Materials Literature
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Second-order nonlinear optical (NLO) properties of crystalline materials depend both on the magnitude of the molecular hyperpolarizability (β) and on the orientation of the chromophores in the crystal lattice. If the molecular hyperpolarizability is to result in a nonzero macroscopic nonlinearity, the molecule must cr…
Researches and developments concerning aluminum matrix composites which are excellent in specific strength and specific modulus have been reported and applications of aluminum matrix components are expected as the structural materials of composites of automobiles and aircraft. However, there are few reports on the fat…
The aim of the present investigation was to produce highly fatigue tolerant P/M Ti-5Al-2.5Fe by the microstructure-controllable Blended Elemental (BE) method, in which as-sintered preforms are quenched from the beta phase region prior to HIP'ing. An extra low chlorine titanium powder and a 53.6Al-26.3Fe-21.1Ti master…
It is very important to have a good kinetic model which considers the effects of both ammonium and glucose for the control and optimization of the poly--hydroxybutyrate (PHB) fermentation. A kinetic model for the growth of Alcaligenes eutrophus and the biosynthesis of PHB under both ammonium and glucose limitation was…
Mechanical alloying (MA) of Fe-Mo binary system was performed by the low energy ball mill method.Elemental Fe and Mo powders were ball-milled up to 1000h.We characterized the reaction products by X-ray diffraction analysis, high resolution electron microscopy (HREM), and EDX analysis.From the X-ray diffraction pattern…
Total syntheses of the four isomeric N-methylprotoporphyrin IX dimethyl esters have been achieved by the MacDonald and tripyrrene/a,c-biladiene routes using appropriate N-methylpyrroles and N-methyldipyrromethanes as intermediates. The syntheses of related N-methyl and N,N′-dimethylporphyrins have also been achieved b…
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…