Materials Literature
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Given a uranium atom moving in U, UC, or UO2, a carbon atom moving in UC, or an oxygen atom moving in UO2, with energy <10 MeV, the fraction of that energy which is dissipated in atomic motion is calculated. Results are presented in graphical form.
Abstract The ac electrical conductivity and anisotropy, including an evaluation of the dielectric constant, at 10 8 and 2 × 10 8 Hz in the range 77 to 350°K is investigated. A hopping mechanism is evidenced from the dispersion of conductivity observed below 200°K, and is associated with the existence of tails of local…
Article Notizen: Neubestimmung der Struktur von Kaliumhexacyanoplatinat (IV), K2[Pt(CN)6] / A Re-investigation of the Crystal Structure of K2[Pt(CN)6] was published on February 1, 1974 in the journal Zeitschrift für Naturforschung B (volume 29, issue 1-2).
A high temperature mass spectrometric investigation of the congruent vaporization of vanadium monosulfide, VS(s), from 1700 to 2000°K has shown that the two principal vaporization reactions produce VS(g) and V(g) + S(g) with a minor contribution from the reaction to produce VS2(g) + V(g). Thermodynamic results were ob…
Spodiosite analogs are a class of compounds related to the apatite family. The ir spectra (4000 to 200 cm −1 ) and the laser‐Raman spectra were obtained for several analogs (Ca 2 (XO 4 )Cl in which X=P, As, or V) prepared by a reaction flux technique. Fundamental modes were identified, and empirical band assignments w…
The gland cells of Lyonet's gland, which is accessory to the silk gland in the silkworm larva, is characterized by the presence of complicated canaliculi bearing microvilli on their inner surface, large numbers of mitochondria and remarkably convoluted basal plasma membrane. On the other hand, the cell lacks the well-…
<div class="htmlview paragraph">This paper presents a new concept for very high supercharging of engines. Based on a novel combination of engine and turbocompressor, this concept enables the overall supercharge efficiency to be increased considerably which, taking into account recent advances in the field of gas…
An analysis is performed to investigate free and forced oscillation of a gas bubble and cavitation in viscoelastic liquids of a three-parameter Oldroyd model. The first-order perturbation method for small amplitudes has been employed to obtain periodic solutions to the bubble dynamics equation. Consideration is given…
Abstract The iron chelates of polymethyl-substituted dipyrromethenes were prepared. The ferrous ion was found to form complexes having a ligand to metal ratio of 2 : 1 with 5,5′-substituted dipyrromethenes, 3,3′,5,5′-tetramethyl- and 3,3′,4,4′,5,5′-hexamethyl-dipyrromethene. On the other hand, the ferric ion gave a co…
The structure of the interstitially ordered lattice formed in zirconium–oxygen alloys has been studied with use of single-crystal data obtained by X-ray and neutron diffraction methods. The structure belongs to space group P312 and the lattice parameters a and c are related to a0 and c0 of the host hexagonal metal lat…
Copper single crystals which appeared free from dislocations in X-ray topographs were deformed in tension. Very sharp and large yield drops, up to 70% of the upper yield stress, were observed. The lower yield stress was about 20g/mm2 for all dislocation-free crystals. Lüders band propagation was observed by X-ray topo…
Abstract The way in which polymer molecular structure controls structure on higher levels of organization in a solid polymer is briefly reviewed, as is also the way in which structure, on all levels, controls physical properties. The “line of descent” from molecular structure to physical properties is then illustrated…
Rather sharp zero-phonon lines accompanied by many vibronic lines are observed in the near-ultraviolet luminescence and excitation spectra due to the 4f-5d transitions of Ce 3+ ion in YPO 4 and LuPO 4 crystals at low temperature. Comparing the vibrational energies of the vibronic lines with the results of infrared and…
The morphology and cell wall composition of Bacillus coagulans, a facultative thermophile, were examined as a function of growth temperature. The morphology of the organism varied when it was grown at different temperatures; at 37 C the organism grew as individual cells which increased in length with increasing growth…
RESUME Le cortex de la face dorsale (non ciliée) ne contient pas de cinétosomes; sous des alvéoles bien développés se trouve un épiplasme épais, puis une couche irrégulière de microtubules longitudinaux; de nombreux pores cylindriques traversent le cortex. La région ventrale, limitée aux faces internes des 2 lèvres ap…
The ordered structures of Cu–Pt alloys containing 65–78 at. % Pt have been investigated by a combined technique of selected-area electron diffraction and dark-field electron microscopy using thin foils prepared from bulk specimens, and three different types of ordered structure have been observed. Below the order–diso…
Relaxation times T1 and T2 of 207Pb in liquid PbCl4 have been studied for the purpose of establishing an absolute nuclear shielding scale for lead. T1 has been decomposed into scalar and spin-rotation contributions using variable temperature measurements at the two field strengths 6.59 and 16.90 kG. T2 is much shorter…
Abstract The concentration of impurity–vacancy dipoles in potassium bromide crystals doped with strontium bromide was measured using the ionic thermocurrent (ITC) technique. The parameters of the dipole relaxation are: fundamental relaxation time 4 × 10 −14 s , activation enthalpy 0.66 eV. The effect of 60 Co γ‐irradi…
Abstract It is shown that the presently available information on the structure of bulk amorphous polymers is consistent with the concept of the existence of a substantial amount of short‐range segmental order. It is suggested that the sharp change of molecular‐weight dependence of NEWTONian viscosity of polymer melts…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLow-valent metal isocyanide complexes. IV. Crystal and molecular structure of cis-antibis-(pentahaptocyclopentadienyl)dicarbonyldi(.mu.-methyl isocyanide)diiron(Fe-Fe), (.eta.5-C5H5)2F2(CO)2(.mu.-CHCH3)2F. A. Cotton and B. A. FrenzCite this: Inorg. Chem. 1974, 13, 2, 253–256…