轴对称稳恒磁场的一种解法     

孙新民  丁世荣 《地球科学与环境学报》1997,(2)

本文依据稳恒磁场中的高斯定理和安培环路定理，用迭代法推导出对称轴上的磁感应强度与空间任意一点磁感应强度的关系式，从而可得出轴对称稳恒磁场的无电流分布空间的解式。  相似文献   

A Laboratory Model for the Flow in Urban Street Canyons Induced by Bottom Heating   总被引：2，自引：2，他引：2  

LIU Huizhi  LIANG Bin  ZHU Fengrong  ZHANG Boyin  SANG Jianguo 《大气科学进展》2003,20(4):554-564

Water tank experiments are carried out to investigate the convection flow induced by bottom heating and the effects of the ambient wind on the flow in non-symmetrical urban street canyons based on the PIV (Particle Image Visualization) technique. Fluid experiments show that with calm ambient wind,the flows in the street canyon are completely driven by thermal force, and the convection can reach the upper atmosphere of the street canyon. Horizontal and vertical motions also appear above the roofs of the buildings. These are the conditions which favor the exchange of momentum and air mass between the street canyon and its environment. More than two vortices are induced by the convection, and the complex circulation pattern will vary with time in a wider street canyon. However， in a narrow street canyon， just one vortex appears. With a light ambient wind, the bottom heating and the associated convection result in just one main vortex. As the ambient wind speed increases, the vortex becomes more organized and its center shifts closer to the leeward building.  相似文献   

广西山字型构造对称性成矿规律及找矿方向探讨     

李忠阳  李先粤 《南方国土资源》2008,(10)

文章对广西山字型构造的对称性特点及其对称性的岩浆活动和成矿规律作了研究和分析对比,并应用对称性的成矿规律,结合地质物化探资料,指出了有较好找矿前景的区域.  相似文献   

热带东印度洋SST对气候变暖和变冷的响应     

徐杉  罗义勇 《海洋学报(英文版)》2019,38(5):76-85

The response of the eastern tropical Indian Ocean(ETIO) to heat fluxes of equal amplitude but opposite sign is investigated using the Community Earth System Model(CESM). A significant positive asymmetry in sea surface temperature(SST) is found over the ETIO—the warming responses to the positive forcing exceeds the cooling to the negative forcing. A mixed layer heat budget analysis is carried out to identify the mechanisms responsible for the SST asymmetry. Results show that it is mainly ascribed to the ocean dynamical processes, including vertical advections and diffusion. The net surface heat flux, on the contrary, works to reduce the asymmetry through its shortwave radiation and latent heat flux components. The former is due to the nonlinear relationship between SST and cloud, while the latter is resulted mainly from Newtonian damping and air-sea stability effects. Changes in the SST skewness are also evaluated, with more enhanced negative SST skewness over the ETIO found for the cooling than heating scenarios due to the asymmetric thermocline-SST feedback.  相似文献   

两个相似路径台风造成山东降水明显差异的成因分析     

高留喜  刘畅  丛春华  杨晓霞 《海洋气象学报》2020,40(4)

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微扰Kepler系统轨道微分方程的近似Lie对称性与近似不变量     

楼智美 《海洋学报》2010,32(10):6764-6769

把极角θ视为独立变量,得到Kepler系统的轨道微分方程. 首先讨论Kepler系统轨道微分方程的Lie对称性和不变量,微扰Kepler系统轨道微分方程的精确Lie对称性和精确不变量,其次讨论微扰Kepler系统轨道微分方程的近似Lie对称性和近似不变量,并得到了微扰Kepler系统的9个一阶近似Lie对称性和6个一阶近似不变量,其中1个实为精确不变量,而其余5个分别等于微扰系数ε乘以Kepler系统相应的5个不变量.  相似文献   

TOPOCart—D型仪Y对称性误差的分析与校正     

游传金 《测绘通报》1990,(4):24-27

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也谈Topocart测图仪的Y对称性误差     

周一 《测绘通报》1991,(3):16-19

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大气环流的奇偶对称性（Ⅰ）理论依据和气候特征   总被引：1，自引：0，他引：1  

管兆勇  徐建军 《气象科学》1994,14(4):300-310

文中使用奇偶对称分析方法，利用观测资料对全球环流的奇偶对称分量的分布做了分析，指出奇偶分布的气候特征及其时间演变能反映南北半球海陆差异带来的影响，揭示大气对辐射加热响应的时间尺度、环流的波动结构及全球环流季节性调整等一些特征。  相似文献   

由多项式构成的离散空间直交系          下载免费PDF全文

陈光福 《地球物理学报》1985,28(3):254-259

本文由多项式构成了离散空间的三组直交系;证明了由多项式构成的离散空间直交系的每一直交多项式的诸系数比都是唯一确定的,在这种意义上讲,离散空间直交系是唯一的;从这一唯一性出发,本文导出了直交系各直交多项式的对称性,这种对称性给数据处理,特别是实时数据处理工作带来了方便。  相似文献