11 results on '"G.H. Gao"'
Search Results
2. Identification of a non-thermal X-ray burst with the Galactic magnetar SGR J1935+2154 and a fast radio burst using Insight-HXMT
- Author
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C.K. Li, Lin Lin, S.L. Xiong, Mingyu Ge, X.B. Li, Tipei Li, F.J. Lu, Shuang-Nan Zhang, Y.L. Tuo, Y. Nang, B. Zhang, S. Xiao, Y. Chen, L.M. Song, Y.P. Xu, C.Z. Liu, S.M. Jia, X.L. Cao, J.L. Qu, Shu Zhang, Y.D. Gu, J.Y. Liao, X.F. Zhao, Y. Tan, J.Y. Nie, H.S. Zhao, S.J. Zheng, Y.G. Zheng, Qi Luo, C. Cai, B. Li, W.C. Xue, Qingcui Bu, Zhi Chang, G. Chen, T.X. Chen, Yu-Peng Chen, Yong-Wei Dong, Y.Y. Du, H. Gao, G.H. Gao, M. Gao, J. Huo, D.W. Han, L.H. Jiang, Y. Huang, Weichun Jiang, J. Jin, L.D. Kong, Gang Li, J. Guan, M.S. Li, W. Li, X. Li, X.F. Li, Y.G. Li, Z.W. Li, X.H. Liang, B.S. Liu, H.W. Liu, X.J. Liu, B. Lu, X.F. Lu, T. Luo, X. Ma, B. Meng, G. Ou, N. Sai, X.Y. Song, L. Sun, Lian Tao, J. Wang, G.F. Wang, W.S. Wang, Y.S. Wang, X.Y. Wen, B.B. Wu, B.Y. Wu, M. Wu, G.C. Xiao, H. Xu, J.W. Yang, S. Yang, Yi-Jung Yang, Y.J. Yang, Q.B. Yi, Q.Q. Yin, Y. You, C.M. Zhang, A.M. Zhang, F. Zhang, H.M. Zhang, J. Zhang, T. Zhang, Wei Zhang, W.C. Zhang, Y. Zhang, Yue Zhang, Y.F. Zhang, Y.J. Zhang, Z.L. Zhang, D.K. Zhou, Y. Zhu, Y.X. Zhu, L. Chen, W.Z. Zhang, Y.B. Chen, W. Cui, J.K. Deng, M.X. Fu, Y.J. Jin, G.Q. Liu, Y.N. Liu, R.C. Shang, Zhao Zhang, Zhi Zhang, J.F. Zhou, C. Wang, C.C. Guo, and R.L. Zhuang
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Physics ,Neutron star ,Fast radio burst ,law ,Thermal ,Astrophysics ,Magnetar ,Event (particle physics) ,Radio spectrum ,Magnetic field ,Flare ,law.invention - Abstract
Fast radio bursts (FRBs) are short pulses observed in radio band from cosmological distances, some of which emit repeating bursts. The physical origins of these mysterious events have been subject to wide speculations and heated debates. One class of models invoke soft gamma-ray repeaters (SGRs), or magnetars, as the sources of FRBs. Magnetars are rotating neutron stars with extremely strong magnetic field and can sporadically emit bursts from X-ray (keV) to soft gamma-ray (sub-MeV) with duration from 102 s to 102 s. However, even though some bright radio bursts have been observed from some magnetars, no FRB-like events had been detected to be associated with any magnetar burst, including one giant flare, and no radio burst has been associated with any X-ray event from any magnetar. Therefore, there is still no observational evidence for magnetar-FRB association up to today. Recently, a pair of FRB-like bursts (FRB~200428 hereafter) separated by 30 milliseconds (ms) were detected from the general direction of the Galactic magnetar SGR~J1935+2154. Here we report the detection of a non-thermal X-ray burst in the 1--250\,keV energy band with the Insight-HXMT satellite, which we identify as emitted from SGR~J1935+2154. The burst showed two hard peaks with a separation of ms, consistent with the separation between the two bursts in FRB~200428. The delay time between the double radio and X-ray peaks is 8:57s, fully consistent with the dispersion delay of FRB~200428. We thus identify the non-thermal X-ray burst is associated with FRB~200428 whose high energy counterpart is the two hard peaks in X-ray. Our results suggest that the non-thermal X-ray burst and FRB~200428 share the same physical origin in an explosive event from SGR~J1935+2154.
- Published
- 2020
3. Insight-HXMT insight into switch of the accretion mode: the case of the X-ray pulsar 4U 1901+03
- Author
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Y.L. Tuo, L. Ji, S.S. Tsygankov, T. Mihara, L.M. Song, M.Y. Ge, A. Nabizadeh, L. Tao, J.L. Qu, Y. Zhang, S. Zhang, S.N. Zhang, Q.C. Bu, L. Chen, Y.P. Xu, X.L. Cao, Y. Chen, C.Z. Liu, C. Cai, Z. Chang, G. Chen, T.X. Chen, Y.B. Chen, Y.P. Chen, W. Cui, W.W. Cui, J.K. Deng, Y.W. Dong, Y.Y. Du, M.X. Fu, G.H. Gao, H. Gao, M. Gao, Y.D. Gu, J. Guan, C.C. Guo, D.W. Han, Y. Huang, J. Huo, S.M. Jia, L.H. Jiang, W.C. Jiang, J. Jin, Y.J. Jin, L.D. Kong, B. Li, C.K. Li, G. Li, M.S. Li, T.P. Li, W. Li, X. Li, X.B. Li, X.F. Li, Y.G. Li, Z.W. Li, X.H. Liang, J.Y. Liao, B.S. Liu, G.Q. Liu, H.W. Liu, X.J. Liu, Y.N. Liu, B. Lu, F.J. Lu, X.F. Lu, Q. Luo, T. Luo, X. Ma, B. Meng, Y. Nang, J.Y. Nie, G. Ou, N. Sai, R.C. Shang, X.Y. Song, L. Sun, Y. Tan, C. Wang, G.F. Wang, J. Wang, W.S. Wang, Y.S. Wang, X.Y. Wen, B.Y. Wu, B.B. Wu, M. Wu, G.C. Xiao, S. Xiao, S.L. Xiong, J.W. Yang, S. Yang, Y.J. Yang, Q.B. Yi, Q.Q. Yin, Y. You, A.M. Zhang, C.M. Zhang, F. Zhang, H.M. Zhang, J. Zhang, T. Zhang, W. Zhang, W.C. Zhang, W.Z. Zhang, Y.F. Zhang, Y.J. Zhang, Y.H. Zhang, Z. Zhang, Z.L. Zhang, H.S. Zhao, X.F. Zhao, S.J. Zheng, Y.G. Zheng, D.K. Zhou, J.F. Zhou, Y.X. Zhu, Y. Zhu, and R.L. Zhuang
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High Energy Astrophysical Phenomena (astro-ph.HE) ,Orbital elements ,Physics ,010308 nuclear & particles physics ,Astrophysics::High Energy Astrophysical Phenomena ,FOS: Physical sciences ,Astronomy and Astrophysics ,Astrophysics ,01 natural sciences ,Accretion (astrophysics) ,Accretion disc ,Pulsar ,Space and Planetary Science ,0103 physical sciences ,Astrophysics::Solar and Stellar Astrophysics ,Astrophysics - High Energy Astrophysical Phenomena ,010303 astronomy & astrophysics ,Astrophysics::Galaxy Astrophysics ,Fermi Gamma-ray Space Telescope ,X-ray pulsar - Abstract
We use the In data collected during the 2019 outburst from X-ray pulsar 4U 1901+03 to complement the orbital parameters reported by Fermi/GBM. Using the Insight-HXMT, we examine the correlation between the derivative of the intrinsic spin frequency and bolometric flux based on accretion torque models. It was found that the pulse profiles significantly evolve during the outburst. The existence of two types of the profile's pattern discovered in the Insight-HXMT data indicates that this source experienced transition between a super-critical and a sub-critical accretion regime during its 2019 outburst. Based on the evolution of the pulse profiles and the torque model, we derive the distance to 4U 1901+03 as 12.4+-0.2 kpc., 8 pages, 5 figures, accepted by JHEAP
- Published
- 2020
4. Constant cyclotron line energy in Hercules X-1 -- Joint Insight-HXMT and NuSTAR observations
- Author
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G.C. Xiao, L. Ji, R. Staubert, M.Y. Ge, S. Zhang, S.N. Zhang, A. Santangelo, L. Ducci, J.Y. Liao, C.C. Guo, X.B. Li, W. Zhang, J.L. Qu, F.J. Lu, T.P. Li, L.M. Song, Y.P. Xu, Q.C. Bu, C. Cai, X.L. Cao, Z. Chang, G. Chen, L. Chen, T.X. Chen, Y.B. Chen, Y. Chen, Y.P. Chen, W. Cui, W.W. Cui, J.K. Deng, Y.W. Dong, Y.Y. Du, M.X. Fu, G.H. Gao, H. Gao, M. Gao, Y.D. Gu, J. Guan, C. Gungor, D.W. Han, Y. Huang, J. Huo, S.M. Jia, L.H. Jiang, W.C. Jiang, J. Jin, L.D. Kong, B. Li, C.K. Li, G. Li, M.S. Li, W. Li, X. Li, X.F. Li, Y.G. Li, Z.W. Li, X.H. Liang, C.Z. Liu, G.Q. Liu, H.W. Liu, X.J. Liu, Y.N. Liu, B. Lu, X.F. Lu, Q. Luo, T. Luo, X. Ma, B. Meng, Y. Nang, J.Y. Nie, G. Ou, N. Sai, S.X. Song, L. Sun, Y. Tan, L. Tao, Y.L. Tuo, C. Wang, G.F. Wang, J. Wang, W.S. Wang, Y.S. Wang, X.Y. Wen, B.B. Wu, B.Y. Wu, M. Wu, S.L. Xiong, J.W. Yang, S. Yang, Y.J. Yang, Q.B. Yin, Q.Q. Yin, A.M. Zhang, C.M. Zhang, F. Zhang, H.M. Zhang, J. Zhang, T. Zhang, W.C. Zhang, W.Z. Zhang, Y. Zhang, Y.F. Zhang, Y.J. Zhang, Z. Zhang, Z.L. Zhang, H.S. Zhao, X.F. Zhao, S.J. Zheng, J.F. Zhou, Y. Zhu, and Y.X. Zhu
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High Energy Astrophysical Phenomena (astro-ph.HE) ,Physics ,010308 nuclear & particles physics ,Astrophysics::High Energy Astrophysical Phenomena ,Cyclotron ,Phase (waves) ,FOS: Physical sciences ,Centroid ,Astronomy and Astrophysics ,Astrophysics ,01 natural sciences ,law.invention ,QC Physics ,Space and Planetary Science ,law ,0103 physical sciences ,Spectral analysis ,Constant (mathematics) ,Astrophysics - High Energy Astrophysical Phenomena ,010303 astronomy & astrophysics ,Joint (geology) ,Energy (signal processing) ,Line (formation) - Abstract
The long-term evolution of the centroid energy of the CRSF in Her X-1 is still a mystery. We report a new measurement from a campaign between {\sl Insight}-HXMT and {\sl NuSTAR} performed in February 2018. Generally, the two satellites show well consistent results of timing and spectral properties. The joint spectral analysis confirms that the previously observed long decay phase has ended, and that the line energy instead keeps constant around 37.5 keV after flux correction.
- Published
- 2019
5. Effect of Powder Size and Volume Fraction of WC on the Microstructure of Laser Cladding WC-NiCrBSi Composite Coatings
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Yu-Yue Wang, Ting Sun, P.F. Ni, Z. Liu, Y.F. Gong, C.J. Li, and G.H. Gao
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Materials science ,Coating ,Volume (thermodynamics) ,Carbon steel ,Scanning electron microscope ,Composite number ,Volume fraction ,engineering ,General Medicine ,Laser power scaling ,Composite material ,engineering.material ,Microstructure - Abstract
WC-NiCrBSi composite coatings on 0.45 % carbon steel were fabricated by laser cladding. The volume fraction (33, 43 and 60 vol. %) of WC particles with the powder size of 2 μm, 5 μm and 50 μm were added respectively into NiCrBSi powders to deposit composite coatings. The microstructure of the powders and the coatings were examined by scanning electron microscope (SEM) and X-ray diffraction (XRD). Results show that the compactness and uniformity of the coatings are good when WC particles size was 2 μm and 5 μm. However nonuniform distribution and deposit of WC particles on the bottom of the coating will occur when the powder size of WC particles was 50 μm and the volume fraction of WC was 33 %. When the volume of WC addition was higher than 60 %, the volume fraction of the retained WC particles in the coatings is obviously decreased. The dissolving and decomposing of WC increase with decreasing the powder size and increasing the volume of WC addition and the laser power.
- Published
- 2011
6. Growth of Al–N codoped p-type ZnMgO thin films on different substrates
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Zunzhong Ye, Yu-Jia Zeng, Y.F. Lu, Liping Zhu, Z.X. Jian, G.H. Gao, S.H. Hu, and Binghui Zhao
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Photoluminescence ,Materials science ,Silicon ,Scanning electron microscope ,Doping ,Analytical chemistry ,chemistry.chemical_element ,Condensed Matter Physics ,Acceptor ,Crystallinity ,X-ray photoelectron spectroscopy ,chemistry ,General Materials Science ,Electrical and Electronic Engineering ,Thin film - Abstract
Al–N codoped p-type ZnMgO thin films were prepared on three different substrates, namely glass, quartz, and silicon. Significant differences in the crystallinity, surface morphology, and electrical properties on these substrates were investigated by means of x-ray diffraction, field-emission scanning electron microscopy, and Hall-effect measurements. It is demonstrated that the Al donor enhances the incorporation of the N acceptor, resulting in better p-type conductivity. The incorporation of the N acceptor, as well as the Al and Mg, was confirmed x-ray photoelectron spectroscopy. Transmittance and photoluminescence spectra suggested a wider bandgap for the ZnMgO thin films in comparison with ZnO, which is believed to be the result of the incorporation of Mg.
- Published
- 2008
7. Discussion on the Radial Superresolution of the Two-Photon Microfabrication
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Guang Hong Duan, Q.F. Tan, P. Wei, G.H. Gao, and Yu Zhu
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Diffraction ,Optics ,Materials science ,Two-photon excitation microscopy ,Resist ,Mechanics of Materials ,business.industry ,Mechanical Engineering ,General Materials Science ,business ,Superresolution ,Microfabrication - Abstract
In order to improve the radial superresolution of the two-photon microfabrication, the superresolution diffraction theory was introduced in detail. The theoretical analysis of the photosensitive resist based on the exciting power and concentration of free radical was given.. And the superresolution diffractive optical element was applied in the two-photon microfabrication system. Simulation results indicated that the radial superresolution of the two-photon microfabrication can be improved with the superresolution diffractive optical element.
- Published
- 2007
8. The study on rural migrant workers cluster in the central China—In the case of three different types of villages in Henan province
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E.L. Li, X.S. Fan, Q. Luo, and G.H. Gao
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Rural migrant ,Geography ,Central china ,Disease cluster ,Socioeconomics - Published
- 2015
9. Optimized Design of Multi-Ingredient Radar Absorbing Materials Using Genetic Algorithms
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Jianguo Guan, Z.P. Gan, G.H. Gao, and Qing Jie Zhang
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Ingredient ,Materials science ,Mechanics of Materials ,law ,Mechanical Engineering ,Electronic engineering ,General Materials Science ,Radar ,Microwave absorber ,law.invention - Published
- 2003
10. Application of a Plasma Reactor to Modify Egg Ovalbumin for Improved Solubility
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P.L. Muino, Thomas J. Herald, and G.H. Gao
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Circular dichroism ,Chromatography ,biology ,medicine.diagnostic_test ,Enthalpy ,chemistry.chemical_element ,Oxygen ,Ovalbumin ,Differential scanning calorimetry ,chemistry ,Spectrophotometry ,biology.protein ,medicine ,sense organs ,Solubility ,Polyacrylamide gel electrophoresis ,Food Science - Abstract
A plasma reactor was used to change the surface structure of ovalbumin and enhance solubility. The gases used to generate the plasmas were air, argon, nitrogen and oxygen. Ovalbumin was exposed to the gases for 10, 20, 30, 60, and 120 min. Unexposed ovalbumin served as the control. Samples were examined by polyacrylamide gel electrophoresis (PAGE), spectrophotometry, fluorometry, differential scanning calorimetry, and circular dichroism. Solubility and hydrophobicity of ovalbumin increased with exposure time, whereas endothermic enthalpy, onset temperature and peak temperature of ovalbumin decreased. No evidence of protein hydrolysis was observed in PAGE. No change in CD spectra resulted from the plasma treatment. The structural changes were regarded as conformational adaptability.
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- 2001
11. Discussion on the Radial Superresolution of the Two-Photon Microfabrication
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P. Wei, Y. Zhu, Q.F. Tan, G.H. Duan, and G.H. Gao
- Published
- 2007
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