Abstract. The radiation data collected by the Standard Radiation
Environment Monitor (SREM) aboard ESA missions INTEGRAL (INTErnational Gamma-Ray Astrophysics Laboratory), Rosetta, Herschel,
Planck and Proba-1, and by the high-energy neutron detector (HEND)
instrument aboard Mars Odyssey, are analysed with an emphasis on
characterising galactic cosmic rays (GCRs) in the inner heliosphere. A
cross calibration between all sensors was performed for this study, which
can also be used in subsequent works. We investigate the stability of the
SREM detectors over long-term periods. The radiation data are compared
qualitatively and quantitatively with the corresponding solar activity.
Based on INTEGRAL and Rosetta SREM data, a GCR helioradial gradient of
2.96 % AU−1 is found between 1 and 4.5 AU. In addition, the data during the
last phase of the Rosetta mission around comet 67P/Churyumov–Gerasimenko
were studied in more detail. An unexpected yet unexplained 8 %
reduction of the Galactic Comic Ray flux measured by Rosetta SREM in the
vicinity of the comet is noted.
Different types of silver/graphite contact materials, all of them produced by extrusion, were tested by means of a model switch in order to get basic informations on welding resistance and contact erosion. The results are compared with those obtained from tests in circuits breakers, focusing especially on the behaviour of standard silver/graphite materials on the one hand and a new type of silver/graphite based on graphite fibres on the other. It was found that the new silverlgraphite material in a symmetric combination is markedly superior to conventional silver/graphite combinations with regard to contact erosion, welding resistance and overtemperature behaviour.
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