国家微重力实验室百米落塔实验设施的几项关键技术

在国家863计划的支持和安排下于2003年建成的国家微重力实验室百米落塔是我国发展载人航天, 开发利用外层空间计划中进行微重力科学实验的重要地基设施. 与美、德、日等国的同类设施相比, 我国的这座落塔在技术性能上先进水平, 并具有我国自己的特色. 其主要组成部分: 实验舱组件、减速回收系统和释放系统都展现了其先进性和原始创新性, 显示了我国在这个领域内的实力

Determination of Trace Mercury in Samples of "Liu Wei Di Huang Wan" by Cold-Atom Generation Atomic Spectrometry

本文采用自制电热恒温石英管还原气化冷原子吸收光谱法，直接测定了六味地黄丸中的痕量汞。方法检出限为0·1PPb；回收率为90~98%；相对标准偏差为4.3%。该方法简便，重现性好，准确度高。可用于中成药中痕量汞的测定。Using a homemade device of the electric heated quartz-tube atomizer,including a con-trolling temperature unit and a continue hydride generator,trace mercury in samples of "liuWei Di Huang Wan"has been determined directly.The method is simple,convenient, and ofgood precision and high accuracy.It is a very practical method For the analysis of trace mer-cury- The determination limit is below O.1ppb,and the recovery is 90- 98%'国家教委重点实验室资

Some Key Technics of Drop Tower Experiment Device of National Microgravity Laboratory (China) (NMLC)

Drop tower is an important ground based facility for microgravity science experiment. The technical performances of the drop tower NMLC are advanced compared with similar facilities in the US, Germany and Japan. The main components such as drop capsule, deceleration devices, release mechanism present its advantages and creativities

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