Materials Literature
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Modern iron and steel industry is based on the iron -carbon diagram. However, a major problem associated with Fe-C alloys is that they corrode and cause losses to the tune of 5% of GDP to the world. Ancient Indian iron (Fe-P-C) artifacts like the Delhi Iron Pillar have withstood atmospheric corrosion for about 1600 ye…
There are two analytical concepts which have been widely used in investigating fatigue crack growth (FCG) under variable amplitude loading (VAL). One is crack-closure concept and the other is known as residual models.[1-2]. The current article emphasises the importance of the parameter p calculation as a micro-support…
En aquest article es presenten els nanotubs de carboni, descoberts al final del segle passat i que estan esdevenint un dels materials mes prometedors en l'ambit tecnologic. Es dona una visio general sobre els diferents metodes de sintesi i de purificacio i es destaquen les extraordinaries propietats d'aquests nous mat…
Cu-Ni-Si 合金的降水行为被分析电的电导率的变化在老化期间学习。阶段转变动力学的 Avrami 方程和电的电导率的 Avrami 方程为 Cu-Ni-Si 合金在老化期间被建立，根据在电的传导性和体积部分之间的线性关系猛抛，并且计算结果与实验与一致很好。转变动力学曲线被建立描绘变老的过程。特征在使过饱和的稳固的答案合金猛抛在 723 点， K 被建立，并且结果证明 precipitates 是 -Ni3Si 和 -Ni2Si 阶段。
Mechanics, the science of forces and motions, has numerous engineering applications. These applications have been achieved through a proper blending of the principles of mechanics with certain postulates and assumptions based on experiments and experience. Solid mechanics deals with the mechanical behavior of the defo…
The descriptions of biophysical events from heavy ions are of interest in radiobiology, cancer therapy, and space exploration. The biophysical description of the passage of heavy ions in tissue and shielding materials is best described by a stochastic approach that includes both ion track structure and nuclear interac…
将Native制备电泳应用于Rhizopus microsporus var．chinensis中2个葡萄糖淀粉酶同工酶的分离，考察了电泳缓冲系统、凝胶浓度和凝胶长度对分离效果的影响。结果表明：先使用Ornstein-Davis系统分离同工酶，再使用0，02mol／L，pH6．2的NaAc·CH3COOH缓冲液洗脱，在长度为6cm的7％的Native电泳胶上，2个性质相近仅电泳迁移率略有羞别的同工酶能有效分离。分离回收的蛋白质可保持其活力，便于后续研究。
As the Si-CMOS technology approaches the end of the International Technology Roadmap for Semiconductors (ITRS), the semiconductor industry faces a formidable challenge to continue the transistor scaling according to Moore’s law. To continue the scaling of classical devices, alternative channel materials such as SiGe,…
HTML clipboardIn this thesis, dynamic effects on electron transport in molecular electronic devices are presented. Special attention is paid to the dynamics of atomic motions of bridged molecules, thermal motions of surrounding solvents, and many-body electron correlations in molecular junctions. In the framework of s…
采用提拉法生长了尺寸为20mm×30mm的Er3＋/Yb3＋∶Sr3La2（BO3）4晶体,研究了Er3＋/Yb3＋∶Sr3La2（BO3）4晶体的吸收光谱和荧光光谱。根据Judd-Ofelt理论分析并计算了辐射跃迁几率、辐射寿命、荧光分支比等光谱参数,获得的唯象参数为：Ω2=15.59×10-20cm2,Ω4=2.25×10-20cm2,Ω6=1.49×10-20cm2。在Er3＋/Yb3＋∶Sr3La2（BO3）4晶体中Er3＋在1533nm处发射跃迁截面为7.88×10-21cm2,Er3＋的4I13/2→4I15/2能级跃迁的荧光寿命和辐射寿命分别为0.728ms和4.24ms,结果表明Yb3＋对Er3＋有敏化作用,提高…
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…