Materials Literature
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The thermal decomposition reactions of prepared FeOCl and natural marine cast iron corrosion products in inert, oxidizing and reducing atmospheres were determined for temperatures up to 1000°C. The results were used to discuss thermal stabilization treatment of marine iron. Pure dry hydrogen was shown to be the best a…
Abstract The incorporation of a rubber phase in glassy polymers, as is well known in the case of high impact polystyrene, leads‐to an increase in their impact strength. Block polymers offer three principal approaches for obtaining multiphase glassy polymers in which an elastorner phase is present in the matrix of the…
The pressure-temperature phase diagram of (NH 4 ) 3 H(SO 4 ) 2 was studied by means of dielectric and differential thermal analysis measurements in a range of \(p{\lesssim}8.5\) kbar, –100°C \({\lesssim}T{\lesssim}\)150°C. The I-II transition point (140°C at 1 atm) linearly decreases with increasing hydrostatic pressu…
The theory of space-charge-limited current (SCLC) flow in insulators has been extended to include the case of materials with two sets of traps. By using the regional approximation method, two theoretical current-voltage characteristics have been derived for this situation, referring to different starting positions of…
Gradient-index ray-tracing techniques are used to evaluate performance of inhomogeneous optical waveguide lenses. Using the thin-film waveguide parameters including the lens thickness profile, the phase error and diffraction pattern are derived. The procedure is applied to a classical Luneburg index profile for which…
Forty fine-wool Merinos grazed sown pastures and 40 grazed on weedy unimproved areas for 2 years. The sheep were dyebanded at intervals, and the weight of wool lost from the fleece tip was estimated from sequentially harvested sets of staples. Half the sheep in each group were fitted with woven polyethylene coats. In…
Abstract The heat capacities of (NH4)3[FeF6] crystal have been measured from 15 to 350 K with an adiabatic calorimeter. A heat capacity anomaly was observed at 267.02±0.05 K. The enthalpy and entropy changes of the transition are 6490±500 J mol−1 and 24.8±1.9 J K−1 mol−1, respectively. This value of entropy was discus…
Abstract In order to study the influence of chemical modification on properties of polyamides, wholly aromatic polyamides have been synthesized from p ‐phenylenediamine, its 2,5‐dimethyl and 2‐methyl derivatives, m ‐phenylenediamine, its 2‐methyl and 4‐methyl derivatives, and terephthaloyl and isophthaloyl dichlorides…
Oxide films have been formed on nickel by either electropolishing in or anodizing at different potentials and times in p H 2.8 . The 6–8Å film of on electropolished nickel breaks down rapidly on open circuit at p H 2.8 with a poorly defined potential arrest structure. In contrast, several distinct potential arrests ar…
A cellulolytic bacterium, identified as belonging to the genus Cellulomonas, produced two classes of cellulases when grown in the presence of cellulose. One class comprised enzymes which were tightly bound to cellulose, and the other, enzymes which were found free in the culture supernatant fluid. The cellulose-bound…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of hydrogen absorption by lanthanum-nickel (LaNi5)S. Tanaka, J. D. Clewley, and Ted B. FlanaganCite this: J. Phys. Chem. 1977, 81, 17, 1684–1688Publication Date (Print):August 1, 1977Publication History Published online1 May 2002Published inissue 1 August 1977https:…
The chemical constitution of the passive oxide films formed on aluminum in chromate and chromate/chloride solutions under simple immersion (at open‐circuit potential) and under anodic polarization has been investigated by means of x‐ray photoelectron spectroscopy. It has been shown that these films, whose thickness is…
Abstract The complex dielectric constant ϵ of thick Cu and Ag films on fused quartz substrates is determined at 300 and 1.5 K by a modified v. Fragstein‐Kampermann method in the spectral region between 0.41 and 0.71 m̈n. The relaxation frequency of the conduction electrons is determined and the contributions of electr…
SUMMARY Considerable strides have been made in the application of the cathodoluminescent and beam‐induced current modes of operation of the scanning electron microscope to the high resolution characterization of semiconductor materials. These techniques can be used to measure parameters such as resistivity, carrier co…
The intensity of the X-ray diffuse scattering from an electron-phonon system is calculated correct up to the second order of the electron-phonon interaction. The result consists of two terms: one is described as arising from softening of the phonon frequency due to the interaction, and the other as the shift of the ce…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectron spin resonance spectra and spin-Hamiltonian parameters for trigonal-bipyramidal nickel(I) and copper(II) complexesRolando. Barbucci, Alessandro. Bencini, and Dante. GatteschiCite this: Inorg. Chem. 1977, 16, 8, 2117–2120Publication Date (Print):August 1, 1977Publica…
Abstract Dynamic viscosity and elastic modulus for a low molecular weight styrene‐butadiene‐styrene (SBS) block copolymer ate measured as a function of temperature (80‐170°C) and frequency using the eccentric rotating disc geometry. These linear properties are superimposed to yield master curves each of which exhibits…
It was recently suggested that the electron affinity may pose an additional upper limit on the charge of a single particle in a plasma, in addition to the electron field emission limit. Here we will, however, show that these two limits both rely on the same physical process and that the limit is only relevant for smal…
Two independent isolates of Saccharomyces cerevisiae lacking hexokinase activity (EC 2.7.1.1) are described. Both mutant strains grow on glucose but are unable to grow on fructose, and contain two mutant genes hxk1 and hxk2 each. The mutations are recessive and noncomplementing. Genetic analysis suggests that these tw…
A strong temperature dependence has been observed for the first time in angle-resolved photoemission (ARP) spectra of the valence band of a crystalline solid. This spectral behavior confirms predictions of a model suggested by Shevchik. A controversial point in the interpretation of ARP spectra at x-ray energies is re…