烟台、威海南部近岸海域物理自净能力研究——Ⅱ.拉格朗日余流模型     

娄安刚  石磊  赵可胜 《中国海洋大学学报(自然科学版)》1994,(Z1)

在该海域潮流计算的基础上,利用有限元法建立了二维的拉格朗日余流模型,得出了威海及烟台南部海域的拉格朗日余流分布。跟踪了文登、乳山、海阳、莱阳近岸主要排污口的污水输运轨迹,为沿岸县市污水排放的选址提供理论依据。  相似文献   

不同植物光合膜中镁离子诱导荧光同膜表面电荷变化相关性的比较研究     

马红  高振泮  翟小京  娄清香  马桂芝  邓文涛  毛大璋  李良壁 《海洋与湖沼》1994,25(5):515-520

用水培的大麦苗及１９９２年，秋在青岛汇泉湾采集的大叶藻和刺松藻制备叶绿体膜，观测了Ｍｇ＾２＋诱导它们的ＰＳ－１１ Ｃｈ１α荧光和膜表面电荷变化之间的相互关系，发现在大麦和大叶藻中，Ｍｇ＾２＋诱导荧光的增高与其诱导膜表面电荷密度的降低平行相关；而在刺松藻中，则无类似的相关性变化，这不仅证明在大麦和大叶藻的叶绿体膜中阳离子对激发能分配的调节作用受膜表面静电性质的控制，而在刺松藻的叶绿体膜中则与膜表面静  相似文献   

Trends and zonal variability of extreme rainfall events over East Africa during 1960–2017     

Ojara  Moses A.  Yunsheng  Lou  Babaousmail  Hassen  Wasswa  Peter 《Natural Hazards》2021,109(1):33-61

Natural Hazards - East African countries (Uganda, Kenya, Tanzania, Rwanda, and Burundi) are prone to weather extreme events. In this regard, the past occurrence of extreme rainfall events is...  相似文献   

Estimating the yaw-attitude of BDS IGSO and MEO satellites   总被引：1，自引：1，他引：0  

Xiaolei Dai  Maorong Ge  Yidong Lou  Chuang Shi  Jens Wickert  Harald Schuh 《Journal of Geodesy》2015,89(10):1005-1018

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中国东北红河国家级自然保护区湿地植被空间格局与环境梯度关系(英文)   总被引：1，自引：0，他引：1  

周德民  栾兆擎  郭逍宇  娄彦景 《地理学报(英文版)》2012,22(1):57-70

Quantifying correlation between the spatial patterns of natural wetland plants and environmental gradient gives better understanding of wetland habitats, which is the fundamental for the strategy making on the protection and restoration of natural wetlands. In this study, the spatial patterns of wetland plants and the environmental gradient of wetland habitats were assessed in the Honghe National Nature Reserve (HNNR) in Northeast China, a wetland of international importance on the Ramsar list. Biophysical parameters’ values of wetland plants were obtained by field sampling methods, and wetland mapping at the community scale was completed using remote sensing techniques. Digital delineation of the surface water system, hydrological zoning and wetness index were produced by spatial analysis methods in Geographic Information System. An ecological ordination method and two clustering methods were used to quantify the relationship between the spatial distribution patterns of wetland plants and the corresponding environmental gradients. Such quantitative analyses also present the specific diversity of different types of wetland plants based on the environmental attributes of their habitats. With the support from modern geo-information techniques, the experimental results indicate how four ecotypes of wetland plants spatially transit from forest swamp, shrub wetland and meadow into marsh wetland with increasing wetness index and water table. And they also show how wetland spatial distribution patterns are controlled by an environmental gradient of wetness. Another key finding of this research work is that our results present the exact fundamental differences between marsh and non-marsh plants of 11 wetland plant communities within the core study area. Hence, this case study gives a good sample for better understanding of the complex correlation between the spatial patterns of wetland plants and their environmental attributes using advanced digital analysis methods. It is also useful to show how to integrate geoinformatic techniques with statistical analysis methods based on the field data base.  相似文献   

Dynamic evolution model of isothermal voids and shocks     

Yu-Qing Lou  Xiang Zhai 《Astrophysics and Space Science》2009,323(1):17-40

We explore self-similar hydrodynamic evolution of central voids embedded in an isothermal gas of spherical symmetry under the self-gravity. More specifically, we study voids expanding at constant radial speeds in an isothermal gas and construct all types of possible void solutions without or with shocks in surrounding envelopes. We examine properties of void boundaries and outer envelopes. Voids without shocks are all bounded by overdense shells and either inflows or outflows in the outer envelope may occur. These solutions, referred to as type void solutions, are further divided into subtypes and according to their characteristic behaviours across the sonic critical line (SCL). Void solutions with shocks in envelopes are referred to as type voids and can have both dense and quasi-smooth edges. Asymptotically, outflows, breezes, inflows, accretions and static outer envelopes may all surround such type voids. Both cases of constant and varying temperatures across isothermal shock fronts are analyzed; they are referred to as types and void shock solutions. We apply the ‘phase net matching procedure’ to construct various self-similar void solutions. We also present analysis on void generation mechanisms and describe several astrophysical applications. By including self-gravity, gas pressure and shocks, our isothermal self-similar void (ISSV) model is adaptable to various astrophysical systems such as planetary nebulae, hot bubbles and superbubbles in the interstellar medium as well as supernova remnants.   相似文献   

Magnetized massive stars as magnetar progenitors     

Ren-Yu Hu  Yu-Qing Lou 《Monthly notices of the Royal Astronomical Society》2009,396(2):878-886

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江西省飞机人工增雨作业临近预报系统   总被引：1，自引：0，他引：1  

支树林  娄桂杰  盛志军 《气象与减灾研究》2009,32(2):62-67

分析了飞机人工增雨作的临近预报产品需求,探讨了能够满足相关需求的探空资料和雷达数据分析方法,通过分析计算可以得到特定高度层上的饱和度等参量以及回波特征,并发现这些特征量对飞机人工增雨作业具有很好的指导作用。以制作和建立飞机人工增雨作业临近预报业务流程,提供临近预报和服务产品为目的,介绍了江西省相关业务的进展情况,重点探讨了预报制作过程中绘图和文档制作的程序实现方法。  相似文献   

柴北缘大型基底断裂——马仙断裂的构造特征研究   总被引：2，自引：0，他引：2  

王亮  肖安成  杨树锋  巩庆霖  周苏平  沈中延  吴磊  楼谦谦 《地质科学》2010,45(1)

利用地面地质、地球物理和钻井资料,对位于柴达木盆地北缘的马仙断裂带的平面分布和剖面结构特征进行了分析,详细的研究了该断裂的形成、发育时间和运动学特征,在此基础上,提出了一个合理的断裂活动的运动学模型。研究认为马仙断裂形成于晚白垩世,在整个新生代期间长期活动,控制了断裂两侧的盆地结构、沉积分布和油气聚集,是一条断面南倾的具有左行走滑分量的斜向冲断层。马仙断裂的运动特征源于南祁连山对盆地的差异性推覆作用。  相似文献   

Anthropogenic effects on sediment quality offshore southwestern Taiwan: Assessing the sediment core geochemical record     

Kandasamy Selvaraj  Gopal Parthiban  Chen-Tung Arthur Chen  Jiann-Yuh Lou 《Continental Shelf Research》2010,30(10-11):1200-1210

Slag material was dumped in two sites off southwestern Taiwan by the China Steel Corporation during 1984–1995. By geochemically analyzing four sediment cores, we investigated the impact of slag on the sediment chemistry. Elemental profiles from the dumping sites show a strong depletion in detrital elements and enrichment in alkaline and redox-sensitive elements, especially for the top ～20 cm of sediments. The relative enrichment factor (EF_rel) exhibits wider range for Ca (0.73–13.33), Fe (0.88–3.03), Mg (0.94–9.58) and Mn (1.22–33.30) due to contamination of sediments by slag. Sediment weathering indicators also show a distinct change with lower values in sediments influenced by dumping due to Ca and Sr addition. Higher EF_rel for As, Cd and Pb in the top sections of the cores indicate an additional modern/industrial input of these elements since ～1950. Our study suggests that slag dumping may have a localized effect on biogeochemical processes by inducing the diagenetic remobilization of certain elements.  相似文献