Materials Literature
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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…
Abstract The single‐strand helix‐coil transition in various oligo‐ and polyadenylates is characterized by means of an improved cable temperature‐jump technique. In all the polymers studied {poly(rA), poly(dA), poly[A(m2′)] and poly[A(e2′)]} helix‐coil relaxation is observed in the time range from 30 to 1000 nsec. Rela…
Abstract An energy-dispersive X-ray diffractometer using a solid-state detector is constructed for the determination of the liquid structure. It has two merits over the usual angle-dispersive diffractometer, i.e., a higher resolution of the s-value and a wider measurable s-region. The procedure of the data analysis an…
Thermal depolarization current (TDC) of polypyromellitimide film was measured in order to obtain knowledge of the charging and discharging mechanisms of carriers in polypyromellitimide. Two peaks are observed at 173 (α) and 50 °C (β) in the dried film. The β peak attributed to dipole orientation polarization is probab…
The heat capacities of glasses near the feldspar compositions KAlSisO8, NaAlSiaOs, and CaAlzSizOr, and of crystalline anorthite were measured between | 2 and 380 K by means of an adiabatic calorimeter. Difference plots, C!(glass) - C!(crystals), show pronounced maxima at 30 K for KAlSisOs, at 50 K for NaAlSirOr, and a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolution structure and reactivity of hydridoiron tetracarbonyl anion, [HFe(CO)4]-M. Y. Darensbourg, D. J. Darensbourg, and H. L. C. BarrosCite this: Inorg. Chem. 1978, 17, 2, 297–301Publication Date (Print):February 1, 1978Publication History Published online1 May 2002Publis…
It has been postulated that phenol-containing areas of plant and animal tissues were osmiophilic, but proof of direct interaction between osmium tetroxide and phenolic materials, or the nature of such reactions, has been lacking. We find that, under conditions similar to those of normal tissue fixation, osmium tetroxi…
Poly-beta-hydroxybutyrate (PHB) is a uniquely procaryotic endogenous storage polymer whose metabolism has been shown to reflect environmental perturbations in laboratory monocultures. When hydrolyzed for 45 min in 5% sodium hypochlorite, PHB can be isolated from estuarine detrital microflora in high yield and purified…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPresence of a static Jahn-Teller distortion in copper(II) terpyridine complexes. 1. Crystal structure of diterpyridinecopper(II) nitrateR. Allmann, W. Henke, and D. ReinenCite this: Inorg. Chem. 1978, 17, 2, 378–382Publication Date (Print):February 1, 1978Publication History…
Formate dehydrogenase (EC 1.2.1.2) from Pseudomonas oxalaticus has been isolated and characterized. The enzyme (molecular weight 315000) is a complex flavoprotein containing 2 FMN, 18--25 non-heme iron atoms and 15--20 acid-labile sulphides. In the last step of the purification, a sucrose gradient centrifugation, a se…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic exchange interactions in transition-metal dimers. 12. Structural and magnetic characterization of the di-.mu.(1,3)-azido complex [Cu2(Me5dien)2(N3)2](BPh4)2 and similar di-.+-.(1,3)-azido copper(II) dimers. Unusual zero-field splitting in the electron paramagnetic r…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReducing fuel nitrogen oxides (NOx) emission: molecular nitrogen formation from fuel nitrogenSachio Sugiyama, Norio Arai, Masanobu Hasatani, Shinji Kawamura, Ichibei Kudou, and Naoyoshi MatsuhiroCite this: Environ. Sci. Technol. 1978, 12, 2, 175–180Publication Date (Print):F…