Materials Literature
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A theoretical discussion is presented on the fundamental processes by which pulsating gas bubbles in liquids dissipate their energy. The survey is limited to the case where the amplitude of the volume pulsations are assumed to be sufficiently small that the pulsations may be described by linear equations. A portion of…
Abstract Many-electron wave functions are usually constructed from antisymmetrized products of one-electron orbitals (determinants) and energy calculations are based on the matrix element expressions due to Slater (1931). In this paper, the orbitals in such a product are replaced by ‘group functions’, each describing…
Electroluminescence occurs in activated ZnS thin films at 1.5 volts rms (peak voltage 2.2 volts) corresponding to electron energies less than the band gap (3.8 electron volts) and less than the mean energy (2.6 electron volts) of the photons emitted. The light emission decreases by ${10}^{4}$ between 2.0 and 1.5 volts…
A small angle intensity is to be expected from double reflections in any powder sample comprising small grains with random orientation. The inter-grain contribution is due to an hlcl reflection in one grain, followed by the same hkl reflection in another grain. The intra-grain contribution arises from a hlcl reflectio…
The crystal structure of Ti2Ni has been determined from powder specimens. The unit cell is facecentered cubic with 96 atoms and dimension a=11.278+_0.001 /I at 21 C. The space group is O~z-Fd3m. 64 titanium atoms are in positions 48f and 16c, and 32 nickel atoms are in positions 32e. The atomic parameters, X_~i =0.215…
Ammonia and deutero-ammonia have been studied by single-crystal and powder X-ray methods.There are four molecules in the cubic unit cell, and the space group is confirmed to be P2 1 3.The nitrogen parameter obtained by 0 least squares refinement is equal to 0.0401 for NH 3 at -102 C and the same for ND 3 at -l60°C.Cel…
Article Zur Systematik und gruppentheoretischen Ableitung der Symmetrie-, Antisymmetrie-und Entartungssymmetriegruppen was published on November 1, 1959 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 111, issue 1-6).
Abstract Der Auflösungsvorgang des Elektrolytkupfers in Elektrolyten wurde anhand des Korrosionsstroms i 0 verfolgt. Für die Auflösungsgeschwindigkeit in 0,25 n‐NaCl und 0,25 n‐KH 2 PO 4 gelten die exponentiellen Beziehungen: i 0 = 0.20 . t 1.67 , bzw. i 0 = 0.08 . t 0.695 , und in 0.5 n‐KNO 3 gilt die lineare Beziehu…
Article Structural polytypism of lead iodide and its relationship to screw dislocations was published on November 1, 1959 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 111, issue 1-6).
Abstract A technique is described for the small scale evaluation of plastisol formulations for molding, casting, coating, and foam applications. The technique described rapidly measures and automatically records the viscosity of a plastisol as a function of temperature by means of a Bendix Ultra‐Viscoson and thermocou…
Abstract The method of continuous and intermittent stress relaxation measurements on rubber vulcanizates developed by Tobolsky and co‐workers has been modified by the introduction of intermittent tangent modulus measurements during the continuous relaxation experiments. This allows rate of scission and crosslinking to…
Vorschläge zur Vereinheitlichung von Ultraschall‐Prüfbefunden für die Aufstellung von Richtreihen und Vorschriften durch Zuordnung von Ersatzfehlergrößen zu kleinen Fehlstellen auf Grund ihrer Echohöhe. Durchführbarkeit des Verfahrens mit beliebigen Geräten, Prüfköpfen, Frequenzen und einer Platte aus dem Werkstoff de…
Grain-boundary and lattice diffusion of zinc vapor into copper at 550°C were measured with the electron-probe microanalyzer and the results were used to calculate the diffusion coefficients. The lattice diffusion coefficient DL increases from 5×10−13 to 3×10−11 over the concentration range from 2 to 27.5 atomic percen…
Abstract The effect of antirads (compounds added to reduce changes of polymer properties during irradiation) on the crosslink yields in black‐loaded natural rubber stocks during gamma irradiation has been measured. The crosslink yields were determined by swelling techniques. Antirads decrease the crosslink yields if o…
Summary Hardness is an important index in the performance of confectionery and other fats. Using an instrument and technique which were essentially a modification of those used in the Brinell test as applied to metals, the effect of composition and polymorphic form on the hardness of fats was investigated. It was foun…
Abstract Die Filigrankorrosion ist eine besondere Art der atmosphärischen Korrosion, die bevorzugt auf lackierten Stahlblechen auftritt. Der Angriff beginnt mit der Ausbildung von Elektrolyttropfen, z. B. an hygroskopischen Verunreinigungen der Blechoberfläche und bleibt auf das kleine Volumen dieser Tröpfchen scharf…
Abstract Polysulfonamides may be prepared readily in high molecular weight by interfacial polycondensation. They are formed rapidly at room temperature when a disulfonyl chloride in an organic solvent is emulsified with a diamine in water containing an acid acceptor. The highest polymers have been obtained from alipha…
A study has been m ad e of the effect of dryin g a nd purification of polycaprolacta m (ny lon-6) on its thermal d ecomposition . The conclusions drawn from p reviou work, t hat a h ydrolytic mechanism is a t least p art iall y operating due to th e presence of water a nd ac id poly m er ization catalysts, are confirm…
Luminescence induced by Co60-gamma excitation of some organic solvent-solute pairs has been compared with 2537 A excitation as to dependence of intensity on solute concentration and on concentration of an added quencher. The solutions studied were 1,6-diphenylhexatriene in benzene, p-terphenyl in benzene, and p-terphe…
Article Synthesis and crystallography of the wurtzite form of silicon carbide was published on November 1, 1959 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 111, issue 1-6).