Modules des differentielles en caracteristique p.

For a Nagata ring A, the module of absolute differentials is flat if and only if the morphism from A^P into A is flat with a socalled elementary fibre. For the proof strong modules and basic rings are defined and studied. A complete local ring is basic and produces strong modules in a natural way.     

Sur LaK-Analyticite De Certains Espaces D’operateurs

This paper examines in which case the space of continuous operators of a Banach spaceE within a Banach spaceF isK-analytic for the topology of strict, weak convergence.      

13C NMR spectra of s-triazolo-as-triazinones: Application to isomeric and tautomeric structure determination

¹³C NMR spectroscopic data are reported for the s-triazolo-as-triazinones of five isomeric series. Comparison of their ¹³C chemical shifts and CH coupling constants allows the determination of the type of ring junction of the two heterocycles, as well as the predominant tautomeric form in each system.     

The Oxidation of the Double Bonds of β-Elemene

Peracid oxidation of β-elemene ( 6 ) occurs by attack specifically on the isolated [isopropenyl] group at C(4). The structures of the epoxides thus obtained were demonstrated by [conversion] to tetrahydrogeijerol 12 (R ? H), which was identical with the substance obtained from geijerone ( 2 ) by reduction, first catalytically, then with metal hydride. Ozonolysis of β-elemene is less specific, attack occurring on the other isopropenyl group (at C(2)) in addition to the one at C(4), and subsequently on the vinyl group (at C(1)). The structures of the ozonolysis products were confirmed by a sequence of reactions from elemol.     

Die Änderung der Thermospannung im Magnetfeld (2. Ettingshausen-Nernst-Effekt) bei Kupfer,Silber und Palladium

An experimental device is described for measuring the change in thermoelectric power in magnetic fields (2nd Ettingshausen-Nernst-effect). The change in thermoelectric power was determined for the metals Cu, Ag, Pd at magnetic fields up to 20 kOe at liquid nitrogen temperature. At low magnetic fields there is a proportionality toB ². The temperature dependence of the 2nd Ettingshausen-Nernst-effect is reported for Cu.     

Über Wurzeln ergodischer Transformationen

Ohne Zusammenfassung     

Capacitive Discharge Graphite Furnace Laser-Excited Atomic Fluorescence of Thallium

For the first time, an anisotropic graphite furnace heated by capacitive discharge was used for laser-excited atomic fluorescence spectrometry. A detection limit of 5 fg for thallium was obtained with a laser repetition rate of 500 Hz and a peak integration time of 80 ms. The use of a capacitive discharge furnace allows for a shorter integration time, which in turn should allow for integration of less background noise, and improved detection limits. Theoretically, the magnitude of the shot noise should be proportional to the square root of the integration time, and inversely proportional to the square root of the laser repetition rate. Experimental data illustrated the effect of laser repetition rate, but were inconclusive with respect to integration time. The linear dynamic range of the calibration curve was six orders of magnitude, which was comparable to that normally obtained for laser-excited atomic fluorescence in modern commercial graphite furnaces. Thallium was accurately determined in NIST biological samples at levels one to two orders of magnitude below the detection limit of electrothermal atomic absorption spectrometry, with an analytical precision between 8 and 20%. The interference effects of calcium, sodium chloride, and potassium chloride on the thallium signal were investigated and shown to be similar to both laser-excited atomic fluorescence in a conventional furnace and capacitive discharge furnace atomic absorption results reported in the literature.     

The microscopic structure of bulk amorphous red phosphorus: A Raman scattering investigation

The microscopic structure of bulk amorphous red P has been investigated by Raman scattering. It is concluded that the phosphorus tubes of pentagonal cross-section present in Hittorf's P and KP₁₅ are the structural units of the amorphous red P network. Intratube and intertube correlations are responsible for intermediate range order effects. The Raman data indicate that a continuous transition from the crystalline to the amorphous state takes place for P.