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浏览/检索结果: 共139条，第1-10条 帮助

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Evolution Characteristics of New Urbanization in the Provincial Capital Cities of Western China 期刊论文  OAI收割
FRONTIERS IN ENVIRONMENTAL SCIENCE, 2022, 卷号: 10, 页码: 21
作者:  Zou, Yafeng;  Deng, Min;  Wang, Qi;  Zhang, Qian;  Rong, Yao
  |  收藏  |  浏览/下载：31/0  |  提交时间：2022/11/09
Estimating the impact of the license plate quota policy for ICEVs on new energy vehicle adoption by using synthetic control method 期刊论文  OAI收割
Energy Policy, 2020, 卷号: 112022, 期号: --, 页码: --
作者:  Chi,Yuan-Ying;  Wang,Yuan-Yuan;  Xu,Jin-Hua
  |  收藏  |  浏览/下载：26/0  |  提交时间：2021/01/18
New Astronomy in Service of Old Astrology: Close Planetary Conjunctions in Pre-Modern China 期刊论文  OAI收割
JOURNAL FOR THE HISTORY OF ASTRONOMY, 2019, 卷号: 50, 期号: 4, 页码: 411-427
作者:  Li, Liang
  |  收藏  |  浏览/下载：12/0  |  提交时间：2022/07/01
食用蔬菜能吸收和积累微塑料 期刊论文  OAI收割
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：142/0  |  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.  
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：13/0  |  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.  
Assessing the reproductive status of a breeding, translocated female giant panda using data from GPS collar 期刊论文  OAI收割
FOLIA ZOOLOGICA, 2018, 卷号: 67, 期号: 1, 页码: 54-60
作者:  He, Ke;  Qing, Jing;  Zhang, Zejun;  Yang, Biao;  Zhang, Kan
  |  收藏  |  浏览/下载：22/0  |  提交时间：2020/12/24
Geotechnical investigations and remediation design for failure of tunnel portal section: a case study in northern Turkey 期刊论文  OAI收割
Journal of Mountain Science, 2017, 卷号: 14, 期号: 6, 页码: 1140-1160
作者:  Ayberk KAYA;  Kadir KARAMAN;  Fikri BULUT
  |  收藏  |  浏览/下载：35/0  |  提交时间：2017/06/21
Stack and fugitive emissions of major air pollutants from typical brick kilns in China 期刊论文  OAI收割
ENVIRONMENTAL POLLUTION, 2017, 卷号: 224, 期号: 2017, 页码: 421-429
作者:  Liu, Yuanlong;  Zhou, Bianhong;  Li, Jianjun;  Wu, Shuiping;  Shen, Guofeng
  |  收藏  |  浏览/下载：40/0  |  提交时间：2018/10/17
Combined freeze-sealing and New Tubular Roof construction methods for seaside urban tunnel in soft ground 期刊论文  OAI收割
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY, 2016, 卷号: 58, 页码: 1-10
作者:  Kang, Yongshui;  Liu, Quansheng;  Cheng, Yong;  Liu, Xiaoyan
  |  收藏  |  浏览/下载：24/0  |  提交时间：2018/06/05
Auto tuning for new energy dispatch problem: a case study 期刊论文  iSwitch采集
Future generation computer systems-the international journal of escience, 2016, 卷号: 54, 页码: 501-506
作者:  Wang, Jue;  Liu, Chun;  Huang, Yuehui
收藏  |  浏览/下载：28/0  |  提交时间：2019/05/09