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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).

Gas chromatographic analysis of naturally occurring cannabinoids: A review of literature published during the past decade 期刊论文 OAI收割
PHYTOCHEMICAL ANALYSIS, 2019, 页码: 12
作者: Nahar, Lutfun; Guo, Mingquan; Sarker, Satyajit D.

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收藏 | 浏览/下载：30/0 | 提交时间：2019/10/17

Cannabis sativa cannabinoids gas chromatography (GC) cannabis marijuana GC-MS GC-FID analysis detection

The bridge between thin layer chromatography-mass spectrometry and high-performance liquid chromatography-mass spectrometry: The realization of liquid thin layer chromatography-mass spectrometry (LTLC-MS) 期刊论文 OAI收割
JOURNAL OF CHROMATOGRAPHY A, 2016, 卷号: 1460, 页码: 181-189
作者: Li, Yafeng; Wang, Jianing; Zhan, Lingpeng; Wleklinski, Michael; Wang, Jiyun

收藏 | 浏览/下载：43/0 | 提交时间：2016/12/29

Interface of MS and TLC Ambient ionization Pencil mark On-line separation and detection Reaction monitoring Glow discharge ionization

Multiple ligand detection and affinity measurement by ultrafiltration and mass spectrometry analysis applied to fragment mixture screening 期刊论文 OAI收割
ANALYTICA CHIMICA ACTA, 2015, 卷号: 886, 页码: 98-106
作者: Qin, Shanshan; Ren, Yiran; Fu, Xu; Shen, Jie; Chen, Xin

收藏 | 浏览/下载：50/0 | 提交时间：2016/06/23

Ultrafiltration-LC/MS Multiple ligand detection Affinity measurement Fragment library screening NS5B

Enhanced Multi-phosphopeptide Enrichment and Nano LC-ESI-qTOE-MS Detection Strategy Using Click OEG-CD Matrix 期刊论文 OAI收割
chemical research in chinese universities, 2015, 卷号: 31, 期号: 1, 页码: 44-52
作者: Zhao Yanyan; Wang Liheng; Guo Zhimou; Chi Xiaofei

收藏 | 浏览/下载：21/0 | 提交时间：2015/11/17

Click OEG-CD[olio(ethylene glycol)(OEG) linked beta-cyclodextrin(CD)] matrix Multi-phosphopeptide enrichment MS detection

Graphene-based nanoprobes for molecular diagnostics 期刊论文 OAI收割
ANALYST, 2015, 卷号: 140, 期号: 19, 页码: 6439—6451
作者: Chen, SX; Li, FW; Fan, CH; Song, SP

收藏 | 浏览/下载：23/0 | 提交时间：2016/03/04

GLASSY-CARBON ELECTRODE FIELD-EFFECT TRANSISTOR COBALT OXIDE NANOPARTICLES LABEL-FREE DETECTION MALDI-TOF MS FUNCTIONALIZED GRAPHENE QUANTUM DOTS CANCER-CELLS ELECTROCHEMICAL IMMUNOASSAY SELECTIVE DETECTION

Rapid, Selective, and Sensitive Analysis of Triterpenic Acids in Hippophae rhamnoides L. Using HPLC with Pre-Column Fluorescent Derivatization and Identification with Post-Column APCI-MS 期刊论文 OAI收割
journal of liquid chromatography & related technologies, 2015, 卷号: 38, 期号: 4, 页码: 451-458
作者: Hu, N; Suo, YR; Zhang, QL; You, JM; Ji, ZY

收藏 | 浏览/下载：37/0 | 提交时间：2015/12/17

APCI-MS HPLC triterpenic acids fluorescence detection pre-column derivatization Hippophae rhamnoides L.

Development of ultrasonic-assisted closed in-syringe extraction and derivatization for the determination of labile abietic acid and dehydroabietic acid in cosmetics 期刊论文 OAI收割
journal of chromatography a, 2014, 卷号: 1371, 页码: 20-29
作者: Liu, Jianjun; Liu, Mengge; Li, Xiu; Lu, Xiaomin; Chen, Guang

收藏 | 浏览/下载：133/0 | 提交时间：2016/12/21

Abietic acid (AA) Dehydroabietic acid (DHAA) Ultrasonic-assisted closed in-syringe extraction and derivatization (UCSED) High performance liquid chromatography-fluorescence detection-tandem mass spectra (HPLC-FLD-MS/MS) Cosmetic

DETERMINATION OF FREE FATTY ACIDS IN CORTEX LYCII BY HIGH-PERFORMANCE LIQUID CHROMATOGRAPHY MASS SPECTROMETRY WITH FLUORESCENCE DETECTION AND ATMOSPHERIC PRESSURE CHEMICAL IONIZATION IDENTIFICATION 期刊论文 OAI收割
journal of liquid chromatography & related technologies, 2014, 卷号: 37, 期号: 11, 页码: 1548-1557
作者: Chen, Xiangming; Dong, Xiuli; Suo, Yourui; You, Jinmao

收藏 | 浏览/下载：25/0 | 提交时间：2014/12/19

Cortex Lycii pre-column derivatization fatty acids HPLC/MS fluorescence detection

Highly Sensitive Visual Detection of Copper Ions Based on the Shape-Dependent LSPR Spectroscopy of Gold Nanorods 期刊论文 OAI收割
LANGMUIR, 2014, 卷号: 30, 期号: 12, 页码: 3625-3630
作者: Zhang, Zhiyang; Chen, Zhaopeng; Qu, Chengli; Chen, Lingxin

收藏 | 浏览/下载：30/0 | 提交时间：2015/07/31

SELF-ASSEMBLED MONOLAYERS COLORIMETRIC DETECTION ELECTROCHEMICAL DETERMINATION QUANTUM DOTS CLICK CHEMISTRY ICP-MS NANOPARTICLES MERCURY ELECTRODE WATER