CdSe纳米团簇的透射电镜研究

在沸石分子筛中组装CdSe而形成半导体纳米团簇材料，并将组装CdSe后的沸石微粉制成完整的透射电镜薄膜，结合能谱测试，在透射电镜下观察所制得的材料的微观结构和形貌。结果表明在沸石中形成了尺寸单一、分布均匀的团簇材料

DETERMINATION OF TERBUFOS RESIDUES IN FOOD AND ENVIREMENT SAMPLES BY GC/GC-MS

建立在食品及环境样品中特丁硫磷残留量的气相色谱检测及气质联用确证法。样品采用乙酸乙酯提取、活性炭-酸性氧化铝复合小柱净化,丙酮-正己烷混合溶液(体积比为1∶9)洗脱,样液浓缩后经GC-FPD检测,外标法定量,GC-MS定性。GC-FPD法分析时,特丁硫磷在不同样品、不同水平的加标回收率为74.5%~103.3%,RSD为2.1%~11.7%(n=5),方法的检出限为0.001 mg/kg。气质联用法确证时,特丁硫磷的SIM离子为186、231(Q,100)、288。A method for the determination of terbufos residue in food and environment samples was developed.The GC-FPD was used as quantitative detection system,and positive sample was confirmed by GC-MS with SIM mode.Terbufos was extracted with ethyl acetate and eluted with acetone/n-hexane(volume ratio was 1∶9).A SPE column(ENVI-Carb 0.25 g,3 mL) with 0.5 g acid aluminum oxide on the top of the cartridge was used for purification.The recoveries of terbufos in different samples ranged from 74.5% to 103.3% with relative standard deviations ranging from 2.1% to 11.7%(n=5).Under the proposed conditions,the detection limit was 0.001 mg/kg for FPD.When terbufos was confirmed by GC-MS,186,231(Q) and 288 were selected as the SIM ions.厦门市科技计划项目(3502Z20072003);; 厦门出入境检验检疫局科技计划项目(2006XK03

塔里木河中下游荒漠化防治与生态系统管理研究与示范

该项目成果建立了荒漠区生态环境与经济和谐发展的模式，为正确处理生态环境建设与经济发展的关系提供了理论依据；建立了塔里木河中下游土地利用的5种模式和适宜性评价体系；创立了塔里木河中下游生态经济型植被的模式和结构优化配置方案；提出了6项绿洲灌溉农业节水节肥和棉花高产技术；确定了维护塔里木河中下游至大西海子和台特马湖生态安全的最低年需水量、最佳输水期，提出了塔里木河中下游天然植被合理地下水位的科学依据；揭示了塔里木河中下游30年断流输水后地表生态的响应规律；构建了数字塔河的框架，完成了水、土、植被等23个因子的图层

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