Seasonal evolution of circulation and thermal structure in the Yellow Sea     

庞重光  白学志白虹 王凡 《中国海洋湖沼学报》2005,23(3):269-274

In this paper, the authors used the Princeton Ocean Model (POM) to simulate the seasonal evolutions of circulation and thermal structure in the Yellow Sea. The simulated circulation showed that the Yellow Sea Warm Current (YSWC) was a compensation current of monsoon-driven current, and that in winter, the YSWC became stronger with depth, and could flow across the Bohai Strait in the north. Sensitivity and controlling tests led to the following conclusions, In winter, the direction of the Yellow Sea Coastal Current in the surface layer was controlled partly by tide instead of wind, In summer, a cyclonic horizontal gyre existed in the middle and eastern parts of the Yellow Sea below 10 m. The downwelling in upper layer and upwelling in lower layer were somehow similar to Hu et al. (1991) conceptual model. The calculated thermal structure showed an obvious northward extending YSWC tongue in winter, its position and coverage of the Yellow Sea Cold Water Mass in summer.  相似文献   

GRB Energies and Eγ - Epeak Correlation with the Jet Expanding Laterally at the Sound Speed     

Xiao-Hong Zhao  Jin-Ming Bai 《中国天文和天体物理学报》2007,7(4)

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Fault creep growth model and its relationship with occurrence of earthquakes     

Zuan Chen  Wuming Bai 《Geophysical Journal International》2006,165(1):272-278

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GRB Energies and Eγ - Epeak Correlation with the Jet Expanding Laterally at the Sound Speed     

Xiao-Hong Zhao Jin-Ming Bai 《中国天文和天体物理学报》2007,7(4):503-508

A Gamma-ray burst (GRB) is generally believed to be a jet with a small opening angle, this opening angle is usually derived with the afterglow light curve break time using an analytical method. Here we show that the method is not accurate. Using the set of equations of hydrodynamic evolution with the sideways expansion at the local sound speed derived by previous authors and the observed light curve break times, we numerically derive the initial opening angles. Then the collimation-corrected energies (Eγ) for a sample of GRBs are calculated. They are found to show a wide spread, suggesting that the previously declared clustering by some authors may not exist. Also, the Epeak -Eγ relation, claimed by some other authors (Epeak is the spectral peak energy), is found still to hold, with a slightly stronger correlation.  相似文献   

日照市岚山区耕地需求与保护对策     

孟艳丽  白杨  丁喜莲 《山东国土资源》2007,23(9):21-23,27

日照市岚山区现有耕地虽能满足农产品需求,但不能保证建设用地需要。至2020年建设占用耕地需求量1 400hm2,耕地缺口较大;全区未利用土地质量差、开发难度大,耕地面临短缺的严峻形势。耕地保护的对策是控制人口增长,严格控制非农业建设占用耕地,积极进行土地整理复垦开发和改造中低产田,提高耕地生产力。  相似文献   

The Multi-Wavelength Quasar Survey Ⅲ. Quasars in Field 836     

Yu Bai Yang Chen Xiang-Tao He Jiang-Hua Wu Qing-Kang Li Richard F.Green Wolfgang Voges 《中国天文和天体物理学报》2007,7(3):375-379

This is the third paper in a series connected with our Multiwavelength Quasar Survey. The survey is aimed to provide a quasar sample more complete than any previous survey by using a combined selection technique to reduce selection effects. We present the observational results for the X-ray candidates in field f836. We found 15 X-ray AGNs in this field of which eight are new discoveries. The X-ray data and optical spectra of these AGNs are given. We give the X-ray candidate selection criteria, which proved to be highly efficient in isolating X-ray AGNs.  相似文献   

基于SVG的土地信息服务系统     

史辉  冯永玉  翟亮  柏建群 《山东国土资源》2007,23(10):45-47

SVG是近年来在Web上流行的矢量图形格式,它是一种基于XML的二维矢量图形,正在被越来越多的用户和业界所使用。该文首先讨论了当前Web地图发布中的矢量图形,然后介绍了SVG的特点,重点阐述了基于SVG的土地信息服务系统体系结构、相关技术等。  相似文献   

青海滩间山金矿床找矿矿物学研究     

于凤池  白开寅  贾建业  王永祥  梅安静 《青海国土经略》1997,(2)

本文重点讨论了滩间山金矿床主要矿石矿物的标型特征及其地质意义,可用于矿床类比及该类型金矿床的找矿评价和预测。  相似文献   

日珥线光谱的降维法分析     

李可军  白金明 《天文研究与技术》1993,(2)

本文提出了多搜索变量的目标函数直接优化法。该方法不涉及目标函数的导数计算,通用性强;同时该方法可控制搜索变量在值域内取值,这在一定程度上保证了解的可靠性。用此方法,本文分析了1984年2月18日太阳边缘环珥的一些Hα谱线,结果表明,本文方法具有收敛半径大,精度高的特点。  相似文献   

Tectonic Characteristics and Evolution of Bohai Bay Basin,China     

LIU Pengju  ZHANG Meisheng  SUN Xiaomeng  YANG Baojun 《东北亚地学研究》2002,(1)

Synthetical analyzing the deep geophysical data within Bohai bay basin the authors detect the deep crustal struc-ture presenting high geothermal flux, thinned crust and arched Moho discontinuity, and the basin basement belongs to rigid continental crust. The development of the basin was controlled by two - dimensional faults in NNE and NWW directions. The tectonic units of the basin can be subdivided into three structural divisions: the east, middle and west division. The basin is considered as a continental rift. The tectonic background and regional right條ateral stress field during the late Cretaceous and Paleogene were a compound result of the Kula Plate W-directional subducting under Eurasia Continental Plate in 80-74Ma and the Philippine sea Plate W-directional subducting under the Eurasia Continental Plate since 60Ma, the long -rang effect of the India Continental Plate wedging into the Eurasia Continental Plate and of the Siberia Plate SE梔irectional relatively moving.  相似文献