Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA simple relationship between rate of color change and molecular weight of a photochromic spiropyran polymerEfim Goldburt and Valeri KrongauzCite this: Macromolecules 1986, 19, 1, 246–247Publication Date (Print):January 1, 1986Publication History Published online1 May 2002Pu…
The combined representation of experimentally determined crystal structures and calculated periodic potential surfaces is possible with a new program system. It is shown that the zero potential surfaces in particular are topologically very similar to the corresponding periodic minimal surfaces of the same symmetry. Th…
In some N(p-n-alkoxy benzylidene) p-n-alkylanilines the refractive indices ne, no and the order parameter are measured as a function of temperature. From the experimental data the molecular polarizabilites and its anisotropies at different wavelengths were calculated using different internal field models. The merits o…
This paper describes the utility of acoustic emission (AE) for the detection and monitoring of corrosion, stress corrosion cracking (SCC), and corrosion fatigue (CF). It comprehensively surveys laboratory studies and field applications that have been made to date. How to apply the technique to fundamental studies in t…
The first synthesis of two covalently linked mixed phthalocyanine–porphyrin dimers especially designed for the study of photoelectron processes is presented along with the very efficient intramolecular energy transfer from the porphyrin toward the phthalocyanine moiety under light irradiation in one of these compounds.
Muon-spin-rotation experiments were performed on the ferromagnetic compounds ${\mathrm{GdFe}}_{2}$, ${\mathrm{GdCo}}_{2}$, ${\mathrm{YFe}}_{2}$, ${\mathrm{LuFe}}_{2}$, and ${\mathrm{ErFe}}_{2}$. The local magnetic field at the positive-muon site and the muon-spin-relaxation rates were measured as a function of tempera…
The nuclear-magnetic-resonance method was used to study the diffusion of hydrogen in zirconium hydride by measuring the temperature dependence of ${T}_{1}$ in a temperature range where the major relaxation mechanism was due to hydrogen diffusion. The samples investigated were ${\mathrm{ZrH}}_{1.588}$, ${\mathrm{ZrH}}_…
We have used a cloned chicken collagen cDNA sequence to help identify hypothetic members of the collagen gene family from Drosophila melanogaster. Several experimental evidences have been obtained which indicate that the Drosophila genome contains numerous collagen-like sequences. We have characterized in more detail…
The diffusion of hydrogen in nickel and copper, and in fcc nickel-copper and nickel-cobalt alloys has been investigated over the temperature range from 260 to 1000 K by a technique of electrochemical permeation and a technique of gas phase permeation. The temperature dependence of the diffusion coefficient of hydrogen…
塩化チタン(IV)やチタンテトライソプロボキシドを加水分解して得た含水酸化チタン(IV)について,示差熱重量分析とX線回折を行ない,100℃ から1000℃ までの各温度で焼成し酸化チタン(IV)(TiO2)とした。このTiO2のほかに市販TiO2および酸素欠損を有するTiO2-xについて,XPS,PAS,ESRなどによるキャラクタリゼーションおよび2-プロパノール(i-PrOH)水溶液中での光脱水素反応に対するこれらの酸化チタンの光触媒活性の評価に基づいて,これら酸化チタンの製法と物性との関連性について調べた。TiO2の結晶構造の違いによりXPSのO2Pノミンドスペクトルは変化するが,製法による差異は認められなかった。紫外・可視…
The effects of surface microstructure and chemical compositions on characteristics of Fe-Zn compounds which formed on continuously galvanized steel sheets have been investigated by using ultra low carbon and low carbon steels.From SEM observation, morphology of Fe-Zn compounds formed at interface between steel and pla…
Effects of thermo-mechanical treatment on the shape memory effect and the pseudoelasticity of a near equiatomic Ti-50.2Ni (at%) and a ternary Ti-47.5Ni-2.5Fe (at%) alloy were investigated by tensile tests for specimens which were cold rolled and subsequently annealed at temperatures between 400°C and 600°C. It has bee…
Photoelectron spectroscopy has established that although the hydrogen halides (HC1 and HBr) are not chemisorbed at a Pb(110) surface, chemisorptive replacement of preadsorbed oxygen leads to the formation of a halide overlayer in the temperature range 100–295 K. Surface oxygen plays a dual role, activating the hydroge…
Abstract The bond lengths, edge lengths and angular distortions were evaluated for 311 TO 4 units of distorted tetrahedral symmetry for 16 T elements in 191 compounds and for three ZnCl 4 units. The bond length distortions increase fairly regularly with decreasing size of the central ion while the edge lengths and ang…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation, characterization, and chemistry of activated cobaltGary L. Rochfort and Reuben D. RiekeCite this: Inorg. Chem. 1986, 25, 3, 348–355Publication Date (Print):January 1, 1986Publication History Published online1 May 2002Published inissue 1 January 1986https://pubs.…
A novel pillared synthetic saponite, prepared by exchanging Na+ in the interlayer of saponite [idealized formula; Na+x(Mg3)oct.(Si4 –xAlx)tet.O10(OH)2] with an Al hydroxy cluster cation followed by calcination, gives a high catalytic activity and a high yield of p-xylene isomer for toluene alkylation by methanol.
Composite prismatic strucure has been examined in Nuculidae, Lucinidae, Cardiidae, Tellinidae, Psammobiidae, Donacidae and Veneridae. This microstructure is divided into three basic structural varieties: typical composite prismatic, characteristic of Nuculidae (Nucula); fibrous composite prismatic, observed in Cardiid…
This paper addresses problems involved in measuring fracture toughness of thin pressure tube material which, in the presence of radial-axial hydrides, undergoes a significant brittle to ductile fracture transition. Compact tension specimens (∼5 mm thickness) are machined from flattened tensile strips of Zircaloy-2 in…
The decarburization and surface oxidation reactions were observed during the decarburization annealing cycle of a 3 wt–%Si regular grain oriented electrical steel. Annealing was carried out at four H2O/H2 ratios in the range 0·14–0·7 and three temperatures (787, 843, and 899°C) for time periods of up to 30 min. Gravim…
Based on a review of hydrogen injection test at BWRs, several possible factors were selected and studied to refine the radiolysis model previously proposed by the authors. The differences between calculated and measured dissolved oxygen concentrations were reduced 40% at low hydrogen concentration (<40 ppb) in reactor…