Materials Literature
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RATIONALE AND OBJECTIVES: The authors investigate the frequency of sister chromatid exchange (SCE) after the addition of gadolinium (Gd)-DTPA to venous blood samples. METHODS: Venous blood was obtained from nonsmokers. Samples were incubated with Gd-DTPA alone or in combination with mitomycin C, cytarabine, and dimeth…
The structural modifications and orientational ordering of nematic (SCB) droplets with the bipolar director-field configuration, embedded in a uniaxially stretched polyvinyl alcohol (PVA) matrix, are studied using polarized optical microscopy. It has been found that the unidirectional ordering of droplets with stretch…
Grain boundary diffusion of Cr in [10]/[112] symmetrical bcc bicrystals of Nb has been investigated in the temperature range from 950 to 1197°C with tilt angles, θ, from 2 to 21°. For 0·17°, the activation energy is independent of θ, with an average value of 181-2kJ mol−1, which is about half of the activation energy…
A void‐free SiO 2 interlayer dielectric film formation technology has been developed. This technology utilizes tetraethylorthosilicate [TEOS, Si ( OC 2 H 5 ) 4 ]/ozone ( O 3 ) atmospheric pressure chemical vapor deposition (APCVD) SiO 2 film gap‐filling, and the TEOS‐based dual frequency plasma enhanced vapor depositi…
Abstract Relaxation of pulsed photocurrents under optical bias is studied in amorphous films of ternary glassy alloys As 2 Se 3 :Sn x ( x = 0 to 3.5 at%) and (1− y )(As 2 S 3 ): y (Sb 2 S 3 ) ( y = 0 to 0.55) by the time‐of‐flight technique. In the frame of a multiple‐trapping model it is shown that by adding tin and…
In order to conduct valid epidemiological studies of nuclear power plant workers, good information on the workers' radiation dose histories is essential. Dose records held by a major dosimetry service company and on the Nuclear Regulatory Commission's Radiation Exposure Information and Recording System have been compa…
A peculiar step-growth (cationic) polymerization of bis(p-vinylphenyl) ether (BVPE) in nonpolar or slightly polar aromatic solvents in the temperature range from 70 to 150°C in the presence of 2.5–5.0 mmol/L of p-toluenesulfonic acid has been studied. Optimum polymerization conditions were found. New linear unsaturate…
We study volume stability of Voronoi polyhedra under hydrostatic pressures in a sodium glass. We optimize the atom positions under the pressures by an ab initio molecular dynamics method with an orbital-free density functional. The number of atoms in the supercell is 128. The change of the volumes is insensitive to pr…
The effect of duty cycle of pulsed dc currents on the critical length-current density product, (jl/sub c/), was measured using the Blech-Kinsbron edge-displacement technique [Thin Solid Films 25, 327 (1975)]. Unencapsulated Al edge-displacement segments mere stressed at various duty cycles and the critical lengths, th…
Computer analysis of the field emission from multilayered cathodes of Si–SiO2–Si [quantum well (QW)]–SiO2 for different system parameters (the thicknesses of the SiO2 insulator and QW layers, carrier concentration in the substrate, crystal orientation, etc.) has shown that a well pronounced peak on the Fowler–Nordheim…
The marine planktonic diatom Rhizosolenia robusta Norman is widely distributed in tropical and subtropical areas and occurs occasionally in more temperate ones. Traditionally it has been considered a species of the genus Rhizosolenia, but its taxonomic status has not been reviewed. The present study is based on light…
Abstract Clay liners have been widely used to contain toxic and hazardous waste materials. Clays absorb contaminant cations due to their exchange capacity. To improve the performance of the clay liner, fly ash, a waste material arising from the combustion of coal has been studied as a pre-filter material. In particula…
The effect of filler content and size on the mechanical properties of a new type of wood-based filler, oil palm wood flour (OPWF), in polypropylene (PP) was investigated. Four sizes of OPWF filler at different filler loadings were compounded using a twin screw compounder. All sizes of filler showed a similar trend of…
Abstract A comparative evaluation of different carbon black grades was performed for polymer composites whose matrices were composed of a single polymer, or polymer blend. The electrical resistivity, rheological properties, tensile strength and morphology were evaluated. The highest conductivity level was measured for…
Cathodoluminescence and photoluminescence of Bi12SiO20 and Bi12GeO20 samples are studied. Both kinds of samples show a dark orange central part or core. Emissions in the blue, green, and red spectral regions are observed. The 640 nm band is the predominant feature in the core emission. The evolution of this band durin…
Abstract The optical properties of Er 3+ ions in zinc borosulphate (ZnSO 4 · 7 H 2 O + B 2 O 3 ) and alkali zinc borosulphate (R 2 SO 4 + ZnSO 4 · 7H 2 O + B 2 O 3 , R 2 SO 4 = Li 2 SO 4 · H 2 O, Na 2 SO 4 , or K 2 SO 4 and Gd 2 (SO 4 ) 3 · 8H 2 O) glasses are reported. The assigned energy level data of Er 3+ (4f 11 )…
Abstract A simple and new synthetic method of tungstate thin films (CaWO4, MgWO4, PbWO4, ZnWO4) was developed. The absorption and luminescence spectra of tungstate thin films synthesized on quartz substrates were measured; the optical properties were also studied. It was found that CaWO4 has Eg = 5.4 eV of a direct tr…
Etching of a photosensitive polymer in high density oxygen plasma was studied. The polymer is a commonly used insulation material in a magnetic recording head. A quantitative relationship between etch rate and inductive power, bias power, and pressure was established by using the response surface method. Etch rate was…
The NIST Crystal and Electron Diffraction Data Center builds a comprehensive database with evaluated chemical, physical, and crystallographic information on all types of well-characterized substances. The data are evaluated and standardized by specially designed computer programs as well as by experts in the field. Fr…
The paper presents a new method of taking into account overlapping zones in stacked transformer cores for magnetic field calculations. The method has been worked out with the use of homogenization technique under the assumption that the distribution of magnetic flux between the layers of overlaps results from the tend…