中国科学院机构知识库网格系统: 检索

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：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.

Modeling the Origin of Anthropogenic Black Carbon and Its Climatic Effect Over the Tibetan Plateau and Surrounding Regions 期刊论文 iSwitch采集
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2018, 卷号: 123, 期号: 2, 页码: 671-692
作者: Yang, Junhua; Kang, Shichang; Ji, Zhenming; Chen, Deliang

收藏 | 浏览/下载：26/0 | 提交时间：2019/10/09

black carbon emission origin Tibetan Plateau South Asia transport process

Red carbon dots-based phosphors for white light-emitting diodes with color rendering index of 92 期刊论文 OAI收割
Journal of Colloid and Interface Science, 2018, 卷号: 528, 页码: 281-288
作者: Zhai, Y. C.; Wang, Y.; Li, D.; Zhou, D.; Jing, P. T.

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收藏 | 浏览/下载：16/0 | 提交时间：2019/09/17

Carbon dots Red emission Phosphors White light-emitting diodes High color rendering index graphene quantum dots state photoluminescence fluorescence efficient nanodots energy nanoparticles luminescence origin Chemistry

Medium scale anisotropy in the TeV cosmic ray flux observed by ARGO-YBJ 期刊论文 OAI收割
PHYSICAL REVIEW D, 2013, 卷号: 88, 期号: 8
作者: ARGO-YBJ Collaboration

收藏 | 浏览/下载：20/0 | 提交时间：2015/12/02

EXTRAGALACTIC MAGNETIC-FIELDS MILAGRO HOT-SPOTS GAMMA-RAYS INTERSTELLAR DETECTOR CALIBRATION SUPERNOVA EMISSION ORIGIN REGION

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：20/0 | 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.

Study on the separation of 100 TeV γ-rays from cosmic rays for the Tibet ASγ experiment 期刊论文 OAI收割
中国物理C, 2011, 期号: 2, 页码: 153-157
作者: Feng CY(冯朝阳); Zhang Y(张毅); Liu C(刘成); Fan C(樊超); Li HC(李红超)

收藏 | 浏览/下载：18/0 | 提交时间：2015/12/15

origin of cosmic rays 100 TeV γ-rays emission Tibet ASγ experiment NKG-function

Study on the separation of 100 TeV gamma-rays from cosmic rays for the Tibet AS gamma experiment 期刊论文 OAI收割
CHINESE PHYSICS C, 2011, 卷号: 35, 期号: 2, 页码: #REF!
作者: Feng CY(冯朝阳); Zhang Y(张毅); Liu C(刘成); Fan C(樊超); Li HC(李红超)

收藏 | 浏览/下载：22/0 | 提交时间：2016/04/12

origin of cosmic rays 100 TeV gamma-rays emission Tibet AS gamma experiment NKG-function

Photoluminescence spectroscopy and positron annihilation spectroscopy probe of alloying and annealing effects in nonpolar m-plane ZnMgO thin films 期刊论文 OAI收割
applied physics letters, 2010, 卷号: 96, 期号: 15, 页码: art. no. 151904
作者: Jin P; Wei HY; Song HP

收藏 | 浏览/下载：194/32 | 提交时间：2010/05/04

alloying annealing electrical conductivity excitons II-VI semiconductors magnesium compounds MOCVD coatings photoluminescence positron annihilation semiconductor thin films vacancies (crystal) wide band gap semiconductors zinc compounds SEMICONDUCTORS EMISSION ORIGIN DIODES

Indium-Induced Effect on Polarized Electroluminescence from InGaN/GaN MQWs Light Emitting Diodes 期刊论文 OAI收割
chinese physics letters, 2009, 卷号: 26, 期号: 8, 页码: art. no. 087802
Ruan J; Yu TJ; Jia CY; Tao RC; Wang ZG; Zhang GY

收藏 | 浏览/下载：99/2 | 提交时间：2010/03/08

QUANTUM-WELL LASERS OPTICAL GAIN EMISSION GAN PHOTOLUMINESCENCE SEMICONDUCTORS LUMINESCENCE SPECTRA ORIGIN ENERGY

Improved color purity and efficiency in polyfluorene-based light-emitting diodes 期刊论文 OAI收割
materials science and engineering b-solid state materials for advanced technology, 2007, 卷号: 141, 期号: 1-2, 页码: 71-75
Chen ZY; Ma DG

收藏 | 浏览/下载：259/1 | 提交时间：2010/07/13

CONJUGATED POLYMERS DEFECT EMISSION BLUE EMISSION ELECTROLUMINESCENCE DEGRADATION INTERFACE OXIDATION EXCIMERS CALCIUM ORIGIN