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Abstract Die Rutilform des GeO 2 wird über eine endotherme Reaktion mit Cl 2 als Transportmittel, bei Abscheidungstemperaturen unterhalb 900°C, in großen säulenförmigen Kristallen erhalten. Die Farbe der Kristalle ist je nach Versuchsbedingungen gelb bis bernsteinfarben. Der Vergleich der berechneten und der experimen…
High-temperature spin dynamics in one-dimensional, spin 1/2, Heisenberg systems CuCl 2 ·2NC 5 H 5 and Cu(C 6 H 5 COO) 2 ·3H 2 O is studied by the measurements of proton spin-lattice relaxation rate, T -1 1 . The field dependence of T -1 1 can be fitted by an expression T -1 1 = P H -1/2 + Q , which gives direct eviden…
Lithium, sodium and potassium isobutyrates, isovalerates and isocaproates were submitted to a differential scanning calorimetric investigation in the temperature range between 320 K and the isotropic melt region. The collected phase transition temperatures and heat effects are compared to those of the corresponding li…
<div class="htmlview paragraph">The fuel economy was sharply improved from our 1976 model rotary engine cars mainly through modifications to the engine and improvements in the reactivity of the thermal reactor system.</div> <div class="htmlview paragraph">The progress of our development on these item…
Light and electron microscopy revealed that there are both rods and cones in the retina of the eel Anguilla rostrata. The rods predominate with a rod to cone ratio of 150:1. The spectral sensitivity of the dark-adapted eyecup ERG had a peak at about 520 nm and was well fit by a vitamin A2 nomogram pigment with a lambd…
Die Natur von Sb2O5, die bis in die heutige Zeit umstritten war, konnte jetzt durch Kristallstrukturanalyse geklärt werden. Koordinations- und Verknüpfungsprinzipien stimmen mit denen von B-Nb2O5 überein. Dies ist die erste derartige Beziehung zwischen dem Pentoxid eines Haupt- und eines Neben-gruppenelements.
The authors have measured the lattice thermal conductivity of very pure aluminium in the temperature range between 1.5K and 15K by suppressing the electronic thermal conductivity with a magnetic field in the Corbino geometry. Taking into account a linear term in the magnetoresistance in the extrapolation procedure, it…
Abstract Descriptions on the absolute configuration at C-5 of cacalol have been confused. Ozonolysis of cacalol afforded (S)-(+)-2-methylhexanedioic acid. The asymmetric center at C-5 of cacalol, cacalone, and of sesquiterpenes related to these compounds was therefore established to be (S)-configuration.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSyntheses of electronegative substituted tetrathiafulvalene derivativesShigeo Yoneda, Tokuzo Kawase, Mikio Inaba, and Zenichi YoshidaCite this: J. Org. Chem. 1978, 43, 4, 595–598Publication Date (Print):February 1, 1978Publication History Published online1 May 2002Published…
A differential radial distribution function (DRDF) of molten natural rubber (NR) was derived from its wide-angle x-ray scattering (WAXS) data. Three peaks with Bragg spacings 4.85, 2.31, and 1.23 Å corresponding, respectively, to interchain, C1-C3 and C1 -C2 distances are present in the corrected WAXS curve. The deriv…
Magnetization curves of single crystals were measured from 4.2 K up to T c (≃30 K). The magnetization is approximately expressed by M = M 0 +χ w H in higher fields. χ w which reflects the antiferromagnetic character, was found to be almost isotropic and temperature-independent (≃8×10 -6 emu/g). M 0 is anisotropic; 0.9…
A number of properties, chemical composition, density, isothermal transport coefficients, paramagnetic susceptibility, and specific heat, of an anthracene char are investigated during the carbonization process. A simple physical picture for the carbonization process which assumes the existence of density fluctuations…
The ferroelectric phase transition of mixed crystal systems of Rb 2 SO 4 –(NH 4 ) 2 SO 4 and CS 2 SO 4 –(NH 4 ) 2 SO 4 was studied by measuring the lattice constants, the dielectric constant, the spontaneous polarization and the proton spin-lattice relaxation time with functions of temperature and concentration of Rb…
The mirror-substrate method was used for measuring the penetration depth of 0.5–3-keV electrons in solid hydrogen and deuterium. The penetration depth was found to be 0.53×1018E1.72 molecules/cm2 with the energy given in keV. There was satisfactory agreement with other data. The measurements also showed that the escap…
The paper describes application of integral approach to the numerical computation of fields in a multi-dielectric, three-dimensional system. The accuracy of the method has been studied by taking a simple example of parallel-plate electrodes containing two-layer dielectrics. The use of fictitious point charges has been…
The phase relations of several A 5 B 10 O 30 - and A 6 B 10 O 30 -type solid solutions were determined, where A=Ba, Pb, Sr, Ca, Na and K, and B=Nb and Ta. The tungsten-bronze(TB)phase was observed in a wide range of the A 5 B 10 O 30 -type niobates, though the end components for A=Ba, Sr, Ca are not of the TB structur…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic resonance investigation of the autoreduction of tetraphenylporphinatoiron(III) chloride in the presence of piperidineJohn Del Gaudio and Gerd N. La MarCite this: J. Am. Chem. Soc. 1978, 100, 4, 1112–1119Publication Date (Print):February 1, 1978Publication History Pu…
Previously reported calorimetric Debye temperatures for 17 ferroelectrics are corrected for a simple oversight in applying the Debye theory, and ${\ensuremath{\Theta}}_{D}'\mathrm{s}$ for four more ferroelectrics are reported for the first time. Where possible, comparisons with elastic ${\ensuremath{\Theta}}_{D}'\math…
The theory of liquid crystals appears to require revision: the nematic properties of compounds of type (1), Rn-alkyl, were not predictable. On account of their particular physical properties, the new liquid crystals are of interest as anisotropic solvents for spectroscopy in ordered systems.
This paper surveys quantum effects in diffusion, with special emphasis on isotope effects for hydrogen isotopes in metals. The various possible contributions to the isotope effect are surveyed, and their importance assessed. The bcc metals (V, Nb, Ta) and fee metals (Cu, Ni, Pd) involve different mechanisms, and these…