~(60)Co-γ射线辐照种子对牛至形态与挥发性成分的影响

牛至精油中的主要成分香芹酚和百里香酚具有较强的抑菌活性和替代抗生素的良好潜力。为了筛选有价值的遗传变异,构建了牛至(Origanumvulgare)的60Co-γ射线育种体系,利用固相微萃取联合气相色谱-质谱方法进行挥发性成分测定,并通过主成分分析和层次聚类等多元分析法,深入探讨60Co-γ射线对牛至M1代形态特征、腺毛密度和腺毛大小以及挥发性成分的影响。结果表明,牛至种子的半致死剂量为16.39 Gy;辐照M1代植株的株高、茎粗、分枝数、叶长和叶宽均发生变化,筛选到多株形态突变体;同时,腺毛密度和腺毛大小发生多种变化,从163株存活株中筛选出25株腺毛密度与大小均显著增大的单株; 60Co-γ射线处理对牛至挥发性成分的种类影响相对较小,主要影响挥发性成分的含量,并可诱导5种化学型,即香芹酚型、百里香酚型、γ-萜品烯型、β-石竹烯型和大根香叶烯型;最终筛选获得6株香芹酚和百里香酚含量升高的突变单株。研究证实了~(60)Co-γ射线辐照可作为牛至育种的一种有效诱变手段,适宜辐照剂量为20 Gy。研究为牛至优良种质资源的选育提供了基础数据和新途径

Walking clamping combined structure for inspection robot

本发明涉及巡检机器人机构，具体地说是一种巡检机器人的行走夹持复合机构，包括行走轮驱动电机、支架、行走轮、升降机构、夹紧驱动电机、连杆机构及夹紧轮，支架安装在巡检机器人的手臂上，行走轮驱动电机设置在支架上，行走轮位于架空地线的上方，与行走轮驱动电机的输出轴相连，由行走轮驱动电机驱动在架空地线上行走；升降机构安装在支架上，并与夹紧驱动电机相连，由该夹紧驱动电机驱动升降；夹紧轮位于架空地线的下方，通过连杆机构与升降机构连接，由升降机构带动夹紧或松开架空地线。本发明的夹紧轮通过连杆机构夹紧或松开，所需的运动空间变小，可以减小巡检机器人的手臂长度，有利于减小巡检机器人的尺寸和重量

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