The aim of this work is to identify the mechanisms responsible for very large rates and other peculiarities observed in low-energy positron annihilation on molecules. The two mechanisms considered are: (i) Direct annihilation of the incoming positron with one of the molecular electrons. This mechanism dominates for atoms and small molecules. I show that its contribution to the annihilation rate...

BACKGROUND Transcranial direct current stimulation (tDCS) has been shown to perturb both cortical neural activity and hemodynamics during (online) and after the stimulation, however mechanisms of these tDCS-induced online and after-effects are not known. Here, online resting-state spontaneous brain activation may be relevant to monitor tDCS neuromodulatory effects that can be measured using ele...

The marked Increase In electrical resistance occurring at temperatures above melting can be explained by assuming a vaporizaf on, expansion wave proceeding radially inward from the wire surface. This wave reduces the conducting cross section of the wire, thereby increasing the resistance. For wires well matched to the circuit the resistance rise occurs when the condenser voltage is practically ...

The existence of the top quark has been established in March 1995 by the CDF and DØ collaborations at the Tevatron collider. [1]. Top quark has been discovered in the strong tt̄ pair production mode. The cross section of electroweak process of single top quark was found to be comparable with the QCD pair top production [2]. Single top production mechanism is the independent way of a confirmation...

In this paper, we study the linear quadratic Nash games for infinite horizon singularly perturbed systems. In order to solve the problem, we must solve a pair of cross–coupled algebraic Riccati equations with a small positive parameter ε. As a matter of fact, we propose a new algorithm, which combines Lyapunov iterations and the generalized Lyapunov equation direct method, to solve the cross–co...

To leading order in the baryon density, the properties of vector mesons in nuclear matter are determined by the vectormeson nucleon scattering amplitudes. Since these amplitudes are not directly constrained by data, there are presently large theoretical ambiguities in predictions of the vector-meson spectral densities in nuclear matter. We address this problem by implementing the constraints fr...

BACKGROUND Gynocomastia is a relatively common condition in men, with a reported overall incidence of 32% to 36% and as high as 65% among adolescent males in some series. OBJECTIVE We reviewed the senior surgeon's experience over the past decade in the surgical treatment of gynecomastia using suction-assisted lipoplasty (SAL) with a cross-chest tunneling technique, performed alone or in combi...

Methods During 3-moths cross-sectional study in 30 centers of RUS the data of 1099 consecutive patients were collected. The following key determinants of disease activity were examined: numbers of tender, swollen joints; number of active joint and joints with patient assessment of pain and global health scores (VAS); ESR; DAS 28; JADAS-71, PhGloVAS. Relationship between studied variables was in...

Interaction of the Tramtrack protein from Drosophila melanogaster with DNA was analyzed by a cross-linking method. Tramtrack residues cross-linkable to the partially depurinated DNA were identified by direct sequencing. The N-terminal alpha-amino group of the protein DNA-binding domain was found to be the major product of cross-linking. The location of the N terminus on the DNA was determined b...