Materials Literature
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X-ray-absorption fine-structure (XAFS) measurements of lead from 10 K through and above the melting transition at 600 K have been carried out. A cumulant expansion analysis provides data on the first four moments of the radial distribution of the first shell, which are used to construct a consistent temperature-depend…
Potential n-type dopants in diamond are investigated via ab initio methods. The well-known distortions around the deep donor N are found to arise from the interaction of the N lone pair with a C dangling bond. P, Li, and Na are all shallow dopants, but their solubilities are muh too low for doping via in-diffusion. Li…
The thermoelectric properties of 28 sintered Si0.8 Ge0.2 alloys, heavily doped with either boron or phosphorus and prepared from powders with median particle sizes ranging from about 1 μm to over 100 μm, have been determined from 300 to 1300 K. The thermal conductivity decreases with decreasing particle size, however,…
Hole mobilities have been measured in vapor deposited films of 1,1-bis(di-4-tolylaminophenyl)cyclohexane (TAPC) and TAPC-doped bisphenol-A-polycarbonate (BPPC). Over an extended range of temperatures, the mobilities decrease with increasing field at low fields. At high fields, a log μ∝E1/2 relationship is observed wit…
Lead titanate (PbTiO 3 ) thin films have been deposited on silicon, platinum-coated silicon and titanium silicide by RF-magnetron sputtering from pressed powder targets. The film structure was investigated by X-ray diffraction and was found to be strongly dependent on substrate temperature. Dielectric properties of th…
The photostimulated luminescence (PSL) and thermally stimulated luminescence (TSL) properties of two new X-ray storage phosphors, Ba 2 B 5 O 9 Br-Eu 2+ and Ba 5 GeO 4 Br 6 -Eu 2+ , are reported and discussed. The PSL measurements show that bromine vacancies act as electron traps and that Eu 2+ is involved in the hole…
(Uploaded by Plazi for the Bat Literature Project) No abstract provided.
Isolation and Structure Elucidation of Ergokonin A and B; Two New Antifungal Sterol Antibiotics from Trichoderma koningii Isolation and structure elucidation by 2D‐NMR spectroscopy of the two new antifungal sterol antibiotics ergokonin A ( 1 ) and B ( 2a ) from Trichoderma koningii are described. The structures of 1 a…
Two-dimensional arrays of mutually coherent optical beams are needed in holographic interconnections for both recording and reading gratings. We analyze the use and limitations of binary phase Fresnel lenses to generate beams for these applications. Two known techniques of ion beam milling and thin film deposition are…
A 4.8 kb DNA-fragment was cloned and sequenced encompassing the structural gene of PFL-deactivase (2.7 kb) and 2 kb of the 5' flanking region that contains the elements for anaerobic induction. A mutant lacking deactivase was shown to require exogenous electron acceptors for anaerobic growth with glucose. This reveale…
This paper presents a multi-dimensional thermomechanical constitutive model for shape memory alloys. This constitutive relation is based upon a combination of both micromechanics and macromechanics. A variable of martensite fraction is introduced in this model to reflect the martensitic transformation that determines…
Boron-doped homoepitaxial diamond films were selectively grown using sputtered SiO2 as a masking material. Uniform thickness, down to 50 nm, over a large area can be achieved with this technique. Hall mobility of selectively grown films is comparable to that of high-pressure high-temperature synthetic bulk diamond wit…
We report on the observation of interference between intrinsic voltage oscillations generated by sliding spin-density waves and an externally applied ac current in (TMTSF${)}_{2}$${\mathrm{AsF}}_{6}$ (TMTSF denotes tetramethyltetraselenafulvalene).
Stoichiometric films of bismuth titanate, Bi4Ti3O12, have been grown for the first time by the technique of pulsed excimer laser deposition. Ferroelectric films were obtained at temperatures as low as 500 °C on Si(100), MgO(110), and Pt-coated Si(100) substrates. Hysteresis measurements using a Pt-coated Si sample yie…
The R${\mathrm{Mn}}_{2}$ compounds are characterized by an instability of the Mn moment in a highly frustrated crystallographic structure. Although quite general, this problem has not yet been treated. A model derived from the Hubbard Hamiltonian is proposed. It accounts for the new physics observed: complex ordered p…
We show how Raman optic-mode peak positions and relative intensities can be used in a straightforward way to determine crystallite composition in CdSxSe1−x nanocrystals embedded in glass. These Raman techniques are particularly useful for low-concentration or small-crystallite-size composites where x-ray diffraction i…
The magnetic moments of the RFe 2 (R=Gd-Yb) Laves phase compounds have been calculated. Agreement with published measured values for single crystals is excellent. The R 4f magnetic moments were obtained from the standard Russell-Saunders scheme but the radial 4f spin density was otherwise part of the self-consistent d…
ABSTRACT Phosphonates are commonly used in the petroleum industry to control scale and corrosion. In order to understand the fate of phosphonates in the reservoir after an inhibitor squeeze, both the kinetics and the equilibrium aspects of phosphonate sorption have been studied in the laboratory using batch apparatus…
Abstract The relaxation processes and thermal properties of a series of blends of a highly linear high‐density polyethylene (HDPE) with several branched high‐density, linear low‐density (LLDPE) and low‐density polyethylenes (LDPE) have been measured. For the sake of comparison, all the samples were subjected to the sa…
Abstract The evolution of organic vapors from encapsulants at elevated temperatures has been implicated as the source of the degradation of the gold–aluminum intermetallic of the wire that connects the bond pad to the leadframe in an integrated circuit. Gas chromatography/infrared spectroscopy/mass spectrometry were u…