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浏览/检索结果: 共82条，第1-10条 帮助

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An efficient, concise synthetic approach to γ-aminobutyric acid (GABA) derivatives bearing bicyclo[2.2.2]octane and bicyclo[2.2.1]heptane rings 期刊论文  OAI收割
SYNTHETIC COMMUNICATIONS, 2023, 页码: 10
作者:  Luo, Wen;  Cheng, Xinqiang;  Zhu, Xinyuan;  Li, Yong;  Liu, Yongjia
  |  收藏  |  浏览/下载：65/0  |  提交时间：2024/01/16
Design and Synthesis Studies of α-Methylene-γ-butyrolactones Antagonists of GPR52 期刊论文  OAI收割
CHINESE JOURNAL OF ORGANIC CHEMISTRY, 2023, 卷号: 43, 期号: 11, 页码: 3916-3929
作者:  Shen, Donghang;  Li, Xin;  Guo, Shimeng;  Xie, Xin;  Nan, Fajun
  |  收藏  |  浏览/下载：37/0  |  提交时间：2024/02/27
Screening and characterization of potent poly glutamic acid producing Bacillus sp. isolated from Kinema, water and soil samples 期刊论文  OAI收割
HELIYON, 2021, 卷号: 7, 期号: 8, 页码: -
作者:  Thapa, Punam;  Thapa, Alina;  Khadka, Sujan;  Sapkota, Sanjeep;  Panta, Om Prakash
  |  收藏  |  浏览/下载：16/0  |  提交时间：2021/12/23
On the Terrestrial Gamma Ray Flashes Preceding Narrow Bipolar Events 期刊论文  OAI收割
Geophysical Research Letters, 2021, 卷号: 48, 页码: e92160
作者:  HXMT
  |  收藏  |  浏览/下载：32/0  |  提交时间：2022/02/08
low frequency magnetic sferics  narrow bipolar events (NBEs)  relativistic feedback mechanism  Terrestrial Gamma ray Flashes (TGFs)  Abstract: Narrow bipolar events (NBEs) are occasionally reported to occur within a few ms after Terrestrial Gamma ray Flashes (TGFs), while the formation mechanism remains mysterious partially due to the lack of sufficient observations. Here, nine more TGFs of this scenario are reported with concurrent LF sferics and lightning location data. The gamma ray production in these TGFs preceded the occurrence of NBEs by a minimum of 60 µs up to 13.5 ms, and no other fast leader discharge was found within 20 ms before the TGF. The TGF preceded positive NBEs occurred at altitudes of 8.6-11 km in thunderstorms, likely in the high electric field (E field) region of lightning initiation. The analyses show that the NBE preceding TGFs bear harder energy spectrum with larger proportion of high energy photons than EIP related TGFs produced in association with lightning leader. Our findings support the relativistic feedback mechanism of gamma ray generation in the large scale thunderstorm E field.  
Controlled-synthesis of alumina-graphene oxide nanocomposite coupled with DNA/ sulfide fluorophore for eco-friendly "Turn off/on" H2S nanobiosensor 期刊论文  OAI收割
TALANTA, 2020, 卷号: 211, 页码: 11
作者:  Samak, Nadia A.;  Selim, Mohamed S.;  Hao, Zhifeng;  Xing, Jianmin
  |  收藏  |  浏览/下载：45/0  |  提交时间：2020/06/15
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：28/0  |  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).  
The Belle II Physics Book 期刊论文  OAI收割
PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS, 2019, 期号: 12, 页码: 123C01
作者:  Kou, E.;  Urquijo, P.;  Altmannshofer, W.;  Beaujean, F.;  Bell, G.
  |  收藏  |  浏览/下载：66/0  |  提交时间：2020/06/16
Alteration of S-adenosylhomocysteine levels affects lignin biosynthesis in switchgrass 期刊论文  OAI收割
PLANT BIOTECHNOLOGY JOURNAL, 2018, 卷号: 16, 期号: 12, 页码: 2016-2026
作者:  Bai, Zetao;  Qi, Tianxiong;  Liu, Yuchen;  Wu, Zhenying;  Ma, Lichao
  |  收藏  |  浏览/下载：140/0  |  提交时间：2018/12/21
Nonlocal Response in Infrared Detector with Semiconducting Carbon Nanotubes and Graphdiyne 期刊论文  OAI收割
ADVANCED SCIENCE, 2017, 卷号: 4, 期号: 12
作者:  Zheng, Zhe;  Fang, Hehai;  Liu, Dan;  Tan, Zhenjun;  Gao, Xin
  |  收藏  |  浏览/下载：81/0  |  提交时间：2019/04/09
Instrument performance and simulation verification of the polar detector 期刊论文  iSwitch采集
Nuclear instruments & methods in physics research section a-accelerators spectrometers detectors and associated equipment, 2017, 卷号: 872, 页码: 28-40
作者:  Kole, M.;  Li, Z. H.;  Produit, N.;  Tymieniecka, T.;  Zhang, J.
收藏  |  浏览/下载：64/0  |  提交时间：2019/04/23