It is well-known that the spontaneous decay rates of emitting sources such as atoms or quantum wells can be largely modified in optical micro-cavities. − 4 Controlled spontaneous-emission plays a key role in a new generation of micro and nano-optical devices. Highperformance micro-cavity lasers, for instance, have been already experimentally demonstrated. 6 Spontaneous decay rates modifications...

Many Escherichia coli mRNAs are degraded by a 5'-end-dependent mechanism in which RppH-catalyzed conversion of the 5'-terminal triphosphate to a monophosphate triggers rapid endonucleolytic cleavage by RNase E. However, little is understood about what governs the decay rates of these transcripts. We investigated the decay of three such messages--rpsT P1, yfcZ, and ydfG--to characterize the rate...

in order to evaluate the allelopathic potential of sunflower (helianthus annus l.) organs on germination and growth of dodder (cuscuta compestris l.), series studies were conducted in three separate experiments; as factorial based on completely randomized design (crd) with three replications for each experiments. first experiment was conducted in petri dishes and consisted of sunflower organs a...

We revisit the problem of decay of a metastable vacuum induced by the presence of a particle. For the bosons of the 'master field' the problem is solved in any number of dimensions in terms of the spontaneous decay rate of the false vacuum, while for a fermion we find a closed expression for the decay rate in (1+1) dimensions. It is shown that in the (1+1) dimensional case an infrared problem o...

The question of classical topological stability of the gauge vortex defects is reanalyzed upon taking into account the quantum perturbative effects. The purely Abelian Higgs string remains stable while the coupling of the effectively Abelian Z-string (with the fixed zero upper component of the scalar doublet) to the fermions of the minimal standard model is shown to result in its decay, via the...

We study the Rabi oscillations decay of a spin decohered by a spin bath whose internal dynamics is caused by dipolar coupling between the bath spins. The form and rate of decay as a function of the intrabath coupling is obtained analytically, and confirmed numerically. The complex form of decay smoothly varies from power law to exponential, and the rate changes nonmonotonically with the intraba...

The decay rate of the 2v double beta decay is calculated. The effects of pairing, static quadrupole deformation, spin-isospin polarization, and the .6.33 isobar admixtures on the nuclear matrix elements are studied and the relation of the 2v {3{3 rate and the {3and f3+ strength is stressed. In agreement with other calculations, we predict a faster decay rate than has been observed experimentall...

The exact decay rate for emission of massless minimally coupled scalar elds by a non-extremal black hole in 2 + 1 dimensions is obtained. At low energy, the decay rate into scalars with zero angular momentum is correctly reproduced within conformal eld theory. The conformal eld theory has both left-and right-moving sectors and their contribution to the decay rate is associated naturally with le...

The exact decay rate for emission of massless minimally coupled scalar fields by a non-extremal black hole in 2 + 1 dimensions is obtained. At low energy, the decay rate into scalars with zero angular momentum is correctly reproduced within conformal field theory. The conformal field theory has both leftand rightmoving sectors and their contribution to the decay rate is associated naturally wit...

Several methods exist for adaptation to non-stationarystatistics in histogram modelling. Among the techniques that perform local adaptation by decaying histogram counts, we show that fixed decay rate schemes are sub-optimal. We use an order-0 model and an arithmetic coder to demonstrate that improved performance can be obtained by using a variable decay rate scheme that uses the derivative of t...