Materials Literature
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We observed stress dependence of the energy of np excitons in Cu2O by linear absorption spectroscopy. The energy shift of np states agrees well with calculations using modified coefficients under symmetry considerations.
Les travaux de recherche effectués dans cette thèse s'inscrivent dans le cadre de l'étude du comportement non linéaire sous application d'une contrainte extérieure sur des céramiques PMN-25PT et des monocristaux PZN-4.5PT à symétries rhomboédriques. Ces matériaux sont utilisés pour différentes applications (actionneur…
ZusammenfassungIn diesem Kapitel wird ein Überblick über die in der Medizin und Technik wichtigen Strahlungsarten und ihre Eigenschaften gegeben. Strahlungen werden in Korpuskular- und Photonenstrahlungen eingeteilt, die sich vor allem durch das Fehlen einer Ruhemasse bei den Photonen unterscheiden. Beide Strahlungsar…
Hiroyuki NISHIKAWA*, Momoka HIGA, Ryusuke KONDO, Sei-ichi KAGOSHIMA, Akiko NAKAO, Hiroshi SAWA Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan Department of Basic Science, University of Tokyo, Kobama, Tokyo 153-8902, Japan Institute of Materials Structure Science,…
We report measurements of the attenuation of ~100 GHz coherent acoustic phonons in silicon and results are compared with existing theory. The results have implications for nanoscale thermal transport models and novel acoustic imaging schemes.
A series of CuO/ZnO/Al2O3 nanocrystalline solid catalysts were prepared by the coprecipitation method at constant temperature. The effect of the change in pH, chemical composition and thermal treatment for all the prepared solids on the physicochemical, surface and catalytic properties was investigated. The crystal st…
A high temperature combustion method was used to analyze the 14 C and 3 H activities in graphite and the dose assessment was carried out to determine the clearance in the conservative way. By this method, the 3 H and 14 C were simultaneously trapped in the nitric acid and carbosorb, respectively. Accordingly, the samp…
This is the first time that we reported about dual target inhibitors of KU86 and XRCC4. XRCC4 was well known as the downstream of KU86-DNA complex. They both play an important role in the DNA double-strain breaks (DSBs) repair system subpathway, non-homologous end joining (NHEJ).In this study, The protocol of docking…
We report a CMOS-compatible low-temperature process for electrostatic MEMS scanner with highly reflective photonic crystal mirror in the near IR region. The photonic crystal was made in the EB-evaporated amorphous silicon layer deposited on the MEMS scanner. The reflectivity was found over 90 % at 1.55 mum wavelength.…
In polycrystalline shape memory alloys at equilibrium under a prescribed loading, one typically observes the formation of austenite/martensite microstructures in each grain. The prediction of the resulting effective energy is a difficult question that still remains largely open. A related problem is the prediction of…
The fabrication conditions of high-density fluorapatite (Ca10(PO4)6F2: FAp) ceramic material with submicrometer sized grains were examined by two different techniques, namely pressureless firing and pulse-current pressure firing. Firstly, FAp compact was pressurelessly fired at a temperature between 1000 and 1200 °C f…
A literature study report covering the topics; micromechanics of damage, continuum damage mechanics (gurson model and effective variable concept) and the dependence of damage on strain rate and temperature.
多晶的 Nd 的合成: 借助于液体的 Sr0.95Ba0.05WO4 -- 并且稳固阶段的反应被报导。X 光检查粉末衍射结果出现了成长得当的 Sr0.95Ba0.05WO4 和 Nd：Sr0.95Ba0.05WO4 单个晶体属于四角形的系统和 I41/a 空间组。透明 Nd：Sr0.95Ba0.05WO4 单个水晶能被 Czochralski 方法从综合多晶的材料沿着 c 轴获得。当 Sr0.95Ba.005WO4 单个水晶的发射度能到达 80% ， Nd3+ 离子被采用被做进单个水晶。多晶的材料和单个水晶的自发的拉曼系列被 RERKZN-ELMER2000 和 JY-HR800 测量。被在 Sr0.95Ba.005WO4 单个水…
Lack of fresh and clean drinking water is a problematic issue for many people worldwide. The water quality in some streams in Malawi, situated in south east Africa, has recently been investigated. The study shows that the concentration of several heavy metals exceeds the guideline values in drinking water set by WHO.…
We investigate the application of porous silicon (PS) in the field of the photovoltaic. In first step we realise a double porous silicon layer by electrochemical anodisation using two different current densities. The low current leads to a low porosity and during annealing, the recrystallisation of this layer allows e…
The synthesis and liquid crystalline properties of some new multisubstituted triphenylenes are reported. The materials bear combinations of alkyne and alkoxy substituents and were designed to probe the structural factors controlling mesophase formation, type and stability in triphenylene discotics. A combination of fa…
Co-continuous metal/ceramic composites (or C 4 ) were obtained by Reactive Metal Penetration starting from commercial cordierite preforms. The infiltrating alloys were chosen to be 1050, 2011 and 7075 standard aluminium alloys, with increasing content of alloying elements The kinetics of infiltration was studied, toge…
By way of hydrophobic coating on the exterior and interior surface of silicon photonic crystal, color of silicon photonic crystal can be changed with a sub-second response time via liquid infiltration and exfiltration.
In spite of several attempts at synthesizing MnNb2S4, a II− −III2−VI4 semiconducting material with potentially interesting magnetic properties, MnNb3S6, a closely related compound was always prepared as the majority phase. The material was characterized using X-ray Powder Diffraction data. The refinement of the struct…
The aim of this deliverable is an improved model for the influence of vehicle conditions on the loading and subsequent deterioration of rails. In particular, this report focuses on:1.Wear data from SUROS twin-disc tests with CORUS 260 and premium grade pearlitic rail steels (CORUS 400, VA 350 and VA 400), and metallur…