855 research outputs found
Evaluation of the reactivity of ultra-lean PRF/air mixtures by weak flames in a micro flow reactor with a controlled temperature profile
Impact of Different Thymic Pathologies on the Clinical Course of Myasthenia Gravis : A Population Wide Study in Latvia
Publisher Copyright: © 2015 by Anete Zieda.Myasthenia gravis (MG) is an autoimmune disease characterized by autoantibody mediated postsynaptic failure of neuromuscular transmission. The thymus gland has a role in the pathogenesis of MG. The aim of this study was to determine (1) the prevalence of different thymic pathologies in the MG patient population of Latvia; (2) the potential impact of different thymus pathologies on the clinical course of MG; and (3) the effectiveness of surgical treatment of thymic pathologies in Latvia. The results showed that the most common thymus pathology among the patients with MG in Latvia is thymoma. Compared to the published data, the proportion of MG patients diagnosed with thymus hyperplasia in Latvia is very small. Thymus hyperplasia is uncommon among patients 60 years of age and older. MG onset for patients with thymoma is significantly later than that of patients with thymus hyperplasia. Almost all patients with thymoma or thymus hyperplasia develop a generalised form of MG. The presence of a thymus pathology does not significantly affect the electrophysiological test results, clinical symptom severity, frequency of disability or hospitalisation of the patients with MG. Thymectomy in patients with thymoma or thymus hyperplasia has no significant effect on relieving MG symptoms.publishersversionPeer reviewe
Statistical mechanics of spatial evolutionary games
We discuss the long-run behavior of stochastic dynamics of many interacting
players in spatial evolutionary games. In particular, we investigate the effect
of the number of players and the noise level on the stochastic stability of
Nash equilibria. We discuss similarities and differences between systems of
interacting players maximizing their individual payoffs and particles
minimizing their interaction energy. We use concepts and techniques of
statistical mechanics to study game-theoretic models. In order to obtain
results in the case of the so-called potential games, we analyze the
thermodynamic limit of the appropriate models of interacting particles.Comment: 19 pages, to appear in J. Phys.
Measurement of the decay width of He
We have precisely measured decay width of \5LHe and
demonstrated significantly larger - overlap than expected
from the central repulsion - potential, which is derived from
YNG \Lambda$-nucleon interaction.Comment: 4 pages, 3 figure
Exclusive Measurement of the Nonmesonic Weak Decay of ^{5}_{\Lambda}He Hypernucleus
We performed a coincidence measurement of two nucleons emitted from the
nonmesonic weak decay (NMWD) of ^{5}_{\Lambda}He formed via the
^{6}Li(\pi^+,K^+) reaction. The energies of two nucleons and the pair number
distributions in the opening angle between them were measured. In both np and
nn pairs, we observed a clean back-to-back correlation coming from the two-body
decay of \Lambda p --> n p and \Lambda n --> n n, respectively. The ratio of
the nucleon pair numbers was N_{nn}/N_{np}=0.45 \pm 0.11(stat)\pm 0.03(syst) in
the kinematic region of cos(theta_{NN}) < -0.8. Since each decay mode was
exclusively detected, the measured ratio should be close to the ratio of
\Gamma(\Lambda p --> np)/\Gamma(\Lambda n --> nn).
The ratio is consistent with recent theoretical calculations based on the
heavy meson/direct quark exchange picture.Comment: Submitted to Phys. Rev. lett., 4 pages, 3 figure
Proton asymmetry in non-mesonic weak decay of light hypernuclei
We have obtained the decay asymmetry parameters in non-mesonic weak decay of
polarized Lambda-hypernuclei by measuring the proton asymmetry. The polarized
Lambda-hypernuclei, 5_Lambda-He, 12_Lambda-C, and 11_Lambda-B, were produced in
high statistics via the (pi^+,k^+) reaction at 1.05 GeV/c in the forward
angles. Preliminary analysis shows that the decay asymmetry parameters are very
small for these s-shell and p-shell hypernuclei.Comment: 4pages, 4figures, International Conference on Hypernuclear and
Strange Particle Physics (HYP2003
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