琼东南盆地深水区构造热演化特征及其影响因素分析

To reveal the tectonic thermal evolution and influence factors on the present heat flow distribution, based on 154 heat flow data, the present heat flow distribution features of the main tectonic units are first analyzed in detail, then the tectonic thermal evolution histories of 20 profiles are reestablished crossing the main deep-water sags with a structural, thermal and sedimentary coupled numerical model. On the basis of the present geothermal features, the Qiongdongnan Basin could be divided into three regions: the northern shelf and upper slope region with a heat flow of 50–70 m W/m2, most of the central depression zone of 70–85 m W/m2, and a NE trending high heat flow zone of 85–105 m W/m2 lying in the eastern basin. Numerical modeling shows that during the syn-rift phase, the heat flow increases generally with time, and is higher in basement high area than in its adjacent sags. At the end of the syn-rift phase, the heat flow in the deepwater sags was in a range of 60–85 m W/m2, while in the basement high area, it was in a range of 75–100 m W/m2. During the post-rift phase, the heat flow decreased gradually, and tended to be more uniform in the basement highs and sags. However, an extensive magmatism, which equivalently happened at around 5 Ma, has greatly increased the heat flow values, and the relict heat still contributes about 10–25 m W/m2 to the present surface heat flow in the central depression zone and the southern uplift zone. Further analyses suggested that the present high heat flow in the deep-water Qiongdongnan Basin is a combined result of the thermal anomaly in the upper mantle, highly thinning of the lithosphere, and the recent extensive magmatism. Other secondary factors might have affected the heat flow distribution features in some local regions. These factors include basement and seafloor topography, sediment heat generation, thermal blanketing, local magmatic injecting and hydrothermal activities related to faulting and overpressure.     

简评2004年全国高考上海地理试卷

“2004年全国普通高等学校统一考试上海地理试卷”受到了地理教师和考生的普遍好评，社会反响也很不错。这份考卷特点鲜明，的确有不少值得肯定之处。     

基于WebGIS的文化遗产及景区旅游信息系统的设计与实现

本系统通过综合应用WebGIS、三维虚拟现实、数据库等技术,对中华文化遗产和旅游信息资源进行整合和集成,构建了数字化中华文化遗产区域地理信息地图,并对部分文化遗产及景区的进行了三维虚拟数字化展示,为提升中华文化遗产数字化程度和文化旅游综合服务水平开辟了新途径,为探索具有产业化和示范性运作前景的文化旅游综合服务模式提供了借鉴。     

基于深度学习的像素级全色图像锐化研究综述EI北大核心CSCD

全色图像锐化是遥感数据处理领域的一个基础性问题,在地物分类、目标识别等方面具有重要的研究意义和应用价值。近年来,深度学习在自然语言处理、计算机视觉等领域取得了巨大进展,也推动了像素级全色图像锐化技术的发展。本文提出从经典方式和协同方式两个方面对深度学习在全色图像锐化中的研究进行系统的综述,并在此基础上进行前景展望。首先,给出全色图像锐化常用的数据集和全色图像锐化的质量评价指标;接着,从经典方式与协同方式两个方面对基于深度学习的全色图像锐化最新研究成果进行分门别类的介绍,并进行算法性能的对比、分析和归纳;然后,对全色图像锐化的3个主要应用领域如地物分类、目标识别和地表变化检测进行分析;最后,本文探讨了基于深度学习的全色图像锐化的5个未来研究方向。     

简讯七则

(1)《东部沿海地区环境水文地质学术讨论会》于1987年5月在大连召开。参加会议共有30多个单位的51名代表,提交论文36篇。这次会议是建国以来首次专门讨论沿海地区的环境水文地质问题的一次学术性会议。与会代表认为,当前除继续进行污染调查和监测外,应对地下水的污染机理及防治措施进行研究,从根本上防治地下水污染。继续开展地     

电子自旋共振法年龄测定研究

电子自旋共振(ESR)法适用于第四纪样品的年龄测定.本文报道近2年来作者等对鹿角、丽蚌、石筍、黄土、珊瑚和贝壳样品的年龄测定,其结果与地层、TL和¹⁴C年龄相符.预示ESR法将会成为第四纪年代学研究的有力工具.     

平台巴西劈裂试验确定岩石抗拉强度的理论分析

为了完善平台巴西劈裂试验测定岩石抗拉强度的理论基础,基于二维弹性理论,建立对弦载荷下的平台巴西劈裂力学模型,采用应力场叠加法求得圆盘内的应力近似解析解。该应力理论解与有限元数值解一致,证明理论求解的合理性。在此基础上,对比研究了平台加载角对圆盘内应力大小及应力集中程度的影响,其结果表明：平台加载角越大,圆盘加载处的应力集中程度和压拉应力比都急剧降低,而圆盘内的拉应力值和拉伸区却只有一定程度减小;过大或过小的平台加载角都不利于平台巴西试样发生中心拉伸劈裂破坏,其最优平台加载角在20°~30°之间。最后,依据Griffith强度破坏准则,推得岩石抗拉强度的理论计算公式,其结果与已有抗拉强度经验公式及试验所得抗拉强度相符较好。     

岩溶水文水井钻探中地面塌陷的防治

岩溶水文水井钻探中地面塌陷的防治贵州煤田地质局水源队黄福龙岩溶地面塌陷已成为一大地质灾害。多年来，我队在贵州西部裸露型岩溶地层的水文水井钻探过程中，井口附近多次塌陷，危及正常生产。本文主要对钻探过程中塌陷的原因和防治谈一些浅见。１塌陷原因区内主要取水...     

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