上派河大桥控制爆破拆除的施工实践     

黄世华  翁奉权  袁敏 《安徽地质》2009,19(4):280-283,290

运用控制爆破技术,成功完成对悬臂钢筋混凝土斜拉桥爆破拆除,其布孔、装药、防护等方面为同类工程提供了参考作用。  相似文献   

准噶尔盆地腹部地区头屯河组储层特征研究   总被引：1，自引：1，他引：0  

季敏  刘斌 《新疆地质》2009,27(1)

近年来,头屯河组已成为准噶尔盆地腹部地区勘探主要目的层系.该区头屯河组主要为河流相沉积,储层以岩屑砂岩和长石砂岩为主,含高岭石、绿泥石等粘土矿物.主要储集空间类型为粒间孔隙、粒内孔隙和微裂缝.通过分析,确定该组段储层为低渗-中渗型储层,影响物性主要因素有原始沉积作用、后生成岩作用和构造作用等.  相似文献   

面目标间拓扑关系形式化描述的层次模型   总被引：9，自引：3，他引：6  

邓敏  冯学智  陈晓勇 《测绘学报》2005,34(2):142-147

拓扑关系形式化描述和区分的标准是拓扑不变量.在4交差模型的基础上,通过对两面目标边界交集的信息深入分析,提出具有不同分类能力的拓扑不变量,分别是维数、分离数、分量类型和分量排列顺序,并依次建立相应的形式化描述模型.这些模型都是在其分类层次上对面目标间拓扑关系的完备描述,并且它们的区分能力是层次递进的.  相似文献   

远洋渔船动态监控系统研究   总被引：5，自引：0，他引：5  

季民  靳奉祥  李云岭  邵全琴 《测绘科学》2005,30(5):92-94

针对远洋渔业生产中的渔船监控问题,以卫星通讯、GIS、GPS、数据库等技术手段为支撑,进行了远洋渔船GPS动态监控系统的研究和开发工作。本文在介绍了系统总体框架的基础上,系统阐述了通讯文件的解包和数据质量的控制过程,并对渔船的动态监视和轨迹分析功能进行了论述。  相似文献   

生态建设背景下三江源自然保护区生态系统服务价值变化   总被引：1，自引：0，他引：1  

赖敏  吴绍洪  戴尔阜  尹云鹤  潘韬  赵东升 《山地学报》2013,(1):8-17

青海三江源是我国淡水资源的重要补给地,也是全国生态保护和建设工程的重点实施区域,对其开展生态恢复过程的生态系统服务价值变化研究,有利于揭示生态保护和建设工程的实施效果。在构建三江源生态系统服务价值评估指标体系的基础上,选择生态工程前后两个时间段(2000年和2008年),采用物质量和价值量相结合的方法对三江源自然保护区生态系统服务价值进行了评估和对比分析,结果表明:2000—2008年保护区生态系统服务总价值呈现明显的增长趋势,8 a间一共增加1.68×1010元。保护区草地生态系统的整体质量状况大幅度提升,生态系统服务价值增加48.69%,是由生态建设和气候因子变化共同作用的结果;森林生态系统服务价值增加12.71%,主要跟森林区域水热条件的改善有关;水体与湿地生态系统服务价值在8 a间减少56.08%,关键是由区域气温升高和降水量减少所致,而非人为因素的影响;2000—2008年间,保护区人口数量增加了26.08%,较高的人口增长压力促使大量的草地被开垦为农田,导致农田面积增加392.52%,从而引起农田生态系统服务价值大幅波动。  相似文献   

A new discovery of transition rules for cellular automata by using cuckoo search algorithm     

Min Cao  Quanfei Shen  Yanxia Wang 《International journal of geographical information science》2013,27(5):806-824

This paper presents an intelligent approach to discover transition rules for cellular automata (CA) by using cuckoo search (CS) algorithm. CS algorithm is a novel evolutionary search algorithm for solving optimization problems by simulating breeding behavior of parasitic cuckoos. Each cuckoo searches the best upper and lower thresholds for each attribute as a zone. When the zones of all attributes are connected by the operator ‘And’ and linked with a cell status value, one CS-based transition rule is formed by using the explicit expression of ‘if-then’. With two distinct advantages of efficient random walk of Lévy flights and balanced mixing, CS algorithm performs well in both local search and guaranteed global convergence. Furthermore, the CA model with transition rules derived by CS algorithm (CS-CA) has been applied to simulate the urban expansion of Nanjing City, China. The simulation produces encouraging results, in terms of numeric accuracy and spatial distribution, in agreement with the actual patterns. Preliminary results suggest that this CS approach is well suitable for discovering reliable transition rules. The model validation and comparison show that the CS-CA model gets a higher accuracy than NULL, BCO-CA, PSO-CA, and ACO-CA models. Simulation results demonstrate the feasibility and practicability of applying CS algorithm to discover transition rules of CA for simulating geographical systems.  相似文献   

A procedural modelling method for virtual high-speed railway scenes based on model combination and spatial semantic constraint     

Jun Zhu  Heng Zhang  Min Chen  Zhu Xu  Hua Qi  Lingzhi Yin 《International journal of geographical information science》2013,27(6):1059-1080

  相似文献   

多尺度地图面/面目标匹配模式及变化探测方法研究     

简灿良  赵彬彬  邓敏  余丽钰 《地理与地理信息科学》2013,29(5)

多尺度地图数据更新的一个重要途径就是通过目标匹配技术获得已更新与待更新的不同比例尺地图之间表达同一地物的候选空间目标,并对候选匹配目标对进行比较,以便获得匹配目标间的差异以及发现未匹配的目标;进而,分析判断差异是否由该目标所表达的地理要素的实际变化所导致。该文以面目标匹配为例,对多尺度地图面目标匹配对的差异驱动因素和变化类型进行分析,针对不同模式的目标匹配对提出了利用长度差异、面积差异和重叠度指标进行差异驱动因素判别、变化探测和变化类型判定的方法,并验证了该方法的有效性和实用性。  相似文献   

湘南石牛寨玻璃用脉石英矿(南矿段)地质特征及成因浅析     

蒙正勇  胡敏  郭爱民  张小强  郭广湘 《国土资源导刊(湖南)》2022,19(1):42-47

湘南石牛寨矿区位于彭公庙岩体中,控矿构造为炎陵—宜章断裂带(F47)的平行次级断裂,两侧围岩为加里东期黑云母二长花岗岩,具有较好的脉石英矿成矿条件.该矿区(南矿段)矿石质量好,SiO2质量分数为95.76％～96.90％,平均质量分数为96.36％;Al2O3质量分数为1.79％～2.50％,平均质量分数为2.03％;...  相似文献   

Current state of heterotrophic bacterioplankton in the Kosinskie Lakes     

V. V. Il’inskii  I. V. Mosharova  A. Yu. Akulova  S. A. Mosharov 《Water Resources》2013,40(5):518-527

From December 2009 to December 2010, the total abundance of bacteria, the abundance of bacteria with electron transport chain, the abundance of viable saprotrophic bacteria, and the concentration of chlorophyll a were studied in water samples from lakes Svyatoe, Beloe, and Chernoe in Kosino-Ukhtomskoe district, Moscow City. The abundance of bacteria with active electron transport chain (CTC+bacteria) and its seasonal variations in Kosinskie Lakes are studied for the first time. Those lakes were found to contain well-developed and actively functioning heterotrophic bacterioplankton, the abundance of which have increased considerably since the 1930s–1940s. The seasonal dynamics of bacterioplankton has also changed. The largest absolute abundance of CTC+bacteria in lakes Svyatoe and Beloe was recorded in summer and autumn (from August to November). The abundance peak of CTH+bacteria in Lake Svyatoe was recorded in September and that in Lake Beloe, in October. The abundance of CTC+bacteria also showed a peak in April. In Lake Chernoe, the abundance of CTC+bacteria was much less than in lakes Svyatoe and Beloe; its maximums were recorded in December 2009 and April 2010. The share of CTC+bacteria in the total abundance of bacteria was 2.4–19.2% in Lake Svyatoe, 1.8–63.0% in Lake Beloe, and 0.96–22.5% in Lake Chernoe. Significant correlations were found to exist in all three lakes between the abundance of active bacterioplankton fraction and chlorophyll a content of water.  相似文献