Materials Literature
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The depolarization ratios of the Raman vibrational bands from the terminal C≡N and the central C–C biphenyl link of an oriented nematic liquid crystal [p-n-pentyl-p′-cyanobiphenyl (5CB)] have been measured. The orientational order parameters 〈P2〉 and 〈P4〉 were calculated. The parameter 〈P4〉 remained far less than the…
Certain properties of vacuum-deposited thin films of a-Se were measured and compared with those of melt-quenched Se glass. After annealing in the temperature range 25–50 °C, the creep, heat capacities, and far-infrared behaviors of the vapor-deposited films were indistinguishable from those of melt-quenched specimens.…
Abstract In gamma-ray logging for radioactive source material, the logging system response depends on a variety of internal and external influences, such as the type of material, disequilibrium, source geometry, logging medium, and system components. Of paramount importance is the constant of proportionality that rela…
ABSTRACT Thirteen genera of algae were collected and identified from 110 swimming pools in the metropolitan area of Phoenix, Arizona. They included seven cyanophytes (Calothrix, Lyngbya, Oscillatoria, Nostoc, Phormidium, Plectonema, Pleurocapsa), four chlorophytes (Chlamydomonas, Diogenes, Oocystis, Roya), and two chr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMetal tetrathiolenes. 3. Structural study of the first bimetallic tetrathiolene complex, tetrakis(triphenylphosphine)diplatinum tetrathionapthalene, (Ph3P)4Pt2(C10H4S4) revealing an unexpected molecular distortionBoon-Keng Teo and P. A. Snyder-RobinsonCite this: Inorg. Chem.…
It has been demonstrated that the natural atmospheric corrosion behavior of low alloy steels in marine environments can be accurately described by an equation of the form: ∆W = KtN. With this relationship, reliable predictions of long term weight losses can be made from as few as two sets of determinations obtained in…
Abstract The polymers of lithium, sodium, potassium, and caesium salts of methacrylic acid have been prepared by free radical polymerization of the respective monomers in methanol solution. The degradation behavior of the polymers has been investigated by thermal volatilization analysis, thermogravimetry, and product…
Abstract A technique suitable for computer application has been developed whereby whole rock major element analyses are corrected for X-ray detectable nonclay minerals and used to set up simultaneous equations which are solved to give clay mineral abundances. A theoretical evaluation of the approach by graphical metho…
Gas-gun impact techniques have been used to pulse charge nanofarad capacitors from the shock depoling of PZT 56/44 and PZT 95/5 ferroelectric ceramics. The PZT materials were depoled in the normal mode. Pulse powers of hundreds of kilowatts were produced in a few microseconds. The PZT 56/44 material was impacted in th…
The characteristic pitting potentials of Ti and Ti6Al4V were determined by measurement of potentiodynamic current-potential curves in solutions of 1N NaCl, 1N Nal, and 1N NaBr. Under the same conditions current-time curves were measured for various potentials after generation of a new metallic surface. By means of the…
Air travel is becoming increasingly more accessible to people both\nthrough the availability of low cost flights. Health problems may arise due to anxiety\nand unfamiliarity with airport departure procedures prior to flying, whilst\nduring the air travel, problems may arise as a result of the food served on board,\ndi…
Abstract Besides the well-known argyrodite (Ag 8 GeS 6 ), the new compound Ag 2 GeS 3 could be synthesized from Ag 2 S-GeS 2 mixtures. Ag 2 GeS 3 crystallizes in an orthorhombic variant of the Wurtzite structure. Treatment of Ag 2 GeS 3 in a AgI/AgCl-eutectic yields the quaternary compound Ag 7 GeS 5 I. Crystal data f…
Heating experiments on natural omphacite at 15 to 18 kbar, using a piston-cylinder solid-media apparatus, have established the critical temperature for the order-disorder P2/n = C2/c transition at 725 plus or minus 20 degrees C. The disordering reaction P2/n-C2/c is quite abrupt, and the observed transformation temper…
The corrosion growth kinetics for Cu, Ni, and Ag in an air‐conditioned telephone office and a nonair‐conditioned telephone office basement have been obtained by measuring the film thicknesses on coupons exposed for various times. The film constituents and thicknesses on these materials were obtained by AES and cathodi…
At certain wavelengths, depending on the thickness of a thin transparent dielectric layer on an absorbing substrate, a standing-wave condition can be produced that efficiently couples the S wave to the substrate, simulating a cavity resonance in the dielectric and maximizing the complex reflectance ratio. Under these…
Abstract From the general formalism of elastic x‐ray scattering and a few meaningful assumptions we have shown that for an atom, ∫ρ 2 d τ is an experimentally measurable quantity related to the intensity scattered by an element. We have labeled this quantity ( p ), the “average electron density.” If ψ obeys the virial…
Viscosity and thermal expansion have been measured for 12 series of lithium aluminosilicate glasses. The compositional dependency of the viscosity, glass-transformation temperature, dilatometric-softening temperature, and refractive index all exhibit an abrupt change in slope at an aluminum-to-lithium ratio between 1.…
The anodic behavior of copper in lithium hydroxide solution was investigated at room temperature under controlled potential conditions. The electrodes were either saturated copper amalgams or small polycrystalline wires. Particular attention was focused on the copper (I) region. Two layer‐planes of Cu 2 O were formed…
The nacreous layer in Gibbula, Calliostoma, Trochus and Haliotis is described on the basis of scanning electron microscopic studies. The central part of each nacreous tablet contains a significant amount of calcified organic matrix which is insoluble in a chromium sulphate and a 25% glutaraldehyde solution. In most ca…
Abstract Nonempirical LCAO MO SCF computations (in the ΔSCF formalism) have been carried out of binding energies and relaxation energies for an extensive series of oxygen‐containing organic systems encompassing most of the common functionalities. The molecules for which experimental data are available for comparison d…