Materials Literature
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Abstract Angle‐resolved XPS data from two well‐characterized samples of SiO 2 on Si were analyzed using three different algorithms for the determination of overlayer thickness. The relative ratio algorithm, the Heaviside step function approximation to the Laplace transform algorithm and the absolute ratio algorithm we…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural characterization of verdoheme analogs. Iron complexes of octaethyloxoporphyrinAlan L. Balch, Lechoslaw Latos-Grazynski, Bruce C. Noll, Marilyn M. Olmstead, Ludmila Szterenberg, and Nasser SafariCite this: J. Am. Chem. Soc. 1993, 115, 4, 1422–1429Publication Date (…
Polymeric materials and their composites have been employed in a variety of medical and surgical applications, such as tissue replacement and support. In the case of biodegradable polymers, primary areas of application include sutures, macroscopic implants for fixation, and drug release systems [1-4].
The crystal structure of the Al3Mn phase, considered to be closely related to that of decagonal auasicrystais, has been determined by a combination of single-crystal X-ray analysis and high-resolution electron microscopy. The atomic model, obtained from a Patterson synthesis and high-resolution electron microscopy, wa…
Abstract Fluorescence line narrowing (FLN) spectroscopy was used to study the vibrational features of Zn porphyrins, including Zn octaethylporphine, Zn mesoporphyrin, Zn deuteroporphyrin and Zn coproporphyrin, and the interaction of these porphyrins with their solvent matrices. A number of ground‐state vibrational lev…
The second virial coefficient for the surface tension increment of polymer solutions is evaluated for repulsive (Dirichlet) and reflecting (neutral) impenetrable surfaces. Renormalization group theory is used to describe the influence of excluded volume. An interpolation function extends the calculations to intermedia…
Article Effect of Calcining Temperature on Volatilization of Ruthenium in Batch Calcination of Simulated High-Level Liquid Waste was published on February 1, 1993 in the journal Radiochimica Acta (volume 60, issue 2-3).
Defects in lithium vanadate (Li3VO4) exposed to x rays were studied by electron spin resonance (ESR). 77 K irradiation produces two types of trapped-hole centers. One is supposed to be carbonate radical CO3−, which is thermally stable even at room temperature. Another, having a hyperfine interaction with a vanadium nu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPotassium complexes containing both crown ether and tertiary phosphine oxide ligandsVladimir V. Grushin, Corinne Bensimon, and Howard AlperCite this: Inorg. Chem. 1993, 32, 3, 345–346Publication Date (Print):February 1, 1993Publication History Published online1 May 2002Publi…
Two planktonic species of diatoms, Chaetoceros bacteriastroides and C. seychellarus , have been studied by light and electron microscopy. Important features that may be used as taxonomic characters are described. A new subgenus, Bacteriastroidea, is proposed to include C. bacteriastroides, because of its unique charac…
Six species of Caralluma have been found to occur in Oman: C. adenensis, C. “arabica”, C. flava, C. hexagona, C. penicillata and C. quadrangula, none being endemic to the country. The name C. aucheriana is considered obscure and its application should be discontinued. The application of the name C. arabica is uncertai…
Studies the effect of thread tension and the stitch length, L , as well as the fabric thickness, t , and its compressive modulus, E , on the seam balance and total thread consumption.
ADVERTISEMENT RETURN TO ISSUEArticleNEXTEffects of magnetic field on catalytic activity of carbon monoxide oxidation and oxygen adsorption over Ln0.7Sr0.3MnO3Peiyan Lin, Jian Peng, Bihui Hou, and Yilu FuCite this: J. Phys. Chem. 1993, 97, 8, 1471–1473Publication Date (Print):February 1, 1993Publication History Publish…
Abstract The scheelite-type structure of rubidium perrhenate, RbReO 4 , has been confirmed and refined from single-crystal X-ray data at two temperatures. The compound crystallizes tetragonally, space group I4 1 /a,with a = 5,8401(5), c = 13,265(2) Å at 297(1) K, and a = 5,8289(7), c = 13,109(2) Å at 159(3) K, respec…
Novel liquid crystals containing a siloxy chain as an end tail group instead of an alkyl chain were synthesized. The substitution effects were studied for ferroelectric liquid crystal materials. It was found that the temperature range for the chiral smectic C phase was reduced and shifted to lower temperature in compa…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTResonance Raman studies of nickel tetrathiolates and nickel-substituted rubredoxins and desulforedoxinYun Hua Huang, Isabel Moura, Jose J. G. Moura, Jean LeGall, Jae Bum Park, Michael W. W. Adams, and Michael K. JohnsonCite this: Inorg. Chem. 1993, 32, 4, 406–412Publication…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal analysis of peatKurt. Bergner and Christer. AlbanoCite this: Anal. Chem. 1993, 65, 3, 204–208Publication Date (Print):February 1, 1993Publication History Published online1 May 2002Published inissue 1 February 1993https://pubs.acs.org/doi/10.1021/ac00051a003https://do…
ABSTRACT The acidophilic diatom Asterionella ralfsii cf. var. americana Körn. was grown in continuous culture to examine the influences of both pH and Al on Si‐limited growth and uptake kinetics. In contrast to nutrient‐replete cultures of A. ralfsii, lowering pH from approximately 6 to 5 reduced algal cell density, c…
Raman spectra of the two-dimensional antiferromagnet MnPSe 3 are measured in the temperature region between 18 and 297 K. Below T N =74+or-2 K an anomalous enhancement of some Raman-active phonon peaks is observed. A new phonon peak appears below T N at 86 cm -1 . The relation between its behaviour and the magnetic or…
Electron paramagnetic resonance (EPR), electron-nuclear double resonance, optical absorption, and thermoluminescence have been used to investigate radiation-induced point defects in a single crystal of lithium triborate (LiB3O5). Two prominent defects are observed after irradiation near liquid-nitrogen temperature wit…