Materials Literature
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Aqueous extract of Teucrium polium was broadly used in folk medicine for treatment of gastric ulcer in Iraq and some Arab countries. In our laboratory the induction of gastric ulcer was done in starved rats by reserpine (20 mg/kg i.p.) or by stress. T. polium (150 mg/kg i.p.) as a crude extract produced 50% healing of…
During growth of Escherichia coli on acetate, the glyoxylate bypass supplies the precursors needed for biosynthesis. The glyoxylate bypass enzyme isocitrate lyase competes with the citric acid cycle enzyme isocitrate dehydrogenase for the available isocitrate. We have studied the control of metabolic flux at this bran…
Several porous silicas have been studied in order to determine the origin of porosity in random porous media. The silica system offers a unique opportunity to study the origin of porous structures because a variety of different structures can be synthesized depending on precursor chemistry and physics. In solution‐gro…
An in extenso analysis of the (B-X ) Br2 bromine absorption spectrum recorded by means of Fourier Transform Spectroscopy is presented. It is shown that the 80 000 recorded transitions covering the 11600-19 577 cm-1 range and published in an atlas form may be recalculated by means of only 39 constants : 38 are Dunham c…
Abstract A new technique is described for measuring the size distribution of submicrometer sized powders, such as carbon black. Powder is first dispersed as an aerosol and the particle size is subsequently measured with a differential mobility classifier and an aerosol concentration detector. The technique has been us…
The dielectric properties of hydrogen uranyle phosphate (HUP = H3 OUO2PO4.3H2O) and its sodium homologous (NaUP = NaUO2PO4, 3 H2O) have been studied between 10-2 and 1010 Hz. The samples are dense polycrystalline pellets sintered under pressure at 25°C. Three or two dipolar relaxations are observed for HUP or NaUP res…
The stability of fine particles of Nd2Fe14B type materials visavis O2is investigated through Arrhenius plots. It is found that partial Cr substitution for Fe increases oxidation resistance. Conditions for obtaining relatively high coercivities (Hc) in fine particles are discussed. It is shown that for fine particles t…
The equilibrium and kinetics of the reaction between nitric oxide and phthalocyaninatoiron(II), [Fe(pc)], in dimethyl sulphoxide (dmso) has been studied at 20 ± 0.5 °C. In the presence of a large excess of NO, [Fe(pc)] binds nitric oxide in a 1 : 1 mol ratio via pseudo-first-order kinetics. The observed rate constant…
The distribution of trace amounts of Sr between plagioclase solid solutions and a chloride-bearing hydrothermal solution decreases almost exponentially by a factor of 20-25 between the albite (Ab) and anorthite (An) end-members. A simple mixing model in the ternary system Ab-An-SrF (where SrF is strontian feldspar) le…
The geometry of individual steps on a crystal facet is fixed by the anisotropic step energy β(ϕ). On the basis of effective stresses on a step element, we briefly discuss the step shape and its matching angles with the facet edge or with a wall. When the step originates from a single screw dislocation, the facet may b…
A modeling approach for multifilament melt spinning of poly(ethylene terephthalate) fibers is outlined. The complex interactions between the filament bundle geometry and the quench conditions are likely to play a critical role in controlling spun fiber properties and their variability. Numerical results for typical co…
Hydrogen evolution from 60Co γ- and 3H β-irradiated molecular sieve 5A adsorbing HTO was measured. The results showed an additional evolution of H2(HT) gas due to energy transfer from molecular sieve to adsorbed water in both γ- and β-irradiations, and the yield at a given irradiation dose was higher than that from ra…
It is generally accepted that the onset and stable growth of edge delaminations under quasi-static loading can be characterized using the strain energy release rate G and delamination resistance curves (R curves). This study addresses the problem of edge delamination growth under fatigue loading. To characterize the f…
In this paper, an improved and simple self-consistent effective-medium theory is developed. The effect of dispersed second phase particle on the ionic conduction of ionic conductors is discussed by the theory. It is found that the theoretical result is consistent with experiments. The theory can perdict the effect of…
The study of superficial cracks of shot peened surfaces in terms of coverage rate, material nature and ball diameter shows the relation between cracks and dynamic behaviour of the sample surface during the impact. The shot peened layers are not deformed quickly enough under the shock.For the different shot peened stee…
Article Light Scattering Investigations of the Structure and Dynamics in Liquid-like Ordered Colloidal Suspensions* was published on January 1, 1987 in the journal Zeitschrift für Physikalische Chemie (volume 153, issue 1-2).
Two structures of the Werner complex [Ni(NCS)2(4Et-py)4](4Et-py = 4-ethylpyridine) in its non-porous α phase and the structures of its clathrates with p-, m-, and o-xylene, carbon disulphide, and carbon tetrachloride as the guest molecules have been elucidated. In all the structures the host molecules have octahedral…
After an introduction to what is required of a high-performance permanent magnet material, a brief description is given of the Concerted European Action on Magnets, a unique cooperative research programme which involves more than fifty participants (a third of them industrial) from nine countries in the EEC. There fol…
Benzocrown ethers carrying a para-substituted biphenyl group, (1a–c and 2a,b), display a nematic liquid crystal phase; selective complexation with picrates in the liquid crystal phase was observed by doping experiments.
The in vitro antiplatelet aggregating activity of magnesium and magnesium associated with soluble citroflavonoids (hesperidin and eriodictin, 1:1) is well-established. The degree of inhibition of in vitro platelet aggregation activity produced by different concentrations of magnesium halogenates was determined. ADP (4…