Application the Cyclodextrin in Environmental Management

介绍了环糊精在富集和治理环境有机污染物方面的应用成果,以及环糊精对有机污染物生物降解过程影响方面的研究结果,提出环糊精在污染治理方面实际应用的可能性。The utilization of cyclodextrins(CDs)in enrichment and removal of environmental organic pollutants and their effects on biodegradation of environmental organic pollutants have been introduced in this paper. It claims that CDs can play a very important role in managing environmental organic pollutants

Study on environmental fates of polynuclear aromatic hydrocarbons in contaminated coastal sediment

本文在现场情况下 ,研究了自然条件下受污染海岸带沉积物中的 7种多环芳烃(PolynuclearAromaticHydrocarbons ,简称PAHs)的解吸动力学行为 .结果表明 ,7种PAHs的解吸动力学行为可以用二元模型描述 .文中并将所得数据与文献报道的数据进行了比较 .The desorption behaviours of seven polynuclear aromatic hydrocarbons (PAHs) in contaminated coastal sediment have been studied under field. Total sedimentary concentrations of acenaphthene, benzo(a)anthracene, benzo(k)fluoranthene, benzo(a)pyrene, chrysene, fluoranthene and naphthalene were followed after the contaminated sediment samples had been translocated to a pristine coastal environment. The desorption kinetics of these PAHs were found to be describable by a two compartment model. The field desorption data were compared to other laboratory based sorption desorption kinetic data in the literature and were found to be in accordance with results obtained via mesocosm approach involving direct extraction of desorbed PAHs from the aqueous phase. However, when compared to results generated by conventional gas stripping desorption technique, the field desorption rates were at least an order of magnitude smaller.国家自然科学基金!资助项目 (2 99770 16 ) ;; 福建省自然科学基金!资助项目 (D9910 0 0 8) ;; 教育部重点项目!(99180 ) ;; 香港城市

Study on thermal characteristics for power LED arc-array system

为准确计算lEd光场以及内部温度场的分布,结合有限体积数值模拟、非成像光学方法建立了单个lEd光学以及热学模型,并通过实验测试证实模型的有效性。在此基础上,采用能量叠加原理讨论了lEd弧面阵列系统目标平面区域的照度分布,得到了在特定距离的目标平面上均匀的照度分布。通过对复合型散热器系统结构中散热通道内钉柱与翅片的位置尺寸、基板厚度和器件间距的优化设计,增强了热交换效果。In this paper,the optical and thermal model of a single LED is established with finite volume thermal simulation method and non-imaging optics to accurately calculate the optical field and temperature field distributions.Experiments are conducted to confirm the validity of the model.Then the luminous intensity distribution on the target plane of the LED arc-array system is discussed by energy superposition theory,and the uniform illumination can be obtained on the target plane at a certain distance.Furthermore,the sices of fins and pins of the composite heatsink,the base thickness and component spacing are optimized for heat convection enhancement.福建省科技计划重点项目(2011H0021;2011H6025;2012H0039);福建省自然科学基金(2011J05162);福建省教育厅A类科技项目(JA11175);漳州师范学院科学研究(SJ1017)资助项

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