Materials Literature
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Abstract The rate of transformation from helical to all‐ trans ‐planar polytetrafluoroethylene (PTFE) at high pressures has been determined by monitoring the Raman spectra of PTFE following pressure jumps from the stability field of PTFE II to pressures between 9 and 14 kbar at temperatures between 0 and −30°C. The tr…
Abstract 1 H NMR spectra of polyisoprene were assigned using polymers of isoprene-1,1,4,4- d 4 , isoprene-1,1,5,5,5- d 5 , and isoprene-4,4- d 2 polymerized with various catalysts. The methylene-proton signal at 2.1 ppm in cis -1,4- and trans -1,4-polyisoprenes was divided into H 4 - and H 1 -proton signals; H 4 reson…
The immobilization of some medically useful enzymes were studied by means of radiation-induced polymerization at -78 degrees C. Glucose oxidase and glucose peroxidase were immobilized in the form of thin membranes inside polyvinyl chloride tubes and on polyethylene films; these membranes showed considerable activity y…
Abstract As with polybutadiene and SBR compounds, filled and unfilled vulcanizates of natural rubber exhibit long transients in their linear thermal expansion response following sudden changes in temperature. This is particularly noticeable when the materials are prestretched well beyond the point of thermoelastic inv…
For pt.CXXXVII see ibid., vol.B35, p.2384 (1979). LiNO 3.3H 2O has been studied by neutron diffraction at 120 and 295 K. The final R(w.F 2) values are 4.5% (120K) and 4.9% (295K). The crystal structure found in a previous room-temperature X-ray study is confirmed: one water molecule is involved in six hydrogen bonds;…
In order to examine the relative contribution of surface and gas phase reactions to the exothermic conversion of a fuel-air gas mixture flowing over a catalytic surface, we have carried out a theoretical and experimental study of catalytic combustion under stagnation point flow conditions. In the presence of exothermi…
Abstract RbTaO 3 kristallisiert monoklin mit a = 9, 58 9 , b = 8, 50 5 , c = 8,13 5 Å, β = 94,8 7 °, Z = 8, Raumgruppe C2/m. Nach der Strukturaufklärung (Vierkreisdiffraktometerdaten, 4° ≤ Θ ≤ 33°. 1014 hkl, MoKα, R = 9,9%) liegen über Rb verknüpfte [TaO 3 ]‐Schichten vor, in denen Ta je zur Hälfte oktaedrisch und tet…
The reduction in projected sodium outlet temperatures for commercial liquid-metal fast breeder reactors has renewed the interest in metal fuels. The U-Pu-Zr or Th-Pu-U-Zr metal fuel pins, sodium bonded to stainless-steel claddings, will yield high burnup along with adequate fuel-cladding compatibility. High burnup cap…
The permanent magnet properties of magnetic field aged Cr-Co-Fe alloys containing 5-9 weight percent (wt %) Co were investigated. By slow cooling from above the spinodal temperature under applied magnetic field, energy products of (BH)max= 4-6 MG . Oe were obtained. The effects of cobalt content, cooling rate, and app…
The damage threshold for brittle materials impacted by water drops has been studied by using a combination of analytic and numerical approaches to obtain solutions for the impact stress fields and dynamic stress intensity factors. It has been shown that expressions for the damage threshold, which consists of the activ…
Dielectric problems of SF6 gas insulated DC apparatuses were investigated. The DC breakdown voltages of the SF, gas gap become lower with larger electrodes. The decrease can be estimated fairly well for electrode areas of 101 to 104 cm2 on the basis of the statistical distribution of the initial breakdown field streng…
The conduction current to a probe incorporated into an electrode is proportional to the strength of the charge-carrier drift field; this current is modulated by a bias voltage applied betwen the probe and the electrode. The current/bias-voltage probe characteristics are described which have been derived from computati…
Abstract Alumina coated with potassium fluoride was found to be an effective and practical reagent for the synthesis of some simple crown ethers.
Abstract The marked discolorations observed on aged poly(vinyl chloride) (PVC) containing synergetic metal soaps, in the early heating stage, were due to the excessive coloration of π complex of metal chloride and double bonds in the polyene chain. These excessive colorations were inhibited by masking the excessive me…
The inner winding of a power transformer is subjected to radial electromagnetic forces under short circuit conditions. When these forces exceed a certain limit, transformer windings buckle. This paper deals with the buckling strength analysis of transformer windings, including the evaluation of the bending stiffness o…
Ferrous artifacts may have been manufactured from wrought iron, steel or cast iron. Heating such artifacts can cause changes in their metallurgical structures. The effects of heating and cooling ferrous material in different atmospheres is studied and recommendations made concerning types of ferrous artifacts which sh…
The infection of Pseudomonas acidovorans with bacteriophage phi W-14 leads to the gradual disappearance of dTTP from the cells and to the appearance of hydroxymethy dUTP (hmdUTP). Infected-cell contain dUMP hydroxymethylase and activities converting hmdUMP to humdUDP and hmdUTP. Hydroxymethylase appears immediately af…
The motion involved in the operation of an oscillating rheometer was analyzed, and revealed that the instrument measured a complex mixture of an instrument-dependent parameter, the spring constant, and two material-dependent parameters--the dynamic viscosity and the shear storage modulus. The significance of the worki…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExchange coupling in copper dimers with purine ligandsD. Sonnenfroh and R. W. KreilickCite this: Inorg. Chem. 1980, 19, 5, 1259–1262Publication Date (Print):May 1, 1980Publication History Published online1 May 2002Published inissue 1 May 1980https://pubs.acs.org/doi/10.1021/…
The ESR spectra of tetragonal-octahedral dichlorotetrakis(pyridine)- and dichlorotetrakis(pyrazole)cobalt(II) have been recorded. The former yields 811 = 3.33 and g, = 4.46, and the latter yields gl = 2.14, gz = 4.55, and g3 = 5.83. The g values of tetragonal-octahedral complexes are related to the bonding abilities o…