Non- linear analysis on the performance of buckling restrained brace concrete school building

本文以一个中小学校舍抗震加固设计的实际工程为例,研究的目的是分析防屈曲支撑的滞回曲线,采用非线性时程分析的方法,简单介绍防屈曲约束支撑在MIdAS软件中非线性时程分析的应用过程,得到防屈曲支撑的滞回曲线与试验的滞回曲线相吻合。Taking an actual school building's seismic design as an example,The purpose of the study is the analysis of buckling- restrained brace hysteretic curve,Method using nonlinear time- history analysis,Application of nonlinear dynamic analysis in MIDAS software,the buckling restrained brace against simple introduction,Get buckling- restrained brace hysteretic curve and the experimental hysteretic curves coincide

To Decipher the Ocean Carbon Sink Through Interdisciplinarity and the Integration of the Past and Present

海洋是地球上最大的活跃碳库,发挥着全球气候变化“缓冲器“的作用,研究海洋碳循环过程与储碳机制是当前的国际热点。然而,地球系统的复杂性注定了这个重大命题必须通过学科交叉、古今结合才能取得较全面的认识和新的突破。The ocean is the world's largest active carbon pool and buffers global climate change.Current scientific research focuses on ocean carbon cycling and carbon sequestration mechanisms.The new cognition can be successfully reached only through interdisciplinary and integrative studies of the past and present oceans.国家重大科学研究计划项目“海洋微型生物碳泵储碳过程与机制研究”(编号:2013CB955700); “南海深海过程演变”重大研究计划集成项目“南海碳循环与生物学储碳机制集成研究”资

Damage to mangroves from extreme cold in early 2008 in southern China

通讯作者Author for correspondence (E-mail: [email protected])2008年初,我国南方19个省经历了50年一遇的持续低温雨雪冰冻天气。极端气候对华南沿海各省的红树林区造成不同程度的危害。2008年3月,在我国南方各省红树林区的10个代表性地点,对这次寒害造成的红树植物伤害程度进行了系统的调查。结果表明:冬季低温对红树林的影响极为显著,特别是在低纬度的海南、广西和广东湛江,由于极端低温正值夜间退潮,对红树林的影响更为显著;在纬度较高的福建,本地红树种类秋茄(Kandelia obovata)、桐花树(Aegiceras corniculatum)和白骨壤(Avicennia marina)及引种的木榄(Bruguiera gymnorrhiza)等,由于长期适应于冬季较低的气温或在种植前经过抗寒锻炼,具有较强的抗寒能力。各地主要红树植物中,广布种秋茄、桐花树和白骨壤最为耐寒,其耐寒性均大于红树科的木榄、海莲(Bruguiera sexangula)和红海榄(Rhizophora stylosa)。海桑(Sonneratia caseolaris)对温度的敏感性最强,抗寒能力最低,因此,即使在其原产地海南也受到较为严重的寒害,在纬度更高的引种地出现大面积受害甚至全部死亡,而从孟加拉国引种的无瓣海桑(Sonneratia apetala)却显示出一定的抗寒能力。同一地点的红树植物幼苗的抗寒能力低于大树。此次寒害也造成了苗圃场的种苗大量死亡,成熟的植株提前落花落果,这势必会影响后继一两年内红树林的自然更新和人工造林。因此,在未来红树林造林或人工引种中,一定要考虑到红树植物的抗寒能力。国家自然科学基金(30671646和30700092);厦门大学“闽江学者”启动基

虹桥交通枢纽连续钢箱梁制作技术

本文通过对连续钢箱梁的加工制作,介绍了大跨度双曲面型钢桥梁的制作流程及控制要点,从图纸深化设计、下料组装、胎架搭设、焊接等多道工序较详细地阐述了连续钢箱梁的制作技术,对构件制作工艺流程、结合工程实例及工厂制作条件所采取的反造法施工技术以及构件的分段方案等进行了详细的论述。另外还指出在制作过程中需注意的控制点及解决方案,给出完善施工管理和改进技术的措施,为类似结构制作起到参考作用

Isolation and Properties of a High Rate H_2-producing Thermoduric Bacteria Strain

从高温环境中分离得到具有高产氢活力的微生物菌株,经16SrRNA基因序列分析及生理生化特性分析,鉴定该菌株为Proteussp.该菌株能以葡萄糖、蔗糖、麦芽糖、乳糖和淀粉等多种有机物为底物催化产氢.该菌株利用葡萄糖产氢的最适条件为:葡萄糖浓度0.1mol/L;菌体细胞密度OD600=0.60;反应系统起始pH值7.0;反应温度40℃.在该条件下菌株的最高产氢活性可达8.05μmolH2/h·mgprot.A thermoduric bacteria strain with high H2producing activity was isolated from high temperature environment. It was identified to be Proteus sp. by the analysis of sequence of 16S rRNA gene and its physiological properties. The thermoduric bacteria Proteus sp. could use different organic substrates such as glucose, sucrose, maltose, lactose and soluble starch for H2production under fermentative conditions. And glucose was the favorite substrates for H2production. The optimum conditions for Proteus sp. H2production were: substrate concentration: 0.1 mol/L glucose; cell density: OD600=0.6; starting pH:7.0; reaction temperature:40℃. Under the optimum conditions, the maximum H2production activity reached 80.5 μmol H2/h·mg prot.The results suggest that Proteus sp. is an ideal material for biological H2production.国家863项目(2001AA515040);; 国际科技合作重点项目(2002AA515030);; 国家自然科学基金(302703228)资