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。
Abstract The reduction of NO with propane in the presence of excess oxygen was investigated using gallium ion-exchanged zeolite catalysts, among which ferrierite(Ga-ferrierite) and ZSM-5(Ga-ZSM-5) showed high activity in a wide range of reaction temperature.
Dielectric studies of a thermotropic-liquid-crystalline substance [pentylcyanobiphenyl (5CB)] under high pressure are reported. Measurements of a complex dielectric permittivity were carried out in the pressure range 0.1--160 MPa, the frequency range 1 kHz--13 MHz, and the temperature range 287--343 K. Static permitti…
Parallel and perpendicular-polarized Raman, MAS and static 31 P NMR spectra were collected to investigate phosphate speciation in potassium aluminosilicate glasses. Phosphate speciation is critically dependent on the K/(K+Al)(K * ) ratio.
The microstructure of thin films of nearly symmetric poly(ethylene–propylene)–poly(ethylethylene) (PEP-PEE) diblock copolymers (f=0.55, where f is the volume fraction of PEP) was characterized by neutron reflectometry (NR). A symmetric film structure in which the PEE block segregates preferentially to both interfaces…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSuperexchange metal-metal coupling in dinuclear pentaammineruthenium complexes incorporating a 1,4-dicyanamidobenzene dianion bridging ligandM. A. S. Aquino, F. L. Lee, E. J. Gabe, C. Bensimon, J. E. Greedan, and R. J. CrutchleyCite this: J. Am. Chem. Soc. 1992, 114, 13, 513…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCompounds containing linked multiply-bonded dimetal units. 2. An antiferromagnetic compound containing infinite chains of Ru2(O2CR)4+ units linked by bridging phenazine moleculesF. Albert Cotton, Youngmee Kim, and Tong RenCite this: Inorg. Chem. 1992, 31, 13, 2723–2726Public…
Empirical comparison of species concepts can be made by taking advantage of a common operational exigency: the use of phenotypically irreducible clusters of individuals as first order estimates of species. A phylogenetic analysis of diatoms was undertaken using such clusters as terminal taxa. Cladistic analysis and bi…
The behavior of the impurities iron, cobalt, yttrium, and cerium is determined via radiotracer techniques for the preparation of high‐purity lanthanum fluoride. The behavior of nickel and copper during the coprecipitation of a lanthanum nitrate solution is determined by graphite furnace atomic absorption spectrometric…
Abstract A blue-green scaly coating on a slaty specimen from the Bastenberg mine, near Ramsbeck, Germany, yielded an X-ray powder pattern akin to schulenbergite. Chemically it is the zinc analogue of schulenbergite. Electron-probe data, XRF and ICP/OES analyses are presented which demonstrate two distinct zinc-rich co…
Abstract Copper-exchanged zeolites catalyzed the oxidative decomposition of (CH3)3N to N2, CO2, and H2O. The selectivity to N2 was 92% and the formation of NOx was less than 5 ppm, when 8000 ppm of (CH3)3N with O2 (20%) was flowed over copper-exchanged Y zeolite at 573 K.
The classical criterion for cavitation of bubbles is based on the assumption that the bubbles are subjected to a quasi-steady pressure change and that the non condensible gas within the cavity behaves isothermally. No simple criterion accounting for the dynamic terms in the Rayleigh-Plesset equation is presently avail…
Abstract X‐ray photoelectron and x‐ray‐induced Auger spectroscopic analyses of various copper‐containing catalysts have been used to reveal the chemical state of copper during on‐stream in the dehydrogenation of methanol to methyl formate. Three catalyst systems have been selected for this purpose: (1) supported prepa…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAre ring polymers adsorbed on a surface more than linear polymers?G. Stratouras and M. KosmasCite this: Macromolecules 1992, 25, 12, 3307–3308Publication Date (Print):June 1, 1992Publication History Published online1 May 2002Published inissue 1 June 1992https://pubs.acs.org/…
Abstract For a number of chiral α,β‐unsaturated carbonyl compounds, cyclohexanone and cyclohexenone derivatives, existing essentially in the form of single molecular conformation, the correlation dependences were established between the values of the calculated dissymmetry functions (DF) with respect to atomic masses…
Abstract Annealing poly(ether ether ketone ketone) (PEEKK) between glass transition and melting temperature generally results in a pronounced double peak melting behavior as obtained by DSC. Detailed investigations of the dependence of this double peak melting behavior on annealing conditions and experimental paramete…
The aging of impregnated polypropylene (PP) film has been carried out on capacitor models at 80 degrees C under 50 Hz AC electrical stress (137 V/sub rms// mu m). The damage was estimated from the local measurement of the breakdown voltage of the PP film. The effects of impurities (electrolyte, water, oxygen) added to…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCatalytic and stereoselective activities of manganese achiral and chiral porphyrins in dioxygenation of tryptophan derivativesKatsutoshi Ohkubo, Takashi Sagawa, and Hitoshi IshidaCite this: Inorg. Chem. 1992, 31, 13, 2682–2688Publication Date (Print):June 1, 1992Publication…
The density of Ga 2 O 3 liquid in equilibrium with air has been measured at 1800 0 to 1900 0 C using an Ir double‐bob Archimedean method. The data yield the following description of the density of Ga 2 O 3 liquid: ρ= 4.8374(84)–0.00065(12)(T −1850 0 C). This density‐temperature relationship is compared with the partia…
XPS indicates that the organometallic compd. [PtI[C6H3(CH2NMe2)2-2,6](h1-I2)], (I), representing an end-on coordinated dihalogen intermediate in the oxidative addn. reaction of dihalogen to d8 metal centers, contains platinum in a divalent oxidn. state. The use of a monochromatized x-ray source, short measurement time…
Research studies which provide insight into the response of human skin to fabric when contacted by and/or covered with fabric are reviewed When possible, the fabric parameter thought influential in eliciting a certain response (e.g., increase in capillary blood flow, hydration state) is given. The operating principles…