[en] The described method is to be used for determining the measuring effectiveness of liquid scintillation measurements of radioactive samples (paper or glass fibre filters etc.) with the aid of correction curves. It is based on parallel measurements of an external standard and of the sample under varying conditions

[en] Subject of this paper is the experimental investigation of bubble formation and detachment with simultaneous heat transfer from single submerged orifices at high system pressures and temperatures. The experiments are made in the system water vapour-water. (orig./TK)

[en] Albino mice were subcutaneously injected with carbon 14 dimethyl aminopyrines, the methyl group of which can be metabolised in the organism into carbon dioxide 14. The following results were obtained: In the carbon dioxide 14 exhalation of neonate, young and adult animals after administration of carbon 14 aminopyrine, distinct differences were noted. The maximum of elimination via the lungs occurs after 20-30 minutes in grown-up mice, in neonates or young animals distinctly later (60-90 min). The carbon dioxide 14 exhalation was also measured after additional subcutaneous application of methrotrexate. In mice aged 8 and 10 days a distinct decrease in carbon dioxide 14 exhalation was found. By contrast, a rise in carbon dioxide 14 exhaled was found in mice aged 2 days. The orientating experiments with folic acid and carbon 14 dimethyl aminopyrine show that leucovorin leads to a distinct increase in carbon dioxide 14 exhalation during the first 30 minutes. As a cause of the different degrees of stimulation respectively inhibition of demethylation, different biochemical ways of formaldehyde formation are pointed out. One of these probably includes the folate-dependent reaction. (orig./MG)

[en] The 10th reactor meeting of the Deutsches Atomforum and the Kerntechnische Gesellschaft was held from April 4-7, 1978 in the civic hall of Hanover. The 16 plenary lectures, reported on in some detail in this article, dealt with the 'Main lines of reactor technology', the 'Fuel cycle and waste management' and 'Nuclear energy within the overall framework of the energy industry and of economy, worldwide interrelations included'. Besides three 'controversial subjects of nuclear energy' and one public evening lecture, 263 papers were read in eight technical sessions. (orig.)

No abstract available

[en] The pathologico-sonographical findings of 267 patients were put into contrast with the corresponding radiographic findings and/or the surgically confirmed final diagnosis. In 147 patients the diagnosis was not verified surgically. In 86 patients the sonographic and radiographic findings were compared with the surgically confirmed final diagnosis. The rate of correspondence of ultrasound findings and surgically confirmed final diagnoses was 93.1%. Of these, 10.5% of the cases showed partial correspondence. The radiographic findings were verified in 87.2% by the surgically confirmed final diagnosis. Of these, 52.3% were negative cholecystograms. The comparison of sonographic and radiographic findings with the surgically confirmed final diagnosis led to the result that with respect to the assessment of the gall bladder, ultrasound diagnostics provides more information than contrast media examinations. Because of the high degree of accuracy, because of the possibility to establish more differentiated findings and because of the total absence of any risks, it is recommended to apply ultrasound in the first examination when there is the suspicion of a gall-bladder disease. (orig./MG)

[en] The piping design for nuclear power plants projects reveals, at the beginning, a modification through the application of new fabrication techniques for prefabrication and assembly. This report presents a fabrication methodology which aims to minimize the fabrication and assembly costs as well as to improve and assure quality. (Author)

[en] Full text of the speech with which the Chancellor addressed the Deutsche Forschungsgemeinschaft. In this speech he states, among other things, that in his opinion nuclear power will be indispensable in the long run. However, in a democratic society, projects of this dimension cannot be realized without the consent of the public. Therefore, one should early open one's eyes and ears for problems which harass people today of may harass them tomorrow. (RW)

[en] Level indicator for determining the position of two-phase boundary layers resp. the density profile of a gas-loaded liquid at high temperatures and pressures. It consists of a metallic heating rod with a double thread on its shell into which a heating conductor is inserted. In addition the heating rod has got a central pocket boring from which in regular intervals between the groves cross-borings lead to the surface. The outlet openings are closed gas-tight by means of thermocouples. The lead-in wires for the thermocouples are laid in the cross borings and the pocket boring. The accuracy of measurmenent depends on the distance of the thermocouples from one another. The level indicator may be used e.g. by direct evaporators operated with superheated steam resp. Loeffler boilers. (RW) 891 RW

[en] An equipment for nuclear resonance measurement at definite temperatures was built for kinetic examinations of cobalt complexes in methylacetate. From changes of the proton resonance signal, some kinetic parameters (entropy and enthalpy of activation) could be derived. 49 refs., 13 figs., 6 tabs