中国科学院机构知识库网格系统: 检索

Observed Variability of Bottom-Trapped Topographic Rossby Waves Along the Slope of the Northern South China Sea 期刊论文 OAI收割
Journal of Geophysical Research-Oceans, 2021, 卷号: 126, 期号: 12, 页码: e2021JC017746
作者: Wang JH(王景鸿); Shu YQ(舒业强); Wang DX(王东晓); Xie Q(谢强); Wang Q(王强)

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Observations reveal strong abyssal current variabilities in the northern South China Sea, which are interpreted as topographic Rossby waves High frequency topographic Rossby waves weaken westward from Luzon Strait those with low frequency are strong to west of Dongsha Islands The spatial difference of upper-layer fluctuation dominates the distribution of topographic Rossby waves

Health assessment of spatial and temporal distribution of arsenic in soils irrigated with reclaimed water 期刊论文 OAI收割
ENVIRONMENTAL GEOCHEMISTRY AND HEALTH, 2020, 卷号: 42, 期号: 3, 页码: 1001-1008
作者: Lu, Shibao; Zhang, Xiaoling; Pei, Liang; Guo, Min

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Health assessment reclaimed water irrigation Arsenic (As) Spatiotemporal distribution Soil Growing season of vegetables

黄海桑沟湾水体及沉积物中微塑料污染特征研究 期刊论文 OAI收割
海洋环境科学, 2019, 卷号: 38, 期号: 2, 页码: 198-204
作者: 熊宽旭; 赵新月; 周倩; 付传城; 涂晨

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桑沟湾微塑料潮滩丰度空间分布 Sanggou bay microplastics tidal flats abundance spatial distribution In recent years,research on microplastics pollution in the marine environment has been increasing,but studies on microplastics in water bodies and sediments of the bay under the influence of high-intensity human activities are still rarely reported. In this study,the pollution characteristics of microplastics in the wayer and sediments of Sanggou bay were investigated in December 2017,after the harvest of large-scale aquaculture,with the aim to study the effects of aquaculture activities and hydrodynamics on pollution characteristics and spatial distribution of microplastics in the bay. The results showed that the types of microplastics in the water and sediments of Sanggou bay were mainly fibers,fragments,films,foams and particles. The microplastic abundances in the water and sediments were 1.8 ~ 31.2 N/L,31.2 ~ 1246.8 N/kg,respectively. The average particle sizes of microplastics in water and sediments were 0.51 0.20 mm and 1.54 1.02 mm,respectively. The results of spatial distribution of microplastics in Sanggou bay showed that the high abundance area mainly appears in the inshore waters,and the abundance of microplastics tends to decrease from the inner areas of estuary to the outshore areas. The heterogeneity of microplastic abundance and spatial distribution in Sanggou bay is mainly affected by human activities such as aquaculture,living and shipping,as well as hydrodynamics. In the future,fine sampling and analysis are needed to fully understand the temporal and spatial distribution of microplastics pollution in the bay areas.

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

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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.

Implications of nano- and micrometer-size platinum-group element minerals in base metal sulﬁdes of the Yangliuping Ni-Cu-PGE sulﬁde deposit, SW China, 期刊论文 OAI收割
Chemical Geology, 2019, 卷号: 517, 页码: 7-21
作者: Qing-Lin Liang; Xie-Yan Song; Richard Wirth; Lie-Meng Chen; Zhi-Hui Dai

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Nanometer-size Pge-arsenides And Sulfarsenides semimetal Elements pt-as Molecular pge Distribution

Implications of nano- and micrometer-size platinum-group element minerals in base metal sulfides of the Yangliuping Ni-Cu-PGE sulfide deposit, SW China 期刊论文 OAI收割
Chemical Geology, 2019, 卷号: 517, 页码: 7-21
作者: Qing-Lin Liang; Xie-Yan Song; Richard Wirth; Lie-Meng Chen; Zhi-Hui Dai

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Nanometer-size Pge-arsenides And Sulfarsenides semimetal Elements pt-as Molecular pge Distribution

On dynamic performance estimation of fault-prone Infrastructure-as-a-Service clouds 期刊论文 OAI收割
INTERNATIONAL JOURNAL OF DISTRIBUTED SENSOR NETWORKS, 2017, 卷号: 13, 期号: 7, 页码: 11
作者: Zheng, Wanbo; Wang, Yuandou; Xia, Yunni; Wu, Quanwang; Wu, Lei

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Infrastructure-as-a-service Cloud Performance Prediction Pareto Distribution

Species distribution of arsenic in sediments after an unexpected emergent discharge of high-arsenic wastewater into a river 期刊论文 OAI收割
FRONTIERS OF ENVIRONMENTAL SCIENCE & ENGINEERING, 2013, 卷号: 7, 期号: 4, 页码: 568-578
作者: Liu, Ruiping; Xu, Wei; Wu, Kun; Gong, Wenxin; Liu, Huijuan

收藏 | 浏览/下载：38/0 | 提交时间：2015/12/31

river sediments arsenic species distribution binding phases unexpected discharge of high-As wastewater

Immersed nanospheres super-lithography for the fabrication of sub-70nm nanoholes with period below 700nm (EI CONFERENCE) 会议论文 OAI收割
2012 12th IEEE International Conference on Nanotechnology, NANO 2012, August 20, 2012 - August 23, 2012, Birmingham, United kingdom
作者: Li S.; Du J.; Shi L.

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A maskless nano-lithography method by using polystyrene spheres (PSs) self-assembled on silver slab (NSSL) was proposed in [optics express Vol. 16 No. 19 (2008) 14397]. Following that to break the limitations in resolution and PSs period of NSSL method in this paper we present PSs immersed super-resolution lithography (NSISL) technology by embedding the PSs into appropriate material to improve the efficiency of the surface plasmon excitation. The energy modulating mechanism and the rules of the resolution affected by silver slab were studied by calculating and analysing the energy distribution. The curve of the lithography resolution versus the silver thickness was presented. In order to verify this method contrast analysis was carried out with NSSL. The results show that the lithography resolution is improved efficiently. Taking a specific configuration with PS diameter of 600nm as an example the resolution was improved to 54nm from 190nm with Ag thickness of 25nm. Based on the calculation results we carried out the experiments. Nano holes with dimension of 75nm and period of 600nm were obtained. 2012 IEEE.

Parameter optimization of passive dynamic walking biped with knees (EI CONFERENCE) 会议论文 OAI收割
2012 2nd International Conference on Materials Science and Information Technology, MSIT 2012, August 24, 2012 - August 26, 2012, Xi'an, Shaan, China
作者: Zhang P.

收藏 | 浏览/下载：21/0 | 提交时间：2013/03/25

A method to find the optimized parameter values of passive dynamic walking biped is presented. The effects of biped physical parameters on the stability property of passive gaits are studied by simulation experiments. The chosen parameters include the mass distribution length of leg and slope angle. The stability property of passive walking limit cycles is used as criterion of optimization calculation including the orbital stability described by eigen-values of linearized Poincare map and the global property described by size of attraction region. The simulation results show how the stability of limit cycle varies when physical parameters of the passive biped change. The work is useful to explore the inherent property of passive dynamic walking and can be used as an important instruction in the mechanical design of biped robots based on principle of passive dynamic walking. (2012) Trans Tech Publications Switzerland.