中国科学院机构知识库网格系统: 检索

Fracturing and acoustic emission characteristics of saturated reservoir rocks under constant-amplitude-cyclic loading 期刊论文 OAI收割
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT, 2024, 卷号: 83, 期号: 10, 页码: 17
作者: Zhu, Jun; Chen, Xiaoqing; Chen, Jiangang; Liu, Ziming; Deng, Jianhui

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收藏 | 浏览/下载：10/0 | 提交时间：2024/11/20

Fracture behavior Acoustic emission Saturated reservoir rock Cyclic loading Failure pattern Spectrum analysis

Isotope shift in optical spectra of MoO 期刊论文 OAI收割
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER, 2022, 卷号: 277, 页码: 8
作者: Zhang, Lei; Yu, Yao; Qian, Dongbin; Zhao, Dongmei; Ma, Xinwen

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收藏 | 浏览/下载：68/0 | 提交时间：2021/12/13

MoO LIF SVL emission spectrum Isotope shift Perturbation

Feasibility of source identification by DOM fingerprinting in marine pollution events 期刊论文 OAI收割
MARINE POLLUTION BULLETIN, 2021, 卷号: 173, 页码: 9
作者: Jiang, Ming; Sheng, Yanqing; Tian, Chongguo; Li, Changyu; Liu, Qunqun

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收藏 | 浏览/下载：37/0 | 提交时间：2022/06/16

Dissolved organic matter Excitation-emission matrix spectrum Parallel factor analysis Marine pollution events

Influence of lithium and silicon coatings on tungsten erosion in arc plasma 期刊论文 OAI收割
JOURNAL OF NUCLEAR MATERIALS, 2021, 卷号: 555
作者: Tang, Z. L.; Zuo, G. Z.; Li, C. L.; Huang, M.; Zhang, X. B.

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收藏 | 浏览/下载：57/0 | 提交时间：2021/09/06

Arc erosion Mitigation Tungsten Lithium coating Silicon coating Optical emission spectrum

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：24/0 | 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).

An underlying clock in the extreme flip-flop state transitions of the black hole transient Swift J1658.2-4242 期刊论文 OAI收割
Astronomy and Astrophysics, 2020, 卷号: 641, 页码: A101
作者: HXMT

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收藏 | 浏览/下载：58/0 | 提交时间：2022/02/08

accretion accretion disks black hole physics X-rays: binaries time Astrophysics - High Energy Astrophysical Phenomena Abstract:
Aims: Flip-flops are top-hat-like X-ray flux variations, which have been observed in some transient accreting black hole binary systems, and feature simultaneous changes in the spectral hardness and the power density spectrum (PDS). They occur at a crucial time in the evolution of these systems, when the accretion disc emission starts to dominate over coronal emission. Flip-flops remain a poorly understood phenomenon, so we aim to thoroughly investigate them in a system featuring several such transitions.
Methods: Within the multitude of observations of Swift J1658.2-4242 during its outburst in early 2018, we detected 15 flip-flops, enabling a detailed analysis of their individual properties and the differences between them. We present observations by XMM-Newton, NuSTAR, Astrosat, Swift, Insight-HXMT, INTEGRAL, and ATCA. We analysed their light curves, searched for periodicities, computed their PDSs, and fitted their X-ray spectra, to investigate the source behaviour during flip-flop transitions and how the interval featuring flip-flops differs from the rest of the outburst.
Results: The flip-flops of Swift J1658.2-4242 are of an extreme variety, exhibiting flux differences of up to 77% within 100 s, which is much larger than what has been seen previously. We observed radical changes in the PDS simultaneous with the sharp flux variations, featuring transitions between the quasi-periodic oscillation types C and A, which have never been observed before. Changes in the PDS are delayed, but more rapid than changes in the light curve. Flip-flops occur in two intervals within the outburst, separated by about two weeks in which these phenomena were not seen. Transitions between the two flip-flop states occurred at random integer multiples of a fundamental period of 2.761 ks in the first interval and 2.61 ks in the second. Spectral analysis reveals the high and low flux flip-flop states to be very similar, but distinct from intervals lacking flip-flops. A change of the inner temperature of the accretion disc is responsible for most of the flux difference in the flip-flops. We also highlight the importance of correcting for the influence of the dust scattering halo on the X-ray spectra.

Harmonics of Solar Radio Spikes at Metric Wavelengths 期刊论文 OAI收割
SOLAR PHYSICS, 2018, 卷号: 293, 期号: 3, 页码: 39
作者: Feng, S. W.; Chen, Y.; Li, C. Y.; Wang, B.; Wu, Z.

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收藏 | 浏览/下载：27/0 | 提交时间：2018/05/04

Radio Burst Dynamic Spectrum Radio Spike Electron Cyclotron Maser Emission

Distinct Excitonic Circular Dichroism between Wurtzite and Zincblende CdSe Nanoplatelets 期刊论文 OAI收割
NANO LETTERS, 2018, 卷号: 18, 期号: 11, 页码: 6665
作者: Gao, XQ; Zhang, XW; Zhao, LY; Huang, P

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收藏 | 浏览/下载：51/0 | 提交时间：2018/12/29

Circular Dichroism Spectrum Quantum Dots Optical Activity 2-photon Absorption Cdse Nanoplatelets Amino-acids Wurtzite Chirality Zincblende Nanoparticles Excitonic Transition Nanocrystals Biomolecules Recognition Dependence Emission

OSCILLATOR STRENGTHS OF VIBRIONIC EXCITATIONS OF NITROGEN DETERMINED BY THE DIPOLE (gamma, gamma) METHOD 期刊论文 OAI收割
ASTROPHYSICAL JOURNAL, 2016, 卷号: 819, 期号: 2, 页码: —
作者: Liu, YW; Kang, X; Xu, LQ; Ni, DD; Yang, K

收藏 | 浏览/下载：127/0 | 提交时间：2016/09/12

EXTREME-ULTRAVIOLET EMISSION ENERGY-LOSS SPECTRUM HIGH-RESOLUTION ELECTRON-IMPACT CROSS-SECTIONS ABSORPTION-SPECTRUM N-2 TRANSITIONS STATE BAND

Highlights of the ARGO-YBJ Experiment at 4,300 m a.s.l. 期刊论文 OAI收割
BRAZILIAN JOURNAL OF PHYSICS, 2014, 卷号: 44, 期号: 5, 页码: 494-503
作者: ARGO-YBJ Collaboration

收藏 | 浏览/下载：23/0 | 提交时间：2015/12/02

GAMMA-RAY OBSERVATION COSMIC-RAYS GALACTIC PLANE CRAB-NEBULA ENERGY-SPECTRUM TEV EMISSION ANISOTROPY MILAGRO PULSAR