Materials Literature
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采用锥形量热仪、烟密度仪和电导率测定法研究了Mg（OH）2对聚氯乙烯（PVC）燃烧特性的影响,并探讨了体系中HCl的释放规律以及能体现出协同效应并最大限度降低HCl生成量的复配法。结果表明：将Mg（OH）2加入到PVC中后,PVC的起始分解温度略有提高,体系残炭量较纯PVC明显增加,促进了PVC的热解,有利于PVC形成炭骨架;Mg（OH）2加入后在300～500 s内使烟对光吸收率和热解质量损失都达到最大,在500 s后开始呈现下降趋势,将其与Sb2O3混合能产生极大的阻燃协同效应,烟对光吸收率最大值、烟对光吸收率平均值及热解残留物质量分别为Sb2O3的6.38%,10.34%和1.32倍;Mg（OH）2能使体系的HCl释放总量减…
膜厚均匀性是评价光学薄膜的重要标准之一。膜厚均匀性不好,膜系特性就会遭到严重破坏。作为用于光学薄膜的主要低折射率材料,SiO 2 导热性很弱,且以升华的方式进行蒸发,具有特殊的蒸发特性,导致在利用电子束加热蒸发方式镀膜的过程中,膜厚分布会发生明显变化,从而严重影响薄膜质量。为了分析SiO 2 材料蒸发特性对膜厚均匀性的影响,对电子束焦斑热量分布进行了计算模拟,据此得到蒸发质量的分布。根据蒸发质量分布和蒸发源表面各点蒸发角的变化,计算了蒸发源在空间球面和空间平面上的分布。根据分析结果,总结了SiO 2 材料蒸发特性对膜厚均匀性产生影响的原因及膜厚分布的特点,为调整和改进SiO 2 材料镀膜工艺提供参考。
Este trabajo presenta un resumen de prospectiva sobre la idoneidad y viabilidad técnica de incorporar y sintetizar nanopigmentos para realizar tintura de fibras sintéticas y fibras naturales en CO2 supercrítico (scCO2) con el objeto de plantear futuras líneas de investigación que posibiliten el empleo de esta técnica…
让 M 一关门积极部分弯曲 n 歧管。假设 M 与 p 素数承认有效等大的 T1 脳 p k 行动。如果，文章的主要结果是那为 n=3 或为 n 鈮 ? 的 k=1 5，那么在那里存在积极经常的 p (n) ，仅仅取决于 n，以便蟺 1 (M) 是周期的如果 p 鈮 ? p (n) 。
This dissertation describes the electrical percolation and resistive switching behaviors of silver nanowire-polystyrene composites, which represent the first measurements of electrical percolation and resistive switching in bulk polymer composites containing finite-L/D cylinders. The measured percolation thresholds (&…
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2010.
Electron Cryo-Microscopy or cryo-EM is an area that has received much attention in the recent past. Compared to the traditional methods of X-Ray Crystallography and NMR Spectroscopy, cryo-EM can be used to image much larger complexes, in many different conformations, and under a wide range of biochemical conditions. T…
The results of loading cycles parameters forming of fuselage elements covering stringer of Mill 26T helicopter during the fatigue test preparations are submitted. The loading is reproduced by three different methods: the Ground -Air Ground cycle; Oding method; with the use of block-program.
Este trabalho tem por finalidade a análise dos parâmetros de soldagem do processo com eletrodo tubular com proteção gasosa (FCAW-G – Flux Cored Arc Welding Gas-Shielded) sobre as características geométricas do cordão de solda (largura do cordão, altura do cordão e penetração). As variáveis do processo analisadas foram…
Il presente lavoro di tesi riguarda la sintesi di nanopolveri allumina-zirconia, seguendo tre differenti metodologie (sintesi per coprecipitazione, sintesi con il metodo dei citrati, sintesi idrotermale assistita da microonde) e il trattamento termico (calcinazione) delle polveri ottenute, mediante tecniche di riscald…
采用机械合金化结合热压的方法,制备了纳米晶（Mg0.97X0.03）3Sb2（X=Mg、Cr、Cu、Ti）,进行了微结构表征和电阻率测量。结果表明其平均晶粒尺寸不超过40nm。（Mg0.97X0.03）3Sb2晶体结构四面体位置的Mg-Sb结合距离变短,共价性增强。室温电阻从543Ωcm（Mg3Sb2）下降到137Ωcm（（Mg0.97Cr0.03）3Sb2）、121Ωcm（（Mg0.97Ti0.03）3Sb2）、109Ωcm（（Mg0.97Cu0.03）3Sb2）。替代样品的电阻在低温时为变程跳跃电导。电阻率的降低是由于替代形成的晶格中化学环境变化,原子间结合强度增加所致。
有 nanobelt 结构的磷灰石涂层被电极淀积的一个二拍子的圆舞方法在 150180 点与 DC 力量和蒸汽热的处理(VTT ) 在 1.0-2.0 mA/cm2 在单个水晶硅上制作 ?怰 吗？？
Scientists at the Chemical Dynamics Beamline of the Advanced Light Source in Berkeley are continuously reinventing synchrotron investigations of physical chemistry and chemical physics with vacuum ultraviolet light. One of the unique aspects of a synchrotron for chemical physics research is the widely tunable vacuum u…
The addition of rare earth element yttrium played an important role in the improvement of both mechanical properties and wear resistance of Al2O3/(W,Ti)C ceramic cutting tool material.Mechanical properties especially the fracture toughness and flexural strength were obviously increased when a suitable amount of the yt…
为商业地制作的合金的三种典型产品状态的微观结构 2195 被观察。热转动的板被包含罚款的含纤维的结构描绘，这被发现， polygonized 基础；并且滚动寒冷的表被包含高密度脱臼房间的 pan-caked 谷物结构描绘。脾气被证明包含大量散、塑造板的 T1 (Al2CuLi ) 的在近的山峰老化下面的产品猛抛，和 theta 的小部分；“(Al2Cu ) 盘子，展出机械性质的理想的联合。用扫描电子显微镜学的分析表明许多粗糙的、不规则形状的 Al7Cu2Fe 成分粒子处于所有产品状态存在，它显示中间的热处理几乎没在这个引起铁的、有害阶段上有小影响。为合金 2195 的不同产品状态的微观结构的形成和进化在商业生产条件的看法点被讨论。
采用CHCl3-TBAB有机溶剂的新体系,在低电压下电化学还原氯仿沉积了金刚石和类金刚石碳。研究了铂电极和化学沉积Ni-Co合金电极等电极材料和N,N-二甲基甲酰胺（DMF）和丙烯碳酸酯（PC）等溶剂体系对沉积产物的影响.研究结果表明,Ni-Co合金电极对金刚石沉积的催化效果优于Pt电极,PC更有利于金刚石的沉积.
Thesis (Ph. D.)--Harvard-MIT Division of Health Sciences and Technology, 2010.
"Lindackeria paludosa (Benth.) Gilg is a shrub found mainly in the north of South America and is known as Sarakura in Venezuela. In the light of local reports on the traditional use this member of the Flacourtiaceae family, we investigated the effect of a hydroethanolic extract of the bark (LP) on parameters of the in…
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This study has been mainly focused on high temperature solid oxide electrolysis cells (HT-SOECs) for steam electrolysis. The compositions, microstructures and metal catalysts for SOEC cathodes based on (La₀.₇₅Sr₀.₂₅)₀.₉₅Mn₀.₅Cr₀.₅O₃ (LSCM) have been investigated. Hydrogen production amounts from SOECs with LSCM cathod…