4种多环芳烃对仿刺参耗氧率和排氨率的影响研究

为探究多环芳烃(PAHs)对海洋生物的生态毒理效应,作者将仿刺参(Apostichopus japonicus)分别暴露于质量浓度为10、20、50、100、150μg/L的菲、三甲基菲、蒽和二甲基蒽中,检测4种代表性多环芳烃胁迫下仿刺参的耗氧率和排氨率.结果显示:在不同质量浓度多环芳烃的胁迫下,仿刺参的耗氧率均显著高...     

青海多彩当江地区水系沉积物元素地球化学结构特征及找矿方向

青海多彩当江地区位于三江多金属成矿带,具有较好的找矿前景。以该区1∶5万水系沉积物地球化学测量数据为研究对象,结合研究区内的米扎纳能铜-铅-锌多金属矿床的水系沉积物地球化学结构特征与地质特征进行了剖析,总结了研究区的地质-地球化学找矿标志,并提出了龙格东多铜-锌多金属找矿远景区,为该区的找矿工作提供了新方向。     

伶仃洋茅洲河口动力地貌演变过程

利用长系列的水文泥沙、水下地形和遥感影像等数据,通过数字地形高程模型和水动力数学模型等方法,探讨了伶仃洋茅洲河口的动力地貌演变过程及主要原因。结果表明:伶仃洋中滩海区近年冲刷态势明显,拦江沙与矾石浅滩呈现逐渐分离并有发育形成"新中槽"的演变趋势;茅洲河口门深槽的形成发育以落潮流动力作用为主,交椅湾深槽具有涨潮沟的性质,交椅沙形成发育对于稳定周边海区滩槽格局具有重要作用;大规模围涂造地和海床采砂等人类开发活动显著改变了伶仃洋的地形边界条件,进而影响河口水沙输移和滩槽格局,亟需加强监控。     

LIMITATION OF CURRENT TECTONIC DEFORMATION MODES IN THE WESTERN MARGIN OF ORDOS BASED ON SEISMIC ACTIVITY CHARACTERISTICS

Due to the interaction between the Tibetan plateau, the Alxa block and the Ordos block, the western margin of Ordos(33.5°~39°N, 104°~108°E)has complex tectonic features and deformation patterns with strong tectonic activities and active faults. Active faults with different strikes and characteristics have been developed, including the Haiyuan Fault, the Xiangshan-Tianjingshan Fault, the Liupanshan Fault, the Yunwushan Fault, the Yantongshan Fault, the eastern Luoshan Fault, the Sanguankou-Niushoushan Fault, the Yellow River Fault, the west Qinling Fault, and the Xiaoguanshan Fault. In this study, 7 845 earthquakes(M≥1.0)from January 1st, 1990 to June 30th, 2018 were relocated using the double-difference location algorithm, and finally, we got valid locations for 4 417 earthquakes. Meanwhile, we determined focal mechanism solutions for 54 earthquakes(M≥3.5)from February 28th, 2009 to September 2nd, 2017 by the Cut and Paste(CAP)method and collected 15 focal mechanism solutions from previous studies. The spatial distribution law of the earthquake, the main active fault geometry and the regional tectonic stress field characteristics are studied comprehensively. We found that the earthquakes are more spatially concentrated after the relocation, and the epicenters of larger earthquakes(M≥3.5) are located at the edge of main active faults. The average hypocenter depth is about 8km and the seismogenic layer ranges from 0 to 20km. The spatial distributions and geometry structures of the faults and the regional deformation feature are clearly mapped with the relocated earthquakes and vertical profiles. The complex focal mechanism solutions indicate that the arc-shaped tectonic belt consisting of Haiyuan Fault, Xiangshan-Tianjingshan Fault and Yantongshan Fault is dominated by compression and torsion; the Yellow River Fault is mainly by stretching; the west Qinling Fault is characterized by shear and compression. The structural properties of the fault structure are dominated by strike-slip and thrust, with a larger strike-slip component. The near-north-south Yellow River Fault is characterized by high angle NW dipping and normal fault motion. Based on small earthquake relocation and focal mechanism solution results, and in combination with published active structures and geophysical data in the study area, it is confirmed that the western margin of Ordos is affected by the three blocks of the Tibetan plateau, the Alax and the Ordos, presenting different tectonic deformation modes, and there are also obvious differences in motion among the secondary blocks between the active faults. The area south of the Xiangshan-Tianjingshan Fault has moved southeastward since the early Quaternary; the Yinchuan Basin and the block in the eastern margin of the Yellow River Fault move toward the SE direction.     

立交桥三维建模的集成方法研究

基于大比例尺航空立体像对提出三维立交桥建模方法，依据航空影像三维重建原理，从航空影像中采集出较为精确的三维立交桥轮廓线，结合立交桥设计方法，创建了基于CAD的重现点、线、多边形、体的立交桥模型，在此基础上形成了由CAD、GIS、三维影像数据集成的一种立交桥三维建模的处理方法，并提出了立交桥三维重建的层次细节模型，最后对本文方法进行了实验并获得了较好的实验结果。     

GPS RTK技术在地籍测量中的应用

介绍了GPS测量技术中的载波相位实时动态测量(RTK)技术的基本原理、精度以及操作过程中的关键问题，探讨了RTK技术在地籍测绘中的应用，分析了地籍测量中的精度，得出了一些有益的结论。     

钻探机具的有限元分析

钻探机具由于其恶劣的工作环境和复杂的受力情况，应用有限元分析方法可实现它的数值模拟，且具有明显的优越性。运用ANSYS有限元软件对GQ－160型风动冲击器活塞的应力应变进行了分析，得出活塞的变形不影响工作，应力集中部位与实际情况相符合的分析结果，说明应用有限元法对钻探机具进行分析是准确可靠的。     

基于区域分割和编码的相位解缠方法

分析了相位解缠的原理及干涉条纹数据的特点，提出了一种基于中值自适应滤波，区域分割和编码的解缠方法。实验证明了该方法的可行性。     

探地雷达探测地下管线的研究

在大量的城市地下施工过程中,地下管线的保护越来越受到重视,掌握施工区地下管线的敷设又是确保地下管线安全的前提。本文结合工程实例介绍了探地雷达的基本原理以及资料处理方法,并分析了探地雷达在探测管线分布中的应用效果。     

路堤荷载下CFG桩复合地基沉降分析

分析了路堤荷载下CFG桩复合地基的变形机理，根据假定的沉降模式及桩侧摩阻力分布形式，推导出了考虑桩-土-褥垫层共同作用的简化沉降计算公式，结果与试验数据吻合较好。