Materials Literature
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The calculation of the current rating of crosslinked polyethylene insulated (XPLE) aerial bundled cables is based on the temperature rise of the conductors, whereas the external thermal resistance depends on the temperature rise of the surface of the cable. It is necessary, therefore, to calculate the temperature diff…
A kinetic study of the reaction Na + O2+ He [graphic omitted] NaO2+ He has been carried out in a fast-flow reactor in the temperature and pressure ranges of, respectively, 392–777 K and 4–14 Torr. Sodium atoms are generated either by thermal evaporation of sodium metal or by the technique of microwave-induced plasma a…
The results of experimental determinations of mass loss rates from (U,Zr)C exposed to flowing hydrogen at high temperature are reported. Two experimental techniques were used: isothermal heating of samples by arc jet and heating of long, porous, tubular samples by electrical self‐resistance. Total mass losses as high…
This paper reports on applications involving ceramics which require that this diverse group of materials act as either thermal insulators or thermal conductors. Values of thermal conductivity can range over more than 4 orders of magnitude from 0.1 W/(m {center dot} K) (0.7 BTU {center dot} in./(h {center dot} ft{sup 2…
A crystallographic and crystal chemical study has been performed on a new mineral, an orthorhombic MnSO 3 · 3H 2 O occurring in manganese ores at the Gambatesa Mine (Val Graveglia, Italy), associated with tephroite, bementite, braunite, hausmannite and hematite. Gravegliaite, appearing mainly as few radial aggregates…
Hydrogels were prepared from oxidized wood meals and chemical pulps by phosphorylation with phosphoric acid and urea. A transparent hydrogel, which was prepared from wood meals by oxidation with chlorite followed by phosphorylation, was capable of absorbing 115gH2O/g sample. As oxidant, peracetic acid and ozone were a…
A series of s-decyl glucopyranosides was prepared, and surface properties, such as static surface tension, critical micelle concentration (cmc), occupation area of a molecule at surface, dynamic reduction of surface tension and foaming properties, foam suppression in fermentation process using Baker's yeast, biodegrad…
Three (Ni,Mg) 3 (VO 4 ) 2 solid solutions have been prepared and studied. The crystal structures ( Cmca ; Z = 4) have been refined with the Rietveld profile technique on the basis of accurate X-ray powder diffractometer data. The Ni 2+ /Mg 2+ cation distribution is almost random, but nickel has a slight preference for…
The oxygen-deficient perovskite system SrCr0.1Fe0.9O3 –y has been studied by Mössbauer spectroscopy and X-ray powder diffraction techniques. The material obtained is strongly dependent upon the conditions of preparation. Partially oxidized materials annealed in air and quenched are simple cubic perovskites with consid…
The anomalous X-ray scattering (AXS) technique has been applied to obtain the environmental radial distribution function (RDF) around a zirconium in amorphous ZrO2 prepared by hydrolytic condensation of zirconium alkoxide. The environmental RDF was determined from the intensities measured at the Zr K absorption edge u…
Densified alkali borate glasses were prepared by applying hydrostatic pressure up to 6GPa near the glass transition temperature. The mechanical properties such as Young's modulus and hardness were measured. The yield stress for 5Na2O·95B2O3 and 10Na2O·90B2O3 glasses was calculated from the interference fringes of the…
Glasses doped with small sized-CdS crystals with a significant quantum size effect were prepared by the sol-gel process. Gels synthesized through the hydrolysis of a complex solution of Si(OC2H5)4 and Cd(CH3COO)2⋅2H2O were heated at 500° to 700°C, then allowed to react with H2S gas to form silica glasses doped with fi…
Adhesive matrix devices containing a model drug, isosorbide dinitrate (ISDN), were prepared with three different types of pressure sensitive adhesives (PSAs). ISDN permeation through excised hairless rat skin from the different devices was measured in vitro. For each PSA type, the steady state permeation rate of ISDN…
The tensile properties of Inconel 718 and Udimet 720 Ni-base alloys being used for liquid hydrogen fueled rocket engine materials were investigated in a high pressure hydrogen of 19.7MPa at room temperature. The results obtained are as follows;(1) Elongation, reduction of area and ultimate tensile strength in hydrogen…
Osmium tetraoxide smoothly reacts with NH2OH·HCl in the presence of oxalate ion furnishing solid complexes A[Os(NO)(C2O4)2]·H2O (A = K, 1a; PPh4, 1b; or AsPh4, 1c). The complex anion possesses a square-pyramidal structure, as is evident from analytical, spectroscopic (IR, UV/VIS), and thermoanalytical data. The comple…
Ozonolysis of digitoxin, digitoxin tetraacetate, digitoxin tetrakis-(2,2,2-trichloroethyl carbonate), digitoxigenin, digitoxigenin acetate, digitoxigenin hemisuccinate and digitoxigenin 2,2,2-trichloroethyl carbonate followed by treatment with excess of zinc in acetic acid gave either the corresponding 21-hydroxy este…
Abstract The paper proposes that the criterion of ‘eccentricity invariance’ should be considered when designing plate and shell elements. It shows that many such elements do not satisfy this criterion.
The relation between the stator current and the field current of a synchronous motor at a constant terminal voltage and with a constant shaft load is known to be a V curve. It is shown, by both experiment and calculations, that the stator current of a hysteresis motor also shows a V curve. The mechanism of the V curve…
ABSTRACT Arsenic acid is the principal chemical desiccant used to prepare cotton for harvesting by stripping on as many as 2 million acres annually in Texas and Oklahoma. Because the arsenic acid is applied when bolls are open, cottons from treated fields contain arsenic. The amounts present on cottons from desiccatio…
The hydrothermal stability of both Cr/polyimide and C75Cr2/polyimide interfaces has been studied using Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and peel testing. It was found that RF sputter treatment of the polyimide surface prior to metal deposition leads to an enhancem…