中国科学院机构知识库网格系统: 检索

Quantitative analysis of the contribution of sources, diffusion pathways, and receptor attributes for the spatial distribution of soil heavy metals and their nested structure analysis in China 期刊论文 OAI收割
SCIENCE OF THE TOTAL ENVIRONMENT, 2023, 卷号: 882, 页码: 13
作者: Qiao, Pengwei; Wang, Shuo; Li, Jiabin; Shan, Yue; Wei, Yan

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Soil heavy metals Pollution level Source apportionment In fluence law Nested semivariogram National scope

Microseismic source location imaging using in-well distributed fiber-optic monitoring data during horizontal well fracturing in shale gas reservoir 期刊论文 OAI收割
CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION, 2022, 卷号: 65, 期号: 12, 页码: 4846-4857
作者: Liang Xing; Wang YiBo; Wu ShaoJiang; Liang EnMao; Shi ShuYou

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收藏 | 浏览/下载：48/0 | 提交时间：2023/03/31

Shale gas reservoir Hydraulic fracturing Fiber-optic Distributed Acoustic Sensing In-well monitoring Micro-vibration Microseismic source location imaging

Geochronology, source features and the characteristics of fractional crystallization in pegmatite at the Qongjiagang giant pegmatite -type lithium deposit, Himalaya, Tibet 期刊论文 OAI收割
ACTA PETROLOGICA SINICA, 2021, 卷号: 37, 期号: 11, 页码: 3325-3347
作者: Zhao JunXing; He ChangTong; Qin KeZhang; Shi RuiZhe; Liu XiaoChi

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收藏 | 浏览/下载：42/0 | 提交时间：2022/07/05

Qongjiagang lithium deposit Internal zonation patterns of pegmatite U-Pb dating of monazite and columbite group minerals Source features Regional mineralization in the Himalayan leucogranite belt

Cobalt concentration in a sulfidic sea and mobilization during orogenesis: Implications for targeting epigenetic sediment-hosted Cu-Co deposits 期刊论文 OAI收割
GEOCHIMICA ET COSMOCHIMICA ACTA, 2021, 卷号: 305, 页码: 1-18
作者: Qiu, Zheng-Jie; Fan, Hong-Rui; Goldfarb, Richard; Tomkins, Andrew G.; Yang, Kui-Feng

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收藏 | 浏览/下载：93/0 | 提交时间：2021/10/25

Cobalt source Sediment-hosted Cu-Co deposit Great oxygenation event Sulfidic sea In situ Fe-S isotope

Strontium isotopes in high- and low-Ge coals from the Shengli Coalfield, Inner Mongolia, northern China: New indicators for Ge source 期刊论文 OAI收割
INTERNATIONAL JOURNAL OF COAL GEOLOGY, 2021, 卷号: 233, 页码: 11
作者: Liu, Jingjing; Spiro, Baruch F.; Dai, Shifeng; French, David; Graham, Ian T.

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收藏 | 浏览/下载：54/0 | 提交时间：2021/10/08

Germanium in coal Strontium isotopes Wulantuga Ge deposit Grantic Ge source

Highly selective monitoring of in-source fragmentation sapogenin product ions in positive mode enabling group-target ginsenosides profiling and simultaneous identification of seven Panax herbal medicines 期刊论文 OAI收割
JOURNAL OF CHROMATOGRAPHY A, 2020, 卷号: 1618, 页码: 11
作者: Zhang, Chun-xia; Wang, Xiao-yan; Lin, Zhao-zhou; Wang, Hong-da; Qian, Yue-xin

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In-source fragmentation Ginsenoside Selective ion monitoring Characteristic chromatogram Panax Traditional Chinese medicine formula

Mercury and in situ sulfur isotopes as constraints on the metal and sulfur sources for the world’s largest Sb deposit at Xikuangshan, southern China 期刊论文 OAI收割
Mineralium Deposita, Mineralium Deposita, 2020, 2020, 卷号: 55, 55, 页码: 1353–1364, 1353–1364
作者: Shanling Fu; Ruizhong Hu; Runsheng Yin; Jun Yan; Xifeng Mi

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收藏 | 浏览/下载：49/0 | 提交时间：2020/10/19

Hg Isotopes Hg Isotopes in Situ Sulfur Isotopes source Of Ore Metals xikuangshan Sb Deposit in Situ Sulfur Isotopes source Of Ore Metals xikuangshan Sb Deposit

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.

Introducing a special collection of papers in the Journal of High Energy Astrophysics on the Early Results of China's 1st X-ray Astronomy Satellite: Insight-HXMT 期刊论文 OAI收割
Journal of High Energy Astrophysics, 2020, 卷号: 27, 页码: 51-52
作者: HXMT

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Astrophysics - High Energy Astrophysical Phenomena Abstract: Insight-HXMT is the first Chinese X-ray astronomical mission, launched successfully on June 15, 2017, from China's Jiuquan Satellite Launch Center. Insight-HXMT was designed to have a broad energy coverage in X-rays, from 1-250 keV, with excellent timing and adequate energy resolution at soft X-rays, and the largest effective area at hard X-rays. This allows, in particular, to observe bright sources like X-ray binaries (XRBs) in their bright/outburst states with high cadence and high statistics at hard and soft X-rays at once. It was then expected that the Insight-HXMT mission will bring us new insights regarding the characteristics of several source classes. Examples include characterizing High-Mass X-ray Binaries (HMXBs) and the outburst evolution of Low-Mass X-ray Binaries (LMXBs). For instance, in HMXB systems, the region around their Alfven radius that is responsible to determine whether accretion or propeller occurs, or the region around the NS magnetic pole where the intense X-rays are supposed to be produced are specially appealing targets of study. For the LMXBs, the evolution the outburst and the properties of the compact objects themselves are obvious priority targets for Insight-HXMT. Due to the broad coverage in energy, Insight-HXMT is specially well suited to study the influence of thermonuclear (type-I) X-ray bursts upon the surrounding environment.

Insight-HXMT observations of Swift J0243.6+6124: the evolution of RMS pulse fractions at super-Eddington luminosity 期刊论文 OAI收割
Monthly Notices of the Royal Astronomical Society, 2020, 卷号: 497, 页码: 5498-5506
作者: HXMT

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stars: neutron pulsars: individual: Swift J0243.6+6124 X-rays: binaries Astrophysics - High Energy Astrophysical Phenomena Abstract: Based on Insight-HXMT data, we report on the pulse fraction evolution during the 2017-2018 outburst of the newly discovered first Galactic ultraluminous X-ray (ULX) source Swift J0243.6+6124. The pulse fractions of 19 observation pairs selected in the rising and fading phases with similar luminosity are investigated. The results show a general trend of the pulse fraction increasing with luminosity and energy at supercritical luminosity. However, the relative strength of the pulsation between each pair evolves strongly with luminosity. The pulse fraction in the rising phase is larger at luminosity below 7.71 × 10³⁸ erg s^-1, but smaller at above. A transition luminosity is found to be energy independent. Such a phenomenon is first confirmed by Insight-HXMT observations and we speculate that it may have relation with the radiation-pressure-dominated accretion disc.