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conic section 圓錐截面;圓錐[二次]曲線。

conic spring

The basis of dynamics and simulation includes the iterative flyout angle algorithm to the solutions to lambert problem and battin ' s universal conic section state extrapolate method . then spacecraft ' s orbit roots , maneuver impulse and maneuver time are discussed as the following four part : first of all , the chaser ' s one orbit roots is selected as a variable to simulate its influence to the large scale orbital maneuver . the research reveals fact that the orbit roots both of chaser and target should be close to each other to achieve better maneuver and rendezvous “ ability , moreover , the best orbit maneuver and rendezvous occurs when both chaser and target ' s initial phase angle are equal 為了研究了交會機動中追蹤器和目標器的軌道根數、機動時限和機動能耗等因素對交會機動的影響,仿真和分析分為以下四個部分:首先,研究了追蹤器軌道單個參數為變量情況下兩航天器大范圍交會機動問題,研究表明,追蹤器的變化參量與目標器相應的參量在接近的情況下可以獲得良好的交會機動特性,而對于兩航天器軌道共面的情況下,初始相位角相等時則獲得最佳的機動效果。

The methodological beauty and the logical beauty of conic section reflect the internal rational beauty ; 3 . the beauty of mathematics in conic section reveals the new value in internal knowledge structure of textbooks . moreover , the application of the beauty of mathematics in high school math teaching is also discussed from the following four points of view : the pursuit of conciseness , the construction of symmetry , the utilization of unity and the discovery of uniqueness 首先,以圓錐曲線教學為案例來挖掘中學數學教學中的數學美,具體從三個層次探討圓錐曲線語言之美,是數學美的外在形式美具體展現;圓錐曲線方法美、邏輯美,是深層次數學美的內在理性美的反映;在圓錐曲線的教學過程中,利用其數學美處理教材,揭示內在知識結構的新價值;其次,提出數學美在中學數學學習中的具體案例運用,并具體從追求簡潔性、構造對稱性、利用統一性和發現奇異性四個方面來舉例探討。

This paper , which aims at the developing strategy of express service , researching and analyzing chinese and foreign express corporations current situation , forecasts the demand of chinese express market in fifteen years with conic section model on the base of statistics 本文立足于快遞業的發展戰略,調查并分析了中外快遞公司在中國發展的現狀,根據實際的快遞業務數據,利用二次曲線預測模型方法對未來15年內的快遞市場需求量進行預測。