清代勘分中俄边界大臣的一件哈萨克察哈台文文书研究

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青海湖区大型底栖动物群落结构与空间分布格局

为了解青海湖大型底栖动物的群落结构特征、空间分布格局及关键驱动力,于2011—2012年分4次对青海湖区主体湖、3个子湖和5条入湖河流进行了系统调查。共采集到底栖动物28个分类单元,隶属于3门5纲15科,主体湖区、咸水和淡水子湖及入湖河流分布有9、5、9和15种;它们的密度分别为455.8、1562.7、741.3和331.2 ind./m2;生物量为1.18、3.70、2.75和4.53 g/m2。优势度分析显示,喜盐摇蚊为主体湖区绝对优势种(占总密度的83.32%)。Surfer模拟显示,主体湖区东南部沿岸带的密度和生物量最高,湖心区最低;高峰值主要出现在布哈河、菜挤河等大型河流入湖的河口附近。CCA分析表明:青海湖区大型底栖动物的分布主要受水体pH、水深、总氮和盐度等环境因子的驱动

Numerical simulation of drop oscillation in AC electrowetting

microscopic model" for the moving contact line. The contact line model developed by Ren et al. [Phys Fluids, 2010, 22: 102103] is used in the simulation. To determine the slip length in this model, we propose a calibration procedure using the experimental data of drop spreading in DC electrowetting. In the simulation, the frequency of input AC voltage varies in a certain range while the root-mean-square value remains fixed. The numerical simulation is validated against the experiment and it shows that the predicted resonance frequencies for different oscillation modes agree reasonably well with the experiment. The origins of discrepancy between simulation and experiment are analyzed in the paper. Further investigation is also conducted by including the contact angle hysteresis into the contact line model to account for the "stick-slip" behavior. A noticeable improvement on the prediction of resonance frequencies is achieved by using the hysteresis model

Determination of the number of ψ(3686) events taken at BESIII

The number of ψ(3686) events collected by the BESIII detector during the 2021 run period is determined to be (2259.3±11.1)×106 by counting inclusive ψ(3686) hadronic events. The uncertainty is systematic and the statistical uncertainty is negligible. Meanwhile, the numbers of ψ(3686) events collected during the 2009 and 2012 run periods are updated to be (107.7±0.6)×106 and (345.4±2.6)×106, respectively. Both numbers are consistent with the previous measurements within one standard deviation. The total number of ψ(3686) events in the three data samples is (2712.4±14.3)×10^

JUNO sensitivity on proton decay p → ν K + searches*

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this study, the potential of searching for proton decay in the $p\to \bar{\nu} K^+$ mode with JUNO is investigated. The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits suppression of the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar{\nu} K^+$ is 36.9% ± 4.9% with a background level of $0.2\pm 0.05({\rm syst})\pm$$0.2({\rm stat})$ events after 10 years of data collection. The estimated sensitivity based on 200 kton-years of exposure is $9.6 \times 10^{33}$ years, which is competitive with the current best limits on the proton lifetime in this channel and complements the use of different detection technologies