Materials Literature
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The x-ray photoelectron spectra of the oxygen 1s level of olivines contain a single component whereas those of pyroxenes contain two components with an intensity ratio of 2:1 and an energy separation of about 1 electron volt. We interpret these two components to be the result of the binding energy differences between…
Craters produced by, missiles with oblique trajectories and kinetic energies between 2.1×1014 and 81×1014 ergs produce craters 2 to 10 meters across. The craters and their ejecta are typically bilaterally symmetrical about the plane of the trajectory. Crater dimensions are strongly dependent on target material and kin…
The changes in refractive index caused by shock compression have been determined for tektite, soda-lime, and silica glasses shocked to pressures up to 460 kb. For shock compression below 80 kb for fused silica and 40 kb for tektite and soda-lime glasses, compression is reversible as the refractive indices are within 0…
Spherulites are clusters of confocally radiating crystals that, contrary to the implication of their name, are not commonly spherical but usually resemble sheaves of wheat tied at the center. The variation of morphology from the wheat sheaf to the spherical spherulite and the transition of growth conditions from the s…
Chemically activated electroadhesive pads on spacecraft surface, allowing astronauts to maneuver or work in zero gravity environments
Abstract The growth of crystals of calf rennin (chymosin, † EC 3.4.4.3) and the control of nucleation to produce crystals of desired size, are described. Only one stable species, orthorhombic rennin I, has been found, but a metastable monoclinic species, rennin II, appeared on one occasion in a solution nearly saturat…
One of the precesses which may be observed in ${e}^{\ifmmode\pm\else\textpm\fi{}}{e}^{\ensuremath{-}}$ colliding-beam experiments is the deep inelastic electron-photon scattering. We examine the feasibility of such an experiment assuming an appropriate scaling limit.
The energy loss of 5-eV electrons reflected from clean and from oxidized (111) silicon surfaces has been investigated. A surface phonon with $\ensuremath{\hbar}\ensuremath{\omega}\ensuremath{\approx}55$ meV, $k\ensuremath{\approx}0$ is found at the clean surface. After exposure to \ensuremath{\cong}${10}^{\ensuremath{…
Abstract A direct electrochemical preparation of polybutadiene to a predetermined molecular weight distribution has been achieved. Butadiene is a good model compound, inasmuch as the rate of electrochemical initiation is high relative to the rate of propagation. Rate constants for the temperature interval of interest…
Meaningful high resolution microscope of specimens that are sensitive to radiation damage is limited in resolution by considerations of statistics and contrast in the image. The product of contrast, C, and resolution, d, must satisfy the inequality where S/n is the minimum acceptable ratio of real contrast to statisti…
Kritische Betrachtung der verschiedenen in Anwendung stehenden Bildreihen zur Ermittlung des Gehaltes an mikroskopischen nichtmetallischen Einschlüssen in Stahl. Forderungen an eine allgemein anwendbare Bildreihentafel. Darstellung einer neuen Bildreihentafel und Beschreibung ihres systematischen Aufbaues nach Art, Fo…
Abstract The asymmetric oxidation of poly(phenylvinyl sulfide) (poly‐Ph VS) and poly( t ‐butylvinyl sulfide) (poly‐ t ‐BuVS) was carried out with optically active percamphoric acid, and the optically active polysulfoxides were obtained. The values of the specific rotation for the oxidation products of poly‐PhVS and po…
Abstract The use of combined modes of thermal analysis by differential thermal analysis (DTA), thermomechanical analysis, and thermal depolarization analysis (TDA) presents a more illustrative picture of the phase transitions and behavior of the allotropes of sulfur. Volumetric changes suggest the T g of polymeric sul…
Diamagnetic susceptibilities and anisotropies of metal-free, nickel(II), and zinc(II) phthalocyanines are reported. Calculations based on Pauling's semiclassical model give very poor agreement with the experimental results. The results are interpreted following the procedure of Amos and Roberts from which it emerges t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRaman spectral study of bisulfate-sulfate systems. III. Salt effectsD. E. Irish and H. ChenCite this: J. Phys. Chem. 1971, 75, 17, 2681–2684Publication Date (Print):August 1, 1971Publication History Published online1 May 2002Published inissue 1 August 1971https://pubs.acs.or…
Abstract A series of ferrocene‐containing polymeric azines and polymeric Schiff bases have been synthesized by means of acid‐catalyzed solution polycondensations. The molecular structures of the polymers synthesized have been determined, and information concerning their thermal behavior has been obtained. Comparative…
Abstract The thermal decomposition of CaHPO 4 and CaHPO 4 .2H 2 O was studied by thermogravimetric analysis, X‐ray powder diffraction, and infra‐red spectroscopy. At 105°c, two moles of CaHPO 4 .2H 2 O combine and eliminate 1 mole of H 2 O. The remaining three moles of hydration water are eliminated at 165°c. Decompos…
Measurement of the molar enthalpies of mixing of molten nickel-copper alloys by means of a high-temperature calorimeter at 1480 °C immediately during the mixing of the two liquid components. Check of the fusion equilibria of the system nickel-copper and indication of new values for the solidus line. Determination of t…
Abstract Application of the Arrhenius relationship for temperature and ratio of isomeric units in polybutadiene made in the presence of butyllithium initiator is consistent with the existence of three simultaneous competing reactions. Evidence in the literature is cited to support the possibility that the growing chai…
The low-frequency linear electrooptic coefficient r 41 T in semi-insulating ZnTe is measured at 10.6 µm at room temperature. The measured value is (3.9±0.2)×10 -12 m/V, which is only slightly smaller than that in the visible region. This result seems consistent with a lattice theory on the dispersion of r 41 T in crys…