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浏览/检索结果: 共51条，第1-10条 帮助

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Intermediate-mass black holes: finding of episodic, large-scale, and powerful jet activity in a dwarf galaxy 期刊论文  OAI收割
Monthly Notices of the Royal Astronomical Society, 2023, 卷号: 520, 期号: 4, 页码: 5964-5973
作者:  Yang, Jun;  Paragi, Zsolt;  Frey, Sandor;  Gurvits, Leonid, I;  Liao, Mai
  |  收藏  |  浏览/下载：6/0  |  提交时间：2024/06/23
RF spectrum measurement of the versatile microcavity soliton combs 会议论文  OAI收割
Nantong, China, 2021-10-10
作者:  Hu, Hao;  Wang, Ruolan;  Chen, Liao;  Wang, Weiqiang;  Zhang, Chi
  |  收藏  |  浏览/下载：32/0  |  提交时间：2022/01/27
Applications of differential barometric altimeter in ground cellular communication positioning network 期刊论文  OAI收割
IET SCIENCE MEASUREMENT & TECHNOLOGY, 2020, 卷号: 14, 期号: 3, 页码: 322-331
作者:  Hu, Zhengqun;  Zhang, Lirong;  Ji, Yuanfa
  |  收藏  |  浏览/下载：30/0  |  提交时间：2021/12/06
cellular radio  height measurement  measurement errors  Global Positioning System  altimeters  barometers  least squares approximations  Kalman filters  surface fitting  spread spectrum communication  compensation  matrix algebra  GPS  signal message structure  power spectrum  spread spectrum ranging signal  fitting parameters  least-square solution  calibration compensation  system noise variance matrix  measurement noise variance matrix  multibase station correction  height information correction calculation  DBA system  systematic performance  differential barometric altimeter  ground cellular communication positioning network  measurement datum distribution  altitude positioning error  Global Positioning System  differential barometric altimetry system  systematic implementation level  continuous altitude measurement  precise altitude measurement  DBA systematic implementation aspect  two dimensional curved surface fitting function  sensor measurement correction  filtering effect  Kalman filter  measuring station  multiBSs  navigation fusion  
Perceiving Beijing & x2019;s & x201C;City Image & x201D; Across Different Groups Based on Geotagged Social Media Data 期刊论文  OAI收割
IEEE ACCESS, 2020, 卷号: 8, 页码: 93868-93881
作者:  Peng, Xia;  Bao, Yi;  Huang, Zhou
  |  收藏  |  浏览/下载：22/0  |  提交时间：2021/07/09
A Noise Reduction Method for Solar Radio Spectrum Based on Improved Guided Filter and Morphological Cascade 会议论文  OAI收割
Kunming, China, 2019-07-20
作者:  Luo, Gaifang;  Yuan, Guowu;  Li, Guoliang;  Wu, Hao;  Dong L(董亮)
  |  收藏  |  浏览/下载：37/0  |  提交时间：2020/04/21
Clustering Algorithm-Based Data Fusion Scheme for Robust Cooperative Spectrum Sensing 期刊论文  OAI收割
IEEE ACCESS, 2020, 卷号: 8, 页码: 5777-5786
作者:  Zhang, Shunchao;  Wang, Yonghua;  Wan, Pin;  Zhuang, Jiawei;  Zhang, Yongwei
  |  收藏  |  浏览/下载：36/0  |  提交时间：2020/06/02
Perceiving Beijing & x2019;s & x201C;City Image & x201D; Across Different Groups Based on Geotagged Social Media Data 期刊论文  OAI收割
IEEE ACCESS, 2020, 卷号: 8, 页码: 93868-93881
作者:  Peng, Xia;  Bao, Yi;  Huang, Zhou
  |  收藏  |  浏览/下载：23/0  |  提交时间：2021/07/09
Constraining the X-Ray-Infrared Spectral Index of Second-timescale Flares from SGR 1935+2154 with Palomar Gattini-IR 期刊论文  OAI收割
The Astrophysical Journal, 2020, 卷号: 901, 页码: L7
作者:  HXMT
  |  收藏  |  浏览/下载：33/0  |  提交时间：2022/02/08
Radio transient sources  Magnetars  Soft gamma-ray repeaters  2008  992  1471  Astrophysics - High Energy Astrophysical Phenomena  Astrophysics - Instrumentation and Methods for Astrophysics  Abstract: The Galactic magnetar SGR 1935+2154 has been reported to produce the first example of a bright millisecond-duration radio burst (FRB 200428) similar to the cosmological population of fast radio bursts (FRBs). The detection of a coincident bright X-ray burst represents the first observed multiwavelength counterpart of an FRB. However, the search for similar emission at optical wavelengths has been hampered by the high inferred extinction on the line of sight. Here, we present results from the first search for second-timescale emission from the source at near-infrared (NIR) wavelengths using the Palomar Gattini-IR observing system in the J band, enabled by a novel detector readout mode that allows short exposure times of ?0.84 s with 99.9% observing efficiency. With a total observing time of ?12 hr (?47,728 images) during its 2020 outburst, we place median 3Ҡlimits on the second-timescale NIR fluence of ?18 Jy ms (13.1 AB mag). The corresponding extinction-corrected limit is ?125 Jy ms for an estimated extinction of AJ = 2.0 mag. Our observations were sensitive enough to easily detect an NIR counterpart of FRB 200428 if the NIR emission falls on the same power law as observed across its radio to X-ray spectrum. We report nondetection limits from epochs of four simultaneous X-ray bursts detected by the Insight-HXMT and NuSTAR telescopes during our observations. These limits provide the most stringent constraints to date on fluence of flares at 1014 Hz, and constrain the fluence ratio of the NIR emission to coincident X-ray bursts to RNIR ? 0.025 (fluence index ?0.35).  
Compressive Subspace Learning With Antenna Cross-Correlations for Wideband Spectrum Sensing 期刊论文  OAI收割
IEEE TRANSACTIONS ON COMMUNICATIONS, 2020, 卷号: 68, 期号: 9, 页码: 5406-5419
作者:  Gong TR(宫铁瑞);  Yang ZJ(杨志家);  Zheng M(郑萌);  Liu ZF(刘志峰);  Wang GS(王庚善)
  |  收藏  |  浏览/下载：35/0  |  提交时间：2020/10/10
Multiple-Antenna Cooperative Spectrum Sensing Based on the Wavelet Transform and Gaussian Mixture Model 期刊论文  OAI收割
SENSORS, 2019, 卷号: 19, 期号: 18, 页码: 18
作者:  Zhang, Shunchao;  Wang, Yonghua;  Yuan, Hantao;  Wan, Pin;  Zhang, Yongwei
  |  收藏  |  浏览/下载：235/0  |  提交时间：2019/12/16