Showing papers by "University of Mons published in 1977"
TL;DR: In this article, the magnetic field for an exact gauge group H (assumed compact and connected) exhibits an inverse square law behaviour at large distances, and the generalized magnetic charge, appearing as the coefficient, completely determines the topological quantum number of the solution.
752 citations
TL;DR: The reproducibility of the abundance ratios indicates that they may be used to characterize the structural identity or non-identity of non-decomposing monocharged positive ions as mentioned in this paper.
Abstract: Competitive fragementations of doubly charged ions formed by charge stripping have been observed for some hydrocarbon ions. The reproducibility of the abundance ratios indicates that they may be used to characterize the structural identity or non-identity of non-decomposing monocharged positive ions.
39 citations
TL;DR: In this article, the collision induced dissociation spectra of ions generated by ionization or fragmentation of various samples reveal at least five nondecomposing structures and carbon monoxide loss from the metastable ions are in agreement with the occurrence of a common reactive species.
Abstract: The collision induced dissociation spectra of ions generated by ionization or fragmentation of various samples reveal at least five non-decomposing structures. In contrast, the kinetic energy release measurements for the loss of carbon monoxide from the metastable ions are in agreement with the occurrence of a common reactive species. Isomerization into an ‘α,β-unsaturated aldehyde-like’ structure prior to fragmentation is proposed to accommodate these collision induced dissociation and mass analysed ion kinetic energy data. Some resuts suggest also that carbon monoxide loss from the phenol molecular ion may not occur via the cyclohexadienone tautomer.
31 citations
TL;DR: In this paper, a numerical analysis of finite amplitude convection in a two-component fluid taking into account thermal diffusion is presented, where the nonlinear equations with free boundary conditions are integrated numerically.
20 citations
TL;DR: Completely inactivated diphtheria toxin is a good toxin antagonist for HeLa cells binding sites indicating that the integrity of its fragment B is preserved, and this methylated toxin however can still bind NAD and seems to possess a functional fragment B.
12 citations
TL;DR: In this article, all spherically symmetric magnetic poles are explictly constructed in SU(4) and it is shown that while the total strength of the pole is always quantized its projection along the Higgs field is sometimes arbitrary.
Abstract: All spherically symmetric magnetic poles are explictly constructed in SU(4). We show the relevance of the concept of the little group which transforms spherically symmetric solutions among themselves. Unlike the SU(2) and SU(3) situation this little group is not always Abelian in SU(4). On the other hand, it is shown that while the total strength of the pole is always quantized its projection along the Higgs field is sometimes arbitrary. This is also in contrast with the SU(2) and SU(3) cases.
11 citations
TL;DR: In this article, a complete set of solutions of SU(4) invariant gauge fields with SO (4) spherical symmetry (euclidian metric in space time) is obtained.
5 citations
TL;DR: In this paper, the linear stability of the pipe Poiseuille flow including viscous heating was investigated with respect to axisymmetric disturbances, assuming no temperature fluctuations, under the assumption that no temperature fluctuation was present.
2 citations
TL;DR: In this article, the Si−H bond was cleaved in tetramethyldisiloxane, catalyzed by potassium hydroxide at 25°C, and the reaction was first order in the catalyst and in the silane, with the apparent kinetic constant varying with the inverse of the square root of the initial silane concentration.
Abstract: The rates of cleavage of the Si−H bond in penta-or tetramethyldisiloxane, catalyzed by potassium hydroxide have been studied in moist ethanol at 25°C. The reaction is first order in the catalyst and in the silane. The apparent kinetic constant varies with the inverse of the square root of the initial silane concentration. The mechanism involves either a fast equilibrium between hydroxide ion and the silane, followed by the approach ofa hydroxylated molecule in the rate-determining step, or a concerted attack on the silicon atom.
2 citations
TL;DR: In this article, the rates of cleavage of the Si−H bond of penta-and tetramethyldisiloxane have been studied, and the reaction is first order in the silane and in the dilute acid.
Abstract: The rates of cleavage of the Si−H bond of penta- and tetramethyldisiloxane have been studied. The reaction is first order in the silane and in the dilute acid. However, at high acid concentrations, the rate of reaction is governed by the acidity function of the system: this may indicate fast reversible proton transfer from the solvent to the organosilane in the rate-determining step.
2 citations