Materials Literature
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Microstructure effects on the strength of U02 pellets have been investigated. The strength was measured at room temperature using a biaxial flexure technique in which thin disk specimens, sliced from U02 pellets, were fractured by ring loading in the specimen center. The strength of U02 was reduced, in all cases, by i…
The x-ray induced visible luminescence of SrTiO3 has been studied in the range 15–300 °K. An apparently single-emission band at 500 nm has been observed whose efficiency abruptly decreases at ∼30 °K. This luminescence band is proposed to be intrinsic and associated with the decay of a relaxed Ti+3O−53 exciton. After 1…
Abstract We suggest a theory of Ψ‐condensation, based on the assumption that a compact DNA particle is a globule, and specifically that a polymer solution is a strongly fluctuating system and that double‐stranded DNA is a stiff homopolymer single‐stranded chain. We show the DNA globule as it appears in a dilute poly(e…
Landau theory proved itself appropriate for describing phase transitions in systems such as ferroelectrics and ferromagnets. Primarily Landau established the theory for second order phase transitions. Later on Devonshire generalized Landau's approach to first order transitions. The essential point of Landau theory is…
Abstract The effect of carbon black on the processing characteristics and physical properties of jute fiber‐reinforced composites and the role of silica and carbon black in promoting the adhesion between jute fiber and natural rubber have been studied. It was found that presence of silica is not essential to develop a…
Abstract Economic, technological, and regulatory pressures gradually narrow the chemical variety of polymers: in 1975, the market share of polyethylene was 40 percent, poly(vinyl chloride), 23 percent, polystyrene, 12 percent, and polypropylene, 11 percent, adding up to 86 percent of all thermoplastics (1‐3). The same…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGold clusters. Tetrakis[1,3-bis(diphenylphosphino)propane]hexagold dinitrate: preparation, x-ray analysis, and gold-197 Moessbauer and phosphorus-31{proton} NMR spectraJ. W. A. Van der Velden, J. J. Bour, J. J. Steggerda, P. T. Beurskens, M. Roseboom, and J. H. NoordikCite t…
The characteristics of equilibrium first-order phase changes of the grain boundaries themselves are such that it leads to a definition of grain boundary phases in which smoothly curving boundaries are of the same phase. Different grain boundary phases coexist at facet edges and corners. The phase rule, phase diagrams,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of decomposition of tetrathionate, trithionate, and thiosulfate in alkaline mediaErnest. Rolia and Chuni L. ChakrabartiCite this: Environ. Sci. Technol. 1982, 16, 12, 852–857Publication Date (Print):December 1, 1982Publication History Published online1 May 2002Publi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrganic sonochemistry. Sonic acceleration of the Reformatsky reactionByung Hee Han and Philip BoudjoukCite this: J. Org. Chem. 1982, 47, 25, 5030–5032Publication Date (Print):December 1, 1982Publication History Published online1 May 2002Published inissue 1 December 1982https…
The electrochemical reduction of α‐, γ‐, δ‐, and amorphous FeOOH was investigated. These oxides were applied as pastes to weathering steel substrates and galvanostatically reduced in solutions of 0.1 M Na 2 SO 4 . Raman and infrared spectroscopy were used to monitor the reaction products. Amorphous, γ ‐ , and δ ‐ FeOO…
Abstract The tensile strength of oriented polyethylene filaments is discussed in relation to molecular weight. Short‐term tensile properties at room temperature were obtained in our laboratory and from the literature for polymer samples covering the molecular weight ( M w ) range from 54 × 10 3 to 4 × 10 6 , and polyd…
Abstract The interaction of the natural marine polymer chitin and its deacetylated derivative chitosan with chromium has been investigated. The uptake of chromium from aqueous solution was determined from changes in concentration as measured by atomic absorption spectroscopy. The uptake of Cr(III) on chitosan was sign…
Abstract The kinetics of crystallization of solvent‐free poly(vinyl alcohol) were investigated by isothermal crystallization at temperatures of 142–192°C, for up to 18 min. The crystallization isotherms were analyzed by Avrami's theory. The magnitude of the exponent n was almost constant (0.67–0.71) in the range of 14…
A heuristic algorithm is presented for fast and accurate evaluation of complex Hankel transforms of orders 0 and 1. Concepts using linear digital convolution are introduced, where Bessel function evaluations are not required. Related convolution is defined over a set of transforms whose integrands are related algebrai…
Expressions for the incoherent-scattering function and the inelastic-scattering cross-section differential with respect to the solid angle for detection of scattered x rays from atomic, molecular, and condensed-matter targets are derived in the relativistic impulse approximation for Compton scattering. It is shown tha…
Two closely related mRNAs (11.0 and 9.6 kilobases long) for sericin, a cocoon protein other than fibroin, were isolated from the middle silk gland of Bombyx mori. They were shown to be specifically accumulated in this particular part of the gland. Nine genomic clones complementary to the mRNAs were isolated from the r…
Interfacial bonding and stability of gamma-methacryloxypropyltrimethoxysilane with silica surfaces have been studied by means of infrared spectroscopy. The addition of n-propylamine enhances silanization of gamma-methacryloxypropyltrimethoxysilane to silica surfaces in normal aliphatic hydrocarbons, and cyclohexane yi…
Data are presented on several dielectric materials which typically possess varying degrees of pyroelectric response depending largely on the electrical (poling) and thermal (heating) conditioning of the materials. A measurement technique described in the preceding paper was used to analyze these materials. The results…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT1,4,7-Triazacyclononane-N,N',N''-triacetate (TCTA), a new hexadentate ligand for divalent and trivalent metal ions. Crystal structures of [CrIII(TCTA)], [FeIII(TCTA)], and Na[CuII(TCTA)].bul.2NaBr.bul.8H2OKarl Wieghardt, Ursula Bossek, Phalguni Chaudhuri, Willy Herrmann, Ber…