Materials Literature
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Simple perturbation theory predicts that the lattice thermal conductivity should be inversely proportional to the absolute temperature. It is shown that the lattice thermal conductivity of minerals should not depart markedly from that variation, even when the average phonon mean free path is comparable to the lattice…
Ordered protodolomite, CaMg(CO(3))(2), has been synthesized at 100 degrees C by reaction of metastable precipitated carbonates with aqueous magnesium-bearing solutions. Initial reaction products have expanded crystallographic cells, attributed to the presence of structural water. Longer reaction time produces a protod…
It is shown that attractive electron-electron interaction arising from the exchange of two optical phonons is a possible mechanism for superconductivity in some degenerate semiconductors. This mechanism is present independent of whether the semiconductor is many-valley or not. Application to SrTi${\mathrm{O}}_{3}$ is…
MOLYBDENUM wire, as a coating material, is well known since molybdenum has many advantages as a hard bearing surface; it is highly scuff‐resistant and has a low coefficient of friction. Metco now announce a self‐fusing, high‐molybdenum powder which can be plasma flame sprayed to produce tough, wear‐resistant coatings…
An analytical study of the operation of electret transducers subject to relative displacements of the electrodes comparable to the thickness of the air gap (or air gaps) between electret and electrodes is presented. In particular, the relations between generated voltage and time history of the transducer capacitance a…
Assuming the atomic motions in water, methanol and ethanol as similar to those of solids, the effective Debye temperature has been calculated as a function of temperature and pressure for these liquids.
The study of the chemistry of so-called conventional photography, based on the photosensitivity of silver halides, has been a part of chemical research for nearly 150 years, yet it still has many unanswered questions to deal with.
Abstract The complex carbonates of iron(III) are shown to be anionic in nature. The solutions containing these complexes show a maximum absorbance at 460 nm. The complex carbonates of iron(III), viz., (i) K 6 [Fe 2 (OH) 2 (CO 3 ) 5 ] · H 2 O, — (ii) Na 2 [Fe 3 O 2 (OH) 3 (CO 3 ) 2 ], — (iii) K[Co(NH 3 ) 6 ] 2 [Fe 3 (O…
Diffusion treatments may comprise the diffusion of interstitial elements such as oxygen, nitrogen, carbon, or boron into the surface from a gaseous or molten salt bath environment, or less commonly it may consist of substitutional diffusion of a previously deposited metal coating or by packing in materials such as fer…
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…