Surface Charge, Protein Adsorption, and Thrombosis
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Improved contrast uniformity in twisted nematic liquid-crystal electro-optic display devices
It has already been shown that one source of the patched appearance in twisted nematic displays is reverse twist; we now demonstrate the existence of another. Both types of patches have been eliminated by the use of cholesteric additives in combination with particular types of surface alignment.
Mechanical Properties of Cast Carbon Steel in Heavy Sections
An extensive investigation of the mechanical properties of cast ASTM A216 steel WCB and WCC grades, as functions of composition, heat treatment and casting thickness is reported. Castings in section thicknesses ranging from 2 1/2 in. to 10 in. were produced from twenty-two commercial size heats by five different found…
Enthalpy of formation of phosphorus pentachloride; derivation of the enthalpy of formation of aqueous orthophosphoric acid
When chlorine (real gas , 980 mmHg) combines with white (a) phosphorus to form phosphorus pentachloride at 24.89 C, 3986.32.7 J of heat are liberated per gram of stoichiometrically equivalent Mg,P,07. This value was determined by a dead-ended flow system in an electrically calibrated isoperibol calorimeter. Correction…
Dependence of the Polymer-Solvent Interaction Parameter of Vulcanizates Based on Cis-1,4-Poly(Butadiene) on the Type and Concentration of Vulcanizing Agent
Abstract Values of the polymer-solvent interaction parameter were obtained for cis -1,4-poly(butadiene) vulcanized with alkylphenol—formaldehyde oligomer, sulfur, and peroxide systems swollen with heptane, benzene, and m -xylene. The dependence of the interaction parameter on the degree of crosslinking was demonstrate…
C. - AMORPHOUS METALLIC SYSTEMS.TEMPERATURE DEPENDENCE OF THE ELECTRICAL RESISTIVITY OF AMORPHOUS Ge, Sn AND Bi ALLOYS AND ITS RELATION TO SUPERCONDUCTIVITY
The amorphous alloys are quench-condensed from the vapour phase on a substrate at 4 K. The electrical resistivity of amorphous Ge + 41 at. % Au, Bi + 15 at. % Ag and Sn + x at. % Cu (x = 10 to 80) is measured. An unusual linear temperature dependence is found with negative dope for Ge, Bi and Sn alloys and with a posi…
The influence of crystallinity on the beta‐transition in poly(vinyl chloride)
Abstract The effect of changes in crystallinity on the β‐transition in poly(vinyl chloride) was studied by dynamic mechanical measurements of loss tangent (tan δ) and storage modulus ( E ′) over the temperature range −160° to 85°C. Four frequencies were covered, 3.5, 11, 35, and 110 Hz. The data presented demonstrate…
The Self‐Association of Chymotrypsinogen A
The self‐association of chymotrypsinogen A at pH 8.1 and at ionic strength of 0.021 has been examined by means of sedimentation equilibrium. The data have been analyzed by several methods and results compared. Application of the older methods available in the literature indicate that the concentration dependence of mo…
Determination of young's modulus of elastomers by use of a thermomechanical analyzer
This work used a conventional thermomechanical analyzer (TMA) to measure the depth of indentation at room temperature of elastomers and Finkin's equation to calculate Young's moduli of elastomers, which have been measured by Drutowski, from the radius of contact of an indentor on thin sheets of sample. Data obtained f…
The crystal structure of brazilianite, NaAl3(PO4)2(OH)4
The mineral brazilianite, NaAI3(PO4)2(OH)4, is monoclinic, space group P21/n, with a = 11.233 (6), b = 10142 (5), c=7-097 (4) ,& and fl=97.37 (2) A~. With Z = 4 the calculated density, 2.998 (4), compares well with the measured density, 2.98 (1) gcm -3. The structure was solved by direct phasing and Fourier techniques…
Three-anode accelerating lens system for the field emission scanning electron microscope
The characteristics of an accelerating lens system composed of three anodes in the scanning electron microscope are described. The main advantages of this accelerating lens system are that the working distance can be changed freely or the accelerating voltage can be changed over a wide range (about 0.3–100 kV) without…
Anionic polymerization of a series of five‐membered cyclocarbosiloxanes
Abstract A study was conducted of the anionic polymerization of a series of methyl‐ and/or phenyl‐substituted five‐membered cyclocarbosiloxanes. The polymerization was initiated by lithium n ‐butyldiphenylsilanolate in the presence of tetrahydrofuran. The rate of conversion of monomer to polymer was measured in an NMR…
Soft-mode dynamics in nematic liquid crystals
The dynamic properties of the molecular model proposed by Maier-Saupe (MS) for nematic liquid crystals are investigated. It is shown that the model predicts diffusive optic soft modes, describing nematic-order-parameter fluctuations which condense at the isotropicnematic stability limit. Since the MS Hamiltonian in it…
Thickness of 90° ferroelectric domain walls in (Ba,Pb)TiO3 single crystals
90° ferroelectric domain boundaries were observed by direct transmission electron microscopy in single crystals of pure BaTiO3 and (Ba,Pb)TiO3 solid solutions. Domain-wall thickness measurements were made from electron image plates by a densitometer-trace-curve-fitting technique. Boundary widths varied from 50 to 150…
CRYSTAL SYSTEMS AND LATTICE CONSTANTS OF PEROVSKITE-TYPE COMPOUNDS BaThO3 AND Ba2(BaU)O6
Abstract BaThO3 had an orthorhombic lattice (a=6.345Å, b=6.376Å, c=8.992Å) with four pseudomonoclinic perovskite units(a′=c′=4.498Å, b′=4.496Å, β=90°17′). Ba2(BaU)O6 was a tetragonal, ordered perovskite(a=b=6.286Å, c=8.972Å). Ahrens′ radius of octahedral Ba2+ in Ba2(BaU)O6 was evaluated to be 1.16Å via a lattice param…
The electronic absorption and magnetic circular dichroism spectra of the hexaquochromium(III) ion
The absorption and magnetic circular dichroism (MCD) spectra of a single crystal of [K(H2O)6][Al(Cr)(H2O)6](SO4)2, with an aluminium : chromium ratio of approximately 10 : 1, have been measured in the range 14 500–33 000 cm-1 at various temperatures between 5 and 300 K. An analysis of the temperature dependence of the…
Helium, deuterium, and neon migration in a common borosilicate glass
Helium, deuterium, and neon permeability, diffusivity, and solubility have been measured for CGW-7740 glass. The results indicate that gas migration occurs primarily through the silica-rich phase. Reaction of deuterium with the glass structure is evident at temperatures exceeding 300°C. The activation energy associate…
Pseudopotential calculations on the optical properties of palladium
An improved band structure of Pd calculated by the empirical pseudopotential method is used to compute the density of states and the reflectivity, R( omega ). The reflectivity of Pd with dipole matrix elements calculated by the actual wave functions is given for 0<or=h(cross) omega <or=10eV and is compared with measur…
Use of Infinite-Dilution Activity Coefficients for Predicting Azeotrope Formation at Constant Temperature and Partial Miscibility in Binary Liquid Mixtures
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUse of Infinite-Dilution Activity Coefficients for Predicting Azeotrope Formation at Constant Temperature and Partial Miscibility in Binary Liquid MixturesVincenzo BrandaniCite this: Ind. Eng. Chem. Fundamen. 1974, 13, 2, 154–156Publication Date (Print):May 1, 1974Publicatio…
Natural Pollution Test of Insulators Energized with DC High Voltage
Various types of insulators have been energized with ±250 kV dc voltage and exposed to natural conditions by the seaside continuously. Salt deposit density and flashover phenomenon of these insulators have been investigated extensively for about two years. According to the results obtained so far, the influence of dc…