A Study of New Mode of Two-Phase Culture of Dunaliella Salina for Producing β-carotene

通过模拟现场条件的正交设计实验l_(27)(3--(13)),研究了盐藻两阶段养殖生产β-胡萝卜素的最佳环境因素。结果表明:在相同时间内(14d),两阶段养殖比一次性养殖生产β-胡萝卜素产量(Mg/l)提高1.19倍,其生长速率(d--(-1))提高1.09倍。The optimum environmental factors of producing β-carotene condition of two ?phase culture of Dunaliella Salina is studied by the experiment of the othogonal design [L27 (313)] for simulating the field condition.The results show that theβ-carotene production (mg/L) and the growth rate (d-1) for the new ?mode of two-hase culture have increased by 1.19 times and 1.09 times respectively as compared with the old mode of batch culture in the same period (14 days)

INSTRUMENT FOR DETECTING SENSITIVITY OF STRESS-CORROSION CRACKING DUE TO SULPHIDE INCLUSION IN PIPING STEEL

本装置为一种含硫油气集输系统的安全检测装置，其结构由信号检测部分和数据处理两部分组成。检测部分为带有前置NHA型传感器探头。有旁路联接式和直接插入式两种。将信号输入给带有电流信号放大的A/V转换器，再送给A/D转换，然后送给微机作数据处理，最后由打印机将数据

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