Materials Literature
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The concept of a critical potential below which pitting of 18–8 and other passive alloys does not occur in aqueous Cl − media is affirmed. Increasing Cl − concentration shifts the critical potential to more active values. The potential is shifted to more noble values by presence of other anions, e.g. , ClO 4 − , SO 4…
The effects of eddy currents in transformer windings are considered, and a method is derived for calculating the variation of winding resistance and leakage inductance with frequency for transformers with single-layer, multilayer and sectionalised windings. The method consists in dividing the winding into portions, ca…
Several aspects of the mechanical properties of polymers are discussed. These include linear and non-linear viscoelastic behaviour, anisotropy, rubber-like elasticity, breaking and cold drawing.
Abstract The α‐dispersion in many polymer systems is the process to be associated with the glass transition temperature where many physical properties undergo drastic changes. We have measured and analyzed the complex dielectric behavior of the α‐dispersions for five polymers [i.e., polycarbonate and polyisophthalate…
Received 28 October 1965DOI:https://doi.org/10.1103/PhysRevLett.15.958©1965 American Physical Society
Quantum yields for pyridoxal, pyridoxamine, and pyridoxamine-5-phosphate at 25 degrees C in neutral aqueous solution were 0.048, 0.11, and 0.14, respectively. The fluorescence efficiencies were highly temperaturedependent, and the compounds were extremely sensitive to light. There were marked discrepancies between the…
The dissolution of a natural kaolinite in water systems at 25°C having a pH between 3.2 and 4.0 was monitored for 2 years by periodically measuring pH and aluminum and silica concentrations. On the basis of a wet chemical analysis and X-ray diffraction patterns of the kaolinite and on the rate of solution of aluminum…
The dielectric properties of undiluted liquid atactic polypropyleneoxide have been studied as functions of temperature and molecular weight. The principal dispersion occurs at essentially the same frequency for all molecular weights at a given temperature, but at ower frequencies there is a small secondary loss peak t…
An exothermic reaction, proceeding in a reaction mass, may give an explosion or thermal equilibria depending upon the magnitude of the number δ. Frank-Kamenetsky's original criterion for thermal explosion is δ>3.32. Extended calculations have shown that a more detailed consideration of the situation is possible…
Abstract The thermal conductivities of eight lithium fluoride crystals with 6Li contents ranging from 0-01 to 90 % have been measured between 1 and 300 °K. We can explain the low-temperature results very satisfactorily by Callaway’s relaxation-time theory. The calculated phonon scattering by isotopes has been used thr…
The lattice thermal conductivity of GaAs and InSb has been calculated in the temperature range 2-300\ifmmode^\circ\else\textdegree\fi{}K taking into consideration the details of phonon dispersion relations resulting in the separate contributions of the longitudinal and transverse phonons. This analysis gives a much be…
We have measured the temperature dependence and the angular anisotropy of the spin-lattice relaxation rate $\frac{1}{{T}_{1}}$ of cerium, praseodymium, neodymium, samarium, terbium, and erbium in single crystals of anhydrous lanthanum trichloride. The experiments were performed at $X$-band frequencies using pulse-satu…
The thermal resistivity $w$ contributed to Ge at low temperatures by electrically active impurities has been investigated by measurements on a series of single crystals ($n$-type) between 1.3 and 150\ifmmode^\circ\else\textdegree\fi{}K. By comparing compensated [(Sb+Ga)-doped] with noncompensated (Sb- or As-doped) sam…
The lattice thermal conductivity for monatomic crystals is discussed for high temperatures, above and around the Debye temperature. While this problem cannot be treated in a suitable way by conventional methods for calculating transport coefficients, it represents an excellent example of the use of correlation-functio…
The exponential absorption edge of GaAs may be interpreted as reflecting the presence of tails of states extending both intrinsic bands into the energy gap. The distribution of these tail states seems exponential, varying with energy as $\mathrm{exp}(\frac{E}{{E}_{0}})$ where ${E}_{0}$ increases with doping. ${E}_{0}$…
Abstract Nachdem es feststand, daß es drei Typen kondensierter anorganischer Phosphate — Metaphosphate, Polyphosphate und vernetzte Phosphate — gibt, wurde versucht, ihre Bildungswege und gegenseitigen Beziehungen aufzuklären und ihre bemerkenswerten Eigenschaften verständlich zu machen. — Meta‐ und Polyphosphate mit…
Molecular fragmentation of organic liquids was produced by cavitation due to ultrasound waves, even in the absence of water. The sonolysis of acetonitrile under argon yielded N(2), CH(4), and H(2); but under oxygen the products were N(2), CO, CO(2), and H(2)O. Pure nonaqueous carbon tetrachloride also underwent sonoly…
The distribution of fission fragments recoiled from a thick layer of uranium oxide into aluminum was measured with the application of an anodizing technique to strip layers from aluminum. Details of the procedure are described. The distribution thus determined gave the recoil ranges of the fission fragments: They were…
The coefticient K (Huberty) has been introduced to obtain a characterization of the irregularity of yarns, which depends only on the structure of the distribution of the fiber endpoints along the axis of the yarn and not on the length L and cross section Q of the fibers, and also not on the expected number of fiher en…
Some ferroelectric materials exhibit a transition from stable to unstable partial switching at a critical pulsewidth t*. Schemes are proposed for utilizing this t* effect for coincident and successive addressing of a matrix memory, for a nondestructive readout from a matrix and for the simplification of a ferroelectri…