2,800 research outputs found
Weak Poincar\'e Inequality for Convolution Probability Measures
By using Lyapunov conditions, weak Poincar\'e inequalities are established
for some probability measures on a manifold . These results are further
applied to the convolution of two probability measures on . Along with
explicit results we study concrete examples
Ionosphere/Plasmasphere sounding with ground and space-based GNSS observations
Applying a methodology developed and tested in
previous studies, the contribution from the ionospheric and
plasmaspheric regions to the total electron content (measured by
ground receivers) is analyzed. The method is based in the
electron density profiles retrieved from radio occultations
observed with low Earth orbit satellites, combined with an
accurate empirical modeling of the topside-ionosphere electron
density. The results of a climatological study of the fractional
electron content from the ionospheric region are presented for a
year of low solar activity. It is shown that a simple parametric
model can be used to reproduce the electron content variations in
the ionosphere and the plasmasphere between sunrise and
midday, the period of the day showing the largest electron
content variability.Peer ReviewedPostprint (author's final draft
Generalized Synchronization of Stochastic Discrete Chaotic System with Poisson Distribution Coefficient
This paper addresses the generalized synchronization of stochastic discrete chaotic systems with Poisson distribution coefficient. Firstly, based on the orthogonal polynomial approximation theory of discrete random function in Hilbert spaces, the discrete chaotic system with random parameter is transformed into its equivalent deterministic system. Secondly, a general method for the generalized synchronization of discrete chaotic system with random parameter is presented by Lyapunov stability theory and contraction theorem. Finally, two synchronization examples numerically illustrated that the proposed control scheme is effective for any stochastic discrete system
Heavy quarkonium production through the top quark rare decays via the channels involving flavor changing neutral currents
In the paper, we discuss the possibility of observation of heavy quarkoniums
via the processes involving flavor changing neutral currents (FCNC). More
explicitly, we systematically calculate the production of heavy charmonium and
-quarkonium through the top quark semi-exclusive rare FCNC decays
in the framework of the non-relativistic QCD (NRQCD) factorization theory. Our
results show that the total decay widths GeV, GeV, GeV, and GeV, where the
uncertainties are from variation of quark masses and renormalization scales.
Even though the decay widths are small, it is important to make a systematic
study on the production of charmonium and -quarkonium through the
top-quark decays via FCNC in the Standard Model, which will provide useful
guidance for future new physics research from the heavy quarkonium involved
processes.Comment: 17 pages, 8 figures and 6 tables, to be published in European
Physical Journal C. arXiv admin note: text overlap with arXiv:1304.1303 by
other author
Statistical Origin of Constituent-Quark Scaling in the QGP hadronization
Nonextensive statistics in a Blast-Wave model (TBW) is implemented to
describe the identified hadron production in relativistic p+p and
nucleus-nucleus collisions. Incorporating the core and corona components within
the TBW formalism allows us to describe simultaneously some of the major
observations in hadronic observables at the Relativistic Heavy-Ion Collider
(RHIC): the Number of Constituent Quark Scaling (NCQ), the large radial and
elliptic flow, the effect of gluon saturation and the suppression of hadron
production at high transverse momentum (pT) due to jet quenching. In this
formalism, the NCQ scaling at RHIC appears as a consequence of non-equilibrium
process. Our study also provides concise reference distributions with a least
chi2 fit of the available experimental data for future experiments and models.Comment: 4 pages, 3 figures; added two tables, explained a little bit more on
TBW_p
Exponential contraction in Wasserstein distance on static and evolving manifolds
In this article, exponential contraction in Wasserstein distance for heat semigroups of diffusion processes on Riemannian manifolds is established under curvature conditions where Ricci curvature is not necessarily required to be non-negative. Compared to the results of Wang (2016), we focus on explicit estimates for the exponential contraction rate. Moreover, we show that our results extend to manifolds evolving under a geometric flow. As application, for the time-inhomogeneous semigroups, we obtain a gradient estimate with an exponential contraction rate under weak curvature conditions, as well as uniqueness of the corresponding evolution system of measures
Luteoloside Inhibits Proliferation of Human Chronic Myeloid Leukemia K562 Cells by Inducing G2/M Phase Cell Cycle Arrest and Apoptosis
Purpose: To investigate the effects of luteoloside on the proliferation of human chronic myeloid leukemia K562 cells and whether luteoloside induces cell cycle arrest and apoptosis in K562 cells.Methods: Luteoloside’s cytotoxicity was assessed using a cell counting kit. Cell cycle distribution was analysed by flow cytometry after propidium iodide (PI) staining. Cell apoptosis was assayed with apoptosis detection kit and Hoechst staining followed by observation under a fluorescence microscope. The expression of cell cycle- and apoptosis-related proteins was examined by Western blot analysis.Results: Luteoloside inhibited the proliferation of K562 cells in a dose- and time- dependent manner (IC50 = 30.7 μM) with less toxicity in a normal human cell line (IC50 = 91.8 μM). Moreover, antiproliferative effect of luteoloside was accompanied with G2/M phase arrest(p < 0.05 or p<0.01) and apoptosis(p < 0.01 or p < 0.001). Further studies revealed that the expression level of cyclinB1 was down-regulated by luteoloside treatment. Furthermore, luteoloside treatment also increased proapoptotic protein Bax expression and decreased anti-apoptotic protein Bcl-2 expression.Conclusion: These results suggest that the inhibitory effect of luteoloside on K562 cell proliferation is associated with inducing G2/M phase arrest and apoptosis, and that luteoloside is worth further studying for anticancer potential.Keywords: Luteoloside, Myeloid leukemia, Proliferation, Cell cycle arrest, Apoptosis, Anticance
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