中国科学院机构知识库网格系统: 检索

Defect-engineered WO3-x@MoS2 hollow tube exhibiting enhanced Fenton-like and photocatalytic activities via electric field rearrangement and band alignment 期刊论文 OAI收割
APPLIED CATALYSIS B-ENVIRONMENTAL, 2023, 卷号: 320
作者: Hu, Yi; Nie, Mingxing; Hong, Peidong; He, Junyong; Li, Yulian

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收藏 | 浏览/下载：47/0 | 提交时间：2022/12/22

WO 3_x @MoS 2 hollow tube Electric field rearrangement Band alignment Fenton -like Environmental photocatalyst

Evolution of cracks in the shear bands of granite residual soil 期刊论文 OAI收割
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING, 2022, 卷号: 14, 期号: 6, 页码: 1956
作者: Li, Chengsheng; Kong, Lingwei; An, Ran

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收藏 | 浏览/下载：10/0 | 提交时间：2023/08/02

Shear band Crack classification method Digital volume correlation (DVC) X-ray computed tomography (CT) Granite residual soil

Digital Polarization Programmable Metasurface for Continuous Polarization Angle Rotation and Radar Applications 期刊论文 OAI收割
FRONTIERS IN MATERIALS, 2022, 卷号: 9
作者: Wang, Yidan; Shi, Hongyu; Chen, Juan; Yi, Jianjia; Dong L(董亮)

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收藏 | 浏览/下载：49/0 | 提交时间：2022/07/04

metasurface polarization rotation digital polarization programmable radar application X band

Na(3)AMg(7)(PO4)(6) (A = K, Rb and Cs): Structures, properties and theoretical studies of alkali metal magnesium orthophosphates 期刊论文 OAI收割
JOURNAL OF MOLECULAR STRUCTURE, 2021, 卷号: 1226, 期号: 2, 页码: 1-8
作者: Jiao, JH (Jiao, Jiahao)[ 1,2,3 ]; Jin, WQ (Jin, Wenqi)[ 1,2,3 ]; Zhang, M (Zhang, Min)[ 1,2,3 ]; Yang, ZH (Yang, Zhihua)[ 1,2,3 ]; Pan, SL (Pan, Shilie)[ 1,2,3 ]

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收藏 | 浏览/下载：71/0 | 提交时间：2021/01/11

Magnesium orthophosphates X-ray diffraction Thermal property Electronic band structure Optical property

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：49/0 | 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.

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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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.

Constraining the X-Ray-Infrared Spectral Index of Second-timescale Flares from SGR 1935+2154 with Palomar Gattini-IR 期刊论文 OAI收割
The Astrophysical Journal, 2020, 卷号: 901, 页码: L7
作者: HXMT

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收藏 | 浏览/下载：22/0 | 提交时间：2022/02/08

Radio transient sources Magnetars Soft gamma-ray repeaters 2008 992 1471 Astrophysics - High Energy Astrophysical Phenomena Astrophysics - Instrumentation and Methods for Astrophysics Abstract: The Galactic magnetar SGR 1935+2154 has been reported to produce the first example of a bright millisecond-duration radio burst (FRB 200428) similar to the cosmological population of fast radio bursts (FRBs). The detection of a coincident bright X-ray burst represents the first observed multiwavelength counterpart of an FRB. However, the search for similar emission at optical wavelengths has been hampered by the high inferred extinction on the line of sight. Here, we present results from the first search for second-timescale emission from the source at near-infrared (NIR) wavelengths using the Palomar Gattini-IR observing system in the J band, enabled by a novel detector readout mode that allows short exposure times of ?0.84 s with 99.9% observing efficiency. With a total observing time of ?12 hr (?47,728 images) during its 2020 outburst, we place median 3Ҡlimits on the second-timescale NIR fluence of ?18 Jy ms (13.1 AB mag). The corresponding extinction-corrected limit is ?125 Jy ms for an estimated extinction of A_J = 2.0 mag. Our observations were sensitive enough to easily detect an NIR counterpart of FRB 200428 if the NIR emission falls on the same power law as observed across its radio to X-ray spectrum. We report nondetection limits from epochs of four simultaneous X-ray bursts detected by the Insight-HXMT and NuSTAR telescopes during our observations. These limits provide the most stringent constraints to date on fluence of flares at 10¹⁴ Hz, and constrain the fluence ratio of the NIR emission to coincident X-ray bursts to R_NIR ? 0.025 (fluence index ?0.35).

Accelerated glacier mass loss (2011-2016) over the Puruogangri ice field in the inner Tibetan Plateau revealed by bistatic InSAR measurements 期刊论文 OAI收割
REMOTE SENSING OF ENVIRONMENT, 2019, 卷号: 231, 页码: 13
作者: Liu, Lin; Jiang, Liming; Jiang, Houjun; Wang, Hansheng; Ma, Ning

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收藏 | 浏览/下载：27/0 | 提交时间：2019/10/17

Annual glacier mass balance TanDEM-X bistatic InSAR X-band radar penetration Puruogangri ice field Inner Tibetan Plateau

Design, RF measurement, tuning, and high-power test of an X-band deflector for Soft X-ray Free Electron Lasers (SXFEL) at SINAP 期刊论文 OAI收割
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 2019, 卷号: 930, 页码: 210-219
作者: Zhao, Zhentang; Tan, Jianhao; Fang, Wencheng; Takatomi, Toshikazu; Tong, Dechun

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收藏 | 浏览/下载：61/0 | 提交时间：2019/06/20

X-band Deflector High power test

Shear band fracture in metallic glass: Hot or cold? 期刊论文 OAI收割
SCRIPTA MATERIALIA, 2019, 卷号: 162, 页码: 136-140
作者: Qu, R. T.; Wang, S. G.; Li, G. J.; Wang, R. F.; Wang, X. D.

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收藏 | 浏览/下载：17/0 | 提交时间：2021/02/02

Metallic glass Shear band Fracture X-ray tomography Temperature-rise