Electron-cyclotron maser and solar microwave millisecond spike emission

An intense solar microwave millisecond spike emission (SMMSE) event was observed on May 16, 1981 by Zhao and Jin at Beijing Observatory. The peak flux density of the spikes is high to 5 x 100,000 s.f.u. and the corresponding brightness temperature (BT) reaches approx. 10 to the 15th K. In order to explain the observed properties of SMMSE, it is proposed that a beam of electrons with energy of tens KeV injected from the acceleration region downwards into an emerging magnetic arch forms so-called hollow beam distribution and causes electron-cyclotron maser (ECM) instability. The growth rate of second harmonic X-mode is calculated and its change with time is deduced. It is shown that the saturation time of ECM is t sub s approx. equals 0.42 ms and only at last short stage (delta t less than 0.2 t sub s) the growth rate decreases to zero rather rapidly. So a SMMSE with very high BT will be produced if the ratio of number density of nonthermal electrons to that of background electrons, n sub s/n sub e, is larger than 4 x .00001

Canonical interpretation of Y(10750)Y(10750) and Υ(10860)\Upsilon(10860) in the Υ\Upsilon family

Inspired by the new resonance $Y(10750)$, we calculate the masses and two-body OZI-allowed strong decays of the higher vector bottomonium sates within both screened and linear potential models. We discuss the possibilities of $\Upsilon(10860)$ and $Y(10750)$ as mixed states via the $S-D$ mixing. Our results suggest that $Y(10750)$ and $\Upsilon(10860)$ might be explained as mixed states between $5S$- and $4D$-wave vector $b\bar{b}$ states. The $Y(10750)$ and $\Upsilon(10860)$ resonances may correspond to the mixed states dominated by the $4D$- and $5S$-wave components, respectively. The mass and the strong decay behaviors of the $\Upsilon(11020)$ resonance are consistent with the assignment of the $\Upsilon(6S)$ state in the potential models.Comment: 9 pages, 4 figures. More discussions are adde

Nonlocality-controlled interaction of spatial solitons in nematic liquid crystals

We demonstrate experimentally that the interactions between a pair of nonlocal spatial optical solitons in a nematic liquid crystal (NLC) can be controlled by the degree of nonlocality. For a given beam width, the degree of nonlocality can be modulated by varying the pretilt angle of NLC molecules via the change of the bias. When the pretilt angle is smaller than pi/4, the nonlocality is strong enough to guarantee the independence of the interactions on the phase difference of the solitons. As the pretilt angle increases, the degree of nonlocality decreases. When the degree is below its critical value, the two solitons behavior in the way like their local counterpart: the two in-phase solitons attract and the two out-of-phase solitons repulse.Comment: 3 pages, 4 figure

Effect of tirofiban on cardiac function, cardiomyocytes and inflammatory reaction in patients with acute myocardial infarction during emergency percutaneous coronary intervention

Purpose: To investigate the effect of tirofiban on cardiac function, cardiomyocytes and inflammatory reaction in acute myocardial infarction (AMI) patients during emergency percutaneous coronary intervention (PCI).Methods: Ninety AMI patients who underwent PCI for two years in Hanchuan Hospital, Hanchuan People's Hospital/Wuhan University People's Hospital, Hanchuan, China, were involved in this retrospective studies. Two groups were used (46 patients per group). The study group was treated with tirofiban, while the control group was without tirofiban exposure. Changes in brain natriuretic peptide (BNP), left ventricular end systolic diameter (LVESD) and left ventricular end diastolic diameter (LVEDD) were determined using a biochemical analyzer, while the inflammatory cytokines i.e. interleukin -6 (IL-6), tumor necrosis factor (TNF-) and high sensitive C reactive protein (hs-CRP) were assayed with ELISA kits.Results: One week after operation, a significantly lower level of BNP and a significantly higher level of LVEF were seen in the study group than in controls (p < 0.05). After the operation, the study group had significantly lower levels of CK, CK-MB and cTnI than the control group (p < 0.01). Pre-operative IL-6, TNF-α and hs-CRP levels were comparable between both groups (p > 0.05), but their post-operative values were significantly lower in the study group than in the control group (p < 0.01).Conclusion: The use of tirofiban for AMI patients undergoing PCI significantly reduces BNP, increases LVEF, improves cardiac function, protects myocardial cells, reduces the level of inflammatory cytokines, and inhibits inflammatory reactions.Keywords: Percutaneous coronary intervention, Acute myocardial infarction, Tirofiban, Cardiac functio

The Photometric Investigation of V921 Her using the Lunar-based Ultraviolet Telescope of Chang'e-3 mission

The light curve of V921 Her in ultraviolet band observed by the Lunar-based Ultraviolet Telescope (LUT) is analyzed by the Wilson-Devinney code. Our solutions conclude that V921 Her is an early type marginal contact binary system with an additional close-in component. The binary system is under poor thermal contact with a temperature difference of nearly $700K$ between the two components. The close-in component contributes about $19\,\%$ of the total luminosity in the triple system. Combining the radial velocity study together with our photometric solutions, the mass of the primary star and secondary one are calculated to be $M_1 = 1.784(\pm0.055)M_\odot$, $M_2 = 0.403(\pm0.012)M_\odot$. The evolutionary scenario of V921 Her is discussed. All times of light minimum of V921 Her available in the bibliography are taken into account and the $O - C$ curve is analyzed for the first time. The most probable fitting results are discussed in the paper, which also confirm the existence of a third component ($P_3=10.2$ year) around the binary system. The period of V921 Her is also undergoing a continuously rapid increase at a rate of $dP/dt=+2.79\times{10^{-7}}day\cdot year^{-1}$, which may due to mass transfer from the less massive component to the more massive one