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浏览/检索结果: 共10条，第1-10条 帮助

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Spatiotemporal Variation in the Meteorological Drought Comprehensive Index in the Beijing-Tianjin-Hebei Region during 1961-2023 期刊论文  OAI收割
WATER, 2023, 卷号: 15, 期号: 24, 页码: 16
作者:  Du, Wupeng;  Hao, Zhixin;  Bai, Mengxin;  Zhang, Liang;  Zhang, Chengpeng
  |  收藏  |  浏览/下载：17/0  |  提交时间：2024/02/05
Increased extreme drought events in south-central China since the last century:Evidence from oxygen isotope signatures preserved in tree ring cellulose 期刊论文  OAI收割
DENDROCHRONOLOGIA, 2022, 卷号: 74, 页码: 11
作者:  Zhao, Qingyu;  Xu, Chenxi;  An, Wenling;  Liu, Yucheng;  Guo, Zhengtang
  |  收藏  |  浏览/下载：53/0  |  提交时间：2022/07/19
Atmospheric measurements at Mt. Tai - Part I: HONO formation and its role in the oxidizing capacity of the upper boundary layer 期刊论文  OAI收割
ATMOSPHERIC CHEMISTRY AND PHYSICS, 2022, 卷号: 22, 期号: 5, 页码: 3149-3167
作者:  Xue, Chaoyang;  Ye, Can;  Kleffmann, Jorg;  Zhang, Chenglong;  Catoire, Valery
  |  收藏  |  浏览/下载：24/0  |  提交时间：2022/11/07
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
  |  收藏  |  浏览/下载：52/0  |  提交时间：2022/02/08
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.  
Early summer precipitation in the lower Yangtze River basin for AD 1845-2011 based on tree-ring cellulose oxygen isotopes 期刊论文  OAI收割
CLIMATE DYNAMICS, 2019, 卷号: 52, 期号: 3-4, 页码: 1583-1594
作者:  Xu, Chenxi;  Shi, Jiangfeng;  Zhao, Yesi;  Nakatsuka, Takeshi;  Sano, Masaki
  |  收藏  |  浏览/下载：95/0  |  提交时间：2019/04/18
烟台牟平海洋牧场季节性低氧对大型底栖动物群落的生态效应 期刊论文  OAI收割
生物多样性, 2019, 卷号: 27, 期号: 2, 页码: 200-210
作者:  李宝泉
  |  收藏  |  浏览/下载：21/0  |  提交时间：2020/06/17
低氧  群落结构  群落恢复  敏感种  机会种  hypoxia  community structure  community recovery  sensitive species  opportunistic species  Hypoxia is a common phenomenon in the world's oceans, especially in the shallow waters of coastal zones. Rates of hypoxia are increasing due to global climatic changes and anthropogenic activities. Hypoxia can cause mass mortality of marine animals and can have severe negative impacts on marine ecosystems. To better understand the effects of hypoxia on macrobenthic communities, a survey was carried out in the Muping Marine Ranch (Yantai) during June, August and September of 2016. Results showed that seasonal hypoxia led to changes in benthic community structure, especially in terms of species composition and dominant species. The dominant species were Polychaeta Lumbrinereis latreilli, Sternaspis scutata and Mollusca Endopleura lubrica in summer. The opportunistic species Lumbrinereis latreilli increased, whereas, sensitive species such as Leptomya minuta, Glycera chirori, Upogebia major, Pontocrates altamarimus, Eriopisella sechellensis decreased during the hypoxic period of August. Hypoxia also reduced biodiversity indices. The effect of hypoxia on abundance and biomass were not significant, mainly because of the increase in the opportunistic Lumbrinereis latreilli, which counteracted the decline in abundance and biomass of other species. Individual physiological tolerance to hypoxia was different among species. Lumbrinereis latreilli showed higher tolerance to hypoxia in dissolved oxygen (DO) = 1.0 mg/L compared to other species. Some sensitive species, such as Leptomya minuta, Upogebia major, Pontocrates altamarimus and Eriopisella sechellensis showed lower tolerance when DO < 2.5 mg/L. When DO increased to 2.5 mg/L, the macrobenthic community start to recover gradually. The recovery extent and time needed were closely related to the degree of seasonal hypoxia.  
In-orbit Demonstration of X-Ray Pulsar Navigation with the Insight-HXMT Satellite 期刊论文  OAI收割
The Astrophysical Journal Supplement Series, 2019, 卷号: 244, 页码: 1
作者:  HXMT
  |  收藏  |  浏览/下载：15/0  |  提交时间：2022/02/08
pulsars: general  techniques: miscellaneous  Astrophysics -  Instrumentation and Methods for Astrophysics  Abstract: In this work, we report the in-orbit demonstration of X-ray pulsar navigation with Insight-Hard X-ray Modulation Telescope (Insight-HXMT) Satellite, which was launched on 2017 June 15. The new pulsar navigation method Significance Enhancement of Pulse-profile with Orbit-dynamics is adopted to determine the orbit with observations of only one pulsar. In this test, the Crab pulsar is chosen and observed by Insight-HXMT from 2017 August 31 to September 5. Using the five-day long observation data, the orbit of Insight-HXMT is determined successfully with the three telescopes onboard: High Energy X-ray Telescope, Medium Energy X-ray Telescope, and Low Energy X-ray Telescope, respectively. By combining all the data, the position and velocity of the Insight-HXMT are pinpointed to within 10 km (3ҩ and 10 m s-1 (3ҩ, respectively.  
Observations on the field-aligned irregularities using Sanya VHF radar: 4. June solstitial F-region echoes in solar minimum 期刊论文  OAI收割
CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION, 2014, 卷号: 57, 期号: 1, 页码: 1-9
作者:  Hu Lian-Huan;  Ning Bai-Qi;  Li Guo-Zhu;  Li Ming
  |  收藏  |  浏览/下载：20/0  |  提交时间：2018/09/26
The white-light limb flare of 16 August 1989 and its chromospheric counterpart 期刊论文  OAI收割
SOLAR PHYSICS, 2003, 卷号: 217, 期号: 2, 页码: 235-245
作者:  You, JQ;  Hiei, E;  Li, H
收藏  |  浏览/下载：10/0  |  提交时间：2012/08/08
Estimating horizontal electric current in solar active regions 期刊论文  OAI收割
SOLAR PHYSICS, 1998, 卷号: 182, 期号: 2, 页码: 365-379
作者:  Ji, HS;  Song, MT;  Li, XQ;  Hu, FM
收藏  |  浏览/下载：29/0  |  提交时间：2013/02/05