80W-140型无人直升机主减速箱齿轮油台架性能试验研究

为了实现无人直升机齿轮油国产化，明确不同性能的齿轮油对齿轮箱性能的影响，从而科学地提高齿轮箱的可靠性和寿命，郑州机械研究所有限公司联合多家单位自主开发了80W-140型无人直升机齿轮油。在实验室对油品性能测试的基础上，通过齿轮箱综合性能试验台对80W-140型油品和进口油的性能表现进行了对比测试，并对台架试验测试得到的振动、噪声、温度、效率和胶合转矩等指标进行了分析。结果表明，不同性能油品对齿轮箱的效率和承载能力的影响明显不同，所研制的80W-140型油品具有较好的抗磨减摩和抗胶合性能，可有效提高齿轮箱的可靠性

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