[en] Erwin Schroedinger (1887-1961) belongs without doubt to the most outstanding physicists of our century. His name is inseparably connected with the development of quantum theory with the formulation of his famous wave equation being his greatest achievement. This relation became generally known as the Schroedinger equation and its understanding was fundamental to the progress of modern quantum theory. In 1933 Schroedinger's work was honoured by the award of the Nobel Prize in physics. In the booklet Schroedinger's life, work and philosophical views are outlined against the social and physico-historical background of his time

[en] In spring 1945 the leading German nuclear scientists were tracked down by a special unit of the Allies and were interned at Farm Hall, a country house near Cambridge. Their confidential talks about the development of the ''uranium machine'' and the political dimensions of the bomb were recorded by the British Secret Service and were released recently, almost 50 years after the end of the war. The Farm Hall records are a unique document of the times which informs about the Third Reich research into nuclear energy utilization and about the general relation between science and politics. This volume compiles the text of the records, portraits and concise biographies of the ten internees, and an interview with Carl Friedrich von Weizsaecker. (HSCH)

[en] Automatic translation: Theoretical considerations on the problem of pressure build-up in the Absorber layers of a shutdown bar made of 72.5% Cu + 25% B₄C + 2.5% TaC by (n,a) reactions revealed that in these Layers through the resulting helium gas pressures up to one Order of 100 atü can be built up. For high Differential pressures in the range from 60 atm to 100 atm were achieved Experiments demonstrated that the permeability coefficient for Helium increases linearly, which used to be the case for small differential pressures was given as 0.1 cm²/s.

[en] Systematic studies are made on the CO₂-signal in tooth enamel to improve the calculation of the absorbed dose D_E. They consist of experiments on the effect of heating on the CO₂-signal and the examination of the long-term development of the signals after irradiation and after heating experiments. On suitable teeth both single- and multiple-aliquot methods were used to calculate an absorbed dose D_E. The peak to peak intensity of the CO₂-signal shows an enhancement within 3 days of irradiation. Furthermore a transient increase in the signal intensity after heating tooth enamel at 120 deg. C is observed, which mostly fades within 10-20 days. After artificial irradiation it is necessary to wait at least 3 days before electron spin resonance measurements can be done. Differences in signal growth curves obtained using various protocols, for example single- or multiple-aliquot methods with and without heating after irradiation, are presented. Results for tooth enamel are compared with analogous experiments on the CO₂-signal in carbonates. (author)

[en] In a blow-off device for limiting excess pressure in nuclear power plants, at least one condensation tube disposed so that a lower outflow and thereof is immersed in a volume of water, and an upper inflow end of the condensation tube extends out of the volume of water and is connectible to a source of steam that is to be condensed or a steam-air mixture, the outflow end of the condensation tube, for stabilizing the condensation being provided with an assembly of wall parts forming passageways extending in axial direction for subdividing the steam flow and bubbles produced in the volume of water, the passageways of the assembly of wall parts being stepped in axial direction at both axial ends of the assembly of wall parts

[en] The outlet flow side of a condensation pipe immersed into a water reservoir is equipped with internals. These are a concentric orifice tube with an annular gap, a perforated hollow cone, or a multitude of annular diaphragms. The annular diaphragms have sections of perforated orifices. The internals can be used to initiate a spray action at the overflow edges multiplying the heat transfer area of the cooling water relative to the steam flow. (DG)

[en] A level 2 trigger has been implemented at HERA for the H1 experiment in order to increase the data rate for rare events and suppress the out-of-time back ground events

[en] The discharge pipe region of the vent pipe of a BWR is immersed in a water pool. In order to smooth condensation respectively to avoid combination of steam bubbles in the discharge pipe region a stepped bundle of pipes is arranged at its opening. It consists either of individual pipes lying beside each other on circular rings, concentrical with respect to a central pipe, or of pipes concentrical with respect to each other, the annular gaps being provided with sinusoidally corrugated intermediate sheets. These serve to subdivide the annular gaps and as spacers. The envelope of the stepped bundle of pipes forms a double cone, one half of which is touching into the water pool and the other half into the discharge pipe region itself. (HP)

[en] A safety culture must exist in nuclear installations which recognizes the primary and ultimate responsibility for nuclear safety of those who manage and operate the installation. United States Nuclear Regulatory Commission (USNRC) has taken steps to eliminate unnecessary requirements. They include the Marginal to Safety (MTS) program, the implementation of the Regulatory Review Group (RRG) recommendations, the Cost Beneficial Licensing Action (CBLA) initiative and the Technical Specifications Improvement Program (TSC). These programs are discussed. (N.T.)

[en] Automatic translation: A helium circuit of the magnitude present in a gas-cooled reactor demands from the individual components an extremely high gas tightness. This not only follows a problem in the manufacture of such components, but also when testing and measuring gas tightness. So had to Tightness measurement methods further developed and on a large scale use to be expanded. Using the AVR steam generator as an example it is demonstrated that for a plant of this size a Measuring sensitivity in the order of 10^-6 Torr 1/s can be achieved.