Materials Literature
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Abstract Clay fractions in soils from a transect of the Mazama ash deposit (6600-yr-old) contained more than 80% amorphous material. Instrumental neutron activation analysis was used to compare the trace element composition of the soil clay with the unweathered volcanic glass. The clay fractions had only 10% as much N…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolar Tautomer Dimerization of Ionic Arylazonaphthols in WaterAlan Monahan, Allen DeLuca, and Anthony WardCite this: J. Org. Chem. 1971, 36, 24, 3838–3842Publication Date (Print):December 1, 1971Publication History Published online23 December 2002Published inissue 1 December…
Abstract A variety of stevensite was collected at the Obori mine, Yamagata Prefecture, Japan. Analysis shows close agreement with published data for stevensite. Chemical composition: SiO 2 52·76%; A1203 trace; Fe203 0·38%; MgO 23·67%; MnO 1·57%; CaO 2·19%; Na 2 O 0·37%; K 2 O 0·00%; H 2 O + 6·52%; H 2 O − 12·38%; Tota…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectron transfer in the type II photoelimination of .alpha.-aminoacetophenonesAlbert Padwa, William Eisenhardt, Robert Gruber, and Deran PashayanCite this: J. Am. Chem. Soc. 1971, 93, 25, 6998–7005Publication Date (Print):December 1, 1971Publication History Published online…
Abstract The radiation‐induced copolymerization of chlorotrifluoroethylene with ethyl vinyl ether was investigated in the liquid phase at 20 and −78°C over a wide range of monomer compositions. A copolymer was obtained in which the monomers alternate with regularity along the polymer chain over the entire range of mon…
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…