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Shifts in Plant Phenology and Its Responses to Climate Warming in Three Temperate Cities of China during 1963-2020 期刊论文 OAI收割
FORESTS, 2024, 卷号: 15, 期号: 10, 页码: 1712
作者: Cao, Lijuan; Lin, Shaozhi; Liu, Wei; Gao, Chengxi; Bai, Wenrui

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phenology global warming first flowering date first leaf date leaf coloring date

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.

Asymmetric sensitivity of first flowering date to warming and cooling in alpine plants 期刊论文 OAI收割
ecology, 2014, 卷号: 95, 期号: 12, 页码: 3387-3398
作者: Wang, S. P.; Meng, F. D.; Duan, J. C.; Wang, Y. F.; Cui, X. Y.

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early spring flowering first flowering date global warming midsummer flowering temperature sensitivity Tibetan Plateau warming and cooling

A shape context based Hausdorff similarity measure in image matching 会议论文 OAI收割
5th International Symposium on Photoelectronic Detection and Imaging (ISPDI) - Infrared Imaging and Applications, Beijing, June 25-27, 2013
作者: Ma TL(马天磊); Liu YP(刘云鹏); Shi ZL(史泽林); Yin J(尹健)

收藏 | 浏览/下载：36/0 | 提交时间：2013/12/26

The traditional Hausdorff measure, which uses Euclidean distance metric (L2 norm) to define the distance between coordinates of any two points, has poor performance in the presence of the rotation and scale change although it is robust to the noise and occlusion. To address the problem, we define a novel similarity function including two parts in this paper. The first part is Hausdorff distance between shapes which is calculated by exploiting shape context that is rotation and scale invariant as the distance metric. The second part is the cost of matching between centroids. Unlike the traditional method, we use the centroid as reference point to obtain its shape context that embodies global information of the shape. Experiment results demonstrate that the function value between shapes is rotation and scale invariant and the matching accuracy of our algorithm is higher than that of previously proposed algorithm on the MEPG-7 database.

Response of chestnut phenology in China to climate variation and change SCI/SSCI论文 OAI收割
2013
Guo L.; Dai J. H.; Ranjitkar S.; Xu J. C.; Luedeling E.

收藏 | 浏览/下载：28/0 | 提交时间：2014/12/24

Chestnut Climate change First flowering Growing season length Leaf coloring Partial Least Squares regression global warming context growing-season spring phenology eastern china temporal variability plant phenology flowering dates temperate fruit change impacts field crops

Numerical simulations for adaptive optics system (EI CONFERENCE) 会议论文 OAI收割
31st Chinese Control Conference, CCC 2012, July 25, 2012 - July 27, 2012, Hefei, China
作者: Wang X.-J.

收藏 | 浏览/下载：27/0 | 提交时间：2013/03/25

The simulation methods for the adaptive optics (AO) system are studied. Based on the global structure of the AO system the key principles for each module are first discussed systematically including the wave propagation principles wave-front representation coordinates transformation between the coordinates considered wave-front reconstruction algorithm and DM principles. The purpose of these discussions is to establish the theoretical foundations for the numerical simulations of the AO system. Then the simulation steps are described in detail and a series of numerical simulation results are given which validate the effectiveness of our simulation work. 2012 Chinese Assoc of Automati.

The spatiotemporal characteristics of spring phenophase changes of Fraxinus chinensis in China from 1952 to 2007 SCI/SSCI论文 OAI收割
2012
Wang H. J.; Dai J. H.; Ge Q. S.

收藏 | 浏览/下载：27/0 | 提交时间：2012/09/04

phenophases phenological model first leaf Fraxinus chinensis global vegetation model tree species range climate-change leaf-longevity bud-burst phenology 21st-century temperature responses budburst

Topological change disturbs object continuity in attentive tracking 期刊论文 OAI收割
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2010, 卷号: 107, 期号: 50, 页码: 21920-21924
zhou, ke; 周可; luo, Huan; 罗欢; zhou, tiangang; 周天罡; zhuo, yan; 卓彦; Chen, Lin; 陈霖

收藏 | 浏览/下载：15/0 | 提交时间：2013/12/24

attention object-based global-first topological definition of objects topological transformation

Resolution performance of extreme ultraviolet telescope (EI CONFERENCE) 会议论文 OAI收割
4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, November 19, 2008 - November 21, 2008, Chengdu, China
作者: Yang L.

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Extreme Ultraviolet Telescope (EUT) will image solar corona in four EUV narrow bandpasses defined by multilayered coatings deposited on normal incidence optics. In order to make sure it will get sub-arcsecond angular resolution in the mission we have to test its resolution performance on ground. The EUT is aligned by Zygo interferometer first and a global wavefront error of 0.152 peak to valley is obtained ( = 632.8nm ). Because of the difficulty of angular resolution test for EUT at its operating wavelengths we test its optical performance at visible and UV band. The method is to place the resolution test-target on the focal plane of collimator and illuminate the target by visible and UV light espectively then the collimated light will go through EUT and image at focal plane on CCD. By analysis of the images obtained in experiments we conclude that the angular resolution of EUT is 1.22 at visible light ( = 570nm ) which is very close to diffraction limit (1.20) and according to these results we estimate that the operational wavelength resolution is better than 0.32 meets design requirements. While for UV light the angular resolution is 1.53 that is different from diffraction limit (0.53) the error comes mainly from large pixel of EUV camera. 2009 SPIE.

Neural Correlation of 'Global-first' Topological Perception: Anterior Temporal Lobe 期刊论文 OAI收割
BRAIN IMAGING AND BEHAVIOR, 2008, 卷号: 2, 期号: 4, 页码: 309-317
zhou, tiangang; 周天罡; Zhang, Jun; Chen, Lin; 陈霖

收藏 | 浏览/下载：32/0 | 提交时间：2013/12/25

Global-first Topological properties Apparent motion Perceptual object fMRI Anterior temporal lobe (ATL)