Materials Literature
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Fatigue tests were carried out on a notched specimen of an annealed commercially pure titanium under push-pull loading, in order to clarify fatigue notch characteristics, especially the reason why the metal is extraordinarily insensitive to notch in fatigue. The initiation and initial growth of a crack at the notch ro…
Novel intercalation compounds with silver and copper ions in the interlayers of layered perovskite-like parent materials, ALaNb2O7, have been prepared. Silver ions were readily intercalated by exchange between isovalent ions. Copper was intercalated by the reaction of copper(II) nitrate aqueous solution with n-C8H17NH…
Metallization and bonding of AIN ceramics were made using active brazing metal (Ti-AgCu). Active brazing metal used in metallization and bonding was in paste form prepared by adding Ti powder and organic solvent in to eutectic silver brazing metal powder.Characterization and bonding mechanism of the bonded layer, and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPoly(3-phenylquinoxaline): a new thermally stable polymerTreliant FangCite this: Macromolecules 1991, 24, 2, 444–449Publication Date (Print):January 1, 1991Publication History Published online1 May 2002Published inissue 1 January 1991https://pubs.acs.org/doi/10.1021/ma00002a…
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…