[en] The results of the EIR collector test series of the summers 1978 and 1979 are presented. In total, there are 37 different collectors available on the Swiss market. The results are compared with those from the IEA (International Energy Agency) of presuggested reference collectors. Test methods are described and also the construction of the test bench. Also, briefly described is a development method for the calculation of gross heat yield from solar collectors. Then the characteristics of the reference collectors in connection with the test periods are considered, and their role in the calculation of results of single collector test series explained. A description of the spectral photometer is given. (A.N.K.)

[en] The authors present the results of a test programme of solar collectors performed during the summer of 1978. (G.T.H.)

[en] Neutron separation energies in ⁹¹Zr, ⁹²Zr and ⁹⁵Zr were determined by measurements of relative Q-values for (d,p) reactions on Zr isotopes. A comparison is made with separation energies derived from a previous measurement of (d,t) reaction Q-values. The neutron separation energy in ⁹⁵Zr disagrees by three standard deviations with the adjusted value in the 1977 Atomic Mass Evaluation. (orig.)

[en] A review of the existing experimental data on the induced and isomeric fission has been done. The experimental values are compared with the theoretical predictions by using various single-particle models. A possible method to extrapolate the data to the far of beta-stability line nuclei is suggested. (author)

[en] The effect of the simultaneous coupling of a quasi-particle to pairing vibration and quadrupole vibration is presented. It is shown that the quasi-particle coupling to pairing vibration gives a small contribution to the excitation energies of odd tin isotopes

No abstract available

No abstract available

[en] The steady-state heat transfer equation has been solved for the determination of temperature profiles in a diathermic oil flowing through a linear boiler placed on the focal line of cylindrical parabolic solar concentrators. Finite-difference methods have been employed to solve the equation, by assuming Nikuradse velocity profiles and available experimental data to supply boundary conditions and to estimate equation parameters. A set of solutions for several physical and geometrical situations is shown and discussed in order to give useful indications on the design of solar power plant. (author)

[en] A decent life for the world population is unthinkable without technical progress. This means nuclear power, now and at once, to cover the energy demand as large-scale solar energy utilisation is still in its beginnings. (HP)

[en] For the computation of the gross heat output of solar collectors by means of meteo data and characteristic collector parameters two programs were developed: MURD for the determination of the ''mean usable radiation density'' and ETA for the calculation of the collector efficiency i.e. relative values of gross heat output. The main features of these programs are described and detailed instructions for the use of them are given. Results of some cases for the meteo-situation of Zurich airport are given. (Auth.)