Nonequilibrium work distribution of a quantum harmonic oscillator

We analytically calculate the work distribution of a quantum harmonic oscillator with arbitrary time-dependent angular frequency. We provide detailed expressions for the work probability density for adiabatic and nonadiabatic processes, in the limit of low and high temperature. We further verify the validity of the quantum Jarzynski equalityComment: 6 pages, 3 figure

Effects of Microgravity on Articular Cartilage - Space Flight Research investigates the Role of Mechanical Loading for Cartilage Health

Articular cartilage is essential for unconfined function of the musculoskeletal system. Because it is a bradytroph tissue, normal mechanical loading, as experienced in daily life, is essential for cartilage health. The effect of reduced mechanical loading, e.g through immobilization or microgravity, is not completely understood. Because of the slow rate of metabolism of cartilage, the time line for intervention experiments needs to be longer than for other skeletal tissues and the regenerative capacity of cartilage is very limited, once degradation occurs. Thus performing unloading experiments in healthy humans is difficult. A few studies have been performed in patient cohorts that experienced unloading due to injury and the results suggest that human cartilage health is negatively affected by unloading. Space flight research offers a unique opportunity to investigate musculoskeletal tissue adaptation to immobilization either in bed rest or space flight experiments in healthy individuals. Data on cartilage health are sparse but suggest that it is necessary to assess the risk of cartilage deconditioning during extensive human space travel. Results from this context offer the unique possibility to broaden our understanding of the role of mechanical loading for tissue health and will provide important information for patients suffering from immobilization periods due to injury or disease

Discussion du projet de résolution présenté par le comité des subsistances, lors de la séance du 6 juillet 1789

Hébrard de Fau Pierre, Blandin Liphard. Discussion du projet de résolution présenté par le comité des subsistances, lors de la séance du 6 juillet 1789. In: Archives Parlementaires de 1787 à 1860 - Première série (1787-1799) Tome VIII - Du 5 mai 1789 au 15 septembre 1789. Paris : Librairie Administrative P. Dupont, 1875. pp. 194-195

Polycyclische aromatische Kohlenwasserstoffe in Boeden und Pflanzen. Ein Beitrag zur Gefaehrdungsabschaetzung bei Altlasten. Bd. 1 Untersuchungsverfahren

The assessment of environmental hazards emanating from a group of pollutants presupposes, inter alia, knowledge of their quantities. To establish these requires a reliable analytical method for the qualitative and quantitative determination of the groups of organic pollutants to be investigated. In the case of polycyclic aromatic hydrocarbons the task set was to develop methods permitting to reliably determine PAH concentrations in soil and plants routinely. (orig.)Die Abschaetzung der von einer Schadstoffgruppe ausgehenden Umweltgefaehrdung setzt u.a. die Kenntnis der vorhandenen Mengen voraus. Ihre Ermittlung erfordert ein zuverlaessiges analytisches Verfahren zur qualitativen und quantitativen Bestimmung der jeweils interessierenden Gruppe organischer Schadstoffe. Im Falle der polycyclischen aromatischen Kohlenwasserstoffe galt es, Methoden zu entwickeln, die es im Routineeinsatz gestatten, zuverlaessig die PAK-Konzentrationen in Boeden und Pflanzen zu ermitteln. (orig.)Available from TIB Hannover: RA 8195(41) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman