Materials Literature
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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…
Abstract Shrinkage force measurements on drawn polyethylene terephthalate fibres have been evaluated in terms of the elastic behaviour of a molecular network. It is shown that for low network deformations the classical theory of Kuhn and Grün describes the stress‐optical behaviour very well. For high deformations, the…
Abstract Cotton, linen, polynosic rayon, standard rayon, nylon 6, and poly(ethylene terephthalate) (PET) fibers were treated with low temperature plasmas of O 2 , N 2 , Ar, CF 4 , and CO. The relative free‐radical intensities obtained by ESR spectra increased in the following order: linen > cotton > polynosic ra…
Abstract A theory is developed for predicting the solvent self‐diffusion coefficient in a crosslinked, amorphous polymer. The theory is based on a modification of the free‐volume theory of transport for the presence of crosslinks in the polymer. The general predictions of the theory for the variations of the self‐diff…
Abstract Mark–Houwink constants for polyacrylamide and poly(acrylamide‐ co ‐sodium acrylate) in 0.2M Na 2 SO 4 were measured using eight fractionated samples of polyacrylamide and 26 hydrolyzed polyacrylamide samples. The dependence of K and a on the copolymer compositions was found for the range of acrylate content 6…
Abstract Classical morphological analysis has been performed on novel PET fibers of high modulus and low shrinkage (HMLS). As expected, amorphous orientation controls the degree of shrinkage and tenacity. The uniqueness of these materials is derived from a high “effective” crosslink density which results in a high ret…
Abstract XPS, SEM, SSIMS, FTIR‐ATR, water‐in‐air, and air‐in‐water contact angle measurements have been used to unambiguously characterize the locus of failure of PP/epoxy joints. In the case of untreated PP, the fracture has been found adhesive, whereas in oxygen plasmatreated PP, it is cohesive, within bulk PP, but…
A two-state, four-orbital, independent electron analysis of the first optical molecular hyperpolarizability, beta, leads to the prediction that |beta| maximizes at a combination of donor and acceptor strengths for a given conjugated bridge. Molecular design strategies that focus on the energetic manipulations of the b…