A Proposal of Suspension Type Energy Absorber System for Bridge Structures

A suspension type energy absorber system was proposed in this paper for use in the design of highway bridge structures, in order to prevent catastrophic failures as had been seen in the Hyogoken-Nanbu Earthquake. The eigen frequency of the proposed system was first examined through theoretically determined closed form solutions. Dynamic response analyses were then carried out by use of one-dimensional mass-spring systems for a few different types of bridge structure, including currently used conventional laminated rubber type absorber to be compared. It was concluded that the proposed absorber system can be one of practically useful measures to dissipate excessive energy accumulated in the structure during earthquake, though several points are still remained to be solved in the actual design

HYDROLOGICAL OBSERVATION IN AN EVERGREEN BROAD LEAVED FOREST IN THE WUYI MOUNTAINS

[中文文摘]对武夷山甜槠林成熟林水文学效应的研究结果表明：观测期间，年大气降水量2678.78ｍｍ，林内雨量2182.04ｍｍ，林冠截留量为496.74ｍｍ；林内雨中，穿透雨量2082.08ｍｍ，树干茎流99.96ｍｍ；到达甜槠林地作用面的林内雨量中，被地表枯枝落叶层截留的雨量为159.84ｍｍ，地表径流量11.6ｍｍ，地下渗流量109.32ｍｍ，其余林内雨量形成土壤含水量增量并由地表物理蒸发、根系吸收以及植物蒸腾所消耗；甜槠林地o~20０ｃｍ土层水分初渗率78.6ｍｍ·ｍｉｎ－１，稳渗率１５．５ｍｍ·ｍｉｎ－１，达到稳渗历时４５ｍｉｎ，地表枯枝落叶最大持水量5.2ｍｍ，土壤蓄水量154.0ｍｍ。与国内其它地区不同类型的森林相比较，武夷山甜槠林具有较强的水文学效能。[英文文摘]Hydrological observations were made in a 76 year old Castanopsis eyrei forest of the Wuyi Mountains.The results are as follows:(1)In the study period during 1993～1994,annual gross precipitation,net precipitation (throughfall was 208204mm and stemflow was 9996mm)and interception loss were 267878mm,218204mm and 49674mm respectively.Interception rate was 1845%.(2)Net precipitation,the part of gross precipitation appearing on the forest floor,was redistributed through different routes.The part absorbed by litter layer was an annual amount of 15984mm,and accounting for 733%.The parts as surface runoff and below ground drainage were annual amounts of 116mm and 10932mm respectively,and accounting for0.53% and 5.01%,respectively.The rest was kept in soil and then lost to the atmosphere by means of ground physical evaporation or plant transpiration as absorbed by the roots.Its amount was 190128mm,and accounting for 87.13%.(3) The initial infiltration rate and stable infiltration rate for the soil layer of 0～20cm were 786mm·min-1 and 155mm·min-1 respectively.The time needed to arrive at the stable state was 45min.Water storage capacity of soil was 15041t·hm-2.The maximum water holding capacity of litter layer was 52mm.福建省自然科学基金,武夷山自然保护区管理局资

Nutrient requirements and development of formulated diets of mud crab,Scylla sp.

【中文摘要】 青蟹属(Scylla)有锯缘青蟹(Scylla serrata),拟穴青蟹(S.paramamosain),紫螯青蟹(S.tranquebarica)和榄绿青蟹(S.olivacea)等4个种。我国以拟穴青蟹占绝对优势,它有个体大、生长快、适应性强、肉味鲜美、营养丰富等特点,已成为具有重要经济价值的海水养殖蟹类之一。随着青蟹人工育苗技术的突破、养殖技术的改进和多种养蟹形式的开发,养蟹业得到了蓬勃发展,其养殖规模不断扩大,产量不断提高,据统计,2004年全国青蟹养殖产量已达10.85万吨。养蟹产业的形成和持续发展必然要走健康养殖的道路,而健康养殖除了供应高质量苗种和保持良好的养殖环境外,必须供应量足质优的饲料,以满足青蟹的营养需求。然而,尽管我国青蟹养殖已有100多年的历史,但对其营养需求研究和配合饲料研发起步较晚,国外的相关研究也较少,故目前市场上尚未生产出能满足其正常生长发育所需营养需求的配合饲料,养蟹所用的饲料主要是天然低质鱼、虾、贝类等。鲜杂鱼等天然生物饵料资源有限,供应不稳定,使用不方便(需要冷冻保存),营养不全面,自身携带病原菌,且投喂后容易腐烂分解,败坏水质,易导致病害蔓延,难以满足日益扩大的养蟹... 【英文摘要】 The mud crab,Scylla sp.,is an important crustacean species farmed on a commercial scale in China.They are polycultured with fish or shrimp,but mud crabs are now monocultured in increasing density to supply the growing market.This trend has made diet development more important.Information on the nutrients required for growth of mud crabs is vital for the formulation of an effective feed.This paper reviews the current knowledge on Scylla sp.nutrition with special reference to developments during the last deca...国家“八六三”计划项目(2002AA603013); 厦门大学高层次人才引进科研启动项目; 厦门大学“九八五”计划科技创新项目“青蟹亲体脂肪酸营养与幼体发育关系研究

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

2018年安溪珠塔内窑调查报告

2018年5月至7月,厦门大学历史系考古专业、福建博物院文物考古研究所及安溪县博物馆等单位联合组成\"安溪古窑址调查队\",对安溪珠塔内窑进行了全面的调查,基本了解珠塔内窑古窑址分布与保存情况,采集了一批明末清初的青花瓷器、白瓷与窑具标本,并发现部分窑炉遗迹,为研究闽南地区青花瓷窑业发展提供了第一手资料

浦城县大口窑调查勘探报告

浦城县大口窑是宋元时期闽北地区一处著名的窑场,以烧造青白瓷为主,此外还兼烧部分酱釉瓷、少量绿釉瓷等。器型种类丰富,质量较高,窑业技术与江西景德镇窑关系密切。其产品在东亚、东南亚等地有发现,是福建一处重要的外销瓷生产地

漳浦县石寨窑发掘简报

漳浦县石寨窑址是闽南一处专门仿烧龙泉青瓷的窑场,从元代开始,一直延续到明初。其产品种类较少,釉色比较丰富。窑业技术颇具特色,出现了介于分室龙窑和横室阶级窑之间的窑炉结构,对研究闽南地区横室阶级窑的起源与发展具有重要意义

鲴类寄生六鞭毛虫系统发育的研究

利用分支系统学（Ｃｌａｄｉｓｔｉｃｓ）的原理和方法，选取光镜下的２４个性状，对鲴亚科１７种寄生六鞭毛虫进行了系统发育分析，初步阐明了这１７种六鞭毛虫相互间的亲缘关系。结果还表明，鲴亚科寄生六鞭毛虫的分化较晚；一些明显特征：如杆状条纹，是进化适应的结果，具有系统学意义。还通过对寄生六鞭毛虫在鲴亚科鱼类中的区系分布特点分析，探讨了宿主相互间的亲缘关系。结果表明：寄生六鞭毛虫的区系分布能够反映宿主相互

鲴类寄生六鞭毛虫系统发育的研究

利用分支系统学（Cladistics）的原理和方法，选取光镜下的24个性状，对鲴亚科17种寄生六鞭毛虫进行了系统发育分析，初步阐明了这17种六鞭毛虫相互间的亲缘关系。结果还表明，鲴亚科寄生六鞭毛虫的分化较晚；一些明显特征：如杆状条纹，是进化适应的结果，具有系统学意义。还通过对寄生六鞭毛虫在鲴亚科鱼类中的区系分布特点分析，探讨了宿主相互间的亲缘关系。结果表明：寄生六鞭毛虫的区系分布能够反映宿主相互间的亲缘关系。湖北圆吻鲴应划规鲴属。在鲴亚科中，似鳊和圆吻鲴的分化较早