Materials Literature
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The crystal structure of tetramethylammonium hydroxide pentahydrate has been determined at 25°C by an analysis of the three-dimensional x-ray-diffraction data. The unit cell is orthorhombic with a=12.57, b=10.96, c=7.91 Å and contains four formula units. The OH− ions and H2O molecules form a hydrogen-bonded framework…
The process of cratering in materials is described in terms of four phases: transient, primary, secondary, and recovery. Rod projectiles were used in an experimental study of the relative importance of each phase and its influence on final crater dimensions. Aluminum and steel rods with aspect ratios of 1/6 to 25 were…
Several aspects of x-ray scattering from thin films have been studied. A relation is presented which correctly gives the positions of the interference maxima in the scattered radiation and is shown to reduce to the Kiessig (specular) interference equation under the appropriate conditions. In particular, it is shown ex…
The gyromagnetic factor appropriate to a transition-metal salt such as KNi${\mathrm{F}}_{3}$, is inspected in detail, with emphasis on extracting information concerning $3d$-electron covalent mixing from experiment. The necessary spin-orbit and orbital Zeeman matrix elements are evaluated within the framework of Hund-…
The absorption and reflection spectra of ZnO crystals have been studied in the region of intrinsic absorption, and the data have been interpreted in terms of the wurtzite model given by Birman. Three intrinsic exciton transitions have been observed, one associated with each of the three valence bands. Several bound-ex…
The indirect optical absorption edge in silicon and germanium has been studied in the presence of shear strain. The splitting observed in the transmission spectrum is dependent on the direction and magnitude of the applied stress and on the polarization of the light with respect to the stress axis. The results have be…
Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text Donald E. McCarthy, "Transmission of Irtran Materials from 50 μ, to 300 μ," Appl. Opt. 5, 472_1-473 (1966) Export Citation BibTex Endnote (RIS) HTML Pl…
Abstract Zu den vielfältigen Möglichkeiten der Zerkleinerung gehört auch das Desagglomerieren auf Walzenstühlen und in Knetmaschinen. Dabei werden in hochviscosen Medien suspendierte Feststoffteilchen durch Strömungskräfte beansprucht und zerkleinert, sofern die Beanspruchung die Festigkeit der Teilchen überschreitet.…
Abstract Literature on thermal conductivity of natural rubber has been critically evaluated. Best values of thermal conductivity as a function of temperature were selected, and are presented in both graphical and tabular form. An attempt was made to consult all work that could significantly affect the choice of best v…
Abstract : Estimates of the surface self-diffusion coefficients of evaporated deposits were made from (1) the spread of material into a shadow cast by the placing of an object between source and substrate, (2) the decay on annealing of the step produced in a metal film deposited onto a mica surface with a cleavage ste…
Summary The effects of varying the type and size of the aggregate on the stress-strain characteristics of concrete and micro-concrete in compression and tension are described. By applying new experimental techniques, it has been shown that the use of a larger and rounder aggregate yields a concrete which attains a low…
The phenomenon of stress relaxation, the time decrease of internal stress due to localized flow in a solid under constant uniaxial strain, is viewed in terms of present kinetic theories and available data for metals. Rate equations for shear flow, derived from molecular models of liquids and gases, are reviewed briefl…
Magnetoresistance in single crystals of iron has been studied in fields up to 50 kOe at temperatures from 1°–300°K. Iron whiskers 40–700 μ in diameter grown by the hydrogen reduction fo FeCl2 and having residual resistance ratios ρ300°K/p4.2°K from 200 to 2000 have been used for the experiments. In low fields the magn…
Abstract Zerkleinerungsversuche mit tribolumineszierenden Stoffen zeigen, daß in der Spiralstrahlmühle in Randzonen der Treibstrahlen, und hier bevorzugt auf ihrer Rückseite, zerkleinert wird. In Abhängigkeit vom Durchmesser, von der Anordnung, Anzahl und der Form der Treibstrahldüsen werden die Zerkleinerungsvorgänge…
Abstract A novel and relatively simple procedure is described for the estimation of kinetic parameters in pyrolyses from DTA traces. The expressions derived are tested by utilizing data from experimental thermograms. Calculated values of parameters agree well with reported values.
A photoelastic solution of the distribution of stresses around a centrally located elliptical hole in a plate of finite width subjected to uniform axial loading is presented in this paper. Stress distributions at the boundaries are given for a wide range of the parameters, and stress-concentration factors have been co…
Neutron diffraction experiments under magnetic fields up to 15 kOe are performed on the helimagnetic spinel ZnCr2Se4. For fields of about 3 to 4 kOe, switching of 90° antiferromagnetic domains occurs. In the same field range, there is also a tilting of the spins rotation axis towards the field direction. In the field…
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Abstract The viscosity and osmotic pressure of a fraction of poly-2-vinylpyridine have been measured in various solvents, and the parameters concerning the solubility of this polymer, that is, the osmotic second virial coefficient, A2, the polymer-solvent interaction parameter, μ, and the solubility parameter, δ2, hav…
The present status of our concepts as to the origin of the structure and behavior of permanent magnet materials now in use is discussed. It is shown that domain theory can at least qualitatively explain the properties of all these permanent magnet materials. In some cases quantitative agreement between theory and obse…