CORC

在结果中检索

CORC

浏览/检索结果: 共76条，第1-10条 帮助

已选(0)清除 条数/页：   排序方式：
New age constraints on the Lower Cretaceous Jiufengshan Formation of Inner Mongolia, China and their implications for the spatiotemporal development of the Jehol Biota 期刊论文
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY, 2023, 卷号: 629, 页码: 12
作者:  Li, Yuling;  Zheng, Daran;  Li, Xiaobo;  Teng, Xiao;  Zhang, Qianqi
收藏  |  浏览/下载：23/0  |  提交时间：2023/10/24
Detection of two bright radio bursts from magnetar SGR 1935 + 2154 期刊论文
Nature Astronomy, 2021, 卷号: 5, 页码: 414
作者:  Kirsten, F.;  Snelders, M. P.;  Jenkins, M.;  Nimmo, K.;  van den Eijnden, J.
收藏  |  浏览/下载：46/0  |  提交时间：2021/11/18
Astrophysics - High Energy Astrophysical Phenomena  Abstract: Fast radio bursts are millisecond-duration, bright radio signals (fluence 0.1-100 Jy ms) emitted from extragalactic sources of unknown physical origin. The recent CHIME/FRB and STARE2 detection of an extremely bright (fluence ~MJy ms) radio burst from the Galactic magnetar SGR 1935+2154 supports the hypothesis that (at least some) fast radio bursts are emitted by magnetars at cosmological distances. In follow-up observations totalling 522.7 h on source, we detect two bright radio bursts with fluences of 112 ± 22 Jy ms and 24 ± 5 Jy ms, respectively. Both bursts appear to be affected by interstellar scattering and we measure significant linear and circular polarization for the fainter burst. The bursts are separated in time by ~1.4 s, suggesting a non-Poissonian, clustered emission processsimilar to those seen in some repeating fast radio bursts. Together with the burst reported by CHIME/FRB and STARE2, as well as a much fainter burst seen by FAST (fluence 60 mJy ms), our observations demonstrate that SGR 1935+2154 can produce bursts with apparent energies spanning roughly seven orders of magnitude, and that the burst rate is comparable across this range. This raises the question of whether these four bursts arise from similar physical processes, and whether the fast radio burst population distribution extends to very low energies (~1030 erg, isotropic equivalent).  
Genesis of Early Permian A-type granites in the middle of the Great Xing'an Range and constraints on tectonic evolution of the Zhalantun area 期刊论文
ACTA PETROLOGICA SINICA, 2020, 卷号: 36, 期号: 4, 页码: 1091-1106
作者:  Zhang Chao;  Wu XinWei;  Liu YongJiang;  Zhang YuJin;  Chao Zhang
收藏  |  浏览/下载：28/0  |  提交时间：2021/02/02
Genesis of Early Permian A-type granites in the middle of the Great Xing'an Range and constraints on tectonic evolution of the Zhalantun area 期刊论文
ACTA PETROLOGICA SINICA, 2020, 卷号: 36, 期号: 4, 页码: 1091-1106
作者:  Zhang Chao;  Wu XinWei;  Liu YongJiang;  Zhang YuJin;  Chao Zhang
收藏  |  浏览/下载：132/0  |  提交时间：2021/02/02
New evidence from the Wuliji'Oboo fluorite deposit for the role of the paleo-Pacific Plate and Mongol-Okhotsk suture in creating extensive fluorite mineralization in the Great Xing'an Range, NE China 期刊论文
GEOLOGICAL JOURNAL, 2019, 页码: 25
作者:  Zou, Hao;  Pirajno, Franco;  Zhang, Qiang;  Tessalina, Svetlana;  Ware, Bryant
收藏  |  浏览/下载：70/0  |  提交时间：2019/10/14
Recognition of Early Paleozoic Magmatisms in the Supposed Proterozoic Basements of Zhalantun, Great Xing'an Range, NE China 期刊论文
ACTA GEOLOGICA SINICA-ENGLISH EDITION, 2019, 卷号: 93, 期号: 5, 页码: 1434-1455
作者:  Qin Tao;  Guo Rongrong;  Zang Yanqing;  Qian Cheng;  Wang Yan
收藏  |  浏览/下载：63/0  |  提交时间：2021/02/02
食用蔬菜能吸收和积累微塑料 期刊论文
科学通报, 2019, 卷号: 64, 期号: 9, 页码: 928-934
作者:  李连祯;  周倩;  尹娜;  涂晨;  骆永明
收藏  |  浏览/下载：63/0  |  提交时间：2020/06/17
微塑料  生菜  聚苯乙烯微球  吸收  积累  健康风险  microplastics  lettuce  polystyrene microbeads  uptake  accumulation  human health risk  Microplastic (MP, 100 nm-5 mm) may present an attributable risk to ecosystem and human health, and its pollution has become a global environmental concern. Despite a wealth of information on the accumulation of MPs in aquatic species, there is no information on the uptake and accumulation of MPs by higher plants. Terrestrial edible plants are directly exposed to MPs when agricultural soil was applied with organic manure, sewage sludge as fertilizer or plastic mulching. In this paper, the uptake of two sizes of polystyrene (PS) microbeads (0.2 and 1.0 mum) and then their distribution and migration in an edible plant lettuce were firstly investigated based on laboratory experiments. We used fluorescent markers to track PS microbeads in plant tissues and found fluorescence to be a sensitive and reliable detection method. Sections from untreated control lettuce showed no autofluorescence. When roots were treated with fluorescently labeled PS microbeads, the microbeads could be identified by its fluorescence. Our main study investigated the uptake of 0.2 mum beads, as few luminescence signals were observed in lettuce roots for 1.0 mum beads in our experiment. We observed that 0.2 mum fluorescent microbeads were extracellularly trapped in the root cap mucilage (which is a highly hydrated polysaccharide) and a dark green tip (which was typical of lettuce roots exposed to label PS beads) was usually visible to the naked eye. Confocal images revealed that the PS luminescence signals were mainly located in the vascular system and on the cell walls of the cortex tissue of the roots, indicated that the beads passed through the intercellular space via the apoplastic transport system. Once inside the central cylinder, the 0.2 mum PS beads were transferred from the roots to the stems and leaves via the vascular system following the transpiration stream. We also observed that the PS beads adhered to one another and self-assembled systematically into grape-like and (chain) string-like clusters in the intercellular space of the root and stem vascular tissue of lettuce plant. In contrast to the root and stem, PS beads were dispersed in the leaf tissue. Here, for the first time we provide evidence of the adherence, uptake, accumulation, and translocation of submicrometer MPs within an edible plant. Our findings highlight the previously underappreciated human exposure pathway to MPs through the consumption of contaminated crops and emphasize the need for new management strategies to control the release of MPs waste products into the terrestrial environment. Ultimately, the potential impacts of low range sized MPs on food safety of crop plants and human health need to be urgently considered.  
Timing analysis of Swift J1658.2-4242's outburst in 2018 with Insight-HXMT, NICER and AstroSat 期刊论文
Journal of High Energy Astrophysics, 2019, 卷号: 24, 页码: 30-40
作者:  HXMT
收藏  |  浏览/下载：46/0  |  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.  
Middle Jurassic-Early Cretaceous tectonic evolution of the Bayanhushuo area, southern Great Xing'an Range, NE China: constraints from zircon U-Pb geochronological and geochemical data of volcanic and subvolcanic rocks 期刊论文
INTERNATIONAL GEOLOGY REVIEW, 2018, 卷号: 60, 期号: 15, 页码: 1883-1905
作者:  Guan, Qing-Bin;  Liu, Zheng-Hong;  Wang, Bin;  Wang, Xiong;  Wang, Xing-An
收藏  |  浏览/下载：28/0  |  提交时间：2019/08/27
Middle Jurassic-Early Cretaceous tectonic evolution of the Bayanhushuo area, southern Great Xing'an Range, NE China: constraints from zircon U-Pb geochronological and geochemical data of volcanic and subvolcanic rocks 期刊论文
INTERNATIONAL GEOLOGY REVIEW, 2018, 卷号: 60, 期号: 15, 页码: 1883-1905
作者:  Guan, Qing-Bin;  Liu, Zheng-Hong;  Wang, Bin;  Wang, Xiong;  Wang, Xing-An
收藏  |  浏览/下载：41/0  |  提交时间：2018/12/21

©版权所有 ©2017 CSpace - Powered by CSpace