Materials Literature
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Three-dimensional numerical simulations are performed of freckling during directional solidification of a binary metal alloy. The purpose of the study is to evaluate the sensitivity of the predictions to the grid resolution. Detailed results are provided for the liquid concentration, solid fraction, and liquid velocit…
The discharge plasma-chemical hybrid process for NO/sub x/ removal from the flue gas emissions is an extremely effective and economical approach in comparison with the conventional selective catalytic reduction system. In this paper we bring out a relative comparison of several discharge plasma reactors from the point…
Dihydroxyacetone kinases are a sequence-conserved family of enzymes, which utilize two different phosphoryldonors, ATP in animals, plants and some bacteria, and a multiphosphoprotein of the phosphoenolpyruvate carbohydrate phosphotransferase system in bacteria. Here we report the 2.5-A crystal structure of the homodim…
Compositional data and Fe 3+ /ΣFe ratios obtained by electron microprobe and Mössbauer analyses are given for a suite of three amphibole and amphibole-asbestos samples collected from the former vermiculite mine near Libby, Montana. A crystal structure analysis, compositional data, and Fe 3+ /ΣFe values for two samples…
Pure BN coatings have been synthesized on the surface of SiC powders and fibers by a novel carbothermal nitridation method. Three stages are involved in the process: first, formation of a carbon layer on the SiC by the extraction of Si with chlorine; second, infiltration of the resulting nanoporous carbide‐derived car…
Batch sorption and column breakthrough studies were conducted to investigate the potential of layered double hydroxides (LDHs) to remove bacteriophage MS2 from contaminated waters. All four of the LDHs evaluated in this study had very high retention capacities for MS2. Sorption results showed that MS2 could be complet…
We have produced an anisotropic Nd/sub 15.5/Dy/sub 1.0/Fe/sub 72.7/Co/sub 3.0/B/sub 6.8/Al/sub 1.0/ magnet by the spark plasma sintering (SPS) technique and compared it with a magnet of the same composition processed by the conventional sintering method. We investigated magnetic properties, microstructure, and constit…
A general model concerning the role of the electrode potential on the charge-transfer enhancement mechanism of SERS is proposed, justifying the existence of a parameter β which reduces the effectiveness of the electrode potential in order to shift the excited charge-transfer level. This explains the observed deviation…
Films deposited by evaporation at glancing angles form structures dependent on the speed of substrate rotation. If the substrate is held stationary, oblique columns are grown. For slow substrate rotation, helices are formed while faster rotation yields pillars. Silicon and silicon dioxide films grown under similar con…
Abstract A dinuclear peroxotungstate, K 2 [{W(O)(O 2 ) 2 (H 2 O)} 2 (μ‐O)]⋅2 H 2 O, exhibits high catalytic performance for the epoxidation of various allylic alcohols with only one equivalent of hydrogen peroxide at 305 K in water solvent. The effectiveness of this system is evidenced by high chemo‐, regio‐, and dia…
The Al 2 O 3 addition to stabilized ZrO 2 has been studied for more than 20 years. In this article, literature and new results on the positive and negative effects of Al 2 O 3 additions on the electrical properties of ZrO 2 are summarized and analyzed. In particular, a comprehensive grain‐boundary conduction model is…
Extracellular, high-molecular-weight glycoconjugates were extracted from cleaned frustules of Craspedostauros australis with 8 M urea in 50% formic acid (UFE) or with 2 M guanidine-HCl (GU). The weight ratio of protein : carbohydrate : sulphate : phosphate was 42 : 8 : 3 : 1 in the GU extract. The three dominant molec…
Abstract Highly selective telomerization reactions of a number of short‐chain glycol nucleophiles with 1,3‐butadiene have been achieved in aqueous biphasic systems employing the water‐soluble catalyst system Pd(acac) 2 /TPPTS. For all substrates the selectivity for the obtained monotelomers 5 – 7 reached ≥95% whereas…
New synthetic routes to 1,2,3-dithiazolo-1,2,3-dithiazolylium salts, based on double Herz condensations of N-alkylated 2,6-diaminopyridinium salts with sulfur monochloride, have been developed. The two prototypal 1,2,3-dithiazolo-1,2,3-dithiazolyl radicals HBPMe and HBPEt have been prepared and characterized in soluti…
We found that the lateral growth of a carbon nanopillar with electron beam-induced chemical vapor deposition (EB-CVD) was mainly dominated by forward scattering of the electron beam. The minimum diameter of the carbon nanopillar was reduced to 5 nm. In contrast, vertical growth with EB-CVD produced thicker pillars ∼50…
We studied the fabrication of free-designed three-dimensional (3D) structures by using focused-ion-beam chemical-vapor deposition. The 3D structures are fabricated by scanning 30 keV Ga+ ion-beam-assisted deposition in a 1×10−4 Pa phenanthrene atmosphere. The scanning pattern and blanking signal of the ion beam are ge…
Recombinant sericin proteins of different molecular masses (17.4, 31.9, and 46.5 kDa), based on the 38-amino acid repetitive motif of native sericin, were cloned, expressed, and purified. The recombinant sericin self-assembled during dialysis (starting concentration of 2.5 mg/ml) forming twisted fibers. Circular dichr…
Abstract Three grades of bisphenol‐A polycarbonate—high molecular weight linear, high molecular weight branched and low molecular weight linear—and their blends have been studied by GPC, DMTA, DSC, rheometry and impact measurements. The molecular weight distribution of the blends agred with that predicted from the com…
The kinetic energy distribution of oxygen atoms resulting from electron impact dissociation of O 2 has been measured. A high‐resolution vacuum ultraviolet spectrometer was employed for the measurement of the OI(115.2 nm, 130.4 nm, 135.6 nm) fine‐structure emission line profiles at 35 eV and 100 eV electron impact ener…
This study presents a simulation model for the microcellular injection molding process in which supercritical fluid such as carbon dioxide or nitrogen is mixed with molten polymer and injected into the mold. Our model simulates the development of cells in the melt during injection molding. The effects of cell growth o…