Enriched preference modeling and robustness analysis for the ELECTRE Tri-B method

Annals of Operations Research - We consider multiple criteria sorting problems with preference-ordered classes delimited by a set of boundary profiles. While significantly extending the ELECTRE...     

Photochemistry and spectroscopy at low-temperatures

Low-temperature photochemical experiments, using noble gases either as solid matrices or as liquid solvents, allow the generation of unstable fragments from parent transition metal organometallic compounds. Infrared spectroscopy is a particularly powerful technique for the identification and characterisation of these fragments.     

Chemical aspects of muon spin rotation

High energy muons induce radiation damage when they interact with molecules or ions. The chemical reactions expected to occur are summarised, and attention is then given to events likely to give rise to radicals exhibiting muon-electron hyperfine coupling. Addition of muonium atoms to double or treble bonds, which is one example of the way this can occur is considered, and, in particular, the resulting proton-muon hyperfine isotope effect is discussed. Finally, possible chemical models for paramagnetic muon centres in carbon and silicon are outlined.I thank Dr. S. Cox and Dr. A. Hill for helpful discussions.     

Convexities related to path properties on graphs

A feasible family of paths in a connected graph G is a family that contains at least one path between any pair of vertices in G. Any feasible path family defines a convexity on G. Well-known instances are: the geodesics, the induced paths, and all paths. We propose a more general approach for such ‘path properties’. We survey a number of results from this perspective, and present a number of new results. We focus on the behaviour of such convexities on the Cartesian product of graphs and on the classical convexity invariants, such as the Carathéodory, Helly and Radon numbers in relation with graph invariants, such as the clique number and other graph properties.     

Production of charged kaons by e+e− collisions between √s = 3.6 and 5 GeV

The total cross section for K^± production in e⁺e^? collisions was measured for cms energies between 3.6 and 5 GeV and was found to increase by a factor of 2–3 from 3.6 to 4.1 GeV.     

Bi−P Bond Homolysis as a Route to Reduced Bismuth Compounds and Reversible Activation of P4

Bismuth diphenylphosphanides Bi(NON^R)(PPh₂) (NON^R=[O(SiMe₂NR)₂], R=tBu, 2,6‐iPr₂C₆H₃, Aryl) undergo facile decomposition via single‐electron processes to form reduced Bi and P species. The corresponding derivatives Bi(NON^R)(PCy₂) are stable. Reaction of the isolated Bi^II radical ^.Bi(NON^Ar) with white phosphorus (P₄) proceeds with the reversible and selective activation of a single P?P bond to afford the bimetallic μ,η^1:1‐bicyclo[1.1.0]tetraphosphabutane compound.     

Homogeneous photochemical oxidation via singlet O2 in supercritical CO2

This communication describes the reaction chemistry of singlet oxygen in supercritical carbon dioxide, demonstrating rapid and quantitative conversion of alpha-terpinene to ascaridole.