新型电机驱动轮式牵引装置的设计与参数分析

提出一种新型的电机驱动轮式牵引装置,对牵引装置的结构及原理进行了阐述;建立了牵引装置的驱动机构结构受力及参数计算模型,求解目标参数接触力系数的解析函数。通过对参数及越障的分析得出牵引装置各参数之间的变化关系,并结合计算实例验证驱动机构结构设计及参数分析的合理性,能满足牵引装置结构特性的前提下,提高牵引装置的牵引能力和井下越障适应性。牵引装置的齿轮传动机构啮合性好,传动稳定,能实现自扶正双向驱动,以提高牵引装置在井下爬行的稳定性、承载能力,增强牵引装置在井下作业的柔性弯曲适应能力。为油气井井下牵引装置的设计和发展提供新的思路

准双曲面齿轮热后接触区质量控制研究

针对准双曲面齿轮在热处理过程中存在畸变，热处理后接触区质量较差的现状，提出了一种利用主、被动齿1阶相对齿面误差分析接触区偏移的方法。通过试验研究得到主、被动齿相对螺旋角误差对接触区偏移的影响规律，并验证了接触区偏移原理的正确性。同时，利用接触区偏移原理和热处理畸变规律，在切齿阶段进行补偿热处理畸变量，得到新的切齿模型进行生产。结果表明，通过该方法能使热处理后齿面误差在标准范围内，热处理后接触区的质量也得到控制

茶质滤嘴的祛烟瘾减害作用研究

吸烟可以引起一系列严重疾病,吸烟对健康的危害已成为人类面临的重大公共卫生问题.尽管科学研究和医疗工作者实验了各种方法,但是效果仍不理想,控烟已成为一个世界性难题.为了寻找破解这一难题的新对策,研制了一种茶质滤嘴(国际发明专利号:PCT/CN2009/000763)可以对吸烟依赖有明显的祛致瘾作用,并初步探明了其作用机理.第一批临床实验发现,吸烟志愿者使用茶质滤嘴2个月,吸烟量减少52%左右,其中31%减少到0.另一批临床实验发现,吸烟志愿者使用茶质滤嘴3个月,吸烟量在第1,2和3个月分别减少约48%,83%和91%,在最后一个月每天吸烟量由原来平均每天24.5支减少到每天3支左右.动物实验发现,茶质滤嘴中的茶氨酸可以明显抑制尼古丁在小鼠中引起的条件性位置偏爱,与尼古丁乙酰胆碱受体(nAChRs)抑制剂有类似的效果.测定小鼠脑nAChRs发现,茶氨酸处理动物可以抑制尼古丁引起的3种尼古丁乙酰胆碱受体亚基的表达上调,而且多巴胺释放增加受到明显抑制.茶质滤嘴还可以明显降低吸烟产生的有害物质,降低吸烟引起动物的急性毒性和慢性致癌性.本工作发现了抑制烟草和尼古丁成瘾的新物质&mdash;&mdash;茶质滤嘴和茶氨酸,提供了一种可以战胜吸烟危害的新策略.该工作的实施和推广将可以保护当代和后代免受吸烟对健康、社会、环境和经济造成的破坏性影响,对建设和谐的人类文明社会和国民经济的持续发展具有重要意义.</p

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