Materials Literature
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Cancer is one of the leading causes of death in United States. The current approaches for the treatment of solid tumor available are the surgery for the removal of primary tumor followed by chemotherapy and /or radiation. The efficacy of chemotherapy is limited by the following factors; (1) adverse side-effects on hea…
Cytochemical studies using 1-(4-chloromercuriphenylazo)-naphthol-2 (Mercury Orange), a specific reagent for the detection of sulfhydryl groups, were carried out on the giant multi-nucleated amoeba, Pelomyxa carolinensis. Distribution of -SH groups was compared in normal well-fed organisms, starved amoebas and in sodiu…
This thesis describes a detection system for single molecules based on individual single-walled carbon nanotube field-effect sensors. The sensitivity, spatial confinement and transducer gain of the sensor is derived from a conductance controlled electrochemically created defect, which is also chemically reactive. An a…
Sn-Cu-Ni系合金作为一种低成本的无铅无银钎料愈来愈受到电子封装界的重视。研究了在Sn-0.7%Cu-0.05%Ni(质量分数)合金中添加不同含量(质量分数0.05%~0.50%)的La-Ce混合稀土后钎料合金系的熔化特性、凝固过冷行为、组织演化规律及润湿性能变化。结果表明,添加微量La-Ce混合稀土可明显降低Sn-Cu-Ni系钎料的凝固过冷度,而凝固过冷度的降低使钎料凝固时初生η-(Cu,Ni)6Sn5块状金属间化合物(IMC)相的生长得到抑制,同时钎料中β-Sn相形态由树枝晶逐渐转变为等轴晶;润湿角测定结果表明,La-Ce混合稀土添加量为0.05%时,钎料在Cu基板上呈现优良的润湿性能。
开发了新型反应体系,以硼砂(Na2B4O7.10H2O)和K2ZrF6粉剂为原料采用熔体直接反应法,在铝熔体中成功制备了原位纳米Al2O3颗粒增强铝基复合材料。借助于扫描电镜(SEM)、X射线衍射(XRD)、透射电镜(TEM)等测试方法,对复合材料的相组成和微观组织进行了分析,结果表明反应生成了纳米级γ-Al2O3颗粒增强相,尺寸约为20～100nm,并在铝基体中均匀分布,Al2O3颗粒在熔体中的形成机制为反应—溶解—析出;复合材料中Al基体与γ-Al2O3颗粒界面处结合良好,具有γ-Al2O3(040)∥Al(200)的晶体位向并形成共格关系;复合材料基体中由于原位纳米Al2O3颗粒存在形成了大量位错,有利于材料性能的强化。
Heavy ion irradiation effects on optical and structural properties of Kapton-H polymer have been investigated. The polymer Kapton-H of 13 μm thickness was irradiated to 172 MeV Ag[superindice 13+] ion using 15UD pelletron at IUAC, New Delhi. The changes induced in optical and structural properties are discussed by usi…
合成了一种新的配合物[Co（Im）6]·（CF3COO）2（Im=Imidazole）,并用X射线衍射分析、核磁共振氢谱和红外光谱对其结构进行了表征.结果表明,该配合物属于单斜晶系,空间群为P21/c,晶胞参数为a=1.086 3（2）nm,b=1.779 0（4）nm,c=0.789 38（16）nm,α=90°,β=96.56（3）°,γ=90°,V=1.515 6（5）nm^3,Z=2,Dc=1.520 Mg/m^3,μ=0.654 mm-1,F（000）=706.其中心离子Co（II）具有典型的八面体配位构型.在固态时,配合物形成的三维氢键网络使晶体结构更加稳定.
Ces travaux portent sur la modélisation de l'endommagement ductile de matériaux métalliques. Un modèle d'endommagement continu à base micromécanique a été mis point. L'originalité de celui-ci est qu'il incorpore des effets d'inertie liés aux mouvements de matière à l'échelle de microstructure du matériau. Ce modèle a…
The effects of the substrate temperature on the deposition and microstructure of the 304 stainless steel (SS) cold gas dynamic spraying (CGDS) coatings were investigated. It was found that the higher substrate temperature could increase the deposition rate of the 304 SS particles,even the oxide films existed at the in…
Chiral metamaterials are artificial structures that can achieve much stronger optical activities than natural materials. In this thesis I will focus on the fabrication and characteristic of the chiral metamaterials in visible range. I have fabricated chiral samples by multi-step electron beam lithography, electron bea…
我们以往的常识，所有的固体不是晶体就是非晶体。石蜡就是典型的非晶体代表，没有固定的熔点，其中的分子排列杂乱无章。冰和铁则是晶体的代表，它们都有着固定的熔点，其中的质点（原子或者分子）的分布都是有序的。
Epoxy resins have shown outstanding material merits of low cost, ease of processing, fine adhesion to many substrates and good chemical resistance with a wide range of applications such as adhesives, construction materials and composite laminates. Nanofillers such as carbon nanotubes (CNTs), nanosilica and nanoclays p…
Solution processed bulk heterojunction (BHJ) organic solar cells (OSCs) have gained wide interest in past few years and are established as one of the leading next generation photovoltaic technologies for low cost power production. Power conversion efficiencies up to 6% and 6.5% have been reported in the literature for…
Karla J. Medina-Ortega, Luis A. Cañas; SCREENING FOR WHITEFLY RESISTANCE IN POINSETTIAS, SUMMER 2006, Arthropod Management Tests, Volume 36, Issue 1, 1 Jan
Understanding the nucleation and growth process of crystalline phases via electrocrystallization (EC) is of significant interests due to its application in producing thin films of metals and oxides for the fabrication of alloys, nano-particles, integrated circuits and magnetic recording devices with high degree of sel…
In the study of the distribution of organo-clay complexes, thirty-four samples representing eight soil types were collected from the Lower Fraser Valley and the effectiveness of the three methods, viz. simple dispersion, insonation and chelating resin were examined. The use of a chelating resin was found most effectiv…
On the basis of experimental researches executed on samples from a titanic alloy, it is shown that the factor influencing development of physical contact and quality of diffusive connection is the microstructure of welded preparations. As a result of processing of experimental data expression describing kinetics of de…
For the plane strain state the special mathematical models was reviewed. These mathematical models allows to select a group of equations closed by stress and does not contain the kinematic quantities. The analytical solution for the problem of axisymmetric tube balance from compressible elastic material was described
Fabrications of desirable fixed or removable dental prostheses depend upon accurate casts or dies. Recently, the most frequently used impression materials have been polyether (PE) and polyvinyl siloxane (PVS). However, both have their limitations: PVS is inherently hydrophobic, and PE is rigid. In order to take advant…
本文主要证明当K是数域,G是有限群,V是KG—模时,V的换位代数D=HomKG(V,V) ≌K蕴含V不可约,即Schur引理的逆定理:进一步,V在复数域C上的标量扩张C(×)kV是不可约CG—模当且仅当D≌K.