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洪顺英  单新建  刘智荣  申旭辉  戴娅琼  荆凤 《大地测量与地球动力学》2013,33(1):6-12

????OKADA??????????????????????????????????????????????α???????????????????????α??????????????????????????,??????????,???????α?????-109.7 cm??????????????????α????19.2 cm??????????????????????????????????????α?????-51.4 cm????????????,????α?????98.5 cm???????????????????????????????????????α?????-66.5 cm?????????????????????α????25.8 cm????????????α?????????????????????????????????????α????????????????????????????????????????????  相似文献   

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戴小蕾  楼益栋  李文 《大地测量与地球动力学》2013,33(1):53-58

??????GPS?????е??????????????????????????????????????????????????????????????й?????????????????????????????????????￡?18??????????????16?????????????????????2С??????????????18??????????16??????????????GPS ?????????2????????16????4С????????????????14cm,????18????3С????????????????1cm??  相似文献   

Identification of sorption processes and parameters for radionuclide transport in fractured rock     

Zhenxue Dai  Andrew Wolfsberg  Paul Reimus  Hailin Deng  Edward Kwicklis  Mei Ding  Doug Ware  Ming Ye 《Journal of Hydrology》2012

  相似文献   

Water quality, nutrient budget, and pollutant loads in Chinese mitten crab (Eriocheir sinensis) farms around East Taihu Lake   总被引：2，自引：0，他引：2  

�̴���  ��Т��  �ƺ���  ����Ӯ  ҶԪ��  ʩ�½� 《中国海洋湖沼学报》2012,30(1):29-36

To understand the factors causing frequent outbreaks of harmful algae blooms in the Taihu Lake, China, we studied water quality and nutrient budget in Chinese mitten crab (Eriocheir sinensis) farm ponds in the eastern part of the lake from November 2007 to December 2009. We estimated the nitrogen (N), phosphorus (P), and chemical oxygen demand (COD) loads. Materials input and output ponds, water exchange, and applied management practices of 838.5-hm2 crab ponds were surveyed using questionnaires. Water quality of 12 ponds, which were located no more than 2 km from East Taihu Lake, were monitored. The results show that water quality in the crab ponds was better than reference data. Feeds, including corn seed, commercial feed, trash fish, and gastropod, were the major sources of N and P input in the crab ponds, contributing 88.7% and 94.9%, respectively. In total, 60.5% of N and 37.3% of P were sequestered by macrophytes, and only 15.7% and 8.5% of them were discharged as effluent. The net loads of N and P in effluent were 16.43 kg/hm2/cycle and 2.16 kg/hm2/cycle, respectively, while the COD load was -17.88 kg/hm2/cycle. This indicated that crab farming caused minor negative impact on the trophic status of the lake area, which was attenuated by macrophytes. However, wastewater purification is still necessary in crab faming.  相似文献   

基于ICE中间件的通用测震数据库网关应用研究   总被引：1，自引：1，他引：0  

刘坚  高景春  戴苗  缪发军  陈智勇 《地震地磁观测与研究》2012,33(2):145-151

提出基于ICE测震数据库通用网关的构建方法,利用ICE可扩展性、可重用性、支持多种编程语言和分布式部署的特点,结合分布式中间件技术,定义开发一系列读写操作测震数据库通用接口,为测震数据应用提供多元化服务,实现业务逻辑与数据库访问相分离,同时增强测震业务系统的可扩展性与安全性.该数据库网关在全国测震实际相关业务系统中取得较好的应用效果.  相似文献   

县域特色产业形成和演化机理研究进展   总被引：1，自引：0，他引：1  

王岱  蔺雪芹  司月芳  余建辉 《地理科学进展》2013,32(7):1113-1122

培育壮大县域特色产业是中国统筹区域城乡发展的战略重点之一, 研究县域特色产业也是区域可持续发展研究的重要内容。本文从理论视角、热点领域、研究方法3 个方面对近年来县域特色产业研究的重点进行了梳理。县域特色产业作为区域优势和产业特点的结合产物, 相关研究的理论视角基本属于人地关系地域系统的基础理论体系, 同时借鉴了生态学、系统学理论观点和分析框架, 为清晰刻画产业内外影响因子的共栖关系和互动效应提供了有效途径。从研究领域上看, 关注点从地方经济发展到全球生产网络、从传统影响因素到新因素, 与时俱进, 但是宏观研究和微观研究相互脱节现象突出, 在一定程度上影响了研究成果的实践指导意义。从研究方法上看, 相关研究正在从以定性描述和逻辑推理为主, 向定性和定量相结合的综合集成方法应用转变, 但受到数据可获取性的限制, 现象和变化趋势的驱动机制分析的技术方法亟待完善。  相似文献   

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陈俊华  姚运生  吴海波  吴建超  申学林  魏贵春  戴苗  赵凌云 《大地测量与地球动力学》2013,33(2):31-34

??2012??10??31??????????????M_L3.8С????????о?????????????????????????????????????????????????????????????????????10 km??????????????????????????????С??????????5 km???Χ???????????????????????????????????????????????λ?????????????????????????????????????????????????  相似文献   

Seismic damage to structures in the <Emphasis Type="Italic">M</Emphasis><Subscript>s</Subscript>6.5 Ludian earthquake     

Hao Chen  Quancai Xie  Boyang Dai  Haoyu Zhang  Hongfu Chen 《地震工程与工程振动(英文版)》2016,15(1):173-186

On 3 August 2014, the Ludian earthquake struck northwest Yunnan Province with a surface wave magnitude of 6.5. This moderate earthquake unexpectedly caused high fatalities and great economic loss. Four strong motion stations were located in the areas with intensity V, VI, VII and IX, near the epicentre. The characteristics of the ground motion are discussed herein, including 1) ground motion was strong at a period of less than 1.4 s, which covered the natural vibration period of a large number of structures; and 2) the release energy was concentrated geographically. Based on materials collected during emergency building inspections, the damage patterns of adobe, masonry, timber frame and reinforced concrete (RC) frame structures in areas with different intensities are summarised. Earthquake damage matrices of local buildings are also given for fragility evaluation and earthquake damage prediction. It is found that the collapse ratios of RC frame and confined masonry structures based on the new design code are significantly lower than non-seismic buildings. However, the RC frame structures still failed to achieve the ‘strong column, weak beam’ design target. Traditional timber frame structures with a light infill wall showed good aseismic performance.  相似文献   

Numerical simulation on the seismic absorption effect of the cushion in rigid-pile composite foundation     

Xiaolei Han  Yaokun Li  Jing Ji  Junhao Ying  Weichen Li  Baicheng Dai 《地震工程与工程振动(英文版)》2016,15(2):369-378

In order to quantitatively study the seismic absorption effect of the cushion on a superstructure, a numerical simulation and parametric study are carried out on the overall FEA model of a rigid-pile composite foundation in ABAQUS. A simulation of a shaking table test on a rigid mass block is first completed with ABAQUS and EERA, and the effectiveness of the Drucker-Prager constitutive model and the finite-infinite element coupling method is proved. Dynamic time-history analysis of the overall model under frequent and rare earthquakes is carried out using seismic waves from the El Centro, Kobe, and Bonds earthquakes. The different responses of rigid-pile composite foundations and pile-raft foundations are discussed. Furthermore, the influence of thickness and modulus of cushion, and ground acceleration on the seismic absorption effect of the cushion are analyzed. The results show that: 1) the seismic absorption effect of a cushion is good under rare earthquakes, with an absorption ratio of about 0.85; and 2) the seismic absorption effect is strongly affected by cushion thickness and ground acceleration.  相似文献   

基于粒度控制的复杂储层渗透性建模方法     

赵军  代新雲  古莉  祁新忠  陈伟中 《吉林大学学报(地球科学版)》2016,46(1):279-285

岩石颗粒大小反映了沉积岩结构的主要特征,是岩石岩性的主要评价指标,同时也是影响沉积物渗透性的主要因素。沉积环境在纵向上表现出来的差异性,使得粒序控制下的地层渗透性在纵向上也表现出非均质性。为了精细地描述由于粒度大小造成的渗透率的非均质性,本文首先结合岩心粒度分析资料,分析了研究区粒度大小对物性影响的规律,利用自然伽马、中子、密度、声波曲线,通过测井地质分析提取敏感参数,建立了粒度计算模型;然后以粒度为指标,建立了不同粒度大小条件下的渗透率计算模型。通过现场资料的处理及其与岩心资料的对比,认为这种渗透率建模方法能够较好地反映沉积物粒度对岩石渗透性的控制作用,能够更加精确地描述复杂岩性地层渗透率的非均质性特征,从而可为地质开发研究提供更为准确的渗透率剖面。  相似文献