10,669 research outputs found
Theoretical analysis of direct violation and differential decay width in in phase space around the resonances and
We perform a theoretical study on direct violation in in phase space around the intermediate states and
. The possible interference between the amplitudes corresponding to
the two resonances is taken into account, and the relative strong phase of the
two amplitudes is treated as a free parameter. Our analysis shows that by
properly chosen the strong phase, both the violation strength and
differential decay width accommodate to the experimental results.Comment: 15 pages, 5 figure
A Submillimeter Burst of S255IR~SMA1 - The Rise And Fall Of Its Luminosity
Temporal photometric variations at near infrared to submillimeter wavelengths
have been found in low-mass young stellar objects. These phenomena are
generally interpreted as accretion events of star-disk systems with varying
accretion rates. There is growing evidence suggesting that similar luminosity
flaring also occurs in high-mass star/cluster-forming regions. We report in
this Letter the rise and fall of the 900 m continuum emission and the
newly found 349.1 GHz methanol maser emission in the massive star forming
region S255IR~SMA1 observed with the Submillimeter Array and the Atacama Large
Millimeter/submillimeter Array. The level of flux variation at a factor of
2 at the submillimeter band and the relatively short 2-year duration of
this burst suggest that the event is probably similar to those milder and more
frequent minor bursts seen in 3D numerical simulations.Comment: 8 pages, 4 figures, Accepted for publication in The Astrophysical
Journal Lette
Preflare very long-periodic pulsations observed in Halpha emission before the onset of a solar flare
Very long-periodic pulsations during preflare phases (preflare-VLPs) have
been detected in the full-disk solar soft X-Ray (SXR) flux (see Tan et al.
2016). They may be regarded as precursors to solar flares and may help us
better understand the trigger mechanism of solar flares. In this letter, we
report a preflare-VLP event before the onset of an M1.1 circular-ribbon flare
on 2015 October 16. It was simultaneously observed in Halpha, SXR, and extreme
ultraviolet (EUV) wavelengths, which were recorded by the NVST, GOES, EVE, and
AIA respectively. The preflare-VLP is identified as the repeat and
quasi-periodic pulses in light curves during preflare phase, which might be
modulated by LRC-circuit oscillation in the current-carrying plasma loop. The
quasi-periodicity can be determined from the Fourier power spectrum with Markov
chain Monte Carlo (MCMC)-based Bayesian (e.g., Liang et al. 2020), such as ~9.3
minutes. We present the first report of a preflare-VLP event in the local
Halpha line and EUV wavelength, which could be considered a precursor of a
solar flare. This finding should therefore prove useful for the prediction of
solar flares, especially for powerful flares.Comment: 4 pages, 4 figures, accepted by A&A Letters. The abstract was
rewritte
Clinical and Renal Biopsy Findings Predicting Outcome in Renal Thrombotic Microangiopathy: A Large Cohort Study from a Single Institute in China
Objective. The current study aimed to investigate the spectrum of etiologies and associated disorders of renal biopsy-proven thrombotic microangiopathy (TMA) patients. Methods. The clinical, laboratory, and renal histopathological data of patients with renal TMA from 2000 to 2012 in our institute were collected and reviewed. Results. One hundred and nine TMA patients were enrolled in this study. The mean age was 34.0 ± 11.1 years. Seventy patients (64.2%) were male and thirty-nine patients (35.8%) were female. There were eight patients (7.3%) with hemolytic uremic syndrome (HUS). Sixty-one patients (56.0%) were secondary to malignant hypertension. Fourteen patients (12.8%) were pregnancy-associated TMA. Other associated disorders included 17 patients with connective tissue disorders, 2 patients with hematopoietic stem cell transplantation, 4 patients with Castleman’s disease, 1 patient with cryoglobulinemia, and 2 patients with glomerulopathy. During followup, 8 patients died due to severe infection, 17 patients had doubling of serum creatinine, and 44 had end-stage renal disease. In multivariate analysis, male, elevated serum creatinine, and decreased hemoglobin were independently associated with poor renal outcomes. Conclusions. Renal TMA changes consisted of different disorders with various etiologies. aHUS, pregnancy-associated TMA, and malignant hypertension accounted for the majority of patients in our cohort
Hamiltonian type Lie bialgebras
We first prove that, for any generalized Hamiltonian type Lie algebra ,
the first cohomology group is trivial. We then show that
all Lie bialgebra structures on are triangular.Comment: LaTeX, 16 page
Global attractivity and permanence of a SVEIR epidemic model with pulse vaccination and time delay
AbstractIn this study, we propose a new SVEIR epidemic disease model with time delay, and analyze the dynamic behavior of the model under pulse vaccination. Pulse vaccination is an effective strategy for the elimination of infectious disease. Using the discrete dynamical system determined by the stroboscopic map, we obtain an ‘infection-free’ periodic solution. We also show that the ‘infection-free’ periodic solution is globally attractive when some parameters of the model under appropriate conditions. The permanence of the model is investigated analytically. Our results indicate that a large vaccination rate or a short pulse of vaccination or a long latent period is a sufficient condition for the extinction of the disease
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