A study on seawater apparent heavy metalcomplexation capacity in the Haikou Bay     

Chen Chunhua 《海洋学报(英文版)》1998,17(3):327-336

ＡｓｔｕｄｙｏｎｓｅａｗａｔｅｒａｐｐａｒｅｎｔｈｅａｖｙｍｅｔａｌｃｏｍｐｌｅｘａｔｉｏｎｃａｐａｃｉｔｙｉｎｔｈｅＨａｉｋｏｕＢａｙＣｈｅｎＣｈｕｎｈｕａ（ＲｅｃｅｉｖｅｄＯｃｔｏｂｅｒ１０,１９９６;ａｃｃｅｐｔｅｄＡｐｒｉｌ４．１９９７）Ａｂ...  相似文献   

Studies on seawater self-purification capacity to heavy metals in the Haikou Bay     

Chen Chunhua 《海洋学报(英文版)》1998,17(2):197-207

Ｓｔｕｄｉｅｓｏｎｓｅａｗａｔｅｒｓｅｌｆ－ｐｕｒｉｆｉｃａｔｉｏｎｃａｐａｃｉｔｙｔｏｈｅａｖｙｍｅｔａｌｓｉｎｔｈｅＨａｉｋｏｕＢａｙＣｈｅｎＣｈｕｎｈｕａ（ＲｅｃｅｉｖｅｄＯｃｔｏｂｅｒ１０,１９９６;ａｃｃｅｐｔｅｄＦｅｂｒｕａｒｙ３,１９９...  相似文献   

三峡水库不同间距高程消落带草本植物群落物种多样性与结构特征   总被引：4，自引：1，他引：3  

雷波  王业春  由永飞  张晟  杨春华 《湖泊科学》2014,26(4):600-606

植物群落结构特征与其生境具有重要关系.三峡水库消落带独特的水文状况和不同地区地理条件的差异导致其不同区域不同水位高程的植被群落结构差异.为研究三峡水库消落带典型区域植被群落结构特征,调查分析了位于三峡水库腹地的消落带上、中、下部3个不同间距高程(145~155、155~170、170~175 m)的草本植物群落物种组成、生物多样性和结构特征.结果表明:共发现49种草本植物,上、中、下部分3个高程物种数分别为4、18、45种,随高程的增加物种数呈较为显著的增加;3个高程草本植物平均盖度、平均密度和平均高度范围分别为(2.58%±1.29%)74.83%±2.57%、(43.58±85.93)466.08±48.04株/m²和(4.89±0.56)77.02±9.31cm.综合分析表明,三峡水库腹地小范围流域消落带草本植物物种组成和结构趋于简单化,由于受水淹胁迫影响及不同高程微生境的差异,不同高程消落带植物多样性有所差异,呈现出的群落特征也有所不同,因此应充分考虑不同水位高程物种组成和结构的差异性特征,分类(区)配置物种搭配、优化种间关系可促进消落带草本植物多样性以及群落结构的改善.  相似文献   

利用福建台网与全球其他台网计算台湾地震震源机制的对比研究          下载免费PDF全文

陈惠芳  段刚  于培青  林彬华  金春华 《地震工程学报》2019,41(4):991-998

福建台网采用16个台湾台站记录的地震波形数据,选用适合台湾地区的地壳模型,通过CAP方法计算2018年2月台湾花莲海域4次6级以上地震的震源机制解。为验证计算结果的有效性和可靠性,将该计算结果分别与台湾中央气象局、美国地质调查局、Global CMT的结果进行对比研究,对比结果表明福建台网反演的震源机制解与全球其他台网的计算结果基本一致。通过本研究,进一步明确台湾区域构造动力学环境,也为福建台网日常化产出台湾地区地震震源机制解打下基础,还更加丰富福建台网对台湾地震的产品产出。  相似文献   

多维地震作用下钢筋混凝土建筑结构的抗连续倒塌仿真分析          下载免费PDF全文

丛苏莉 《地震工程学报》2018,40(1):41-47

为了提高钢筋混凝土建筑结构的抗震性能,分析多维地震作用下钢筋混凝土建筑结构的抗连续倒塌能力,结合钢筋混凝土建筑结构特性、节点构造特点以及其在多维地震作用下的破坏机理,采用离散单元法建立结构连续倒塌的理论模型,对建筑结构连续倒塌过程进行数值模拟。基于数值模拟化结果,通过备用荷载路径法,实现建筑结构的抗连续倒塌分析。仿真实验结果得出,所提方法能实现对建筑结构抗连续倒塌的准确分析,且在多维地震作用下建筑结构扭转的幅度明显变大,结构顶层位移发散状态显著,不同楼层会产生不同的层间位移以及薄弱部位,建筑结构的抗连续倒塌性能随着失效构件位置的提升而增强。  相似文献   

中巴O2B影像质量评价与几何校正初探     

洪志刚  丛楠  唐新明  李参海 《测绘与空间地理信息》2010,33(4)

中巴O2B数据是目前我国自主生产的地面分辨率最高的光学卫星影像,面对我国卫星数据仍以国外数据为主的局面,国家积极鼓励使用国产的O2B数据.本文以O2B和SPOT 5数据对比进行影像质量评价,通过不同控制点进行几何校正试验,试验结果表明数据校正效果尚佳,能够满足国家1:50 000地形图测绘要求,具有广泛的应用前景.  相似文献   

Numerical Simulation of the Influence of Pore Structure on Resistivity,Formation Factor and Cementation Index in Tight Sandstone     

WU Feng  WEN Zhu  YAO Cong  WANG Xianhu  XI Yanping  CONG Linlin 《《地质学报》英文版》2020,94(2):290-304

Tight sandstone,with severe diagenesis and complex pore structure,differs greatly from conventional sandstone in terms of rock electrical parameters.In subsurface rock electrical experiments,various electrical parameters are confounded and can only be analyzed qualitatively.The lack of quantitative analysis for each individual electrical parameter presents a challenge for the evaluation of oil and gas saturation in tight sandstone.Based on the 2D pore-throat model and the features of pore structure in the tight sandstone of the Penglaizhen and Shaximiao Formations in the upper and middle Jurassic of the Western Sichuan Depression,this paper presents 3D micro pore-throat models for three types of tight sandstone.It proposes a finite element-based rock electrical simulation method to analyze the influence of pore structure parameters,such as throat radius and throat tortuosity,on electrical parameters such as resistivity,formation factor,and cementation index quantitatively.The research revealed the following results:(1)Throats of tight sandstone usually have lamellar or curved lamellar shapes that are slender and narrow.The lamellar throat used in the proposed porethroat model is more consistent with the features of tight sandstone than the tubular throat used in the original model.(2)The throat determines the conductivity of tight sandstone.The throat parallel to the electric potential has the greatest influence on conductivity,and the throat perpendicular to the potential has the least influence.(3)In tight sandstone grades I to III,as the porosity decreases,the formation factor increases and the cementation index decreases.(4)The results of the rock electrical simulation are consistent with the results of the rock electrical experiment,which indicates that the proposed rock electrical simulation method of tight sandstone is effective and accurate.  相似文献   

Formation of Thorne–Żytkow objects in close binaries     

Bumareyamu Hutilukejiang  Chunhua Zhu  Zhaojun Wang  Guoliang Lü 《Journal of Astrophysics and Astronomy》2018,39(2):21

Thorne–?ytkow objects (T?Os), originally proposed by Thorne and ?ytkow, may form as a result of unstable mass transfer in a massive X-ray binary after a neutron star (NS) is engulfed in the envelope of its companion star. Using a rapid binary evolution program and the Monte Carlo method, we simulated the formation of T?Os in close binary stars. The Galactic birth rate of T?Os is about \(1.5\times 10^{-4}~\hbox {yr}^{-1}\). Their progenitors may be composed of a NS and a main-sequence star, a star in the Hertzsprung gap or a core-helium burning, or a naked helium star. The birth rates of T?Os via the above different progenitors are \(1.7\times 10^{-5}\), \(1.2\times 10^{-4}\), \(0.7\times 10^{-5}\), \(0.6\times 10^{-5}~\hbox {yr}^{-1}\), respectively. These progenitors may be massive X-ray binaries. We found that the observational properties of three massive X-ray binaries (SMC X-1, Cen X-3 and LMC X-4) in which the companions of NSs may fill their Roche robes were consistent with those of their progenitors.  相似文献   

Water Footprint Assessment for Coal-to-Gas in China     

Wang  Jianliang  Liu  Xiaojie  Geng  Xu  Bentley  Yongmei  Zhang  Chunhua  Yang  Yuru 《Natural Resources Research》2019,28(4):1447-1459

Natural Resources Research - To increase its domestic gas production and achieve cleaner end-use utilization of its coal resources, China is actively promoting its coal-to-gas (CTG) industry....  相似文献   

基于用户历史瓦片浏览记录的兴趣点智能搜索方法优化研究     

丛杨  孙伟  李成名  路文娟 《地理信息世界》2019,26(2):92-95

在网上各种信息呈现爆炸式增长的背景下,传统方法往往难以顾及用户兴趣,而导致查询无法体现个性化。针对这一问题提出一种基于用户历史瓦片浏览记录的兴趣点智能搜索方法。首先对智慧城市平台下的用户历史瓦片浏览记录数据进行分析,并以热力图可视化形式展现出用户关注的热点区域,得出空间热度;然后根据属性查询中加入空间热度影响因子来影响兴趣点搜索结果,使搜索结果更加符合用户搜索意图,针对热点区域给不同用户以相应服务;以滕州市兴趣点为实验数据,使用Elasticsearch构建索引数据库,采用Web前端技术搭建搜索框架,经过实验对比分析发现,该方法能够有效地提高搜索的查准率,并且可随着数据量的丰富变得更加智能化。  相似文献