Materials Literature
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The ground state of the SiC3 molecule is found to be a closed-shell cyclic C2v symmetry structure which can be described as a four-membered ring with a transannular (cross ring) carbon–carbon bond, r(C–C)=1.469 Å. Theoretical studies with a triple-zeta plus double-polarization function (TZ2P) basis set in conjunction…
alpha-Spectrin, myosin light chain kinase (MLCK), and caldesmon have been detected in the nuclei of rat liver cells by 125I-calmodulin overlay, immunoblotting, and immunocytochemical methods. alpha-Spectrin is localized in the nuclear matrix, nuclear envelope, and nuclear pores. It has also been detected inside the nu…
Upon weekly i.m. injections of disodium gold thiomalate (Na2AuTM) 100% of A.SW mice produced IgG autoantibodies to antinuclear Ag and nucleolar Ag, respectively; about 70% of C57BL/6 mice produced IgG antinuclear Ag, whereas DBA/2 mice were resistant. Moreover, C57BL/6 mice, but not DBA/2 mice, showed increased mesang…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNuclear magnetic resonance study of polyisoprene/poly(vinylethylene) miscible blendsJoel B. Miller, K. J. McGrath, C. M. Roland, C. A. Trask, and A. N. GarrowayCite this: Macromolecules 1990, 23, 21, 4543–4547Publication Date (Print):October 1, 1990Publication History Publis…
An explanation for the mechanism generating a pretilted nematic liquid crystal conformation aligned on rubbed alkylbranched-polyimide layers is given based on a steric interaction model. An analytical calculation using this model was shown to agree fairly well with the data of torsional coupling strength obtained in t…
A model low-molecular-weight polymer mixture was studied as a function of temperature near the critical point by small-angle neutron scattering (SANS) and dynamic light scattering (DLS). SANS measurements reveal a crossover in the static susceptibility from mean-field to non-mean-field behavior at ${\mathit{T}}_{\math…
A model calculation based on the effective-medium theory of the oxygen-induced reconstruction of the (110) and (100) surfaces of Cu is presented. Equilibrium structures are calculated from a minimization of the total energy of the system. Missing-row-type reconstructions are found to be most stable in both cases, and…
Abstract This paper reports the use of Electron Parametric Resonance (EPR) for preliminary investigation of radicals formed from P,p'‐dioctyldiphenylamine (‘Irganox’, an antioxidant) during heating in a synthetic aviation lubricant base oil di‐2‐ethylhexylsebacate. Relative concentrations of radicals were found to be…
Abstract After a and ß irradiation of fine-grain samples from quartz annealed at 650 oC three PTTL peaks appear at 100 oC, 150 oC and 195 oC after first readout up to 245 oC and UV illumination. Two different wavelengths, 315 nm and 275 nm cause the most significant PTTL. The peak heights of the PTTL peaks depend on i…
The kinetics of the solid-state reaction between Al and Pd is studied in the geometry of a lateral Al-Pd diffusion couple in the temperature range between 250 and 430 °C. The first reaction phase is the crystalline Al3Pd2(δ) phase. After the growth of Al3Pd2 reaches a critical length, the quasicrystalline decagonal Al…
Abstract The band texture formation of nematic poly(1,4‐phenyleneterephthalamide) (PPTA)/H 2 SO 4 solutions after shearing between rotating plates was studied. For a thickness of the solution layer larger than 20 μm the band texture appears immediately after the cessation of shearing, but a critical shear rate is need…
A series of TiO(2) flint glasses has been developed for producing GRIN glass by ion exchange. Both positive and negative axial and radial gradients were fabricated in high index glasses by exchange of Li(+) for Na(+) and Na(+) for Li(+), respectively. Index changes to 0.05 and depths up to 6 mm were achieved and a wid…
SUMMARY. An ecological study of two small maritime Antarctic lakes on Signy Island, South Orkney Islands, was undertaken from January 1986 to March 1987. Analysis of diatom counts from the lakes provided examples of oligotrophic and mesotrophic ecosystems. A diverse community of 104 epiphytic taxa was identified. Twen…
Abstract The figure of merit Z is a measure for the effectiveness of the thermoelectric material p‐(Bi 1− x Sb x ) 2 Te 3 and depends on the valence band structure, the charge carrier scattering, the lattice thermal conductivity, and the free carrier density. It is shown that crystals with the composition x = 0.75 are…
Latex stage epoxidation of natural rubber with in-situ formed performic acid with and without acetic acid at room temperature were studied at various feed composition. Epoxidised natural rubber was characterised by IR, NMR and DSC. A simple kinetic model was developed from laboratory ex perimental data. Various side r…
Abstract We present data on the mechanisms of phototransferred thermoluminescence (PTTL) and optically stimulated luminescence (OSL) in single crystal CaF2:Mn (3%) and in TLD-400 chips. The TL peak under study is the main dosimetry peak near 275 oC. From measurements of the excitation spectra for PTTL it is found that…
Abstract This paper presents an experimentally‐based analysis of the continuous filament regime of the melt‐blowing process. The experiments were performed with a versatile air‐polymer die, several die operating temperatures, and three different polymer feed resins. The measurements discern the effects upon the final…
Abstract Thermal expansivities along the a, b, and c axes of the orthorhombic unit cell of poly (ether‐ether‐ketone (PEEK) crystals have been determined from 160 to 470 K by wide‐angle x‐ray diffraction. The expansivities along the a and b axes are positive while the expansivity along the c (chain) direction is negati…
We report the design and performance of narrowband transmission filters employing the rapidly changing extinction coefficient that is characteristic of BaF(2) and SiO(2) films within certain wavelength intervals in the vacuum ultraviolet. We demonstrate the design concept for two filters centered at 135 nm for BaF(2)…
Abstract 2,5-Bis(dicyanomethylene)-2,5-dihydrofuran with a 2,5-furanoquinonoid skeleton and its extensive conjugated homologues, 5,5′-bis(dicyanomethylene)-5,5′-dihydro-Δ2,2′-bifuran (8a), and 5,5″-bis(dicyanomethylene)-5,5″-dihydro-Δ2,2′:5′,2″-terfuran (12a), have been prepared as a new type of oxygen-containing elec…