Materials Literature
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We present a quantitative analysis of ac electrical conductivity and dielectric constant measurements that were performed on boron carbide samples. This material is crystalline but disordered on the atomic scale because of the existence of a large stoichiometry range from B9C to B4C. The polaronic character of the hop…
We present a real-space renormalization-group method for calculating the exact local and average Green's functions for generalized Fibonacci lattices. The fundamental requirement of the present method is that one should be able to split the original lattice into a finite number of sublattices, all of which need not be…
In situ experiments have been carried out using a field emission scanning electron microscope (Hitachi S-800) in order to characterize the dynamic behavior of electromigration (EM) voids under high spatial resolution. These experiments have shown how the EM voids move against the electron wind either in passivated or…
Large single crystals (60×20×8 mm3) of a new nonlinear crystal thienylchalcone (T-17) were grown from acetone by the falling temperature method and the nonlinear optic properties were determined. The effective nonlinear optical coefficient, the angular acceptance (Δθ,Δφ), and the walk-off angle were 7.1 pm/V, 0.053° c…
Results of x-ray measurements on the various columnar mesophases of multi-ethers of the naturally occurring stereoisomers myo- and scyllo-inositol are presented. Depending on the number of alkyl substituents at their inositol cores such derivatives show interesting kinds of molecular organization in their liquid-cryst…
Deformation and breakup of immiscible fluids in deterministic chaotic flows is governed by self-similar distributions of stretching histories and stretching rates and produces populations of droplets of widely distributed sizes. Scaling reveals that distributions of drop sizes collapse into two self-similar families;…
Abstract Infrared (IR) microscopic analysis was performed in tandem with traditional techniques of fiber analysis in case studies in order to determine the feasibility of IR microscopy as a routine technique for fiber analysis. All fibers which were comparable by visual, optical microscopy were also found to be compar…
In order to protect metallic structures from marine corrosion, cathodic protection using sacrificial anodes or impressed current is widely used. In aerated seawater steel is considered to be protected when a cathodic potential of — 800 mV/SCE (Saturated Calomel Electrode) is applied. However, in many cases, this poten…
We have measured in situ M\"ossbauer spectra of iron hydride made in a diamond anvil cell at high pressure and room temperature. The spectra show a sudden change at 3.5\ifmmode\pm\else\textpm\fi{}0.5 GPa from a single hyperfine pattern to a superposition of three. The former pattern results from normal \ensuremath{\al…
A method of measuring all the complex permeability tensor components of microwave ferrites using a single cylindrical ferrite sample is described. Two dielectric ring resonators having the same height and internal diameter but different external diameters, operating on HE/sub 111//sup +or-/ and H/sub 011/ modes respec…
An analysis is presented of the angular distribution of reflections in Laue diffraction, with particular application to the spatial overlap problem in synchrotron macromolecular crystallography. Spatial overlaps of spots on the detector occur when the angular separations of adjacent diffracted beams are very small. Th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDirect electrochemical synthesis of X2InCH2X compounds (X = Br, I) and a study of their coordination chemistryTheodore A. Annan, Dennis G. Tuck, Masood A. Khan, and Clovis PeppeCite this: Organometallics 1991, 10, 7, 2159–2166Publication Date (Print):July 1, 1991Publication…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAb initio molecular orbital calculations on the electronic structure of sodium silicate glassesTakashi Uchino, Matae Iwasaki, Tetsuo Sakka, and Yukio OgataCite this: J. Phys. Chem. 1991, 95, 14, 5455–5462Publication Date (Print):July 1, 1991Publication History Published onli…
Fourier transform infrared (FTIR) transmission spectroscopy was used to monitor the decomposition of NH3 and ND3 on silicon surfaces. Experiments were performed in situ in an ultrahigh vacuum (UHV) chamber using high surface area porous silicon samples. The FTIR spectra revealed that NH3 (ND3) dissociatively adsorbs a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA high-valent oxomanganese dimer containing bridging and terminal inorganic phosphate ligandsJoseph E. Sarneski, Mary Didiuk, H. Holden Thorp, Robert H. Crabtree, Gary W. Brudvig, J. W. Faller, and Gayle K. SchulteCite this: Inorg. Chem. 1991, 30, 14, 2833–2835Publication Da…
To evaluate potential catalytic mechanism for thioltransferase thiol-disulfide exchange reactions, seven pig liver mutants were constructed by site-directed mutagenesis. All the expressed enzymes, including wild-type and mutants with the exception of the inactive mutant, ETT-C22S, were variably inhibited by iodoacetam…
Abstract A systematic investigation of the dynamic mechanical properties of high‐density polyethylene (HDPE)/high‐impact polystyrene (HIPS)/copolymer blends was carried out. Blends of 80/20 weight percent of HDPE/HIPS were prepared in the melt state at 180°C in a batch mixer. Synthesized pure diblock (H77) and tapered…
Electrochromic nickel oxide films were deposited by radio-frequency magnetron sputtering of a Ni target in gas mixtures of Ar and O2. When electrochemically cycled in 0.1 N KOH solution, large reversible changes in visible absorption were obtained within the first 10 bleach/color cycles. Films which showed the greates…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystallization kinetics in the mixtures of poly(vinylidene fluoride) and poly(methyl methacrylate): two-step diffusion mechanismHiromu Saito, Tetsuo Okada, Toshihiko Hamane, and Takashi InoueCite this: Macromolecules 1991, 24, 15, 4446–4449Publication Date (Print):July 1, 1…
Ribbons were annealed in the demagnetized state with one wall along the ribbon middle. This wall becomes pinned during the heat treatment. Reentrant reversal occurs when reverse domains are nucleated at the ribbon edge with a threshold field larger than the demagnetizing field; this wall does not annihilate when it me…