Materials Literature
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The mixed cation effect in glasses affects transport properties such as diffusion and ionic conductivity. The temperature dependence of 7Li and 23Na NMR spin-lattice relaxation times, T1, have been measured in a series of trisilicate (Na2Si3O7, NaRbSi3O7, NaCsSi3O7 and NaCa0.5Si3O7) and disilicate (Li2Si2O5, LiKSi2O5…
Polyhydroxyalkanoate (PHA) accumulation and the morphology of PHA inclusion bodies were examined in Bacillus megaterium, strain 11561. Our results show a pattern of PHA degradation and synthesis, and of inclusion body growth and proliferation not previously reported. Degradation of PHA in the lag phase was followed by…
Molecular dynamics simulations and a systematic analysis of the local atomic structure have been done to investigate the microstructure of liquid and amorphous Ni. The n-body Gupta potential, based on the second moment approximation of a tight-binding Hamiltonian, was used to model the metallic bonding of the system.…
Scanning tunneling microscopy (STM) was used to study the oxidation of CO with O-precovered Cu(110) in the steady state at 400 K at the atomic level. There is a strong preference for CO to react with oxygen along the p(2 × 1) oxygen rows. The reaction appears to occur initially at the outer edge of an oxygen island, c…
Crosslinked polyethylene (XLPE) and low-density polyethylene (LDPE) insulations used in HV cables are not only subjected to electrical and thermal stresses, but also exposed to mechanical stresses, whether residual internal stresses created during the cooling process of the fabrication, external forces when cables are…
The chemistry of the MoOREO32− sysems (E = P, As is remarkably diverse, exhibiting influences of the Mo oxidation state, solvent, organic substituents and reaction conditions of temperature, pressure and stoichiometry. Clusters exhibiting molybdenum nuclearities of two, four, five and six are common, as are species…
Oxidation and steam reforming of on Ni/YSZ and Fe/YSZ cermet anodes were examined, primarily under the condition of . In the fuel system, steam reforming occurs on anodes, generating CO and . The steam reforming activity of on Ni/YSZ was much higher than on Fe/YSZ at open circuit. The anodic polarization curves of an…
Thin semiconducting barium titanate ceramic bars consisting of single grains joined together in series have been prepared, and the positive temperature coefficient of resistivity (PTCR) characteristics of strictly single‐grain boundaries in the materials were investigated. The resistivity ( R )‐temperature ( T ) chara…
Abstract Regenerated cellulose fibers spun from straw pulp using the N‐methylmorpholine N‐oxide (NMMO) process were evaluated as a reinforcement for low‐density polyethylene (LDPE). Surface fibrillation was carried out by a mechanical treatment to improve interfacial adhesion. Surface fibrillation resulted in a gradua…
Strong pulsed electron emission has been observed from 12/65/35 lead lanthanum zirconate titanate ceramic composition in two different nonswitched phases at room temperature and at the temperature 100 °C. The electron emission parameters of this composition appear to be independent of phase for the two phases investig…
Abstract In‐situ FTIR studies on the conformational changes of poly(ethylene terephthalate) (PET) films with different thermal histories, i. e., quenched from the melt and sub‐ T g annealed at different temperatures, were carried out while increasing the temperature through the glass transition region. The temperature…
We present a theoretical approach for studying the deformation of grafted polymer layers in strong shear flows that calculates the deformation of grafted chains and the solvent flow profile within the layer in a mutually consistent fashion. We illustrate this approach by considering the deformation of Alexander-de Gen…
Experiments were performed on the motion of isolated drops and bubbles in a Dow-Corning silicone oil under the action of an applied temperature gradient in a reduced gravity environment aboard the NASA Space Shuttle in orbit. Images of the interior of the test cell during these experiments were recorded on cine film a…
A systematic study of the effects of poling time and applied voltage on second-harmonic (SH) generation in thermally poled silica glass reveals that the SH signal is proportional to the square of the applied voltage and that the speed of the poling process increases with the applied voltage. Prior treatment of the sam…
Abstract TEM characterization of stacking relations in I/S of expanded shale samples from the Gulf Coast and Michigan Basin was carried out to address the issues of the degree of coherency and the nature of layer stacking sequences in smectite, I/S and illite. The two-dimensional lattice fringe images obtained from th…
Abstract The weathering of chlorite, one of the major minerals of the host rock in the uranium ore deposit at Koongarra, Australia, was examined by X-ray diffraction (XRD) analysis, scanning electron microscopy (SEM), electron microprobe analysis, and transmission electron microscopy (TEM). The conversion sequence of…
The energy density crystallization threshold of amorphous GeSb films has been studied for the first time as a function of the laser pulse duration in the range from 170 fs to 8 ns. The results obtained provide evidence of the existence of enhanced crystallization upon irradiation with pulses shorter than 800 fs, which…
Theoretical and practical information on galvanic corrosion of zinc and its alloys, coupled to other metals, particularly steel, is organized and presented, along with a conceptual and elemental analysis of galvanic coupling between zinc and steel. Various factors which may play roles in galvanic action between zinc a…
An NAD(P)-glucose dehydrogenase from the extremely halophilic Archaeon, Haloferax mediterranei, has been purified to electrophoretic homogeneity. The purified enzyme has been characterised with respect to its cofactor specificity, subunit composition and its salt and thermal stability. The N-terminal amino acid sequen…
Abstract Toluene‐ d 8 solutions of methylaluminoxane (MAO) after the addition of different amounts of trimethylaluminium (TMA) have been studied by means of 1 H and 13 C NMR at a temperature as low as −78°C to freeze out some of the fluxional equilibria of the molecule. A comparison of the half height width of the NMR…