Experimental investigation on seismic behavior of single piles in sandy soil     

Werasak Raongjant 《地震工程与工程振动(英文版)》2011,10(3)

This paper describes a quasi-static test program featuring lateral cyclic loading on single piles in sandy soil. The tests were conducted on 18 aluminum model piles with different cross sections and lateral load eccentricity ratios, e/d, (e is the lateral load eccentricity and d is the diameter of pile) of 0, 4 and 8, embedded in sand with a relative density of 30% and 70%. The experimental results include lateral load-displacement hysteresis loops, skeleton curves and energy dissipation curves. Lateral cap...  相似文献   

实验研究碳酸盐岩储层烃类包裹体不混溶捕获行为   总被引：2，自引：0，他引：2  

陈勇  葛云锦  周振柱 《地球化学》2011,(6):536-544

认识储层烃类包裹体的捕获机制对于解释包裹体分析结果有着重要的意义.通过人工合成烃类包裹体实验,对碳酸盐岩储层烃类包裹体的不混溶捕获现象进行了探讨.通过对人工合成烃类包裹体的显微荧光、均一温度测试和拉曼光谱分析,对不混溶包裹体内捕获的物质进行了辨别.根据包裹体的相态特征和实验分析结果,可以将实验合成的不混溶包裹体归纳为两...  相似文献   

小秦岭金矿田稀土元素地球化学特征     

冯建之 《矿产与地质》2011,25(3):217-226

文章根椐小秦岭金矿田稀土分析结果,总结了各地层岩石单元、岩浆岩及矿床稀土元素地球化学特征及规律,对太华群主要变质岩进行了原岩恢复,分析了燕山期花岗岩文峪岩体和娘娘山岩体生成构造环境及其与成矿的关系.通过主要矿床稀土元素地球化学特征对比,指出区内大湖钼金矿床与其它金矿床的成矿差异,认为小秦岭金矿成矿物质来源为变质岩中的斜...  相似文献   

Feeding ecology of Ammothella longipes (Arthropoda: Pycnogonida) in the Mediterranean Sea: A fatty acid biomarker approach     

Anna Soler-Membrives  Sergio Rossi  Toms Munilla 《Estuarine, Coastal and Shelf Science》2011,92(4):819-597

Fatty acid analysis has proved valuable in determining seasonal trophic links and the feeding behavior in organisms in which these diet and trophic links cannot be inferred from stomach content analyses. Seasonal variations in total free fatty acid content (TFFA) and fatty acid composition of seston (<250 μm), the brown macroalgae Stypocaulon spp., polychaetes (Nereididae) and the pycnogonid Ammothella longipes have been used to establish their trophic links, with particular focus on seasonality and feeding ecology of A. longipes. Samples were collected in a coastal environment (NW Mediterranean Sea) at 7–10 m depth, in five different periods (August and October 2008, February, June and September 2009). Seston and Stypocaulon spp. samples did not show significant seasonal variations in TFFA content, while nereids showed a significant variation. Analysis of fatty acid profile showed high similarities of fatty acid composition between seston and Stypocaulon spp. Nereids were closer to seston and Stypocaulon spp. than A. longipes, which seemed to follow a seasonal trend. The results of this study reveal that A. longipes may change its feeding behavior depending on the season and available food. This pycnogonid species appears to be carnivore during spring and early summer but seems to feed on detritus when availability of prey diminishes during winter. Notable high amounts of odd-chain fatty acids are found in summer–autumn for this species, which may come from bacteria acquired from the detrital diet or from de novo biosynthesis from propionate. The results obtained provide new and valuable data on the understudied feeding biology of pycnogonids in general, and contribute to the understanding of their functioning of Mediterranean shallow oligotrophic systems and their trophic links.  相似文献   

浅海重力式海洋平台抗震试验研究     

周洋  魏巍  何继明 《中国海洋大学学报(自然科学版)》2011,(Z1):420-424

随着西太平洋区域板块边缘地震活动性的逐步增强,浅海重力式海洋平台遭受地震破坏的风险正逐渐加大。本文的主要工作是利用大型振动台,采用1∶25相似比的有机玻璃材料试验模型,施加人工质量,试验研究了带裙板的浅海重力式海洋平台在基底地震动输入下的动力反应及其规律。试验结果显示平台总体抗震性能尚可,平台在双向地震动输入下抗扭能力差,建议予以重点加强。  相似文献   

城市旅游空间行为路径分析及优化——以南京市为例   总被引：1，自引：0，他引：1  

张骏  古风  卢凤萍 《地理与地理信息科学》2011,27(1):85-89

城市旅游空间行为路径是旅游者在目的地城市区域内的空间移动轨迹,以典型旅游城市南京市为例,可总结出现有旅游流行为路径特征的弊端及其形成原因,并在此基础上提出通过旅游线路重组、旅游营销升级、旅游活动开展等策略实施空间行为路径优化,即:远距离客源由"单节点式"向"多节点式"路径转化;邻省客源由"线形旅游"向"环形旅游"路径转化;省内客源由"链式旅游"向"轴线辐射形旅游"路径转化;城市原住民由"单节点式"向"基营式旅游"路径转化。通过对旅游流空间行为路径的科学引导促进城市旅游的全面、健康发展。  相似文献   

Daily activity and thermoregulation in predator-prey interaction during the Flowering Desert in Chile     

M.A. Vidal  J. Pizarro-ArayaV. Jerez  J.C. Ortiz 《Journal of Arid Environments》2011,75(9):802-808

We studied how features of thermal resources affect the patterns of activity of predator (Callopistes maculatus) and its prey (Gyriosomus batesi and Gyriosomus subrugatus) during the phenomenon of the Flowering Desert in Chile. We predict that restrictions or variations in temperature affect mainly the activity of insects, and that this variation in the activity of insects affects the patterns of activity of the predator. The daily activity of the three species was bimodal, but both prey species disappear when temperatures exceed 40 °C. According to our results, the prey are thermoconformers to air and substrate temperature, whereas the predator is a thermoregulator to environmental conditions by their independence of air and substrate temperature.  相似文献   

公众对低碳旅游的认知、意愿及行为特征分析——以佛山市为例   总被引：1，自引：0，他引：1  

汪清蓉  李飞 《热带地理》2011,31(5)

采用问卷调查和现场访谈方法,对2 756份调查问卷进行分析发现:(1)公众对低碳旅游认知不够深入,具有学历、收入和职业差异.(2)大部分公众愿意学习并实践低碳旅游,其参与意愿具有学历和职业差异,但对于旅游结束后计算“碳排放”并补偿“碳排放”持观望态度;公众不愿意参与低碳旅游的原因多元化,多数人认为低碳旅游只是一个口号,降低了旅游过程的舒适性.(3)大部分公众能采取出行前制定周详的计划、主动关闭电视机和选择有机食品等低碳行为,但只有少数人自愿减少更换被单次数、接受循环使用的旅游包(帽)和自带个人卫生用品入住酒店等.基于上述状况,文中提出相应的建议以促进低碳旅游的推广与实践.  相似文献   

大直径桩承载特性的研究进展评述     

应亦凡  熊良宵 《地质灾害与环境保护》2014,(2):104-112

从大直径桩的荷载传递特性、在竖向荷载作用下承载特性的试验和理论、在水平向荷载作用下承载特性的试验和理论方面评述大直径桩承载特性的研究进展。同时指出各种研究中存在的问题,以及各种研究方法的优点和不足。  相似文献   

基于时空行为视角的犯罪地理创新研究框架     

柳林  吴林琳  宋广文  周素红  关美宝 《地理研究》2022,41(6):1748-1764

犯罪地理研究与时空行为领域的研究有着共同的理论基础,二者都强调时空间环境与人类行为的相互作用。犯罪行为是人类特殊行为的一种,相关实证前沿已开始重视不同犯罪相关主体（犯罪者、潜在受害者、警察等）时空行为规律的挖掘、日常活动的动态衡量及不同主体行为的交互等方面对犯罪发生的影响;时空行为研究中的活动空间、环境暴露、群体分异、活动交互等维度的成果可拓展至犯罪地理研究。近年来,两大领域的前沿成果不断涌现,但目前仍缺乏从时空行为视角对犯罪地理学研究进行系统梳理,并对两者的融合创新进行深入探讨。为此,本研究在梳理犯罪地理中时空行为的理论基础和评述犯罪者、潜在受害者、警察时空活动对犯罪时空格局的影响研究基础上,基于犯罪地理和时空行为领域的交叉维度构建犯罪时空行为创新研究的框架,尝试推进该交叉领域在理论、方法与应用等方面的发展。  相似文献