Study on the Property Insurable Interest

土地向来是农民赖以生存和发展的重要生产资料，随着我国城市化进程的加快，大量土地被征收，农民的生存权和发展权受到威胁，相应的社会矛盾也在加剧。土地征收作为唯一能够改变集体土地所有权的方式，故如果土地征收制度运行不好，将严重危害社会稳定及社会经济的持续健康发展，从而不利于和谐社会的建立。 本文除了引言和结语外，共分为四章： 第一章主要介绍土地征收制度的基本理论，包括土地征收的的概念，土地征收的内涵。第一节首先通过关于土地征收现状的分析，以及我国以前和现在对土地征收的规定，引出土地征收的概念和内涵。它是指国家为了公共利益的需要，严格依据法律规定和程序征收农村集体所有的土地，如何给予合理补偿的一系...Land has always been an important production for a farmer to survive and develop. With the accelerated process of urbanization in China, a lot of land was expropriated, the right to survival and development of farmers is under threat, social conflict has intensified accordingly. Land acquisition is the only way to change the collective ownership of land, so if the land expropriation system did not...学位：法律硕士院系专业：法学院法律系_法律硕士(JM)学号：X200612005

带非吸收窗口的大功率657 nm半导体激光器

在激光器腔面处制作非吸收窗口(NAW)可以有效地减少光吸收,防止激光器过早出现光学灾变损伤(COD),是提高大功率半导体激光器的功率特性的重要手段之一.采用金属有机化学气相沉积(MOCVD)技术二次外延生长了大功率657 nm红光半导体激光器结构,通过闭管扩散Zn的方法在腔面附近制作了非吸收窗口.实验发现扩散温度550 ℃,扩散时间20 min时,得到的非吸收窗口最为有效,激光器连续工作的无扭折输出功率大于100 mW,超过常规的无窗口结构激光器的最大输出功率的两倍,激光器的斜率效率提高了23%.测量该类器件的温度特性发现,环境温度为20～70 ℃时,其输出功率均可大于50 mW,计算得到激光器的特征温度约为89 K,波长增加率约为0.24 nm/℃

Three kinds of digestion methods applied to determination of Pb,Cu,Cd,Hg and As in marine sediment

常压湿式消解、高压微波消解、常压微波消解3种方法被应用于近海沉积物中Pb、Cu、Cd、Hg、As 5种重金属元素的分析。以近海海洋沉积物标准物质为样品经3种方法消解后,通过石墨炉原子吸收法测定Pb、Cu、Cd和氢化物发生原子荧光法同时测定Hg、As。结果表明,样品经常压湿式消解,其Pb、Cu、Cd回收率在80%~123%内而Hg、As回收率低;经高压微波消解,标样中Pb、Cu、Cd、As回收率在84%~117%内,对Hg测定回收率偏低;常压微波消解更适合于Cu、Cd、Hg、As的消解,其回收率在95%~121%之间而Pb回收率低于42.4%。常压湿式消解与常压微波消解被用于大亚湾人工渔礁区沉积物样品的处理,有较好的测定结果。Three kinds of methods of waterish digestion in common pressure(WDCP),microwave digestion in high pressure(MDHP) and microwave digestion in common pressure(MDCP) were applied to digest marine sediment in analyzing Pb,Cu,Cd,Hg and As. Marine sediment Standard material was used as sample to determine Pb,Cu and Cd with GF-AAS and Hg,As with HF-AFS.The results showed that the recoveries of Pb,Cu and Cd were in the range from 80% to 123% after digested with WDCP,while the recoveries of Hg and As being lower;the recoveries of Pb,Cu,Cd and As in the standard material were in the range of 84%～117% after digested with MDHP,the recovery of Hg was lower,however.MDCP was more conformable for digestion of Cu,Cd,Hg and As in marine sediment,the recoveries of that in the range of 95%～121%.The recovery of Pb in sediment was lower than 42.4% after digested with MDCP.The samples from man-made Fish-reef in Daiya Bay were digested with methods of WDCP and MDCP,which showed a satisfactory result.863海洋监测技术成果标准化工程(200402);; 深圳市科技计划(2004B121)项目资

Determination of the number of ψ(3686) events taken at BESIII

The number of ψ(3686) events collected by the BESIII detector during the 2021 run period is determined to be (2259.3±11.1)×106 by counting inclusive ψ(3686) hadronic events. The uncertainty is systematic and the statistical uncertainty is negligible. Meanwhile, the numbers of ψ(3686) events collected during the 2009 and 2012 run periods are updated to be (107.7±0.6)×106 and (345.4±2.6)×106, respectively. Both numbers are consistent with the previous measurements within one standard deviation. The total number of ψ(3686) events in the three data samples is (2712.4±14.3)×10^