Materials Literature
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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…
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2009.
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 M. Pica Ciamarra, M. Nicodemi, A. Coniglio; Flow and jamming of sheared granular media. AIP Conf.…
用邻苯二腈和FeCl3、ZnCl2·6H2O为原料，以离子液体[bmim]BF_4为溶剂合成铁酞菁PcFe和锌酞菁PcZn；用红外及紫外光谱对其进行表征；相比液相法合成酞菁，可避免溶剂有毒、易挥发等缺点，离子液体可重复利用且活性不降低。
有从 30 ～ 150 nm 的厚度的圆柱的分薄电影被直接当前的磁控管在 corning 玻璃底层上用 Ar/N2 煤气的混合物(V (N2 )/V (N2+Ar )=5%) 劈啪作响扔。结构，表面形态学和磁性用 X 光检查 diffractometry (XRD ) 被调查，扫描电子显微镜学，原子力量显微镜学，传播电子显微镜学(TEM ) 和超导的量干扰 magnetometry。XRD 调查证明分电影展出象非结晶一样结构；然而， TEM 大小在这些电影显示 -Fe+-Fe2N+-Fe3N 的混合阶段的合成。分薄电影的磁性的 anisotropy 和 coercivity 在电影生长行为和表面形态学上展出强壮的依赖。与与列结构增…
"La mina La Caridad se ubica en Sonora y se trata de la mina más grande de México. El yacimiento es un sistema de pórfido cuprífero con una edad alrededor de 54 Ma. Sobre las coordenadas Mercator: 638232 N y 3354816 E, y entre los niveles 1305 y 1410 se han descubierto bellos ejemplares de vivianita (Fe3(PO4)·8H2O) de…
Polyurethane (PU) solved in dimethylformamide (DMF) was electrospun under one set of conditions on two different support textiles. The mechanical properties were measured and aerosol filtration tests were done. The hole size distribution was calculated with a new digital image analysis methodology on SEM images. It ha…
Les travaux effectues dans le cadre de la normalisation europeenne dans les annees quatre-vingt-dix, ont permis de franchir un pas considerable dans le domaine du calcul des coffrages metalliques pour les planchers collaborants. L'etape importante a ete l'introduction d'un modele elasto-plastique de comportement des c…
Nuclear Magnetic Resonance (NMR) spectroscopy has become an important tool to investigate the structure and dynamics of proteins and protein complexes. The recent progress in solution and solid-state NMR opens the door to detailed analyses of large macromolecular structures, and notably, symmetric protein aggregates.…
回来后开始怀疑维修思路，静下心来分析背投彩电图纸，主、子画面所用相同的两块M52470是否没换对。第四次派修理人员上门认真核对实物，两块集成块，一块位于主板高频头一侧；另一块位于AV立板。更换AV板上M52472TV／AV切换电路后，开机图像、伴音正常。
A large number of materials and substances show decomposition reactions during handling, production and transport. The amount of heat and pressure generated during this decomposition will determine if a substance can be considered thermally stable in a specific packaging size and temperature. Often the so called Self…