Perturbations to Markov chains and Markov processes are considered. The unperturbed problem is assumed to be geometrically ergodic in the sense usually established through the use of Foster–Lyapunov drift conditions. The perturbations are assumed to be uniform, in a weak sense, on bounded time intervals. The long-time behavior of the perturbed chain is studied. Applications are given to numeric...

We study the entanglement spectrum of Heisenberg spin ladders of arbitrary spin length S in the perturbative regime of strong rung coupling. For isotropic spin coupling the the entanglement spectrum is, within first order perturbation theory, always proportional to the energy spectrum of the single chain with a proportionality factor being also independent of S. A more complicated situation ari...

Perturbations to Markov chains and Markov processes are considered. The unperturbed problem is assumed to be geometrically er-godic in the sense usually established through use of Foster-Lyapunov drift conditions. The perturbations are assumed to be uniform, in a weak sense, on bounded time intervals. The long-time behaviour of the perturbed chain is studied. Applications are given to numerical...

We study the average density of resonances (DOR) for a semi-infinite disordered chain, coupled to the outside world by a (semi-infinite) perfect lead. A set of equations is derived, which provides the general framework for calculating the average DOR, for an arbitrary disorder and coupling strength. These general equations are applied to the case of weak coupling and an asymptotically exact exp...

In today’s world, Supply Chain Management (SCM) plays a key strategic role in increasing organizational effectiveness and accomplishment of organizational goals such as enhanced competitiveness, better customer service and increased profitability. The process of choosing appropriate supply chain performance measures is difficult due to the complexity that various processes are linked with each ...

The behavior of a single polyethylene chain grafted to an impenetrable surface, under shear flow, is investigated using Brownian dynamics simulations. Both short-range conformational energies and excluded volume effects are included in the model. Simulations are performed in good and poor solvent conditions in order to explore the effect of solvent quality. The shear flow is represented by the ...

Motion sickness typically occurs when the body is subjected to externally imposed motions, but there are situations in which sickness occurs in the absence of imposed motion. We report a new and unanticipated instance of the latter. Subjects in a study of spontaneous standing postural sway sometimes reported dizziness and motion sickness. Reports of sickness were correlated with changes in post...

TCRb, d and c chain genes are assembled and expressed in double-negative thymocytes prior to ab or cd T cell lineage commitment. Thus, cells committed to the ab T cell lineage can possess completely assembled TCRd and/or TCRc chain genes. However, these genes are not expressed. TCRc chain gene expression may be silenced through the activity of a cis-acting silencer element. In the TCRa/d locus,...

The effects of dipoles and aromatic amino acid side-chain models on the absorption and optical activity of the rhodopsin chromophore were calculated by using perturbation theory, and the results were compared with those of a Pariser-Parr-Pople calculation for the unperturbed system. The interaction was assumed to result from purely electrostatic interactions. It was concluded that the side chai...