Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
This report accounts for investigations of ways to reduce the calculation times forsimulations of falling control rods in boiling water reactors done prior to everyreactor startup, known as RIA-calculations. Two methodologies to lower thecalculation times have been proposed, developed and implemented in a set ofmatlab…
以Ag-Cu—Ti合金为钎料钎焊连接C／C复合材料与钛合金（TC4），通过SEM对钎焊连接接头的微观组织和形貌进行分析，用EDS和XRD分析接头中的元素分布和物相组成．实验结果表明，中间钎料层与TC4合金之间的界面，形成了良好的界面扩散层，厚度为5～7μm，与TC4钛合金连接侧的钎料相组成主要为CuTi2，CuTi和Cu3Ti2；钎料层与C／C复合材料形成的扩散层厚度为1～3μm，与C／C复合材料连接侧的钎料相组成主要为CuTiz和CuTi．C／C复合材料与TC4合金之间形成了冶金结合．
实验先用磷酸和钼酸盐合成磷钼杂多阴离子，再通过控制金属种类、pH值及温度，及与有机配体和物料比进行实验，最终制备出五钼二磷酸盐配合物（H2bpy）0．5{[Co（H2O）5][Co（Hbpy）（H2O）4][Mo5P2O23]}并通过IR和X-单晶衍射法进行表征，表征结果与现有文献记载相吻合．成功找到制备五钼二磷酸盐配合物的新条件：（1）温度为160℃左右，pH在4．2—4．5之间；或（2）温度为140℃，pH为3．1—3．5之间，反应3d，均可制备五钼二磷酸盐配合物．
In article mathematical modeling of process of formation screw rift on an internal surface of a glass by means of a profile punch through a cylindrical matrix by a reduction method, with use of the program QForm 2D/3D complex is considered. The main regularities are revealed.
The probably isosymmetric and deformational modifi cations of С nanostructures with atomic covers of18trigonal branch of fullerene’s classification and the possible influence onto tribologic properties of the compositional coatings were discussed.
以Ti(OC 4 H 9 ) 4 、CH 3 COOLi·2H 2 O和GeO 2 为原料, 采用溶胶-凝胶法合成了尖晶石型Li 4 Ti 5- x Ge x O 12 ( x =0、0.05、0.1、0.15)电极材料。通过X射线衍射(XRD)、扫描电镜(SEM)、充放电测试、循环伏安(CV)以及交流阻抗对材料进行结构、形貌及电化学性能表征。研究结果表明, 适量Ge 4+ 掺杂不会改变Li 4 Ti 5 O 12 的尖晶石结构, 但对其颗粒尺寸和形貌均产生影响。由于掺Ge 4+ 后样品的颗粒尺寸减小, 使得Ge 4+ 掺杂Li 4 Ti 5 O 12 倍率性得到不同程度的提高。其中Li 4 Ti 4.9 Ge 0.1 O 12…
采用固相法制备Bi1.5-xEuxMgNh1，07（x=0、0．1、0．2、0．3、0．4、0．5和0．6）陶瓷。采用X线衍射仪（xRD）、扫描电子显微镜（SEM）和阻抗分析仪分别对陶瓷的相结构、显微结构和介电性能进行表征。结果表明：当Eu^3＋取代量（x）较小（x≤0．5）时，所有组分的陶瓷样品均保持单一的焦绿石相；当x=0．6时，样品出现少量的EuNb0。杂相。随着Eu^3＋取代量的增加，陶瓷的介电常数逐渐减小，介电损耗先减小后增大，温度系数显著增大。当x=0．5时．1MHz下测得的介电常数为96，介电损耗为3．8×10^-4，温度系数变成一12×10^-6℃^-1。因此，通过适当的Eu“取代可以获得适用于I类多层陶瓷电容器性…
层析硅胶负载Zr（SO4）2经高温焙烧制得一种新型固体酸Zr（SO4）2／SiO2催化剂，考察其在合成乙酸正丁酯反应中的催化活性．获得制备固体酸与催化合成乙酸正丁酯的优化工艺条件分别为：Zr（SO4）2的负载量0．5mmol／g、焙烧温度450℃；醇酸物质的量比1．5，催化剂用量1．0g（相对0．1mol冰乙酸），反应时间为2．0h，优化条件下的酯化率可达99．3％．实验结果表明，固体酸Zr（SO4）2／SiO2具有良好的酯化催化活性，且反应后处理简单，不腐蚀设备，属环境友好型催化剂．
Thesis (S.M. in Inorganic Chemistry)--Massachusetts Institute of Technology, Dept. of Chemistry, 2013.
This document describes work performed related to the determination of how elemental additions affect the interfacial fracture toughness of thermal barrier coatings at the bond coat/thermally grown oxide interface in gas turbines. These turbines are exposed to cyclical thermal loading, therefore a simulation was desig…
This research is subjected to investigate the effect of increasing cantula fiber's length to impact strength, bending strength, and density of HDPE fiber composite through pressured sintering process. HDPE in this research was made from recycling plastic bottles, rubber was taken from SBR motor's tire, and fiber was t…
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2013.
Silicon based integrated circuits has been dominating the electronics technology industry in the last few decades. As the telecommunications and the computing industry slowly converges together, the need for a material to build photonics integrated circuits (PIC) that can be cost-effective and be produced in mass mark…
Kualitas pembubutan logam sangat dipengaruhi oleh jenis pahat bubut yang digunakan, seperti misalnya pahat bubut high speed steel(HSS), boron Karbida, dan pahat polycristaline diamond (PCD). Karena perbedaan sifatsifat fisik dari HSS , boron karbida dan PCD maka kekasaran permukaan yang dihasilkan pun berbeda. Sangatl…
Protease adalah enzim yang dapat menghidrolisis ikatan peptida pada protein. Aktivitas protease merupakan kemampuan enzim protease untuk memecah protein. Penelitian ini bertujuan untuk mengetahui aktivitas protease dan gambaran histologi pada ginjal tikus ( Rattus norvegicus ) pasca induksi Cyclosporine-A (CsA). Ginja…
The aim of this Master thesis was to investigate if the xylan content had any influence on the physical properties of softwood kraft pulps. To achieve pulps with different xylan content different kraft cooking conditions were used; two different temperatures and two different effective alkali levels.The cooking condit…
Growing demands for increased functionality in consumer electronics and for information technology-enabled services in various sectors have resulted in the rise of high-performance multiprocessor system-on-chips (MPSoCs) and three-dimensionally stacked integrated circuits (3D ICs), that are deployed in various electro…
In this study, we investigate the output maximization of salient-pole synchronous machines by using small amount of Nd-Fe-B magnets. First, the mechanism of output increase by the additional magnets is revealed by using both finite element method and simple magnetic circuit. Then, the appropriate magnet shape and roto…
The mechanism of hydrogen plasma passivation for poly-crystalline silicon(poly-Si) thin films is investigated by optical emission spectroscopy(OES) combined with Hall mobility,Raman spectra,absorption coefficient spectra,and so on.It is found that different kinds of hydrogen plasma radicals are responsible for passiva…
Four structural isomers of platinum(II) complexes with C-deprotonated R-C^N^N-R’ cyclometallated ligands (R-C^N^N-R’ = -extended 6-aryl-2,2’-bipyridine derivatives containing 2-naphthyl, 3-isoquinolinyl, 1-isoquinolinyl or 2-quinolinyl moieties) have been synthesized with their photophysical properties investigated.…