Suchergebnisse

Les propriétés de la production d'entropie par unité de temps (FORMULE) sont examinées pour quelques systèmes de réactions sans se limiter à l'approximation de lois phénoménologiques linéaires. En général, le théorème de la production d'entropie minimum ne reste pas valable lorsque l'état stationnaire se trouve loin de l'état d'équilibre thermodynamique. Toutefois l'auteur montre que même dans ce cas les propriétés caractéristiques de la production d'entropie ne sont pas entièrement perdues. Ainsi, suffisamment loin de l'état stationnaire, P ne peut que décroître quelle que soit la position de cet état stationnaire par rapport à l'équilibre.

Following the mathematical technique developed recently by Prof. Manneback, a calculation has been made which gives in the useful form of finite recurrence relations the transition moments for jumps between the various vibrational states within a fixed electronic level of a Morse anharmonic oscillator. The methods used up to now always involved a technique which does not give the required quantities in a closed form.

In a brief survey of the general econ situation in Jordan the author outlines the evolution of its econ system from a sheep & wheat based economy to one increasingly based upon commercial activities. The problems faced by a southern tribe are examined. The daughters of this group faced a change from seminomadic agri'al occup's to a sedentary commercial life. The modifications in family learning, work, leisure, & religion brought about by this change are described. The programs designed to meet this new state of affairs are examined. It is concluded that there should be: further educ for illiterate girls, direct & full preparation for marriage, playing fields, & sessions on soc training in the villages. Such educ measures meet the needs of the young women in the new situation. J. E. Hughes.

The Boltzmann-like approach to traffic flow leads to a singularity in the speed distribution function at a critical concentration. It is then shown that there exist two flow regimes which may be described as an individual flow regime and a collective flow regime. The flow versus concentration relation in the latter regime is independent of the desired speed distribution function. The existence of both metastable flow states and collective flow states for a given concentration is demonstrated for some cases. It is suggested that the stable flow pattern corresponds to the collective flow state because the latter involves the largest fluctuations.

A bstract. — The Poynting vector and the electric and magnetic energy densities of waves propagating in media exhibiting dispersion are calculated explicitly. It is shown that slight extensions of the conventional formulas are sufficient to take into account the modifications introduced by dispersion.