Thermal high pressure hydrogenolysis II. The thermal high pressure hydrocracking of fluorene

The thermal hydrocracking of fluorene was investigated in the temperature range of 400 to 480 °C and hydrogen pressures of up to 375 atm. As main reaction products were found 2-methylbiphenyl, biphenyl, toluene and benzene. They account for about 90% of the converted fluorene. Only very low concentrations of diphenylmethane were detected at the highest temperature. This indicates that the opening of the phenyl - CH2 bond in fluorene is much faster than the splitting of the phenyl - phenyl bond. The splitting of the phenyl - phenyl bond in biphenyl, however, proceeded with a rate equal to the splitting of the phenyl - CH2 bond in fluorene and the phenyl - CH3 bond in 2-methylbiphenyl

Les comportements face au VIH et autres IST des travailleuses et travailleurs du sexe en Suisse : Enquête SWAN 2016

Pour la première fois en 2016, une enquête a été menée auprès des travailleuses et des travailleurs du sexe (TS) exerçant en Suisse. Cette étude, nommée SWAN (Sex Workers ANswers), s’inscrit dans le dispositif de surveillance du VIH et des autres IST en Suisse, établi par l’Office fédéral de la santé publique. Les critères d’inclusion pour participer à cette enquête comprenaient toute personne (hommes, femmes, personnes transgenres et intersexe) ayant 18 ans ou plus et ayant eu des rapports sexuels en échange d’argent au cours des douze mois précédent l’enquête en Suisse. Deux stratégies complémentaires d’administration du questionnaire ont été mises en œuvre : un questionnaire Internet auto-administré et un questionnaire disponible sur une tablette numérique administré soit en face-à-face soit par les TS seul-e-s. Le questionnaire était entièrement anonyme et les données ont été traitées de manière confidentielle. La plateforme électronique d’hébergement du questionnaire était dotée du « responsive design » (format du questionnaire s’adaptant automatiquement aux ordinateurs fixes, aux tablettes numériques et aux Smartphones) et le questionnaire était disponible en sept langues : français, allemand, anglais, portugais, espagnol, roumain et hongrois. Le recrutement a principalement été réalisé par l’intermédiaire de professionnel-le-s du terrain (membres du réseau APiS, intervenant-e-s, médiateur et médiatrices, travailleurs et travailleuses sociaux) formé-e-s à l’utilisation de tablettes et à la passation du questionnaire

Mechanism of hydroformylation, part II : Study of the formation of hydrocobalttetracarbonyl by the reaction of Co2(CO)8 and H2

The kinetics and the position of the equilibrium of the reaction Co2(CO)8+H2⇄2 HCo(CO)4 were studied in the range of 80–160 °C and 50–100 atm. by means of in situ IR spectroscopy.\ud \ud The reaction is reversible first order with respect to CO2(CO)8 and HCo(CO)4 and the energies of activation of the forward and the reverse reaction are found to be 17,3 cal/mole, and 11.0 kcal/mole resp.\ud \ud The reaction is slightly endothermic with ΔH=6.6 kcal/mole and ΔS=14.6 e.u. The heat of formation of HCo(CO)4 and the bond strength between hydrogen and cobalt in HCo(CO)4 were found to be—146.1 kcal/mole and 54.7 kcal/mole resp

Stationary Einstein-Maxwell fields in arbitrary dimensions

The Einstein-Maxwell equations in D-dimensions admitting (D-3) commuting Killing vector fields have been investigated. The existence of the electric, magnetic and twist potentials have been proved. The system is formulated as the harmonic map coupled to gravity on three-dimensional base space generalizing the Ernst system in the four-dimensional stationary Einstein-Maxwell theory. Some classes of the new exact solutions have been provided, which include the electro-magnetic generalization of the Myers-Perry solution, which describes the rotating black hole immersed in a magnetic universe, and the static charged black ring solution.Comment: 26 page

Simulation of heat transport in low-dimensional oscillator lattices

The study of heat transport in low-dimensional oscillator lattices presents a formidable challenge. Theoretical efforts have been made trying to reveal the underlying mechanism of diversified heat transport behaviors. In lack of a unified rigorous treatment, approximate theories often may embody controversial predictions. It is therefore of ultimate importance that one can rely on numerical simulations in the investigation of heat transfer processes in low-dimensional lattices. The simulation of heat transport using the non-equilibrium heat bath method and the Green-Kubo method will be introduced. It is found that one-dimensional (1D), two-dimensional (2D) and three-dimensional (3D) momentum-conserving nonlinear lattices display power-law divergent, logarithmic divergent and constant thermal conductivities, respectively. Next, a novel diffusion method is also introduced. The heat diffusion theory connects the energy diffusion and heat conduction in a straightforward manner. This enables one to use the diffusion method to investigate the objective of heat transport. In addition, it contains fundamental information about the heat transport process which cannot readily be gathered otherwise.Comment: Article published in: Thermal transport in low dimensions: From statistical physics to nanoscale heat transfer, S. Lepri, ed. Lecture Notes in Physics, vol. 921, pp. 239 - 274, Springer-Verlag, Berlin, Heidelberg, New York (2016

Role of electromagnetically induced transparency in resonant four-wave-mixing schemes.

Published versio

Continuously improving the practice of cardiology

Guidelines for the management of patients with cardiovascular disease are designed to assist cardiologists and other physicans in their practice. Surveys are conducted to assess whether guidelines are followed in practice. The results of surveys on acute coronary syndromes, coronary revascularisation, secondary prevention, valvular heart disease and heart failure are presented. Comparing surveys conducted between 1995 and 2002, a gradual improvement in use ofsecondary preventive therapy is observed. Nevertheless, important deviations from established guidelines are noted, with a significant variation among different hospitals in the Netherlands and in other European countries. Measures for fiuther improvement of clinical practice indude more rapid treatment of patients with evolving myocardial infarction, more frequent use of clopidogrel and glycoprotein IIb/IIIa receptor blockers in patients with acute coronary syndromes, more frequent use of 5-blockers in patients with heart failure and more intense measures to encourage patients to stop smoking. Targets for the proportion ofpatients who might receive specific therapies are presented