Software for the analysis of extreme events: The current state and future directions

The last few years have seen a significant increase in publicly available software specifically targeted to the analysis of extreme values. This reflects the increase in the use of extreme value methodology by the general statistical community. The software that is available for the analysis of extremes has evolved in essentially independent units, with most forming extensions of larger software environments. An inevitable consequence is that these units are spread about the statistical landscape. Scientists seeking to apply extreme value methods must spend considerable time and effort in determining whether the currently available software can be usefully applied to a given problem. We attempt to simplify this process by reviewing the current state, and suggest future approaches for software development. These suggestions aim to provide a basis for an initiative leading to the successful creation and distribution of a flexible and extensible set of tools for extreme value practitioners and researchers alike. In particular, we propose a collaborative framework for which cooperation between developers is of fundamental importance. AMS 2000 Subject Classification Primary—62P99     

Bericht über die 4. Tagung Steine und Erden in Aachen 29. und 30.4.54

Ohne ZusammenfassungDie Vorträge sollen ausführlich in den Fachzeitschriften: Tonindustriezeitung undZement, Kalk, Gips erscheinen.     

Dicyclopentadienylnickel-alkyne complexes: photochemical formation and mass spectra

Irradiation of toluence or n-hexanne solutions of dicyclopentadienyldicarbonyldinickel complexes at λ ? 350 nm gives good yields of bridged dinuclear complexes (RCCR′)(CpNi)₂. Their bonding and mass spectra are discussed.     

The electron—ion recombination coefficient in CO2 and NH3. Deviations from a linear density dependence at elevated pressures

The rate coefficient for electron—ion recombination at 292 K rises to a value of 7 x 10^?5 cm³ s^?1 in CO₂ at 13 x 10¹⁹ molecule cm^?3, but is non-linear with density above 8 x 10¹⁹ molecule cm^?3. In ammonia it passes through a definite maximum of 7 x 10^?5 cm³ s^?1 at 2.4 x 10¹⁹ molecule cm^?3     

Six-dimensional formulation of meson equations

The structure of the conformal group is studied by a generalisation of quaternion methods to six dimensions. Some simpleSO(4,2) covariant equations are shown to correspond to the Kemmer formulation for pseudoscalar and vector mesons, and the matrix elements of the irreducible representations of the Kemmer algebra are expressed as traces of products of Dirac matrices.