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。
As power supply frequencies approach the megahertz level, skin and proximity effects become significant factors to consider when calculating copper losses in transformers. Using electromagnetic theory and mmf diagrams in both space and time, a method that provides insight into the mechanism of skin and proximity effec…
It is now well established that thick films of transition-metal oxides such as NiO grow according to a modified Wagner mechanism by the diffusion of ions along grain boundaries in the oxide film. It is shown that the growth of thin films of this oxide is consistent with that of thick films if it is assumed that the sa…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of homopolymer molecular weight on the morphology of block copolymer/homopolymer blendsX. Quan, I. Gancarz, J. T. Koberstein, and G. D. WignallCite this: Macromolecules 1987, 20, 6, 1431–1434Publication Date (Print):June 1, 1987Publication History Published online1 Ma…
The material damping in beam-like specimens of aluminum and metal matrix com posites was measured. A unique apparatus to determine damping by free decay while the specimens are in free fall in a vacuum was used. The specimens tested include 2024-T3 and 6061-T4 aluminum, and unidirectional graphite/metal matrix specime…
Abstract Three clay samples (a kaolinite, a halloysite and an inseparable mixture of kaolinite-palygorskite-illite-montmorillonite) were, after a mild pretreatment, successfully tested as catalysts in the polymerization of styrene. The catalytic activity of the clay (measured by the conversion rate), the MW and the co…
Single‐phase solid solutions of2H crystal type in the SiC‐AIN system containing 50 and 75 mol% AIN were fabricated by hot‐pressing mixtures of SiC and AIN powders. Dense samples were subjected to thermal treatments over a range of temperatures between 1600° and 1900°C for a period of time up to 320 h. Transmission ele…
Electrochromic characteristics of familiar organic materials with relatively simple molecular structures, such as dimethyl terephthalate, are described. Coloration occurred at the cathode of all cells examined; the color spontaneously bleached upon removing the voltage. Electrochemically induced optical absorption was…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDefect-free, crystalline aromatic poly(etherketones): a synthetic strategy based on acetal monomersDonald R. Kelsey, Lloyd M. Robeson, Robert A. Clendinning, and C. Scott BlackwellCite this: Macromolecules 1987, 20, 6, 1204–1212Publication Date (Print):June 1, 1987Publicatio…
Abstract Three samples of poly(1,2‐cyclohexene oxide) were prepared with ZnEt 2 , (EtZnOMe) 4 , and [{MeOCH 2 CH(Me)OZnO(Me)CHCH 2 OMe} 2 · {EtZnO(Me)CHCH 2 OMe} 2 ] ([Zn‐MP] 2,2 ), respectively, as initiator. Each polymer sample was treated with butyllithium to form various decomposition products having double bonds…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCatalytic reactions of metalloporphyrins. 3. Catalytic modification of hydroboration-oxidation of olefins with rhodium(III) porphyrin as catalystYasuhiro Aoyama, Yasutaka Tanaka, Takeshi Fujisawa, Takamichi Watanabe, Hiroo Toi, and Hisanobu OgoshiCite this: J. Org. Chem. 198…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDivalent lanthanoid synthesis in liquid ammonia. 2. The synthesis and x-ray crystal structure of (C8H8)Yb(C5H5N)3.1/2C5H5NAndrea L. Wayda, Ishita. Mukerji, James L. Dye, and Robin D. RogersCite this: Organometallics 1987, 6, 6, 1328–1332Publication Date (Print):June 1, 1987P…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLigating properties of monomeric cis-trioxometal(VI) complexes of molybdenum(VI) and tungsten(VI). Preparation and spectroscopic characterization of LMO3 and [(LMO3)4CoII](ClO4)2 (M = Mo, W; L = cyclic triamine)Partha S. Roy and Karl WieghardtCite this: Inorg. Chem. 1987, 26…
Abstract The water absorption of cellulose fibers has been reduced after the cellulose surface was treated by mono‐ ordi‐methylomelamine(DMM) resin. The wet strength of cellulose‐polyester composites was also enhanced considerably. Scanning electron microscopy, transmission electron microscopy, and electron spectrosco…
A study of the graft copolymerization of methyl methacrylate onto jute fiber, using K2S2O8-thiourea (TU) redox-initiating system has been made. The effects of concentration of monomer, S2O, TU on graft yield have been studied. Besides the effects of time, temperature, acid, and amount of jute fiber, some inorganic sal…
For pt.I see ibid., vol.17, p.1419 (1987). Spin-density measurements for a single crystal of the FCC alloy Fe 66 Mn 34 have been performed using elastic and inelastic neutron scattering. Combining the results from elastic scattering with the experimentally determined symmetry of the spin wave spectrum it has been uneq…
Isotope effects on the ${\mathrm{BaTiO}}_{3}$ ferroelectric phase transitions and on its melting temperature are given. The materials used are a light $^{46}\mathrm{rich}$ denatured ${\mathrm{BaTiO}}_{3}$ and ${\mathrm{a}}^{134}$Ba-rich ${\mathrm{BaTiO}}_{3}$, in which the molecular weight is lighter than in naturally…
Phosphorus oxynitride (PON) glasses, prepared by remelting phosphate glasses in anhydrous ammonia vapor, are more resistant to dissolution in water and corrosion in humid environments than the parent phosphate glasses. The chemical durability of PON glasses is directly related to their nitrogen content. Solution analy…
The rate of silicon homoepitaxy from SiH4/H2 mixtures has been studied between 750 and 850 °C using a new ultrahigh-vacuum-compatible low pressure reactor. The analysis of the experimental data is novel in including the effects of both nonepitaxial deposition within the reactor and of gas pumping speed. Epitaxy by pyr…
The possible lower symmetries (subgroups) of the ${A}_{2}$${\mathrm{BX}}_{4}$ structure (space-group symmetry ${D}_{4h}^{17}$) due to rigid octahedral tiltings at phase transitions are investigated. The method for obtaining subgroups determined by reducible representations (i.e., coupled order parameters) is described…
Abstract Dimethyl 1,4‐cyclohexanedicarboxylate was treated with various potential isomerization catalysts under reflux (ca. 280°C). Lithium cloride and sulfonic acids caused rapid isomerization. Also the diphenyl ester and 1,4‐cyclohexandicarbonyl dichloride were isomerized, and in all cases a thermodynamically contro…