Materials Literature
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Abstract The coupling model is formulated in terms of the dynamic constraint entropy, S c ( t ), and subsequently compared with measured tracer diffusion coefficients D for linear, 3‐arm star, and 12arm star polystyrenes in solutions of poly (vinyl methyl ether) (PVME) / o ‐fluorotoluene. Inequalities between the dyna…
The effect of three non-ionic contrast media (iosimide, iopamidol and iopromide) was investigated in rabbits and rats after single i.v. application up to high doses with regard to renal changes. Determinations of serum urea nitrogen and creatinine and urinary enzymes (lactate dehydrogenase, gamma-glutamyl-transpeptida…
Crystals of Rh 2 Sb were prepared by sintering the elemental components in a NaCl/KCl flux. They crystallize in the orthorhombic space group Pnma with the lattice constants α = 572.1(1)-573.6(1) pm, b = 417.1(1)-418.1(1) pm, c = 792.8(2)-794.9(1) pm, V = 0.1892-0.1906 nm 3 for the antimony- and rhodium-rich side, resp…
Abstract The energy response function of the semi‐imaging ISA Riber MAC 2 electron spectrometer has been determinated over the kinetic energy range 150–1500 eV. The absolute transmission of the analyzer is proportional to KE , with n ranging from 1.02 to 0.43 and K from 157.5 to 23.2 when the focusing voltage VF 1 of…
The mixed crystal ${\mathrm{Rb}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$(${\mathrm{NH}}_{4}$${)}_{\mathit{x}}$${\mathrm{H}}_{2}$${\mathrm{AsO}}_{4}$ of ferroelectric ${\mathrm{RbH}}_{2}$${\mathrm{AsO}}_{4}$ and antiferroelectric ${\mathrm{NH}}_{4}$${\mathrm{H}}_{2}$${\mathrm{AsO}}_{4}$ has been investigated for several…
Abstract There are many results concerned with the hamiltonicity of K 1,3 ‐free graphs. In the paper we show that one of the sufficient conditions for the K 1,3 ‐free graph to be Hamiltonian can be improved using the concept of second‐type vertex neighborhood. The paper is concluded with a conjecture.
Theoretical maximum weavability relationships of fabrics woven from regular warp ends and variable thickness filling yarns are derived by developing a local geometry where the thick filling place is interlaced with warp ends and where warp yarn is interlaced with thick and thin filling yarns. Geometric relationships a…
Semi-empirical relationships are given for corona inception fields in air, under both steady and impulse voltage conditions. These have been related to inception voltages and, in the impulse case, to the rate of rise of voltage. Experiments with impulse voltages of varying dV/dt, applied to hemispherically ended rods…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTQuinone-containing amphiphiles and bolaform amphiphiles that form redox-active lipid membranesJuergen Hinrich Fuhrhop, Hartmut Hungerbuehler, and Ulrich SiggelCite this: Langmuir 1990, 6, 7, 1295–1300Publication Date (Print):July 1, 1990Publication History Published online1…
Polypyrrole powder was electrodeposited on aluminum electrodes after previous anodic polarization to form pits. The pores are filled with overoxidized polypyrrole. Aqueous HNO 3 was employed as the preferred electrolyte. Point contacts at the entrance of the polypyrrole‐filled pits are provided, leading to a powdery P…
Abstract In Auger electron spectroscopy, both the primary electrons entering the sample and the Auger electrons leaving the sample may suffer strong diffraction effects. On well‐ordered single‐crystal surfaces, diffraction effects may result in variations in the intensity of an Auger peak by a factor of up to two or m…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMultinitrogen heteroaromatics studied at Pt(111) surfaces by EELS, Auger spectroscopy, and electrochemistry: pyrazine, pyrimidine, pyridazine, 1,3,5-triazine, and their carboxylic acid derivativesScott A. Chaffins, John Y. Gui, Chiu Hsun Lin, Frank Lu, Ghaleb N. Salaita, Don…
Penetration of high-speed targets, such as missiles or satellites, involves a glancing impact resulting from the velocities of the target and the projectile not necessarily being parallel to one another. Glancing is different from oblique impact in that here the target is in lateral motion relative to the projectile (…
A mechanism is proposed to describe the influence of redox reactions, which involve variable‐valence ions, on the diffusional mass transport of molecular dissolved oxygen in glassmelts. The concentration profile for molecular dissolved oxygen in a melt with diffusional transport in one direction in a Cartesian coordin…
The full infrared spectrum of well ordered N2O4(D2h) thin films is reported. Improved sample crystallinity is reflected in a fine structure of the internal mode bands that is less complicated than previously reported, and in a well resolved phonon spectrum. New assignments, notably for the v10(B2u) internal deformatio…
The development of dense polyphase tailored ceramic forms for the immobilization of high‐level nuclear wastes has been extended to an Idaho Chemical Processing Plant Fluorinel composition. The ceramic was designed to maximize waste loading and subsequent waste volume reduction without sacrificing chemical durability i…
Convergent‐beam electron diffraction and diffuse darkfield imaging of transmission electron microscopy were used to obtain qualitative information regarding the distribution of impurities in polycrystalline AIN. Impurities are distributed homogeneously within the grains of a given ceramic, but an amorphous grain‐bound…
A CrCr distance of only 2.394(1) Å was found in the binuclear complex 2, obtainable by decomposition of 1. Extended Hückel calculations gave five energetically similar frontier orbitals for six electrons. The high magnetic moment (μeff = 3.3μB) indicates the presence of a CrCr single bond.
Durch Platin‐katalysierte Hydrosilylierung zu Siliciumcarbid‐Keramiken: Das Vinylsilan 1 reagiert zu Oligomeren des Typs 2 , die mit LiAlH 4 zu den entsprechenden Wasserstoffverbindungen reduziert werden können. Diese ergeben bei der Pyrolyse in einer Ausbeute von etwa 32% (Theorie 69%) einen keramischen SiC‐Rückstand…
Three flavone glycosides have been hoisted from the fresh vegetative part of the medicinal herb Caralluma tuberculata. The chemical and spectroscopic properties are consistent with structures of Luteolin.4'-beta-D-glucopyranosyl-(2-->1)-alpha-L-rhamnopyranoside [1], Kaempferol-7-O-beta-D-glycopyranosyl (2-->1)-alpha-L…