Materials Literature
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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…
Abstract The X-ray structure of Fe(OEP)(OMe) is reported: Fe(C36H44N4)(CH3O), F.W.=619.7, monoclinic, P21/c, a=13.412(5) Å, c=18.912(8) Å, β=106.28(3)° and V=3348(4) Å3, Z=4. A methoxide-coordinated iron(III) porphyrinate with π-π dimeric porphyrin interaction in the solid state was revealed. The facile formation of t…
Degradation of interturn insulation caused by repetitive surges is studied for coils in three motors stators. In each stator, the coils are isolated and divided into several groups. Breakdown voltages of coils in one group are measured for 0.1 mu s risetime impulses and the average breakdown voltage of these unaged co…
Neutron diffraction maps have been used to assign the rotor conformations of the hydroxyl hydrogens in trypsin. Knowledge of these conformations is used to assess the relative importance of steric and electrostatic effects in conferring the H-bonding geometries of these groups. A general finding was that most hydroxyl…
The inelastic behavior of solid circular bars twisted to arbitrarily large strains is considered. Various phenomenological constitutive laws currently employed to model finite strain inelastic behavior are shown to lead to closed-form analytical solutions for torsion. These include rate-independent elastic-plastic iso…
The non-linear optical properties of semiconductors are reviewed. Examples are given of optical non-linearities which are connected with real or virtual excitations in the electronic system of a semiconductor, and others which are due to photothermal effects. Also included are some aspects of electro-optics, and the a…
Abstract The action of two vapour phase inhibitors (VPI), dicyclohexyl‐ammonium nitrite (DICHAN) and dicyclohexylamine (DICHAMIN), on the atmospheric corrosion of mild steel at a relative humidity of 100% and under isothermal conditions (25 °C) has been studied. In order to obtain electrochemical data with thin adsorb…