Materials Literature
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Guided by the internal-reference rule and the known band offsets in III-V and II-VI diluted magnetic semiconductors, we discuss the feasibility of obtaining p-type conductivity, required for the carrier-induced ferromagnetism, as well as the cases for which the doping by shallow impurities may lead to the ferromagneti…
Ag2O-B2O3-Al2O3 glasses were prepared by melting and quenching method and the state of silver in the glasses was examined by optical absorption spectra. These glasses have two absorption peaks at less than 300nm and 320nm, which correspond to Ag+ ion and atomic Ag, respectively. The content of atomic silver increased…
下水処理に伴って排出される下水汚泥は、脱水・焼却などの工程を経て処理され、その後、埋立てや再資源化工程へと流れていく。現在、各自治体ごとに様々な汚泥再資源化のあり方が試みられているが、持続可能な汚泥の処理・再資源化を考えていくためには、それぞれの工程におけるエネルギー効率性が重要な要素の一つである。本研究では、東京都の汚泥処理・再資源化施設における複雑な汚泥のフローを把握し、そのフローもとにして汚泥処理工程、再資源化工程にて消費される年間のエネルギー量と二酸化炭素排出量の算出を試みた。また、汚泥再資源化施設における3つの再資源化工程でのエネルギー消費量を相対比較することで、それぞれの工程におけるエネルギー効率性を相対的に把握した。…
Two kinds of commercially available preformed magnesia alumina spinels, characterized through chemical analysis and X-ray diffraction methods, were utilized in different concentrations in a high alumina based refractory castable composition. After being fired at elevated temperatures, those two types of spinel bonded…
Electronics is different from power electrical engineering in two major respects. The range of frequencies involved is typically restricted to 1 kHz in power electrical engineering, whereas it extends to the microwave regime, beyond 1 GHz, in electronics. The excitation level of magnetic materials is near saturation i…
Results of detailed calculations for SrTiO3 (100) surface relaxation and the electronic structure for the two different terminations (SrO and TiO2) are discussed. These are based on ab initio Hartree‐Fock (HF) method with electron correlation corrections and Density Functional Theory (DFT) with different exchange‐corr…
Thermal reactions of sputtered Cu films on the fluorinated silicon oxide (FSG) and organosilicate glass (OSG) layers, with and without TiN or TaN diffusion barrier, were investigated. The sheet resistance, surface morphology, phase formation and compositional depth profile of the mutilayer structures after vacuum anne…
To evaluate crack initiation from small radius flaws in Zr-2.5 Nb pressure tubes in operating CANDU reactors, a number of crack initiation tests under both monotonic and cyclic loading in notched tension specimens have been carried out at ambient temperature. Test specimens were machined with the tensile axis parallel…
This paper describes the relationship between hydrogen pressure and temperature (P-T curve) in the HDDR treatment of the Sm2Fe17 compound. The P-T curve suggested that the HDDR condition of the Sm2Fe17 compound is more sensitive to temperature than that of the Nd2Fe14B compound. It was also found that the HDDR treatme…
We studied by grazing incidence X-ray diffraction the behavior of the amorphous and crystalline diffractogram areas of corn pericarp samples taken during a typical nixtamalization process. The pericarp amorphous part suffers two dissolution processes, one fast, due to the dissolution of the water- and alkali-soluble p…
The phonons in multi‐walled carbon nanotubes (MWNTs) are studied within a force‐constant model and a continuum model. Special attention is given the low‐frequency modes that are most affected by nesting of the separate layers into a MWNT. First, a MWNT has four acoustic branches, which determine its elastic properties…
Small amounts of aluminum (1 to 3 wt% Al) were alloyed with copper to study oxidation resistance at high temperatures. Pure copper and the alloyed samples were oxidized from 700 to 1000 °C in air for various lengths of time. The oxidation rates of the samples increased with temperature. The oxidation rates of pure cop…
A conceptual-scale continuous pyroelectric converter was constructed and tested. Low-grade heat was converted to electricity using a single 25 @ m thick 60%-40% P(VF 2 -TrFE) copolymer film. A pyroelectric conversion cycle conceived by Olsen was adopted; external control voltage was cycled between high and low in sync…
α′-SiAlON containing Sr, having a large ionic radius, was obtained by hot-pressing. Sr was accommodated in α′-SiAlON in conjunction with Y. The effect of adding Sr to Y-α′-SiAlON on thermal conductivity and mechanical properties was studied. Thermal conductivity decreased from 11.9W/m·K to 6.2W/m·K with increasing add…
A stochastic model for predicting the strength and reliability of unidirectional fiber-reinforced ceramic matrix composites is proposed, in order to find theoretically statistical properties in strength of the composites, composed of constituents with large variations in strength. In the proposed model, mechanical beh…
Based on the analysis of the K 2 O-P 2 O 5 -D 2 O solubility phase diagram, the optimum conditions of KD 2 PO 4 crystallization—the compositions of mother solutions and the temperature range of crystallization—in the KH 2 PO 4 -D 2 O system have been determined. The technique of K(D x H 1 − x ) 2 PO 4 growth is develo…
We have investigated an effect of vanadium or aluminum into titanium alloys on the formation of Kirkendall voids in titanium region in diffusion bonds between titanium and molybdenum. The influence of bonding conditions on the joint stregnth has been also investigated. The bondings were performed under bonding tempera…
アミロペクチンからなるワキシコーンスターチを用いてアクリル酸デンプンを合成し，さらに架橋することによりデンプンの機能化を検討した．高置換度のアクリル酸デンプンは，ピリジン中でデンプンにアクリル酸無水物を作用させることによって得られた．高置換度アクリル酸デンプンを用いた重合では，分枝構造による立体障害などによって架橋ポリマーを得ることができなかったが，高置換度アクリル酸デンプンとアクリル酸とを共重合すると，架橋反応物が得られた．この共重合体の架橋部分は重合度の低いアクリル酸重合体であり，生分解性ポリマーの原料として用いることができると思われる．一方，低置換度アクリル酸デンプンとアクリル酸との共重合では，架橋デンプンは得られなかった．
(2002). Producing copper‐plated welding wire. Welding International: Vol. 16, No. 8, pp. 666-668.
A small amount of LaAlO3 added to a La2O3:3TiO2 starting oxide mixture stabilizes the A-deficient La2/3TiO3 perovskite structure. According to XRD and microstructural investigations of samples prepared in the ternary system at 1400?C, only the solid solution along the La2/3TiO3-LaAlO3 tie-line extends from at least 4…