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• 地理科学与资源研究所 [3]
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• OAI收割 [13]

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• 期刊论文 [7]
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• 2023 [1]
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浏览/检索结果: 共13条，第1-10条 帮助 条数/页： 5101520253035404550556065707580859095100 排序方式： 请选择题名升序题名降序提交时间升序提交时间降序作者升序作者降序发表日期升序发表日期降序 Deep reticulation: the long legacy of hybridization in vascular plant evolution 期刊论文  OAI收割 PLANT JOURNAL, 2023, 卷号: 114, 期号: 4, 页码: 743-766 作者:  Stull,Gregory W.;  Pham,Kasey K.;  Soltis,Pamela S.;  Soltis,Douglas E.   |  收藏  |  浏览/下载：27/0  |  提交时间：2024/07/10 ancient hybridization  gene flow  phylogenomics  polyploidy  reticulation  vascular plants  CHLOROPLAST DNA  GENE FLOW  HYBRID SPECIATION  ANGIOSPERM DIVERSIFICATION  NATURAL HYBRIDIZATION  PHYLOGENETIC ANALYSES  SEED PLANTS  WHITE OAKS  SCALE DATA  POLYPLOIDY   On the Terrestrial Gamma Ray Flashes Preceding Narrow Bipolar Events 期刊论文  OAI收割 Geophysical Research Letters, 2021, 卷号: 48, 页码: e92160 作者:  HXMT   |  收藏  |  浏览/下载：28/0  |  提交时间：2022/02/08 low frequency magnetic sferics  narrow bipolar events (NBEs)  relativistic feedback mechanism  Terrestrial Gamma ray Flashes (TGFs)  Abstract: Narrow bipolar events (NBEs) are occasionally reported to occur within a few ms after Terrestrial Gamma ray Flashes (TGFs), while the formation mechanism remains mysterious partially due to the lack of sufficient observations. Here, nine more TGFs of this scenario are reported with concurrent LF sferics and lightning location data. The gamma ray production in these TGFs preceded the occurrence of NBEs by a minimum of 60 µs up to 13.5 ms, and no other fast leader discharge was found within 20 ms before the TGF. The TGF preceded positive NBEs occurred at altitudes of 8.6-11 km in thunderstorms, likely in the high electric field (E field) region of lightning initiation. The analyses show that the NBE preceding TGFs bear harder energy spectrum with larger proportion of high energy photons than EIP related TGFs produced in association with lightning leader. Our findings support the relativistic feedback mechanism of gamma ray generation in the large scale thunderstorm E field.   Parallel ddRAD and Genome Skimming Analyses Reveal a Radiative and Reticulate Evolutionary History of the Temperate Bamboos 期刊论文  OAI收割 SYSTEMATIC BIOLOGY, 2021, 卷号: 70, 期号: 4, 页码: 756-773 作者:  Guo,Cen;  Ma,Peng-Fei;  Yang,Guo-Qian;  Ye,Xia-Ying;  Guo,Ying   |  收藏  |  浏览/下载：79/0  |  提交时间：2022/04/02 Arundinarieae  ddRAD  paleopolyploid  genome skimming  rapid diversification  incongruence  ARUNDINARIEAE POACEAE BAMBUSOIDEAE  SOUTH CHINA SEA  WOODY BAMBOOS  PHYLOGENOMIC ANALYSES  ADAPTIVE RADIATION  ECOLOGICAL OPPORTUNITY  PLANT DIVERSIFICATION  ASIAN MONSOON  RADSEQ DATA  GENE TREES   The use of R in photosynthesis research 期刊论文  OAI收割 FUNCTIONAL PLANT BIOLOGY, 2021 作者:  Liu, Yasi;  Wang, Xiangping;  Fan, Dayong;  Lai, Jiangshan   |  收藏  |  浏览/下载：22/0  |  提交时间：2023/02/24 ape  code  data analyses  lme4  multcomp  nlme  open-source  plantecophys  popularity  R language  R packages   Statistical and probabilistic analyses of impact pressure and discharge of debris flow from 139 events during 1961 and 2000 at Jiangjia Ravine, China 期刊论文  OAI收割 ENGINEERING GEOLOGY, 2015, 卷号: 187, 页码: 122-134 作者:  Hong, Y.;  Wang, J. P.;  Li, D. Q.;  Cao, Z. J.;  Ng, C. W. W. 收藏  |  浏览/下载：27/0  |  提交时间：2015/06/15 Statistical and probabilistic analyses  Gaussian copula approach  Debris flow  Field data  Impact pressure  Discharge   Seismic imaging studies of complex high and steep structures in Kuqa depression 期刊论文  OAI收割 CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION, 2013, 卷号: 56, 期号: 6, 页码: 1985-2001 作者:  Fu Li-Yun;  Xiao You-Jun;  Sun Wei-Jia;  Wu Chao;  Guan Xi-Zhu   |  收藏  |  浏览/下载：16/0  |  提交时间：2017/12/22 Complex High And Steep Structures In Kuqa Depression  Subtle Preprocessing Of Prestack Data  Three-stage Migration Velocity Analyses  Degenerate Fourier Migrator  Prestack Time And Depth Migrations   Targeting Mineral Resources with Remote Sensing and Field Data in the Xiemisitai Area, West Junggar, Xinjiang, China SCI/SSCI论文  OAI收割 2013 作者:  Liu L.;  Zhou J.;  Jiang D.;  Zhuang D. F.;  Mansaray L. R.   |  收藏  |  浏览/下载：21/0  |  提交时间：2014/12/24 West Junggar  Etm  Quickbird  Principal Component Analyses  Hsi Color  Model  Crosta Technique  Spaceborne Thermal Emission  Reflection Radiometer Aster  Thematic  Mapper Data  Crosta Technique  Etm++ Data  Discrimination  Egypt  Zones  Rocks  Belt   Trends and Multifractal Analyses of Precipitation Data from Shandong Peninsula, China 期刊论文  OAI收割 American Journal of Environmental Sciences, 2012, 卷号: 8, 期号: 3, 页码: 271-279 Meng Gao; Xiyong Hou 收藏  |  浏览/下载：26/0  |  提交时间：2013/03/08 Precipitation data series  piecewise regression  fractal dimension  climate change  shandong peninsula  multifractal analyses  intervention analysis  linear regression   Decomposition Analysis of the Mechanism Behind the Spatial and Temporal Patterns of Changes in Carbon Bio-Sequestration in China SCI/SSCI论文  OAI收割 2012 Zhan J. Y.; Yan H. M.; Chen B.; Luo J.; Shi N. N. 收藏  |  浏览/下载：20/0  |  提交时间：2012/09/04 carbon bio-sequestration  decomposition analyses  panel data model  China  ecosystem productivity  urban land  variability  cycle  npp  expansion  growth  waste  cover   Design of motion compensation mechanism of satellite remote sensing camera (EI CONFERENCE) 会议论文  OAI收割 International Symposium on Photoelectronic Detection and Imaging 2011: Space Exploration Technologies and Applications, May 24, 2011 - May 26, 2011, Beijing, China Gu S.; Yan Y.; Xu K.; Jin G. 收藏  |  浏览/下载：47/0  |  提交时间：2013/03/25 With the development of aerospace remote sensing technology  the ground resolution of remote sensing camera enhances continuously. Since there is relative motion between camera and ground target when taking pictures  the target image recorded in recording media is moved and blurred. In order to enhance the imaging quality and resolution of the camera  the image motion had to be compensated. In order to abate the effect of image motion to image quality of space camera and improve the resolution of the camera  the compensation method of image motion to space camera is researched. First  the reason of producing drift angle and adjustment principle are analyzed in this paper. This paper introduce the composition and transmission principle of image motion compensation mechanism. Second  the system adopts 80C31 as controller of drift angle  and adopts stepping motor for actuators  and adopts absolute photoelectric encoder as the drift Angle measuring element. Then the control mathematical model of the image motion compensation mechanism are deduced  and it achieve the closed-loop control of the drift angle position. At the last  this paper analyses the transmission precision of the mechanism. Through the experiment  we measured the actual precision of the image motion compensation mechanism  and compared with the theoretical analysis. There are two major contributions in this paper. First  the traditional image motion compensation mechanism is big volume and quality heavy. This has not fit for the development trend of space camera miniaturization and lightweight. But if reduce the volume and quality of mechanism  it will bring adverse effects for the precision and stiffness of mechanism. For this problem  This paper designed a image motion compensation that have some advantages such as small size  light weight at the same time  high precision  stiffness and so on. This image motion compensation can be applicable to the small optics cameras with high resolution. Second  the traditional mechanism control need to corrected  fitting and iterative for the control formula of mechanism. Only in this way  we can get the optimal control mathematical model. This paper has high precision of the control formula derived. It can achieve the high precision control without fitting  It also simplify the difficulty of control mathematical model establishment. This paper designed the range of adjusting of image motion compensation mechanism between -5 +5. Based on choosing-5  -4  -3  -2  -1  0  +1  +2  +3  +4  +4 as the expectation value of the imaginary drift angle  we get ten groups of the fact data in adjusting drift angle measured. The test results show that the precision of the drift angle control system can be achieved in 1. It can meet the system requirements that the precision of the control system is less than 3'  and it can achieve the high-precision image motion compensation. 2011 SPIE.