Materials Literature
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Two binary mixtures of polar liquid crystal materials were previously reported to exhibit three incommensurate smectic A phases predicted for such materials on the basis of phenomenological theory. Results of our recent high-resolution X-ray scattering experiments show that no incommensurate phases exist in the two sy…
Motivated by the need for highly efficient far-IR Fabry-Perot étalons for airborne and space astronomy, we have developed a high-yield photolithographic technique for producing low-loss metal-mesh reflectors. We describe the production technique and report on the mesh flatness and uniformity. Optical measurements of m…
A new first principle approach to the problem of ferroelectric instability is advanced. This model-free approach permits to investigate the role of dipolar forces in the origin of ferroelectric instability in crystals of arbitrarily low ionicity possessing finite but anyhow small dielectric gap width in the electronic…
SUMMARY The results of a laboratory study carried out to investigate copper deposition and localized corrosion on API N-80 carbon steel are presented. Hydrochloric acid-based stimulation fluids and a recovered worn-out acid sample from the field were used in the tests. To all the tested fluids a copper-based corrosion…
We have studied the static magnetic properties of nanocrystalline Co-Ti doped barium ferrite BaFe/sub 10.4/Co/sub 0.8/Ti/sub 0.8/O/sub 19/. The zero-field-cooled (ZFC) and field-cooled (FC) processes show the typical features of a small particle system. The dependence on temperature of the coercive field is discussed…
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…