检索结果-南通市图书馆

维普期刊数据库博看期刊

Three-dimensional magnetotelluric modeling in the spherical and Cartesian coordinate systems:A comparative study

在线全文

学校读者我要写书评

暂无评论

Earth and Planetary Physics 2023年第4期7卷 499-512页

作者： Qi Han xiangyun hu School of Geophysics and Geomatics China University of GeosciencesWuhan 430074China China University of Geosciences Press Wuhan 430074China

With the increase in the coverage area of magnetotelluric data,three-dimensional magnetotelluric modeling in spherical coordinates and its differences with respect to traditional Cartesian modeling have gradually attracted *** fully understand the influence of the Earth’s curvature and map projection deformations on Cartesian modeling,qualitative and quantitative analyses based on realistic three-dimensional models need to be *** with five representative map projections,a type of model conversion method that transforms the original spherical electrical conductivity model to Cartesian coordinates is described in this *** apparent resistivity differences between the spherical western United States electrical conductivity model and the corresponding five Cartesian models are then *** results show that the cylindrical equal distance map projection has the smallest error.A meridian convergence correction resulting from the deformation of the map projection is introduced to rotate the Cartesian impedance tensor from grid north to geographic north,which reduces differences from the spherical *** the basis of the magnetotelluric field data,the applicability of the Cartesian coordinate system to western and contiguous United States models is quantitatively *** interpretations of the contiguous United States model were found to require spherical coordinates.

关键词： spherical magnetotelluric modeling model conversion realistic electrical conductivity model quantitative evaluation

How to Effectively Prevent and Mitigate Geomagnetic Hazard?

在线全文

学校读者我要写书评

暂无评论

Journal of Earth Science 2023年第4期34卷 1304-1305页

作者： xiangyun hu Bo Han Tao Yu Institute of Geophysics&Geomatics China University of GeosciencesWuhan 430074China Institute of Geological Survey China University of GeosciencesWuhan 430074China

Compared to well-known geological hazards such as earthquakes, volcanic eruptions, landslides, and mudslides, the concept of “geomagnetic hazards” is much less familiar to people. Geomagnetic hazards are intense disturbances in the Earth’ s magnetic field caused by solar flares, which can lead to geomagnetic storms. These storms ignite large geomagnetic induction currents and disrupt the global upper atmospheric and ionospheric environment.

关键词： storm geomagnetic volcanic

基于变维度贝叶斯反演的地热黏土盖层音频大地电磁探测能力研究

在线全文

学校读者我要写书评

暂无评论

地质科技通报 2024年第3期43卷 341-350页

作者：朱悦彭荣华胡祥云周文龙黄顺聪鲁杏中国地质大学(武汉)地球物理与空间信息学院武汉430074 安徽省勘查技术院地质矿产勘查局能源勘查中心合肥230031

在地热探测中,黏土盖层作为水热型地热系统的典型标志,其埋藏深度及分布范围可为圈定地热资源的范围及确定地热钻井位置提供重要依据。黏土盖层通常由水热作用所形成的黏土层所构成,表现为低阻特征,利用音频大地电磁法可以对低阻盖层有... 详细信息

在地热探测中,黏土盖层作为水热型地热系统的典型标志,其埋藏深度及分布范围可为圈定地热资源的范围及确定地热钻井位置提供重要依据。黏土盖层通常由水热作用所形成的黏土层所构成,表现为低阻特征,利用音频大地电磁法可以对低阻盖层有效成像。为了获得黏土盖层位置分布及成像结果的不确定性信息,采用一维变维度贝叶斯反演方法,利用音频大地电磁数据对地热区低阻盖层的探测能力进行研究。首先进行模型试验,建立一个典型地热系统的地电模型,利用一维变维度贝叶斯算法对合成数据进行反演,获得地下电性结构和界面位置不确定性信息。接着将其应用于山西阳高地热区一条实测音频大地电磁数据处理。模型试验发现该方法对低阻黏土盖层具有较为准确的识别能力,所获得的低阻盖层上、下界面不确定分析的结果也较为可靠。实测数据试验发现,该方法对浅层低阻盖层具有较好的识别能力,并可以给出盖层界面位置的不确定性评价。该测线的二维非线性共轭梯度反演结果验证了一维贝叶斯反演的可靠性。该方法对浅层地热黏土盖层具有较准确的成像能力和不确定性分析能力,在地热探测中具有较强的应用前景。

关键词：地热探测黏土盖层大地电磁贝叶斯反演水热型地热系统

维普期刊数据库博看期刊

Luojia-HSSR:A high spatial-spectral resolution remote sensing dataset for land-cover classification with a new 3D-HRNet

在线全文

学校读者我要写书评

暂无评论

Geo-Spatial Information Science 2023年第3期26卷 289-301页

作者： Yue Xu Jianya Gong Xin huang xiangyun hu Jiayi Li Qiang Lie Min Penge School of Remote Sensing and Information Engineering Wuhan UniversityWuhanChina State Key Laboratory of Information Engineering in Surveying Mapping and Remote SensingWuhan UniversityWuhanChina hubei Luojia Laboratory WuhanChina Institute of Artificial Intelligence in Geomatics Wuhan UniversityWuhanChina Data Center Shenyang Surveying and Mapping Institute Co.LtdShenyangChina

High Spatial and Spectral Resolution(HSSR)remote-sensing images can provide rich spectral bands and detailed ground information,but there is a relative lack of research on this new type of remote-sensing *** there are already some HSSR datasets for deep learning model training and testing,the data volume of these datasets is small,resulting in low classification accuracy and weak generalization ability of the trained *** this paper,an HSSR dataset Luojia-HSSR is constructed based on aerial hyperspectral imagery of southern Shenyang City of Liaoning Province in *** our knowledge,it is the largest HSSR dataset to date,with 6438 pairs of 256×256 sized samples(including 3480 pairs in the training set,2209 pairs in the test set,and 749 pairs in the validation set),covering area of 161 km2 with spatial resolution 0.75 m,249 Visible and Near-Infrared(VNIR)spectral bands,and corresponding to 23 classes of field-validated ground *** is an ideal experimental data for spatial-spectral feature ***,a new deep learning model 3D-HRNet for interpreting HSSR images is *** conv-neck in HRNet is modified to better mine the spatial information of the ***,a 3D convolution module with attention mechanism is designed to capture the global-local fine spectral information ***,the 3D convolution is inserted into the HRNet to optimize the *** experiments show that the 3D-HRNet model has good interpreting ability for the Luojia-HSSR dataset with the Frequency Weighted Intersection over Union(FWIoU)reaching 80.54%,indicating that the Luojia-HSSR dataset constructed in this paper and the proposed 3D-HRnet model have good applicable prospects for processing HSSR remote sensing images.

关键词： High Spatial and Spectral Resolution(HSSR) remotesensing image classification deep learning Convolutional Neural Network(CNN)

基于网络药理学和分子对接分析车前草防治畜禽腹泻的作用机制

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中国兽医杂志 2024年第3期60卷 119-125页

作者：韦国旺黄甫克胡湘云盛双韦良炬韦宣亦广西河池市科学技术情报研究所广西河池547000 广西农业职业技术大学畜牧研究院广西南宁530007 广西河池市技术开发中心广西河池547000 广西河池市技术市场服务中心广西河池547000

为了运用网络药理学和分子对接技术分析车前草的药理活性及其防治畜禽腹泻的作用机制,本试验利用传统中药系统药理学分析平台(TCMSP)获得车前草的有效活性成分和靶点,利用Cytoscape 3.7.1软件构建车前草-活性成分-靶点网络;通过GeneCard... 详细信息

为了运用网络药理学和分子对接技术分析车前草的药理活性及其防治畜禽腹泻的作用机制,本试验利用传统中药系统药理学分析平台(TCMSP)获得车前草的有效活性成分和靶点,利用Cytoscape 3.7.1软件构建车前草-活性成分-靶点网络;通过GeneCards和OMIM数据库查询腹泻疾病靶点,提取药物与疾病交集靶点;通过STRING数据库对交集靶点进行蛋白质相互作用网络(PPI)分析,使用Cytoscape 3.7.1软件进行可视化处理绘制PPI图;利用DAVID数据库对靶点进行富集分析;通过分子对接技术对有效活性成分和关键靶点进行对接验证。结果显示,车前草活性成分有木犀草素、黄芩素、豆甾醇、高车前素、6-羟基木犀草素、谷甾醇和黄芩苷,可作用于α-丝氨酸/苏氨酸蛋白激酶(AKT1)、肿瘤蛋白P53(TP53)、肿瘤坏死因子(TNF)、半胱氨酸天冬氨酸蛋白酶-3(CASP3)、白细胞介素6(IL-6)、表皮生长因子受体(EGFR)、细胞周期蛋白D1(CCND1)和基质金属蛋白酶9(MMP9)等关键靶点;GO功能富集分析显示与生物过程相关的条目154条,与细胞组分相关的条目55条,与分子功能相关的条目105条;KEGG通路条目82条,主要参与调控癌症和磷脂酰肌醇-3激酶-丝氨酸/苏氨酸蛋白激酶(PI3K-AKT)信号通路;车前草的有效活性成分木犀草素和黄芩素与关键靶点AKT1可稳定结合。结果表明,车前草可以通过木犀草素、黄芩素、豆甾醇和高车前素等多种活性成分作用于AKT1、TP53、TNF、CASP3和IL-6等关键靶点上,通过参与多种癌症和PI3K-AKT信号通路的调控防治畜禽腹泻。

关键词：车前草腹泻网络药理学

LuoJiaAI:A cloud-based artificial intelligence platform for remote sensing image interpretation

在线全文

学校读者我要写书评

暂无评论

Geo-Spatial Information Science 2023年第2期26卷 218-241页

作者： Zhan Zhang Mi Zhang Jianya Gong xiangyun hu Hanjiang Xiong huan Zhou Zhipeng Cao State Key Laboratory of Information Engineering in Surveying Mapping and Remote SensingWuhan UniversityWuhanChina School of Remote Sensing and Information Engineering Wuhan UniversityWuhanChina Department of Land-Surveying and Geo-Informatics Hong Kong Polytechnic UniversityHong KongChina

The rapid processing,analysis,and mining of remote-sensing big data based on intelligent interpretation technology using remote-sensing cloud computing platforms(RS-CCPs)have recently become a new *** existing RS-CCPs mainly focus on developing and optimizing high-performance data storage and intelligent computing for common visual representation,which ignores remote sensing data characteristics such as large image size,large-scale change,multiple data channels,and geographic knowledge embedding,thus impairing computational efficiency and *** construct a LuoJiaAI platform composed of a standard large-scale sample database(LuoJiaSET)and a dedicated deep learning framework(LuoJiaNET)to achieve state-of-the-art performance on five typical remote sensing interpretation tasks,including scene classification,object detection,land-use classification,change detection,and multi-view 3D *** details of the LuoJiaAI application experiment can be found at the white paper for LuoJiaAI industrial *** addition,LuoJiaAI is an open-source RS-CCP that supports the latest Open Geospatial Consortium(OGC)standards for better developing and sharing Earth Artificial Intelligence(AI)algorithms and products on benchmark *** narrows the gap between the sample database and deep learning frameworks through a user-friendly data-framework collaboration mechanism,showing great potential in high-precision remote sensing mapping applications.

关键词： Artificial intelligence cloud computing platform remote-sensing intelligent interpretation sample database deep learning framework

A review on developments in the electrical structure of craton lithosphere

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China Earth Sciences 2020年第11期63卷 1661-1677页

作者： xiangyun hu Wule LIN Wencai YANG Bo YANG hubei Subsurface Multiscale Imaging Laboratory Institute of Geophysics and GeomaticsChina University of GeosciencesWuhan 430074China School of Earth Sciences Zhejiang UniversityHangzhou 310058China

Cratons have a long history of *** this paper,applications of the magnetotelluric method used in the study of craton lithosphere over the past 30 years were reviewed,examining case studies of cratons in North America,South America,Asia,Australia,and *** nuclei of the Archean cratons,for example the Kalahari Craton and Rae Craton,are usually characterized by thick and highly resistive lithospheric *** or after the formation of the cratons,tectonothermal events,such as collision,mantle plume,and asthenosphere upwelling led to the formation of high-conductivity zones in the craton lithosphere,which could be attributed to the increased hydrogen content(of nominally anhydrous minerals),higher iron content,and formation of graphite films or sulfides along the grain boundary of *** conductive zones are characterized by resistivity discontinuities in craton *** particular,the conductive zones include(1)large-scale lithospheric mantle conductors beneath the Slave Craton,Gawler Craton,and central part of North China Craton(Trans-North China Orogen);(2)near-vertical high-conductivity zone associated with the fossil subduction zone beneath the Dharwar Craton and Slave Craton;and(3)regional lateral electrical discontinuities,such as a conductive anomaly under the Bushveld Complex of the Kaapvaal *** eMoho refers to the electrical discontinuity in the crust-mantle *** existing research,this has been detected under the condition of extremely high lithospheric resistivity with only a slight decrease in the lower crust,and in the case of a very thin conductive lower crust or the lack *** the resistivity model,the unique"mushroom-like"lower crust-lithosphere mantle conductor and very thin lower crust layer of the North China Craton may represent lithosphere destruction and/or *** also find that some of the cratons are still not well ***,extensive three-dimensional inversion and joint interpr

关键词： Craton Lithospheric electrical structure Magnetotellurics

“京粉6号”蛋鸡在广西柳州地区的生产性能及适应性研究

在线全文

学校读者我要写书评

暂无评论

广西农学报 2024年第1期39卷 33-40页

作者：唐丹萍李红琴宣泽义胡湘云曹艳红柳州市柳南区现代农业产业服务中心广西柳州545007 柳州市宏华禽蛋养殖有限公司广西柳州545007 广西农业职业技术大学广西南宁530001

【目的】旨在探究“京粉6号”蛋鸡在以广西柳州市柳南区为代表的南方地区饲养的生产性能及适应性。【方法】引进“京粉6号”蛋鸡在柳州市柳南区进行养殖试验,对其成活率、体重、平均日耗料、产蛋等性能进行观测。【结果】(1)成活率:育... 详细信息

【目的】旨在探究“京粉6号”蛋鸡在以广西柳州市柳南区为代表的南方地区饲养的生产性能及适应性。【方法】引进“京粉6号”蛋鸡在柳州市柳南区进行养殖试验,对其成活率、体重、平均日耗料、产蛋等性能进行观测。【结果】(1)成活率:育雏期成活率97.1%,育成期成活率99.7%,产蛋期成活率91.1%。(2)体重:72周龄体重1735 g,80周龄体重1780 g。(3)平均日耗料:19~72周龄平均日耗料116.65 g/羽,19~80周龄平均日耗料116.78 g/羽。(4)产蛋情况:开产日龄140 d,19~72周龄饲养日产蛋数330个、产蛋总重量19.2 kg、平均蛋重58.15 g;19~80周龄饲养日产蛋数376个、产蛋总重量21.85 kg、平均蛋重58.13 g,产蛋率在90%以上的时长46周。以上指标除产蛋期成活率外均接近或优于饲养标准。【结论】结果表明,“京粉6号”蛋鸡适合在柳州市饲养。研究为该蛋鸡在南方地区推广养殖提供了依据。

关键词： “京粉6号”蛋鸡生产性能适应性

维普期刊数据库博看期刊

A Goal-Oriented Adaptive Finite Element Method for 3D Resistivity Modeling Using Dual-Error Weighting Approach

在线全文

学校读者我要写书评

暂无评论

Journal of Earth Science 2015年第6期26卷 821-826页

作者： Yixin Ye xiangyun hu Dong Xu Fundamental Science on Radioactive Geology and Exploration Technology Laboratory East China Institute of Technology hubei Subsurface Multi-scale Imaging Lab China University of Geosciences

A goal-oriented adaptive finite element（FE） method for solving 3D direct current（DC） resistivity modeling problem is presented. The model domain is subdivided into unstructured tetrahedral elements that allow for efficient local mesh refinement and flexible description of complex models. The elements that affect the solution at each receiver location are adaptively refined according to a goal-oriented posteriori error estimator using dual-error weighting approach. The FE method with adapting mesh can easily handle such structures at almost any level of complexity. The method is demonstrated on two synthetic resistivity models with analytical solutions and available results from integral equation method, so the errors can be quantified. The applicability of the numerical method is illustrated on a resistivity model with a topographic ridge. Numerical examples show that this method is flexible and accurate for geometrically complex situations.

关键词： adaptive finite element dual-error weighting approach unstructured mesh 3D resistivity.