Materials Literature
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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…
Diatom and calcareous nannofossil biostratigraphy was established for the PlioceneKuwae Formation along the Natsui stratigraphic section, Tainai River, Kitakanbara area in NiigataPrefecture, central Japan. Three useful diatom biohorizons, the FO (first occurrence) ofNeodenticula koizumii; RI (rapid increase) of N. koi…
Emissions of methane to the atmosphere are deemed by many to pose environmental problems. Conversion of methane to carbon dioxide through combustion reduces greenhouse gasses and can provide a source of energy. Catalytic combustion is a viable option for oxidation of lean methane streams. Lean methane mixtures can be…
The effect of ageing in parent phase and martensite stabilization on melt spun Ni50Ti30Hf20 ribbons were investigated by Differential Scanning Calorimetry and X Ray Diffraction. Thermal treatments in parent phase generally shift the martensitic transformation range as far as an equilibrium state is reached. The equili…
Thermal aging embrittlement of newly developed W-alloyed 9%Cr ferritic steel KA-STBA29/KA-STPA29 (ASME T92/P92) was investigated. In order to clarify the controlling factor of embrittlement, Charpy impact tests were carried out, and characterization of precipitates was determined through use of materials that had been…
Optically transparent and homogeneous polymer hybrids of poly(2-methyl-2-oxazoline) (POZO) and vanadium oxide (V2O5) can be prepared by utilizing the hydrogen bonding interactions between the amide groups of POZO and V–OH groups formed in the hydrolysis of vanadium(V) oxytripropoxide (TPVO). POZO acts as a stabilizer…
The end use requirements for standard ASTM F 562 wire for pacing leads present difficult challenges to achieve the desired performance of these permanent implant devices. It will be shown that an optimized process produces a measurable improvement in surface finish and greatly improved fatigue life of wire forms under…
In this study, new organic-inorganic hybrid composites were prepared by means of an in situ sol-gel process. The polymer used as the continuous phase was the metallocene polyethylene-octene elastomer (POE) or the acrylic acid grafted polyethylene- octene elastomer (POE-g-AA). The silica forming the inorganic phase was…