检索结果-南通市图书馆

Architecture and application of integrated spatial information service platform for digital mine

在线全文

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 2011年第S3期21卷 706-711页

作者： zhang Jin1, XIAO Jie2.1. College of Mining, Taiyuan University of Technology, Taiyuan 03002., china 2. {2. of geodesy and geophysics, chinese academy of sciences, wuhan 430077, china Taiyuan Univ Technol Coll Min Taiyuan 030024 Peoples R China chinese Acad Sci Inst Geodesy & Geophys Wuhan 430077 Peoples R China

Using enterprise GIS platform, spatial databases and modern information technology, building geo-spatial information service platform of digital mine which has the features of the data exchange service, enterprise GIS services, directory services, logging services, is key technology and application infrastructure for digital mine. Based on the support of geospatial information service platform of digital mine, the professional GIS application service adapter can be developed and the application supports related to mining application system can be realized. Using high-resolution satellite remote sensing data, the mine functional partition map and geographic grids can be divided, and the geographic grid parts, status and events of important features of the surface object were investigated and defined. The system architecture and technical characteristics of integrated spatial information service platform were analyzed firstly, which guarantee service ability of digital mine. The methods and applications of functional partition map for integrated management service platform were discussed which are the services scheme of digital mine. The application results indicated that digital mine upgrades and enhances the capability and range of mine surveying and mapping, and is of great significance for guarantee of efficient, green and intensive exploitation of mine.

关键词： platform architecture web services application services digital mine

Determination of vertical gradient of gravity anomaly with topographic data

在线全文

学校读者我要写书评

暂无评论

chinese Science Bulletin 1999年第11期44卷 1029-1034页

作者： zhang Chijuninstitute of {2. and geophysics , chinese academy of sciences , wuhan 430077 , china institute of geodesy and {2. Chinese Academy of Sciences Wuhan China

The role of vertical gradient of gravity anomaly in the solution and interpretation of geological and geophysical problems on superficial layer is increasingly evident. However, it is difficult to directly observe the vertical gradient of gravity anomaly in mountainous area. Moreover,aerial and satellite gravity gradient measurments have not been put into practice up to date *** vertical gradient of gravity anomaly is calculated by use of topographic data and several problems concerned are investigated and discussed. It turns out in theory and practice that the relative error of the vertical gradient determined with the method is only 5%, and when the vertical gradient of gravity anomaly reaches the maximum 1 000 ns-2./sup> the error is only 50 ns-2./sup>. In addition, how to divide ring zones in calculation and the errors caused by the inaccuracy of landform elevation and rock density has been quantitatively analysed.

关键词： vertical gradient gravity anomaly topographic mass geoid.

Determination of geoid and elevation of the Mt. Qomolangma and discussion on the role of vertical gravity gradient

在线全文

学校读者我要写书评

暂无评论

chinese Science Bulletin 1997年第20期42卷 1723-1725页

作者： zhang Chijuninstitute of {2. and geophysics, chinese academy of sciences, wuhan 430077, china institute of geodesy and {2. Chinese Academy of Sciences Wuhan 430077 China

IT is known that the Mt. Qomolangma is the highest peak in the world. It was recorded in the'Map of Complete Territory of the Qin Dynasty' (published in 1717). As the highest peak,the Mt. Qomolangma not only provokes the interest of climbers but also arouses much atten-tion of geodesists. A significant cause is that the Mt. Qomolangma is located in the collisionbelt between the Indian Plate and the Eurasian Plate. According to the relative

关键词： geoid orthometric height the Mt. Qomolangma.

The GPS-gravimetry boundary value problem

在线全文

学校读者我要写书评

暂无评论

Science china Earth sciences 2005年第3期48卷 398-405页

作者： YU Jinhai1,2.& zhang Chuanding2.1. institute of {2. and geophysics of chinese academy of sciences, wuhan 430077, china 2. Zhengzhou Information Engineering University, Zhengzhou 450052. china 1. institute of geodesy and {2. of chinese academy of sciences 430077 Wuhan China 2. Zhengzhou Information Engineering University 450052 Zhengzhou China

How to determine the earth’s external gravity field with the accuracy of O(T2. by making use of GPS data and gravity values measured on the earth’s surface is dealt with in this paper. There are two main steps: to extend these measured values on the earth’s surface onto the reference ellipsoid at first and then to seek for the integral solution of the external Neumann problem outside the ellipsoid. In addition, the corresponding judging criteria of accuracy to solve the GPS-gravity boundary value problem are established. The integral solution given in the paper not only contains all frequency-spectral information of the gravity field with the accuracy of O(T 2., but is also easily computed. In fact, the solution has great significance for both theory and prac- tice.

关键词： Neumann boundary value problem, integral solution, gravity disturbance.

Spectral analysis of quasi-stationary sea surface topography from GRACE mission

在线全文

学校读者我要写书评

暂无评论

Science china Earth sciences 2005年第11期48卷 2040-2048页

作者： zhang Zizhan1,2.& LU Yang1,3 1. institute of {2. and geophysics, chinese academy of sciences, wuhan 430077, china 2. Graduate School of the chinese academy of sciences, Beijing 100039, china 3. Unite Center for Astro-geodymics Research, chinese academy of sciences, Shanghai 2.0030, china 1. institute of geodesy and {2. Chinese Academy of Sciences 430077 Wuhan China 2. Graduate School of the chinese academy of sciences 100039 Beijing China 3. Unite Center for Astro-geodymics Research Chinese Academy of Sciences 200030 Shanghai China

During the last two decades satellite altimetry has offered an abundance of meas-urements of the sea surface resulting in the improvement of global mean sea surface height (MSSH) and marine geoid determination. On the other hand, with the launching of new genera-tion gravity satellites, some high accuracy long-wavelength gravity models are available. These breakthroughs give us a great opportunity for new estimation of quasi-stationary sea surface topography (QSST). In this paper, the new gravity model GGM01C derived from GRACE mission is briefly presented, and a new global high precision and high-resolution QSST is determined based on the GGM01C model and the global MSSH. The spectral features of the QSST esti-mated by GGM01C and EGM96 gravity model to degree/order 2.0 are discussed by spectral analysis. As a result, the QSST is mainly composed of long waves, medium waves partially and short waves scarcely, its power spectral structures are different between the zonal direction and the meridional direction, there are great differences between the two models, which maybe ex-plain why the ocean currents derived from the two gravity models by Tapley show different pat-terns.

关键词： quasi-stationary sea surface topography, mean sea surface height, GGM01, fast Fourier transform, spectral analysis

Interactions between hotspots and the Southwest Indian Ridge during the last 90 Ma:Implications on the formation of oceanic plateaus and intra-plate seamounts

在线全文

学校读者我要写书评

暂无评论

Science china Earth sciences 2011年第8期54卷 1177-1188页

作者： zhang tao 1,2.3,4,LIN Jian 5 & GAO JinYao 3,{2.,chinese academy of sciences,wuhan 430077,china 2.Graduate University of chinese academy of sciences,Beijing 100049,china 3 The Second institute of Oceanography,State Oceanic Administrator,Hangzhou 310012.china 4 Key Laboratory of Submarine Geosciences,State Oceanic Administrator,Hangzhou 310012.china 5 Department of Geology and {12.,Woods Hole Oceanographic Institution,Woods Hole,MA 02.43,USA 1. institute of geodesy and {2. Chinese Academy of Sciences Wuhan 430077 China2. Graduate University of Chinese Academy of Sciences Beijing 100049 China3. The Second Institute of Oceanography State Oceanic Administrator Hangzhou 310012 China4. Key Laboratory of Submarine Geosciences State Oceanic Administrator Hangzhou 310012 China

This study investigates the relationship between the hotspot-ridge interaction and the formation of oceanic plateaus and seamounts in the Southwest Indian *** first calculated the relative distance between the Southwest Indian Ridge (SWIR) and relevant hotspots on the basis of models of plate reconstruction,and then calculated the corresponding excess magmatic anomalies of the hotspots on the basis of residual bathymetry and Airy *** results reveal that the activities of the Marion hotspot can be divided into three main phases:interaction with the paleo-Rodrigues triple junction (73.6-68.5 Ma),interaction with the SWIR (68.5-42.7 Ma),and intra-plate volcanism (42.7-0 Ma).These three phases correspond to the formation of the eastern,central,and western parts of the Del Cano Rise,*** magnitude and apparent periodicity of the magmatic volume flux of the Marion hotspot appear to be dominated by the hotspot-ridge *** periodicity of the Marion hotspot is about 2. Ma,which is much longer than that of the Hawaii and Iceland hotspots (about 15 Ma).

关键词： Southwest Indian Ocean hotspot-ridge interaction magmatic volume flux oceanic plateaus seamounts

Deep Guided Attention Network for Joint Denoising and Demosaicing in Real Image

在线全文

学校读者我要写书评

暂无评论

chinese Journal of Electronics 2024年第1期33卷 303-312页

作者： tao zhang Ying FU Jun zhang School of Computer Science and Technology Beijing Institute of Technology Advanced Reasearch institute of Multidisciplinary Science Beijing Institute of Technology

Denoising(DN) and demosaicing(DM) are the first crucial stages in the image signal processing pipeline. Recently, researches pay more attention to solve DN and DM in a joint manner, which is an extremely undetermined inverse problem. Existing deep learning methods learn the desired prior on synthetic dataset, which limits the generalization of learned network to the real world data. Moreover, existing methods mainly focus on the raw data property of high green information sampling rate for DM, but occasionally exploit the high intensity and signalto-noise(SNR) of green channel. In this work, a deep guided attention network(DGAN) is presented for real image joint DN and DM(JDD), which considers both high SNR and high sampling rate of green information for DN and DM, respectively. To ease the training and fully exploit the data property of green channel, we first train DN and DM sub-networks sequentially and then learn them jointly, which can alleviate the error accumulation. Besides, in order to support the real image JDD, we collect paired raw clean RGB and noisy mosaic images to conduct a realistic dataset. The experimental results on real JDD dataset show the presented approach performs better than the state-of-the-art methods, in terms of both quantitative metrics and qualitative visualization.

关键词： Training Visualization Inverse problems Green products Noise reduction Pipelines Signal processing

Holder continuous weak solutions of the 2. Boussinesq equation with thermal diffusion

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science china Mathematics 2024年第8期67卷 1777-1806页

作者： Tianwen Luo tao tao Liqun {2. Yau Mathematical sciences Center Tsinghua UniversityBeijing 100084China School of Mathematics Shandong UniversityJinan 250100China institute of Mathematics Academy of Mathematics and Systems ScienceChinese Academy of SciencesBeijing 100190China School of Mathematical sciences University of Chinese Academy of SciencesBeijing 100049China

We show the existence of Holder continuous periodic weak solutions of the 2. Boussinesq equation with thermal diffusion which satisfy the prescribed kinetic *** precisely,for any smooth e(t):[0,1]→R+andε∈(0,110),there exist v∈C 110−ε([0,1]×T2.andθ∈C 1,12.−εt 2.C 2.1 x 10−ε([0,1]×T2.,which satisfy(1.1)in the sense of distribution and e(t)=ˆT2.v(t,x)|2.dx,∀t∈[0,1].

关键词： 2. Boussinesq equation with thermal diffusion Holder continuous periodic weak solutions prescribed kinetic energy

Surprised by exceptional stability of confined single-atom cluster catalysts

在线全文

学校读者我要写书评

暂无评论

Science china Materials 2024年第5期67卷 1676-1677页

作者： Aiqin Wang tao zhang Dalian institute of Chemical Physics Chinese Academy of SciencesDalian116023China

Single-atom catalysts(SACs)have recently grown as one of the most active frontiers in heterogeneous catalysis[1,2..Intensive research efforts have been invested towards exploring various SACs for thermocatalysis,electrocatalysis as well as photocatalysis,and in most cases,SACs exhibit superior activities and distinctive selectivities compared with the nanoparticle counterparts,thanks to the maximized atom utilization and isolated mononuclear active site *** spite of these merits.

关键词： structure catalysis exceptional