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浏览/检索结果: 共19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 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.   Carbon content and climate variability drive global soil bacterial diversity patterns 期刊论文  OAI收割 ECOLOGICAL MONOGRAPHS, 2016, 卷号: 86, 期号: 3, 页码: 373-390 作者:  Osanai, Yui;  Liu, Yu-Rong;  Hamonts, Kelly;  Jeffries, Thomas C.;  Singh, Brajesh K.   |  收藏  |  浏览/下载：32/0  |  提交时间：2017/04/05 Bacterial Composition  Biodiversity  Diurnal Temperature Range  Global Biogeography  Soil Carbon  Terrestrial Ecosystems   Classification of small-scale eucalyptus plantations based on NDVI time series obtained from multiple high-resolution datasets 期刊论文  OAI收割 Remote Sensing, 2016, 卷号: 8, 期号: 2 作者:  Qiao, Hailang;  Wu, Mingquan;  Shakir, Muhammad;  Wang, Li;  Kang, Jun 收藏  |  浏览/下载：32/0  |  提交时间：2017/04/24 LONG-RANGE TRANSPORT  CHEMICAL-COMPOSITION  SOUTHERN MONGOLIA  SEMIARID CHINA  EVENTS  SATELLITE  VARIABILITY  FREQUENCY  AERONET  WIND   Effects of Pore-Size Range and Composition of Polysaccharide Gels on Flow Behaviors and Selective Sorting of Single-Walled Carbon Nanotubes 期刊论文  OAI收割 ACTA PHYSICO-CHIMICA SINICA, 2014, 卷号: 30, 期号: 9, 页码: 1764-1770 作者:  Jin HH(金赫华);  Li QW(李清文) 收藏  |  浏览/下载：25/0  |  提交时间：2014/12/01 Single-walled carbon nanotube  Separation  Pore-size range  Composition  Polysaccharide gel chromatography   Gradient Structure-Induced Temperature Responsiveness in Styrene/Methyl Methacrylate Gradient Copolymers Micelles 期刊论文  OAI收割 macromolecular rapid communications, 2014, 卷号: 35, 期号: 3, 页码: 309-316 Zheng,Chao; Huang,Haiying; He,Tianbai 收藏  |  浏览/下载：24/0  |  提交时间：2015/10/15 In this work  micelles are formed by gradient copolymer of styrene and methyl methacrylate in acetone-water mixture and their temperature responsiveness is investigated in a narrow range near room temperature. Three different kinds of structural transitions could be induced by temperature: unimers to micelle transition  shrinkage/stretching of micelles  and morphological transition from spherical micelles to vesicles. In addition  a model analysis on the interface of gradient copolymer micelle is made to better understand these phenomena. It is found that both position and composition of the interface could alter in response to the change in temperature. According to the experiments and model analysis  it is proposed that temperature responsiveness might be an intrinsic and universal property of gradient copolymer micelles  which only originates from the gradient structure.   Forest Biodiversity Assessment in Peruvian Andean Montane Cloud Forest 期刊论文  OAI收割 Journal of Mountain Science, 2012, 卷号: 9, 期号: 3, 页码: 372-384 Alicia Ledo; Sonia Condés; Iciar Alberdi 收藏  |  浏览/下载：34/0  |  提交时间：2013/04/16 Andean Range  Biodiversity  Dead wood  Montane forest  Species composition  Stand structure  Tropical forest   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：48/0  |  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.   Dependence of critical condition in liquid chromatography on the pore size of column substrates 期刊论文  OAI收割 polymer, 2011, 卷号: 52, 期号: 14, 页码: 3219-3225 Zhu YT; Ziebarth JD; Wang YM 收藏  |  浏览/下载：23/0  |  提交时间：2012/06/11 CRITICAL ADSORPTION POINT  METHYL-METHACRYLATE COPOLYMERS  CHEMICAL-COMPOSITION DISTRIBUTION  BLOCK-COPOLYMERS  EXCLUSION CHROMATOGRAPHY  POLYMER-CHAINS  CRITICAL RANGE  ELUTION CHROMATOGRAPHY  RETENTION BEHAVIOR  DIBLOCK COPOLYMERS   Transport of semivolatile organic compounds to the Tibetan Plateau: Monthly resolved air concentrations at Nam Co 期刊论文  OAI收割 JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2010, 卷号: 115, 期号: D16310 作者:  Kang SC(康世昌);  Zhang QG(张强弓) 收藏  |  浏览/下载：28/0  |  提交时间：2011/04/26 POLYCYCLIC AROMATIC-HYDROCARBONS  ORGANOCHLORINE PESTICIDES OCPS  NORTH-AMERICAN ATMOSPHERE  FLOW-THROUGH SAMPLER  LONG-RANGE TRANSPORT  HEXACHLOROCYCLOHEXANES HCHS  PERSISTENT ORGANOCHLORINES  POLYCHLORINATED-BIPHENYLS  CHLORINATED PESTICIDES  CHEMICAL-COMPOSITION   Research on method of measuring the time of remote explosion point (EI CONFERENCE) 会议论文  OAI收割 27th International Congress on High-Speed Photography and Photonics, September 17, 2006 - September 22, 2006, Xi'an, China 作者:  Zhou J.;  Fu Y. 收藏  |  浏览/下载：22/0  |  提交时间：2013/03/25 The time when the bomb explodes is one of the most important indexes to appraise the test. According to the principles concerned with explosion radiation  the principle of measuring the time of remote explosion point and composition of measuring system is introduced. Use CCD to record the explosion radiation  DSP to process and record the high-capacity  high-speed video signals  and convert the exploding process examined by floating amplifier into digital signals. Besides  the article analyzes the composing and structural design of the log's optical system  principle of electric control and floating amplifier  dynamic range of the system  power analysis of the incident light  and how to improve the accuracy of measurement in great detail.