1,606 research outputs found
Maximum pull out force on DNA hybrids
We discuss theoretically the force F between two colloidal particles, each of
them carrying one single strand DNA. The two strands are complementary only on
a finite sequence of consecutive base pairs. We define an adjustment length (a
few base pairs): in the adjustment regions near both ends of the paired region,
the tension is still mainly on one single strand. But in the central part, the
two backbones are equally loaded. This leads to a rupture force, increasing
linearly with length, and saturating for large lengths.Comment: 5 pages, 1 EPS figure. submitted C. R. Acad. Sci. (Paris
Performance assessment of heat pump systems in non-residential buildings by means of dedicated simulation models
Contribution of point sources to the soft gamma-ray Galactic emission
The nature of the soft gamma-ray (20-200 keV) Galactic emission has been a
matter of debate for a long time. Previous experiments have tried to separate
the point source contribution from the real interstellar emission, but with a
rather poor spatial resolution, they concluded that the interstellar emission
could be a large fraction of the total Galactic emission. INTEGRAL, having both
high resolution and high sensitivity, is well suited to reassess more precisely
this problem. Using the INTEGRAL core program Galactic Center Deep Exposure
(GCDE), we estimate the contribution of detected point sources to the total
Galactic flux.Comment: Proceedings of the 5th INTEGRAL Workshop, Munich 16-20 February 2004.
ESA SP-55
Critères de contraste déterministes pour la séparation de sources
- La séparation aveugle de sources est souvent menée sous l'hypopthèse que les sources sont statistiquement indépendantes. Cependant, cette hypothèse n'est pas indispensable, et peut être remplaçée par une hypothèse sur la distribution des sources, même si les sources sont identiquement distribuées. Les fonctions de contraste sont des critères d'optimisation qui jouissent de certaines propriétés d'identifiabilité. On définit ici une famille de fonctions de contraste adaptées aux sources discrètes. Parmi les avantages présentés par ces contrastes, on peut mentionner la possibilité de traiter des sources corrélées, ou déterministes
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