Materials Literature
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Fluid filled cables continue to display reliable operation at high design stresses: conductor screen stresses for paper and PPL designs are 15 kV/mm and 18 kV/mm respectively. Polymeric cables, and accessories, have not been in service long enough to establish, empirically, a limiting value for the design stress as us…
Spinodal silicas, with similar properties to phase-separated glasses but showing high mechanical strength, with large pore sizes and porosities (total pore volume to total particle volume) of 0.7 or more have been produced by adding monobasic sodium phosphate and ammonium molybdate to a silica sol, drying to obtain pa…
The mechanical properties of the Ti-6Al-7Nb alloy, used to manufacture high-strength prostheses, are highly dependent on its microstructure. This work presents the microstructural changes of this alloy under isothermal hot working. It is shown that the microstructure is strongly affected by the strain rate, temperatur…
Severe pitting corrosion occurred in a horizontal steel pipeline used to transport multiphase fluid, including water, oil, and natural gas, after 2 months of service. The pitting corrosion rate was up to 42 mm/year. Chemical analysis, X-ray diffractometry, and EDAX showed that the corrosion products mainly consisted o…
PVDF/PMMAブレンドの混合比,溶融状態からの冷却速度を変化させ,X線回折により,ブレンド物の相溶性およびそのときのPVDFの結晶構造を検討した。混合比により,PVDFとPMMAが相溶した非晶状態と,ブレンド物が相分離した結果生成するPVDF(II型)の結晶構造との二形態を形成した。これら試料を熱処理(120°C)すると,PVDF/PMMA(70/30-80/20)の混合比で,PVDF(I型)の結晶構造が形成した。熱処理によりPVDF(I型)とPVDF(II型)の異なる結晶構造を形成するのは,PVDF/PMMAの相溶性が混合比で異なるため,相溶性が高い場合PVDFの結晶化速度が遅く,その結果PVDF(I型)を形成するためである…
The effect of selective removal of organic matter and amorphous and crystalline iron oxides on N2-BET specific surface areas of some soil clays was evaluated. Clay fractions from 10 kaolinitic tropical soils were successively treated to remove organic matter by oxidation with Na hypochlorite, amorphous Fe oxide with a…
In order to clarify the size effect of an interlacer and easily choose conditions to process interlaced yarns with a desired number of tangles, we made 16 interlacers with various sizes of both yarn duct diameter d and air jet nozzle diameter dn and measured the number of tangles of interlaced raw yarn. Then the numbe…
(opens in new window) Buy Article (opens in new window) Permissions and Reprints (opens in new window) All articles of this category (opens in new window) This Account describes the synthetic and spectroscopic work of the author and his collaborators in the chemistry of diporphyrins linked in the meso -positions by (i…
Hydrogen distribution in pure vanadium, V-5 mol%Fe, V-50 mol%Ti and V-47.5 mol%Ti-5 mol%Fe alloys has been observed quantitatively by the tritium radioluminography to investigate the hydrogen behavior in them. Hydrogen concentration has been found to be non-uniform in the surface of each specimen depending on their mi…
The behavior of a bubble in collision with a poor wettability plate was experimentally investigated. Equilibrium shape of a sessile bubble beneath a horizontal plate was determined from the condition minimizing the bubble energy being the sum of the potential energy and the surface energy. Rebound motion of an impacti…
Description The ninth volume in this ongoing series features the latest data on oxygen compatibility, safe systems designs, and metallic and nonmetallic ignition and combustion processes. 32 peer-reviewed papers are divided into the following key areas: Overview--reviews and compares current test methods used in the s…
The effect of calcium cyanamide (CaCN2) addition on the sintering of AlN ceramics was investigated. Pressureless sintering was carried out with 0 to 3.0mass% CaCN2 addition, and densified sintered specimens (relative density>97.0%) were obtained using 1.0 to 2.0mass% CaCN2 addition depending on sintering temperature a…
Al2O3-coated graphite powder was prepared using ethyl acetoacetate aluminium diisopropoxide through the sol-gel method. The fluidity of the Al2O3-coated graphite powder slurry was studied. The apparent viscosity of a 2mass% Al2O3-coated graphite powder slurry was lower than that of a graphite powder slurry in the rang…
The safety and health problems of an experimental magnetic fusion facility for a static magnetic field and variable electric and magnetic fields were considered. Static magnetic field strength was measured with a gauss meter in a large helical device (LHD) hall and outside of the 2-m concrete wall used as the radiatio…
The chemical state of the tungsten (W) in the rust of low alloy steel was analyzed by EPMA and XPS, and the electrochemical behavior of rust was investigated by alternating current (AC) impedance method after wet/dry cyclic corrosion test with chlorides. The 1.0mass%W-bearing steel showed higher corrosion resistance t…
A parameter identification of the Jiles-Atherton hysteresis model for a soft magnetic composite (SMC) is realized directly by a nonlinear optimization technique coupled with a 2D field calculation. The identification method fits experimental instantaneous voltage and current measurements realized on a transformer with…
Das Schwingfestigkeitsverhalten von induktiv randschichtgehärteten Bauteilen und bauteilähnlichen Proben erklärt sich schlüssig aus der Gegenüberstellung von Lastspannungs- und Schwingfestigkeitsprofil (Woodvine-Analyse). Maßgebendes Kriterium ist die kritische Verfestigungstiefe. Festigkeitsbetrachtungen im Bereich d…
A new series of rigid polyesters and semiflexible polyethers were synthesized from 4,4″-dihydroxy-5′-phenyl or anthracenyl-m-terphenyl. The polymers were characterized by viscometry, Fourier transform infrared, NMR, X-ray, differential scanning calorimetry, thermomechanical analysis, thermogravimetric analysis, ultrav…
Blends of 60/40 phr of MDPE/EPDM have been subjected to radiation vulcanization by gamma rays of 60 Co in the presence of either HAF carbon black or white Hisil. The effect of the level of loading with Hisil has been followed up in the range of 0-100 phr. Mechanical properties, namely, elongation at break, tensile mod…
The effects of ionizing radiation on ethylene-propylene copolymer were evaluated over the range of total γ doses up to 500 kGy. The influence of the irradiation dose was investigated by oxygen uptake and thermal analysis. Four testing temperatures (170, 180, 190, and 200°C) and two heating rates between 2.9 and 5.9 K/…