Materials Literature
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Experimental optical third-harmonic coefficients for inert gases are presented and compared with experimental Kerr coefficients and theoretical dc hyperpolarizabilities.Received 12 June 1967DOI:https://doi.org/10.1103/PhysRevLett.19.556©1967 American Physical Society
Essigsäurelösung bis zur Entfärbung titriert.Darauf gibt man 70 ml einer 0,5-n.methanolischen Jodlösung (Zusatz von 5 g KJ pro 100 ml) zu; man rührt weitere 10 Stdn.bei -40 °C und noch 2 Stdn.bei Zimmertemperatur.Das überschüssige Jod wird mit Natriumthiosulfat zurücktitriert.Die Lösung wird mit Natriumbicarbonat vers…
A study has been made of the wear of various hard steels sliding unlubricated in dry air and in dry carbon dioxide at temperatures up to 500°C. Over the range of loads and speeds employed the wear is of a mild character and the wear debris is of oxide particles, no metallic debris being formed. The characteristics of…
Films of As2Se3 and Sb2Se3 and their mixtures have been studied by electron microscopy and diffraction. On heating amorphous As2Se3 films no change occurs, but the Sb2Se3 films and mixtures of Sb2Se3 and As2Se3 transform to give small single crystals. These crystals have their c axes parallel to the substrate and give…
EXPERIMENTAL INVESTIGATION HAS PROVED THE RELATIONSHIP BETWEEN SIZE AND SHAPE OF TEST SPECIMENS - CYLINDERS AND PRISMS - AND THE DIRECT TENSILE STRENGTH OF CONCRETE. ALTHOUGH TWO DIFFERENT GRADES OF CONCRETE WERE TESTED WITH RIVER PEBBLES AND WITH GRANULATED AGGREGATES, NO ESSENTIAL DIFFERENCE WAS FOUND IN THE CURVE O…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAmmonia in auto exhaustJohn H. Harkins and Stephen W. NicksicCite this: Environ. Sci. Technol. 1967, 1, 9, 751–752Publication Date (Print):September 1, 1967Publication History Published online1 May 2002Published inissue 1 September 1967https://pubs.acs.org/doi/10.1021/es6000…
A computer expression for predicting the shielding effectiveness of an infinite plane shield has been developed for low frequencies (below 50 kHz). It is shown that this expression, which arises as a special case of the solution of the general wave equation, is a sum of the attenuation term of Schelkunoff's transmissi…
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The effect of stress relaxation by creep on the thermal stress fracture of brittle ceramics at high temperature under conditions of quasi‐static heat flow is discussed. It is shown that, to a good approximation, thermal stress relaxation rates can be calculated on the basis of creep rates which correspond to the minim…
Summary A number of new alkaline-earth-rare-earth silicate and germanate compounds with the apatite-type structure have been synthesized including a new calcium lanthanum silicate, Ca 4 La 6 (SiO 4 ) 6 (OH) 2 , which has a 9·63 Å, c 7·12, and c/a 0·740. This has a random distribution of Ca 2+ and La 3+ over the (4f) a…
Summary The immediate Q/I relation of K in a soil relates the amount of labile K present to its chemical potential, measured relative to the chemical potential of (Ca+Mg) in the same soil. The present work shows that the form of the Q/I relation is almost unchanged either by large additions of K, up to 3750 kg K 2 O/h…
A two-valence-band model and the theory of transport in semiconductors with non-parabolic bands have been used to explain the carrier concentration dependence of the room-temperature thermoelectric power and below-room-temperature Hall mobility of undoped and Na-doped PbTe. It was assumed that the scattering is by lat…
Considerable x-ray diffraction analysis of omega phase in titanium alloys has been reported; however, little direct observation of its occurrence via electron microscopy has been published. In this work we have demonstrated by means of transmission electron microscopy that the omega phase in titanium-35% niobium preci…
This paper presents the results of measurements of the velocities of 〈12̄10〉 (0001) edge dislocations in zinc as a function of applied shear stress. All tests were conducted at room temperature on 99.999% pure zinc monocrystals. Dislocations were revealed by means of the Berg-Barrett x-ray technique. Stress pulses of…
The spreading behavior and equilibrium contact angle, θ, of organic liquids on soda‐lime glass surfaces were observed at relative humidities (rh) varying from 1 to 95%. Increasing rh increased θ for many nonhydrophilic liquids on glass; no comparable effects occurred with nonadsorptive solid surfaces. The decrease in…
Covers advancements in spacecraft and tactical and strategic missile systems, including subsystem design and application, mission design and analysis, materials and structures, developments in space sciences, space processing and manufacturing, space operations, and applications of space technologies to other fields.
Grain size and other structural features are known to influence the mechanical properties of mild steels, and it is shown that their effects in stress-corrosion crack propagation are essentially the same as their effects upon plastic-flow characteristics. Preferential corrosion in the grain-boundary regions of mild st…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Structure-Activity Relationship in Barbiturates and Its Similarity to That in Other NarcoticsCorwin. Hansch and Susan M. AndersonCite this: J. Med. Chem. 1967, 10, 5, 745–753Publication Date (Print):September 1, 1967Publication History Published online1 May 2002Published…
The materials scientist is concerned with relating microstructure and properties. In crystals, most of the important imperfections can only be observed by transmission through thin foils (T.E.M.), first accomplished by Heidenreich in 1949. The truly amazing growth of T.E.M. is due mainly to three factors: a) improveme…
The room-temperature oxidation behaviour of reactive metal and ceramic powders is reviewed and it is shown that many materials under normal circumstances oxidize to give a limiting film thickness of ∼50Å. Since the thickness of oxide films has an important bearing on sintering characteristics the control of oxidation…