Concept

Mort thermique de l'Univers

Publications associées (32)

Scale invariance, unimodular gravity and dark energy

We demonstrate that the combination of the ideas of unimodular gravity, scale invariance, and the existence of an exactly massless dilaton leads to the evolution of the universe supported by present observations: inflation in the past, followed by the radi ...

2009

Classical big-bounce cosmology: dynamical analysis of a homogeneous and irrotational Weyssenhoff fluid

Sylvain Bréchet

A dynamical analysis of an effective homogeneous and irrotational Weyssenhoff fluid in general relativity is performed using the 1 + 3 covariant approach that enables the dynamics of the fluid to be determined without assuming any particular form for the s ...

Institute of Physics2008

The theta parameter in loop quantum gravity: effects on quantum geometry and black hole entropy

Danilo Jimenez Rezende

The precise analog of the theta-quantization ambiguity of Yang-Mills theory exists for the real SU(2) connection formulation of general relativity. As in the former case theta labels representations of large gauge transformations, which are super-selection ...

2008

Comportement au jeune âge et différé d'un BFUP écrouissant sous les effets thermomécaniques

Aicha Kamen

This thesis is dedicated to study the early age behavior and time dependant as well as the thermo-mechanical response under restraint of a hardening Ultra High Performance Fiber Reinforced Concrete (UHPFRC). The knowledge of the UHPFRC behavior is indispen ...

EPFL2007

Cubic and oriented Ag nano-particles by high vacuum evaporation

Libero Zuppiroli, Detlef Berner

Ag cubes of uniform size (70nm) and self-assembled into two dimensional arrays are formed by physical vapor deposition. The formation of the Ag cubes depends critically on the substrate composition. While heat dissipation can control the crystallization of ...

Nano Science and Technology Institute, Cambridge, MA 02139, United States2006

Measurement of the cross section of W-boson pair production at LEP

Aurelio Bay

The cross section of W-boson pair-production is measured with the L3 detector at LEP. In a data sample corresponding to a total luminosity of 629.4 pb-1, collected at centre-of-mass energies ranging from 189 to 209 GeV, 9834 four-fermion events with W boso ...

2004

Thermodynamic analysis of growth of Methanobacterium thermoautotrophicum

Urs von Stockar

Growth of Methanobacterium thermoautotrophicum, an anaerobic archaebacterium using methanogenesis as the catabolic pathway, is characterized by large heat prodn. rates, up to 13 W g-1, and low biomass yields, in the order of 0.02 C-mol mol-1 H2 consumed. T ...

1999

Monitoring synchronized oscillating yeast cultures by calorimetry

Urs von Stockar

Synchronized oscillating cultures of Saccharomyces cerevisiae CBS 426 exhibit periodic oxidoreductive metab. The changing metab. is detectable by in situ heat-flux calorimetry in the BSC 81, which was operated as a chemostat in these expts. The measured me ...

1993

The heat generated by yeast cultures with a mixed metabolism in the transition between respiration and fermentation

Urs von Stockar

The heat generated by both batch and continuous cultures of the yeast Kluyveromycs fragilis was studied using a modified bench scale calorimeter. Batch cultures were used to measure the heat dissipation rates and the heat yields during fully aerobic and co ...

1989

Application of bench-scale calorimetry to chemostat cultures

Urs von Stockar

The use of the heat-flux calorimeter BSC-81 as a chemostat is described. The technique was applied to study the heat generation rate by continuous cultures of the yeast Kluyveromyces fragilis NRRL 1109 as a function of specific growth rate. The maintenance ...

1989

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