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Revealing the heterogeneity of periodic visiting patterns across different ages and spaces using a flexible detection method: A case study of Beijing 期刊论文  OAI收割
APPLIED GEOGRAPHY, 2024, 卷号: 168, 页码: 103315
作者:  Fang, Zidong;  Pei, Tao;  Song, Ci;  Yan, Xiaorui;  Liu, Le
  |  收藏  |  浏览/下载：17/0  |  提交时间：2024/08/22
Synchronous X-ray/Optical QPOs from the Black Hole LMXB MAXI J1820+070 期刊论文  OAI收割
Monthly Notices of the Royal Astronomical Society, 2021
作者:  HXMT
  |  收藏  |  浏览/下载：53/0  |  提交时间：2022/02/08
black hole physics  Low Mass X-ray Binaries  accretion  accretion  discs  stars: individual (MAXI J1820+070)  Astrophysics - High Energy  Astrophysical Phenomena  Abstract: We present high-speed optical photometry from SAAO and SALT on the black hole LMXB MAXI J1820+070 (ASSASN-18ey), some of it simultaneous with NICER, Swift and Insight-HXMT X-ray coverage. We detect optical Quasi-Periodic Oscillations (QPOs) that move to higher frequencies as the outburst progresses, tracking both the frequency and evolution of similar X-ray QPOs previously reported. Correlated X-ray/optical data reveal a complex pattern of lags, including an anti-correlation and a sub-second lag that evolve over the first few weeks of outburst. They also show correlated components separated by a lag equal to the QPO period roughly centered on zero lag, implying that the inter-band variability is strongly and consistently affected by these QPOs at a constant phase lag of roughly ±Ю The synchronisation of X-ray and optical QPOs indicates that they must be produced in regions physically very close to each other  we thus propose that they can be explained by a precessing jet model, based on analogies with V404 Cyg and MAXI J1348-630.  
Mining Evolution Patterns from Complex Trajectory Structures-A Case Study of Mesoscale Eddies in the South China Sea 期刊论文  OAI收割
ISPRS INTERNATIONAL JOURNAL OF GEO-INFORMATION, 2020, 卷号: 9, 期号: 7, 页码: 15
作者:  Wang, Huimeng;  Du, Yunyan;  Yi, Jiawei;  Wang, Nan;  Liang, Fuyuan
  |  收藏  |  浏览/下载：21/0  |  提交时间：2021/03/18
Mining Evolution Patterns from Complex Trajectory Structures-A Case Study of Mesoscale Eddies in the South China Sea 期刊论文  OAI收割
ISPRS INTERNATIONAL JOURNAL OF GEO-INFORMATION, 2020, 卷号: 9, 期号: 7, 页码: 15
作者:  Wang, Huimeng;  Du, Yunyan;  Yi, Jiawei;  Wang, Nan;  Liang, Fuyuan
  |  收藏  |  浏览/下载：16/0  |  提交时间：2021/03/18
Terahertz FSS for space borne passive remote sensing application 期刊论文  OAI收割
ELECTRONICS LETTERS, 2013, 卷号: 49, 期号: 22, 页码: 1398-1399
作者:  Xia, Bu Gang;  Zhang, De Hai;  Meng, Jin;  Huang, Jian;  Yao, Chang Fei
收藏  |  浏览/下载：54/0  |  提交时间：2014/05/04
aerospace instrumentation  antenna arrays  circular waveguides  electromagnetic wave polarisation  frequency selective surfaces  geophysical equipment  radiometers  receiving antennas  remote sensing  resonators  spatial filters  submillimetre wave devices  terahertz wave devices  terahertz metamaterials  frequency 0  1 THz to 0  5 THz  Earth observation radiometers  space-borne passive remote sensing application  scanning antenna  split ring resonator  subwavelength circular ring  micromachined metallic pattern  periodic aperture unit cells  ultra-thin high conductivity aluminium layer  quartz wafer  FSS array  incident angle variation  polarisation variation  high sensitivity receiver  spatial filtering front-end  terahertz FSS metamaterial  terahertz frequency selective surface  
High power VCSEL device with periodic gain active region (EI CONFERENCE) 会议论文  OAI收割
Optoelectronic Materials and Devices II, November 2, 2007 - November 5, 2007, Wuhan, China
作者:  Zhang Y.;  Liu Y.;  Liu Y.;  Liu Y.;  Qin L.
收藏  |  浏览/下载：31/0  |  提交时间：2013/03/25
High power vertical cavity surface emitting lasers with large aperture have been fabricated through improving passivation  lateral oxidation and heat dissipation techniques. Different from conventional three quantum well structure  a periodic gain active region with nine quantum wells was incorporated into the VCSEL structure  with which high efficiency and high power operation were expected. The nine quantum wells were divided into three groups with each of them located at the antinodes of the cavity to enhance the coupling between the optical field and the gain region. Large aperture and bottom-emitting configuration was used to improve the beam quality and the heat dissipation. A maximum output power of 1.4W was demonstrated at CW operation for a 400m-diameter device. The lasing wavelength shifted to 995.5nm with a FWHM of 2nm at a current of 4.8A due to the internal heating and the absence of active water cooling. A ring-shape farfield pattern was induced by the non-homogeneous lateral current distribution in large diameter device. The light intensity at the center of the ring increased with increasing current. A symmetric round light spot at the center and single transverse mode operation with a divergence angle of 16 were observed with current beyond 4.8A.  
on a class of pseudorandom sequences from elliptic curves over finite fields 期刊论文  OAI收割
Ieee Transactions on Information Theory, 2007, 卷号: 53, 期号: 7, 页码: 3，5-6
Hu Honggang; Hu Lei; Feng Dengguo
  |  收藏  |  浏览/下载：21/0  |  提交时间：2010/03/11
on a class of pseudorandom sequences from elliptic curves over finite fields 期刊论文  OAI收割
IEEE TRANSACTIONS ON INFORMATION THEORY, 2007, 卷号: 53, 期号: 7, 页码: 2598-2605
Hu Honggang; Hu Lei; Feng Dengguo
  |  收藏  |  浏览/下载：19/0  |  提交时间：2011/07/01
Tunable "optical activity" in electrorheological fluids 期刊论文  OAI收割
Physics Letters A, 2005, 卷号: 334, 期号: 5-6, 页码: 376-381
Q. Zhao; X. P. Zhao
收藏  |  浏览/下载：26/0  |  提交时间：2012/04/14
On properties of hyperchaos: Case study 期刊论文  OAI收割
Acta Mechanica Sinica, 1999, 卷号: 15, 期号: 4, 页码: 366-370
作者:  Liu CR(刘曾荣);  Chen LQ;  Yang L(杨凌)
收藏  |  浏览/下载：742/40  |  提交时间：2009/08/03