Materials Literature
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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…
On reaction with organolithium compounds, N-substituted metalloporphyrins gave mixtures of mono-β-alkylated chlorins and hydroxychlorins, whereas free-base porphyrins give meso- + β- mono- and dialkylated products. Reduction of N-substituted porphyrins with tosylhydrazine or sodium tetrahydroborate opened new routes t…
In a prospective cladding material for the long-life core of the Liquid Metal Fast Reactor, our efforts are taken into the oxide dispersion strengthened (ODS) ferritic steels, which have more swelling resistance than austenitic steels and are expected to have superior creep strength at elevated temperature of 973 K.It…
Using finite difference calculations in continuum equations and using deterministic kinetic equations for calculations in a discrete lattice, the problem of the asymmetry, related to the strong concentration dependence of the diffusion coefficient in the diffusional mixing of binary multilayers, was investigated assum…
Previous studies have reported the existence of a green photoluminescence (PL) band in oxygen-deficient silica glass when exposed to ultraviolet (UV) light. Oxygen deficient defects (Eδ′) were thought to be the origin of this PL band. In this article, we describe the characteristics of a green PL band in oxygen-surplu…
Crystals of triglycine sulphate (TGS) doped with orthonitroaniline (ONA) irradiated with different doses of gamma-radiation were used to investigate gamma-radiation effect on electrical and optical parameters. The absorption coefficient and the reflectance were measured and hence the extinction coefficient, the optica…
The electrical behavior of commercial ZnO varistor devices has been examined with voltage contrast microscopy and point contact dc electrical measurements. Nonlinear voltage‐dependent behavior has been observed across both of the major crystalline boundary types present in the system: Bi 2 O 3 layer containing ZnO gra…
Three novel quaternary selenoarsenates could be synthesized by the solventothermal reaction of [AsSe 3 ] 3 - anions with AgBF 4 in the presence of the respective alkali metal cation. Orange crystals of K 3 AgAs 2 Se 5 ·0.25MeOH ( I ) are formed after reaction in MeOH at 130 °C for ∼2 h. Its structure is built up of ψ-…
Abstract The title compound, a new terphenoquinone derivative, shows a dynamic redox behavior upon cyclic voltammetry and a reversible, photochemical-thermal isomerization between the quinone and diradical forms, both phenomena involving restricted conformational change.
This work studies the ternary Si-C-N phases ${\mathrm{SiC}}_{2}{\mathrm{N}}_{4}$ and ${\mathrm{Si}}_{2}{\mathrm{CN}}_{4},$exploiting an analogy between the NCN and O groups. Starting from the molecular model of ${N,N}^{\ensuremath{'}}\ensuremath{-}\mathrm{bis}(\mathrm{trimethylsilyl})\ensuremath{-}\mathrm{carbodiimide…