检索结果-南通市图书馆

Target localization based on cross-view matching between UAV and satellite

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2022年第9期35卷 333-341页

作者： Kan REN Lei DING Minjie WAN guohua gu Qian CHEN Jiangsu Key Laboratory of Spectral Imaging and Intelligent Sense Nanjing University of Science and TechnologyNanjing 210094China

Matching remote sensing images taken by an unmanned aerial vehicle(UAV) with satellite remote sensing images with geolocation information. Thus, the specific geographic location of the target object captured by the UAV is determined. Its main challenge is the considerable differences in the visual content of remote sensing images acquired by satellites and UAVs, such as dramatic changes in viewpoint, unknown orientations, etc. Much of the previous work has focused on image matching of homologous data. To overcome the difficulties caused by the difference between these two data modes and maintain robustness in visual positioning, a quality-aware template matching method based on scale-adaptive deep convolutional features is proposed by deeply mining their common features. The template size feature map and the reference image feature map are first obtained. The two feature maps obtained are used to measure the similarity. Finally, a heat map representing the probability of matching is generated to determine the best match in the reference image. The method is applied to the latest UAV-based geolocation dataset(University-1652 dataset) and the real-scene campus data we collected with UAVs. The experimental results demonstrate the effectiveness and superiority of the method.

关键词： Cross-view image matching Satellite Target localization Template matching Unmanned Aerial Vehicle(UAV)

Bioleaching behavior and surface property of pyrites in different metallogenic conditions

在线全文

学校读者我要写书评

暂无评论

Chinese Journal Of Geochemistry 2014年第3期33卷 256-261页

作者： ZHANG Xun gu guohua HU Keting WANG Chongqing School of Resources Processing and Bioengineering Central South University China Nerin Engineering Co. Ltd. School of Chemistry and Chemical Engineering Central South University

The bioleaching behaviors and surface properties of pyrites in two metallogenic conditions by Sulfobacillus thermosulfidooxidans were investigated by adsorption tests, zeta-potential measurements and bioleaching experiments. It is found that there were significant differences in the microorganism adsorption capacity, electrokinetic properties and bioleaching behaviors for the two pyrites. The S. thermosulfidooxidans adsorption capacity on high temperature hydrothermal(hy_high_temp) pyrite is larger than that on sendimentary coal(sed_coal) pyrite. It may be that more extracellular polymeric substances(EPS) is produced when it is difficult for microorganism to make use of hy_high_temp pyrite as source of energy, and get leaching bacteria attached to pyrite by means of EPS. The zeta-potential measurements indicated that zeta-potential value of hy_high_temp pyrite was higher than that of sed_coal pyrite in pH range of 2–10. After interacting with cells, the IEP(Iso-Electric Point) of hy_high_temp pyrite shifted obviously to that of bacterial. In contrast, the IEP of sed_coal pyrite remained unchanged nearly. The bioleaching results showed that hy_high_temp pyrite did not dissolve and the leaching extent was only 0.82%, while that of sed_coal pyrite was 34.59%. Attempts were taken to illustrate the remarkable difference between bioleaching results of two pyrites from a semiconductor energy band theory perspective.

关键词：浸出行为生物浸出黄铁矿表面性质成矿细胞外聚合物微生物利用吸附试验

Horizontal crustal movement before the great Wenchuan earthquake obtained from GPS observations in the regional network

在线全文

学校读者我要写书评

暂无评论

Earthquake Science 2009年第5期22卷 471-478页

作者： guohua gu Wuxing Wang Yueren Xu Wenjun Li Institute of Earthquake Science China Earthquake Administration Beijing 100036 China

The great Wenchuan earthquake of M8.0 on May 12, 2008, occurred in an area with dense GPS observation stations in the regional network of the Crustal Movement Observation Network of China （CMONOC）. Non-continuous observations were carried out at the 1 000 GPS stations of the regional network in 1999, 2001, 2004 and 2007. The horizontal displacements at GPS stations in the regional network before the Wenchuan earthquake show that the main driving tectonic force of the earthquake was the northward pushing of the Indian plate, added at the same time by the pushing of plates on the east and south. In comparison to the displacements in other regions, the horizontal displacements near and around the seismic area is characterized by diverging eastward displacements, that is, the stations to the north of the epicenter moved in the ENE direction while those to the south of epicenter moved in ESE direction with smaller displacements at stations near the epicenter. The accuracy of the estimated strain results is briefly discussed. In order to obtain the anomalous information before the earthquake, the methods of both best fits by trend surface and statistics have been used in the study for finding the future epicentral area from the strain accumulations in the regional network observed from 1999 to 2007 before the Wenchuan earthquake. Besides the epicentral area of the western Kunlun mountain pass earthquake of M8.1 in 2001, the results of best fits by trend surfaces of the strain accumulations from 1999 to 2007 in the regional network show that the Wenchuan earthquake occurred at the eastern fringe of a large area with relatively large accumulations of the first shear strains and also at the northeastern fringe of a smaller area with significant accumulated areal compressions. The statistics of the accumulations of the strain components demonstrates that they also showed anomalous distribution pattems in this area and its neighborhood with increasing accumulations of both she

关键词： Wenchuan earthquake horizontal crustal movement strain accumulation GPS earthquake prediction

Pre-seismic and Co-seismic Crustal Movements of the M 7.3 Kyushu Earthquake on April 16,2016 in Japan

在线全文

学校读者我要写书评

暂无评论

Earthquake Research in China 2017年第4期31卷 589-600页

作者： gu guohua Wang Wuxing Institute of Earthquake Science China Earthquake AdministrationBeijing 100036China

The time series of coordinates of a large number of GPS stations in the world,processed by Prof. Geoffrey Blewitt with GIPSY software are available at http://geodesy. unr. *** on the time series of coordinates in the global reference frame of IGS08 at more than250 stations of continuous GPS observations,downloaded from the website,the co-seismic displacements of the M7. 3 Kyushu earthquake on April 16,2016 in Japan and the preseismic strain accumulations and displacements in the regional reference frame were obtained. The station of continuous GPS observation at BJFS near Beijing has been quite stable in displacement in the eastern part of China for more than 17 years since the beginning of its operation,and this station is used as the core station in the regional reference frame for the pre-seismic displacement of the Kyushu earthquake of M7. 3. The main feature of the pre-seismic displacements of the Kyushu earthquake is characterized by locking in the crust at and near the epicenter. The anomalous pre-seismic strain accumulation developed in an area of anomalous accumulation of the shear strain component of γ1 on the northeast side of the epicenter,with increasing size of the area and increasing magnitude in γ1. The largest area covered by the anomalous γ1 is about 2000 km2. The change in the E component at BJFS since November 26,2015 was caused by the replacement of the receiver and the antenna at the station. In order to study the shortterm change in displacements at stations at and near the epicenter,the time series at 3 stations with continuous GPS observations,2 at SUWN and DAEJ in south Korea and 1 at BJSH near Beijing were analyzed. The analysis shows that the displacements at the 3 stations have been quite stable in the same manner in east Asia. Thus,BJSH is used as the core station in the regional reference frame of displacement and the displacement time series show that there were no significant short term anomalies before the earthquake.

关键词： GPS GNSS co-seismic displacement 2016M7.3 Kyushu earthquake in Japan Earthquake precursor Earthquake prediction

Coupling Analysis of Moment of Inertia & Dynamic on Optoelectronic Tracking Turntable

在线全文

学校读者我要写书评

暂无评论

仪器仪表学报 2013年第S1期34卷 214-218页

作者： Xu Xiaoming Liu Shuli gu guohua New Star Research Inst.of Applied Tech

With photoelectric tracking system as the research object,based on the theorem of moment of momentum and Euler dynamic equation,Nonlinear biaxial coupling dynamic model of tracking turntable is *** of moment of inertia coupling,speed coupling and the dynamic coupling between tracking turntable shafts were studied,the analytical relation between them was given in *** the change trend of theoretical *** it provides the theory reference and model base,for the future design of the high precision tracking controller And control parameter selection and *** the end,specific measures are made for structure optimization.

关键词： Opto-electronic tracking turntable moment of inertia dynamics coupling modeling

Bio-leaching effects of Leptospirillum ferriphilum on the surface chemical properties of pyrite

在线全文

学校读者我要写书评

暂无评论

Mining Science and Technology 2010年第2期20卷 286-291页

作者： gu, guohua SU, Lijun CHEN, Minglian SUN, Xiaojun ZHOU, Hongbo school of mineral processing and bioengineering central south universitychangsha 410083china

Leptospirillum ferriphilum cultured using different energy sources(either soluble ferrous ion or pyrite) changed the surface properties of *** adsorption,zeta-potential,hydrophobicty,FT-IR spectra and surface morphology were *** of bacterial cells to the pyrite surface is a fast ***,the adsorption of cells grown in pyrite is greater than of cells grown in soluble ferrous *** Iso-Electric Point(IEP) of pyrite treated with *** approaches that of the cells *** contact angle of the pyrite surface was observed to decrease due to the surface formation of some hydrophilic substances during *** in pyrite surface properties after bacterial treatment support the idea that ferric ion plays an important role and that indirect bio-oxidation is the principal mechanism of pyrite bio-leaching.

关键词： Leptospirillum ferriphilum pyrite adsorption bio-leaching surface properties

Genetic analysis and gene fine mapping for a rice novel mutant(rl_(9(t)))with rolling leaf character

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2006年第1期51卷 63-69页

作者： YAN Changjie YAN Song ZHANG Zhengqiu LIANG guohua LU Jufei gu Minghong Jiangsu Key Laboratory of Plant Functional Genomics/Jiangsu Key Laboratory for Crop Genetics and Physiology Yangzhou University Yangzhou 225009 China

Leaf shape is an important parameter for ideotype breeding in rice, and the rolling of leaf is also beneficial to efficient ripening of grains. This encourages the explorations of new genes that regulate leaf shape. In this study, genetic analysis and gene mapping were carried out for a novel rolling leaf mutant identified from japonica variety Zhonghua 11. The SSR marker analysis showed that the mutant was controlled by a single recessive gene (rl9(t)) lo- cated on chromosome 9. Fine mapping of the Rl9(t) locus was conducted with 30 new STS markers de- veloped around Rl9(t) anchored region based on the sequence diversity between Nipponbare and 93-11. The fine mapping necessitated the contruction of a PAC contig encompassing the Rl9(t) locus, which was delimited to a 42 kb region. This could therefore en- hance the cloning of the target gene in further stud- ies.

关键词：水稻遗传分析分子标记基因工程

Development and characterization of interspecific hybrids between Oryza sativa and O. latifolia by in situ hybridization

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2008年第19期53卷 2973-2980页

作者： YI ChuanDeng TANG ShuZhu ZHOU Yong LIANG guohua GONG ZhiYun gu MingHong Jiangsu Province Key Laboraty of Crop Genetics and Physiology/Key Laboraty of Plant Functional Genomics of Ministry of Education Yangzhou University Yangzhou 225009 China

Oryza sativa and O. latifolia belong to the AA and CCDD genomes of Oryza, respectively. In this study, interspecific hybrids of these species were obtained using the embryo rescue technique. Hybrid panicle traits, such as long awns, small grain, exoteric large purple stigma, grain shattering and dispersed panicles, resemble that of the paternal parent, O. latifolia, whereas there is obvious heterosis in such respects as plant height, tillering ability and vegetative vigor. Chromosome pairing and the genomic components of the hybrid were subsequently investigated using genomic in situ hybridization (GISH) and fluorescent in situ hybridization (FISH) analysis. Based on the mitotic metaphase chromosome numbers of the root tips investigated, the hybrid is a triploid with 36 chromosomes. The genomic constitution of the hybrid is ACD. In the meiotic metaphase I of the hybrid pollen mother cell, poor chro- mosome pairing was identified and most of the chromosomes were univalent, which resulted in com- plete male sterility in the hybrid.

关键词：漂白亚麻纤维卷胚芽种间杂交技术

Far-field crustal movements before and after the 2011 Ms9.0 Japan earthquake from GPS observations

在线全文

学校读者我要写书评

暂无评论

Geodesy and Geodynamics 2011年第3期2卷 1-7页

作者： gu guohua Wang Wuxing Institute of Earthquake Science China Earthquake Administration Beijing 100036 China

The paper gives an analysis of the displacement time series before and after the March 11,2011 Ms9.0 east Japan earthquake and co-seismic displacements observed at continuous GPS stations in and around China. The results showed a broad-scaled related elastic-rebound process and some premonitory horizontal crustal movements to this earthquake over this vast area.

关键词： Japan earthquake crustal movement GPS earthquake prediction co-seismic displacement