基于无人机的配电导线断股缺陷检测系统设计与实现     

李飞伟  郁云忠  袁林峰  许超  陈佳煜  严文君  李俊  刘争 《测绘地理信息》2021,46(4):132-135

配电导线的状态对用电需要和用电安全而言有着重要的意义,当配电导线处于断股状态时,将可能导致严重用电事故.传统断股检视方法常依赖于人工,费时费力.为此,本文设计与研发了一套基于无人机影像的配电导线断股缺陷实时在线检测系统.该系统利用无人机获取配电导线影像,通过WiFi和WinSock机制完成影像数据传输;采用FCN网络而对获取的影像进行图像分割,仅保留导线信息.针对断股导线特有的图像特征,采用滑动窗口思想,沿导线轴向方向提取窗口内的图像特征参数,查找异常特征参数窗口,从而实现断股导向的自动检测.最后基于实测数据对系统的实验效果进行了验证.结果表明数据传输保持稳定、配电导线断股智能识别准确性高,所设计和研制的系统对配电导线安全检查有重要意义.  相似文献   

中更新世以来西菲律宾海上层水体结构演化特征——来自钙质超微化石Florisphaera profunda的证据   总被引：1，自引：1，他引：0       下载免费PDF全文

孙晗杰  李铁刚  苏翔  孙荣涛  于心科  常凤鸣  唐正 《第四纪研究》2011,31(2):216-226

MD06-3050岩芯位于西非律宾海吕宋岛以东本哈姆高原,利用钙质超微化石下透光带种属Florisphaera profunda占总颗石的相对卡度,恢复了中更新世以来该海区的上层水体结构演化特征.结果显示,西菲律宾海区自1040ka以来,温跃层/营养跃层经历了由浅-深-浅-深的长周期变动.可能是由于全球碳库的长周期变化...  相似文献   

祁连山夏季地形云综合探测试验   总被引：1，自引：0，他引：1  

郑国光  陈跃  陈添宇  陈乾  朱君鉴  李照荣 《地球科学进展》2011,26(10):1057-1070

2006年和2007年夏季在祁连山冷龙岭西段开展了地形云云量、云状、大气水汽、风场、雨滴谱和雨强等的综合探测试验,以分析祁连山地形云的特征。结果表明：①祁连山区夏季云量丰富,平均云量在6成以上。西南气流天气背景下总云量多达8成;②祁连山夏季无降水日大气水汽非常少,700 hPa以上层大气相对湿度大多在20%以下;③西南气流背景下祁连山南北侧山谷风的共同作用,气流昼间向山顶辐合,夜间向山谷辐散,当水汽条件充足时,极易抬升形成可以产生降水的地形云;④祁连山降水主要由小于1 mm的雨滴组成。  相似文献   

Noble Gas Diffusion Mechanism in Lunar Soil Simulant Grains:Results from ~4He~+ Implantation and Extraction Experiments     

付晓辉  邹永廖  郑永春  贺怀宇  欧阳自远 《中国地质大学学报(英文版)》2011,(5)

Experiments on ion implantation were performed in order to better characterize diffusion of noble gases in lunar soil.4He+ at 50 keV with 5×1016 ions/cm2 was implanted into lunar simulants and crystal ilmenite.Helium in the samples was released by stepwise heating experiments.Based on the data,we calculated the helium diffusion coefficient and activation energy.Lunar simulants display similar 4He release patterns in curve shape as lunar soil,but release temperatures are a little lower.This is probably a con...  相似文献   

濮阳市主要地下水环境问题及防治对策研究     

龚晓洁  袁征  陈光宇  杨坡 《地下水》2011,(1):80-81

随着濮阳这座新兴城市的迅猛发展,出现了一些列环境地质问题,通过对水资源衰竭、地下水污染、地面沉降、特殊岩土体、采油污染等主要环境地质问题的论述,分析其成因及演化趋势,并提出相应的防治对策,将对其他位于黄河下游冲积平原的城市具有积极的借鉴意义。  相似文献   

基于ArcGIS的DEM流域划分   总被引：2，自引：0，他引：2  

程峥  李永胜  高微微 《地下水》2011,(6):128-130

从数字高程模型DEM(Digit Elevation Models)直接提取河网及流域信息,是分布式水文模型开发与应用的基础.本文利用ArcGIS中的水文分析工具从DEM中提取了流域水文特征.主要包括:DEM的预处理、水流方向的确定、水流累积量提取、河网的提取、集水区的提取和流域的划分.本文探讨了两种不同划分流域的方法...  相似文献   

Fractal-statistical analysis of grain-size distributions of debris-flow deposits and its geological implications     

Huayong Ni  Wanmo Zheng  Xilin Liu  Yanchao Gao 《Landslides》2011,8(2):253-259

Breakage models and particle analyses have been widely used as tools for describing and interpreting various deposits and providing parameters for assessing the particle-size distribution of the deposits. Debris flows can be seen as a two-phase rheological fluid with a clay-fluid composition, and debris-flow deposits comprise mud, silt, sand, and boulders, with grain sizes ranging from less than one μm to more than several meters. As a consequence, according to fractal theory, the particles in debris-flow deposits have self-similarity in geometrical shape and scale invariance in size. In this paper, the fractal dimensions of particles in various debris-flow deposits are calculated and corresponding fractal features are determined based on fractal-statistical theory. The aims of the study are: to provide a quantitative grain parameter that reflects both the grain composition and grain-size distribution in debris-flow deposits; to compare the fractal dimensions of grains in different types of debris-flow deposits and the degree of self-organization of debris flows; as well as to discuss the geological implications of fractal dimensions and fractal features of particles in debris-flow deposits.  相似文献   

The <Emphasis Type="Italic">n</Emphasis>-alkanol paleoclimate records in two peat deposits: a comparative study of the northeastern margin of the Tibetan Plateau and Northeast China     

Yanhong Zheng  Weijian Zhou  Zhao Liu  Xiaomin Liu 《Environmental Earth Sciences》2011,63(1):135-143

A number of studies have revealed that the climate in the eastern margin of the Tibetan Plateau and Northeast China is sensitive to postglacial changes. Unfortunately, the link of the past climate evolution between the two regions is not well understood. In this study, two cores are analyzed to determine this link directly. The high-resolution n-alkanol distribution patterns from two typical peat sequences covering the past 16,000 cal years in the northeastern margin of the Tibetan Plateau and Northeast China, respectively, are closely examined by gas chromatograph–mass spectrometry analysis. In combination with other palaeoclimatic proxies, it is proposed that the n-alkanol average chain length and (C₂₂ + C₂₄)/(C₂₆ + C₂₈) ratio could reflect past climate changes in the two peat sequences. The n-alkanol proxies reveal several climatic intervals in the period from the last deglaciation through the Holocene. A comparison of n-alkanol records between the northeastern margin of the Tibetan Plateau and Northeast China indicates that the start and end of the warm Holocene Optimum differed at the two locations. The spatially asynchronous pattern of climatic change is possibly a result of different responses to change in solar radiation. The evolution of the Holocene paleoclimate is more consistent with changes in Northern Hemisphere solar radiation in Northeast China than on the Tibetan Plateau. The Holocene Optimum began and terminated earlier in Northeast China than in the northeastern margin of the Tibetan Plateau. Thus, the two n-alkanol proxies provide valuable insights into the regional Holocene climate and local environmental conditions.  相似文献   

Resources and eco-environmental protection of salt lakes in China     

Mianping Zheng 《Environmental Earth Sciences》2011,64(6):1537-1546

The Chinese salt lake mega-region is controlled by an arid and semi-arid climate, and modern salt lakes are mainly distributed within areas with mean annual precipitation <500 mm. According to their geomorphological features, structural conditions, and material composition, salt lakes in China can be broadly divided into four regions. The degrees of exploitation and utilization of these salt lakes differ because these four regions have experienced different climatic changes and structural activities and have had their own characteristics of salt lake evolution since the beginning of the Quaternary. The salt lakes in these regions have different scales, economic value, and technical conditions for traffic. Among others, Jarantai (Jartai) Salt Lake and Yuncheng Salt Lake are better in terms of comprehensive utilization and environmental protection, and the potash salt lakes represented by Qarhan are most important in terms of exploitation. At present, there exist many environmental problems in the salt lake regions of China, especially in remote, small and medium-sized basins, where abusive or wasteful mining, low recovery, and mining of a single saline mineral have caused impoverishment and large quantities of byproducts. Furthermore, climatic environmental factors can also cause significant changes of salt lake environment. Since 1987, against the background of global warming, the climate in the northwest salt lake region has turned warm and wet, and lakes have exhibited a tendency for expansion and rise, whereas in the east of the region, the climate has remained in a warm dry stage, lake levels have dropped, and salt lakes have become desertified. With the implementation of the strategy of building an environmentally friendly society in China, increasing attention is being paid to eco-environmental protection. It is suggested that experience and advanced techniques in terms of comprehensive utilization, overall development, and environmental protection of salt lakes at home and abroad be further developed to strengthen observation and monitoring of environmental changes of salt lakes and build an environmentally friendly, great salt lake industry.  相似文献   

Impact of coastal engineering constructions on the topographic and morphological evolution of Quanzhou Bay, Fujian, China     

Chengqiang WuFeng Cai  Guangtao ZhaoYongling Zheng  Huiquan Lu 《Ocean & Coastal Management》2011,54(7):544-555

A series of port constructions and large-scale reclamation projects have been extensively carried out in Quanzhou Bay to pursue social and economic benefits. These projects have changed the natural topographical and morphological evolution since 1970. In this research, from comparison of topographical and morphological characteristics of the study area in 2008, 1972 and 1934, the obvious differences between two evolution stages (1934-1972 and 1972-2008) were analyzed, and the impact of coastal engineering constructions on the evolution of topography and morphology was evaluated quantitatively. The results show that evolution before the 1970s was characterized as a stable whole with local erosion in the channel and slow aggradation of the shoal and that the morphology was dominated by natural processes, as there was little coastal engineering construction before 1970. Since the 1970s, because of a series of engineering projects such as those reclaiming land and constructing ports, the bay has been in a stage of continuous silting, characterized by the channel narrowing and shrinking and shoal silting and expanding, which may result in the abandonment of ports around the bay and endanger the salt field, aquaculture and other agriculture. Potential solutions for the management of the coastal zone of Quanzhou Bay and other similar bays by state and local agencies are suggested, such as calling for the attention of the state and local government, strengthening coastal zone management, scientific planning and reasonable exploitation, and in particular, changing the utilization of the sea area.  相似文献