (Fig. 1.) has been presented. After deposition of the synthesized polymer on a glass support, it was subjected to thermal imidization (Fig. 2.) and then to UV irradiation in the 250—38…
一个简单电气化学的方法为在里面有高度面向的 pyrolytic 石墨(HOPG ) 上的控制尺寸的同类地驱散的 gold-polyaniline 核心 / 壳 nanocomposite 粒子的 situ 准备被表明。HOPG 表面被采用重氮基化学的二维的 4-aminophenyl 单层结合的共有原子价优先地修改。AuCl4？离子被纳入 Ar-NH2 结束并且电气化学地减少了。这导致能进一步成年进金 nanoparticles 的 Au 原子核的形成。polyaniline 的形成 Au 作为壳包 nanoparticle 被局部性的电镀物品聚合建立。准备的这些核心壳 nanocomposites 被 AFM 和周期的 volt…
将Ag-Rh浸渍到共沉淀法合成的Ce-Zr-Al上,制备出Ag（0.04）-Rh（x）/Ce0.5Zr0.5O2-75%Al2O3系列催化剂,采用BET比表面积、X射线衍射光谱（XRD）和原位漫反射傅里叶变换红外光谱（DRIFTS）对催化剂进行表征,并探讨催化剂在贫燃条件下选择性还原NO的活性和反应机理.结果表明,Ag-Rh双组分催化剂的活性较单组分Ag、Rh催化剂的高.Rh负载量为0.7%（质量分数）时,NO转化率达最佳（90.3%）,且反应的起燃温度低、活性温度范围宽（300～500℃）.DRIFTS结果显示,Rh的添加不仅有利于催化剂表面NO的吸附,而且能促进Ag催化生成关键反应中间体—CO—NH—,进而显著提高NO的转化率.
Questions of maintenance of a correctness and quality of adjustment microprocessor proportional-integral-derivative regulators on an example of system of microprocessor regulation of temperature air in a pigsty-otkormochnike on 2176 places complex for pigs, the Stavropol project institute Stavropolagropromproekt execu…
La poursuite de la diminution des puissances requises dans les composants electroniques a pousse a une miniaturisation a l'extreme des composants existants. De nouveaux phenomenes physiques tel que le blocage de Coulomb apparaissent, permettant de nouvelles fonctionnalites. Les composants RF agiles en frequence utilis…
Describing interstitial atoms in intermetallics or simple mono-atomic close-packed metals is a straightforward procedure in common full-potential calculations. One establishes a sufficiently large supercell, introduces the interstitial impurity and performs the electronic structure and total energy calculation. Real s…
When designing, testing and operation of blade machines (compressors, turbines) solve various problems, which uses the characteristics blade rows (impellers and guide vanes), stages, multistage compressor (cascades). Highlighted the problem of determination of the required geometry (construction) of a given thermodyna…