Download or read book Infrared Lattice Vibrations of Magnesium Stannide written by A. Kahan and published by . This book was released on 1965 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Infrared Lattice Vibrations of Magnesium Stannide written by A. Kahan and published by . This book was released on 1965 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The room-temperature infrared reflection spectrum of semiconducting Mg2Sn with carrier concentration of 3 X 10 to the 17th power 1/cc has been measured between the wavelengths of 5 and 100 microns. By classical oscillator theory, the reflectivity of the fundamental lattice vibration region has been analyzed, and the following obtained: frequencies, strengths, and linewidths of the infrared active modes; high and low frequency dielectric constant values; and the refractive index n and extinction coefficient k as a function of wavelength. In order to fit the experimental results, it is necessary to assume two sets of dispersion parameters with the strong transverse optical (TO) resonance at 53.75 microns (186 1/cm) and a weak one at 48.25 microns (207 1/cm). (Author).
Download or read book Infrared Absorption of Magnesium Stannide written by Herbert G. Lipson and published by . This book was released on 1963 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: Infrared transmission and reflection measurements have been made on n- and p-type semiconducting Mg2Sn single crystals of different impurity con centrations between 2 and 30 microns, at temperatures ranging from 15 to 296 K. At incident energies less than 0.22 eV, strong free-carrier absorption is present: with alpha as the absorption coefficient and lambda the wavelength, this may be expressed as alpha=c(lambda to the 3/2 power) at all temperatures where acoustical mode lattice scattering predominates. The absorption spectra due to other mechanisms has been analyzed after subtraction of the lambda to the 3/2 power free-carrier dependence. At energies of 0.22 eV and above, the rapid increase in absorption is attributed to the intrinsic edge. From the energy dependence of the absorption coefficient in the edge region, the mechanism of indirect transitions between the valence and conduction band can be established, with a phonon energy of 0.008 eV. A band in the 0.08 to 0.22 eV energy range present at all temperatures in n-type and above 196 K in p-type samples is interpreted in terms of transitions between two conduction band minima separated by 0.165 eV at 15 K. (Author).
Download or read book Oscillator Analysis of LiF and MgO Reflectivity written by Alfred Kahan and published by . This book was released on 1966 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt: Classical oscillator theory is applied to the analysis of the fundamental lattice vibration reflectivity spectrum of LiF and MgO in the 200 to 800/cm wave-number range. For each material seven reflectivity curves, ranging from 7.5 to 1060K for LiF and from 8 to 1950K for MgO, are analyzed and the associated dispersion parameters as a function of temperature obtained. The reflectivity curves of both LiF and MgO can be fitted with two resonances at all temperatures. Resonance frequencies nu sub 1 and nu sub 2 are decreasing functions, whereas strengths 4 pi rho sub 1 and 4 pi rho sub 2 are increasing functions of temperature. At the higher temperatures, the width of the main resonance gamma sub 1 obeys a T91.0) power law for LiF and a T(1.5) LAW FOR MgO. In addition, optical constants, real and imaginary parts of the dielectric constant, and absorption coefficients are calculated as functions of wave number and temperature. A description of the classical analysis computer program is included, together with input requirements and FORTRAN IV listings. (Author).
Download or read book Microwave Dielectric Resonators written by Sally J. Nauman and published by . This book was released on 1965 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt: The resonant frequencies for the fundamental modes in circular cylindrical and rectangular parallelopiped high dielectric resonators have been calculated by computer for a range of values of physical dimensions and relative dielectric constant. The frequency range extends from zero to 50,000 Mc/sec, the relative dielectric constant from 50 to 1800, and physical dimensions from zero to 500 mils. Results are presented in tabular and graphical form with frequency plotted versus resonator length for parametric values of relative dielectric constant and cross sectional dimensions. A brief review of earlier work with high dielectric resonators is included. Expressions for the resonant frequency and fundamental mode field configurations are given. (Author).
Download or read book The Preparation and Structure of Thin Films of Boron on Silicon written by E. T. Peters and published by . This book was released on 1965 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Anomaly in the Resistivity temperature Profile of Ultrapure Phenanthrene written by Paul A. Andrews and published by . This book was released on 1965 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Crystal Structure of 2 4 amino 5 aminopyrimidy 2 pentene 4 one written by J. Silverman and published by . This book was released on 1965 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Government wide Index to Federal Research Development Reports written by and published by . This book was released on 1965 with total page 1794 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Application of a System of Fixed rotating Vectors to Circuit Analysis and Synthesis written by Carl T. Case and published by . This book was released on 1965 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: A system of fixed-rotating vectors can be used to study the impedance loci of functions of the first Foster form and of systems including negative impedance converters. Of particular interest in the field of dielectrics and biological membrane studies is a parallel RC network, where the dielectric of the capacitor is given by the Debye dispersion relations. Such a network also falls into the category of the first Foster form.
Download or read book On the Acoustic Basis of the Perception of Intonation by Linguists written by Philip Lieberman and published by . This book was released on 1965 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Earth to space Communications at Millimeter Wavelengths written by Edward E. Altshuler and published by . This book was released on 1965 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is expected that with the exploration of outer space, a requirement for high data rate earth-to-space communication channels will arise. A program to investigate the feasibility of using the millimeter-wave region of the spectrum for this application is presented. The theory of atmospheric attenuation resulting from losses due to absorption, scattering and refraction processes is reviewed and used to estimate propagation losses produced by atmospheric gases, clouds and precipitation. Curves of total atmospheric attenuation and noise level as a function of meteorological parameters and antenna elevation angle are also presented. A series of experiments designed to obtain as much information as possible on the limitations imposed by the atmosphere on millimeter-wave propagation is considered. Although experiments using natural celestial bodies such as the sun, moon, planets and galaxies as radio sources are emphasized, those which would utilize aircraft, rockets and satellites are also mentioned. Finally, the characteristics of a recently installed precision 29-ft antenna designed to operate at 35 Gc (wavelength = 8.6 mm) with a traveling-wave maser as a preamplifier for the radiometer are outlined along with the specific experiments for which this antenna system will be used. (Author).
Download or read book Reflection of Gigacycle per second Ultrasonic Waves from an Optical contact Bond written by Paul H. Carr and published by . This book was released on 1965 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nonlinear Terms in the Generalized Ohm s Law written by Noel Stone and published by . This book was released on 1965 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is shown that a spatial gradient in the steady flow of an ionized gas introduces terms into the generalized Ohm's law that represent an exchange of momentum between the electrons and the gas flow. Depending upon the flow geometry and gas compressibility this electrokinetic exchange can behave like a generator, a Hall current, or a resistive current. The scale of the phenomenon is L = +/V, where V is fluid velocity, + is electron-positive charge collision time. Electrokinetic conditions apply largely at boundaries. In a resistive medium with a static B-field, the principal condition for electron-flow interchange is that magnetic pressure dominate dynamic pressure. At the boundary of a plasma jet the scale over which EK terms are important is of the order of 1 mm. Only geometry and scale considerations are used in the momentum equation. The electrokinetic generation of surface currents is as fundamental for describing moving media as spacecharge effects are in the static case. (Author).
Download or read book On the Theory of Boolean Formulas written by E. W. Samson and published by . This book was released on 1965 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: The theory of substitutions for Boolean formulas developed in a previous report is applied here to the determination of those s-tuples of formulas that may be allowable replacements for s -tuples of sub-formulas of given Boolean formulas. The criteria of allowability are very general and flexible, yet may be expressed with great precision and ease. The results formalize and extend various known isolated instances. They may be used for the study of a large number of problems in the theory and application of Boolean formulas and functions.
Download or read book Hydromagnetic Equilibrium and Toroidal ring Current Systems written by Marvin L. White and published by . This book was released on 1965 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Natural Sapphire is Now Being Re constructed written by Kendrick N. Hemmenway and published by . This book was released on 1965 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
