Materials Literature
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Other| December 01, 1996 The coordination numbers of Na and K atoms in low albite and microcline as determined from a procrystal electron-density distribution Robert T. Downs; Robert T. Downs Carnegie Institution of Washington, Geophysical Laboratory, Washington, DC, United States Search for other works by this author…
Abstract Soluble poly(2,5‐dialkoxy‐1,4‐phenylenevinylene) has been prepared via Stille coupling reaction between 2,5‐dialkoxy‐1,4‐diiodobenzene and E ‐1,2‐bis(tributylstannyl)‐ethene in the presence of palladium complexes. Characterization of this material by means of 1 H and 13 C nuclear magnetic resonance (NMR), ult…
Summary This paper discusses the effects of different horizons and soil solution compositions on dissolved organic matter retention in a moorland podzol and compares the results with previous studies of forest podzols. Adsorption isotherms were constructed for each of the major horizons of a freely draining, upland, m…
Abstract Photocatalytic properties of PW12O403− (abbreviated as PW123−) for the 4-chlorophenol (4-CP) decomposition was investigated by using a 300 W Xe lamp at 35 °C in aqueous media. The rate of the 4-CP decomposition was not influenced by pH in the range from 1.0 to 2.0, where PW123− is stable. In the dark, no reac…
Transparent “all‐polymer” electrodes are promising candidates for applications in LCDs and LEDs and LEDs. A novel approach for making a new polyaniline‐based polymer is described, efficient solubilization of the conductive from of polyaniline is reported, and use of the resulting conductive polymer solutions for LCDs…
Vitrifiable liquid crystals (VLCs) have several advantages in optical applications: long‐term mesomorphic stability, environmental durability, ease of processing into thin films, and the capability of large aperture. A generic approach is demonstrated for the molecular design of VLCs with an elevated glass‐transition…
Isopenicillin N synthase (IPNS) was cocrystallised with ferrous sulphate and its substrate, delta-(L-alpha-aminoadipoyl)-L-cysteinyl-D-valine (Aad-Cys-Val). Vital to the successful procedure was the maintenance of a rigorously anaerobic environment. Hanging-drop vapour-diffusion crystallisation experiments, using lith…
A variety of SiC-Based composites and monolithic ceramics were characterized by measuring their thermal diffusivity in the unirradiated, thermal annealed, and irradiated conditions over the temperature range 400 to 1000°C. The irradiation was conducted in the EBR-II to doses of 33 and 43 dpa-SiC (185 EFPD) at a nomina…
Abstract There are several reports indicating that deformation and breakup of dispersed drops is easier in extensional flow field than that in shear. This is particularly true for the systems containing the dispersed phase significantly more viscous than the matrix, e.g., blends in which the viscosity ratio λ – η disp…
Abstract New organic/inorganic hybrid polymers, 2 : 1 type 3-(methacryloxy)propyl magnesium phyllosilicate and 2 : 1 type 3-(methacryloxy)propyl nickel phyllosilicate, were synthesized at room temperature by the copolymerization reaction of [3-(methacryloxy)propyl]trimethoxysilane to metal chloride hexahydrate. These…
Throughout the microstructure at every varistor, there exist variations of the grain size and the electrical properties of the individual grain boundaries. To calculate the effect of such microstructural variations on the overall electrical transport properties, we describe a multibond percolation approach utilizing e…
The gene coding for riboflavin synthase of Escherichia coli has been cloned by marker rescue on a 6-kb fragment that has been sequenced. The riboflavin synthase gene is identical to the ribC locus and codes for a protein of 213 amino acids with a mass of 23.4 kDa. It was mapped to a position at 37.5 min on the physica…
The relationship between surface sediment diatom assemblages and measured limnological variables in 33 coastal Antarctic lakes was examined by constructing a diatom-water chemistry dataset. Canonical correspondence analysis revealed that salinity and silicate each explain significant amounts of variation in the distri…
Article The Effect of Silica and Phosphate on the Transformation of Schoepite to Becquerelite and Other Uranyl Phases was published on December 1, 1996 in the journal Radiochimica Acta (volume 74, issue s1).
The structure of 5,10,15,20-tetraphenylporphinatonickel(II) ([Ni( tpp )]) has been studied by both X-ray diffraction (powder and single-crystal methods) and EXAFS. The bond lengths obtained from analysis of the EXAFS agree, within standard deviations, with those obtained from the X-ray diffraction studies. The Ni-N bo…
The thermomechanical properties of the shape memory effect and superelasticity due to the martensitic transformation and the R-phase transformation of a TiNi shape memory alloy were investigated experimentally. The transformation line, recovery stress and fatigue property due to both transformations were discussed for…
Small amounts of Li 2 O result in sintering in the AIN‐Y 2 O 3 ‐CaO and AIN‐CaO systems at firing temperatures <1600°C. The effect is ascribed to reduction of the liquidus temperature. Furthermore, Li 2 O is removed by volatization at temperatures from 1300° to 1600°C, and its content decreases several ppm from the…
Small cylindrical tubes were sintered in a microwave‐ induced oxygen plasma, initiated and sustained inside a tunable, single‐mode cavity. Temperature and shrinkage measurements of the specimens were achieved using an optical‐fiber thermometer black‐body sensor and a dilatometer, respectively. Sintering experiments at…
We present a simple treatment of the depletion-driven demixing transition in isotropic and perfectly aligned binary hard-rod mixtures. The simplicity is mainly due to the fact that we use the second virial approximation to the Helmholtz free energy in combination with a convenient Legendre transform. This combination…
The corrosion behavior of nitrogen ion (N2+)-implanted AZ91D magnesium alloy (UNS M11916) in 5 wt% sodium chloride (NaCl) solution was investigated using weight-loss measurement and electrochemical techniques. Ion implantation improved corrosion resistance at doses &gt; 1 x 1016 ions/cm2 (6.5 x 1016 ions/in.2). At…