Materials Literature
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Turbulent convection in silicon melts used in the Czochralski crystal‐growth method was found to be effectively suppressed by applying a transverse magnetic field over 2000G. When turbulent convection is suppressed, it was found that the oxygen concentration in the resulting silicon crystals could be precisely control…
Voids in the aluminum metallization of integrated circuits can be created under certain device fabrication conditions. The formation and characteristics of these defects have been studied in detail. It is found that the density and size of the metal voids have a strong functional dependence on the compressive stress o…
Abstract Hydrogenation of polybutadienes with from 8 to nearly 100% vinyl content was used to prepare a series of model copolymers of ethylene and butene‐1 with uniform microstructures and narrow molecular weight distributions. They range from readily crystallizable to completely amorphous, depending on the frequency…
A fully quantum mechanical model of the particle–surface sticking process is developed, and calculations are performed for a variety of atoms, molecules and solids of relevance to the interstellar medium. The sticking coefficient is a sensitive function of the nature of the particle–surface interaction and the lattice…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCatalytic electroreduction of molecular oxygen using iron or cobalt 4,4',4",4'"-tetracarboxyphthalocyanineNagao Kobayashi and Yoshiyuki NishiyamaCite this: J. Phys. Chem. 1985, 89, 7, 1167–1170Publication Date (Print):March 1, 1985Publication History Published online1 May 20…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure evolution during spinodal decomposition of polymer blendsGert R. StroblCite this: Macromolecules 1985, 18, 3, 558–563Publication Date (Print):March 1, 1985Publication History Published online1 May 2002Published inissue 1 March 1985https://pubs.acs.org/doi/10.1021/m…
An adiabatic scanning calorimeter has been used to investigate the temperature dependence of the enthalpy and the heat capacity near the smectic A (A) to nematic (N) phase transition in mixtures of alkylcyanobiphenyl (nCB) liquid crystals. Mixtures of 8CB + 10 CB with small N-ranges undergo first-order transitions, bu…
Abstract Greenhouse and laboratory experiments were conducted to characterize the K supply and nonexchangeable K release kinetics in calcareous soils. Twelve soils were exhaustively cropped with alfalfa ( Medicago sativa L.) in the greenhouse for 584 d (16 cuttings). Yield, K uptake, and changes in NH 4 OAc exchangeab…
A series of 7-(substituted aryl)-3,5-dihydroxy-6-heptenoic (heptanoic) acids and their lactone derivatives have been prepared and tested for inhibition of 3-hydroxy-3-methylglutaryl-coenzyme A reductase in vitro. A systematic exploration of the structure-activity relationships in this series led to the synthesis of (+…
The glass‐forming region for calcium aluminosilicate glasses has been determined. A number of properties of these glasses (thermal expansion coefficient, glass transformation and dilatometric softening temperature, and refractive index) have been studied. The results of these measurements suggeq that the structures of…
A maximum entropy method (MEM) map of electron density is obtained by maximizing S = -Σ p log p subject to whatever data are available. MEM is derived as the only reconstruction technique that is consistent with simple and general requirements. The method is very widely applicable, but, in this paper, attention is foc…
A simple thermodynamic model describing hydrous silicate melts has been applied to the systems albite-, diopside-, and silica-$$H_{2}O$$. The model is based on the assumption of ideal mixing of hydroxyl groups, $$H_{2}O$$ molecules, and oxygens in the melt. Calculated and experimentally determined freezing-point depre…
The crystallization kinetics of unfilled and glass-reinforced grades of polyphenylene sulfide has been investigated by using differential scanning calorimetry. The maximum rate of crystallization is observed at about 170°C. From the crystallization data, it is recommended that the molding parameters should be so speci…
In this work the reactions taking place during melt mixing of bisphenol-A polycarbonate (PC) with poly(ethylene terephthalate) (PET) were studied by selective degradation of PC sequences, solubility tests, and IR spectroscopy. It was found that exchange reactions between PC and PET took place, contrary to what has bee…
Polyaniline, (4oSN) is found to exhibit a low energy absorption edge beginning near 1800 cm−1 (ca: 0.22 eV), and a strong anion-induced absorption from about 800 to 1200 cm−1. Electrical conductivity has an activation energy of 0.05 (15%) eV consistent with an anion-induced energy gap of about 0.1 eV.
The theoretical basis for the use of paramagnetic agents to enhance proton relaxation is described. Factors of importance in the design of contrast agents are considered. Measurements of changes in T1 and T2 in vitro due to Gd3+-diethylenetriamine pentaacetic acid (DTPA) are used to predict changes in the intensity of…
Gadolinium-DTPA complex (Gd-DTPA) is a potential clinical magnetic resonance (MR) contrast agent that enhances images primarily by decreasing spin-lattice relaxation time (T1) in tissues in which it localizes. This study was designed to determine the immediate tissue distribution of intravenously administered Gd-DTPA…
Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text Joseph L. Horner and James R. Leger, "Pattern recognition with binary phase-only filters," Appl. Opt. 24, 609-611 (1985) Export Citation BibTex Endnote…
The dc conductivity of hexagonal boron nitride (BN) and BN‐containing composites was measured as a function of temperature up to 2400°C. The results confirm that at high temperatures BN is an intrinsic semiconductor with an energy gap of 0.99 ± 0.06 aJ (6.2 ± 0.4 eV) at T = 0 K. Extrapolated values for the resistivity…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEPR spectroscopic study of S = 1, 2, and 3 spin states of tris(.mu.-hydroxo)-bridged chromium(III) dimersStefan KremerCite this: Inorg. Chem. 1985, 24, 6, 887–890Publication Date (Print):March 1, 1985Publication History Published online1 May 2002Published inissue 1 March 198…