Materials Literature
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Abstract Micro‐Raman spectra of crystalline uridine were obtained at room temperature and at pressures approaching 40 kbar with the aid of a diamond‐anvil cell. There is evidence for a phase transition at about 12 kbar which is probably associated with changes in the hydrogen‐bonding interactions between the two molec…
This paper discusses the effect of applied tension, specimen size, fabric sett, and shear strain on the shear behavior of fabrics using the twist method of measurement. Shear behavior depends critically on applied tension, specimen size, and fabric sett. The specimen size does not seem to affect the coercive shear str…
Thin cerium overlayers, 3-10 Å, on aluminum are found to enhance dramatically the oxidation of the substrate at room temperature. Two logarithmic oxidation regimes are observed in the growth curve, one is assigned to the formation of a thin layer of a mixed Ce-Al oxide, and the other to the growth of bulk Al oxide.
Abstract Das Forschungsvorhaben zielte darauf ab, den Einfluß unterschiedlicher Korrosionsparameter auf die Korrosionsschwingfestigkeit von mit 13 bzw. 17% Chrom legierten Stahlgußwerkstoffen für Wasserkraftanlagen im Bereich hoher Schwingspiele (10 6 < N < 10 8 ) zu erfassen. Dabei wurde der gesamte Bereich der…
Raman spectroscopy of ${\mathrm{Li}}_{2}$${\mathrm{SO}}_{4}$ was performed for pressures in the range 1 bar to 80 kbar. The crystal remains in the original \ensuremath{\beta} phase if the pressure is kept below 13 kbar. At this pressure the spectrum undergoes qualitative changes in a continuous way as a function of ti…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn ab initio characterization of the tetraphosphorus oxide P4OLawrence L. LohrCite this: J. Phys. Chem. 1990, 94, 12, 4832–4835Publication Date (Print):June 1, 1990Publication History Published online1 May 2002Published inissue 1 June 1990https://pubs.acs.org/doi/10.1021/j10…
Physical properties of stoichiometric and non stoichiometric CuO are reported. The electrical conductivity has been measured on CuO pellets, sintered with the usual procedure for the preparation of Y Ba-Cu O superconductors and then deoxygenated under a nitrogen flow. It is shown that oxygen deficient CuO pellets pres…
Impact strength of nylon 6 was more than tripled by incorporation of 10% low-density polyethylene, ethylene/acrylic acid copolymers, or chlorinated polyethylenes. Chlorinated polyethylenes containing 36-42% of chlorine generally gave best retention of tensile and flexural modulus and strength characteristics.
The influence of heat treatment (heating followed by quenching prior to charging) on charge storage in fluoroethylenepropylene (FEP) and polypropylene (PP) foils is studied by a corona discharge or by a mono-energetic electron beam. The variables which affect the charge decay time and the TSD (thermally stimulated dis…
Abstract The XPS (x–ray photoelectron spectroscopy) O1s spectrum of PET [poly(ethylene terephthalate)] was examined in detail. Spectra of related compounds were also studied for comparison. The O1s peak profile of asymmetric doublet with π–π * satellites characteristic of PET was successfully explained both from compa…
An analysis is presented of the effect of tilt in the high-strain-rate pressure-shear plate impact experiment. Normal and shear tractions and the velocity difference across the specimen are obtained from free-surface particle velocity, tilt angle, closure direction, and impact velocity data. The effect of tilt in high…
Factors affecting the slope of the reactive ion etched molybdenum line have been studied with a simulation method and with experiments. Plasma chemistry and process parameters of the CF 4 / O 2 mixture for the molybdenum etch have been examined. The theoretical calculation matches experimental results. Surface topogra…
The effect of additives on DC treeing breakdown phenomena and space-charge formation in polymeric materials is studied under divergent fields. Experimental results are presented to show that: (1) The DC treeing breakdown phenomena are considerably affected by the space charge. (2) The presence of acetophenon in low-de…
The present study was performed to provide a better understanding of the morphological variations of mammalian hair. Terminal hair samples were obtained from different regions of the body of the same Caucasian male. All hair samples were either cleaned or treated before being examined with scanning electron microscopy…
Abstract : Modern warships designs require an increased utilization of high strength, alloy steel plate for weight reduction, stability, increased payload, and increased mobility. Naval ship structures are subjected to a complex spectrum of loads and service environments, and the structural steels and welding material…
Electronic Properties and Orientation Studies of Poly‐3‐Alkylselenophene Electrochemically Deposited on Pt As Observed by NEXAFS, Tourillon, G., Dartyge, E., Guay, D., Mahatsekake, C., Andrieu, C. G., Bernstorff, S., Braun, W.
Abstract Polymeric catenanes have been made from poly(2,6‐dimethyl‐1,4‐phenylene oxide) crosslinked in the presence of several, paucidisperse poly(dimethylsiloxane) cyclics of varying degrees of polymerization. The fraction of cyclic threaded or captured by the polymer network increases as the degree polymerization of…
Procedures for in vitro establishment, rapid shoot proliferation, and ex vitro plantlet acclimatization of Cryptocoryne lucens de Witt were determined. Shoot cultures were established from surface-sterilized shoot tips cultured on Linsmaier and Skoog salts and vitamins medium (LS) solidified with 0.8% (w/v) agar and s…
Abstract Different pure complexes were synthesized by an interchange reaction of BF 3 ‐etherate with amines in dichloromethane. All of the resulting complexes are solid, but they can be dissolved in a low‐molecular‐weight poly(ethylene oxide) to favour their use as initiators. DSC analysis demonstrated strong interact…
Aluminum chelate and calcium nitrate precursors were used to synthesize amorphous calcium aluminate powders by solgel processing at < 900°C. The method of preparation and results of characterization of the gels by thermogravimetric analysis, X‐ray diffraction, scanning Auger microscopy, and single‐point BET analysi…