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兰州理工大学 [2]
清华大学 [1]
北京大学 [1]
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期刊论文 [6]
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Real-time detection of BDS orbit manoeuvres based on the combination of GPS and BDS observations
期刊论文
IET RADAR SONAR AND NAVIGATION, 2020, 卷号: 14, 期号: 10, 页码: 1603-1609
作者:
Tu, Rui
;
Zhang, Rui
;
Liu, Zhanke
;
Fan, Lihong
;
Han, Junqiang
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  |  
浏览/下载:39/0
  |  
提交时间:2021/11/29
Global Positioning System
artificial satellites
object detection
BDS orbit manoeuvre detection method
Global Positioning System
single BDS system
orbital manoeuvre
observation time
real-time detection
Chinese BeiDou navigation satellite system
timing services
BDS satellites
continuous PNT services
reliable PNT services
geostationary orbit
global positioning
navigation
and timing services
inclined geosynchronous
medium earth orbit
MEO
combined GPS-BDS system
receiver clock error bias
time 157
0 min
Permissible area analyses of measurement errors with required fault diagnosability performance
期刊论文
Sensors (Switzerland), 2019, 卷号: 19, 期号: 22
作者:
Jiang, Dong-Nian
;
Li, Wei
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浏览/下载:16/0
  |  
提交时间:2020/11/14
Measurement errors
Monte Carlo methods
Normal distribution
Adverse effect
Analysis of measurements
Fault diagnosability
Kullback
Leibler divergence
Quantitative evaluation
Reliable detection
Sparse kernels
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
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  |  
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.
Roundtable:Research Opportunities and Challenges for Large-Scale Software Systems
期刊论文
计算机科学技术学报(英文版), 2016
Xusheng Xiao
;
Jian-Guang Lou
;
Shan Lu
;
David C Shepherd
;
Xin Peng
;
Qian-Xiang Wang
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  |  
浏览/下载:3/0
  |  
提交时间:2017/12/04
organization-wide software behavior log analysis reliable cloud distributed system usage data clone detection and management code search
organization-wide software behavior
log analysis
reliable cloud distributed system
usage data
clone detection and management
code search
Fault diagnosis algorithm of chemical industry process based on variable window adaptive KPCA
期刊论文
Dongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Southeast University (Natural Science Edition), 2013, 卷号: 43, 期号: SUPPL.I, 页码: 93-97
作者:
Zhao, Xiaoqiang
;
Yang, Wu
;
Xue, Yongfei
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  |  
浏览/下载:14/0
  |  
提交时间:2020/11/14
Benzene
Chemical industry
Dewaxing
Errors
Failure analysis
Fault detection
Ketones
Principal component analysis
Diagnosis algorithms
False alarm rate
Industry process
Kernel principal component analyses (KPCA)
Ketone Benzol dewaxing process
Large amounts of data
Reliable performance
Variable windows
Design and implementation of voice broadcasting system for airport
期刊论文
2010, 2010
Chne Han
;
Cat Lian-Hong
;
Zhong Yu-Zhuo
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浏览/下载:1/0
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