Materials Literature
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The hydroxyproline-containing proteins (hyproproteins) synthesized by cultured human fibroblasts have been partially characterized. The hyproprotein extracted from the cell layer was found to be similar to the collagen extracted from skin in the ratio of hydroxyproline to proline, chain composition, solubility, and re…
On a fait des mesures de l'aimantation et de l'effet Mössbauer du 57Fe sur de faibles substitutions de fer dans du BaFe12O19 pour Al, Cr, ZnTi, ZnGe, ZnSn, ZnZr, CuTi, CoZr ou NiTi. Pour Al nos mesures affirment les conclusions de Bertaut e. a. : l'Al commence par remplir les sites 2 a, puis il entre dans les sites 12…
Abstract Messungen der Adsorptionskinetik und der Gleichgewichtsadsorption an Aktivkohle, der Oberflächenspannung und der Benetzung von hydrophoben Festkörpern mit Natriumdodecylsulfat und Octylphenolnonaglykoläther in wäßrigen Lösungen von N‐Methylacetamid, Fruktose und Xylose, zeigten folgende Ergebnisse: Bei der Gl…
Abstract The optical absorption in CdO single crystals is reported for photon energies just below the absorption edge (≈ 2.4 eV) at several temperatures between 80 and 300 °K. The investigation of the shape of the intrinsic absorption indicates the existence of an indirect gap. The influence of the higher concentratio…
The photoplastic effect in ZnO is observed as a strong reversible increase in flow stress, during illumination with white light, when single crystals are deformed in basal slip at room temperature. An earlier model based on Read's theory for the space-charge region near a charged dislocation has been confirmed by furt…
We review recent experiments showing that electrical conduction in transition ferromagnetics at low temperature is by two currents of spin ↑ and spin ↓ electrons in parallel, mixed by spin-non-conserving collisions when temperature increases. The relative values of transition impurity resistivities for spin "up" and s…
When a grain interior dislocation meets a grain boundary it can move along the latter by a mixture of climb and glide. Vacancies are then cmitted or absorbed and sliding is caused in amounts depending on the orientation of the dislocation's Burgers vector, which in turn depends on the grain orientation. The consequenc…
The heat capacities of Fe ${(\mathrm{HCOO})}_{2}$\ifmmode\cdot\else\textperiodcentered\fi{}2${\mathrm{H}}_{2}$O and Ni${(\mathrm{HCOO})}_{2}$\ifmmode\cdot\else\textperiodcentered\fi{}2${\mathrm{H}}_{2}$O have been measured between 1.4 and 20 \ifmmode^\circ\else\textdegree\fi{}K. Peaks associated with long-range spin o…
Magnetization measurements, between 2 and 850 °K, on RFe2, RFe3, R6Fe23 and R2Fe17 compounds, for R = Y, Lu or Gd, have confirmed their ferromagnetic (R = Y or Lu) or ferrimagnetic (R = Gd) character. The Lu2Fe17 compound shows a ferro-antiferromagnetic transition and a neutron diffraction study revealed an helical sp…
Optical-loss mechanisms and transmission losses were investigated in clad glass fibers and in the bulk glass from which they were drawn. Measurements of the total losses, absorption losses, and scattering losses in both the fibers and in the bulk materials are presented and compared. Photomicrographs of scattered ligh…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpectra and cis-trans isomerism in highly dipolar derivatives of azobenzeneGavriella Gabor and Ernst FischerCite this: J. Phys. Chem. 1971, 75, 4, 581–583Publication Date (Print):February 1, 1971Publication History Published online1 May 2002Published inissue 1 February 1971h…
Abstract On the base of Schuster-Kubelka-Munk's theory, quantitative relations between the bulk absorp tion and diffuse reflectance spectra of undiluted and diluted semiconductor powder samples are established in the region of the long-wave tail of the absorption edge. Investigations in the long wave region of the d…
Solid‐state substitution of Bi and Nb ions in the perovskite crystal structure of Pb(Ti 0.47 Zr 0.53 )O 3 was investigated by sample weight changes at 1150°C in an “equilibrium” PbO atmosphere. A model is discussed that includes the effect of charge neutralization, requiring weight losses for A‐site substitutions and…
Magnetization measurements of single crystal spheres of Y, Ce, Pr, Nd and SmCo5 compounds yield the magnetic moment per formular unit 7.9, 6.6, 10.4, 10.4 and 7.7 µB, respectively. The anisotropy constants K1 (0) and K2 (0) at 0 °K estimated from the K1 and K2 vs temperature curves measured are 6.5 and ~ 0, 5.5 and ~…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpectroscopy of rare earth oxide molecules in inert matrices at 4.deg.KWilliam Weltner Jr. and Roger L. DeKockCite this: J. Phys. Chem. 1971, 75, 4, 514–525Publication Date (Print):February 1, 1971Publication History Published online1 May 2002Published inissue 1 February 197…
<div class="htmlview paragraph">A mathematical model to predict the performance of catalytic converter systems that reduce the hydrocarbon and carbon monoxide contents in automobile exhaust gas is described. This model contains all the important system parameters and process variables, and it predicts the perfor…
The diffusion creep of polycrystalline materials must be accompanied by grain-boundary sliding in order that material continuity be preserved. Since both grain-boundary sliding and the addition of atoms to a boundary between two grains result in a relative translation of the grains, it is possible to regard the materi…
New experimental results on the electrophydrodynamic instabilites in nematics are presented. Joined with previously reported properties, they allow a general classification of these instabilities in term of one DC and two AC regimes. A quantitive explanation of the AC regimes is given, in the frame of the Carr-Helfric…
The interaction of a fast electron (energy \ensuremath{\gtrsim} 1 keV) with collective modes in a thin metallic or doped semiconductor film is studied, taking explicitly into account bulk and surface effects. Reducing the problem to an exactly soluble quantum-mechanical model, we obtain results to all orders of the in…
In order to characterize more completely defect structures typical of high dose neutron irradiation experiments, the determination of perfect dislocation loop geometry, as defined by the direction and sese of the Burgers vector b and the loop plane normal n, has been re-examined. The practical aspects of electron diff…