Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
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…
The effect of β-heat treatment on microstructure and nodular corrosion of Zircaloy-4 were investigated for the specimens which were β-heat treated and then cooled in various cooling process, such as, iced brine, water, oil, air, and furnace cooling. It was observed that the martensitic structure with substructures of…
Abstract The crystal structures of the monoclinic dimorphs of natural britholite-(Ce) and britholite-(Y) have been solved in space group P 2 1 using both annealed and unannealed samples. Like the P 6 3 britholite atomic arrangement reported recently, the structure of monoclinic britholite is similar to the apatite ato…
Proteoliposomes reconstituted with purified oxaloacetate decarboxylase of Klebsiella pneumoniae catalyzed the uptake of Na+ ions upon oxaloacetate decarboxylation. The degree of coupling between the chemical and the vectorial reaction is dependent on the reconstitution conditions, and with the best preparations approa…
The electrochemical properties of solutions of niobium chlorides in the fused eutectic were studied by transient electrochemical techniques. The fundamental role of temperature was determined. At temperatures ranging from 380–600°C, two reversible redox reactions were detected : , and . Reduction of Nb(III) led to met…
The tribological behavior of a SiC–TiB 2 ceramic‐matrix composite was evaluated using a pin‐on‐flat contact configuration in reciprocating sliding. A steady‐state friction coefficient of about 0.55 and an average specific wear rate of about 2 × 10 ‐6 mm 3 ·N ‐1 ·m ‐1 were measured. The mechanisms of material removal i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMiscibility and cocrystallization in homopolymer-segmented block copolymer blendsK. P. Gallagher, X. Zhang, J. P. Runt, G. Huynh-Ba, and J. S. LinCite this: Macromolecules 1993, 26, 4, 588–596Publication Date (Print):February 1, 1993Publication History Published online1 May…
The width of the argon 2s level was experimentally obtained from x-ray emission-spectroscopy (2.25\ifmmode\pm\else\textpm\fi{}0.15 eV) and x-ray photoelectron-spectroscopy (XPS) (2.25\ifmmode\pm\else\textpm\fi{}0.05 eV) measurements. A theoretical value of 1.85 eV was obtained by a Green's-function calculation. A high…
Abstract In groups of isotypic ionic crystals the product of the mean value of the principal elastic constants and of the molecular volume, the S -value, is an almost constant quantity. Even chemically related ionic compounds possess similar S -values. The different “hardness” of the ions and the number of contacts of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMicelles series. 31. Building blocks for cascade polymers. 11. Synthesis of functionalized cascade cores: tetrakis(.omega.-bromoalkyl)methanesGeorge R. Newkome, Sadao Arai, Frank R. Fronczek, Charles N. Moorefield, Xiaofeng Lin, and Claus D. WeisCite this: J. Org. Chem. 1993…
Abstract Illite from the Potsdam Sandstone (lower Ordovician) of Northwestern New York was studied by powder X-ray diffraction, scanning electron microscopy, and chemically analyzed and dated by the K/Ar method. The texture and ages of 360 and 392 Ma on two samples establish that the mineral is authigenic and relative…
ADVERTISEMENT RETURN TO ISSUEPREVArticleSynthesis and structure of chromium antimony triselenide (CrSbSe3): a pseudo-one-dimensional ferromagnetDebra A. Odink, Veronique Carteaux, Christophe Payen, and Guy OuvrardCite this: Chem. Mater. 1993, 5, 2, 237–240Publication Date (Print):February 1, 1993Publication History Pu…
Stoichiometric mullite, 3Al 2 O 3 ·2SiO 2 , has been prepared from a variety of colloidal and solution precursors. In order to change the level of mixing, the size of the silica particles has been varied while keeping the alumina (boehmite) particle size constant. The effect of varying particle size on the crystalliza…