Study for Natural Gas Hydrate Formation Influential Factors in Drilling Fluid

In deepwater drilling , the low temperature and high pressure favors hydrate formation in drilling fluid, which can bring great harm to deepwater drilling. A lot of work has been studied based on the developmet of gas hy- drate formation and inhibition t

Study for Natural Gas Hydrate Formation Influential Factors in Drilling Fluid

In deepwater drilling , the low temperature and high pressure favors hydrate formation in drilling fluid, which can bring great harm to deepwater drilling. A lot of work has been studied based on the developmet of gas hy- drate formation and inhibition t

Experimental Study of Natural Gas Hydrate Formation in Water Based Mud

In the drilling process,with the proper temperature and pressure conditions,the drilling fluid is easy to form gas hydrates,which can cause pipeline blockage and the fluid properties change. In this work influences of two water-based drilling fluids on t

入侵性杂草——裸冠菊在中国内陆四川省的首次发现

报道描述了首次入侵中国内陆四川省的菊科一种植物——裸冠菊(Gymnocoronis spilianthoides),该种的重要鉴定特征为水生,叶对生,舌状花白色或淡紫色。结合对四川口岸的植物调查,我们提出了以下防控建议:制定口岸中长期防治规划及构建监测预警平台;加强科研及业务资金的投入;加强机构建设与组织协调;立法促进检疫工作

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