Materials Literature
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Abstract In Auger electron spectroscopy, both the primary electrons entering the sample and the Auger electrons leaving the sample may suffer strong diffraction effects. On well‐ordered single‐crystal surfaces, diffraction effects may result in variations in the intensity of an Auger peak by a factor of up to two or m…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMultinitrogen heteroaromatics studied at Pt(111) surfaces by EELS, Auger spectroscopy, and electrochemistry: pyrazine, pyrimidine, pyridazine, 1,3,5-triazine, and their carboxylic acid derivativesScott A. Chaffins, John Y. Gui, Chiu Hsun Lin, Frank Lu, Ghaleb N. Salaita, Don…
Penetration of high-speed targets, such as missiles or satellites, involves a glancing impact resulting from the velocities of the target and the projectile not necessarily being parallel to one another. Glancing is different from oblique impact in that here the target is in lateral motion relative to the projectile (…
A mechanism is proposed to describe the influence of redox reactions, which involve variable‐valence ions, on the diffusional mass transport of molecular dissolved oxygen in glassmelts. The concentration profile for molecular dissolved oxygen in a melt with diffusional transport in one direction in a Cartesian coordin…
The full infrared spectrum of well ordered N2O4(D2h) thin films is reported. Improved sample crystallinity is reflected in a fine structure of the internal mode bands that is less complicated than previously reported, and in a well resolved phonon spectrum. New assignments, notably for the v10(B2u) internal deformatio…
The development of dense polyphase tailored ceramic forms for the immobilization of high‐level nuclear wastes has been extended to an Idaho Chemical Processing Plant Fluorinel composition. The ceramic was designed to maximize waste loading and subsequent waste volume reduction without sacrificing chemical durability i…
Convergent‐beam electron diffraction and diffuse darkfield imaging of transmission electron microscopy were used to obtain qualitative information regarding the distribution of impurities in polycrystalline AIN. Impurities are distributed homogeneously within the grains of a given ceramic, but an amorphous grain‐bound…
A CrCr distance of only 2.394(1) Å was found in the binuclear complex 2, obtainable by decomposition of 1. Extended Hückel calculations gave five energetically similar frontier orbitals for six electrons. The high magnetic moment (μeff = 3.3μB) indicates the presence of a CrCr single bond.
Durch Platin‐katalysierte Hydrosilylierung zu Siliciumcarbid‐Keramiken: Das Vinylsilan 1 reagiert zu Oligomeren des Typs 2 , die mit LiAlH 4 zu den entsprechenden Wasserstoffverbindungen reduziert werden können. Diese ergeben bei der Pyrolyse in einer Ausbeute von etwa 32% (Theorie 69%) einen keramischen SiC‐Rückstand…
Three flavone glycosides have been hoisted from the fresh vegetative part of the medicinal herb Caralluma tuberculata. The chemical and spectroscopic properties are consistent with structures of Luteolin.4'-beta-D-glucopyranosyl-(2-->1)-alpha-L-rhamnopyranoside [1], Kaempferol-7-O-beta-D-glycopyranosyl (2-->1)-alpha-L…
The results of an investigation of the dielectric strength of lichen-contaminated insulators removed from actual transmission lines of three different countries are reported. All of the insulators showed low equivalent salt-deposit density. It seems that lichen on its own cannot cause flashover of the insulators. Flas…
Chi-phase precipitation was observed by transmission-electron microscopy (TEM) in Mo-30at.%Re and Me-27at.%Re specimens that had been irradiated with 1·8 MeV He ions at temperatures from 750°C to 1075°C. The precipitates formed at the rhenium-rich external surface and adopted both parallel and (111) twin orientations…
Ab initio calculations at the Hartree-Fock SCF level have been carried out to determine the pair interaction between the alkali ions and the carbonate ion. A distinction has been made between terms in the metal ion - carbonate ion interaction which have different physical origins, such as static coulomb interaction, s…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structures and magnetic behavior of two novel copper(II) halide chains. (C7H10N)4Cu5Cl14 and (C5H14N)4Cu5Cl14: multiple copper(II) halide coordination geometriesMarcus R. Bond, Roger D. Willett, and Gerald V. RubenackerCite this: Inorg. Chem. 1990, 29, 15, 2713–2720P…
A series of novel specifically substituted 6-O-trityl-2,3-O-alkyl cellulose derivatives have been prepared by the reaction of triphenylmethyl (trityl) cellulose in DMSO with powdered sodium hydroxide and an alkyl iodide (iodohexane, iodopentane, and iodobutane). These derivatives form lyotropic chiral nematic mesophas…
Abstract The mutual miscibility of random poly (styrene‐co‐methylmethacrylate)s with different compositions but a constant molecular weight of M w ≅ 150,000 was studied at room temperature and at 180°C. Compatibility was analyzed with films cast from solutions with different solvents. The reliability of the analytical…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoinduced conformational ruffling of distorted porphyrin. Optical resolution and photochemical behavior of chiral "single-armed" porphyrin complexesKatsuaki Konishi, Kazuharu Miyazaki, Takuzo Aida, and Shohei InoueCite this: J. Am. Chem. Soc. 1990, 112, 14, 5639–5640Publi…
A protein factor with an estimated molecular mass of 50 kDa has been purified to homogeneity from the silk gland of Bombyx mori. In the presence of a molar excess of this factor and eukaryotic DNA topoisomerase II, relaxed circular DNA is converted to the negatively supercoiled form. Eukaryotic DNA topoisomerase I can…
Abstract Uses are growing for rubbers with varying levels of resistivity. High electrical resistivity is very much essential in wire and cable insulation applications. Low levels of resistivity are needed for electrostatic discharge in phonograph records and many medical, industrial, and military products and for semi…
The codeposition of red phosphorus particles and copper from an electrolytic bath constitutes an attractive method for the production of phosphorized copper, which is the preferred anode material in bright acid copper electroplating. The effects of suspension concentration, current density, temperature, solution addit…