中国科学院机构知识库网格系统: 检索

Time Series Segmentation Clustering: A New Method for S-Phase Picking in Microseismic Data 期刊论文 OAI收割
IEEE GEOSCIENCE AND REMOTE SENSING LETTERS, 2021, 页码: 5
作者: Zhu, Xinhao; Chen, Bingrui; Wang, Xu; Li, Tao

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收藏 | 浏览/下载：23/0 | 提交时间：2022/02/17

Data mining Clustering algorithms Monitoring Time series analysis Linear programming Rocks Partitioning algorithms K-means algorithm microseismic monitoring phase arrival picking S-wave

Application of Ultra Narrow Band Modulation in Enhanced Loran System 期刊论文 OAI收割
SENSORS, 2021, 卷号: 21, 期号: 13, 页码: 12
作者: Lyu, Boyun; Hua, Yu; Yuan, Jiangbin; Li, Shifeng

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收藏 | 浏览/下载：34/0 | 提交时间：2021/11/29

data rate enhanced Loran (eLoran) system extended binary phase shift keying (EBPSK) modulation ultra narrow band (UNB) modulation

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

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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.

Thermodynamic re-assessment and liquidus projection of the Cu-Ni-Ti system 期刊论文 OAI收割
CALPHAD-COMPUTER COUPLING OF PHASE DIAGRAMS AND THERMOCHEMISTRY, 2021, 卷号: 73
作者: Jin, Bo; Lu, Xingxu; Liu, Shuhong; Xu, Kai; Du, Yong

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收藏 | 浏览/下载：23/0 | 提交时间：2021/12/01

COUPLED PHASE-DIAGRAMS TITANIUM-NICKEL SYSTEM GLASS-FORMING ABILITY BULK METALLIC GLASSES RICH REGION INTERMETALLIC COMPOUNDS THERMOCHEMICAL DATA X-RAY EQUILIBRIA TRANSITION

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

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收藏 | 浏览/下载：47/0 | 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 distances^1-3. It has long been speculated that magnetars are the engine powering repeating bursts from FRB sources^4-13, 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 flare^18-21. 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.

Insight-HXMT observations of Swift J0243.6+6124: the evolution of RMS pulse fractions at super-Eddington luminosity 期刊论文 OAI收割
Monthly Notices of the Royal Astronomical Society, 2020, 卷号: 497, 页码: 5498-5506
作者: HXMT

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收藏 | 浏览/下载：46/0 | 提交时间：2022/02/08

stars: neutron pulsars: individual: Swift J0243.6+6124 X-rays: binaries Astrophysics - High Energy Astrophysical Phenomena Abstract: Based on Insight-HXMT data, we report on the pulse fraction evolution during the 2017-2018 outburst of the newly discovered first Galactic ultraluminous X-ray (ULX) source Swift J0243.6+6124. The pulse fractions of 19 observation pairs selected in the rising and fading phases with similar luminosity are investigated. The results show a general trend of the pulse fraction increasing with luminosity and energy at supercritical luminosity. However, the relative strength of the pulsation between each pair evolves strongly with luminosity. The pulse fraction in the rising phase is larger at luminosity below 7.71 × 10³⁸ erg s^-1, but smaller at above. A transition luminosity is found to be energy independent. Such a phenomenon is first confirmed by Insight-HXMT observations and we speculate that it may have relation with the radiation-pressure-dominated accretion disc.

PMU Placement Protection against Coordinated False Data Injection Attacks in Smart Grid 期刊论文 OAI收割
IEEE Transactions on Industry Applications, 2020, 卷号: 56, 期号: 4, 页码: 4381-4393
作者: Pei C(裴超); Xiao Y(肖杨); Liang W(梁炜); Han XJ(韩晓佳)

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收藏 | 浏览/下载：32/0 | 提交时间：2020/08/22

Cyber security cyber-physical system false data injection phase measurement units (PMUs) state estimation smart grid

Inverse elastic scattering problems with phaseless far field data 期刊论文 OAI收割
Inverse Problems, 2019, 卷号: 35, 期号: 11
作者: Ji,Xia; Liu,Xiaodong

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收藏 | 浏览/下载：82/0 | 提交时间：2019/12/13

elastic scattering phaseless far field data uniqueness phase retrieval direct sampling methods

Genome-wide dynamic network analysis reveals a critical transition state of flower development in Arabidopsis 期刊论文 OAI收割
BMC PLANT BIOLOGY, 2019, 卷号: 19, 页码: 18
作者: Zhang, Xiujun; Chen, Luonan; Jiang, Zhonglin; Zhang, Aidi; Liu, Xiaoping

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收藏 | 浏览/下载：83/0 | 提交时间：2019/03/05

Time-course gene expression data Gene regulatory network (GRN) Dynamical network biomarker (DNB) Phase transition Flower development

Target Reconstruction with a Reference Point Scatterer using Phaseless Far Field Patterns 期刊论文 OAI收割
SIAM JOURNAL ON IMAGING SCIENCES, 2019, 卷号: 12, 期号: 1, 页码: 372-391
作者: Ji, Xia; Liu, Xiaodong; Zhang, Bo

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收藏 | 浏览/下载：47/0 | 提交时间：2020/01/10

phaseless data phase retrieval stability sampling method far field pattern