原子转移自由基聚合法制备超大孔聚合物微球

以甲基丙烯酸缩水甘油酯为单体(GMA)、乙二醇二甲基丙烯酸酯(EDMA)为交联剂,采用原子转移自由基聚合法(ATRP)制备了PGMA-EDMA大孔聚合物微球,采用傅里叶变换红外光谱、扫描电子显微镜及压汞法对PGMA-EDMA微球进行了表征.研究结果表明,原子转移自由基聚合法制备的PGMA-EDMA微球的孔径尺寸及比表面积均大于普通自由基聚合法(CFRP)制备的PGMA-EDMA;ATRP法制备的PGMAEDMA微球的颗粒尺寸(100~400 nm)明显小于CFRP法制备的PGMA-EDMA微球的颗粒尺寸(1000 nm).PGMA-EDMA(ATRP)的微球粒径尺寸分布优于PGMA-EDMA(...</p

原子转移自由基聚合法制备超大孔聚合物微球

以甲基丙烯酸缩水甘油酯为单体（GMA）、乙二醇二甲基丙烯酸酯（EDMA）为交联剂,采用原子转移自由基聚合法（ATRP）制备了PGMA-EDMA大孔聚合物微球,采用傅里叶变换红外光谱、扫描电子显微镜及压汞法对PGMA-EDMA微球进行了表征.研究结果表明,原子转移自由基聚合法制备的PGMA-EDMA微球的孔径尺寸及比表面积均大于普通自由基聚合法（CFRP）制备的PGMA-EDMA;ATRP法制备的PGMAEDMA微球的颗粒尺寸（100-400 nm）明显小于CFRP法制备的PGMA-EDMA微球的颗粒尺寸（1000 nm）.PGMA-EDMA（ATRP）的微球粒径尺寸分布优于PGMA-EDMA（CFRP）.因此PGMA-EDMA（APRP）微球在快速蛋白分离纯化方面有潜在的应用前景

典型温带荒漠区原生植被对环境变化的响应与适应研究

典型温带荒漠区－准噶尔盆地的原生植被具有类型、结构、功能上的独特性。是干旱区物种最丰富的地区之一,具有从小乔木、短命、类短命植物和一年生植物到生物结皮的多层片结构,起着保护天山北坡经济带的重要生态功能。过去几十年来,剧烈的人类活动和全球气候变化已经使该地区的自然环境发生了重大变化,并且这种变化还在继续。从本质上认识该区原生荒漠植被如何应对这种自然环境改变,对预测该区荒漠植被的未来至关重要,对人类如何保护和修复受损荒漠植被、维护绿洲生态系统的功能具有重要的理论与实践意义。 2002年～2007年,本项研究在中国科学院“百人计划”项目“干旱区植物对水、盐胁迫的响应：从叶片到生态系统(20..

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