The addition of methylborylene to acetylenes

The synthesis of alkyl-substituted 1,4-dimethyl-1,4-diboracyclohexa-2,5-dienes from dialkylacetylenes and the system C₈K/MeBBr₂ is described.     

Transferability of dipole moment derivatives: Calculation of absolute rotational contributions for symmetrical molecules

It is shown that Polo's method for the calculation of the D^?1 and G^?1 matrices can be extended to the calculation of the absolute rotational contributions involved in the molecular dipole moment derivatives in terms of symmetry coordinates. The method applies to both stretching and bending modes. The method is outlined for AB₃ (C_3v) molecules.     

Synthesis of quinoline and benzo[b]thiophene derivatives by ring annelation of pyridines and thiophenes

Selected ortho-disubstituted pyridines and thiopenes react with Michael acceptors to give functionalized quinolines or benzo[b]thiopenes, respectively.     

Measurements of the second-sound velocity in dilute 3He4He mixtures

A Helmholtz resonator was used to measure the velocity of second sound in dilute solutions of ³He in ⁴He. The results are compared with values reported by Brubaker et al. and de Voogt et al.     

A study of the reactions208Pb(d,d)208Pb and208Pb(d,p)209Pb at energies above and below the Coulomb barrier

The reactions²⁰⁸Pb(d, d)²⁰⁸Pb and²⁰⁸Pb(d, p)²⁰⁹Pb have been studied in the energy region from below to above the Coulomb barrier. An optical-model analysis of the elastic scattering results has been performed to obtain parameters for a DWBA analysis. Distorted wave calculations for the direct transitions leading to single-particle states in²⁰⁹Pb have been used to extract spectroscopic factors. Only two deuteron potential sets give a good account of the stripping data throughout the energy region studied.     

Un modèle stochastique pour l'étude du bruit de fond dans un réacteur contrôlé par un dispositif de réglage automatique

Résumé On essaie de trouver l'équation du mouvement de la barre de contrôle d'un réacteur en théorie ponctuelle à un groupe de neutrons retardés à partir des principes stochastiques.     

On the time dependent behaviour of the truncated birth-death process

Conditions are obtained for the truncated birth-death process to be stochastically monotone in the long run.     

Dispersion interactions between unexcited molecules possessing axial symmetry: Arbitrary-order contributions

The ground-state dispersion energy of a pair of axially symmetric molecules is calculated, to arbitrary order in the inverse intermolecular separation, on the basis of London's anisotropic oscillator model.