Materials Literature
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A two-dimensional polyacrylamide gel electrophoresis technique is presented for separation of acid-extracted proteins of isolated nucleoli of normal rat liver and Novikoff hepatoma ascites cells. About 100 distinct protein spots were resolved. Comparison of the patterns for normal liver and Novikoff hepatoma revealed…
Abstract The transformation of vaterite to calcite was investigated systematically. The transition temperature and the energetics of the transformation were determined from differential thermal curves. The variations of lattice constants and crystallite size, accompanying the transformation were studied by X-ray diffr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPulse radiolytic study of the site of hydroxyl radical attack on aliphatic alcohols in aqueous solutionK. D. Asmus, H. Moeckel, and A. HengleinCite this: J. Phys. Chem. 1973, 77, 10, 1218–1221Publication Date (Print):May 1, 1973Publication History Published online1 May 2002P…
It is shown that the angular distribution of back-scattered electrons can be observed in a scanning electron microscope, and that the patterns observed can be used to obtain crystallographic information about the specimen. The patterns are termed electron back-scattering patterns (E.B.S.P.). The use of these patterns…
Bond-strength-bond-length relationships for bonds between oxygen and H+, Li+, Be2+, B3+, Na+, Mg2+, Al3+, Si4+, P5+, S6+, K+, Ca2+, Sc3+, Ti4+, V5+, Cr6+, Mn2+, Fe3+, Fe2+, Co2+, Cu2+, Zn2+, Ga3+, Ge4+ and As5+ have been derived by requiring that the sums of the bond strengths around the cations be equal to their vale…
This paper provides a brief introduction to the theory and practice of low-energy electron diffraction, a tcchnique which is proving useful for investigating the structure of surfaces. Emphasis is given to clean well-defined surfaces which are studied also with Auger electron spectroscopy and under conditions of ultra…
N F Mott and E A Davis London: Oxford University Press 1971 pp xiii + 437 price £7·50 It is hard to think of a physicist other than Professor Mott who would be able to attempt successfully a book of such a broad compass and in Dr Davis, a specialist in the field of amorphous semiconductors, he has found an ideal co-au…
This work centers on the now disputed interpretation of the observed ${T}^{\ensuremath{-}\frac{1}{4}}$ dependence of the conductivity in amorphous group-IV semiconductors by hopping near the Fermi energy. We find the arguments against this interpretation inapplicable. We present experimental results of the temperature…
The conductivity of gas-free thin films of amorphous germanium was measured as a function of temperature and film thickness. Existing theories of hopping conduction have been modified to apply to very thin films. The results are consistent with experiment, indicating that hopping conduction near the Fermi energy is th…
A review is presented of the status of problems involving the interaction of matter and optical-band electromagnetic radiation of intensity such that any medium becomes a fully ionized plasma. The following are considered within the framework of the single-electron approximation in the case of nonrelativistic energies…
The alimentary and vascular systems are discussed. The "alimentary prosopon" of polymerid trilobites is thought to show the course of the superficial dorsal vascular system. The arrangement of segments in the cephalon and thorax is investigated. Evidence of six cephalic segments is found. The articulation and enrollme…
The ferroelectric and antiferromagnetic orthoferrite BiFeO 3 has been studied extensively using the Mossbauer effect technique. The sublattice magnetization data are not in agreement with those previously published but do agree with data for other orthoferrites and for iron oxides in general. The several phase transit…
Abstract When hydroxide ions are added to a solution of Cr(H 2 O) 6 3+ ions at low temperature a well crystallized chromium hydroxide hydrate is formed, corresponding to the formula [Cr(OH) 3 ‐(H 2 O) 3 ] ∞ . Its structure is the inverse of bayerite type, two thirds of the octahedral M 3+ positions being vacant. It lo…
A model is solved for a fluid of biaxial particles within a type of mean-field approximation. The results suggest that the phase diagram of such a fluid exhibits a special critical point where two second-order critical lines meet a first-order phase boundary in a sharp cusp. The features of the phase diagram suggest a…
First-principles calculations of the electronic band structure for the layer-type compounds $2H\ensuremath{-}\mathrm{Nb}{\mathrm{Se}}_{2}$ and $2H\ensuremath{-}\mathrm{Mo}{\mathrm{S}}_{2}$ predict a 1-eV hybridization gap within the ${d}_{{z}^{2}}$ and ${d}_{\mathrm{xy}}$, ${d}_{{x}^{2}\ensuremath{-}{y}^{2}}$ manifold…
The model of a large-scale potential relief is used to explain the most striking effects typical for the amorphous semiconductor, the switching and the memory. The potential relief was produced experimentally in a classical crystal semiconductor, n-germanium, by compensation with fast neutrons. This results in the app…
Les structures magnétiques de TMn2O5 (T = Lu, Er, Y, Ho, Tb, Nd) ont été étudiées par diffraction neutronique. Pour toutes ces terres rares, l'ordre des spins des Mn3+ et Mn4+ est hélimagnétique, avec un vecteur de propagation κ = ½ 0 τ: la maille chimique est donc doublée suivant a, et les spins d'une maille à l'autr…
The anisotropic viscoelastic and heat-conductivity properties of nematic liquid crystals offer the possibility of obtaining thermal convection with very low thresholds in homeotropic films heated from above. We present experiments on $p\ensuremath{-}\mathrm{m}\mathrm{e}\mathrm{t}\mathrm{h}\mathrm{o}\mathrm{x}\mathrm{y…
An initial oxidation process is studied on 5.59 at. % Si–Fe alloy (100) and iron (100) single crystals by the photoelectric work function combined with Auger electron spectroscopy in the low-pressure range of oxygen (10−8−10−6 Torr). A 46-V Auger peak of iron is split into two peaks (41 and 49 V) followed by an oxygen…
The thermal conductivity of cerium magnesium nitrate has been measured over the temperature range 0.2-1.5\ifmmode^\circ\else\textdegree\fi{}K. When an assumption is made that the surface of the crystal is damaged to a depth of 150 \ensuremath{\mu}m by sandblasting, the conductivity measurements are entirely described…