Effect of different irrigations on dynamic population and the correlation with yield of different genetic wheats

在灌水和非灌水条件下,研究了5个不同基因型小麦群体动态的变化及其与产量的相关性表现。 结果表明,不同基因型小麦在灌水小区的群体指标明显高于非灌水小区;叶面积指数(LAI)变化呈“S”形曲线,且与 产量有很大的相关关系;在干旱条件下全生育期的LAI变化幅度较灌水条件下小,且拔节以后的LAI对产量影响 较大;不同处理下各基因型小麦群体变化对产量的贡献不同。因此,在旱作农业生产中,小麦除了选用大穗型品种 外,还要力求保持小麦生育后期有较高的绿叶面积,并使各因素协调发展,以获得较高的经济产量

高电荷态ECR离子源——LECR3

研制成功了一台新的高电荷态ECR离子源,该离子源主要为原子物理实验提供各种高电荷态离子束流,是基于中国科学院近代物理研究所14.5GHz高电荷态ECR离子源设计建成的,同时在该离子源中应用多种有利于提高束流强度的技术,设计时考虑到采用双频加热,试图通过试验双频加热模式来提高高电荷态离子的产额,并设计建造了一套束流聚焦分析系统,以提高电荷态分辨率和束流传输效率

2.45GHz单电荷态电子回旋共振离子源

描述了一台 2 .4 5GHz单电荷态电子回旋共振 (ECR)离子源的原理、结构与应用。介绍了其微波系统与磁场结构。在微波输入功率约 6 0 0W ,引出高压 2 2kV ,引出孔径为6mm时 ,该离子源的总束流I(H1++H2 ++H3+)可达 90mA

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