J. Wohlgemuth, Das Tier und seine Wertung im alten Judentum ... [Rezension]

Max Grunwald

Das Tier im Alten Testament : ein Beitrag zur modernen Tierschutzfrage

von William Waldemar Petersen

Neue Bürger in der heimischen Tier- und Pflanzenwelt

Von Mittelschullehrer Kalkreuth

Entdeckungsgeschichte - die Reise der "Peiho" nach Nova Britannia : Geologie und Geographie - Tier- und Pflanzenwelt : Beiträge zur Anthropologie

von Prof. Dr. Otto Reche

Zwey gar schöne Newe Weltliche Lieder, welche vormahlß nie inn Truck außgangen : Das Erste. Ach mein liebes Blümichen, und meine liebe Rose, etc. ...

In Fraktur

Die Tier- und Pflanzenwelt in der Passionslegende

Von R. Reichhardt

Über die ethische Höhe unseres Tier- und Vogelschutzes

Von Wilhelm Schuster

Die deutschen Kolonien in Wort und Bild : Geschichte, Länder- und Völkerkunde, Tier- und Pflanzenwelt, Handels- und Wirtschaftsverhältnisse der Schutzgebiete des Deutschen Reiches

von Gustav Meinecke, Direktor des Deutschen Kolonialmuseums

Metallic Fluence Monitors and J-value standards

Utilizing the neutron-irradiation parameter J is one of the major uncertainties in 40Ar/39Ar dating. The associated error of the individual J-value for a sample of unknown age depends on the accuracy of the age of the geological standards, the fast-neutron fluence distribution in the reactor and the distances between standards and samples during irradiation. While it is generally assumed that rotating irradiation evens out radial neutron fluence gradients, we observed axial and radial variations of the J-values in sample irradiations in the rotating channels of two reactors. To quantify them, we included three-dimensionally distributed metallic fast- (Ni) and thermal- (Co) neutron fluence monitors in three irradiations and geological age standards in three more. Two irradiations were carried out under Cd-shielding in the FRG1 reactor in Geesthacht, Germany, and four without Cd-shielding in the LVR-15 reactor in Rez, Czech Republic. The 58Ni(nf,p)58Co activation reaction and ?-spectrometry of the 811 keV peak associated with the subsequent decay of 58Co to 58Fe allow to calculate the fast-neutron fluence. The fast-neutron fluences at known positions in the irradiation container correlate with the J-values determined by mass-spectrometric 40Ar/39Ar measurements of the geological age standards. Ra-dial neutron fluence gradients are up to 1.8 %/cm in FRG1 and up to 2.2 %/cm in LVR-15; the corre-sponding axial gradients are up to 5.9 and 2.1 %/cm. We conclude that sample rotation might not al-ways suffice to meet the needs of high-precision dating and gradient monitoring can be crucial.

Electric current of an electrified jet issuing from a long metallic tube.

This paper presents an analysis of the transport of electric current in a jet of an electrically conducting liquid discharging from a metallic tube into a gas or a vacuum, and subject to an electric field due to a high voltage applied between the tube and a far electrode. The flow, the surface charge and the electric field are computed in the current transfer region of the jet, where conduction current in the liquid becomes surface current due to the convection of electric charge accumulated at its surface. The electric current computed as a function of the flow rate of the liquid injected through the tube increases first as the square root of this flow rate, levels to a nearly constant value when the flow rate is increased and finally sets to a linear increase when the flow rate is further increased. The current increases linearly with the applied voltage at small and moderate values of this variable, and faster than linearly at high voltages. The characteristic length and structure of the current transfer region are determined. Order-of-magnitude estimates for jets which are only weakly stretched by the electric stresses are worked out that qualitatively account for some of the numerical results.

Low-injection behaviour of a solar cell with a metallic grating back-reflector

Recent studies have dealt with the possibility of increasing light absorption by using the so-called electric field enhancement taking place within the grooves of metallic gratings. In order to evaluate the potential improvements derived from the absorption increase, we employ a simplified model to analyze the low-injection behaviour of a solar cell with a metallic grating back-reflector.