[en] Guidelines for the programming and auditing of software written in high level languages for safety systems are presented. The guidelines are derived from a framework of issues significant to software safety which was gathered from relevant standards and research literature. Language-specific adaptations of these guidelines are provided for the following high level languages: Ada83 and Ada95; C and C++; International Electrochemical Commission (IEC) Standard 1131-3 Ladder Logic, Sequential Function Charts, Structured Text, and Function Block Diagrams; Pascal; and PL/M. Appendices to the report include a tabular summary of the guidelines and additional information on selected languages

[en] The reaction ¹⁴C(α, γ) ¹⁸O has been measured in the alpha energy range of E_α = 1.14-2.33 MeV. The resonance strengths of the 4⁺ resonance at E_α = 1.14 MeV and of the 1^- resonance at E_α = 1.79 MeV have been measured relative to the ¹⁴C(p, γ)¹⁵N resonance at E_p = 0.528 MeV. Additionally, two nonresonant γ-transitions to the ground state and to the first excited state of ¹⁸O were found. The energy dependence of their cross sections can be described by the direct capture process and its interference with the two 1^- resonances at E_α = 1.79 and 2.33 MeV. (orig.)

[en] The rates for proton- and alpha-capture reactions on light nuclei (A less than or equal to 13) close to the proton drip line are calculated from available nuclear structure information. The influence of these reactions as link reactions between the nuclei in the pp chains and the CNO nuclei in hydrogen burning at different temperatures and densities is discussed. 30 refs

[en] The reaction /sup 22/Na(p,γ)/sup 23/Mg has been investigated in the energy range E/sub p/ = 0.4--1.27 MeV using a radioactive /sup 22/Na target. Upper limits for the γ yield have been determined for transitions to states in /sup 23/Mg up to E/sub x/ = 4.4 MeV. The upper limits for the expected resonances in this energy range are more than an order of magnitude weaker than previously predicted. These upper limits are compared with shell model calculations

[en] Guidelines for the programming and auditing of software written in high level languages for safety systems are presented. The guidelines are derived from a framework of issues significant to software safety which was gathered from relevant standards and research literature. Language-specific adaptations of these guidelines are provided for the following high level languages: Ada, C/C++, Programmable Logic Controller (PLC) Ladder Logic, International Electrotechnical Commission (IEC) Standard 1131-3 Sequential Function Charts, Pascal, and PL/M. Appendices to the report include a tabular summary of the guidelines and additional information on selected languages.s

[en] The reaction¹⁴C(p, γ)¹⁵N has been measured in the proton energy range of E_p=250-740 keV. Five resonances have been observed and their strengths were determined. Additionally, 5 nonresonany γ-rays were found to the states at E_x=0.0, 5.27, 5.30, 6.32 and 9.05 MeV. The energy dependence of their cross sections can be described by the direct capture process and the low-energy tails of the broad resonances at E_R=1319 and 1509 keV. (orig.)

[en] The reactions ³¹P(p, γ)³²S and ³¹P(p, α)²⁸Si have been studied in the energy range 280-620 keV to investigate the influence of low-energy resonances on the stellar reaction rates. Several new resonances have been observed and the resonance strengths for both reaction channels have been determined. The reaction rates have been calculated from the present results and are compared with the results of Hauser-Feshbach calculations. (orig.)

[en] The reaction ²⁸Si(p,γ)²⁹P has been measured in the proton energy range of E_p=0.37-2.95 MeV. The strengths of the observed resonances have been determined and the spectroscopic factors for the ground state and first excited state in ²⁹P have been extracted from fits to the excitation functions. The stellar reaction rate has been calculated from the present results and is compared with previous values. (orig.)

[en] A lot of mechanical damages of aging phenomena (solute dislocations-atoms interactions) in the temperature range of 20 - 600 C have been observed in zirconium alloys. The systematic influence of the addition elements (oxygen, niobium) and the exact characterization of the aging domain stay nevertheless badly known. In this study, new zirconium alloys have been specially prepared from a zirconium - 2.2% hafnium bar with a low amount in oxygen (80 ppm), and characterized by different mechanical tests. The dynamic aging phenomena are bound to weakly positive values of sensitivity of the deformation velocity stress. These phenomena are then modelled for the standard alloy called Zr702 containing a high amount of oxygen (1300 ppm): hole of sensitivity of the stress at the deformation velocity around 300 C, creep and relaxation stops at 200 and 300 C and tensile plastic deformation heterogeneities along the specimen barrel. The behaviour model used in finite elements is based on the dynamic aging phenomenological model proposed by MacCormick, validated on aluminium alloys and on steels, and applied here at the Zr702 alloy in the temperature range of 20-400 C. (O.M.)

[en] Laser scanning extensometry was used to detect and characterize propagating plastic instabilities such as the Luders bands at the millimeter scale. Spatio-temporal plastic heterogeneities are due to either static or dynamic strain ageing (SSA and DSA) phenomena. Regarding zirconium alloys, different type of heterogeneities were observed: their features strongly depended on mechanical test conditions. In one case, they appeared to be non propagating but preserved along the stress-strain curve and were associated with SSA effects such as stress peaks after relaxation periods or after unloading steps with waiting times. In other case, they appeared as non propagating but were not associated with SSA effects. (authors)