In this paper, different from previous studies, where only constant coupling are considered among the neurons, we primarily examine the effects of time periodic coupling on the dynamics of a scale-free network. To this end the effects of time-periodic coupling on the encoding of a subthreshold signal have been investigated depending on ion channel noise in a scale-free network (SF) consisting o...

Abstract We analyze the stress-energy tensor, and the resulting energy conditions, for a scalar field with general curvature coupling, outside a perfectly reflecting sphere with Dirichlet boundary conditions. For conformal coupling we find that the null energy condition is always obeyed, and therefore the averaged null energy condition (ANEC) is also obeyed. Since the ANEC is independent of cur...

INTRODUCTION Adulthood male hypogonadism (HG) is the most common form of HG. Although testosterone (T) replacement therapy (TRT) is the most common way of treating HG, other options are available depending on patient's needs and expectations. AREAS COVERED We analyze alternative options to TRT as a medical intervention in treating HG. Gonadotropin (Gn) therapy is the treatment of choice in me...

It is usually considered that the spectrum of an optical cavity coupled to an atomic medium does not exhibit a normal-mode splitting unless the system satisfies the strong coupling condition, meaning the Rabi frequency of the coherent coupling exceeds the decay rates of atom and cavity excitations. Here we show that this need not be the case, but depends on the way in which the coupled system i...

Integral transformations of the QCD invariant (running) coupling and of some related objects are discussed. Special attention is paid to the Fourier transformation, that is to transition from the space-time to the energy–momentum representation. The conclusion is that the condition of possibility of such a transition provides us with one more argument against the real existence of unphysical si...

Iterative aggregation{disaggregation (IAD) is an eeective method for solving nite nearly completely decomposable (NCD) Markov chains. Small perturbations in the transition probabilities of these chains may lead to considerable changes in the stationary probabilities; NCD Markov chains are known to be ill{conditioned. During an IAD step, this undesirable condition is inherited by the coupling ma...

We study a generic problem of dissipative quantum mechanics, a small local quantum system with discrete states coupled in an arbitrary way (i.e. not necessarily linear) to several infinitely large particle or heat reservoirs. For both bosonic or fermionic reservoirs we develop a quantum field-theoretical diagrammatic formulation in Liouville space by expanding systematically in the reservoirsys...