Materials Literature
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An experimental study of pattern recognition of partial discharge (PD) in a crosslinked polyethylene (XLPE) cable by using a neural network (NN) system is described. The NN system was a three-layer artificial neural network system with feedforward connections, and its learning method was a backpropagation algorithm in…
We have carried out molecular-dynamics simulation of liquid Si using the tight-binding Hamiltonian proposed by Goodwin, Skinner and Pettifor. The simulation results on the structural and dynamical properties (radial and angular distribution functions, the electronic density-of-states, and the diffusion constant) are p…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConvergent synthesis of siloxane starburst dendrons and dendrimers via hydrosilylationAtsushi Morikawa, Masaaki Kakimoto, and Yoshio ImaiCite this: Macromolecules 1992, 25, 12, 3247–3253Publication Date (Print):June 1, 1992Publication History Published online1 May 2002Publis…
Several aromatic β-diketones with a different number of alkyloxy groups in the aromatic rings and their derived pyrazoles, isoxazoles and thallium (I) complexes have been synthesized. The potential mesomorphic properties of these compounds have been investigated by optical microscopy, DSC and X-ray diffraction. The py…
The molecular basis of thermal stability of globular proteins is a highly significant yet unsolved problem. The most promising approach to its solution is the investigation of the structure-function relationship of homologous enzymes from mesophilic and thermophilic sources. In this context, D-glyceraldehyde-3-phospha…
Experimental evidence is presented that small (19- to 34-atom) clusters of iron, cobalt, and nickel tend to adopt polyicosahedral structure when saturated with ammonia. Clusters in the polyicosahedral series (having 19, 23, 26, 29, 32, and 34 atoms) often saturate with 12 NH3 molecules, the expected number for polyico…
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…