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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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.

奇异核（~(12,14)Be、~8B）核物质密度分布的提取及其应用 学位论文 OAI收割
博士: 中国科学院研究生院（上海应用物理研究所）, 2014
蔡晓鹭

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12 14Be 8B 核反应截面核物质密度分布 Glauber模型退激分支比 189Os SSRF

A method for determination of the s orbital component of Be-12 ground state 期刊论文 OAI收割
NUCLEAR SCIENCE AND TECHNIQUES, 2014, 卷号: 25, 期号: 2
Cai, XL; Fan, GW; Xu, HH; An, ZD; Fan, GT; Xu, BJ; Li, YJ; Pan, QY; Yan, Z; Xu, W

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REACTION CROSS-SECTIONS NEUTRON-RICH NUCLEI HEAVY-ION COLLISIONS LIGHT-NUCLEI INTERMEDIATE ENERGIES DENSITY DISTRIBUTION LINE HALO BE-12 ISOTOPE BE-14

Attempt to probe nuclear charge radii by cluster and proton emissions 期刊论文 OAI收割
PHYSICAL REVIEW C, 2013, 卷号: 87, 期号: 5, 页码: 54323
Qian, YB; Ren, ZZ; Ni, DD

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DEFORMED-NUCLEI CROSS-SECTIONS HALO NUCLEI STATE DECAY RADIOACTIVITY SCATTERING EMITTERS LI-11 BE-14

Correction of baseline drifts due to the pressure changes between attenuated total reflection prism and human skin for noninvasive blood glucose sensing with Fourier Transform infrared spectroscopy (EI CONFERENCE) 会议论文 OAI收割
2011 International Conference on Smart Materials and Nanotechnology in Engineering, SMNE 2011, September 17, 2011 - September 18, 2011, Wuhan, China
作者: Wang D.

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For noninvasive blood sensing with attenuated total reflection (ATR)-Fourier Transform infrared spectroscopy(FTIR) the baseline of spectra human skin will drift because of the exitence of pressure changes between ATR prism and human skin. To correct the baseline drifts In the paper the fingertips spectra in mid-infrared were recorded under the special conditions. A line equation was calculated using the last 14 spectra coupled with the linear regression analysis between the absorbance spectra at the 1035cm-1 and the 950cm-1. And the corrected absorption intensities after the removal of the baseline drifts can be applied for the quantification of glucose concentrations in blood easily with the given method in the paper. (2012) Trans Tech Publications Switzerland.

Experimental study on formability of bulk metallic glass as mold for microstructure replication (EI CONFERENCE) 会议论文 OAI收割
作者: Liu J.; Lin J.; Huang Y.; Liu J.; Liu J.

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La62Al14Cu12Ni12BMG is introduced as a substitute for silicon which was widely used as mold material for nanofabrication. For the purpose of precise microstructure replication and complete filling effects of various imprint parameters including imprint temperature imprint time and compression load on formability of La 62Al14Cu12Ni12BMG are studied and discussed. Scanning electron microscope images and results of thermal analysis are used to characterize the filling effect of La62Al 14Cu12Ni12BMG. In particular correlations between time and thermodynamic properties are presented. Despite of its high viscosity at crystallization temperature and its narrow supercooled liquid region La62Al14Cu12Ni12BMG is proved to be a durable and promising material which can precisely replicate the patterns of silicon mold and then transfer its own patterns on Ce 69Al10Cu20Co1BMG and PMMA. 2012 Elsevier B.V. All rights reserved.

Preparation, microstructure and deformation behavior of Zr-based metallic glass/porous SiC interpenetrating phase composites 期刊论文 OAI收割
Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing, 2011, 卷号: 530, 页码: 15-20
Y. L. Chen; A. M. Wang; H. M. Fu; Z. W. Zhu; H. F. Zhang; Z. Q. Hu; L. Wang; H. W. Cheng

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Composite materials Metallic glasses Porous preforms Mechanical properties Fracture behavior glass-matrix-composites mechanical-properties pressureless infiltration fracture-behavior failure behavior forming alloy tungsten ceramics zr41ti14cu12ni10be23 preforms

The deviation of color matching algorithm in the field of full-color LED display (EI CONFERENCE) 会议论文 OAI收割
2009 2nd International Congress on Image and Signal Processing, CISP'09, October 17, 2009 - October 19, 2009, Tianjin, China
作者: Wang Y.; Chen Y.; Zhang X.; Zhang X.; Zhang X.

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In this paper a color gamut transformation method which transformed the different color gamut into a same one has been proposed. In the transforming process the deviation which was arose from the quantization error and the truncation error were existing. If the deviation was out of the color tolerance the uniformity of the screen color will be deteriorated. Firstly the color tolerance of vision was calculated by the color-difference formula. Secondly in the full-color LED display experiments it was analyzed that the tri -color tolerance values are respectively 2.5 2.8 and 1.3. According to the tri -color tolerance values and the color difference formula the express of the quantization precision gray value and the color difference was set up. Finally the gray-scale range of the color uniformity was analyzed by the collected data it was concluded that the uniformity of the display was satisfied the requirement of the visual when the range of the gray level was [11 14] and when the range was [1 11] the value of the color difference was also reduced significantly. 2009 IEEE.

丰中子奇异核17B的实验研究 期刊论文 OAI收割
物理学报, 2008, 卷号: 57, 期号: 5, 页码: 2866-2870
Hu, ZG (Hu Zheng-Guo); Wang, M (Wang Meng); Xu, HS (Xu Hu-Shan); Sun, ZY (Sun Zhi-Yu); Wang, JS (Wang Jian-Song); Xiao, GQ (Xiao Guo-Qing); Zhan, WL (Zhan Wen-Long); Xiao, ZG (Xiao Zhi-Gang); Mao, RS (Mao Rui-Shi); Zhang, HB (Zhang Hong-Bin); Zhao, TC (Zhao Tie-Cheng); Xu, ZG (Xu Zhi-Guo); Wang, Y (Wang Yue); Chen, RF (Chen Ruo-Fu); Huang, TH (Huang Tian-Heng); Gao, H (Gao Hui); Jia, F (Jia Fei); Fu, F (Fu Fen); Han, JL (Han Jian-Long); Zhang, XH (Zhang Xue-Heng); Zheng, C (Zheng Chuan); Yu, YH (Yu Yu-Hong); Fan, RR (Fan Rui-Rui); Li, B (Li Bo); Guo, ZY (Guo Zhong-Yan)

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收藏 | 浏览/下载：26/0 | 提交时间：2010/10/29

Reaction Cross-section Model Radii Ribll Be-14

Review of Holocene glacial chronologies based on radiocarbon dating in Tibet and its surrounding mountains 期刊论文 OAI收割
JOURNAL OF QUATERNARY SCIENCE, 2008, 卷号: 23, 期号: 6-7, 页码: 533-543
作者: Yi CL(易潮路)

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LATE QUATERNARY GLACIATION LATE PLEISTOCENE WESTERN TIBET HIMALAYA NEPAL MORAINES VALLEY BE-10 C-14 FLUCTUATIONS