Materials Literature
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The effects of Arochlor 5442 (a chlorinated terphenyl) dibutyl phthalate, butyl stearate, a high molecular weight polyester plasticizer, acetone, methyl ethyl ketone, isopropyl alcohol, carbon tetrachloride, and water on the dynamic mechanical properties of polycarbonate have been studied. Results show that all liquid…
Abstract During an investigation of the time for ignition of polymeric materials under the influence of radiant heating, it was found that the polymer surface reflectance‐absorptance characteristics were a major factor in the variance of the ignition times. A subsequent research study was made of the reflectance‐absor…
The early stages of crystallization in a lithium disilicate glass were studied by high-voltage transmission electron microscopy and diffraction at 1000 kV, using thin sections prepared from the bulk material. Heat treatment of the glass in the range 450°-500°C produced large numbers of internally-nucleated lithium dis…
The electronic structure of tetrathiofulvalene (TTF) has been determined from its photoelectron spectrum and the photoelectron data for the tetrahydro derivative of TTF and 1,3-dithiolane. Correlations of the ionization potentials (i.p.) and several molecular orbital calculations are used in the assignment of the phot…
A general method is developed for obtaining Clebsch-Gordan coefficients of finite groups. With this method Clebsch-Gordan coefficients are obtained in a matrix form, whereas the so-called basis-function generating machine generates these coefficients one by one. The method is applied to double point group D̄3, the poi…
Abstract The recrystallization of amorphous cellulose at various relative humidities was studied to clarify the relation between the amount of adsorbed water in cellulose and the molecular motion by the DSC method. The initial recrystallization kinetics of amorphous cellulose at various relative humidities were observ…
We report the waveguiding properties of sputtered films of three chalcogenide glasses: As(2)S(3), Ge(28)Sb(l2)Se(60), and Ge(33)As(l2)Se(55), at 1.064microm. Propagation losses of less than 1 dB/cm have been measured for As(2)S(3) films. Delineated guides, as well as films, have been made and studied.
Mechanisms of concentration quenching of green-Cu luminescence in hexagonal ZnS:Cu,Al under cathode-ray excitation are investigated. The observed concentration dependence of the luminescence intensity is explained well by a model assuming complete pairing of donors and acceptors. Interstitial Cu + centers are formed d…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure of potassium calcium hexanitrocuprate(II) at 295.deg.K. Evidence for a static Jahn-Teller distortionShozo Takagi, P. Galen Lenhert, and Melvin D. JoestenCite this: J. Am. Chem. Soc. 1974, 96, 21, 6606–6609Publication Date (Print):October 1, 1974Publication History…
Ultrasonic velocity measurements have been made on liquid Mg, Ca, Sr, and Ba to temperatures ~300 °C above the melting points. An empirical relationship between the sound velocity and surface tension is tested and found to hold well for the alkaline earth metals. Simple model calculations of the compressibilities at t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpin delocalization in square-planar spin-triplet benzene- and toluenedithiolatecobaltate(III)P. J. Van der Put and A. A. SchilperoordCite this: Inorg. Chem. 1974, 13, 10, 2476–2481Publication Date (Print):October 1, 1974Publication History Published online1 May 2002Publishe…
The eutectic between ZrO 2 and MgO was located at 27 wt% MgO. Directional solidification of this composition yields MgO rods in a cubic ZrO 2 matrix. Plane front growth occurred at solidification rates of <2.0 cm/h. The interfiber spacing was proportional to the inverse square root of the solidification rate. In sa…
A study is reported of the effects of the method of conversion of a fibre web into a non-woven fabric and of various constructional parameters on the air-permeability of the resultant fabric. It is shown that, within the ranges of measurement made, the factor most closely related to the air-permeability was the fabric…
Low energy (E &lt;2 eV) photoelectron transmission data have been obtained for thin hydrocarbon films at 77°K as a function of film thickness, which has been varied in steps of 10–70 Å. The photocurrent data approximate exponential attenuation which yield low energy range values which vary from 7 (n-nonane) to 82…
Abstract K 6 Co 2 O 7 ist ein weiteres neues Oxid mit Co IV (rotviolette Einkristalle). Nach Präzessions‐ und WEISSENBERG‐Aufnahmen hegt P2 1 /c vor; a = 6,58 5 , b = 9,12 3 , c = 11,47 9 Å, β = 127,1°. Strukturbestimmend sind Co 2 O 7 ‐Gruppen (zwei über eine gemeinsame Spitze verknüpfte Tetraeder, Symmetrie ≈ S 6 ).…
Abstract : Methods and procedures are presented for estimating nuclear weapon effects pertinent to hardened structures and for designing and analyzing such structures subjected to these effects. Weapon yields considered range from kiloton through multi-megaton size. Overpressure levels which may be treated range from…
Magnetostatic wave propagations in parallel layers of magnetic slabs have been considered. The dispersion characteristics depend strongly on the separation between slabs and their respective crystal plane orientations. The frequency range for nondispersive magnetostatic wave propagation can be extended as compared to…
Machine learning (ML) is transforming all areas of science. The complex and time-consuming calculations in molecular simulations are particularly suitable for an ML revolution and have already been profoundly affected by the application of existing ML ...Read More
Nuclear magnetic resonance (NMR) studies of 7Li ionic motion in four lithium and lithium-potassium silicate glasses of the R2O·4SiO2 and R2O·2SiO2 composition were made before and after heat treatment, and a newly developed equation was used for the analysis of the data. Other data from alkali borate glasses of the 3R…
The Slichter-Ailion (SA) theory for low-field rotating-frame relaxation by atomic diffusion in crystals is applied to a monovacancy mechanism of self-diffusion under the condition that a spin temperature is established between successive jumps of a nucleus but not between successive jumps of a vacancy (so-called high-…