中国科学院机构知识库网格系统: 检索

Constraints on covariant Horava-Lifshitz gravity from precision measurement of planetary gravitomagnetic field 期刊论文 OAI收割
CHINESE PHYSICS C, 2025, 卷号: 49, 期号: 2, 页码: 9
作者: Zhang LD(张立冬); Li LF(李丽仿); Xu P(徐鹏); Bian X(边星); Luo ZR(罗子人)

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收藏 | 浏览/下载：10/0 | 提交时间：2025/02/17

Horava-Lifshitz gravity gravitomagnetism gravitational constant gravitational gradient measurement space-based experiments parametrized post-Newtonian

An optimized design of grid-controlled modulated X-ray source for space communication 期刊论文 OAI收割
MODERN PHYSICS LETTERS B, 2022, 卷号: 36, 期号: 20
作者: Su, Tong; Sheng, Lizhi; Li, Yao; Qiang, Pengfei; Liu, Yongan

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收藏 | 浏览/下载：46/0 | 提交时间：2022/09/28

Space X-ray communication modulated X-ray source pulsed X-ray generator X-ray communication experiments

SJ-10 Recoverable Satellite for Space Microgravity Experiments 期刊论文 OAI收割
空间科学学报, 2020, 卷号: 40, 期号: 5, 页码: 648-654
作者: Hu WR(胡文瑞); Kang Q(康琦); Duan EK; Long M(龙勉)

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收藏 | 浏览/下载：0/0 | 提交时间：2025/07/09

Microgravity physics Space life science Space microgravity experiments Recoverable satellite

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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收藏 | 浏览/下载：149/0 | 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.

Sliced Orthogonal Array-Based Latin Hypercube Designs 期刊论文 OAI收割
TECHNOMETRICS, 2016, 卷号: 58, 期号: 1, 页码: 50-61
作者: Hwang, Youngdeok; Qian, Peter Z. G.; He, Xu

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收藏 | 浏览/下载：24/0 | 提交时间：2018/07/30

Computer models Design of experiments Latin hypercube designs Model ensembles Space-filling designs

A Theoretical Framework for Calibration in Computer Models: Parametrization, Estimation and Convergence Properties 期刊论文 OAI收割
SIAM-ASA JOURNAL ON UNCERTAINTY QUANTIFICATION, 2016, 卷号: 4, 期号: 1, 页码: 767-795
作者: Tuo, Rui; Wu, C. F. Jeff

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收藏 | 浏览/下载：24/0 | 提交时间：2018/07/30

computer experiments uncertainty quantification Gaussian process reproducing kernel Hilbert space

EFFICIENT CALIBRATION FOR IMPERFECT COMPUTER MODELS 期刊论文 OAI收割
ANNALS OF STATISTICS, 2015, 卷号: 43, 期号: 6, 页码: 2331-2352
作者: Tuo, Rui; Wu, C. F. Jeff

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收藏 | 浏览/下载：27/0 | 提交时间：2018/07/30

Computer experiments uncertainty quantification semiparametric efficiency reproducing kernel Hilbert space

The influence of N-fertilization regimes on N2O emissions and denitrification in rain-fed cropland during the rainy season 期刊论文 OAI收割
ENVIRONMENTAL SCIENCE-PROCESSES & IMPACTS, 2014, 卷号: 16, 期号: 11, 页码: 2545-2553
作者: Dong, Zhixin; Zhu, Bo; Zeng, Zebin

收藏 | 浏览/下载：33/0 | 提交时间：2015/03/26

NITROUS-OXIDE EMISSIONS GREENHOUSE-GAS EMISSIONS NORTH CHINA PLAIN FILLED PORE-SPACE ORGANIC FERTILIZATION FIELD EXPERIMENTS SOIL RESIDUE NITRATE FLUXES

Ground experiments on a liquid bridge facility for TG-2 space laboratory 会议论文 OAI收割
65th International Astronautical Congress 2014: Our World Needs Space, IAC 2014, Toronto, ON, Canada, September 29, 2014 - October 3, 2014
作者: Duan L(段俐); Kang Q(康琦)

收藏 | 浏览/下载：61/0 | 提交时间：2017/05/27

Convection modes Critical temperature difference Ground experiments Oscillation frequency Space experiments Space laboratory Surface deformation Temperature differences

A line mapping based automatic registration algorithm of infrared and visible images 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: Ai R(艾锐); Shi ZL(史泽林); Xu DJ(徐德江); Zhang CS(张程硕)

收藏 | 浏览/下载：38/0 | 提交时间：2013/12/26

There exist complex gray mapping relationships among infrared and visible images because of the different imaging mechanisms. The difficulty of infrared and visible image registration is to find a reasonable similarity definition. In this paper, we develop a novel image similarity called implicit linesegment similarity(ILS) and a registration algorithm of infrared and visible images based on ILS. Essentially, the algorithm achieves image registration by aligning the corresponding line segment features in two images. First, we extract line segment features and record their coordinate positions in one of the images, and map these line segments into the second image based on the geometric transformation model. Then we iteratively maximize the degree of similarity between the line segment features and correspondence regions in the second image to obtain the model parameters. The advantage of doing this is no need directly measuring the gray similarity between the two images. We adopt a multi-resolution analysis method to calculate the model parameters from coarse to fine on Gaussian scale space. The geometric transformation parameters are finally obtained by the improved Powell algorithm. Comparative experiments demonstrate that the proposed algorithm can effectively achieve the automatic registration for infrared and visible images, and under considerable accuracy it makes a more significant improvement on computational efficiency and anti-noise ability than previously proposed algorithms.