智慧公安动态警务分析与研判系统设计与实现     

何丹丹  赵雨慧  覃杨飞  呙维  朱欣焰 《测绘与空间地理信息》2019,42(7)

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1998~2017年国际北极地区海洋科学研究文献计量与发展态势     

於维樱  王琳  冯志纲  张灿影 《海洋科学》2018,42(10):64-81

北极拥有其独特的地理位置和战略价值,同时也是全球变暖最关键的敏感区,世界各国针对北极地区制定了一系列政策计划,并开展了多年的北极海洋科学研究。基于Web of Science数据库收录的1998~2017年SCIE文章,采用文献计量与引文分析的方法与工具,分析了13784篇北极海洋科学研究的整体态势与热点前沿,结果表明：①全球北极海洋科学研究呈现出加快增长趋势,近5年的发文已经翻了一番,年均发文在689篇以上; ②环北极八国是该领域研究的主要力量,美国遥遥领先其他国家,挪威、丹麦研究基底深厚但近年发展稍缓,英国、德国是主要的非北极研究国,瑞典、法国的论文质量均衡,中国、波兰、格陵兰和荷兰则是该领域的后起之秀; ③俄罗斯科学院在本领域发文最多但文章质量良莠不齐,德国极地与海洋研究所、丹麦&格陵兰地质调查机构与挪威海洋研究所的第一作者与通讯作者研究占比高,哥本哈根大学、德国极地与海洋研究所、华盛顿大学在该领域科研影响力较大; ④全球海洋科学研究主要涉及地质学、海洋学、环境生态学、自然地理学、地球化学与地球物理学以及气象学与大气科学等领域,研究热点包括北极气候变化与极端天气、冰川消融与海平面上升、北极生态系统特征结构、北极海洋酸化与污染防治等方面。随着“一带一路”、“冰上丝绸之路”和《中国的北极政策》白皮书的发布,建议我国针对本国情况制定综合性北极科研计划,并注重科研机构间跨部门、跨领域的研究合作,加强与环北极国家和“一带一路”国家的合作,加大科研投入并开展国际规模的科学考察活动。  相似文献   

从对地观测到对人观测——浅析社会地理计算     

李德仁  呙维  常晓猛  李熙 《地理学报(英文版)》2020,30(2):233-250

It is possible to obtain vast amounts of spatiotemporal data related to human activities to support the study of human behavior and social evolution.In this context,geography,with the human-nature relationship as its core,is undergoing a transition from strictly earth observations to the observation of human activities.Geocomputation for social science is one manifestation thereof.Geocomputation for social science is an interdisciplinary approach combining remote sensing techniques,social science,and big data computation.Driven by the availability of spatially and temporally expansive big data,geocomputation for social science uses spatiotemporal statistical analyses to detect and analyze the interactions between human behavior,the natural environment,and social activities;Remote sensing(RS)observations are used as primary data.Geocomputation for social science can be used to investigate major social issues and to assess the impact of major natural and societal events,and will surely be an area of focused development in geography in the near future.We briefly review the background of geocomputation in the social sciences,discuss its definition and disciplinary characteristics,and highlight the main research foci.Several key technologies and applications are also illustrated with relevant case studies of the Syrian Civil War,typhoon transits,and traffic patterns.  相似文献   

Regulation of water quality and growth characteristics of indoor raceway culture of <Emphasis Type="Italic">Litopenaeus vannamei</Emphasis>   总被引：1，自引：0，他引：1  

藏维玲  杨明  戴习林  侯文杰  刘永士  丁福江 《中国海洋湖沼学报》2009,27(4):740-747

Two modes of regulating the water quality of experimental ponds in indoor raceway culture of Litopenaeus vannamei were evaluated using simple water treatment facilities. A self-made water purifying net, aeration stone, composite microbe preparation, and Ceratophyllum demersum were placed in the experimental ponds and the culture water was circulated along the raceway inside the pond using a paddle wheel aerator. In addition, the water quality in the experimental pond was improved by draining effluent from the pipeline at the bottom of ponds 7 and 8 (mode I) and exchanging the circulating water in pond 10 (mode II) with the reservoir water in pond 9 using a pump and pipeline. The water quality in the experimental ponds was similar in response to regulation using mode I or mode II. Water quality parameters in the experimental ponds were controlled within a suitable range by simple facilities during culture period without using any chemical treatments. The rich content of dissolved oxygen was maintained by the circular flow and continuous aeration of the pond water. The respective average values of the main water parameters in experimental ponds 7 and 10 in response to regulation of the water quality using modes I and II were as follows: pH 8.17 and 7.99; DO 5.16 mg/L and 5.97 mg/L; COD_Mn 18.45 and 12.61 mg/L; TAN (NH₃-N) 0.854 mg/L (0.087 mg/L) and 0.427 mg/L (0.012 mg/L); NO₂-N 0.489 mg/L and 0.337 mg/L. Moreover, the average body length and body weight of harvested shrimp of pond 7 and pond 10 were 7.56 cm and 8.99 cm, 5.10 g and 8.33 g, respectively. Furthermore, the survival rate, average biomass yield and average condition factor of the shrimp harvested were 70% and 60%, 2.54 kg/m² and 2.14 kg/m², and 0.675 g/cm and 0.927 g/cm, respectively. Linear equations describing the relationship between body length and culture time and cubic or power functions describing the relationship between body weight and body length were obtained based on evaluation of the growth data of shrimps throughout the culture period.  相似文献   

热带太平洋海域感热,潜热通量的时空特征   总被引：4，自引：0，他引：4  

李若钝  曲维政 《海洋通报》1993,12(4):45-48

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渤海湾盆地石炭二叠系烃源岩的沉积控制   总被引：2，自引：0，他引：2  

刘长江蒋维平  桑树勋林会喜陈世悦  朱炎铭黄华州 《中国煤田地质》2007,19(1):4-8

运用地球化学等分析测试手段，研究了渤海湾盆地石炭二叠系烃源岩的展布及其沉积控制、有机质特征、有机相及生烃潜力，认为：苏桥一文安地区、黄骅坳陷的南皮凹陷和沧东凹陷等地区为沉积中心；泻湖、潮坪和泛滥平原较好的控制了烃源岩的发育；对研究区山西组和太原组划分出了5种沉积有机相，其中以深沼芦苇沉积有机相和流水沉积有机相形成的烃源岩最好，主要以生油和生气为主。  相似文献   

宁夏南部地表辐射和热量平衡的遥感研究          下载免费PDF全文

郭建茂陆维松  闵文彬刘文泉 王连喜 《应用气象学报》2007,18(5):702-708

为了研究和揭示宁夏南部地气能量传输过程及特点并进一步评估退耕还林还草的生态效应, 利用Landsat-7 ETM+卫星遥感资料所求取的地表特征参数, 将地表分成水体、裸地、半裸地、草地、林地5类地表覆盖类型, 结合常规气象观测资料, 分别计算得出宁夏南部地表辐射和热量平衡各量的区域分布, 并给出各量的分布图和直方图, 分类别讨论了地表辐射和热量平衡各量分布特征, 使得对宁夏南部区域地表辐射和热量平衡区域分布有一个直观、综合的了解和认识。研究表明, 植被分布对地表辐射和热量平衡各量影响很大。  相似文献   

元宝山露天矿疏干优化设计     

董书宁  李日润  虎维岳 《煤田地质与勘探》2000,28(5):38-41

从影响元宝山露天矿地下水疏干的主要水文地质参数随机性特征分析入手,建立并求解了元宝山露天矿疏干工程优化设计的随机地下水管理模型,揭示了水文地质参数随机性对管理模型结果的影响,认为参数的随机性越大,管理结果越坏;置信水平越高,管理结果越坏,且渗透系数和边界条件对管理结果影响最大。   相似文献   

一种VGI矢量数据增量变化发现的多层次蔓延匹配算法     

田文文  朱欣焰  呙维 《武汉大学学报(信息科学版)》2014,(8)

矢量要素的匹配是发现地物要素变化的重要方法之一,高精度的匹配结果有助于更快地发现变化地物,进行更新。VGI矢量数据具有几何和语义信息丰富的特点,但使用传统的矢量要素匹配算法难以发挥VGI矢量数据的优势。以城市VGI道路数据为研究内容,提出基于多层次蔓延的矢量要素匹配算法,将VGI数据和专业测绘数据进行匹配对比,从而实现道路变化增量信息的快速识别。  相似文献   

江西临川茅排地区金表地球化学作用研究     

张卫民  史维浚 《华东地质学院学报》1996,19(1):42-47

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