Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Die ersten Monoarenkomplexe von Gallium(I) wurden aus Ga2X4 (X = Cl, Br), in Toluol suspendiert, und Hexamethylbenzol erhalten. In 1b sind C-1 und C-4 des Arenliganden zum GaI hin verschoben: 1b kann somit sowohl als π-Komplex als auch als nido-Cluster angesehen werden.
A variety of techniques involving electrochemical, hydrogen permeation and acoustic emission measurements have been used in studying the stress corrosion cracking of initially smooth and pre-cracked specimens of a maraging steel in different chloride-containing solutions. In solutions having pH's in excess of 2, crack…
Poly crystalline and single‐crystalline α‐alumina were reacted with a eutectic CaO‐Al 2 O 3 melt at 1530°C. A reaction zone develops in which a strongly textured CA 6 layer, as well as a CA 2 layer, forms, with a remaining layer of unreacted CaO‐AI 2 O 3 melt. Silica, an impurity in the α‐alumina, is rejected by the a…
Hardness and compressive strength, Young's modulus, bend strength, and fracture toughness were measured in wrought and commercially sintered T42 high-speed steel. After identical heat treatments, no significant differences were found between wrought and sintered materials in hardness (800–1010 HV50), Young's modulus (…
Abstract— An analysis is presented of factors causing fatigue crack resistance in metals exposed to liquid corrosive environments. A new approach involving invariant diagrams is proposed that takes simultaneous account of the stress‐strain state and the electrochemical conditions at the tip of a crack. Variations in e…
Interactions between metal ions and chitosan in solution were studied by spectroscopic and viscometric measurements. $Cu^{++}$-chitosan complex exhibited an absorption band at 265 nm, whereas D-glucosamine complex showed one at 245 nm. The difference in ${\lambda}_{max}$ was attributed to the different amine to $Cu^{2…
A high frequency, high resolution dynamic ultrasonic skin-scanner is described. The skin-scanner is shown to give a cross-sectional image of the skin and provides an accurate, simple and non-invasive method for measuring full-thickness human skin. In addition to the skin thickness it is demonstrated that the underlyin…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA General Use of Amberlite XAD-2 Resin for the Purification of Flavonoids from Aqueous FractionsKarl-Heinz Rosler and Robert S. GoodwinCite this: J. Nat. Prod. 1984, 47, 1, 188Publication Date (Print):January 1, 1984Publication History Published online1 July 2004Published in…
Hexathio-18-crown-6 wraps around CoII to yield a rare example of a low-spin octahedral CoII complexe, as shown by structural, magnetic, and e.s.r. studies.
Charge/pH isotherms are reported for various cellulose fibres: cotton linters, bleached sulphate pulp and unbleached sulphate pulp. This charge was determined as a function of pH for 1.0, 0.1, 0.01 and 0.001 mol dm–3 NaCl. The effect of various cations on the charge on bleached sulphate pulp was also investigated. The…
Smooth, adherent coatings of molybdenum can be obtained electrolytically on nickel and copper substrates in KF–Na2B4O7–K2MoO4 fused salts at temperatures 998–1173 K and current densities 110–550 A/m2 with a molybdenum anode and a graphite anode. The KF–K2MoO4 and Na2B4O7–K2MoO4 fused salts do not give any deposits of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleEffect of crystal quality on the spin-transition behavior in a cobalt(II) complexE. W. Mueller, H. Spiering, and P. GuetlichCite this: Inorg. Chem. 1984, 23, 1, 119–120Publication Date (Print):January 1, 1984Publication History Published online1 May 2002Published inissue 1 Janua…
Mössbauer and magnetic susceptibility measurements of iron(II) phthalocyanine in the temperature range between 77 and 300 K have been carried out. The crystal field parameters and the electronic structure of the Fe(II) ion have been obtained using a least-squares fitting procedure of the dependence on the temperature…
Materials for high brightness cathodes are evaluated by defining a figure of merit, which is based on the Richardson–Dushman equation. By calculating the figure of merit of borides, carbides, nitrides, and some refractory metals, it is concluded that carbides of transition metals such as TiC, ZrC, TaC, and HfC are pro…
Solid-state 31P and 29Si n.m.r. spectroscopy has been used to characterise a number of heteropolyanion salts. A significantly larger chemical shift anisotropy was seen for the phosphorus in the dimeric P : Mo = 2 : 18 Dawson structure than for the P : Mo = 1 : 12 Keggin unit. Two inequivalent phosphorus sites are seen…
The preparation and spectroscopic data of FeTMP(ClO4)2[(1), TMP = 5,10,15,20-tetramesitylporphyrinato] are reported; the reaction of (1) with NaOMe–MeOH gave a new red species, (2), which is indicated to exist (a) as a symmetrically ligated complex with a vacant dx2–y2 iron orbital (1H n.m.r.)and (b) in the iron(IV) s…
Over the years, several mathematical models have been proposed for predicting the critical withstand voltage of polluted insulators, mainly based on the static arc voltage-gradient equation of the type E = Ai−n. The paper proposes a new mathematical model which is based on a dynamic arc voltage-gradient equation. Comp…
There are a few reports that Cu sulfides precipitate with the addition of Cu in the grain-oriented silicon steel, but the precipitates of Cu sulfides have not yet been well observed Thus, the observation of the precipitation of Cu sulfides is performed and the metallurgical effects of Cu addition on the grain-oriented…
Abstract The Rheometrics mechanical spectrometer has been employed in the parallel plate mode to study the rheological behavior of pure polypropylene resin and melts filled with 10, 20, 30, and 40 percent by weight glass fibers. Steady‐state shear data show that, for loadings above 20 percent fiber, increasing fiber l…
A quasi-isothermal method of operating an absorbed-dose graphite calorimeter is described in theory and practice. In contrast with the well-known quasi-adiabatic operation, which entails temperature increases during measurements, in the quasi-isothermal mode the temperatures of the different graphite bodies remain con…