水下亚波长广角声单向传输结构设计与优化

利用传递矩阵法,基于流固超晶格的单元传递矩阵,计算并分析了无限周期流固超晶格的能带结构以及有限周期级联超晶格的透射谱。在此基础上,耦合一维周期性矩形声栅与级联超晶格,构造了水下亚波长广角声单向传输结构,揭示了其广角声单向传输机制。有限元仿真结果表明,该结构能够实现约20°广角入射声波的单向传输效应,同时还具有宽频带、高整流比等特性。通过优化声栅单元的方位角,有效地提高了结构的正向导通率。本文结果突破了基于声子晶体的声单向传输设计中面临的"波长-尺寸"限制,有助于水下声整流器件朝着小型化和集成化方向发展。国家自然科学基金青年项目(11604128)水声技术重点实验室装备预研基

HARMONY of URBAN AND RURAL PLANNING: ON PRACTICAL SIGNIFICANCE of HARMONY IDEA AND RECONCILIATION SYSTEM IN TRADITIONAL CHINESE CULTURE

深入分析了传统文化中的和谐理念以及相应的和解制度,并结合当下城乡规划制定和实施的实际情况,探讨了传统和谐理念及和解制度的现实意义。The paper conducts an in-depth analysis on the harmony idea and reconciliation system in traditional Chinese culture.Based on the actual results of plan formulation and implementation, the paper explores the practical significance of harmony idea and reconciliation system.厦门大学引进人才科研启动项目阶段性成果; 中央高校基本科研业务费专项资金资

奇异二阶三点边值问题的正解

应用锥中的不动点定理研究奇异二阶三点边值问题的正解的存在性·　采用一种构造Green函数的方法为出发点 ,利用分段定义算子的手法讨论更一般的奇异二阶三点边值问题·　得到了一个正解的存在性定理·　其中的非线性项可以是变号的·江苏省教育基金资助项

STUDY ON INEVITABILITY AND CORRESPONDENCE of ADMINISTRATIVE PENALTY FOR ILLEGAL CONSTRUCTION

深入分析了改革开放以来违法建设行政处罚制度的发展过程,指出当前违法建设难以遏制的制度根源就是行政处罚缺乏必定性和相当性,只有解决了这一问题,才可能从根本上改变违法建设的严峻局面。The paper analyzes in depth the development process of administrative penalty institution on illegal construction since the reform and opening up of China,and then points out that the institutional root for the failure to control the illegal construction lies in that the administrative penalty lacks inevitability and correspondence.Only solving this problem can the serious situation of illegal construction be altered fundamentally.国家自然科学基金项目(51208444

POSITIVE SOLUTIONS TO A SINGULAR SECOND ORDER THREE-POINT BOUNDARY VALUE PROBLEM

the Educational Foundation of Jiangshu Provinc

The Relationship between Financial System Structure and Economic Freedom——A Study Based on the data of 139 Countries during 1980-2013

本文基于全球139个国家1980~2013年的面板数据,采用系统动态gMM的估计方法,研究一国经济自由程度对于金融体系的活力、相对规模与效率的影响。研究结果表明,伴随着国家对金融系统管制的放松、对产权的有效保护以及贸易带来的经济增长,金融体系结构的活力、相对规模与效率都会增加,从而证实了一国经济自由程度会影响金融体系结构的演变和发展。Based on the panel data of world's 139 countries during 1980-2013, this paper uses the dynamic GMM estimation method to analyze the influence of a country's economic freedom degree on the vigor, relative size and efficiency of the country's financial system structure.The results of the paper show that, along with the country relaxing the regulation of financial system, the effective protection of property rights and the economic growth due to trade, the vigor, relative size and efficiency of financial system structure will increase, so it is confirmed that a country's economic freedom degree will affect the evolution and development of the country's financial system structure.国家社科基金青年项目“金融生态环境与技术创新空间集聚效应的机制研究与对策建议”(15CJL052); 教育部哲学社会科学研究重大课题攻关项目资助“要素成本上升背景下我国外贸中长期发展趋势研究”(13JZD010); 中央高校基本科研业务费专项资金资助(T2013221016); 厦门大学两岸关系和平发展协同创新中心科研经费支

The development of online detecting system of five-axis CNC grinding machine for indexable insert

五轴可转位刀片磨床具有高速、高精的特点,为了使所磨的刀片符合精度要求,需要针对刀片的尺寸开发一种在线检测系统。本文所介绍的在线检测系统主要由两方面构成:一是在磨床数控系统中将测头伸缩时发出的电压信号转换为测量值;二是建立刀片尺寸的加工模型。在线检测系统通过调用系统的测量宏程序,获取刀片测量值,将此测量值输入到加工模型中,得到所加工刀片的指导尺寸。通过实验,得到了刀片的指导尺寸和测量时间,验证了此在线检测系统是可行并且可靠的。The five-axis CNC grinder of indexable insert is characterized by high-speed and high-precision.,in order to meet the accuracy requirements of grinding blades, needed an online detection system developed for the size of the blade.The online detection system described in this article consists of two aspects: First, the voltage signal that when the probe telescopics will be converted to the measured value; Second, establishing the process model of the blade size.The online detection system will get the blade measurements by calling the measure macro, then the measured value input into the process model, obtaining the guidance blade size.Through the experiment, verifying this online detection system is feasible and reliable by the obtained guidance blade size and the measuring time.国家“高档数控机床与基础制造装备”科技重大专项资助(2010ZX04001-162

东山岛植被资源和物种多样性特征

调查100块样地共1hm2并野外植被填图，岛上含维管植物84科160属184种，植物区系为热带、亚热带分布成分占总属数85．7％。对岛上16个群落中的植物种数和个体数作了物种丰富度指数D1、多样性指数D2、优势度指数D3、均匀度J等统计，其中相思树群落上述指数依次为8．124、12．502、2．878和71．93％；马尾松群落为8．676、18．468、3．354、83．13％，黑松群落为8．464、11．290、2．732、67．61％。说明该3个群落为相对稳定性较大的群落。各群落乔木种类4种指数变化幅度依次为0．185～2．012、1．017～2．628、0．078～1．006、11．25％～96．39％。灌木层上述指数变化幅度依次为1．083～4．468、2．014～16．028、1．006～2．687、57．49％～96．01％。显示了灌木层种类较为丰富，多样性较高，岛上植物属于闽粤沿海丘陵平原亚热带雨林区

广州戊型病毒性肝炎暴发株和散发株部分序列比较

目的了解广州某部新兵连戊型病毒性肝炎(戊型肝炎)暴发流行的分子病毒学特征,并与当地散发毒株比较,以查找病原可能来源。方法用逆转录聚合酶链反应(RT-PCR)法,对抗HEV-IgM阳性的34例暴发性戊型肝炎及46例散发性戊型肝炎患者的血清和粪便标本进行HEVRNA检测,并对HEVRNA阳性标本的基因开放读码框(ORF)2部分片段进行克隆测序分析。结果34例暴发流行病例标本中检测出12株病毒,46例散发病例标本中检到2株。经克隆测序分析,各暴发毒株的核苷酸同源性为95.3%~100%;氨基酸同源性为94.0%~100%。且暴发毒株和散发毒株的核苷酸及氨基酸的同源性也较高,分别为95.3%~99.3%和94.0%~100%;暴发毒株和散发毒株与各型中的标准株相比,与Jap1株同源性最高,其核苷酸同源性为92.0%~95.3%,氨基酸同源性为96.0%~100.0%。进化树分析提示本次戊型肝炎暴发流行病毒株与戊型肝炎病毒基因Ⅳ型距离最近。结论本次戊型肝炎暴发流行的病原可能来于广州本地;广州地区戊型肝炎流行毒株属戊型肝炎基因型Ⅳ型