Materials Literature
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Magnesium (Mg) is easy to be corroded in contact with other metals due to the formation of galvanic cell at the interface because it has the lowest negative standard electrode potential (SEP) in industrial metals. The traditional methods to evaluate corrosion resistance such as saltwater immersion test, salt spray tes…
The Dy-free and Dy-substituted (0-100%) Nd-Fe-B sintered magnets based on the NEOMAX-50 type magnet were prepared, and the magnetic properties such as the saturation magnetizations, the coercivities and the magnetic anisotropy constants (K1, K2) were determined by the obtained data using an high field magnetometer. Th…
Magnesium alloys of AM30, AM60 and AM90 containing 3, 6 and 9 % Al, respectively, were prepared. The ingots of the alloys were warm-rolled and then solution heat treated. Microstructures of the alloys at as cast condition and after solution heat treatment were observed. Only α solid solution was observed in the soluti…
Decomposition characteristics of benzene, toluene and xylene in a DC corona discharge in an artificial air at atmospheric pressure are investigated. By-products from benzene, toluene and xylene are identified by infrared absorption spectroscopy, and the decomposition processes of those substances in the corona dischar…
Formation of fatigue dislocation structure in copper thin films under cyclic loading was studied by the discrete dislocation dynamics (DDD) simulations, in which the motion of dislocation was restricted by the interfaces. The present DDD simulations successfully reproduced planar-arrayed dislocation walls in a persist…
Relevant to materials synthesis by combustion, not only spontaneous ignition of compacted mixture but also flame propagation just after the ignition has been examined for Ti-Al system with rectangular shape. Not only experimental but also theoretical study has been conducted, after confirming that the size ratio, defi…
The nonlinear optical crystal grown from the melt GaSe∶ AgGaSe2(10%,mass percent) is identified as acentrosymmetric e-GaSe∶ Ag(≤0.04%,mass percent) and is used for phase matched frequency conversion.The silver presence results in 30% increase in microhardness,which allows the crystal to be cut and polished at arbitrar…
内部结构不对称复合微球是指无机粒子在复合微球内部呈现规律性、不对称分布的一类微球. 采用细乳液聚合的方法一步合成了平均粒径0.8 μm、磁含量为46.67%、比饱和磁化强度为23.20 emu/g 的内部结构不对称PSt/Fe3O4磁性复合微球. 详细考察了Fe3O4 纳米粒子表面修饰剂含量、乳化剂、助乳化剂、超分散剂、细乳化时间等因素对于复合微球形貌的影响, 探讨了内部结构不对称复合微球的形成机理. 同时通过TEM(透射电子显微镜), FTIR(红外光谱),VSM(振动样品磁强计), TG(热失重分析)以及激光粒度仪等表征手段对微球内部形貌、磁化强度及粒径等进行了表征,确定Fe3O4 纳米粒子表面性质是微球呈现内部结构不对称的决…
Simultaneous measurements of complex modulus and complex strain-optical (birefringence) coefficient were performed for silica particle suspensions in order to clarify the stress-optical relationship. The dynamic modulus was found to be described with three Maxwell models. The strain-optical coefficient changed its sig…
For the field of nickel electroforming, where thickness of about 100-500 μm is obtained at the current density of 20-50 A/dm2, increase in the current density is demanded for higher plating speed. Regarding the environmental impact, a plating bath without boric acid is also in demand.Results obtained from studying var…
The effect of Al2O3 on glass transition temperature Tg and thermal expansion coefficient α is studied for CaO-Al2O3-SiO2 glasses including 45, 50, 55, and 60 mol% SiO2 with a molar ratio of CaO/Al2O3 > 1. Tg increases and α decreases monotonically with increasing Al2O3 concentration. The result of infrared spectra sug…
Pure and Doped L-Arginine Maleate (LArM) a nonlinear optical material has been successfully grown from slow evaporation method. FTIR analysis was used to confirm the presence of various functional groups in the grown crystals. Kurtz powder SHG measurements confirm the NLO property of the grown crystal. X-Ray powder di…
We present a waveguide photodetector design for weak absorbers, such as ion-implanted silicon and polysilicon, utilizing a critically-coupled 1D photonic crystal cavity. Device lengths of < 15 µm can be achieved if scattering loss is managed.
To study the beta decay of nuclei far from the beta-stable valley, a new implantation and beta detection system has been developed at the Peking University. Working with the logarithmic MPR-16 preamplifier, this detection system covers a large energy range from keV to GeV with good energy resolution and stability. By…
Alumina composites reinforced with multi-walled carbon nanotube (MWCNT) content up to 3.7 vol.% were prepared by precursor method. The MWCNT used in this study were modified with the acid treatment for 0-4 hours. The rationale behind the acid treatment was to introduce nanoscale defects and adsorb negatively charged f…
The anode properties of SiO-C electrode materials [SiO-C:α-Fe2O3 = x:100 − x (wt%)] containing α-Fe2O3 fine powder (spherical particles, ca. 0.16 µm) as the additive were investigated in a lithium cell using lithium metal as the counter electrode. It was observed by scanning electron microscopy (SEM) that spherical α-…
Overhead lines (OHL) operating at 400kV, form the backbone of CLP Power's transmission network. Unlike underground cables, overhead lines are vulnerable to external environmental attacks, such as adverse weather, high humidity, pollution, ground stability, vegetation, and flying objects etc. To ensure high reliability…
本研究では，硝酸酸化とその後の脱気処理により，細孔構造が同等で異なる表面酸性官能基量をもつ活性炭を調製し，それらを吸着剤として用いて11種類の芳香族化合物の吸着実験を行った．吸着実験を通じ，活性炭表面の酸性官能基の有無と，吸着質として用いた芳香族化合物の芳香環に結合した置換基のもつ性質が，吸着に及ぼす影響を調べるとともに，吸着形態を考察した．表面酸性官能基をもつ活性炭（DAOx）は，官能基をもたない活性炭（DAOxOG）よりも，芳香族化合物に対する吸着親和力が小さいことがわかった．しかし，ニトロベンゼンのような双極子モーメントの大きい芳香族化合物は，フェノールのような双極子モーメントの小さい芳香族化合物とは対照的に，溶質が高濃度に…
We report changes in the degrees of tri-axial orientation as functions of applied magnetic field and rotation rate for Y2Ba4Cu7Oy powder samples oriented in epoxy resin under modulated rotating magnetic fields (MRFs). Although the degrees of orientation were reduced for the decrease in both applied field and rotation…
以巯基小分子为配体水相合成CdTe量子点, 通过调节回流时间调控其粒径大小. 由于量子点的宽谱激发特性, 在蓝光(473 nm)或绿光(532 nm)条件下, 纳米金属薄膜表面不同发射波长的CdTe量子点均可被激发而与金属表面等离子体发生耦合相互作用, 从而在棱镜一侧发出高度定向的偏振荧光, 其荧光特性与样品厚度密切相关. 表面等离子体耦合荧光发射法(SPCE)具有波长分辨性质, 不同颜色的量子点在不同角度定向发射, 发射波长越长, 角度越小. 720 nm和630 nm量子点的自由空间发射荧光光谱呈现交叠, 然而, 基于SPCE的波长分辨性质, 我们通过改变检测角度避开光谱重叠, 在棱镜一侧的43o和51o处分别得到了两种量子点…