Materials Literature
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In this work, ultraporous silica layers with very low refractive indices (1,1-1,2) and thicknesses about one micrometer are prepared and integrated to two systems of sensors for different applications. The synthesis of the initial solution is optimized from the sol-gel standard two steps. Due to its high porosity, the…
从不同的视角回顾和研究了AlGaN/GaN HFET的二维电子气（2DEG）和电流崩塌问题。阐述了非掺杂的AlGaN/GaN异质结界面存在2DEG的原动力是极化效应，电子来源是AlGaN上的施主表面态。2DEG浓度与AlGaN/GaN界面导带不连续性、AlGaN层厚和Al组分有密切关系。揭示了AlGaN/GaN HFET的2DEG电荷涨落受控于表面、界面和缓冲层中的各种缺陷及外加应力，表面空穴陷阱形成的虚栅对输入信号有旁路和延迟作用，它们导致高频及微波状态下的电流崩塌。指出由于构成电流崩塌因素的复杂性，各种不同的抑制电流崩塌方法都存在不足，因此实现该器件大功率密度和高可靠性还有很长的路要走。
Electronic transport through a quantum dot in the Coulomb-blockade cotunelling regime is investigated both experimentally and theoretically, where a single-wall carbon-nanotube weakly coupled to metallic leads plays a role of the dot.We observe a pronounced current peak for the singlet-triplet transition in a half-she…
一个数学模型被提出预言形状进化和水花形成准备的一个管状的产品的最后的几何学。试管的形状进化上的几个重要处理参数的效果被调查。模型对水花的实验被验证形成的大直径试管。试验性并且当模特儿的结果证明在预先形成有三个不同区域，即，左转变区域，中间的一致直径区域和权利转移区域。结果表演是的粉碎成原子参数和 bs，底层的穿越的速度 v，底层的外部直径 D0，和起始的免职距离 d0 玩在轮廓和水花的墙厚度的重要角色形成了试管。但是底层的尖速度在存款的积聚上有小效果。在从这个过程的开始的某个时间以后，存款将进入一个稳定的生长状态。另外，一个方程被提供基于集体保存在稳定的生长状态下面估计存款的墙厚度。
Los Alamos National Laboratory (LANL) was established during World War II with a single mission -- to design and build an atomic bomb. In the 65 years since, nuclear weapons physics, design and engineering have been the Laboratory's primary and sustaining mission. Experimental and process operations -- and associated…
This work focuses on magnetohydrodynamic (MHD) mixed convection flow of electrically conducting fluids enclosed in simple 1D and 2D geometries in steady periodic regime. In particular, in Chapter one a short overview is given about the history of MHD, with reference to papers available in literature, and a listing of…
The planar extended shape of the phthalocyanine macrocycle results in a strong tendency of its derivatives to form densely packed co-facial aggregates. The strategy to avoid co-facial self-association that forms the basis of this thesis involves the use of substituents that can introduce severe steric crowding adjacen…
Glucose ist ein wichtiger Nährstoff für die Hefe Saccharomyces cerevisiae. Sie wird über die Glykolyse in Energie und zelluläre Bausteine umgesetzt. Gleichzeitig ist Glucose ein Signalmolekül. Steht den Zellen keine Glucose zur Verfügung, so wird diese über die Gluconeogenese synthetisiert. Glykolyse und Gluconeogenes…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation S. F. M. Yusop, H. A. Rafaie, S. Amizam, S. Abdullah, M. Rusop; Photoluminescence Study on the Pr…
A system approach to variable speed drives consisting of two low voltage induction motors (Y and A connection) fed by matrix and two-level DC-link converters is developed (chapter 7). The ratio of iron to copper winding losses is studied based on the induction motor equivalent circuit and constant V/f converter contro…
High pressure (HP) synchrotron x-ray diffraction studies were carried out in FeCl{sub 2} together with resistivity (R) studies, at various temperatures and pressures to 65 GPa using diamond anvil cells. This work follows a previous HP {sup 57}Fe Mossbauer study in which two pressure-induced (PI) electronic transitions…
Ni2MnGa is a ferromagnetic shape memory alloy (FSMA). FSMAs exhibit a shape memory effect which is induced through either the application of a magnetic field or mechanical stress. This shape change is reversible through the rotation of the magnetic field or stress. It has been shown that the mechanism for the shape me…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation S. Chaisitsak; Graphite‐encapsulated Iron Particles Grown by Mist‐CVD. AIP Conf. Proc. 1 June 200…
制备了Ho3+/Yb3+共掺的氧氟硅酸盐玻璃, 根据玻璃样品的差热分析(DTA)进行微晶化处理, 测试了Ho3+/Yb3+共掺微晶玻璃的X射线衍射(XRD)图谱、透射电镜(TEM)谱、吸收光谱和上转换发光光谱。根据Scherrer公式计算了CaF2微晶的平均晶粒尺寸,并与TEM谱进行比对; 利用晶体生长动力学理论研究了纳米CaF2晶粒的生长特性, 获得纳米CaF2晶体生长动力学方程; 研究了微晶玻璃中Ho3+离子的上转换发光特性; 分析了微晶玻璃上转换发光机制。研究结果表明氧氟硅酸盐微晶玻璃是一种良好的上转换基质材料。
Metal oxides have interesting physical and electronic properties that have resulted great contributions to the field of catalysis, sensing, portable energy storage and photoelectrochemistry. As many of these applications rely on the interfacial area of the active metal oxide, it is important to tailor the surface comp…
The construction of materials nanometer-by-nanometer in principle leads to the controlled design of a variety of materials with well-defined nanometer-sized architectures and novel yet predictable behaviors. Polyhedral silsesquioxanes of the formula (RSiO1.5)n, where n = 8, 10, or 12 and R is an organic functionality,…
计算了不同Al掺杂浓度下ZnO体系电子结构和光学属性。分析了掺杂对AZO(ZnO:Al)晶体结构、能带、态密度、光学性质的影响, 所有计算都是基于密度泛函理论框架下的第一原理平面波赝势方法。计算结果表明：Al掺杂ZnO在导带底引入了大量由掺杂原子贡献的导电载流子, 明显提高了体系的电导率, 费米能级进入导带。同时, 光学性质的计算表明光学带隙明显展宽, 且向低能方向漂移; AZO透明导电材料的光学透过率在可见光范围内高达85%, 紫外吸收限随着掺杂浓度的增加而发生蓝移。所有计算表明AZO材料可作为优良的透明导电薄膜材料。
Silver‐loading asymmetric polyethersulfone (PES) asymmetric membrane was prepared via the simple phase inversion technique. The homogeneous solution was prepared by dissolving AgNO3 and PES in N‐Methyl‐2‐pyrrolidone (NMP) or N,N‐dimethylformamide (DMF). The morphology of the resultant membrane was examined using a sca…
In this dissertation, density functional theory (DFT) calculations were used to investigate (1)NO2 adsorption on BaO in NOx Storage Reduction (NSR) catalyst affected by the morphology of BaO and the γ-Al2O3 support, (2) energy barrier of H2 dissociative adsorption over Mg clusters affected by its electronic structure,…
We report some of our recent progress in enhancing the extraordinary optical transmission (EOT), perfect absorption and field squeezing. Based on the excitation of surface plasmon waves in optical nano‐antennas, the extraordinary transmission of light through a vertical nano‐slit in a metal film is realized. Omni‐dire…