无人机影像辅助下的路桥病害智能检测     

彭瑶瑶  王思远  傅兴玉  申明  游永发 《测绘通报》2017,(8):67

路桥表面病害状况评估是路桥养护的一项重要内容。目前病害检测主要基于移动测量车和目视判断,具有工作量大、获取危险度高的缺点,而低空飞行的六旋翼无人机能够拍摄到人工无法获取到的多角度路桥照片,在路桥检测方面具有巨大的优势。本文基于无人机影像开展路桥病害检测相关研究,提出了一种新的路桥病害检测方法。首先通过多部件形变模型模拟病害目标,并在无人机影像中全局搜索,检测出潜在路桥病害区域。试验表明,本文算法在复杂背景下能够有效检测病害,目标检测精度达80%,具有很高的效率和鲁棒性。  相似文献   

3S技术在松材线虫病监测预警中的应用研究现状   总被引：3，自引：1，他引：2  

石雷  韦雪花  周汝良 《云南地理环境研究》2008,20(3):15-19

松材线虫病是一种林业上最具危险性、毁灭性的病害,通过分析3S技术及其特、松材线虫病的起源及其危害情况,综述3S技术在松材线虫病监测预警中的应用研究现状,提出利用中低分辨率遥感卫星数据在时间序列上的累计环境变化响应,结合GIS技术、人工智能等技术来监测松材线虫病是一种新方法,讨论了3S技术应用于松材线虫病监测存在的问题及研究方向。  相似文献   

鲢、鳙溶血性腹水病研究     

李庆乐  陆建仁 《广东海洋大学学报》1997,(2)

报道了鲢、鳙鱼溶血性腹水病的病原和防治方法。研究结果表明，该病无病毒性病原存在，病原为嗜水气单胞菌嗜水亚种（Aeromonashydrophilasubsp.hydrophila）。采用作者研制的鱼康乐（Y·K·L）进行治疗。治愈率达86．5‰。  相似文献   

RELATION BETWEEN WATER TEMPERATURE, WATER EXCHANGE AMOUNT, FEED AND PRAWN DISEASE   总被引：1，自引：0，他引：1  

臧维玲  戴习林  江敏  张建达  黄建华  孙绍永  徐桂荣  李士华 《中国海洋湖沼学报》1997,15(3):212-215

ImooUrnONTheedycarsePiddricofprawndiscaseintheprawnculturecoastalarmsofChi-naandsoutheastAsiaresultedinnoproduCtinnoutputfromrnostprawnpondsandheaVyerenoAnclosscyumbull,l994).Upt0now,devemeasimtopreventandtreatthediseasehavenotbopresental,althoughwaterenvironmentdeteriorationisconunn-lyknowntobethekcyfactorcausingthisdhase(Jiang,l994).ThispreliIninrystudyonthereati0nsbetweenprawndiseaseandfactorsthatseriouslyaffodwatetenvirDimtalquality(WaterteInPeratllre,waterexchangeamount,andarnountSa…  相似文献   

GEOGRAPHICAL ENVIRONMENTAL CHARACTERISTICS OF ENDEMIC FLUOROSIS IN CHINA     

陈国阶 《中国地理科学(英文版)》1991,1(4):324-336

Endemic fluorosis is given rise to by human intake of excess fluorine from environment by way of food chain. In China it is one of the extensively prevalent endemic diseases and its distribution shows clearly regional characteristics. In macroscopic sight, three large fluorosis zones may be divided: (1) The arid and semi-arid plains in the north of China. These regions have a dry climate, making fluorine accumulation in the Quaternary deposits. Thus, the drinking water with high content of fluorine is the main cause of the disease formation. (2) The Yunnan-Guizhou Plateau. In the region, rocks and soils rich in fluorine bring about fluorine excess in crop food. This plays an important role in the disease formation. (3) Southeast hills. The hot spring with high content of fluorine leads to fluorosis.The fluorine absorbed by people from the environment is firstly from the drinking water and secondly from the crop food originating from soil. The fluorine in the air can be accumulated in crop leaves to make  相似文献   

湛江地区沿海游泳虾类调查报告     

冯玉爱  张珍兰 《广东海洋大学学报》1989,(Z1)

本文整理了真虾类标本共21种,隶属6科9属,其中有的种类是虾捕捞业中常见的种类,有一定的产量;有的种类是虾养殖中的敌害。  相似文献   

BOOK REVIEWS     

《The Professional geographer》1987,39(4):487-521

Book Reviewed in this article: Geographical Aspects of Health and Disease in India . Rais Akhtar and A.T.A. Learmonth , eds . Antarctic Treaty System: An Assessment . Proceedings of a Workshop at Beardmore South Field Camp, Antarctica. American Electoral Mosaics . J. Clark Archer and Fred M. Shelley . Kompas op Suidwes-Afrika/Namibie . W.S. Barnard , ed . Jerusalem in the 19th Century: The Old City . Yehoshua Ben -Arieh . The World as a Total System . Kenneth E. Boulding . A Social History of Housing 1815–1985, Second Ed . John Burnett . Human Migration . W.A.V. Clark . Regional Population Projection Models . Andrei Rogers . The State of Population Theory: Forward from Malthus . David Coleman and Roger Schofield , eds . Imagining Tomorrow: History, Technology and the American Future . Joseph C. Corn , ed. Swidden Agriculture in Indonesia: The Subsistence Strategies of the Kalimantan Kantú . Michael R. Dove . Glacial Geologic Processes . David Drewry . Physics of Desertification . Farouk El -Baz and M.H.A. Hassan , eds . Housing the Homeless . Jon Erickson and Charles Wilhelm , eds . Settlement Patterns in Missouri: A Study of Population Origins, with a Wall Map . Russel L. Gerlach . Desert Development: Man and Technology in Sparselands . Yehuda Gradus , ed . Nuclear Winter. The Evidence and Risks . Owen Greene , Ian Percival and Irene Ridge . The Take-off of Suburbia and the Crisis of the Central City . Günter Heinritz and Elisabeth Lichtenberger , eds . Regional Input-Output Analysis . Geoffrey J. D. Hewings . Spatial Transportation Modeling . Christian Werner . The Atlas of Georgia . Thomas W. Hodler and Howard A. Schretter , eds . Latin America. 5th ed . Preston E. James and C.W. Minkel . Applied Remote Sensing . C.P. Lo . Localities, Class, and Gender . The Lancaster Regionalism Group . Urban Social Movements: The City after Castells . Stuart Lowe . Politics and Method . Doreen Massey and Richard Meegan , eds . Land Use . A. S. Mather . The Kingdom of Coal . Donald L. Miller and Richard E. Sharpless . The Presidio and Militia on the Northern Frontier of New Spain, A Documentary History, Vol. 1: 1570–1700 . Thomas H. Naylor and Charles W. Polzer , S.J., comps . and eds . Nuclear Power: Siting and Safety . Stan Openshaw . The Central African Republic: The Continent's Hidden Heart . Thomas O'Toole . Environmental and Dynamic Geomorphology . Márton Pécsi , ed . Remote Sensing Principles and Interpretation . Floyd F. Sabins , Jr . Acid Rain and Friendly Neighbors: The Policy Dispute between Canada and the United States . Jurgen Schmandt and Hilliard Roderick , eds . Earth's Changing Surface: An Introduction to Geomorphology . M.J. Selby . International Migration: The Female Experience . Rita J. Simon and Caroline B. Brettell , eds . On Geography and Its History . D.R. Stoddart . Transportation Networks: A Quantitative Approach . D. Teodorovic . Processes in Physical Geography . R.D. Thompson , A.M. Mannion , C.W. Mitchell , M. Parry , J.R.G. Townshend . Imaging Radar for Resources Surveys . J.W. Trevett . Dominance and Affection: The Making of Pets . Yi -Fu Tuan . Capturing the Horizon. The Historical Geography of Transportation since the Transportation Revolution of the Sixteenth Century . James E. Vance , Jr . Nations at Risk: The Impact of the Computer Revolution . Edward Yourdon .  相似文献   

The simulation of airborne disease virus transmission in group buildings     

Xueyi YOU 《中国地球化学学报》2006,25(B08):111-111

With the densification of population and the deterioration of urban ecological cycle, the airborne disease virus is becoming a new crisis for human. It is well known that airborne disease virus such as smallpox, hives, mumps and SARS can cause respiratory disease by the aerosol of sneezes or cough of infected person. The pathogens release virus aerosol to the environment. If the virus can live some time in the air, it can go with air flowing far away. The aim of the present research is to simulate the transportation of airborne disease virus in a group of buildings by taking into account the time-dependent virus aerosol source. A commonly used virus-host dynamical model is introduced to simulate the time-dependent development of virus aerosol releasing process. The wind velocity field is described by the continuity equation, momentum equation and turbulence model to enclose the Reynolds stress in the momentum equation. The RNG model is used in all simulations. The aerosol of microbial pollutant is assumed flowing at the same velocity as the air. The computation time is one life cycle of virus T. We assume that the pathogens release virus aerosol at the upper wall of building A. The conclusions are： （1） The microbial pollutant begins to be discharged after its delitescence 1/12 T. As the virus goes into logarithmic growth period, the concentration of virus and the pathogenic area increase very fast. After entering the virus decay period （1/3 T）, the pathogenic area decreases. It should be noticed that no secondary infection is considered in present simulation. Generally, as the virus concentration is above the pathogenic concentration, new pathogens will be infected and release virus aerosol to the environment. With the increase of new pathogens, the pathogenic area would increase very fast and finally result in the outbreak of infection.  相似文献   

桃红四物汤合七味白术散治疗糖尿病合并冠心病50例          下载免费PDF全文

吴海艳  孙伯青  赵星海 《应用海洋学学报》2022,38(10):17

目的：观察桃红四物汤合七味白术散治疗气阴两虚兼血瘀型糖尿病合并冠心病的临床疗效。方法：将100 例糖尿病合并冠心病患者随机分为治疗组和对照组,每组各50 例。对照组给予西医常规治疗,治疗组在对照组基础上加用桃红四物汤合七味白术散治疗。治疗12周后,观察2组的综合疗效,中医证候积分,实验室指标［空腹血糖（FBG）、糖化血红蛋白（HbA1c）、总胆固醇（TC）、三酰甘油（TG）、低密度脂蛋白胆固醇（LDL-C）、高密度脂蛋白胆固醇（HDL-C)、 C反应蛋白（CRP）、同型半胱氨酸（HCY）］,颈动脉内膜中层厚度（IMT）,颈部血管斑块大小以及安全性。结果：总有效率治疗组为94.0%（47/50）,对照组为72.0%（36/50）,2组比较,差异有统计学意义（P<0.05）。2组中医证候积分、TC、TG、LDL-C、CRP、HCY、IMT、斑块大小均较治疗前改善,且组间比较（除TC外）,差异均有统计学意义（P<0.05）。2组均未发生不良反应。结论：桃红四物汤合七味白术散治疗气阴两虚兼血瘀型糖尿病合并冠心病疗效显著,可减轻患者的临床症状,改善血管内皮功能,降低IMT水平,缩小颈部血管斑块,从而达到预防和减缓心血管事件发生的目的。  相似文献   

中国手足口病时空分异特征及影响因素     

宋飏  刘艳晓  张瑜  王士君 《地理学报》2022,77(3):574-588

健康中国战略是中国新时期的重大战略之一,手足口病作为全球关注的公共卫生问题,已成为中国影响范围较为广泛和普遍的典型传染性疾病,尤其对婴幼儿健康造成巨大威胁。本文构建健康地理学视角下的传染病研究理论框架,采用集中度和空间分析方法解析中国2008—2017年手足口病发病时空分异特征和变化规律,对18个影响其发病的风险因子进行空间相关和地理探测,揭示手足口病地理分异的主要影响因素和作用机理。结果表明：① 健康地理学视角下的传染病研究理论框架由传染病发病的基本环节、影响因素和分布扩散状态3个子系统构成,各子系统之间及子系统内部相互影响相互作用。② 2008—2017年中国手足口病发病率呈现波动上升、两年为一周期且偶数年份高于奇数年份的发病规律,春末夏初及秋末冬初为发病高峰。③ 2008—2010年手足口病发病率未体现明显的空间集聚特征;2011—2017年发病率存在较强的空间自相关性,热点地区主要集中在广东、广西、海南等地区,且呈现自北向南、自小而分散向大而集中的演变趋势;发病典型地区可以总结为气候湿热区、经济落后且医疗水平低的地区和易集聚感染的人口密集区3种。④ 有12项因素通过了相关分析和地理探测的显著性检验,与手足口病发病率体现正向作用的因素解释力从大到小依次为“气温>年降水量>湿度>气压>人口密度>路网密度>人均GDP”,负向相关关系作用大小依次为“日照时数>风速>AQI指数>海拔>千人床位数”,气温和降水量与其他因子的交互作用最为明显。本文为健康地理学、手足口病病理学、流行病学的相关研究提供实证检验基础,为服务健康中国战略和流行病预防与控制提供重要科学支撑和政策参考。  相似文献