半蹼鹬的繁殖习性

1985年6月～2004年6月在向海保护区对半蹼鹬繁殖习性进行了观察。研究结果表明,半蹼鹬每年迁至向海时间集中在5月中下旬,并主要分布在粮库泡、白山泡、付老文泡、大肚泡、小塔甸子、二百方等地。巢址包括密集的苇丛、稀疏芦苇中突出的泥沼和植物簇生的岛状沼泽地带3种类型。雌雄共同营巢,巢由陈旧苇茎、叶、根、三棱草、蒿、碱蓬杆等交织而成,筑巢过程需5～7 d。筑巢期间即开始交尾,每次约持续10～15 s;窝卵数为1.95 （1～3）枚,日产1卵。孵化任务由雌雄共同承担,孵化期平均为23.8（20～25）d;雌雄参与孵化时间在不同阶段有所差异;孵化率100%,但离巢成活率仅38.46%

大鸨越冬栖息地选择

2003～2006年的1～2月在吉林省镇赉县和内蒙古兴安盟科尔沁右翼前旗接合部的草原地带,对大鸨越冬栖息地的选择进行了考察研究,并将栖息区域人为地划分为3种类型。一是农田荒地和周边草甸,二是平均低于40cm的矮针茅草原,三是平均高于40cm的高针茅草原。结果表明,大鸨对这3种栖息地类型选择明显。农田生境植物性食物丰富,草原生境动物性食物较多

JUNO Sensitivity on Proton Decay p→νˉK+p\to \bar\nu K^+ Searches

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this paper, the potential on searching for proton decay in $p\to \bar\nu K^+$ 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 to suppress 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% with a background level of 0.2 events after 10 years of data taking. The estimated sensitivity based on 200 kton-years exposure is $9.6 \times 10^{33}$ years, competitive with the current best limits on the proton lifetime in this channel

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