Economic Foundation of Currency Cooperation in East-Asia:Analysis of Economic Integration Level Based on OCA Index

本文利用最优货币区指数模型就1983-2007年的样本数据进行回归,在此基础上采用1996年和2007年的截面数据计算并比较东亚地区各主要经济体的双边OCA指数,以期纵向分析东亚地区经济一体化水平的动态变化。结果表明,东亚经济一体化水平较亚洲金融危机前有所提高,货币合作成本降低,同时其内部已经形成以东南亚国家为主体的小型经济区,在区内先行开展货币合作具有较强可行性。This paper tests the sample data(1983-2007)based on Optimum Currency Area(OCA)Index model and compares bilateral OCA index among major economies in East-Asia with cross-section data of 1996 and 2007 year,in order to analyse vertically dynamic change of East-Asian economic integration level.The conclusion shows that there is higher level of East-Asian economic integration than that before the Asian financial crisis,which may reduce currency cooperative cost,while one small-scale economic area is being formed composed of several Southeast-Asian countries where early currency cooperation should be carried out as soon as possible.2009年度北京师范大学青年教师人文社科研究基金的资

分子筛修饰电极中内电子传输机理的研究

【中文摘要】用电化学方法聚合分子筛孔道内的苯胺 , 以聚苯胺分子筛修饰电极为模型研究分子筛修饰电极的内电子传输机理 . NaY分子筛的离子交换点位被苯胺修饰后 , 通过电聚合制得聚苯胺分子筛修饰电极 ( Pan+Y-ZM E ),该电极通过聚苯胺链自身的电子跳跃来实现电子传输 , 且只有通过阴极富集后对溶液中Cd 2+才有响应 ,并能用于测定抗坏血酸。【Abstract】This paper is concerned with the mechanism of intrazeolite electron transfer in zeolite-modified electrodes (ZMEs) where the zeolite have been modified with polyaniline, First, data were obtained from ZMEs prepared with zeolite-Y loading aniline and the electropolymerizing of anilines was performed by cyclic voltammery, Polyaniline might not leak out from zeolite due to the bulk size of polyaniline being bigger than the channel of zeolite-Y. At the absence of electron transfer mediators, the Pan(+)Y-ZME showed the expected presence of electron hopping of adjacent polyaniline cations, Second, the data were obtained for the determining Cd2+ and ascorbic acid using Pan+Y-ZME. The Cd2+ might not be preconcentrated at open circuit and could be done at constant potential. At the absence of ion exchange between zeolite and surrounding electrolyte the electron transfer was performed via the electron hopping, i. e. by an intrazeolite mechanism; rather than by an extrazeolite mechanism. In addition, the ascorbic acid molecule and its anion could not cross zeolite film to base electrode therefore, its current was conducted also by the electron hopping between the chains of polyaniline, Experimental results indicate that the electron transfer of Pan(+)Y-ZME was dominated by intrazeolite processes

蜗杆传动中蜗轮材料的研究进展

蜗杆传动因其具有传动比大、结构紧凑、传动平稳等优点，被广泛应用于机械制造领域。蜗杆传动中，青铜是蜗轮最常用的材料。为解决青铜蜗轮耐磨性差、疲劳强度低、齿面胶合等问题，青铜蜗轮替代材料的研究受到越来越多的关注。综述了蜗杆传动中蜗轮常用的金属材料以及青铜蜗轮替代材料的研究进展。针对国内外文献报道中用于替代青铜蜗轮的钢制蜗轮、铸铁制蜗轮、锌铝合金制蜗轮、塑料制蜗轮进行了重点论述。最后，结合蜗轮材料的研究现状，从材料、表面工程技术和涂层制备三方面提出了展望性的建议

进展中的原生动物学研究热点领域与新格局

原生动物是一大类动物性单细胞真核生物.其高度特化的细胞结构与生理特征,独具的进化地位以及与环境、资源、人类健康和动物疾病间的密切关系,特别是其兼具的&ldquo;细胞&rdquo;与&ldquo;动物&rdquo;这个二元性统一体特性,使得以原生动物为模式或对象的研究在以细胞学、遗传学、适应与进化为代表的基础生物学、环境生物学、人类的健康与疾病防治、水产养殖及畜牧业等应用学科均具有十分广泛的科学意义和重要的应用价值.半个多世纪以来,伴随着研究队伍的不断壮大和发展,我国的原生动物学研究从早期经典的分类学、寄生虫学、生态学,逐步拓展到今天全面、深入地涉足涵盖基础与应用生物学各学科分支领域.在最近的几十年中,我国聚焦在海洋纤毛虫的多样性与系统学、表观遗传学、细胞生物学、比较基因组学、以寄生原虫为核心的免疫生物学、病害生物学、以鞭毛虫为核心的进化生物学、以海淡水纤毛虫和阿米巴等为核心的原生动物生态学等方向并取得了全面和长足的进展,许多代表性成果处于该领域国际前沿水平.本文扼要陈述了我国原生动物学各主流团队近年来的工作进展,介绍了该领域当前的研究热点和前沿性科学问题,同时对相关领域未来的发展进行了前瞻性描绘和规划.</p

进展中的原生动物学研究热点领域与新格局

原生动物是一大类动物性单细胞真核生物.其高度特化的细胞结构与生理特征,独具的进化地位以及与环境、资源、人类健康和动物疾病间的密切关系,特别是其兼具的“细胞”与“动物”这个二元性统一体特性,使得以原生动物为模式或对象的研究在以细胞学、遗传学、适应与进化为代表的基础生物学、环境生物学、人类的健康与疾病防治、水产养殖及畜牧业等应用学科均具有十分广泛的科学意义和重要的应用价值.半个多世纪以来,伴随着研究队伍的不断壮大和发展,我国的原生动物学研究从早期经典的分类学、寄生虫学、生态学,逐步拓展到今天全面、深入地涉足涵盖基础与应用生物学各学科分支领域.在最近的几十年中,我国聚焦在海洋纤毛虫的多样性与系统学、表观遗传学、细胞生物学、比较基因组学、以寄生原虫为核心的免疫生物学、病害生物学、以鞭毛虫为核心的进化生物学、以海淡水纤毛虫和阿米巴等为核心的原生动物生态学等方向并取得了全面和长足的进展,许多代表性成果处于该领域国际前沿水平.本文扼要陈述了我国原生动物学各主流团队近年来的工作进展,介绍了该领域当前的研究热点和前沿性科学问题,同时对相关领域未来的发展进行了前瞻性描绘和规划

Measurement of integrated luminosity of data collected at 3.773 GeV by BESIII from 2021 to 2024

We present a measurement of the integrated luminosity e+e- of collision data collected by the BESIII detector at the BEPCII collider at a center-of-mass energy of Ecm = 3.773 GeV. The integrated luminosities of the datasets taken from December 2021 to June 2022, from November 2022 to June 2023, and from October 2023 to February 2024 were determined to be 4.995±0.019 fb-1, 8.157±0.031 fb-1, and 4.191±0.016 fb-1, respectively, by analyzing large angle Bhabha scattering events. The uncertainties are dominated by systematic effects, and the statistical uncertainties are negligible. Our results provide essential input for future analyses and precision measurements