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For pt.XVI see ibid., vol.9, no.3, p.21 et seq. (1993). Early investigations into partial discharge (PD) phenomena are reviewed to illustrate how little has changed and how much has, in some respects, been repeated during the forty years from 1940 to 1980. The early days of PD research included studies of PD in gas-fi…
Silicon is used in the fabrication of microelectromechanical systems (MEMS). The friction and wear characteristics are of major design concern for any mechanical device requiring relative motion. In the present investigations we have studied the influence of ion bombardment on the microstructure, crystallinity, compos…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of uncertainties in thermodynamic data and model parameters on calculated process performanceWallace B. Whiting, Ting Man Tong, and Michael E. ReedCite this: Ind. Eng. Chem. Res. 1993, 32, 7, 1367–1371Publication Date (Print):July 1, 1993Publication History Published…
Abstract Much work in recent years had focused on the improvements of the impact properties of engineering thermoplastics by the addition of a low modulus modifier that contains polar moieties as a result of polymerization or that has been modified to contain polar moieties as a result of various grafting techniques.…
The crystal structure of a transition state/product complex formed by the interaction between proteinase K and the substrate analogue N-Ac-L-Pro-L-Ala-L-Pro-L-Phe-D-Ala-L-Ala-NH2 has been determined at a resolution of 2.2 A and refined to an R-factor of 0.165 for 12,725 reflections. The inhibitor forms a stable comple…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCommensurate and incommensurate lattice distortions in dysprosium selenide (DySe1.84) and rubidium dysprosium selenide (Rb0.33DySe2.67)Brendan Foran, Stephen Lee, and Meigan C. AronsonCite this: Chem. Mater. 1993, 5, 7, 974–978Publication Date (Print):July 1, 1993Publication…
Abstract A new type of biodegradable polymer material, poly(caprolactone)–poly(ethylene glycol) block copolymer (PCL‐b‐PEG), was synthesized by means of direct copolycondensation of ε‐caprolactone with poly(ethylene glycol) in the presence of a Ti(OBu) 4 catalyst. The degradability of the polycaprolactone was improved…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of a block copolymer on the kinetics of spinodal decomposition of polymer blends. 1. Nonuniversality in scaled characteristic quantities versus reduced timeTakeji Hashimoto and Tatsuo IzumitaniCite this: Macromolecules 1993, 26, 14, 3631–3638Publication Date (Print):J…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAsymmetric selenoxide elimination leading to chiral allenic sulfonesNaoki Komatsu, Tatsushi Murakami, Yoshiaki Nishibayashi, Toshio Sugita, and Sakae UemuraCite this: J. Org. Chem. 1993, 58, 14, 3697–3702Publication Date (Print):July 1, 1993Publication History Published onli…
We report field (H) and temperature (T) -dependent magnetization (M) of a member of the new class of high-${\mathit{T}}_{\mathit{c}}$ molecular-based magnets V(tetracyanoethylene${)}_{\mathit{x}}$\ensuremath{\cdot}y(solvent) with ${\mathit{T}}_{\mathit{c}}$ in an accessible range (solvent =${\mathrm{CH}}_{3}$CN). The…
Amorphous hydrogenated carbon (a-C:H) films and hydrocarbon films containing transition metals (Me-C:H) were prepared by glow discharge and reactive sputtering techniques at relatively low substrate temperatures (100 - 200°C). The tribological properties of both these types of coating materials will be compared. For s…
Electrochromic tungsten oxide thin films have been prepared by reactive dc-magnetron sputtering under different deposition conditions. Through the use of electrochromic coloration and spectroscopic ellipsometry experiments, the effect of preparation conditions on film morphology and electrochromic properties has been…
Abstract The dissolution of calcium carbonate with both organic and aqueous solvents was examined quantitatively and kinetically. Neither ethanol and nor acetone at 25 degrees C dissolved appreciable aragonite or calcite, even after nearly ten days. Bleach (sodium hypochlorite) was a much less effective solvent than d…
The optical constants of solid organic refractory (o.r.) residues are given in the range from 0.115 to 1.7 μm, both for as-deposited residue and after processing by 10eV photons and 3keV He + ions. Processing changes the optical constants in a manner characteristic of heat processing of amorphous carbon films. From th…
The mechanism of fouling of heat-transfer surfaces by crystallization and sedimentation from a flowing liquid was studied by performing tests under carefully-controlled conditions. A new mathematical model of fouling was developed, which is based on the physics and/or chemistry of the fouling process. Predictions of t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoinduced electron transfer in a porphyrin dyadDevens Gust, Thomas A. Moore, Ana L. Moore, Lana Leggett, Su Lin, Janice M. DeGraziano, Roel M. Hermant, David Nicodem, Peter Craig, and Cite this: J. Phys. Chem. 1993, 97, 30, 7926–7931Publication Date (Print):July 1, 1993Pu…
Electrical and optical properties of as-deposited, ion beam sputtered, Al-doped ZnO films have been studied as a function of film thickness and carrier concentration. Hall effect measurements reveal that the bulk electrical resistivity of the film generally decreases with increasing film thickness. Additionally, it is…
The crystal structure of activated tobacco rubisco, complexed with the reaction-intermediate analogue 2-carboxy-arabinitol 1,5-bisphosphate (CABP) has been determined by molecular replacement, using the structure of activated spinach rubisco (Knight, S., Andersson, I., & Brändén, C.-I., 1990, J. Mol. Biol. 215, 113-16…
As part of a systematic study of metals on oxides, we report here a study of the growth of Fe films on TiO2(110) surfaces using low-energy ion scattering and x-ray photoelectron spectroscopy (XPS). Our studies reveal that Fe grows initially in an island growth mode, and completely covers the TiO2 substrate for thickne…
We report neutron reflectivity and dynamic secondary ion mass spectroscopy measurements of surface segregation from symmetric, isotopic polystyrene blends, spin coated onto oxide covered silicon wafers, as a function of film thickness. The results of this analysis show that the segments of the deuterated polymer alway…