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• 合肥物质科学研究院 [15]
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• 高能物理研究所 [5]
• 长春光学精密机械与物... [3]
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• OAI收割 [50]
• iSwitch采集 [1]

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• 期刊论文 [47]
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• 2022 [3]
• 2020 [4]
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• Chemistry [4]
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筛选

浏览/检索结果: 共51条，第1-10条 帮助 条数/页： 5101520253035404550556065707580859095100 排序方式： 请选择题名升序题名降序提交时间升序提交时间降序作者升序作者降序发表日期升序发表日期降序 Optimization design of sphere-tube-coupled photoacoustic cell and application of nitrogen dioxide detection 期刊论文  OAI收割 MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, 2022 作者:  Li, Zhengang;  Liu, Jiaxiang;  Si, Ganshang;  Ning, Zhiqiang;  Fang, Yonghua   |  收藏  |  浏览/下载：42/0  |  提交时间：2022/12/23 finite element simulation  minimum detection limit  photoacoustic spectroscopy  response capacity  sphere-tube-coupled photoacoustic cell   Qualitative analysis of gas detection limit of Fourier infrared spectroscopy br 期刊论文  OAI收割 ACTA PHYSICA SINICA, 2022, 卷号: 71 作者:  Wang Yu-Hao;  Liu Jian-Guo;  Xu Liang;  Cheng Xiao-Xiao;  Deng Ya-Song   |  收藏  |  浏览/下载：30/0  |  提交时间：2022/12/23 Fourier transform infrared spectroscopy  spectral simulation  detection limit  greenhouse gas   Optimization of focusing position in laser induced breakdown spectroscopy system based on quantitative analysis internal standard method of steel 会议论文  OAI收割 Kunming, China, 2021-12-07 作者:  Li, Zhicong;  Yang, Jianfeng;  Wang, Zhiyuan;  Zhao, Yiyi;  Huang, Shuaidong   |  收藏  |  浏览/下载：48/0  |  提交时间：2022/04/27 Laser induced breakdown spectroscopy(LIBS)  Quantitative analysis  Focus position  Detection sensitivity  Limit of detection(LOD)   Application of White Noise Perturbation in Wavelength Modulated Off-Axis Integrated Cavity Spectroscopy 期刊论文  OAI收割 SPECTROSCOPY AND SPECTRAL ANALYSIS, 2020, 卷号: 40 作者:  Wang Jing-jing;  Dong Yang;  Tian Xing;  Chen Jia-jin;  Tan Tu   |  收藏  |  浏览/下载：120/0  |  提交时间：2020/11/30 Off-axis integrated cavity output spectroscopy  Wavelength modulation  RF white noise  Cavity mode noise  Detection limit   Fully Integrated Photoacoustic NO2 Sensor for Sub-ppb Level Measurement 期刊论文  OAI收割 SENSORS, 2020, 卷号: 20 作者:  Dong, Yang;  Gu, Mingsi;  Zhu, Gongdong;  Tan, Tu;  Liu, Kun   |  收藏  |  浏览/下载：24/0  |  提交时间：2020/11/26 nitrogen dioxide  photoacoustic spectroscopy  integrated sensor  detection limit   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   |  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 distances1-3. It has long been speculated that magnetars are the engine powering repeating bursts from FRB sources4-13, 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 flare18-21. 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   |  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 AJ = 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 RNIR ? 0.025 (fluence index ?0.35).   Accuracy Assessment of the Planar Morphology of Valley Bank Gullies Extracted with High Resolution Remote Sensing Imagery on the Loess Plateau, China 期刊论文  OAI收割 INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH, 2019, 卷号: 16, 期号: 3, 页码: 19 作者:  Chen, Yixian;  Jiao, Juying;  Wei, Yanhong;  Zhao, Hengkang;  Yu, Weijie   |  收藏  |  浏览/下载：70/0  |  提交时间：2019/05/22 valley bank gully  Pleiades imagery  visual interpretation  accuracy assessing standard  gully detection limit  gully dimensions  vegetation cover  gully shape complexity  broken topography   On the Performance of an Aerosol Electrometer with Enhanced Detection Limit 期刊论文  OAI收割 SENSORS, 2018, 卷号: 18, 期号: 11, 页码: 13 作者:  Yang, Yixin;  Yu, Tongzhu;  Zhang, Jiaoshi;  Wang, Jian;  Wang, Wenyu   |  收藏  |  浏览/下载：85/0  |  提交时间：2019/12/25 aerosol electrometer  sub-femtoamp noise  detection efficiency  low detection limit   Laser Induced Breakdown Spectroscopy for Comparative Quantitative Analysis of Betel Leaves from Pakistan 期刊论文  OAI收割 SPECTROSCOPY AND SPECTRAL ANALYSIS, 2018, 卷号: 38, 期号: 10, 页码: 3295-3302 作者:     |  收藏  |  浏览/下载：46/0  |  提交时间：2018/12/17 Laser induced breakdown spectroscopy (LIBS)  Spectral analysis  Inductively coupled plasma-optical emission spectrometry  Limit of detection (LOD)