Materials Literature
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This paper presents the results of the investigation of dielectric dispersion in semiconductive ferroelectric Sn2P2S6 crystals over the frequency range 1 kHz to 78.5 GHz. The main dielectric dispersion in Sn2P2S6 is caused by the soft ferroelectric Bu mode and in the vicinity of the Curie point it occurs in the millim…
The effect of wettability of 14 polypeptide derivatives upon adhesion and activation of platelets was investigated with reference to release reactions from adhered platelets, using radioisotope labeling and radioimmunoassay method. The serotonin release was more significant from platelets adhered to polymer materials…
An experimental study to evaluate and characterize the effects of inverted density layers during the directional solidification of metal alloys is described. The temporal history of the inverted density layers in front of a dendritic interface for directionally solidified ammonium-chloride 72-wt-% water is presented b…
Abstract Discrimination of elastically and inelastically scattered electrons in transmission electron microscopy (TEM) yields electron micrographs with enhanced and specific contrast. Highly resolved micrographs can be obtained in which the contrast reflects the local concentrations of specific elements. In the presen…
A proposal to abandon the current sophisticated index scheme of the Al-Mn decagonal phase has recently been advanced (Fitz Gerald, Withers, Stewart and Calka 1987), in favour of a new straightforward description. This description is based on a periodic stacking of Penrose lattices which are two-dimensional, using the…
Abstract Epoxides bearing aryl, alkenyl, alkynyl, and trimethylsilyl substituents react with titanium acetylides at the higher substituted carbon atom exclusively; the 2‐substituted 3‐butyn‐1‐ols thus formed are isolated in 33–79% yield. The dependence of the yield on the solvent, the ratio of the reactands, and their…
Neps appearing in all stages of textile processing up to the dyed fabric were extracted from cotton samples. These neps were disassembled and the individual fibers making up each nep, along with any foreign material appearing in the nep, were studied using microscopic techniques. Three distinct types of neps could be…
Abstract The rates of epoxidation of polybutadiene homopolymers and styrene–butadiene triblock copolymers with monoperoxyphthalic acid were measured at four temperatures in homogeneous solution. Dioxane and mixed solvents with chloroform were used as reaction media. Activation energy values were also calculated for po…
In a laboratory setting, 10 new ceramic cup soil solution samplers, 10 samplers used 1 yr, and 10 used 6 yr were tested for consistency and uniformity of results. The new cups were flushed with acid and distilled water. The ceramic cups that had been installed in the field 6 yr produced samples with Mg, Na, NO3, and K…
A summary of recent studies on the corona treatment of films is presented. Chemi cal functional groups generated by the corona discharge on these films are identified and their effect on mk film wettability and adhesion discussed.
Evidence for a toughening contribution from domain switching, a deformation mode akin to twinning, has been sought in uniaxial tension and compression, biaxial compression, and on the fracture surfaces of several tetragonal zirconia polycrystalline (TZP) ceramics. Only in biaxial compression was domain switching found…
Poly(methyl methacrylate) (PMMA) films of approximately 2.5 μm have been irradiated to various doses using Al x rays. The effect of this irradiation is shown by monitoring the variation in intensity of the Raman vibrational bands of the major constituent species of PMMA, as a function of dose. It is shown that at low…
Abstract Dilation of poly(vinyl benzoate) and poly(vinyl butyral) accompanying sorption of carbon dioxide is measured with a cathetometer under pressures up to 50 atm at 25°C. Sorption isotherms for carbon dioxide in these polymers were also determined gravimetrically. Each dilation isotherm plotted versus pressure, a…
Field studies were conducted in Lemont, Ill., to evaluate specific adsorbents and reverse osmosis (RO) membranes for removing radium from groundwater. A radium‐selective complexer and barium‐sulfate‐loaded alumina appeared to have the best potential for low‐cost adsorption of radium from raw water or ion exchange brin…
All of the optical isomers of the muscarinic antagonists 3-(1-azabicyclo[2.2.2]octyl) alpha-hydroxy-alpha,alpha-diphenylacetate (3-quinuclidinyl benzilate, QNB, 1) 3-(1-azabicyclo[2.2.2]octyl) xanthene-9-carboxylate (3-quinuclidinyl xanthene-9-carboxylate, QNX, 2), and 3-(1-azabicyclo[2.2.2]ocytl) alpha-hydroxy-alpha-…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and physical properties of a dinuclear tantalum/cobalt radical with spin localized at one metal centerKaren I. Goldberg and Robert G. BergmanCite this: J. Am. Chem. Soc. 1988, 110, 14, 4853–4855Publication Date (Print):July 1, 1988Publication History Published onli…
The mechanism of expression of the overlapping genes that encode the alpha and beta subunits of aspartokinase II of Bacillus subtilis was studied by specific mutagenesis of the cloned coding sequence. Escherichia coli or B. subtilis VB31 (aspartokinase II-deficient), transformed with plasmids carrying either a deletio…
During the service life of gas-filled cellular plastics ( GFCP), air diffuses into the foam cells and the gaseous blowing agent diffuses out, each at a rate that depends on the type of polymer and temperature. This process, which reduces the effectiveness of insulation, is known as aging. This paper presents a model f…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural and magnetic properties of dimorpholinium hexahalodicuprate(II) salts: study of two planar Cu2X62- dimersBrian Scott, Urs Geiser, Roger D. Willett, Baldev Patyal, Christopher P. Landee, Robert E. Greeney, Tiziano Manfredini, Gian Carlo Pellacani, Anna Bonamartini…
The authors formulate and solve the problem of sizing power/ground (p/g) nets in integrated circuits composed of modules, where the nets are routed as trees in the channels between the modules. Constraints are developed to maintain proper logic levels and switching speed, to prevent electromigration, and to satisfy ce…