美日国际资本流动的比较分析

当今世界经济全球化在不断加剧,其中一个主要特点就是资本在国际间流动,包括直接投资、间接投资、国际信贷、暂时性的股票和债券买卖等。自从工业革命以来,世界上发生了三次大规模的资本流动浪潮。第三次浪潮中(1990—2007),国际资本流动由两大潮流构成,一是中国和日本以及欧洲各国对美国债券投资资金,二是美国进行股票投资而提供给各国的资金

某工程桩基质量问题的一种处理方法

据统计,国内灌注桩施工中桩身出现质量缺陷的概率达20%。一旦发生桩基质量事故,应及时进行事故原因分析评判,对事故进行处理,以保证建筑物的正常使用,并尽量减少经济损失。通过对一起桩基事故的分析和处理,说明其处理的方法及其原理,为今后相关处理提供经验借鉴

Third-party audit and optimization design of high-rise structure beyond code-specification of one hotel tower

某酒店塔楼是一栋180m(含3层避难层)的超限高层建筑,采用框架-核心筒结构,在34层位置有结构转换。在对结构设计进行结构体系、结构布置、构件设计和施工图设计审核的基础上,从主体框架-核心筒结构体系的构件布置和构件设计、楼盖体系的布置和构件设计、荷载取值、计算配筋和施工图配筋等方面进行了结构设计优化。采用盈建科、SATWE、MIDAS Building等多种计算软件进行了小震下结构整体内力位移分析;采用EPDA&PUSH对结构在大震下的整体内力位移进行了分析计算。立足规范和结构性能要求,对结构设计提出了修改意见和建议。One hotel tower is a 180 meters high( including 3 refuge storey) high-rise building beyond code-specification,adopts the structure system of reinforced concrete frame-core wall and structure transformation at 34 th storey. Based on the structure system,structural layout,component design and construction design review of the structural design,the structural design optimization is applied to aspects on component layout and component design of the main frame-core wall structure system,floor system layout and component design,load value,reinforcing bars calculation and reinforcing bars of construction drawing. The internal forces and displacements on the structure under frequently occurred earthquake is analysed by structure software YJK,PKPM and MIDAS Building. EPDA&PUSH is adopted to analyse the internal forces and displacements on the structure under rarely occurred earthquake. In the case of meeting the requirements of codes and structure performance,amendments and recommendations are proposed to apply to structure design. Suggestions is proposed to solve the problems which is faced during the process of third-party audit and optimization

全参数全约束优化对钢筋混凝土框架结构设计的造价分析

目前的优化设计一般是将参数简化为一维问题或多维问题,或为全参数优化设计,但约束条件不够充分.针对这些不足,本文建立了更全面的符合工程设计的全参数全约束优化设计模型,利用MATLAB中的fmincon函数进行寻优计算,它可以同各种结构设计软件链接进行参数优化,如本文算例采用了中国建筑设计研究院开发的PKPM软件中已有的内力计算功能.最后,通过算例将各参数对造价影响程度进行分析比较,得出了定性及定量的结论,优化后的结构造价降低显著.与当前的钢筋混凝土框架结构优化设计相比,本文具有较强的实用性、寻优计算快捷等优点

Effect of ZnF2 Coating on Performance of LiNi0.5Mn1.5O4 Cathode Material for Lithium-ion Batteries

采用溶胶-凝胶法制备了LiNi0.5Mn1.5O4正极材料，并利用Zn F2对其表面进行包覆改性。XRD、SEM和TEM测试表明，包覆处理不影响材料的晶体结构，2%(质量分数，以LiNi0.5Mn1.5O4质量计，下同)的Zn F2在LiNi0.5Mn1.5O4表面形成了约7 nm厚均匀包覆层。对未包覆的LiNi0.5Mn1.5O4和1%、2%、3%的Zn F2包覆后的LiNi0.5Mn1.5O4的电化学性能进行了考察，发现Zn F2包覆能够减弱电解液与LiNi0.5Mn1.5O4正极材料之间的相互作用，稳定电极表面，提高材料的电化学性能。其中，2%Zn F2包覆样品表现出最佳的循环性能和倍率性能，0.2C电流倍率下循环200圈后，其放电比容量维持在109.0 m A·h/g，保持率为79.7%；5 C电流倍率下循环500圈后，放电比容量维持在94.2 m A·h/g，保持率为85.6%

高首效富镍正极材料LiNi0.6Co0.2Mn0.2O2的合成及电化学性能研究

采用共沉淀—高温固相烧结的方法合成了富镍正极材料LiNi0.6Co0.2Mn0.2O2（简称NCM622）,通过X射线粉末衍射（XRD）/Rietveld精修法、扫描电子显微镜（SEM）及电化学测试,对不同温度下合成材料的结构、形貌、电化学性能进行表征.结果表明,800℃下NCM622阳离子混排程度最低（1.97%）,首周库仑效率高达92.2%,100周容量保持率为81.4%.国家自然科学基金项目(No.21233004,No.21428303)资

Measurement Method of Logical Gate in Bulk Spin Quantum Computer

提出一种核磁共振量子计算机两量子位逻辑门测量的方案。该方案通过设置适当的标记量子位可显著缩减测量所需输入态数目,给出量子门和具体输入状态集合的实验脉冲序列。包含较少J偶合演化的脉冲序列设计可有效减少操作时间,削弱环境对量子系统的退相干影响。A scheme of measuring two-qubit logical gate is proposed based on nuclear magnetic resonance,which includes the specific input states and complete pulse sequences.In comparison with the approach not using ancillary qubit,this method remarkably reduces the number of the inputs at the cost of flag qubit resource.The pulse sequence with fewer J-coupling evolution can effectively shorten the experiment time and weaken the quantum system decoherence effect by environment.福建省自然科学基金(2008J0219;2009J05152

武夷山自然保护区郁闭稳定甜槠林与人为干扰甜槠林物种多样性比较

研究了武夷山自然保护区郁闭稳定甜槠林与人为干扰甜槠林的物种多样性 ,分别利用物种丰富度指数、Shannon- Wiener指数、Pielou均匀度和 Simpson指数作了比较。结果表明郁闭稳定甜槠林的物种丰富度为 11.370 4,Shannon- Wiener指数为 3.940 4,均匀度为 6 3.0 5 % ,Simpson指数为 6 .3740 ;人为干扰后的甜槠林的各项物种多样性指数值远比郁闭林高 ,分别为 2 0 .0 479、5 .5 431、78.44 %、2 1.716 3,其中灌木层与草本层所起的作用较大。利用群落优势度 (C)衡量了两个群落的稳定性 ,表明郁闭林的群落优势度远高于人为干扰林。而受到干扰的群落 ,阳性种入侵 ,阴性高大乔木待恢复 ,中等树木和幼苗尚存。演替过程中 ,群落物种多样性的增加是生态系统对外界轻度干扰的一种适应 ,是恢复生态系统稳定性的一种对策

The primary investigation of the value of whole body diffusion weighted imaging in diagnosis of metastatic tumor

背景与目的:随着临床上晚期肿瘤病例的增多,为了解治疗前、后全身转移瘤的大小及数量变化的实际情况,以往多采用分部位进行CT和(或)Mr扫描,少部分有条件的患者采用PET检查,但这些方法可能存在过多地暴露于射线、检查时间过长及经济负担过重等问题。因此,我们探讨磁共振的全身弥散加权成像(WHOlE bOdy dIffuSIOn WEIgHTEd IMAgIng,WbdWI)方法对肿瘤及转移灶的检出准确性及其临床应用的可行性。方法:对68例临床已发现原发肿瘤及多个转移灶或发现多个肿瘤病灶,但原发灶不明确的患者进行WbdWI检查,其中男性49例;女性19例。平均年龄61岁。68例均与CT和(或)MrI的检查结果进行比较,其中17例与PET的检查结果相比较。对病灶的检出率,以病灶长径大小分为:<1CM,≥1~<2CM,≥2~<3CM及≥3CM以上4组进行计数分析,同时,对不同部位间的病灶检出情况进行分析。结果:WbdWI对4组病灶的检出率分别为30%、78%、96%及100%。在各个部位的敏感性和准确性中以骨骼最高。对位于肺部小于1CM的病灶和位于颈部、盆腔小于2CM的淋巴结的诊断存在一定困难。结论:WbdWI对大范围的肿瘤病灶筛查是安全、简便、有效和经济的检查新方法。随着技术参数的进一步完善,WbdWI在发现和诊断全身多发肿瘤方面,具有良好的发展潜力。因此,本技术有望作为一种新的、效果好于PET的全身检查技术。Background and purpose:With the increased number of advanced tumors,it is important to evaluate the actual pre-and post-treatment changes in metastatic diseases,such as tumor size and tumor quantity.Previously,CT and/or MRI scan were usually applied,only a few patients could pay for PET(positron emition tomography).But there were several problems we should face,including redundantly exposure to radiation,too long verification time and heavy financial burden.Therefore we evaluated the application of whole body diffusion weighted imaging in diagnosing of tumor and metastatic tumor.Methods:sixty-eight patients(49 male,19 female,age from 29 to 84 years with mean age of 61 years) with a variety of tumors were investigated by combined CT and/or MRI scan,seventeen patients were compared with positron emition tomograph(PET).All tumors were classified into four groups,according to longest diameter of <1 cm,≥1-<2 cm,≥2-<3 cm and ≥3 cm.At the same time,the positive detection rates between different parts of the lesions were analyzed.Results:The detection rate of the four groups were 30%,78%,96% and 100%,respectively.The skeletal system had the highest sensitivity and accuracy in every part of body.There was difficulty in diagnosing lung cancer with longest diameter less than 1 cm as well as tumors located in neck and pelvic with longest diameter less than 2 cm.Conclusion:Whole body diffusion weighted imaging is secure,convenient,effective and economic for screening wide-ranging tumor focus.After improvement of parameters,WBDWI could be as a new effective whole body examination technique.厦门市科技计划项目(No:3502Z20074017

福建武夷山黄山松群落的氮、磷累积和循环

本文是福建武夷山森林生态系统研究的一部分，主要讨论黄山松（Pinustaiwanensis）群落的氮磷累积和循环。测定结果表明：（1）群落现存量中氮（N）、磷（P）的库量分别为925．844kghm-2和45．981kghm-2，其中地上部分别为719．438kghm-2（占总库量的77．706%）和35．534kghm-2占77.280％），地下部分别为206．406kghm-2（占22．294％）和10．447kghm-2（占22.720％）；（2）N、P的生物循环中，年吸收量分别为65．344kghm-2和2627kghm-2，年存留量分别为37．019kghm-2和1．695kghm-2，年归还量分别为28．325kghm-2和0.932kghm-2；（3）氮、磷的富集率分别为1．324和1．083两者均大于1，说明该群落对N、P仍在不断累积