Materials Literature
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Abstract In den letzten Jahren sind zahlreiche Ringgerüste mit einer Dreifachbindung studiert worden, so Cycloalkine, Heterocyclen mit Dreifachbindung und speziell das Dehydrobenzol. Bislang ist es noch nicht gelungen, das Dehydrobenzol in Substanz zu fassen; die Möglichkeiten dazu werden dargelegt.
The dynamical behavior of uniformly moving dislocations in anisotropic media is considered for the general case in which the dislocation involves three components of displacement. It is found that both edge and screw dislocations can display an anomalous behavior. It appears that, in general, the force of interaction…
The matrix isolation technique has been extended to allow molecules which are in equilibrium with solids at high temperatures to be trapped and studied at low temperatures. A beam of the hot vapor issuing from a Knudsen cell or a heated surface is premixed with a large excess of argon or xenon just prior to condensati…
The symmetry properties of wave functions in magnetic crystals are discussed in terms of the irreducible representations of magnetic space groups. The specific effects of the magnetic ordering on the crystal eigenstates are found to be of three types: (1) There is a lifting of some eigenfunction degeneracies because t…
The atomic configurations and energies for point defects in copper have been studied theoretically using a classical model. The atoms near the defect are treated explicitly while the remainder of the crystal is treated as an elastic continuum with atoms imbedded in it. A Born-Mayer repulsive force law, $A{e}^{\ensurem…
A microscopic theory of phonon-magnon interaction in magnetic crystals is developed from first principles. The crystal field oscillations are treated as perturbations which superpose some excited orbital states on the ground orbital state of the magnetic ions. When use is made of these perturbed states as the starting…
A solution has been found for the rate of growth of crystal whiskers from the vapor when nucleation on the whisker surfaces does not occur. Expressions have also been derived relating the supersaturation ratio of adsorbed atoms along the whisker to the total length from which certain predictions can be made concerning…
The changes in residual electrical resistance produced by bombardment with high-energy electrons were measured for a number of metals as a function of electron energy in the range from 0.5 to 1.4 MeV. The irradiations were performed at \ensuremath{\lesssim}20\ifmmode^\circ\else\textdegree\fi{}K, and recovery measureme…
The study of a two-dimensional system consisting of 870 hard-disk particles in the phase-transition region has shown that the isotherm has a van der Waals-like loop. The density change across the transition is about 4% and the corresponding entropy change is small.
An investigation was made of the temperature and frequency dependence of T2 for O17 in aqueous solutions containing Mn2+, Fe2+, Co2+, Ni2+, and Cu2+. This represented an extension of the studies previously performed in this laboratory on these ions. Virtually all of the temperature effects predicted by the modified Bl…
The crystal structure of Pdl~Se15, with which Rhl~S15 (formerly alleged to be RhgSs) is isostructural, has been determined from single crystal data.The crystal belongs to one of the three space groups O~-Pm3m, T~-P-43m or O1-P432 with a lattice constant of 10"606 A and two PdlTSe15 per unit cell.It is shown that the X…
CrBr~ crystallizes in a monoclinic ~mit cell, space group C2/m, with a0--7.11~, b0--3.649, c0=6.21 ~ A; fl=93 53'.
In this work the uncrimping force and energy are used to characterize the crimp of wool fibers. These parameters are measured through the load-extension curves of single wool fibers. It seemed necessary to investigate the stability of the uncrimping energy and force. This stability is referred to as crimp recovery. Th…
Abstract The observed spectra of water of crystallization were compared with those of aluminum chloride hexahydrate and interpreted on the basis of the effects of aluminum-water coördination and hydrogen bonding O–H…O. The wagging and the rocking frequency were both much higher than is usual in water of crystallizatio…
Manager, Health Operation, Hanford Atomic Products Operation, Richland, Wash., operated by General Electric Company for the Atomic Energy Commission
The Zeeman-split quadrupolar resonances of ${\mathrm{Ba}}^{137}$ and ${\mathrm{Ba}}^{135}$ in barium bromide dihydrate were observed by using coincident enhancement of proton magnetic resonance as a detector. It was found that $\frac{{Q}_{137}}{{Q}_{135}}$ is 1.543\ifmmode\pm\else\textpm\fi{}0.003 and that the asymmet…
The variation of torsional rigidity of wool fibers with relative humidity is investi gated by dynamic methods at frequencies ranging from 115 to 0.00028 cycles/sec. Measurements are reported of the equilibrium values at various humidities and of the kinetics of change of rigidity as the humidity is altered. It was fou…
Abstract Many of the outstanding physical properties that characterize elastomeric Polyurethans have been realized in a soluble, thermoplastic variety, Polyurethan VC, which displays the superficial properties of a rubbery vulcanizate at room temperature and so is considered to be virtually crosslinked. High tensile s…
It is shown that Chamber's kinetic integral is an exact solution of the Boltzmann equation in the relaxation time approximation.Received 13 April 1962DOI:https://doi.org/10.1103/PhysRev.127.4©1962 American Physical Society
Abstract An experimental study is described of a “secondary” relaxation process in stretched vulcanizates, which becomes dominant after long periods at normal temperatures. It is shown to be affected markedly by the temperature, the atmosphere in which the test is conducted, and the presence of oxidation inhibitors. I…