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Timing analysis of Swift J1658.2-4242's outburst in 2018 with Insight-HXMT, NICER and AstroSat 期刊论文  OAI收割
Journal of High Energy Astrophysics, 2019, 卷号: 24, 页码: 30-40
作者:  HXMT
  |  收藏  |  浏览/下载：57/0  |  提交时间：2022/02/08
Accretion  accretion disks  Black hole physics  X-rays: binaries:  Swift J1658.2-4242  Astrophysics - High Energy Astrophysical Phenomena  Abstract: We present the observational results from a detailed timing analysis of the black hole candidate Swift J1658.2-4242 during its 2018 outburst with the observations of Hard X-ray Modulation Telescope (Insight-HXMT), Neutron Star Interior Composition Explorer (NICER) and AstroSat in 0.1-250 keV. The evolution of intensity, hardness and integrated fractional root mean square (rms) observed by Insight-HXMT and NICER are presented in this paper. Type-C quasi-periodic oscillations (QPOs) observed by NICER (0.8-3.5 Hz) and Insight-HXMT (1-1.6 Hz) are also reported in this work. The features of the QPOs are analyzed with an energy range of 0.5-50 keV. The relations between QPO frequency and other characteristics such as intensity, hardness and QPO rms are carefully studied. The timing and spectral properties indicate that Swift J1658.2-4242 is a black hole binary system. Besides, the rms spectra of the source calculated from the simultaneous observation of Insight-HXMT, NICER and AstroSat support the Lense-Thirring origin of the QPOs. The relation between QPO phase lag and the centroid frequency of Swift J1658.2-4242 reveals a near zero constant when < 4Hz and a soft phase lag at 6.68 Hz. This independence follows the same trend as the high inclination galactic black hole binaries such as MAXI J1659-152.  
Design and image restoration research of a cubic-phase-plate system (EI CONFERENCE) 会议论文  OAI收割
5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies, April 26, 2010 - April 29, 2010, Dalian, China
作者:  Zhang J.;  Zhang J.;  Zhang J.;  Shi G.;  Zhang X.
收藏  |  浏览/下载：25/0  |  提交时间：2013/03/25
Wave-front coding technology is a novel jointly optical and digital imaging technology which can greatly extend the depth of focus of optical systems. The image restoration process is an important part of wave-front coding technology. Using wave-front coding makes the modulation transfer function(MTF) values of the optical systems change little over a range of several times the depth of focus  which means the system MTF is quite insensitive to defocus  and there is no zero in the passband. So we can design a single filter for the restoration of images in different defocus positions. However  it's hard to avoid noise during image acquisition and transmission processes. These noises will be amplified in the image restoration  especially in the high frequency part when the MTF drop is relatively low. The restoration process significantly reduces the system signal to noise ratio this way. Aimed at the problem of noise amplification  a new algorithm was proposed which incorporated wavelet denoising into the iterative steps of Lucy-Richardson algorithm. Better restoration results were obtained through the new algorithm  effectively solving the noise amplification problem of original LR algorithm. Two sets of identical triplet imaging systems were designed  in one of which the cubic-phase-plate was added. Imaging experiments of the manufactured systems were carried  and the images of a traditional system and a wave-front coded system before and after decoding were compared. The results show that the designed wave-front coded system can extend the depth of focus by 40 times compared with the traditional system while maintaining the light flux and the image plane resolution. 2010 Copyright SPIE - The International Society for Optical Engineering.  
PAIRING CORRELATIONS WITH RESONANT CONTINUUM EFFECT IN THE RMF plus ACCC plus BCS APPROACH 期刊论文  OAI收割
INTERNATIONAL JOURNAL OF MODERN PHYSICS E-NUCLEAR PHYSICS, 2009, 卷号: 18, 期号: 8, 页码: 1761-1772
作者:  Zhang, S. S.;  Zhang, SS , Beihang Univ, Dept Phys, Sch Sci, Beijing 100083, Peoples R China
  |  收藏  |  浏览/下载：22/0  |  提交时间：2012/08/02
Pseudo-spin symmetry in density-dependent relativistic Hartree-Fock theory 期刊论文  OAI收割
PHYSICS LETTERS B, 2006, 卷号: 639, 期号: 40972, 页码: 242-247
作者:  Long, Wen Hui;  Sagawa, Hiroyuki;  Meng, Jie;  Van Giai, Nguyen;  Long, WH , Peking Univ, Sch Phys, Beijing 100871, Peoples R China
  |  收藏  |  浏览/下载：16/0  |  提交时间：2012/08/02
Density-dependent relativistic Hartree-Fock approach 期刊论文  OAI收割
PHYSICS LETTERS B, 2006, 卷号: 640, 期号: 4, 页码: 150-154
作者:  Long, Wen-Hui;  Van Giai, Nguyen;  Meng, Jie;  Meng, J , Peking Univ, Sch Phys, Beijing 100871, Peoples R China
  |  收藏  |  浏览/下载：8/0  |  提交时间：2012/08/02
Relativistic mean field description of nuclear structure 期刊论文  OAI收割
HIGH ENERGY PHYSICS AND NUCLEAR PHYSICS-CHINESE EDITION, 2004, 卷号: 28, 期号: 0, 页码: 21-26
作者:  Zhou, SG;  Zhou, SG , Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China.
  |  收藏  |  浏览/下载：25/0  |  提交时间：2012/08/30
Exploration of unbound states by analytical continuation in the coupling constant method within relativistic mean field theory 期刊论文  OAI收割
CHINESE PHYSICS LETTERS, 2001, 卷号: 18, 期号: 2, 页码: 196-198
作者:  Yang, SC;  Meng, J;  Zhou, SG;  Yang, SC , Peking Univ, Dept Tech Phys, Beijing 100871, Peoples R China.
  |  收藏  |  浏览/下载：18/0  |  提交时间：2012/08/29
The surface diffuseness and the spin-orbital splitting in relativistic continuum Hartree-Bogoliubov theory 期刊论文  OAI收割
NUCLEAR PHYSICS A, 1999, 卷号: 650, 页码: 176-196
作者:  Meng, J;  Tanihata, I
  |  收藏  |  浏览/下载：17/0  |  提交时间：2018/05/31
A self-consistent approach to the J(1)-J(2)-J(3) model 期刊论文  OAI收割
PHYSICS LETTERS A, 1997, 卷号: 236, 期号: 5-6, 页码: 589
Yang, J; Yu, DK; Shen, JL
收藏  |  浏览/下载：26/0  |  提交时间：2013/09/17