Materials Literature
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In impact-produced spall fracture, a material undergoes drastic dynamic precompression immediately prior to the time of fracture. In this paper a technique is described for varying the precompression stress wave magnitude σc relative to the magnitude σr of the rarefaction wave, which produces the spall, in the range o…
Abstract— Three different types of photomotion reactions, photokinesis, photo‐topotaxis and photo‐phobotaxis, have been investigated in the diatom Nitzschia communis . In photokinesis the active light appears to be absorbed by the photosynthetic pigments. Apparently, the acceleration of movement by light is due to an…
The anisotropic threshold energy for atomic displacements and the displacement cascade process in electron-irradiated pyrolytic graphite are studied in the energy range from 0.12 to 1.0 MeV at three different temperatures by observing the a -axis electrical resistivity increases. The threshold energy T d is represente…
Plate-impact experiments and shock-wave propagation in isotropic materials have become a standard technique for the study of material properties at very high strain rates. Recent work has also included shock propagation in anisotropic materials for specific wave-propagation directions in which pure longitudinal motion…
"Dynamics of Nuclear Reactors." Nuclear Technology, 12(4), p. 415 Additional informationNotes on contributorsM. A. SchultzM. A. Schultz (BS, electrical engineering, MIT, 1939) is presently a professor of nuclear engineering at The Pennsylvania State University, after 30 years of industrial experience, 20 of which were…
Abstract Vermiculite, mixed-layer vermiculite-phlogopite, and smectite are presently forming from igneous and metamorphic bedrock in the alpine zone of the northern Cascades, Washington. In addition, south-facing exposures of quartz-diorites and metadiorites above snow line are weathering to ferruginous bauxite. Calcu…
Permanent erasable holographic storage has been demonstrated in a VO2 film by utilizing a change in an optical property which has a broad hysteresis at the insulator-to-metal phase transition. The implied coexistence of insulating and metallic phases at a single temperature indicates that a barrier exists which inhibi…
Abstract The various nuclear magnetic resonance techniques used for determining self‐diffusion coefficients and activation energies in aluminium are evaluated critically. The data considered most reliable are analyzed together with the Al 26 ‐tracer measurements of self‐diffusion. From the temperature and the pressure…
The nuclear quadrupole coupling constants and isomer shifts of 57Fe in the spinels ZnFe2O4 and CdFe2O4 were measured using the Mössbauer effect. The signs of the quadrupole coupling constants were determined from spectra which were taken in an applied magnetic field. The sign is negative in both spinels. The isomer sh…
It is shown that the strain field of a straight dislocation in an anisotropic elastic continuum includes an infinite series of terms of order 2 and higher in inverse distance from the dislocation line. These terms are determined by the nature of the core. A method is developed of finding these terms for a given disloc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structure of tellurium tetrachlorideBruno Buss and Bernt KrebsCite this: Inorg. Chem. 1971, 10, 12, 2795–2800Publication Date (Print):December 1, 1971Publication History Published online1 May 2002Published inissue 1 December 1971https://pubs.acs.org/doi/10.1021/ic501…
Molecular-beam epitaxy has been used successfully for the attainment of single-crystal multiple-layer structures with alternating types of conductivities (p/n) or band-gap energies (GaAs/AlxGa1−xAs). Deposition by the molecular-beam method offers the possibility of growing periodic-structure layers with constant chemi…
Fracture energy and strength were determined for three series within a sodium borosilicate glass‐Al 2 O 3 dispersed composite system. The average particle sizes of the Al 2 O 3 dispersions were , and μm. Within each series, composites containing 0.10, 0.25, and 0.40 vol fractions of the Al 2 O 3 dispersed phase were v…
Examines the many fundamental chemical principles involved in the production of polyurethanes, including hydrogen bonding, polymers and their properties, kinetics, steric and inductive effects, catalysis, consecutive and simultaneous reactions, and equilibrium.
There has been confusion for many years over the origin of the $\frac{a}{H}$ term in the expression for the approach to saturation, $\frac{M}{{M}_{s}}=1\ensuremath{-}\frac{a}{H}\ensuremath{-}\frac{b}{{H}^{2}}+cH$, observed in many ferromagnetic materials. A calculation is presented which suggests that residual interna…
A simple method to correlate dislocations observed in X-ray topographs with etch pits is described and has been applied to the case of cyclotrimethylene trinitramine crystals grown from solution by slow cooling.
Measurements of dielectric properties, pyroelectricity, and the electron paramagnetic resonance spectrum of Gd3+ as a function of temperature have been used to examine the phase transitions in CsPbCl3. The results indicate the presence of five phase transitions and the loss of a center of symmetry at 194 K. The result…
Yavapaiite [KFe(SO+):l crystallizes in space group C2/m with two formula weights in a unit cell of dimensions a:8.152, b:5.153, c:7.877 A, B:O+.Of . The structure was solved by a three-dimensional Patterson synthesis and refined by the frill-matrix leastsquares method to R:3.27o. Goldichite [KFe(SOr)z.4HzO] in space g…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTransition probabilities of europium in phosphate glassesR. Reisfeld, R. A. Velapoldi, L. Boehm, and M. Ish-ShalomCite this: J. Phys. Chem. 1971, 75, 26, 3980–3983Publication Date (Print):December 1, 1971Publication History Published online1 May 2002Published inissue 1 Decem…
A computer model was used to calculate the shape and average velocity v of a dislocation acted on by a viscous drag, and moving through a field of point obstacles. As a special case, the operation of a Frank-Read source was computed also. At sufficiently low velocities (and stress levels), the behavior is governed ent…