Materials Literature
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The oxidation of 2, 5-diphenylfuran (1) with (hexamethylphosphoramide) oxodiperoxomolybdenum (VI), MoO5·HMPA, gave cis-1, 4-diphenyl-2-butene-1, 4-dione (2) and its cis-epoxide 3.2, 3-Diphenylpyrrole (4) was similarly treated with MoO5·HMPA to give the dimeric product 6, together with the cis-epoxide 3 and the trans-o…
Integral representations of integrals and derivatives with respect to the order of the Bessel functions Jv(t) Iv(t), the integral Bessel function Jiv(t) and the Anger function Jv(t) are presented. The Laplace transform technique is applied to derive them. The integral representations permit the evaluation of a number…
The viscoelastic properties of dry, normal, and glycerol-treated skin of the lower leg have been measured with a gas-bearing electrodynamometer (GBE). Elastic modulus measurements are shown to correlate well with visual assessment of the skin condition by a trained dermatological grader. Dry skin is generally stiffer…
The crystal and molecular structure of the mesogenic title compound (HBA) is described. Lattice parameters are: space group P1, a = 9.003(2) Å, b = 8.850(2) Å, c = 8.510(2) Å, α = 79.63(1)°, β = 65.04(1)°, γ = 87.41(1)° (at T = 299 K). The molecules contain a centre of symmetry and the phenyl rings are coplanar. In or…
The black compounds M[OsO4](M = Na, K, Rb, or Cs) have been prepared from OsO4 and MI in acetone. They are stable in dry air, but disproportionate immediately in aqueous acid solution to OsVIII and OsIV, and in basic solution to OsVIII and OsVI The i.r. and electronic spectra are reported and discussed. X-Ray powder d…
The dew points of phosphorus vapor over Sn–P alloys containing 45 mol%P or less have been determined at temperatures ranging from 703 to 973 K. The dew consisting of metastable liquid phosphorus, rather than stable red phosphorus, was utilized. The vapor pressures of P2 and P4 were determined from the dew points. Ther…
The unique tensile properties of keratin fibers in water led Speakman to develop the technique of fiber calibration which has become one of the mainstays of hair testing methodology. We have followed a similar approach in studying the torsional rigidity of hair. A simple modification allows for the torsion pendulum te…
The origin of large frequency dispersion in Mott‐Schottky plots was studied for electrodes, the surface structure of which was analyzed by x‐ray photoelectron spectroscopy (XPS) and impedance measurements. XPS spectra revealed that the atomic composition at the surface was different from that in the bulk. Impedance me…
Abstract
Subconjunctival injection of 0.2 ml of the following solutions was carried out once a day for two weeks in the albino and pigmented rabbit: commercial 0.5% timolol or 1% befunolol ophthalmic solutions, both containing benzalkonium chloride, and also these drug solutions containing no preservative, ophthalmic base solu…
The glycosides of Dregea volubilis (L). BENTH. were further investigated. Five new glycosides named dregeosides H (1), Dp1 (2), Da1 (3), Gp1 (4), and Ga1 (5) were isolated and their structures were characterized on the basis of chemical and spectral evidence.
Fluorine and chlorine effects on radiation-induced loss associated with the preexisting defects have been investigated. It is found that preexisting defects in fibers are closely related to radiation-induced loss. Fluorine and chlorine doping in GeO2-doped silica core optical fibers decreases GeO absorption at 0.24 μm…
This paper considers the subject of distribution transformers no-load losses and the factors that influence these losses. This paper reviews methods to correct errors in no-load loss measurement caused by excitation voltage distortion and temperature. These methods depend on the ability to separate no-load losses into…
Abstract Für die Charakterisierung chemisch modifizierter Stärkederivate ist die Kenntnis ihres Anteiles an funktionellen Gruppen erforderlich. Bei der Carboxymethylstärke ist es die CH 2 COONa‐Gruppe, deren molare Relation zu den Glucose‐Einheiten des Stärkemoleküls den durchschnittlichen Substitutionsgrad ergibt. M…
The purpose of this work is to study the relationship of energetic and physical properties of polymetric materials with ice adhesion, and to develop the material to prevent ice adhesion. From various parameters of water and ice, dispersion and hydrogen bond contribution of surface free energy of ice were calculated. U…
The low temperature fracture potential, fatigue potential, and deformation characteristics of first generation plasticized sulfur binders in paving mixtures are discussed. Fracture mechanics techniques were used in the characterization of these materials. Recommendations, based on properties of first generation materi…
Abstract Dynamic stress–strain diagrams of polyurethane packaging foams have been obtained from free fall drop tests. The dynamic curves become higher as the deformation rates increase. An equation is proposed to describe the stress–strain dependence for different deformation rates. The model of filament buckling expl…
This review summarizes the biological profile of the nonionic contrast medium, iohexol, with particular emphasis on neurovascular and myelographic applications. Iohexol was compared with conventional ionic media and with newer nonionic agents in a variety of animal models. Studies of systemic toxicity (teratogenicity,…
The crystal structure of danburite has been studied at high temperatures up to 900°C based on single-crystal diffraction intensities collected on a four-circle diffractometer. The thermal response of the structure is basically characterized by an unusual expansion of a specific bond, B – O(2b), of the borate tetrahedr…
The displacement velocity of each crystalline face of aspirin on dissolution in distilled water was determined by using large single crystals grown from ethanolic solution. It was found that each crystalline face of aspirin has its own displacement velocity. The specific surface energies for those crystalline surfaces…