Analysis on Labor Transfer Mode in China's Urbanization Process

失地农民安置是关系到构建社会主义和谐社会，实现全面建设小康社会目标的大问题。 失地农民如何转换成产业工人和市民，如何解决他们的生活来源和工作出路，是我国今后相当长的时期内需要解决的问题。 本论文试图运用经济学的手段，从分析城市化进程中农村劳动力的转移安置模式出发，紧扣失地农民安置这个主线，通过借鉴国外的经典理论和经验模式，结合国内专家学者的研究成果，进行理论总结提炼。 从现有的农村劳动力转移安置模式角度，进行案例分析，对我国现存的转移安置模式剖析，寻找依据，对比利弊。 最后，以理论为依据，以研究成果为指导，针对我国城市化劳动力转移过程中失地农民问题提出政策建议。 在有关城市化引起失地...The resettlement of landless peasants is a great problem which related to the construction of a socialist harmonious society and realizes the across-the-board construction of XiaoKang society. How can landless peasants be transformed into industry worker and city resident, How to provide them with adequate food and clothing, is the question that our country need to settle in a long period of time...学位：经济学硕士院系专业：经济学院经济系_政治经济学学号：1532006115077

Development of solid phase micro-extraction for the environment monitoring

为了促使我国环境监测工作更加深入和细致,得到更准确可靠的监测结果,对固相微萃取(SPME)技术在大气监测、水体监测、土壤及沉积物监测和生物监测中的应用进行了综述。根据SPME在测定污染物的浓度和存在形式,来源、分布和运移规律,以及降解、转化过程等方面的特点,提出进一步开发SPME原位测定技术和与大型仪器联用技术,将有利于其测定范围和种类的增加。同时由于SPME技术的特点适合海洋环境介质的测定,建议在海洋监测领域推广使用,使我国的海洋环境监测工作更加深入和广泛。The present paper describes a method known as the solid phase micro-extraction(SPME)to determine the organic compounds in monitoring the environment.In comparison with the existing technologies,SPME offers more advantages,such as simplicity,speed and greater sensitivity.It has been widely used for monitoring different phases,e.g.air,water,soil and sediment,as well as biological purposes.In air monitoring,the combination of SPME with GC/MS can be used to identify 75 contaminants,including 40 alkanes,1 alkene,15 alcohols,8 aldehydes,3 ketones,5 aromatics,and 3 miscellaneous ones.In quantifying determininants,SPME's sensitivity can be made far greater than that made by using traditional methods.In water monitoring,SPME could be combined with GC/MS,GC/FID,or HPLC to determine many kinds of contaminants,such as volatile phenols,halogenated hydrocarbons,etc.In some trials,SPME can be used to determine concentrations of methyl mercury,inorganic mercury,methyl tert-butyl ether(MTBE),tributyltin(TBT),and benzo[a] pyrene in aquatic environment,in which the biggest value is 77.0 ng/L,129 ng/L,194 ng/L,976.9 ng/L and 5495 ng/L,respectively.In soil and sediment trials,it is used to monitor changes of metabolite concentrations throughout the degradation processes,to monitor transition rules of organic compound,and HOCs in milliliter sediment pore water.So far,researchers have worked out the measured contaminants by using 95 % of concentration data,of which the hazard index is 0.07 for fish within the safe limits.Therefore,on the basis of obtaining concentrations of different specifications by SPME,the research groups could analyze the contaminants as to their origins,their surface appearance,and the ways of their distribution.Furthermore,they are also trying to find the changing tendency of the whole biota environment and assess the hazard to human beings.Needless to say,further applications and new improvements of SPME remain to be discussed in detail.国家自然科学面上基金项目(20677063);; 国家自然科学基金重大项目(40490264);; 广东省自然科学基金项目(5003680);; 广州市科技计划项目(2007J1-C0241);; 厦门大学近海海洋环境科学国家重点实验室开放基金项目(MEL0504);; 同济大学长江水环境教育部重点实验室开放基金项目(YRWEF07004

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