ESR and U-series ages of coral reef samples from shallow drill holes in the South China Sea     

Ye Yuguang  Gao Juncheng  He jie  Diao Shaobo  Liu Xinbo  Du Yajing 《海洋学报(英文版)》1991,10(3):423-431

The ages of coral reef samples from several shallow drill holes in the South China Sea are determined by ESR and U-series (230Th/234U) methods. The experimental results show ideal agreement between ESR and U-series ages and that the coral reefs were formed in the early Holocene. In the determination of natural total dose of coral reef by use of the additive dose method good results can be obtained by exponential fitting, no matter how the effect of dose saturation is. It was found that the ratio of the natural ESR signal intensity ( I0) to the ESR signal intensity at dose saturation ( Imax) of sample can reflect the significance of a irradiation efficiency-k value. Using the k value of sample determined by the formula given in this paper, the precision of ESR dating of marine carbonates can be improved.  相似文献   

Retraction Note to: Explanation of liquefaction in after shock of the 2011 great east Japan earthquake using numerical analysis     

Bao  Xiao-Hua  Ye  Guan-Lin  Ye  Bin 《Natural Hazards》2017,86(3):1405-1405

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Visualization of Aqueous Geochemical Data Using Python and WQChartPy     

Jing Yang  Honghua Liu  Zhonghua Tang  Luk Peeters  Ming Ye 《Ground water》2022,60(4):555-564

Graphical methods have been widely used for visualization, classification, and interpretation of aqueous geochemical data to obtain a better understanding of surface and subsurface hydrologic systems. This method note presents WQChartPy, an open-source Python package developed to plot a total of 12 diagrams for analysis of aqueous geochemical data. WQChartPy can handle various data formats including Microsoft Excel, comma-separated values (CSV), and general delimited text. The 12 diagrams include eight traditional diagrams (trilinear Piper, Durov, Stiff, Chernoff face, Schoeller, Gibbs, Chadha, and Gaillardet) and four recently proposed diagrams (rectangle Piper, color-coded Piper, contour-filled Piper, and HFE-D) that have not been implemented in existing graphing software. The diagrams generated by WQChartPy can be saved as portable network graphics (PNG), scalable vector graphics (SVG), or portable document format (PDF) files for scientific publications. Jupyter and Google Colab notebooks are available online to illustrate how to use WQChartPy with example datasets. The geochemical diagrams can be generated with several lines of Python codes. Source codes of WQChartPy are publicly available at GitHub ( https://github.com/jyangfsu/WQChartPy ) and PyPI ( https://pypi.org/project/wqchartpy/ ).  相似文献   

Beijing storm of July 21, 2012: observations and reflections     

Ke Wang  Lu Wang  Yi-Ming Wei  Maosheng Ye 《Natural Hazards》2013,67(2):969-974

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Seasonal variability of leaf litter removal by crabs in a Kandelia candel mangrove forest in Jiulongjiang Estuary, China     

G.C. Chen  Y. Ye  C.Y. Lu 《Estuarine, Coastal and Shelf Science》2008,79(4):701-706

The seasonal variability of leaf litter removal by crabs was observed from May 2006 to April 2007 in a Kandelia candel mangrove forest in Jiulongjiang Estuary, China. Daily average quantities of leaf fall ranged 0.85–3.86 gDW m⁻² d⁻¹, with high values in May, August, October and November. The whole-year's leaf fall was 6.48 t ha⁻¹ yr⁻¹ (1.81 gDW m⁻² d⁻¹). The standing stock of leaf litter on the forest floor was 7.78 gDW m⁻² averaged from the whole year's data, with the lowest value in December (1.23 gDW m⁻²) and the highest in April (16.18 gDW m⁻²). Annually averaged removal (consumption on mangrove floor + burial in burrows) rate of leaf litter by crabs was 0.59 gDW m⁻² d⁻¹. High seasonal variability was observed in the removal rates of leaf litter by crabs. Removal rates in the winter months (December, January and February) were 0.07–0.09 gDW m⁻² d⁻¹, much lower than those in other months with values of 0.59–1.18 gDW m⁻² d⁻¹. Annually averaged percentage of leaf fall removed by crabs was 33%, with the highest values in September (reached 76%) and the lowest values in winter months. Of leaf litter removed by crabs, a large proportion was buried by crabs, and only 12% was consumed by crabs on the forest floor. Leaf litter removal rate, consumption rate on the forest floor, percentages of leaf fall and standing stock removed on the forest floor were significantly positively correlated with air temperature, indicating that leaf removal ability by crabs was higher in warm months than in cold months.  相似文献   

一种H.264帧内模式选择快速算法     

林叶  彭强 《成都信息工程学院学报》2007,22(1):72-75

基于空域的帧内预测是H．264采用的一项重要技术，对编码性能的提高具有重要作用。但是由于支持的帧内预测模式较多，使用率失真优化模型计算的编码复杂度很高。利用像素边缘方向信息，相邻块预测模式间的相关性提出了一种帧内模式选择快速算法，可以预先排除约60％的预测模式，从而减小对率失真优化模型的调用。实验结果表明，算法在基本保持H．264原算法性能的同时，编码时间减少70％以上。  相似文献   

GeoVisuals: a visual analytics approach to leverage the potential of spatial videos and associated geonarratives     

Suphanut Jamonnak  Shamal Al-Dohuki  Xinyue Ye  Farah Kamw 《International journal of geographical information science》2020,34(11):2115-2135

ABSTRACT

Videos embedded with spatial coordinates, especially when combined with additional expert insights, offer the potential to acquire fine-scale multi-time period contextualized data for a variety of different environments. However, while these geospatial multimedia (GSMM) data include abundant spatiotemporal, semantic and visual information, the means to fully leverage their potential using a suite of visual and interactive analysis techniques and tools has thus far been lacking. In this paper, we address this gap by first identifying the types of tasks required of GSMM data, and then presenting a solution platform. This GeoVisuals system utilizes a visual analysis approach built on semantic data points that can be integrated spatially, which in turn enables management in a unified database with combined spatio-temporal and text querying. A set of visualization functions are integrated in two investigation modes: geo-video analysis and geo-location analysis.  相似文献   

Compressibilities of MnFe2O4 polymorphs     

Lijin Ye  Shuangmeng Zhai  Xiang Wu  Chaowen Xu  Ke Yang  Yuji Higo 《Physics and Chemistry of Minerals》2015,42(7):569-577

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A modified monthly degree‐day model for evaluating glacier runoff changes in China. Part I: model development     

Shiqiang Zhang  Baisheng Ye  Shiyin Liu  Xiaowen Zhang  Stefan Hagemann 《水文研究》2012,26(11):1686-1696

The retreat of mountain glaciers and ice caps has dominated the rise in global sea level and is likely to remain an import component of eustatic sea‐level rise in the 21st century. Mountain glaciers are critical in supplying freshwater to populations inhabiting the valleys downstream who heavily rely on glacier runoff, such as arid and semi‐arid regions of western China. Owing to recent climate warming and the consequent rapid retreat of many glaciers, it is essential to evaluate the long‐term change in glacier melt water production, especially when considering the glacier area change. This paper describes the structure, principles and parameters of a modified monthly degree‐day model considering glacier area variation. Water balances in different elevation bands are calculated with full consideration of the monthly precipitation gradient and air temperature lapse rate. The degree‐day factors for ice and snow are tuned by comparing simulated variables to observation data for the same period, such as mass balance, equilibrium line altitude and glacier runoff depth. The glacier area–volume scaling factor is calibrated with the observed glacier area change monitored by remote sensing data of seven sub‐basins of the Tarim interior basin. Based on meteorological data, the glacier area, mass balance and runoff are estimated. The model can be used to evaluate the long‐term changes of melt water in all glacierized basins of western China, especially for those with limited observation data. Copyright © 2011 John Wiley & Sons, Ltd.  相似文献   

One mechanism of production of additional components in emission lines of the spectra of active galaxies     

V. A. Ambartsumian  É. Ye. Khachikian  N. B. Yengibarian 《Astrophysics》1998,41(3):207-213

A new mechanism is suggested to explain the physical phenomenon of the appearance of additional new emission components of hydrogen lines in the spectra of active galactic nuclei (AGNs). The mechanism is based on the assumption that a dense clump of hydrogen is ejected from an AGN and expands rapidly due to a presumed explosion. Two main features of this phenomenon are explained fairly simply: a) the pronounced shift of the additional components from the main components (up to several thousand kilometers per second); b) the large width of the additional components, reaching 100–200 Å. The large share of emission by the additional components in comparison with the main lines is also explained well. Estimates obtained for the physical parameters of the new formations in AGNs fit well into modern concepts of AGNs and the forms of their activity.  相似文献