STRUCTURAL MONITORING TECHNIQUES FOR XIAMEN XIANG'AN SUBSEA TUNNEL

海底隧道由于其特殊及地质环境的复杂性,为保证海底隧道钢筋混凝土的耐久性与结构服役能力,对其腐蚀状态进行监测尤为迫切。该文研究了翔安隧道钢筋腐蚀监测系统的设计,包括商用的以及基于电化学和物理方法的自主研发的腐蚀传感器,腐蚀监测断面与测点的布置、腐蚀传感器的安装,以及腐蚀数据库的建立。通过现场采集的腐蚀监测数据,评价了翔安海底隧道目前的腐蚀状况。最后介绍了基于超声导波的钢筋腐蚀监测研究新进展。Due to the particular and complex engineering environment of subsea tunnels, it is especially imperative to monitor the condition of steel corrosion in reinforced concrete(RC) of subsea tunnels for structural serviceability and durability of RC structures. In this paper, the largest excavation section subsea tunnel-Xiamen Xiang'an subsea tunnel is studied. Especially, the design of corrosion monitoring system is focused due to its complexity. Both the commercial corrosion sensors and the developed corrosion sensors based on electrochemical and fiber Bragg grating(FBG) techniques are adopted. The arrangement of the corrosion monitoring sections, their location, the installation of the sensors and the establishment of corrosion database are discussed. Then, the evaluation of corrosion in subsea tunnel is established based on the monitoring data of reinforced concrete collected in field. Based on the monitoring data collected in the field of the subsea tunnel, the status of stress and corrosion in Xiamen Xiang'an subsea tunnel can be evaluated. Finally, the promising technique based on ultrasonic guided waves for monitoring steel corrosion in RC is also discussed.国家自然科学基金项目(51378445);; 福建省闽江学者科研资助项目;; 中央高校基本科研业务费专项资金资助项目(20720160076

Research of Bubbles in Chinese A-share Market & Feedback Trading

股票市场泡沫问题一直是理论界和实务界关注的重点之一，历史的经验告诉我们，泡沫的破灭不仅可能酿成金融危机，而且可能给一国的经济带来沉重的打击。因此了解泡沫产生和破灭的机理，监测泡沫形成的程度，以及如何防范和抑制泡沫，对于维护金融稳定和促进经济发展都是具有重要的意义。本文的研究主要围绕着三个问题展开，并希望通过对这三个问题的解答，得到对稳定、发展我国A股市场做出合理的分析与政策建议。第一、关于资产泡沫的研究方法和研究领域种类繁多，本文将选择什么方法，采用什么研究领域来解释泡沫的生成和破灭的过程；第二、导致我国A股市场泡沫的产生和破灭的原因是什么；第三、实证检验是否支持该原因存在；第四、我国A股市场...Stock market bubbles are momentous financial events that are fascinating to academics and practitioners alike. Historical experiences teach us the break of bubble could be the disaster of economy of one country and lead to financial crisis. So it is of great significance to maintain financial stability and promote economic development that we know how the bubbles generate, how they exist, how to t...学位：经济学硕士院系专业：经济学院金融系_投资学学号：1562006115107

Effect of Exogenous NO on Germination in Cabbage under Salt Stress

以硝普钠作为外源一氧化氮(nitric oxide,NO)供体,研究NO对盐胁迫下小白菜种子萌发的影响.结果表明:小白菜在5‰盐度下生长情况最好;较高盐度(15‰)下,种子萌发和生长受到明显抑制,30‰盐度完全抑制种子萌发.较低盐度海水可以作为植物生长的营养液,促进小白菜种子萌发;外加0.01 mmol/L SNP能够提高白菜种子的发芽率、发芽指数.In this paper,effect of NO on germination of Cabbage under salt stress produced by SNP was studied.The results show that cabbage under salinity of 5‰ grows better than other salinities including control treatment.The development of cabbage was inhibited under salinity of 15‰,seeds of cabbage under 30‰ salinity couldn′t germinate.Low salinity of seawater could be used as nutritious solution for plants growth.We found that low concentration of SNP could increase germination rates and index significantly when cabbages were treated with various concentrations of SNP.国家自然科学基金资助项目(30271065,39970438,39870630

植物中的一氧化氮信号分子

综述了NO分子在植物中的生物合成、主要生理功能以及在耐受生物胁迫和非生物胁迫响应中的作用,以及植物对NO信号转导过程中cGMP途径和其他途径的关系。国家自然科学基金(30271065,39970438,39870630);; 福建省自然科学基金(D0210001

Nitric Oxide and Plant Stress Response

综述了NO分子在植物耐受生物胁迫和非生物胁迫中的作用,以及植物的NO信号转导过程中cGMP途径和其它途径的研究进展,并对以后的研究作一些展望。国家自然科学基金(30271065、39970438、39870630);; 福建省自然科学基金(D0210001)

美、日、法农业政策性金融体系比较

本文从美、日、法三国的农业政策性金融体系构成入手,归纳了三国农业政策性金融体系的主要特点,并对形成这些特点的三国社会经济背景进行了深入分析,以期对我国的农业政策性金融体系建设提供借鉴

中国贴牌企业创牌出路何在?

随着金融危机一周年的过去,何种经营模式才是目前中国企业走出危机、进一步发展所应该采取的这一问题越来越引起人们的关注。中国目前已成为全世界的加工工厂,贴牌企业在中国占主导地位,但此类型企业在此次金融危机中损失惨重。国家、社会普遍提倡走品牌之路,但是是否所有企业都适合走创牌之路;贴牌企业在创牌的道路上又会遇到哪些障碍——这些都是文章所探讨的内容

Advances in Salt-Tolerance Mechanism of Mangrove

从形态、生理生化和分子水平综述了红树植物的耐盐机理。红树植物具有盐腺、叶片肉质化等形态特征,通过离子选择性积累、盐分区域化、泌盐和拒盐等机制降低体内的盐分浓度,积累或合成渗透调节物质(主要是松醇和甘露醇)来维持渗透平衡,增强抗氧化系统以清除活性氧。在分子水平上,红树植物的耐盐能力与参与合成渗透调节物质关键酶和抗氧化酶等基因的表达相关。 【英文摘要】 This article summarized some research progresses of salt tolerance in mangrove species at morphology,physiology and biochemistry,and molecular levels.Mangrove species have salt glands and their leaves become succulent.They avoid heavy salt loads through a combination of selective accumulation of ions,ion compartmentalization,salt excretion and salt exclusion,accumulation or synthesis compatible solutes which are mainly pinitol and mannitol for maintaining osmotic balance,and promotion of antioxidative to sc...国家自然科学基金(30271065,39970438,39870630);; 厦门大学优秀人才支持计划(0000X07115)资助项

Eco-physiological effect of calcium imbalance caused by environmental acidification:A review

环境酸化是全球气候变化引起的主要问题之一,陆地和湖泊等生态系统受酸雨的长期影响,呈现出PH下降的趋势,而海洋生态系统也由于大气CO2浓度的急剧上升而出现酸化。环境的酸化对生态系统中CA的平衡造成巨大影响。在海洋生态系统中表现为,随着PH下降海水中CO32-浓度降低,富CA海洋生物无法维持其体内CACO3形成的硬质结构,造成珊瑚钙化生长变缓、翼足目软体动物外壳腐蚀穿孔等,影响其种群繁衍。另外,在陆地生态系统中,由于酸雨的长期淋溶,大量的生物可利用CA从生态系统中流失,动植物无法获得充足的CA来满足其生理需要。蜗牛、水虱等土壤及湖泊中高CA动物的生长、繁殖受抑制,鸟类也由于缺CA造成种群数量下降。陆地植物体内依赖于CA的信号转导系统也遭受严重干扰,进而影响光合、抗逆和繁殖等诸多生理过程,表现出不同程度的生产力、物种多样性下降和森林的衰退。环境酸化导致不同生态系统中CA循环失衡,大多表现出不利于富CA生物体的存活,这可能是一个较为普遍的生态学模式。Environmental acidification is one of the major problems caused by global climate change.Due to the long-term effects of acid rain,the pH of terrestrial and lake ecosystems presents a declining trend,and in the meanwhile,acidification of marine ecosystem also occurs because of the dramatic increase of atmospheric CO2 concentration.Calcium homeostasis in organisms or/and ecosystems can be disturbed by environmental acidification.In marine ecosystem,calcium-rich species will have difficulties in maintaining their external calcium carbonate skeletons,resulting in the declining of coral calcification and the corroding of pteropod shell.With the decrease of ocean pH and carbonate ion concentration,the reproduction of marine organisms may be declined.In terrestrial ecosystem,organisms cannot absorb enough essential calcium because large quantity of bio-available calcium has been depleted from the ecosystem by the long-term acid rain.Therefore,anthropogenic acidification has caused the decline in calcium-rich species populations such as snail and Daphnia in soil and fresh waters,and birds also have low reproductive success as a result of calcium deficiency under long-term acid rain stress.In plants,acid rain disturbs calcium signal transduction cascades,and further,negatively affects physiological processes such as photosynthesis,stress-resistance,and reproduction,with the ecological consequences such as primary productivity and biodiversity decrease and forest decline.It may be a universal ecological pattern that calcium-rich species will be much more difficult in survival under the scenario of calcium homeostasis in ecosystems being disturbed by environmental acidification.国家自然科学基金项目(30670317;30770192);教育部博士基金项目(20070384033);留学回国人员科研启动基金项目(2008-890);厦门大学新世纪优秀人才基金项目(NCETXMU07115);“长江学者和创新团队发展计划”资助项

一株菲降解细菌的筛选及其降解条件的优化

多环芳烃(PAHs)是指两个或两个以上苯环的疏水性芳香族化合物。在环境中多数PAHs具有难降解性、致癌性、致畸性和致突变性,受到了关注。PAHs随三废排入环境中的量逐年增加,造成长期、广泛的污染。菲为三环多环芳烃代表物,生物降解是污染环境中菲去除的主要途径(韩清鹏等,2003;徐虹等,2004;周乐等,2005;Boldorn,et al.,1993;Cho et al.,2001;Goyal et al.,1996)。研究表明鞘氨醇单胞菌属能很好消除PAHs污染(Cho et al.,2001;Fredrickson et al.,1995;Kim et al.,2000),但