Materials Literature
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We report the gated detection of reflection high-energy electron diffraction (RHEED) signal intensity oscillations during molecular-beam epitaxy (MBE) while the wafer is being rotated at high speed (≳100 rpm). In general, a larger number of oscillation periods are observed with this technique than during stationary me…
Abstract The sulfur vulcanization chemistry of cis -polyisoprene formulations accelerated with N- t -butyl-2-benzothiazole sulfenimide (TBSI) is compared to the chemistry of equivalent formulations accelerated with N- t -2-benzothiazole sulfenamide (TBBS). High performance liquid chromatographic analysis (HPLC) is uti…
Two experiments on the plasma-driven permeation (PDP) of deuterium through nickel membranes were conducted. One was an observation of the permeation during the discharge cleaning of Heliotron E, one of the largest helical systems. Significant amounts of deuterium permeated. The deuterium permeation was also observed d…
In the present work, the influence of Cr on mechanical properties and microstructure of weld metal from a high-strength SMA electrode is analyzed by considering 12 experimental low-alloy low-hydrogen iron powder AWS E10018, E11018, E12018-M type covered electrodes. These electrodes were manufactured to obtain in the w…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUnprecedented Oxidative Decarboxylation of .alpha.-Amino-.alpha.-methylmalonate on a "Hindered" Cyclic TetraamineCobalt(III) ComplexMorio Yashiro, Shuji Miura, Takayuki Matsuyama, Sadao Yoshikawa, Makoto Komiyama, and Shigenobu YanoCite this: Inorg. Chem. 1994, 33, 6, 1003–1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSupercritical Fluid Fractionation of a Low Molecular Weight, High-Density Polyethylene Wax Using Carbon Dioxide, Propane, and Propane-Modified Carbon DioxideJim C. Via, Cheryl L. Braue, and Larry T. TaylorCite this: Anal. Chem. 1994, 66, 5, 603–609Publication Date (Print):Ma…
A two-dimensional mathematical model of the carding process considers the lon gitudinal transport of fibers on the surface of the main cylinder and fiber diffusion in the transverse direction. The weight functions of the dynamic model in the longitudinal and transverse directions are derived, and the two-dimensional t…
The effects of TiC addition to Si 3 N 4 on microstructure and the chemical aspects of Si 3 N 4 –TiC interphase reaction were investigated in samples hot‐pressed at 1800°C in Ar and N 2 . Composition of a TiC 1–x N x solid solution was predicted based on thermodynamic calculation, with titanium carbonitride taken to be…
ABSTRACT Kinetic models for changes in muscle pH and beef quality, based on press juice and puncture strength, were determined during beef carcass chilling. Changes in quality of Longissimus dorsi muscle during chilling were determined and modeled using reaction kinetics and Eyring's absolute reaction rate theory. The…
The Stefan problem with surface tension in the three-dimensional case with spherical symmetry is considered. We first establish the existence and uniqueness of the classical solution with surface tension and kinetic undercooling effects for all time, and then pass to the limit as the kinetic undercooling tends to zero…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTQuaternized Poly(4-vinylpyridine) Gel-Coated on Silica.Fast Kinetics of Diffusion-Controlled Sorption of Organic SulfonatesManas Chanda and Garry L. RempelCite this: Ind. Eng. Chem. Res. 1994, 33, 3, 623–630Publication Date (Print):March 1, 1994Publication History Published…
Abstract Eu 2 SiO 3 Cl 2 and Eu 5 SiO 4 Cl 6 were prepared by reaction of EuCl 2 with EuSiO 3 and Eu 2 SiO 4 , respectively, Sr 2 SiO 3 Cl 2 : Eu 2+ from mixtures of SrCO 3 , Eu 2 O 3 , SrCl 2 · 6H 2 O and SiO 2 under reducing conditions. The crystal structures of Eu 2 SiO 3 Cl 2 [a = 1118.7(5), c = 952.6(1) pm, tetra…
alpha-Ketoglutarate dehydrogenase (E1k), also designated oxoglutarate dehydrogenase (OGDH; EC 1.2.4.2), is a component of the enzyme complex that catalyzes the conversion of alpha-ketogluterate to succinyl coenzyme A, a critical step in the Krebs tricarboxylic acid cycle. Deficiencies in the activity of this enzyme co…
Abstract Because of differences in chemical structure and rheological characteristics, high density polyethylene (HDPE) and poly(ethylene terephthalate) (PET) are incompatible when blended during recycling of PET soft drink bottles. To improve the properties of the blends, ethylene vinyl acetate copolymer (EVA) was us…
Abstract Polymer blends can undergo, during processing, degradation phenomena because of the presence of both temperature and mechanical stresses. With respect to pure homogeneous polymers, the degradation of polymer blends shows distinct features because of the possible interaction between the different chemical spec…
Abstract New π-conjugated polymers having quinone units as the recurring units, e.g., poly(2-methyl-9,10-anthraquinone-1,4-diyl) P(Me-1,4-AQ) with molecular weight of 56000, have been prepared by dehalogenation polycondensation of dichloroquinones. P(Me-1,4-AQ) exhibits unique redox behaviors due to electronic interac…
Heat capacity of the perovskite NdGaO/sub 3/ has been measured in the range of 0.15 K>
This contribution is concerned with molecules composed of rigid linear segments which are connected in such a way that a λ-shape results. Such types of shape have been predicted to lead to an enhanced solubility in low molar mass solvents and in the melt state of flexible chain molecules. The theoretical treatment pre…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProtection and Polymerization of Functional Monomers. 20. Anionic Polymerizations of 4-Vinylphenyl tert-Butyldimethylsilyl Sulfide and 2-(4-Vinylphenyl)ethyl tert-Butyldimethylsilyl SulfideAkira Hirao, Hideki Shione, Sumio Wakabayashi, Seiichi Nakahama, and Kazuo YamaguchiCi…
The carbon-13 chemical shifts of several substituted nitrosobenzenes are reported. It is shown that the NO group can be orientated to lie in the plane of the ring when constrained either by a bulky ortho substituent or in the solid state. In the presence of 2,6-di-tert-butyl substituents the NO group is twisted into o…