Materials Literature
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A new 13% Cr martensitic stainless steel (0.025% C-13% Cr-Ni-Mo) with excellent resistance to carbon dioxide (CO2) corrosion and good resistance to sulfide stress cracking (SSC) was developed, and its application limits in oil and gas environments were clarified. The CO2 corrosion rate of the 13% Cr steels with Ni and…
Amylose-iodine (AI) complex has been synthesized in aqueous solution without added KI. Complex formation (with solid iodine in amylose solution) is maximized at approximately 35°C and decreases beyond that temperature. Ion-selective electrode (ISE) measurements of an aqueous solution of iodine and AI complex indicate…
The paraelectric and the ferroelectric/ferroelastic structures of Pb(2)KNb(5)O(15) have been refined by the Rietveld method from neutron and X-ray powder diffraction data. The paraelectric phase is tetragonal (space group P4/mbm) with lattice parameters a(t) = 12.646 (1) and c(t) = 3.9551 (2) Å at 790 K. The Pb- and K…
New experimental evidence has been obtained confirming the significance of deep traps for thermal quenching of luminescence and establishing the main features of thermoluminescence (TL) of the dosimetric peak in a-Al2O3 crystals. The TL yield relative to the heating rate and temperature dependence of the mean activati…
A novel bismaleimide (BMI), bis(4-maleimidophenoxy-3,5-dimethylphenyl)naphthylmethane, containing a pendant naphthalene and aryl ether linkage, was synthesized from bis(4-hydroxy-3,5-dimethylphenyl)naphthylmethane through multistep reactions. The BMI was characterized by Fourier transform infrared spectroscopy, elemen…
Abstract Several useful composite materials have been developed with natural fiber and plastic matrices, and their commercial viability has been established in terms of adding value to abundant and cheap natural resources. The Macromolecular Research Centre, Jabalpur, India, has recently developed composite from waste…
A series of oligomeric and first generation dendritic materials based on silane-siloxane and silsesquioxane core has been synthesised. The attachment of cyano-biphenyl mesogens separated by spacers to these cores which were varied systematically, resulted in liquid-crystalline materials. The synthesis of the materials…
The phase equilibria between β and α titanium, Ti3 Al (α2 ), and Ti5 Si3 have been investigated in the temperature range 700–1200°C, for binary and ternary titanium alloys containing 14–22 at.-% aluminium and 1–3·5 at.-% silicon. These results have been used to construct sections of the ternary phase diagram. Silicon…
BACKGROUND: The presence of malignant breast cancer cells in bone marrow or peripheral blood is a prognostic factor. We tested the capacity of a novel magnetic cell analyzer to detect rare cancer cells in mixtures with human peripheral leukocytes. METHODS: Human peripheral leukocytes were spiked with cells of the MCF-…
We report the polarized infrared and optical reflectance of ${\ensuremath{\beta}}^{\ensuremath{''}}\ensuremath{-}(\mathrm{ET}{)}_{2}{\mathrm{SF}}_{5}{\mathrm{CH}}_{2}{\mathrm{CF}}_{2}{\mathrm{SO}}_{3}$ as a function of temperature. This fully organic superconductor displays weakly metallic behavior over the entire tem…
Results on the dynamics of silica are presented: vibrations and relaxations. Using molecular dynamics, glass structures are generated by rapidly quenching melts below the glass transition. For the local minima of the structures the vibrational density of states is determined, the structures of the eigenmodes are analy…
The formalism developed in molecular theory for calculation of local electronic-structure characteristics in a nonorthogonal atomic basis is generalized to systems with translational symmetry. Expressions have been derived to describe the bond orders, covalency, and valence in a crystal for restricted and unrestricted…
Abstract The effects of the injection‐molding induced skin‐core morphology on the fracture behavior of rubber‐toughened polypropylene (RTPP) systems were studied by employing the essential work of fracture (EWF) method. RTPP with 31 wt% ethylene/propylene rubber (EPR) showed no skin‐core structure after molding and th…
β‐cristobalite (SiO 2 ) and β‐carnegieite (NaAlSiO 4 ) have been investigated by Raman spectroscopy up to their melting points at 1999 and 1799 K, respectively. In both cases, the major spectral changes are observed at the α‐β transitions, near 540 and 970 K, especially at low frequencies where the modes, involving ma…
Simultaneous measurements of thermoluminescence (TL) and thermally stimulated conductivity (TSC) are reported on single-crystal dosimetry-quality Al<inf>2</inf>O<inf>3</inf>:C following gamma irradiation at room temperature. Analysis of the data reveals a superposition of several first-order TL…
The oxidative coupling of 2-naphtol to 2,2′-dihydroxy-1,1′-binaphthyl (binaphthol) by air or oxygen has been carried out in the presence of Cu2+- and Fe3+-doped MCM-41 aluminosilicate as catalyst. Fe-exchanged MCM-41 was found to be a very efficient catalyst; excellent mass balances (> 95%) with almost total conversio…
This article describes particulate fouling experiments performed on small-scale and full-scale plate heat exchangers for three different corrugation angles (30 deg, 45 deg and 60 deg). The velocity effect has been studied as well as the particle type and concentration effects. The test duration ranges between 20 and 1…
Effect of the chiral dopants molecular structure on the kind of the temperature dependencies of the induced cholesteric helical pitch has been studied for LC systems on the base of 4-pentyl-4′-cyanobiphenyl or 4-methoxybenzylidene-4-butylaniline including chiral S,α-phe-nylethylamine and E-1R,4R-2-(4-phenylbenzylidene…
Results obtained by the indirect zonal isotropic uniform random (IUR) estimation were compared with those obtained by the direct point and interception counting methods on vertical (VS) or IUR sections in a stereological study of bovine articular cartilage collagen fibrils at the ultrastructural level. Besides compari…
The physical aging behavior of an isotropic amorphous polyimide possessing a glass transition temperature of approximately 239°C was investigated for aging temperatures ranging from 174 to 224°C. Enthalpy recovery was evaluated as a function of aging time following sub-Tg annealing in order to assess enthalpy relaxati…