Materials Literature
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The use of advanced lightweight materials to improve combat survivability has been of crucial interest to the U.S. Army for a number of years. Specifically, hybrid organic/inorganic polymer matrix nanocomposites show promise in providing many of the physical properties required (i.e., lightweight structure, rugged abr…
The synthesis and surfactant activities of two new cationic gemini surfactants containingtriazole compound as spacer were described. Their critical micelle concentrations (CMC), whichare 1.8 × l0-4 mol/L and 3.9× 10-4 mol/L respectively, are much lower than that of conventionalsurfactant cetyltrimethyl ammonium chlori…
Vanadate glass formation in two heavy metal oxide systems is reported and in the process physical property data were obtained. These data were compared with earlier results found from alkali and alkaline earth vanadates. ( 1 ) 4 ) Glass formation limits extended over 0.00≤R≤1.50 for the alkali and alkaline earth vanad…
Influence of silicon content of hot working tool steel (4mass%Cr-Mo-V-Ni) on machinability at milling process has been investigated. The effect of silicon was compared with that of lubricant, concerning tool life, cutting forces and temperature, chip detachment from a tool, tool damages, surface oxidization, microstru…
In this paper the σ e relation of 45 steel under different initial temperatures (25～300 ℃) and strain rates(10-4～103 s-1) has been studied with the split Hopkinson press bar (SHPB) and the MTS (Materials test system), its constitutive relation is determined then.The metallography observation show that the re…
Cubic boron nitride (c-BN) was synthesized under high temperature and high pressure from the graphite-like hexagonal boron nitride (h-BN). The lattice parameters of c-BN have been measured in the temperature range from room temperature to 1000 ℃using high power high temperature XRD under room pressure. Therefore its i…
Sulfur hexafluoride exhibits many excellent properties that make it suitable for insulation of equipment used in the transmission and distribution power networks. Sulfur hexafluoride is an efficient infrared absorber, and owing to its chemical inertness it has a very long life(approx. 3200 years) in the Earth抯 atmosph…
A study has been made of proton migration in an anodic aluminum oxide film during cathodic polarization in 1 M hydrochloric acid solution at 30°C. The charge transported by proton migration in the oxide film during the polarization was quantitatively determined using time-of-flight-elastic recoil detection analysis. A…
Gold nanowell electrode arrays, with a well-depth of approximately 50 nm, have been prepared. The electrodes were prepared by the electrodeposition of gold throughout the pores of a porous alumina membrane. Both electrochemical gold stripping and ion bombardment were employed to remove gold to create the wells, with t…
Abstract The crystallization mechanism and the controlling factors in the crystallization of amino acid polymorphs were investigated. It was demonstrated that the effect of supersaturation (Ostwald's step rule) was not observed for systems of either L‐Glutamic acid (α, β) or L‐Histidine (A, B). The intensive effect of…
This papaer describes the magnetic properties of wound-core type three-phasetransformer. In the analysis, magnetization characteristics are approximated by a Fourier-series, and it is assumed that the eddy current factor is proportional to the time-varying magnetic flux. Moreover harmonic balance method where the zero…
Quaternary and ternary interdiffusion experiments of Al-rich α Al-Cu-Mg-Ag alloys have been performed in the temperature range from 793 to 853 K. The concentration profiles indicate that the diffusion distance of Cu is shorter than those of Mg and Ag in the solid solutions. The direct and indirect interdiffusion coeff…
The dielectric, pyroelectric and hysteresis loops measurements of NBT-KBT ceramics for stress-free or under compressive stress (0-1500 bar) have been carried out. It was shown that compressive stress shifts of phase transition, reduction of thermal hysteresis and decrease of the polarization. These effects can be main…
PbTiO3 is a prototypical ferroelectric material that exhibits a single structural phase transition (cubic to tetragonal): it is a soft mode driven, predominantly displacive, transition. In this paper, we study the behavior of PbTiO3 at finite temperature by ab‐initio molecular dynamics simulations. In this approach cl…
We determined the paraelectric and ferroelectric structures of RbHSO 4 by X-ray crystal structure analysis at nine temperatures. The ferroelectric structure is similar to one of two disordered arrangements of the paraelectric phase. Determined temperature dependence of the atomic mean-square thermal displacements is c…
By stabilising the otherwise unstable α-phase of the p-nitrophenyl nitronyl nitroxide radical as thin films we experimentally observe that this phase nearly behaves as a Curie paramagnet, as evidenced by a small Weiss temperature (θ = −0.3 K), in agreement with recent measurements performed on a rather unique single c…
Combustion processes evolving in mild conditions are correcterized by working temperature lower than the flame temperature of the traditional combustion systems, allowing for a drastic reduction of pollutant formation. Such operating conditions' need of specific plant configurations related to the recovery of flue gas…
In Escherichia coli, 4-(phosphohydroxy)-L-threonine and 1-deoxy-D-xylulose 5-phosphate are believed to be direct precursors of vitamin B6 (B6), and 1-deoxy-D-xylulose 5-phosphate synthase (Dxs) and transketolase could catalyze the formation of each precursor. In this report, the possible involvement Dxs and transketol…
Abstract Based on a solution of the polymer excluded volume problem, a technique is proposed to estimate some parameters at the isotropic-nematic liquid crystal phase transition (the product of the volume fraction of hard sticks and the ratio of the stick length, L, to its diameter, D; the maximum value of this ratio…
今回著者らは高分解能ガスクロマトグラフィー/質量分析法（GC/MS）を用いた臭素化ダイオキシン類の測定におけるスプリットレス注入法による注入時の熱分解反応について検討した．その結果，臭素化ダイオキシン類の測定において，GC注入口における十分な気化効率保持のための全温度範囲で，臭素化ダイオキシン類の脱臭素化体化合物が検出された．これらは得られたマススペクトルやGC保持時間及びクロマトピーク波形等の情報から考えて，注入時の瞬間気化時の熱分解反応生成物と考えられる．しかし，この熱分解反応は，同一設定及び条件下での異なるシステム間でその反応挙動が異なることも確認された．このことから，注入口内の微妙な環境の相違が，臭素化ダイオキシン類の熱分…