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排序方式: 共有151条查询结果,搜索用时 15 毫秒
1.
The synthesis of various N-1 substituted ethyl 4-pyrazolecarboxylates via reaction of ethyl 2-formyl-3-oxo-propionate (= ethoxycarbonylmalondialdehyde) with appropriately substituted hydrazines is described. Moreover, detailed nmr-spectroscopic investigations with the title compounds are presented. 相似文献
2.
The superconductivity-induced self-energy of phonons has been calculated in the lowest-order conserving approximation using conventional strong-coupling theory and also including scattering at nonmagnetic impurities. Results for the dependence of the shift and the width of phonons on temperature and scattering rates are presented and their sensitivity on the strength of the electron-phonon coupling and on impurities is pointed out. The theory is applied to optical data in YBa2Cu3O7 using the experimental one-phonon density, the value ofT
c
and [*=0.25 as inputs. Neglecting anisotropies and the momentum dependence of the electron-phonon coupling the resulting strong-coupling model with 2.9 yields results which are in good agreement with the data, in particular, if impurity scattering is taken into account. 相似文献
3.
Several stereoisomers of 2,6,10-trimethyl-2:5, 7:10-diepoxy-dodeca-3,5,11-triene ( 3 ) have been isolated from the oil of Artemisia pallens. The synthesis of the isomeric mixture is described. 相似文献
4.
Uwe K. A. Klein Gertrud Hönes Friedrich W. Hafner 《Photochemistry and photobiology》1984,40(5):569-574
Abstract —The time-dependent rotational relaxation of Rhodamine 6G in fresh and dried human blood serum was investigated using picosecond phasefluorometry. Measurements were also carried out in aqueous solutions of amino acids, glucose, urea, and bovine serum albumin to evaluate our model for the interactions. It is shown that the distribution of Rhodamine 6G between the aqueous and the protein phase of the blood serum strongly depends on protein concentration and temperature. 相似文献
5.
Zusammenfassung Es wird ein einfaches Verfahren zur Dünnschichtchromatographie von Phenol sowie isomeren Kresolen und Xylenolen auf formamidimprägnierten Kieselgel-G-Platten beschrieben. Die Methode läßt sich direkt auf die Analyse solcher Weichmacher anwenden, bei deren Verseifung Phenole entstehen.
Summary The separation and identification of phenol and the isomeric cresols and xylenols by thin-layer chromatography on silica gel plates impregnated with formamide is described. The method is applicable to the direct analysis of phenols from saponificated plasticizers.相似文献
6.
7.
Lortz R Wang Y Demuer A Böttger PH Bergk B Zwicknagl G Nakazawa Y Wosnitza J 《Physical review letters》2007,99(18):187002
The specific heat of the layered organic superconductor kappa-(BEDT-TTF)(2)Cu(NCS)(2), where BEDT-TTF is bisethylenedithio-tetrathiafulvalene, has been studied in magnetic fields up to 28 T applied perpendicular and parallel to the superconducting layers. In parallel fields above 21 T, the superconducting transition becomes first order, which signals that the Pauli-limiting field is reached. Instead of saturating at this field value, the upper-critical-field increases sharply and a second first-order transition line appears within the superconducting phase. Our results give strong evidence that the phase, which separates the homogeneous superconducting state from the normal state is a realization of a Fulde-Ferrell-Larkin-Ovchinnikov state. 相似文献
8.
9.
G. Zwicknagl 《Zeitschrift für Physik B Condensed Matter》1980,40(1):31-38
Local electronic properties have been calculated for the amorphous transition metals Nb, Mo, and Tc using a cluster model which accounts for the topology of the local structure. Trends in the density of states observed in metallic glasses are reproduced, and the behaviour of the averaged electron-phonon coupling strength correlates well with the behaviour of the superconducting transition temperature. The ratios of the critical temperatures in the amorphous and the crystalline state are reproduced correctly. The results show that the change in the critical temperature on going from the crystalline to the amorphous state can be explained by the change in short-range order. 相似文献
10.
G. Klein Gertrud Pollauf Marie Krisch Elisabeth Farkass F. Schusta Anneliese Niethammer G. D. Lander C. K. Glycart M. Wagenaar F. Pavelka L. van Itallie A. J. Steenhauer A. L. W. E. van der Veen G. Denigès L. Rosenthaler D. Krüger E. Tschirch H. Tangl R. Fischer F. Stauder F. Dangl L. Kofler H. Hilbck C. Griebel F. Weiß A. Hinrichs L. Klemm O. Mohr H. Alber M. Gläser Th. Morawski und J. A. Rose 《Fresenius' Journal of Analytical Chemistry》1933,91(1-2):48-68
Ohne Zusammenfassung 相似文献