Materials Literature
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Thig study was conducted to get a knowledge on chemical components of the cooked tuna bones (skipjack tuna bone and yellowfin tuna bone) as a food resource. The crude protein of tuna bone was around on the dry basis. The imino acid content (193 imino acid residues /1,000 amino acid residues) of collagen extracted from…
Two new species of Tortanus (Atortus), T. (A.) ampliramus and T. (A.) nishidai, are described from the northern Red Sea and the Gulf of Aden, respectively. These new species evidently belong to the recticauda species group in the recticauda species complex. The species group has a distinct distribution in the western…
A Gram-negative bacterium, strain AL98, was isolated from foul water inside of a deteriorated car tire on a farmer's field in Münster, Germany. The strain was able to considerably disintegrate natural rubber (NR), either in the raw state as NR latex concentrate or in the vulcanized state as NR latex glove, as well as…
Investigators at Marshall Space Flight Center (MSFC) are studying the potential benefits of cryogenic treatment for aerospace Aluminum (Al) alloys. This paper reports the effects of cryogenic treatment on residual stress, tensile strength, hardness, fatigue life, and stress corrosion cracking (SCC) resistance.
A method for equal-channel angular pressing (ECAP) that uses a rotary die was applied to SiC whisker reinforced 7075 alloy composites to produce a fine-grained microstructure suitable to attain superplasticity in the composites. Despite the low ductility of the composites, the rotary die permitted up to 10 passes of E…
Grain selection during solidification is of importance to the processing of solidified structure. It plays an important role in unidirectionally solidified products such as turbine blade. In order to understand the effect of the interfacial morphology on grain selection in unidirectional solidification, an experimenta…
シリカ充てんゴム複合材料中に存在するバウンドラバーの生成機構を検討した. シリカ1次粒子の粒径, 比表面積および単位面積当たりのシラノール基数 (N) が異なる数種のシリカとポリイソプレンを試料として, シリカ単体およびゴム中でシリカが形成する凝集構造を透過型電子顕微鏡により観察した. また, バウンドラバーのNMR測定より運動性に関する情報を得た. その結果, シリカ単体が形成する凝集塊は, シリカ表面に存在するシリカとの相互作用が弱い吸着水 (自由水) の脱離に伴い, 凝集塊のサイズが大きくなること, またその平均サイズはNの減少とともに小さくなり, Nが極端に小さい場合は凝集構造が形成されないことがわかった. これらの結果は…
The three-point bending strength of two-dimensional SiC fiber-reinforced SiC composites (SiC/SiCf) fabricated by chemical vapor infiltration (CVI) method and polymer infiltration and pyrolysis (PIP) method was measured at room and high temperatures up to 1600°C and the fracture behavior was investigated. The maximum s…
By chemical vapor deposition, we have tried to grow epitaxial films of graphene nano-ribbons on Pt (755) and TiC (755) surfaces. Some properties of these graphene films have been clarified by X-ray photoelectron spectroscopy, low energy electron diffraction, and angle-resolved ultraviolet photoelectron spectroscopy. N…
The effect of wheel speed and annealing including rapid thermal annealing were examined on the magnetic and structural properties of Nd/sub 15/Fe/sub 78.5/C/sub 5.5/B ribbons. Optimal coercivities in the range of 10-14 kOe have been obtained for different wheel speeds. However, the magnetic hysteresis loops of the con…
If a super-large core with a groove is molded with an axial molding press replacing the conventional die set, uneven density distribution occurs in the core because the molding pressure considerably converges on the groove of the core. Since this induces the residual stress in the groove to be released during the sint…
A physically valid theory of partial discharge (PD) transients is based upon the concept of the charge induced upon the detecting electrode by the PD. This induced charge consists of two components. One is associated with the actual space charge in the void, while the other is related to changes in the polarization of…
The effect of benzaldehyde, 2-hydroxybenzoyl hydrazone derivatives on the corrosion of aluminium in hydrochloric acid has been investigated using thermometric and polarization techniques. The inhibitive efficiency ranking of these compounds from both techniques was found to be: 2>3>1>4. The inhibitors acted as mixed-t…
The possibility of using the iodide method and the method of bleaching of 4-nitroso-N, N'-dimethylaniline, developed originally for homogeneous aqueous medium for the determination of singlet oxygen production, was tested for water-insoluble nonpolar senzitizers adsorbed on the silica gel support. Sensitizers of the p…
This paper briefly describes the signal processing to determine the space charge and electric stress distributions using the newly developed pulsed electro-acoustic (PEA) system for use on power cables. Due to the coaxial geometry and the thick walled insulation, factors such as divergence, attenuation and dispersion…
In order to decrease frost on an air conditioner's fins, super water-repellent aluminum is required. Two requirements for the super water-repellent surface are reported, i.e., (1) roughness surface (large surface area) and (2) water-repellent functional group on the surface. Using both electrolytic etching and anodic…
The dynamic rheological behavior of a liquid crystalline polymer (LCP), Vectra™ A, and nylons was investigated. The viscosities of nylon 66 and nylon 6 decrease slowly with an increase in temperature, while the viscosity of Vectra A drops dramatically at 280 °C, but remains slightly changed above 300 °C. At constant f…
This paper deals with the study of PD ageing in a flat cavity at different thermal conditions. Actually, we deem that mastering the aging of insulating materials under their real working conditions is of great importance for a good dimensioning of the insulating parts of power electrical equipment, such as components…
The formation of germanate phases with the mullite structure [Ga6Ge2O13, Al6Ge2O13 and (Ga,Al)6Ge2O13] from oxide mixtures and hybrid sol–gel precursors was studied by thermal analysis, XRD, IR spectroscopy and multinuclear MAS NMR. The course of the thermal reactions in all the Ga-containing oxide mixtures, irrespect…
The effect of conformation (E/Z isomerism), nature (donor/acceptor) of substituents, and endgroups (indandione, pyrazolone, pyrazoledione) on the molecular hyperpolarizability βvec of dicyanomethylene (hetero)aromatic dyes is investigated by means of semiempirical (AM1, ZINDO) molecular orbital calculations. Unless Z…