Materials Literature
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We present a detailed experimental and numerical investigation of the directional-solidification growth patterns in thin films of the ${\mathrm{CBr}}_{4}$--8 mol % ${\mathrm{C}}_{2}$${\mathrm{Cl}}_{6}$ alloy, as a function of the orientation of the (fcc) crystal with respect to the solidification setup. Most experimen…
Variations in the nonreactive P content of lake sediments as a consequence of changing redox conditions suggest that microorganisms may contribute to uptake and release of P. In this study, 31–50% of the nonreactive P was identified as polyphosphate (poly‐P) in NaOH extracts of sediments from eutrophic Lake Baldegg an…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCleavage of the Nitrous Oxide NN Bond by a Tris(amido)molybdenum(III) ComplexCatalina E. Laplaza, Aaron L. Odom, William M. Davis, Christopher C. Cummins, and John D. ProtasiewiczCite this: J. Am. Chem. Soc. 1995, 117, 17, 4999–5000Publication Date (Print):May 1, 1995Publica…
Multidimensional, multinuclear nuclear magnetic resonance spectroscopy combined with dynamical simulated annealing has been used to determine the structure of a 110 amino acid cellulose-binding domain (CBD) from Cex, a beta-1,4-glycanase from the bacterium Cellulomonas fimi (CBDcex). An experimental data set comprisin…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure Development in Semicrystalline Diblock Copolymers Crystallizing from the Ordered MeltA. J. Ryan, I. W. Hamley, W. Bras, and F. S. BatesCite this: Macromolecules 1995, 28, 11, 3860–3868Publication Date (Print):May 1, 1995Publication History Published online1 May 200…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTwo Interpenetrating 3D Networks Which Generate Spacious Sealed-Off Compartments Enclosing of the Order of 20 Solvent Molecules in the Structures of Zn(CN)(NO3)(tpt)2/3.cntdot.solv (tpt = 2,4,6-tri(4-pyridyl)-1,3,5-triazine, solv = .apprx.3/4C2H2Cl4.cntdot.3/4CH3OH or .apprx…
A 5.0-kbp genomic EcoRI restriction fragment which complemented a third subclass of polyhydroxyalkanoic acid (PHA)-leaky mutants of A. eutrophus that accumulated PHA at a lower rate than the wild type was cloned from Alcaligenes eutrophus H16. A 687-bp phaPAe gene on this fragment encoded a 24-kDa protein (M(r) = 23,9…
Inelastic neutron scattering and transmission electron microscopy have been used to study a single crystal of the ${\mathrm{Ni}}_{2}$ MnGa shape-memory ferromagnetic Heusler alloy in a wide temperature range above the martensitic phase transformation at ${\mathit{T}}_{\mathit{M}}$=220 K. Significant, though incomplete…
The unifying notion of material force which gathers under one vision all types of driving “forces” on defects and smooth or abrupt inhomogeneities in fracture, defect mechanics, elastodynamics (localized solutions) and allied theories such as in electroelasticity, magnetoelasticity, and the propagation of phase transi…
The method that we have developed [ P-P. Borsboom , Ph.D. dissertation ( Delft University of Technology, Delft, The Netherlands); P-P. Borsboom H. J. Frankena , J. Opt. Soc. Am. A12, 1134– 1141 ( 1995)] is successfully applied to a two-dimensional focusing grating coupler. The field in the focal region has been determ…
A method to determine the field scattered by a two-dimensional rectangular grating of finite length is developed. Both periodic or aperiodic and lossy or lossless structures can be treated. The grating is built up as a finite sequence of two alternating types of waveguide sections connected by means of step discontinu…
Phytoplankton collected bimonthly by net during 1991–2 from the Sontecomapan lagoon (12 km long and 1·5 km wide), in the Gulf of Mexico, included four species and several forms of the diatom genus Skeletonema. The spatial and temporal distribution of Skeletonema subsalsum, S. pseudocostatum and S. costatum in the lago…
Ageing of solid insulating materials and systems, according to IEC and IEEE standards, is the occurrence of irreversible deleterious changes that critically affect performance and shorten useful life. What causes ageing is not an easy question to answer, nor is it a function of an isolated event or applied stress. Yea…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAtomic-Scale Restructuring in High-Pressure CatalysisJon Wilson and Cor de GrootCite this: J. Phys. Chem. 1995, 99, 20, 7860–7866Publication Date (Print):May 1, 1995Publication History Published online1 May 2002Published inissue 1 May 1995https://pubs.acs.org/doi/10.1021/j10…
We have developed a novel method to synthesize ‘‘clean’’ carbon nanotubes with relatively higher yield using a hydrogen arc discharge. The quality and yield of the tubes depend sensitively on the gas pressure in the arc discharge. We have observed sharp, open-ended nanotubes with clear lattice fringes at the edges and…
Ab initio calculations based on the density-functional pseudopotential approach have been used to study the fully relaxed structure, the electron distribution and the electronic density of states of (001) terraces, steps, corners and reverse corners, and of F-centers at these surface features on MgO. The calculations…
A computationally efficient implementation of rigorous coupled-wave analysis is presented. The eigenvalue problem for a one-dimensional grating in a conical mounting is reduced to two eigenvalue problems in the corresponding nonconical mounting. This reduction yields two n × n matrices to solve for eigenvalues and eig…
The validity of form-factor, modified-form-factor and anomalous-scattering-factor approximations in predictions of elastic photon-atom scattering is assessed with the aid of the state-of-the-art numerical calculation of Rayleigh scattering obtained using the second-order S-matrix theory, in the photon energy range fro…
Abstract A novel patented process and several reactors have been developed for devulcanization of waste rubbers. The technology is based on the use of the high power ultrasonics. The ultrasonic waves of certain levels in the presence of pressure and heat rapidly break up the three-dimensional network in crosslinked ru…
In the study of the high‐temperature behavior of ceramic hydroxyapatite (HAp), it was found in relation to its ionic conduction properties that HAp underwent partial dehydration of its lattice hydroxide ions. Considering that HAp ceramics are sintered above 1200°C without destruction of the apatitic structure, the deh…