Materials Literature
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Nanocrystalline materials which can be plastically deformed at low temperatures have revolutionized the applications for ceramics. Two methods for the production of high‐tech ceramics with grain sizes of less than 1 pm are described and the quality of the materials, for example ZrO 2 powder (see figure), assessed. mag…
A three-dimensional finite element method using the A- phi formulation for analyzing time-periodic nonlinear magnetic fields with eddy currents has been developed. The CPU time of this method can be reduced to below that of the conventional step-by-step method, because the new method calculates the time-periodic pheno…
The structural integrity and substrate binding properties of the two genetically engineered domains of yeast phosphoglycerate kinase were investigated using one- and two-dimensional nuclear magnetic resonance techniques. Both domains were found to fold with regions of native-like structure, with the N-domain showing g…
Infrared spectra are reported of adsorbed products from exposure of Rh/Al2O3 at ca. 300 and 473 K to propene–NO mixtures, ethanoic acid, acetone and acrolein. Ethanoic acid was dissociatively adsorbed, giving ethanoate ions on alumina and a rhodium carbonyl species. The latter species was also formed from acrolein whi…
A crystal chemical investigation of the Ca 3 (PO 4 ) 2 -EuPO 4 system has pointed out the existence of a continuous solid solution of formulation Ca 3−x Eu 2x/3 (PO 4 ) 2 (0≤x≤3/7) and of whitlockite-type structure. The lattice evolution has been analyzed by X-ray diffraction and emission spectroscopy, the Eu 3+ ion b…
The Deep Level Transient Spectroscopy (DLTS) technique was applied to characterize the interface states at the grain boundaries of ZnO varistors. Two types of commercially available varistors, Bi-type and Pr-type, were tested. The ordinary DLTS method for both varistors gave similar spectra showing two peaks. These tw…
Abstract
Cotton wrapped polyester core yams produced on a modified ring spinning frame were compared with yams spun from staple fiber blends. The yams contained ap proximately 70% cotton and 30% polyester. Yarns and fabrics made from both regular and high tenaeity polyesters were evaluated. Fabrics produced from the core yams…
Liposidomycin C (C42H67N5O21S, M.W. 1009) is a novel nucleoside antibiotic containing uracil, a sulfated aminosugar, and a fatty acid. It is a specific inhibitor of peptidoglycan synthesis of bacteria, inhibiting the formation of the lipid intermediates from uridine 5'-diphospho-N-acetylmuramyl-L-alanyl-D-glutamyl-mes…
Thermal diffusivity and conductivity as well as specific heat were studied for capsule-HIP sintered Si3N4. Yttria and alumina additives with a total amount of 6mol% were used. For a given additive percentage, specimens of higher β phase fraction had higher thermal diffusivity and conductivity, as expected However, sam…
Abstract The effect of micromixing limits on a process of crystallization in an MSMPR crystallizer is studied with respect to power law growth and nucleation kinetics. Three limiting cases corresponding to maximum mixedness and complete segregation in an MSMPR crystallizer and plug flow configuration were analyzed for…
MoO2CI2[3-(diethoxyphosphinyl)camphor] is a highly active catalyst for the epoxidation of alkenes by ButOOH; for polybutadiene containing cis-1,4-trans-1,4-, and 1,2-polymerised units, very high selectivity to the backbone double bonds is observed.
ABSTRACT Studies were conducted to determine the potential of ultrasonic energy as a heat transfer enhancing agent in sterilization applications. Metal transducer particles were immersed in warm liquids with and without sonic agitation, and temperature histories were recorded. Convective heat transfer coefficients wer…
Asclepias vestita from Commatti Canyon in California has yielded nine new 19-oxo cardenolide glycosides and one genin, all with the 5(6) double-bond, viz 5,6-dehydrocalactin, 5,6-dehydrocalotropin, 5,6-dehydroasclepin, 5,6-dehydrouscharidin, 5,6-dehydrocalatoxin, 16α-hydroxy-5,6-dehydrocalotropin, 16α-acetoxy-5,6-dehy…
The i- phi hysteresis characteristic of a transformer is modeled and simulated by a curve-fitting technique, including a consuming function for representing hysteresis loss. The method is established on the basis of measured hysteresis data and allows direct calculation of hysteresis losses. The analytical expression…
The overall thermomechanical behavior of Shape Memory Alloys is described from a microphysical point of view. Results obtained in that way are in good agreement with uniaxial tension test experiments performed on a Cu -Zn -Al Shape Memory Alloy.
Abstract A precise and practical method for the determination of d-values and lattice parameters from digital diffraction data is described. Systematic errors are corrected mathematically during a d-spacing / lattice-parameter least-Squares refincment process making it unnecessary to use internal standards. X-ray and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic and spectroscopic characterization of the high-spin (6A1) .dblharw. low-spin (2T2) transition in an iron(III) complex of pyridoxal thiosemicarbazoneMadan Mohan, Puranam H. Madhuranath, Alok Kumar, Munesh Kumar, and Narendra K. JhaCite this: Inorg. Chem. 1989, 28, 1,…
Fine grained Cu–Al–Ni–Ti alloys have been subjected to post quench ageing tretments in the β-phase. The resulting changes in transformation characteristics, particularly As, and the physical and mechanical properties of martensite have been studied. The As shifts are discussed in terms of quenched-in-short range disor…
We have investigated ascorbate/Cu(II) cleavage of double-stranded DNA in the presence and absence of DNA negative torsion. We found that ascorbate/Cu(II) cleavage shows a site-specificity that is dependent on negative torsion and is influenced by the nature of the salt, ionic strength, and pH. This provides strong evi…