Materials Literature
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In this chapter, we introduce the optical properties of dealloyed nanoporous metals and their applications in surface-enhanced spectroscopy for detection and identification of organic and biological molecules. Similar to those of other nanostructured metals, the excellent optical properties of nanoporous metals origin…
The magnetism of DySc2N@C80 endoful- lerene was studied with X-ray magnetic circular dichroism (XMCD) and a magnetometer with a superconducting quantum interference device (SQUID) down to temper- atures of 2 K and in fields up to 7 T. XMCD shows hysteresis of the 4f spin and orbital moment in Dy III ions. SQUID magnet…
The lightning impulse voltage-time characteristics of insulator string are crucial for lightning protection design of transmission lines and PGLPD design.The lightning impulse voltage-time characteristics of 14 and 28 units XP-70 suspension insulators as well as composite insulators whose dry arcing distances were the…
This study was conducted to investigate the body mapping of sweat rate and the effects of the airflow to sweat rate during cycling. Ten male volunteers were recruited. All tests were conducted in a climatic chamber (12 ± 0.5, 50 ± 5%RH) under two different conditions: high airflow (HAF, 2 m/s) and low airflow (LAF, <…
Based on the structures of GaAs/InAs-GaAs/ZnSe P-i-N quantum dot solar cells, according to the optical principle and diffusion theory, mathematic model describing the relationship between photogenerated electron current density and thickness of layer is proposed, and the effect of the quantum dot layer on the characte…
The defects in HMX, induced by thermal expansion, phase transition and chemical decomposition, have large effects on the performance of HMX. In this work, the defects of HMX samples under heat treatment are characterized by small angle X-ray scattering (SAXS) and atomic force microscopy. A large number of pores with a…
It is recognized that the fatigue properties of weld joint is successfully enhanced by mitigating the stress concentration at weld toe with smotherning the profile, as well as managing the residual stress at the weld toe. To attain the desireble weld toe profile without deteriorating the productivity of manufacturing…
Lead-free ceramics Li 0.015 Na 0.985 NbO 3 are synthesised using a conventional solid-state process. A single-phase perovskite ceramic structure is identified with an X-ray powder diffraction technique. An energy-dispersive X-ray spectroscopy analysis performed for individual grains of our sample shows a fairly homoge…
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超臨界CO2中における多孔性シリカの疎水化表面修飾について，アルコールを修飾剤とした反応を検討した．実験は，修飾試薬としてメタノール，エタノール，2-プロパノールを用い，温度40–100°C，圧力8–20 MPa，反応時間0.5–6 h の条件下で行った．その結果，すべての条件下で表面修飾は進行していること，さらに修飾で生成するアルキル基密度は，メタノール>エタノール>2-プロパノールの順となることが判明した．メタノールを修飾試薬とした場合の圧力依存性・アルコール濃度依存性からは，アルキル基密度が混合系の相境界近傍の圧力，濃度条件下にて極大を示すことがわかった．また，修飾後の表面疎水化の程度は，アルキル基密度とアルキル基の大きさに…
A alternative magnetic field generator is prepared by special circuits and active coils and the effects of different magnetic field intensities on the macro morphologies and microstructures of Fe-based composite coatings are studied by laser cladding process.Based on the electromagnetic principle and liquid metal soli…
通过溶液共混技术成功制备了一系列聚乙二醇功能化石墨烯(GO-PEG)填充的聚乙二醇4000(PEG4000)基纳米复合材料.利用红外(FT-IR)、X 衍射(XRD)、扫描电镜(SEM)、热重(TG)及玻璃化转变温度(Tg)等表征手段详细研究了复合材料的结构和热性能.结果表明：GO-PEG 可均匀分散在聚合物基体中，纳米复合材料呈层状结构；组分间的较强界面相互作用协同增强了纳米复合材料的热稳定性能.最终，提出了层状纳米复合材料的形成过程及机理.
Figure 1: Various super-cooled droplet sized encounters in presence of a rising air system and high humidity resulting in aircraft icing [3]. Figure 2: A possible impact scenario, with liquid impacts ensuing in either splashing, ice adhesion or erosion [5]. Ever since the early days of aviation, scientists have undert…
In the cleaning processes of manufacturing semiconductor devices, two-fluid spray cleaning technique is widely used: however, the detailed cleaning mechanism has not been clarified yet. In this study, we focus our attention to the elementary process of this cleaning technique, i.e. a single droplet impact on a solid s…
This review is focused on current state of materials design and syntheses of organic semiconductors for thin-film field effect transistors (FETs). Recently, high performance p- or n-type organic FETs with high charge carrier mobility, high ON-OFF current ratios and high stability have been achieved due to the improvem…
Materials selection in product development is an important task. The wrong choice of material can increase the cost of the product and/or lead to failure in the field. Therefore, during the development of a product, a suitable material must be selected based on product requirements and materials properties. This paper…
An accident scenario of Fukushima Daiichi Nuclear Power Plant, Unit 2 is analyzed from the data open to the public. Phase equilibrium process model was introduced that the vapor and water are at saturation point in the vessels. Proposed accident scenario agrees very well with the data of the plant parameters obtained…
Nano-sized yttria (Y2O3) powders were successfully synthesized at a low temperature of 400 degrees C by a simple polymer solution route. PVA polymer, as an organic carrier, contributed to an atom-scale homogeneous precursor gel and it resulted in fully crystallized, nano-sized yttria powder with high specific surface…
In smectic-A liquid crystals, a unity director vector $\boldsymbol{n}$ appear modeling an average preferential direction of the molecules and also the normal vector of the layer configuration. In the E's model [5], the Ginzburg-Landau penalization related to the constraint $|\boldsymbol{n}|=1$ is considered and, assum…
We derive some fluid-dynamic models for electron transport near aDirac point in graphene. We start from a kinetic model constitutedby a set of spinorial Wigner equations, we make suitable scalings(hydrodynamic or diffusive) of the model and we build momentequations, which we close through a minimum entropy principle.…