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浏览/检索结果: 共119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 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：52/0  |  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.   Confidence intervals for Markov chain transition probabilities based on next generation sequencing reads data 期刊论文  OAI收割 QUANTITATIVE BIOLOGY, 2020, 卷号: 8, 期号: 2, 页码: 143-154 作者:  Wan, Lin;  Kang, Xin;  Ren, Jie   |  收藏  |  浏览/下载：22/0  |  提交时间：2021/01/14 DNA  FREQUENCIES  PREDICTION  Markov chains  next generation sequencing  transition probabilities  confidence intervals   No pulsed radio emission during a bursting phase of a Galactic magnetar 期刊论文  OAI收割 Nature, 2020, 卷号: 587, 页码: 63-65 作者:  HXMT   |  收藏  |  浏览/下载：44/0  |  提交时间：2022/02/08 Astrophysics - High Energy Astrophysical Phenomena  Abstract: Fast radio bursts (FRBs) are millisecond-duration radio transients of unknown physical origin observed at extragalactic distances1-3. It has long been speculated that magnetars are the engine powering repeating bursts from FRB sources4-13, but no convincing evidence has been collected so far14. Recently, the Galactic magnetar SRG 1935+2154 entered an active phase by emitting intense soft íray bursts15. One FRB-like event with two peaks (FRB 200428) and a luminosity slightly lower than the faintest extragalactic FRBs was detected from the source, in association with a soft íray/hard-X-ray flare18-21. Here we report an eight-hour targeted radio observational campaign comprising four sessions and assisted by multi-wavelength (optical and hard-X-ray) data. During the third session, 29 soft-íray repeater (SGR) bursts were detected in íray energies. Throughout the observing period, we detected no single dispersed pulsed emission coincident with the arrivals of SGR bursts, but unfortunately we were not observing when the FRB was detected. The non-detection places a fluence upper limit that is eight orders of magnitude lower than the fluence of FRB 200428. Our results suggest that FRB-SGR burst associations are rare. FRBs may be highly relativistic and geometrically beamed, or FRB-like events associated with SGR bursts may have narrow spectra and characteristic frequencies outside the observed band. It is also possible that the physical conditions required to achieve coherent radiation in SGR bursts are difficult to satisfy, and that only under extreme conditions could an FRB be associated with an SGR burst.   Optimized Design of Integrated Ultra-Light Main Supporting Structure for Micro-Nano Remote-Sensing Camera 期刊论文  OAI收割 Guangxue Xuebao/Acta Optica Sinica, 2019, 卷号: 39, 期号: 7 作者:  T.Wang;  L.Zhang;  X.Jia;  G.Gao   |  收藏  |  浏览/下载：48/0  |  提交时间：2020/08/24 Structural design,Cameras,Electric power utilization,Functions,Natural frequencies,Optical systems,Remote sensing,Shape optimization,Titanium alloys,Topology   Structural design for the imaging unit of space optical remote camera 期刊论文  OAI收割 Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering, 2019, 卷号: 48, 期号: 11 作者:  X.Liu;  Z.Cheng;  D.Wang   |  收藏  |  浏览/下载：33/0  |  提交时间：2020/08/24 Cameras,Convergence of numerical methods,Finite element method,Natural frequencies,Optical testing   Optimum design of braced structure for optical fiber image transmission module based on inert strength 期刊论文  OAI收割 Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering, 2019, 卷号: 48, 期号: 5 作者:  F.Yang;  H.Tian;  C.Yan;  C.Wu;  D.Mu   |  收藏  |  浏览/下载：34/0  |  提交时间：2020/08/24 Light transmission,Ground supports,Imaging systems,Natural frequencies,Optical fibers,Optical glass,Optical instrument lenses,Shape optimization,Structural design,Structural optimization,Topology   Optimization of spatial micro-vibration simulation platform 期刊论文  OAI收割 Guangxue Jingmi Gongcheng/Optics and Precision Engineering, 2019, 卷号: 27, 期号: 12, 页码: 2590-2601 作者:  Z.-B.Xu;  D.-Y.Zhu;  S.He;  J.-L.Shen;  L.Zhao   |  收藏  |  浏览/下载：36/0  |  提交时间：2020/08/24 Simulation platform，Bandwidth，Mechanisms，Natural frequencies，Transfer functions   Lightweight design of fast steering mirror for space cameras 期刊论文  OAI收割 Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering, 2019, 卷号: 48, 期号: 4 作者:  K.Wang   |  收藏  |  浏览/下载：18/0  |  提交时间：2020/08/24 Mirrors,Cameras,Multiobjective optimization,Natural frequencies,Shape optimization,Structural design   Design of two-axis flexible support structure for fast steering mirror in space cameras 期刊论文  OAI收割 Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering, 2019, 卷号: 48, 期号: 12 作者:  K.Wang;  H.Xin;  N.Cao;  Z.Shi   |  收藏  |  浏览/下载：28/0  |  提交时间：2020/08/24 Optical testing,Cameras,Differential equations,Earth (planet),Ground supports,Mirrors,Modal analysis,Motion compensation,Natural frequencies,Orbits,Position control,Stiffness   Synteny-based mapping of causal point mutations relevant to sand rice (Agriophyllum squarrosum) trichomeless1 mutant by RNA-sequencing 期刊论文  iSwitch采集 JOURNAL OF PLANT PHYSIOLOGY, 2018, 卷号: 231, 页码: 86-95 作者:  Zhang, Jiwei;  Zhao, Pengshan;  Zhao, Jiecai;  Chen, Guoxiong 收藏  |  浏览/下载：80/0  |  提交时间：2019/10/09 Agriophyllum squarrosum  Trichome  Synteny-based mapping  Allele frequencies  Bulked-segregant analysis  Potential crop