中国科学院机构知识库网格系统: 检索

Soil organic matter content prediction using Vis-NIRS based on different wavelength optimization algorithms and inversion models 期刊论文 OAI收割
JOURNAL OF SOILS AND SEDIMENTS, 2023, 卷号: N/A
作者: Zhou, Wei; Xiao, Jieyun; Li, Haoran; Chen, Qi; Wang, Ting

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收藏 | 浏览/下载：17/0 | 提交时间：2023/05/06

Soil organic matter Visible near-infrared spectroscopy Competitive adaptive reweighted sampling Random forest Three-rivers source region

A Near-Source Electromagnetic Method for Deep Ore Explorations 期刊论文 OAI收割
MINERALS, 2022, 卷号: 12, 期号: 10, 页码: 10
作者: Xue, Guoqiang; Chen, Weiying; Wu, Xin; Yan, Shu; Guo, Wenbo

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收藏 | 浏览/下载：33/0 | 提交时间：2023/03/31

grounded-wire source transient electromagnetics short-offset near source deep ore exploration

Influence of the Seismic Wave Velocity of the Damage Zone on Near-Field Ground Motions 期刊论文 OAI收割
FRONTIERS IN EARTH SCIENCE, 2021, 卷号: 9, 页码: 13
作者: Wang, Qiankuan; Qiu, Shili; Cheng, Yao; Li, Ping; Kou, Yongyuan

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收藏 | 浏览/下载：49/0 | 提交时间：2022/02/17

underground engineering seismic hazard near-field ground motion excavation damage zone excavation fracture zone finite fracturing seismic source model

Active source seismic imaging on near-surface granite body: case study of siting a geological disposal repository for high-level radioactive nuclear waste 期刊论文 OAI收割
PETROLEUM SCIENCE, 2021, 页码: 16
作者: Li, Wen; Liu, Yi-Ke; Chen, Yong; Liu, Bao-Jin; Feng, Shao-Ying

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收藏 | 浏览/下载：56/0 | 提交时间：2021/10/25

Geological disposal repository Nuclear waste Granite body Active source seismic exploration Near-surface velocity inversion

Effective hydrocarbon-bearing geological conditions of the Permian strata in the South Yellow Sea Basin, China: Evidence from borehole CSDP-2 期刊论文 OAI收割
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING, 2021, 卷号: 196, 页码: 21
作者: Cai, Laixing; Zhang, Xunhua; Guo, Xingwei; Zeng, Zhigang; Xiao, Guolin

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收藏 | 浏览/下载：105/0 | 提交时间：2021/04/21

Source rocks Tight sandstones Near-source accumulation Favorable Permian Borehole CSDP-2 South Yellow sea basin

New insights into marine hydrocarbon geological conditions in the South Yellow Sea Basin:evidence from borehole CSDP-2 CNKI期刊论文 OAI收割
2020
作者: CAI Laixing; XIAO Guolin; ZENG Zhigang; ZHANG Xunhua; GUO Xingwei

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收藏 | 浏览/下载：5/0 | 提交时间：2024/12/18

hydrocarbon geological conditions near-source accumulation relay hydrocarbon generation multistage accumulation favorable Permian South Yellow Sea Basin borehole CSDP-2

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：27/0 | 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).

The application of sterane in the oil-sources correlation of near-source and multi-source: a case study of CH-8 oil reservoir in Central Ordos Basin, China 期刊论文 iSwitch采集
PETROLEUM SCIENCE AND TECHNOLOGY, 2019, 卷号: 37, 期号: 6, 页码: 701-709
作者: Mou, Weiwei; Zhang, Zhongyi; Li, Shixiang; Yan, Cancan; Guo, Ruiliang

收藏 | 浏览/下载：58/0 | 提交时间：2019/10/08

oil-source rock correlation sterane near-source multi-source CH-8 oil reservoir

Timing analysis of Swift J1658.2-4242's outburst in 2018 with Insight-HXMT, NICER and AstroSat 期刊论文 OAI收割
Journal of High Energy Astrophysics, 2019, 卷号: 24, 页码: 30-40
作者: HXMT

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收藏 | 浏览/下载：61/0 | 提交时间：2022/02/08

Accretion accretion disks Black hole physics X-rays: binaries: Swift J1658.2-4242 Astrophysics - High Energy Astrophysical Phenomena Abstract: We present the observational results from a detailed timing analysis of the black hole candidate Swift J1658.2-4242 during its 2018 outburst with the observations of Hard X-ray Modulation Telescope (Insight-HXMT), Neutron Star Interior Composition Explorer (NICER) and AstroSat in 0.1-250 keV. The evolution of intensity, hardness and integrated fractional root mean square (rms) observed by Insight-HXMT and NICER are presented in this paper. Type-C quasi-periodic oscillations (QPOs) observed by NICER (0.8-3.5 Hz) and Insight-HXMT (1-1.6 Hz) are also reported in this work. The features of the QPOs are analyzed with an energy range of 0.5-50 keV. The relations between QPO frequency and other characteristics such as intensity, hardness and QPO rms are carefully studied. The timing and spectral properties indicate that Swift J1658.2-4242 is a black hole binary system. Besides, the rms spectra of the source calculated from the simultaneous observation of Insight-HXMT, NICER and AstroSat support the Lense-Thirring origin of the QPOs. The relation between QPO phase lag and the centroid frequency of Swift J1658.2-4242 reveals a near zero constant when < 4Hz and a soft phase lag at 6.68 Hz. This independence follows the same trend as the high inclination galactic black hole binaries such as MAXI J1659-152.

Review of the key techniques on short-offset electromagnetic detection 期刊论文 OAI收割
CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION, 2018, 卷号: 61, 期号: 1, 页码: 1-8
作者: He JiShan; Xue GuoQiang

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收藏 | 浏览/下载：39/0 | 提交时间：2018/09/26

Near-source Electromagnetic Prospecting Central-loop Tem Short-offset Tem Frequency-domain Sounding Wide Field Electromagnetic Method