基于Faster R-CNN的野外环境中蝗虫快速识别     

武英洁  房世波  Piotr Chudzik  Simon Pearson  Bashir Al-Diri  冯旭宇  李云鹏 《气象与环境学报》2020,36(6):137-143

蝗虫是常见的害虫之一,对农作物和生态系统具有很大的危害,采用常规的方法对蝗虫进行监测存在一定局限性,为了有效应用海量野外影像数据实现对蝗虫实时监测,本文建立了一种基于深度学习网络的蝗虫自动识别模型。利用手机模拟摄像头获取的内蒙古锡林浩特附近草原的280张蝗虫的RGB图像,采用深度学习算法中的Faster R-CNN（Faster Region-based Convolutional Neural Network）网络结构建立了蝗虫识别模型。经验证该模型的精确度为0.756,可以较准确地将蝗虫从野外复杂环境中识别出来,与以往同类研究相比,在识别结果和实用性方面均有较大的进步。该模型是建立蝗虫实时监测系统的基础,可以为蝗虫的防治提供辅助信息,同时该网络结构还可以应用于其他害虫的识别,具有较强的推广性,拓宽了深度学习算法的应用领域。  相似文献   

俄远东、中国东北的构造特点及岩石圈深部的不均一性     

赵春荆  何国琦  段瑞焱 《国土资源》1995,(4)

俄罗斯远东和中国东北前新生代可划分为８个大地构造单元。区域地质、深部地质、地球物理及新构造研究表明，地壳和地幔深部的不均一性反映了该区主要构造单元的深部构成和大地动力学等方面的特点。地热和地磁资料表明，远东地区软流层顶部具有起伏形态的特点，最大深度２００～２５０ｋｍ，浅部仅１００～１４０ｋｍ，松辽盆地７５～１００ｋｍ；在中国东北及亚太过渡带上地幔低速层厚度在０～１００ｋｍ之间变化，计算数据表明，本区地壳厚度为３０～４４ｋｍ，变化幅度为１４ｋｍ。  相似文献   

Structural Control of Sand Bodies and Deep Exploration for Oil and Gas     

Cheng Rihui  Lin Changsong  ZHENG Herong 《世界地质(英文版)》2002,5(2)

The structural styles can be used to analyses and predict developments and distributions of sand bodies in a rift basin. The dynamic process of faulting and sedimentation can be expressed as follow: the basin topography controlled by fault activity can control water dynamics; which in turn affect the transport and sedimentation of sediments. The corresponding analysis between structural styles and sand depositional types includes the following aspects: (1) in section, the corresponding between development of fault terraces and sand depositional types; (2) in plane, the relationship between faults' association and distributions of sand bodies. There are four types of terrace styles to be identified. They are Steep Slope Single Fault Terrace (SSSFT), Steep Slope Multiple Fault Terrace (SSMFT), Gentle Slope (GS) and Gentle Slope Multiple Fault Terrace (GSMFT), which also can be divided into six subtypes by the timing of the faults activities and the directions of their activity migrations (basinward and landward or marginward). They correspond to the following sand depositions such as alluvial fan, fan delta and turbidite fan etc.. The analysis of structure-sedimentation is a discussion on the rank Ⅲ sequence evolution under the condition of pulsing or episodic fault activities. It has been recognized four plane fault associations such as the comb, the broom, the fork and the fault-fold association as well as the corresponding sand distributions. Structural-sedimentary models above mentioned are significant for the deep oil and gas exploration when lacking of the drill data. It may reduce multiple resolutions in the interpretation of seismic-sedimentary facies and promote sand predictions through the constraints of the structural styles of the basin units. The structural-sedimentary pattern can be used as a geological model in oil and gas exploration in the rift basins.  相似文献   

Imaging Borrelly     

L.A Soderblom  D.C Boice  R.H Brown  R.L Kirk  R.M Nelson  B.R Sandel  N Thomas 《Icarus》2004,167(1):4-15

The nucleus, coma, and dust jets of short-period Comet 19P/Borrelly were imaged from the Deep Space 1 spacecraft during its close flyby in September 2001. A prominent jet dominated the near-nucleus coma and emanated roughly normal to the long axis of nucleus from a broad central cavity. We show it to have remained fixed in position for more than 34 hr, much longer than the 26-hr rotation period. This confirms earlier suggestions that it is co-aligned with the rotation axis. From a combination of fitting the nucleus light curve from approach images and the nucleus' orientation from stereo images at encounter, we conclude that the sense of rotation is right-handed around the main jet vector. The inferred rotation pole is approximately perpendicular to the long axis of the nucleus, consistent with a simple rotational state. Lacking an existing IAU comet-specific convention but applying a convention provisionally adopted for asteroids, we label this the north pole. This places the sub-solar latitude at ∼60° N at the time of the perihelion with the north pole in constant sunlight and thus receiving maximum average insolation.  相似文献   

The connection between Labrador Sea buoyancy loss, deep western boundary current strength, and Gulf Stream path in an ocean circulation model     

Stephen G. Yeager  Markus Jochum 《Ocean Modelling》2009,30(2-3):207-224

The sensitivity of the North Atlantic gyre circulation to high latitude buoyancy forcing is explored in a global, non-eddy resolving ocean general circulation model. Increased buoyancy forcing strengthens the deep western boundary current, the northern recirculation gyre, and the North Atlantic Current, which leads to a more realistic Gulf Stream path. High latitude density fluxes and surface water mass transformation are strongly dependent on the choice of sea ice and salinity restoring boundary conditions. Coupling the ocean model to a prognostic sea ice model results in much greater buoyancy loss in the Labrador Sea compared to simulations in which the ocean is forced by prescribed sea ice boundary conditions. A comparison of bulk flux forced hindcast simulations which differ only in their sea ice and salinity restoring forcings reveals the effects of a mixed thermohaline boundary condition transport feedback whereby small, positive temperature and salinity anomalies in subpolar regions are amplified when the gyre spins up as a result of increased buoyancy loss and convection. The primary buoyancy flux effects of the sea ice which cause the simulations to diverge are ice melt, which is less physical in the diagnostic sea ice model, and insulation of the ocean, which is less physical with the prognostic sea ice model. Increased salinity restoring ensures a more realistic net winter buoyancy loss in the Labrador Sea, but it is found that improvements in the Gulf Stream simulation can only be achieved with the excessive buoyancy loss associated with weak salinity restoring.  相似文献   

德州市深层地下水人工回灌试验浅探   总被引：1，自引：0，他引：1  

王贞国  王彦俊  冯守涛  陈玲伦  季春来 《山东国土资源》2005,(Z1)

德州市德城区由于长期开采深层地下水,引起了水位区域性大幅度下降,形成了大面积地下水降落漏斗,并产生了地面沉降等不良地质环境问题。为保护德州市地质环境和深层地下水资源,于2002年开展了深层地下水人工回灌试验。根据回灌试验成果和深层地下水目前开采强度推算,利用德城区现有部分(65%)深机井在丰水季节进行人工回灌,单井回灌量保持1200m3/d,每年保持90d的回灌时间,回灌量可达到1080×104m3/a,可增可采资源量675×104m3/a。因此开展人工回灌可以有效地补给地下水源,解决深层地下水资源枯竭问题。  相似文献   

Predicting suitable habitat for the cold-water coral Lophelia pertusa (Scleractinia)     

Andrew J. Davies  Max Wisshak  James C. Orr  J. Murray Roberts   《Deep Sea Research Part I: Oceanographic Research Papers》2008,55(8):1048-1062

Ecological-niche factor analysis (ENFA) was applied to the reef framework-forming cold-water coral Lophelia pertusa. The environmental tolerances of this species were assessed using readily available oceanographic data, including physical, chemical, and biological variables. L. pertusa was found at mean depths of 468 and 480 m on the regional and global scales and occupied a niche that included higher than average current speed and productivity, supporting the theory that their limited food supply is locally enhanced by currents. Most records occurred in areas with a salinity of 35, mean temperatures of 6.2–6.7  °C and dissolved oxygen levels of 6.0–6.2 ml l⁻¹. The majority of records were found in areas that were saturated with aragonite but had low concentration of nutrients (silicate, phosphate, and nitrate). Suitable habitat for L. pertusa was predicted using ENFA on a global and a regional scale that incorporated the north-east Atlantic Ocean. Regional prediction was reliable due to numerous presence points throughout the area, whereas global prediction was less reliable due to the paucity of presence data outside of the north-east Atlantic. However, the species niche was supported at each spatial scale. Predicted maps at the global scale reinforced the general consensus that the North Atlantic Ocean is a key region in the worldwide distribution of L. pertusa. Predictive modelling is an approach that can be applied to cold-water coral species to locate areas of suitable habitat for further study. It may also prove a useful tool to assist spatial planning of offshore marine protected areas. However, issues with eco-geographical datasets, including their coarse resolution and limited geographical coverage, currently restrict the scope of this approach.  相似文献   

Deep crustal reflection recordings in Australia 1957-1973—I. Data acquisition and presentation     

F. J. Moss  J. C. Dooley 《Geophysical Journal International》1988,93(2):229-237

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超大型会泽富锗铅锌矿复合成因   总被引：4，自引：0，他引：4  

薛步高 《云南地质》2006,25(2):143-159

会泽富锗铅锌矿。是近年老矿山深部找矿取得重大突破的典范,而其成因则是当前研究、讨论的热点。笔者认为该矿之形成,既非“MVT型”,亦非“VMS型”,而是与深部隐伏燕山期酸性岩有关的中温岩浆热液叠加、改造、富化的复成因矿床。自加里东期起长期处于张裂环境。深部昭通．弥勒硅镁层隆起,既是幔源玄武岩（热地幔柱）上涌的前奏,又为深部矿源上升创造畅通空间。与多旋回活动的小江深断裂相沟通的NE向矩形断裂网,是导矿、输矿、储矿的有利构造。继火山热液成矿之后,伴随燕山期褶皱、断裂和深部酸性岩浆的上升,发生第二期叠加矿化．矿石中伴生与酸性岩有关的元素组合．并以与酸性岩有关的锗富集为特征。  相似文献   

Mediterranean Neogene stratigraphy: development and evolution through the centuries     

MARIA BIANCA CITA 《Sedimentology》2009,56(1):43-62

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