Materials Literature
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Some properties of a linear chain of harmonically coupled double wells are studied by the technique of the transfer operator. Exact values for the chain specific heat, the displacement probability density, and the first six even moments of the dynamical displacement correlation function are obtained. The model is show…
A 75-keV electron beam with a low angular divergence (8 \ifmmode\times\else\texttimes\fi{} ${10}^{\ensuremath{-}6}$ rad) combined with a Wien filter spectrometer is used to measure the dispersion of the ${\ensuremath{\omega}}^{+}$ and ${\ensuremath{\omega}}^{\ensuremath{-}}$ modes for suface plasmons in thin oxidized…
A theory of the vibrational spectra of glasses is presented, and equations are derived specifically for the Raman intensities. The theory is applicable to glasses of the oxide type [such as glasses in the system ${M}_{2}\mathrm{O}\ensuremath{-}L \mathrm{O}\ensuremath{-}\mathrm{S}\mathrm{i}{\mathrm{O}}_{2}\ensuremath{-…
The first measurement of the hole mobility and its temperature dependence in thermally grown SiO2 on Si is reported and found to follow μ≃20 exp(−0.6eV/kT) cm2/V sec. In agreement with previous studies, the energy required to form an electron−hole pair with ionizing radiation is found to be field dependent and at very…
The classical Mie theory for the scattering and absorption of electromagnetic radiation by a sphere is extended so as to be applicable to cases in which longitudinal polarization waves can propagate in the sphere material. The extended Mie theory is applied to the calculation of the optical properties of small metal s…
The lineshape is studied in the simplest approximation free from the difficulty of divergence caused by a singular nature of the system. Characteristics of the linewidth are obtained for both short- and long-ranged scatterers. By assuming δ-potential scatterers, the lineshape is calculated explicitly as a function of…
The electronic-energy-band structure and full-Brillouin-zone Fermi surfaces of the layered dichalcogenides, $1T\ensuremath{-}\mathrm{T}\mathrm{a}{\mathrm{S}}_{2}$ and $1T\ensuremath{-}\mathrm{T}\mathrm{a}{\mathrm{Se}}_{2}$, have been calculated using the Korringa-Kohn-Rostoker method in the muffin-tin approximation. W…
It is pointed out that a model which agrees well with the observed properties of semiconducting glasses is an attractive Hubbard model of localized states. Such a model has no gap for two-electron excitations but an energy gap for one-electron ones. The suggested physical model for a two-electron excitation is a new c…
Neutron scattering measurements on deuterated hydrogen cyanide have shown that the structural phase change from a tetragonal to an orthorhombic form at 160K is a first-order transition. A transverse acoustic phonon mode, which has the symmetry of the phase change, was observed at very low energies and showed 'softenin…
Studies of electrochromism in evaporated and chemically prepared tungsten-oxide films have shown that electrocoloration takes place only in films containing H2O. A model is proposed in which the electrocoloration process is attributed to the formation of a ‘tungsten-blue’ phase following cathodic reduction by active h…
Experiment consists of a flash bulb surrounded by water and fired by a battery.
Abstract Die Anfänge der Halbleiterphysik reichen bis in die späten 20er und frühen 30er Jahre zurück. Der hier wiedergegebene Festvortrag zu Heinrich Welkers 60. Geburtstag im Jahre 1972 gibt vor allem wieder, wie Welker schon sehr früh die entscheidenden Beziehungen fand für die Steuerung von Elektronenströmen im Fe…
Abstract Stereoirregular, isotactic , and syndiotactic poly(propylene) were decomposed by the gaschromatographic pyrolysis technique. Some components of the tetramer fraction were identified and resolved into the two possible diastereomers. The relative intensities of these vary according to the tacticity of the decom…
More recent CNDO calculations by Maggiora indicate that the atu orbital is at higher energy than the a2u in porphyrin as well as in the reduced porphyrins.This is different from our results, but does not affect explanations of the spectra because the order of the (al,, eg) and (azu eg) excited configurations is not ch…
Abstract The determination of the diffusion coefficient for water in various porosity cellulose acetate membranes by a gravimetric method, using a humidified carrier gas, is described. It was found to be impossible to obtain meaningful results for very porous membranes, although dense membranes gave limiting values of…
"Determination of sand Roughness for fixed beds." Journal of Hydraulic Research, 13(2), pp. 221–222
Abstract Durch Umsetzung von Tetrakis(trichlorsilyl)silan mit Methanol und Triäthylamin als HCl‐Akzeptor werden in Abhängigkeit von den Reaktionsbedingungen Tetrakis(trimethoxysilyl)silan ( I ) bzw. ein Gemisch von I , Tris(trimethoxysilyl)silan ( II ), Bis (trimethoxysilyl)‐silan ( III ) und Tetramethoxysilan erhalte…
The TRI Flammability Analyzer has been used to determine the effects of moisture on the flammability characteristics of textile materials. Both moisture in the fabric and in the test environment have been considered for a number of un treated and flame-retardant-treated fabrics. The results are reported and interprete…
ing a range of cluster sizes produced by the appropriate heat treatment are currently under way.I wish to thank A. Staudinger and D. M. Maher for the TEM results in
The protoplasts of a mutant of Bacillus subtilis 168 (B. subtilis CMK33) are osmotically fragile when compared to protoplasts of the parent organism and contain an active, membrane-associated phospholipase A1. A protein found in the parent organism specifically inhibits the phospholipase A1 (Kent, C., and Lennarz, W.J…