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Based on aerodynamic theory and the characteristics of the shockwave around a supersonic projectile, the article constructs a mathematical modeling of a L-shaped vertical target for projectiles shooting with forward direction and any direction, and analyz
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摘要本文根据空气动力学理论和超音速弹丸的激波特性，建立了在使用L型立靶基础上正向射击和任意角度射击时的数学模型，并进行了误差分析，提出了减小误差的修正方法。 |
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Based on agency theory, the paper investigates the relationship between ownership structure and financial constraint level of listed companies in Chinese group corporation.
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摘要本文从大股东代理问题角度，分析了中国企业集团控股股东股权结构与上市公司融资约束水平之间的关系。 |
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Based on all previous hydrological data surveyed since 1998 when the Yangtze Estuary deep water channel regulation engineering was commenced, this paper analyzes the salinity's variation in the north channel in recent years from various points of view.
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摘要根据1998年长江口深水航道治理工程开工以来的历次水文测验资料，从各个角度分析了近年来北槽航道内的盐度变化。 |
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Based on an Urban Forest Conservation in Jiufeng which is located at Wuhan and with an ecotourism function, remote sensing and field survey was used to establish environment database for the surface water environment planning since the non-point pollution
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摘要武汉九峰城市森林保护区是以九峰山和马鞍山森林公园为基础，整合周边山体、植被等自然资源，建成的具有生态旅游功能的城市森林保护区。 |
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Based on an actual engineering example and ANSYS numerical analysis, this article studies the characteristics of the rigid composite foundations when the cushions selected.
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摘要根据工程实例的土质情况建立计算模型，通过ANSYS三维有限元的数值分析，研究了在竖向荷载作用下，褥垫层厚度、模量对刚性桩复合地基工作特性的影响。 |
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Based on an actual project, tests and analyses the heat exchanging performances of the vertical U-shaped ground heat exchanger, and obtains the heat release in summer and the heat absorption in winter of ground heat exchanger for unit well depth and the o
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摘要根据工程实际情况，对竖直U形地埋管换热器的换热性能进行了现场测试和分析，得出了单位井深地埋管的夏季散热量、冬季取热量及最佳地埋管钻孔深度。 |
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Based on an algorithm for solving the time-dependent coefficients nonlinear differential equations numerically, computer software is developed which has an easy-to -use interface.The dynamic response to elastic deformation and stress in key parts and forc
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在研究求解该时变系数非线性微分方程组数值解法的基础上，开发了具有良好人机界面的仿真软件,可以计算出多种参数和工况条件下关键点的弹性位移、应力和运动副反力的变化规律。 |
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Based on an analysis of causes and basic characteristics of drought in north and south areas of China, it is pointed out that drought in north areas, such as the Yellow River Basin and the Huaihe River Basin, was characterized by the severe systematic dem
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摘要以区域干旱特征分析以及干旱灾害应对策略研究为目的，阐述我国南、北方两种不同地域类型的区域干旱成因和基本特征，指出黄淮海区域的干旱特征主要表现在天然水资源短缺引发的系统性深度供需矛盾，以及晴热少雨气候加剧这种矛盾而产生的持续干旱灾害；南方地区的干旱特征主要表现在晴热少雨气候导致枯水年或连续枯水年出现，以及地理气候特征和供水工程容量不足等因素产生的年内季节性干旱缺水。 |
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Based on an analysis of dynamic conditions for migration and precipitation of gold grains in water system and their diffusion in soil, this paper has advanced a discriminant formula for surfacce ore potential of gold anomalies from 1:50000 stream sediment
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摘要在分析金粒在水系中运移、落淤和在土壤中扩散动力条件的基础上，本文建立了五万分之一水系沉积物测量金异常地表含矿性的判别公式，阐述了推算异常内矿石最高金品位的方法并计算了秦巴地区的判别指数；总结出万分之一土壤测量矿致金异常的标志特徵、矿体定位的估算公式及各级次地形坡度角的系数和常数。 |
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Based on an analysis of groundwater pollution situation, the harmful result, causes and the pollution channels, the authors put forward a series of countermeasures, such as the tackling of three wastes, the restriction and suspension of exploitation, the
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摘要在对许昌市2000~2004年地下水水质污染状况、危害、原因和途径分析的基础上，及时采取治理“三废”、限采停采、分层开采、引水补源等防治对策。 |
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Based on an analysis of several kinds of typical libraries of virtual reference service, by on-site inspection, the author puts forward some rationalization service: individuality, one station, self-service of one's accord, the cooperation virtual referen
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摘要基于几种典型的上网图书馆设置虚拟参考咨询项目的分析，通过对多元化虚拟参考咨询服务方式整合，提出了个性化、一站式、自导式及协作式等虚拟参考咨询多元化服务模式。 |
