Materials Literature
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Spectroscopic data are presented for a series of synthetic anorthite samples crystallized from a glass of the same composition and annealed at 1400°C for times of 1mn to 179h. The NMR spectra resemble those of natural Al,Si ordered An-rich feldspars but contain peaks at more negative chemical shifts, indicating the pr…
Residence time-dependent changes in fibrinogen after adsorption to six different polyurethanes were examined by measuring polyclonal antifibrinogen binding to the adsorbed protein. The amount of adsorbed fibrinogen that could be eluted by sodium dodecyl sulfate (SDS) was also measured. Baboon fibrinogen was first adso…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffects of polycarbonate molecular structure on the miscibility with other polymersC. K. Kim and D. R. PaulCite this: Macromolecules 1992, 25, 12, 3097–3105Publication Date (Print):June 1, 1992Publication History Published online1 May 2002Published inissue 1 June 1992https:/…
Perovskite potassium tantalate niobate (KTN) powders and thin films were synthesized from a metal alkoxide solution. Homogeneous KTN coating solutions were prepared from KOC 2 H 5 , Ta(OC 2 H 5 ) 5 , and Nb(OC 2 H 5 ) 5 in absolute ethanol. The precursor crystallized to pyrochlore at ∼ 650°C, and then to perovskite at…
Cu-Mn single crystals oriented for multiple slip with [111] and [100] axis have been deformed in tension at room temperature. The Mn content was 0.8 at.% for the [111] and 3at.% for the [100] crystals. The observed decrease in the workhardening rate with increasing reduced shear stress τ—τ0 coincides with the linear d…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCarbon-13 NMR spectroscopic determination of the magnitude of the .beta.-silyl stabilization effect in 1-mesitylvinyl cationsHans Ullrich Siehl and Frank Peter KaufmannCite this: J. Am. Chem. Soc. 1992, 114, 12, 4937–4939Publication Date (Print):June 1, 1992Publication Histo…
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…