Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCarbon filament growth on platinum catalystsW. T. Owens, N. M. Rodriguez, and R. T. K. BakerCite this: J. Phys. Chem. 1992, 96, 12, 5048–5053Publication Date (Print):June 1, 1992Publication History Published online1 May 2002Published inissue 1 June 1992https://pubs.acs.org/d…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfrared spectra and structure of acetylene on sodium chloride (100)S. Keith Dunn and George E. EwingCite this: J. Phys. Chem. 1992, 96, 13, 5284–5290Publication Date (Print):June 1, 1992Publication History Published online1 May 2002Published inissue 1 June 1992https://doi.o…
Flagstaff, AZ 86011 ABSTRACT-Seventy-eight taxa of diatoms were identified from the epiphytic community of Cla- dophoraglomerata in the Colorado River through Glen and Grand Canyons. Achnanthes affinis, Cocconeis pediculus, Diatoma vulgare, and Rhoicosphenia curvata made up 80% of the diatom epiphyton community within…
To date, CaVO 3- y has been reported and believed to be one of the typical metallic oxides. From our detailed study, however, it has been found that this system shows insulating properties with stoichiometric oxygen content. This insulator phase was obtained by oxidation of as-cast single crystals. The magnetic suscep…
The long quest for a VV triple bond has finally met with success, as shown by the synthesis of the title compound 1. A short intermetallic distance and high magnetic anisotropy indicate strong interaction between the vanadium centers. R = p-CH3C6H4.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSymmetrical and unsymmetrical quadruply aza bridged closely interspaced cofacial bis(5,10,15,20-tetraphenylporphyrins). 3. Interplanar distances, proton NMR chemical shifts, and the catalysis of the electrochemical reduction of oxygenRafik Karaman, Seungwon Jeon, Orn Almarss…
Vibrational assignments for α-syndiotactic polystyrene are made with the use of parallel and perpendicular polarization of uniaxially oriented film, and by comparison of vibrational data and assignments for toluene and atactic and isotactic polystyrene. Vibrational assignments are given for a cast film of β-syndiotact…
A spin-polarized electron gun for electron spectroscopies is described in detail. The gun consists of an electron source based on a negative electron affinity GaAs photocathode coupled to an appropriate transport electron optics. The gun has been designed with the aid of ray-tracing analysis and then accurately tested…
EXAFS measurements were performed on four sulfided catalysts with the same compn. as their 57Co-contg. counterparts which were previously characterized by Moessbauer emission spectroscopy. The Co species in Co/C catalysts with a Co-Mo-S-like Moessbauer emission spectrum after sulfidation at 373 K is similar to the spe…
The kinetics of the end crosslinking process in linear-polymer melts is studied using molecular-dynamics simulations. Starting from an equilibrated melt, tetrafunctional crosslinkers are attached randomly to a fraction x of the chain ends. The system is then allowed to evolve. When a free end comes within a short reac…
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…