Studies on Photodegradation Process and Mechanism of Typical Pyrethroid Pesticides in Water Phase

本文利用联苯菊酯、氰戊菊酯及氯氰菊酯的吸收光谱特性及其主要光降解产物的荧光光谱特性、质谱特性，较为系统、全面研究了几种典型拟除虫菊酯农药的光降解反应动力学特性及光降解反应机理，取得了一些研究成果，为今后进行拟除虫菊酯农药的环境化学、地球化学研究提供了许多有价值的结论： ⑴论文系统地建立了离线光降解装置-紫外可见-荧光-质谱检测体系，并对水体中联苯菊酯、氰戊菊酯及氯氰菊酯农药母体光降解反应动力学、反应产物鉴定、反应机理推测进行研究，研究方法的建立为进一步研究拟除虫菊酯农药、氨基甲酸酯类农药、抗生素药物等化学品在水环境中的光降解反应产物、反应机理提供了参考，为农药、药物等的光降解中间产物的环...Using the absorption spectra, fluorescence spectra and mass spectrum characteristics of bifentrhrin、fenvalerate、cypermethrin and their photodegradation products, systematically and comprehensively studied several typical pyrethroids pesticide photodegradation reaction kinetics characteristics and photodegradation reaction mechanism, some research in the future to pyrethroids pesticide environmenta...学位：理学博士院系专业：海洋与环境学院海洋学系_海洋化学学号：2005140316

The progress of studies on Chlorella sp. as feed

小球藻是一种营养丰富的单胞藻,前人在轮虫和贝类饵料方面有较为系统的研究．该文从小球藻大规模培养方式,浓缩小球藻的保存效果,作为轮虫、贝类饵料的饲喂效果,以及小球藻的环境效应等方面进行综述．Chlorella sp. is a nutritive unicellular alga, which as the feed of rotifer and mollusc has been studied systematically. In the paper, large-scale cultivating-modes for Chlorella sp., preserving efficiency of concentrated Chlorella sp., effect of feeding rotifer and mollusc with Chlorella sp., and its environmental effect were reviewed.国家自然科学基金(39870565

Reduced-order H_∞ Filtering Design for Singular Systems Based on Stable Invariant Zeros

研究了连续奇异系统的降阶H∞滤波器的设计问题.通过将原系统转化为一个标称系统和一个不确定部分,同时增加补充的约束条件,使原系统的稳定不变零点转化为标称系统的不稳定不变零点,从而可以基于标称系统,利用已有的降阶算法设计得到原系统的降阶H∞滤波器.文中给出了降阶H∞滤波器的设计算法,并进一步研究了可用于构造降阶滤波器的不变零点的范围.最后给出一个算例,说明该设计方法的有效性和可行性.This paper considers reduced-order H∞ filtering design for continuous singular systems.By adding a complementary constraint,the original system is divided into a nominal system and an uncertain part,then the stable invariant zeros of the original system become unstable in the nominal system.Based on the nominal system,a reduced-order H∞ filter for the original system can be designed by using the existing method.An algorithm to solve the problem of reduced-order H∞ filtering is proposed,and the range of invariant zeros which can be used to construct a reduced-order filter is discussed.An illustrative example is given to demonstrate the effectiveness of the proposed approach.福建省新世纪优秀人才支持计划资

Infrared spectrometry of sulfate polysaccharides of Chlorella autotropica

利用二乙胺基乙基琼脂糖凝胶柱层析纯化自养小球藻(Chlorella autotropica)粗多糖,得到3个硫酸多糖组分(A,B,C);利用高效液相色谱仪和熔点仪测定了3个多糖的分子质量和熔点;利用BaCl2浊度法测定了硫酸多糖中硫酸根的质量分数;利用傅立叶变换红外光谱分析了海水自养小球藻3个硫酸多糖组分的环状结构、半缩醛羟基构型及取代基类型。结果显示,3个硫酸多糖组分的硫酸根的质量分数分别为0.77%,8.46%,2.69%,3个组分均含有硫酸基、酰氨基,葡萄糖是3个硫酸多糖组分的主要组成单糖;3个硫酸多糖组分组成单糖的环构型均是吡喃环,成苷的半缩醛羟基构型有一定差异,A是α构型,B、C是α、β两种半缩醛羟基构型并存。为深入研究自养小球藻硫酸多糖的结构及抗癌活性提供基础。In order to research the structure and anti-HIV activity of sulfate polysaccharides, three white refined sulfate polysaccharides (A, B, C) were gained with the DEAE sepharose column chromatographic analysis; molecular weights and melting points of three sulfate polysaccharides were got with the HPLC technology and melting point apparatus; determination of sulphate content was made by barium chloride gravimetric method; the chemical compositions and configuration of marine Chlorella autotropica polysaccharides basicly extracted from marine Chlorella autotropica were studied by FT-IR spectroscopy. The results show that sulphate contents of three sulfate polysaccharides were 0.77%, 8.46%, 2.69% respectively, all the three marine Chlorella autotropica polysaccharides have acylamino radical and sulfate radical. Glucose is always a dominant monosaccharide in the three sulfate polysaccharides. Pyranose is the major component of the sulfate polysaccharide in the A, with one glycoside configuration, α-hemiacetal hydroxyl. Pyranose is also the major component of the sulfate polysaccharide in the B and C, with two glycoside configurations, α-hemiacetal hydroxyl and β-hemiacetal hydroxyl coexisted.国家自然科学基金资助项目(39870565

Chemical Structure Study of Polysaccharide PCA1 Derived from Chlorella autotrophica

选取自养小球藻(Chlorella autotrophica)为研究对象,从中分离纯化得到3个组分,对其中的组分PCA1进行研究.电泳及高效凝胶过滤色谱法(HPGFC)鉴定其为均一多糖组分,熔点为226.9℃.相对分子量为1.3×105,气相色谱法及红外光谱显示其主要由α-D-吡喃葡萄糖组成,并含有一定量硫酸基.甲基化及13C-NMR结果表明PCA1是一种以1,4-的α-D-吡喃葡萄糖构成的均一多糖.Studies on algae have attracted more attention in these years due to the potential biological active materials.Recently,purified seaweed polysaccharides were found to have biological activities,such as antitumor,antivirus,antihyperlipidemia and anticoagulant.Chlorella autotrophica is a widely distributing alga that contains different polysaccharides in cell.Previous study on extract of chlorella autotrophica shows that it has antivirus ability to VHSV and ASFV.In order to test their bioactivities,three fractions of polysaccharide were isolated from Chlorella autotrophica and one of them,PCA1,was studied in this paper.Purity of PCA1 was determined with methods of electrophoresis and HPGFC,and the melting point is 226.9℃.The molecule weight of PCA1 is 134690,GC and FT-IR results show that it is mainly made of α-D-glucopyranoside and also functional group of sulfate radical.Both results of methylation and 13C-NMR suggest that PCA1 is most likely a α-(1→4) bonded glucopyranoside.国家自然科学基金(39870565);; 厦门大学科研基金(20005003)资

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

Prediction of Energy Resolution in the JUNO Experiment

International audienceThis paper presents the energy resolution study in the JUNO experiment, incorporating the latest knowledge acquired during the detector construction phase. The determination of neutrino mass ordering in JUNO requires an exceptional energy resolution better than 3% at 1 MeV. To achieve this ambitious goal, significant efforts have been undertaken in the design and production of the key components of the JUNO detector. Various factors affecting the detection of inverse beta decay signals have an impact on the energy resolution, extending beyond the statistical fluctuations of the detected number of photons, such as the properties of liquid scintillator, performance of photomultiplier tubes, and the energy reconstruction algorithm. To account for these effects, a full JUNO simulation and reconstruction approach is employed. This enables the modeling of all relevant effects and the evaluation of associated inputs to accurately estimate the energy resolution. The study reveals an energy resolution of 2.95% at 1 MeV. Furthermore, the study assesses the contribution of major effects to the overall energy resolution budget. This analysis serves as a reference for interpreting future measurements of energy resolution during JUNO data taking. Moreover, it provides a guideline in comprehending the energy resolution characteristics of liquid scintillator-based detectors