Materials Literature
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This paper describes some of the yarn deformations and relative movements between yarns which occur when an isolated yarn is pulled through 20 crossover yarns out of an untreated cotton weave which has a relatively open and regular structure. The described deformations are of two kinds: linear extension in the selecte…
Spectroscopic and electrochemical studies, incorporating electronic spectra, electron paramagnetic resonance (EPR) spectra, resonance Raman (RR) spectra, and measurements of the redox potential, have been carried out on the blue copper protein azurin, from Alcaligenes denitrificans. These data are correlated with the…
A tight-binding version of the itinerant spin-fluctuation theory is used to describe the electronic structure of MnTe in both magnetically ordered and disordered phases. The static model of disordered local moments is shown to be sufficiently accurate to form the basis for a quantitative description of semiconducting…
Photoluminescence from the neutral vacancy in diamond is shown to have a radiative decay time tau =2.55+or-0.1 ns in the limit of low temperature, for photon excitation at energies 1.8<hv<3 eV. With increasing T, tau decreases. The quantum efficiency is estimated to be only about 1.5% even at low T. Detailed-balance a…
The MerR protein mediates the induction of the mercury resistance phenotype in bacteria; it has been isolated in order to study the effects of metal-ion induced changes in the metabolism of prokaryotic cells at the molecular level. After DNA sequences responsible for negative autoregulation were removed, the 16-kiloda…
Abstract In electron scattering measurements of the Compton profiles of solids, multiple scattering events contribute strongly to the observed profile. The dominant contribution to the multiple scattering arises from events in which Bragg scattering is followed by Compton scattering. The Bragg scattering is calculated…
Quantum mechanical calculations of the surface stress tensor at the aluminum (111) and (110) surfaces are presented. In each case the stress is tensile, favoring contraction in the plane of the surface. This tensile stress is caused by smoothing of the electronic wave functions at the crystal surface.
It is shown by model calculations that the dispersion of the diagonal part of the dielectric constant near the plasma edge in a metallic crystal has a strong influence on the magneto-optical properties. The plasma edge leads to resonancelike peaks in the Kerr rotation and Kerr ellipticity spectra and to a strong enhan…
摘要 结合快离子导体玻璃的结构特点和倪嘉陵(Ngai) 的低能激发、弛豫、耗散统一理论, 依据非Markov 方程探讨了快离子的输运特点, 导出了非晶态快离子导体电导的频率一温度依赖关系. 理论方法与现有快离子导体电导理论不同, 结果表明与实验数据符合较好, 理论能较好地描述低温下电导的色散现象. 色散的程度与表征物质内部结构差异的参数— 红外发散指数n有关. Abstract Based on the characteristics of superionic glasses and a physical picture of unified theory of the low-frequency fluctuation, di…
3BaO·3B2O3·2GeO2 is a new compound in the ternary system BaO-B2O3-GeO2. Its crystallization process has been studied by means of thermoanalysis method. The temperature of crystallization decreases distinctly with decrease of the grain size. The activation energy of crystallization of the amorphous material with differ…
少量溶液の取り扱いに有利な重量基準による標準添加法を原子スペクトル分析法と組み合わせて検討した.従来の容量基準による方法と異なり,試料溶液の分取量,標準溶液の添加量,最終溶液量をそれぞれ正確に一定にする必要はなく,試料溶液の希釈率を補正係数として用いることにより従来法となんら変わりなく標準添加法を適用することができ,正確さ及び再現性とも良好であった.本法をアルミニウム合金(NBS 87a,NKK 916)及び99.99%アルミニウム中のマグネシウムのAAS定量及び標準岩石(GSI-JG-1)中のリチウムのICP-AES定量に応用し,良好な結果を得た.
Diamond was synthesized by using the Fe-Ni-Cu alloy. As compared with the diamond-formation region obtained with the Fe-Ni alloy, the region shifted to the lower temperature and pressure side. This shift has been explained in terms of the change of melting temperature due to an addition to Fe-Ni alloy, because Cu itse…
The corrosion of copper in sulfuric acid/hydrogen peroxide etching solutions with n-alkylamines was studied by means of weight loss and polarization techniques at various flow rates of the etching solution.The addition of n-butylamine to the basic etching solution (2mol H2SO4+2mol H2O2+1kg H2O) led to both the polariz…
Magnetic field effects on R-and R'-spectra in YbCrO3 are investigated by using a magnet system in High Magnetic Field Laboratory, Osaka University. The spin system orders antiferromagnetically below TN118 K with the r"Γ2-type configuration. The experimental data of the shift in R-line show complicated behavior in the…
ジフェニルメタンジイソシアナートを含む化合物とビスフェノールAのジグリシジルエーテルとをN-メチルモルホリンの存在下, 加熱して得られる樹脂硬化物の曲げ特性を25℃で測定した, 曲げ強さはイソシアナート化合物とエポキシ化合物のモル比 (0.63～51) 及び加熱処理温度 (180, 200, 及び225℃) などに強く依存することを見いだした. 硬化物の赤外線吸収スペクトルを測定し, イソシアヌラート環とオキサゾリドン環の形成割合を解析し, 曲げ強さとの関係について考察を加えた. 硬化物中の未反応のイソシアナート基量をスベクトルの吸光度比から定量化し, 硬化反応がほぼ終了するまで, 更に加熱し, 曲げ強さを追跡して樹脂組成物の硬化…
Hot corrosion behaviour of a nickel base alloy by vanadium has been investigated at 600 and 700°C. Crack growth studies, metallographic and SEM, X-ray examinations have been carried out to understand the nature of hot corrosion and crack propagation. Spot tests, ternary diagram determination and weight change experime…
The evolution of the dislocation microstructure during irradiation of a deformed Fe-2 1/4 Cr-1 Mo ferritic alloy was characterized by two competing processes. At low temperature, the dislocation density increased due to loop formation and interaction. At higher temperature, the dislocation density decreased due to rec…
Tetrahalogenochromates(II) containing mixed halides, [NRH3]2[CrClxBr4–x](R = Me, Et, Prn, Bun, or n-C8H17), exhibit similar ferromagnetic behaviour to the homoleptic tetrahalogenochromates(II). Broad spin-allowed d–d absorption bands at ca.10 900 cm–1 in their reflectance spectra indicate tetragonal six-co-ordination…
Abstract Aerial cable lines running in forests are often damaged by animals. This paper introduces an animal‐resistant cable design by analyses of the fracture of metals when a shearing force is applied. As a result of the analyses, it is understood that when shearing forces are applied repeatedly to a metal plate wit…
18-8ステンレス鋼を大気中,400～700℃ で酸化すると,光干渉性の酸化皮膜が形成する。オージェ電子分光法とX線光電子分光法の測定結果により,この酸化皮膜の主成分はCr,Fe,Oであり,Ni含有率は少ないことがわかった。酸化温度の上昇に応じて,酸化皮膜中のFe含有率が減少し,Cr含有率が増加する傾向がある。酸化皮膜の外層はFe203あるいはFe304+Cr203,内層はFeO+Cr203からできている。高温酸化処理はステンレス鋼の耐孔食性に大きく影響を与え,400℃ で酸化した試料では通常め孔食点がでており,600℃ で酸化した試料では,表面皮膜がはく離されて,素地を侵食する二段階であるζ とがわかった。酸化濃度が高いあるいは…