Materials Literature
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A one-dimensional constitutive model for the thermomechanical behavior of shape memory alloys is developed based on previous work by Liang and Tanaka. An internal variable approach is used to derive a comprehensive constitutive law for shape memory alloy materials from first principles without the assumption of consta…
Factors determining the magnitude of critical current density, at which Zn began to deposit from impurityfree electrowinning bath, were studied on the basis of extra-overpotentials peculiar to hydrogen evolution. Electrochemical condition, which permitted codeposition of electrochemically less noble Zn with more noble…
Clothing pressures were measured in relation to the covered area at the waist for waistnipper and waistband at a reduction rate of 2.5%. A sensory test was carried out on subjects in relation to the clothing pressure. Clothing pressures at the waist line (W. L) for the waistband, for which the area covered at the wais…
An in situ Fourier-transform infrared study is presented for the spectral region from 250 to 1400 cm–1. Using supported samples the changes for the infrared-active lattice modes after protonation are studied for zeolites A, X, L, ZK-5, mordenite and for zeolites Y with Si : Al ratios from 2.4 to 40.Protonation of the…
The gene nprM encoding the calcium-dependent extracellular proteinase from Bacillus megaterium ATCC 14581 was cloned in the vector pBR322 and expressed in Escherichia coli HB101. The DNA sequence of the cloned 3.7 kb fragment revealed only one open reading frame consisting of 1686 bp with a coding capacity of 562 amin…
Conducting polymers are extensively used against electromagnetic interference. Unusually high electromagnetic shielding efficiency has been observed for inherently conducting polymer-coated metal/polymer composites.
Electron energy-loss spectrometry enables the detection of Li and Be via the K ion- ization edges. However, the detection and quantification of these low energy edges present several problems, like low edge-to-background ratios, problems with background extrapolations, overlapping of edges and multiple scattering in c…
Alkaloids 1-4 from Cynanchum vincetoxicum (asclepiadaceae) (Scheme 1) do not have affinity to the oestrogen receptor but they inhibit the growth of the hormone-independent mammary carcinoma cells MDA-MB-231 (Fig. 1) and bind to nucleosides and nucleotides (Table 1). Intercalation was not observed.
Oxygen plasma treatment as a surface functionalization technique is discussed. Oxygen-containing functionalities were introduced on the surface of high- (HDPE) and low-density polyethylene (LDPE) by glow discharge. The number of surface hydroxyl groups was increased by a post-discharge wet treatment in a reducing solu…
A theory is presented for the variation of the polydispersity index measured in a dynamic light scattering experiment performed on a suspension of aggregating colloidal particles. The analytical forms of this index, calculated by cumulants analysis, are described for various models of colloidal aggregation and numeric…
A carbon soot formed by arc evaporation and activated by heating under carbon dioxide is found to have a surprisingly high internal micropore volume (> 0.25 ml g–1) and an apparent BET surface area of ca. 700 m2 g–1, a large proportion of the pores are ca.⩽5 Å; transmission electron microscopy shows a highly disordere…
Potentiometric and calorimetric data for the complexation of lanthanide(III) cations by the neutral nitrogen-donor ligands diethylenetriamine or triethylenetetramine in anhydrous dimethyl sulfoxide at 25 °C and in an ionic medium of 0.1 mol dm–3 NEt4ClO4 have been obtained. All the complexes are strongly enthalpy stab…
Antonius Herry Cahyana, Yoshihiro Shuto, Yoshiro Kinoshita; Antioxidative Activity of Porphyrin Derivatives, Bioscience, Biotechnology, and Biochemistry, V
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface structure determination of thin films of benzimidazole on copper using surface enhanced Raman spectroscopyMary L. Lewis, Lars Ledung, and Keith T. CarronCite this: Langmuir 1993, 9, 1, 186–191Publication Date (Print):January 1, 1993Publication History Published onlin…
The room‐ and high‐temperature mechanical properties or a high‐strength, sintered silicon carbide were evaluated Room‐temperature strength was measured in four‐point bending. The room‐temperature fracture toughness was determined using a precracked single‐edge‐notched beam (SENB) bridge indentation technique. The high…
Description 23 papers written by internationally renowned scientists and engineers cover: • Heat Treatment: Carburizing and Through-Hardening • Surface Modification • Powder Metallurgy • Corrosion Resistant Bearing Steels • New Bearing Steels • Improvement of Rolling Contact Fatigue Life • New Bearing Steel Making Pro…
Cordierite powders have been obtained by the combustion of aluminum nitrate, magnesium nitrate, magnesium oxide, silica fume, ammonium nitrate, and urea mixtures. The thermal evolution of crystal phases has been studied using X-ray diffraction patterns and IR spectra. Magnesia derived cordierite attained 97% theoretic…
Four crystalline forms of tegafur were prepared by recrystallization from different solvents (α-, β-, δ-forms) and by heating (γ-form). They have been characterized using powder X-ray diffraction, thermal analysis, microscopy, density measurements and infrared spectroscopy. From differential scanning calorimetry measu…
The structure of rumbrin (Fig. 1), a new cytoprotective substance, was elucidated by NMR spectral analysis. Rumbrin was found to possess a novel skeleton containing alpha-pyrone, tetraene and pyrrole moieties.
Gas phase oxidation of benzene to phenol has been studied using Pd–Cu composite catalysts which were prepared mainly by impregnating the respective metal salts on silica gel. If one of the two metal species is absent from the catalyst, no catalytic activity is observed. Good performance is obtained with catalysts havi…