Materials Literature
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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…
Using bis(2-ethylhexyl) sodium sulfosuccinate (AOT) as surfactant, a series of amphiphilic porphyrins terminated with imidazole were studied in AOT/isooctane/water reverse micelles, intending to mimic the relationship between microenvironments in organisms and the amphiphilic properties of porphyrins for photodynamic…
The main objective of the paper is the investigation of the interaction and reflection of elastic-viscoplastic waves which can lead to localization phenomena in solids. The rate type constitutive structure for an elastic-viscoplastic material with thermomechanical coupling is used. An adiabatic inelastic flow process…
The Industry-Sponsored Metals Combustion Test Program 96-1 was coordinated through Wendell Hull & Associates, Inc., on behalf of several contributing companies, and all design and testing was performed at the NASA White Sands Test Facility. Phase I of this test program studied the threshold pressure for self-susta…
SUMMARYHexavalent chrome passivates have been used for improving the corrosion resistance of sacrificial zinc and zinc alloy coatings on ferrous substrates for many years now. However, forthcoming legislation and corporate policies are beginning to curtail the use of hexavalent chrome compounds and replacements are ac…
The high-speed photography has been applied to observe the expanding fracture of the steel cylinder shells, drive which by detonation. The clear photos of expanding process of steel cylinder shells have been obtained. The fracture strain of the expanding steel shell becomes larger when the strain rate increase to arou…
The ZrO 2 (2Y)/TRIP steel composites were prepared by vacuum hot pressing sintering. The room temperature static tensile and dynamic yield strength were tested using the static tensile and Split Hopkinson Pressure Bar methods, respectively. The effects of load mode on the static and dynamic mechanical behaviors were s…
The research on titanium alloy materials is paid great attention. This paper review the current situation of titanium alloys developed by the materials research units in recent years, including high temperature titanium alloys, titanium matrix composites, high strength and high toughness titanium alloys, fire resistan…
Based on material property, macro and micro factors affecting ablative performance of C/C composites for SRM nozzle throat are discussed. Their inter-influences are also analyzed.
The International Union of Laboratories and Experts in Construction Materials, Systems and Structures (RILEM) was founded with the aim to promote scientific cooperation in the area of construction materials and structures worldwide. This mission is achieved through collaboration of leading experts in construction prac…