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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:

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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 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.

A Filamentary Plasma Jet Generated by Argon Dielectric-Barrier Discharge in Ambient Air 期刊论文 OAI收割
IEEE TRANSACTIONS ON PLASMA SCIENCE, 2019, 卷号: 47, 期号: 7, 页码: 3134-3140
作者: Li, Jing; Lei, Bingying; Wang, Jing; Zhang, Tongyi; Tang, Jie

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收藏 | 浏览/下载：76/0 | 提交时间：2019/07/26

Dielectric-barrier discharge (DBD) filamentary discharge optical emission spectra plasma jet

In-situ plasma cleaning to decrease the field emission effect of half-wave superconducting radio-frequency cavities 期刊论文 OAI收割
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 2018, 卷号: 905, 页码: 61-70
作者: Zhao, Hongwei; Chu, Qingwei; Xiong, Pingran; Guo, Hao; Li, Yongming

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收藏 | 浏览/下载：131/0 | 提交时间：2018/10/08

In-situ plasma cleaning Half-wave SRF cavity Optical emission spectra Contamination Field emission effect

Effect of distances between lens and sample surface on laser-induced breakdown spectroscopy with spatial confinement 期刊论文 OAI收割
Plasma Science & Technology, 2018, 卷号: 20, 期号: 8, 页码: 8
作者: Jiang, Z. H.; Shao, J. F.; Wang, T. F.; Guo, J.; Zhang, D.

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收藏 | 浏览/下载：7/0 | 提交时间：2019/09/17

laser-induced breakdown spectroscopy LIBS spatial confinement distance of lens-to-sample signal enhancement optical-emission induced plasmas cu plasma ablation enhancement spectrometry spectra argon Physics

SnS nanostructures prepared by simple film technique: Catalyst-free vacuum thermal evaporation 期刊论文 OAI收割
Micro and Nano Letters, 2014, 卷号: 9, 期号: 1, 页码: 34-36
作者: Li, Jin; Wang, Shengfeng; Jian, Jikang; Sun, Yanfei; Xu, Jinbao

收藏 | 浏览/下载：29/0 | 提交时间：2014/11/11

nanostructured materials photoluminescence scanning electron microscopy tin compounds transmission electron microscopy vacuum deposition X-ray diffraction tin chips starting materials scanning electron microscopy transmission electron microscopy high-resolution TEM as-prepared products X-ray diffraction orthorhombic phase photoluminescence spectra emission bandcentres visible light emitter infrared light emitter optical devices nanostructures simple film technique catalyst-free vacuum thermal evaporation wavelength 555 4 nm electron volt energy 2 24 eV electron volt energy 1 58 eV wavelength 785 nm SnS

Inactivation of He la cancer cells by an atmospheric pressure cold plasma jet 期刊论文 OAI收割
ACTA PHYSICA SINICA, 2013, 卷号: 62, 期号: 6
Huang, J; Chen, W; Li, H; Wang, PY; Yang, SZ

收藏 | 浏览/下载：31/0 | 提交时间：2014/01/16

atmospheric pressure cold plasma jet Hela cancer cells survival rate optical emission spectra

Intense yellow emission in Dy(3+)-doped LiGd(MoO(4))(2) crystal for visible lasers 期刊论文 OAI收割
Optical Materials, 2011, 卷号: 34, 期号: 1, 页码: 56-60
W. W. Zhou; B. Wei; W. Zhao; G. F. Wang; X. Bao; Y. H. Chen; F. W. Wang; J. M. Du; H. J. Yu

收藏 | 浏览/下载：24/0 | 提交时间：2012/06/06

Optical spectroscopy Czochralski method Molybdates Solid-state laser materials rare-earth ions optical spectroscopy single-crystals dy3+ ions absorption intensities stimulated-emission spectra growth transitions ho3

Spectroscopic investigation of Dy(3+)-doped Li(2)Gd(4)(MoO(4))(7) crystal for potential application in solid-state yellow laser 期刊论文 OAI收割
Journal of Alloys and Compounds, 2011, 卷号: 509, 期号: 9, 页码: 3937-3942
W. Zhao; W. W. Zhou; M. J. Song; G. F. Wang; J. M. Du; H. J. Yu; J. X. Chen

收藏 | 浏览/下载：40/0 | 提交时间：2012/06/06

Optical materials Crystal growth Optical properties Luminescence rare-earth ions optical-properties single-crystals dy3+ ions absorption intensities energy-levels emission spectra kpb2cl5 glasses

Control of N/N2 species ratio in NO plasma for p-type doping of ZnO (EI CONFERENCE) 会议论文 OAI收割
作者: Chen X.; Liu L.; Liu L.; Li B.; Li B.

收藏 | 浏览/下载：21/0 | 提交时间：2013/03/25

Nitrogen-doped ZnO thin films were grown on c-plane sapphire (Al 2O3) substrates via plasma-assisted molecular beam epitaxy using plasma activated nitric oxide (NO) as the oxygen source and dopant. X-ray diffraction measurements indicate that a small NO flux benefits the crystal quality of the thin films. Hall effect measurements indicate that the electron density of the ZnO films decreases gradually with decreasing NO flux and the conduction reverses to p-type at a certain flux. Optical emission spectra indicate that the N atom content in the NO plasma increases with decreasing NO flux and the origin of this is discussed. X-ray photoelectron spectroscopy measurements demonstrate that the number of N atom occupied O sites in the ZnO lattice increases correspondingly. 2011 American Institute of Physics.

Growth and spectroscopic characterisation of Er(3+):Sr(3)La(2)(BO(3))(4) crystal 期刊论文 OAI收割
Materials Research Innovations, 2009, 卷号: 13, 期号: 2, 页码: 116-118
H. F. Zhou, Y. S. Huang and G. F. Wang

收藏 | 浏览/下载：20/0 | 提交时间：2012/11/06

Emission spectra Erbium-doped crystal Crystal growth Laser crystal rare-earth ions optical spectroscopy stimulated-emission er3+ ions intensities absorption