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Based on the time difference of arrival in time range and the direction of arrival of the emitter in space range, passive localization by single station is practicable, and also the localization of maneuvering target is practicable with the MGEKF algorith
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在建立目标机动模型与测量方程的基础上，运用修正增益扩展卡尔曼滤波(MGEKF)算法，实现对机动目标进行定位与跟踪。 |
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Based on the topographic features and data of sediment particle size of bed load at the fluctuating backwater reach of Liujiaxia Reservoir, the streamwise variation and variation process of median diameter of bed load during silting and scouring periods o
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摘要根据刘家峡水库变动回水区的河段地形特征和历年河床质泥沙粒径级配资料，分析了变动回水区河段淤积和冲刷时，河床质泥沙中值粒径的沿程变化和历年河床质泥沙中值粒径变化过程，并指出粒径分布由粗变细的转折点在变动回水区寺沟峡峡口处。 |
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Based on the torque-speed characteristic curve of induction motors, analyses were done on changes in slip with an variation in frequency when an induction motor drives different kinds of loads, including those with constant torque, constant-maximum torque
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摘要以异步电动机机械特性曲线为基础，分析了变频调速异步电动机在拖动恒转矩负载、恒最大转矩负载、变转矩（非风机和泵类）负载、恒功率负载以及风机和泵类负载时，转差率随频率变化的规律。 |
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Based on the traditional transportation problem with the balance of production and sales, this paper puts forward a direct method to solve the transportation problem whose objective is to maximize the problem-the modified tabular method, so as to diminish
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从传统的产销平衡的运输问题出发，提出了目标函数为极大化型的运输问题的直接解法－修改的表上作业法，可直接求解此类问题，减少运算量，降低应用难度，并在求解过程中明确了求解方法所对应的实际问题的经济意义。 |
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Based on the traits and existent problem of water cycle in western China, the key scientific issues of water cycle in western China has been addressed in this paper.
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从中国西部流域水循环的特点及存在的问题出发，探讨了中国西部流域水循环研究基础科学问题。 |
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Based on the transfer-matrix method, the general expressions of equivalent four-terminal network parameters of varying section torsional horn are derived, the relations between frequency equation and both the rotational velocity amplification and that of
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摘要基于传递矩阵算法，推导出了变截面杆扭转振动时等效四端网络参量的一般表达式，研究了带类余弦过渡段阶梯形变幅杆扭转振动频率方程与角速度放大倍数及外表面切向速度放大倍数等的关系。 |
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Based on the transmission boundary condition, the calculation method of the numerical value of the dynamic model e quation, the discrete form of the pipeline, the storage method of the parameters and the difference equation are given out.
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根据输送边界条件，给出了动态模型方程的数值计算方法、管道离散格式、参数存储方法和差分方程。 |
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Based on the trend research, the impacts of the reduction in diverted water volume of the Yellow River and the decrease in water table on the vegetation in the Yinchuan Plain was analyzed, and the proper groundwater level for vegetation development was al
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在此基础上，对引用黄河水量及多年地下水位的变化对植被的影响进行了分析，并对适宜于植被发育的地下水位埋深进行了探讨。 |
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Based on the tribological principle and the theory of contact mechanics,it is feasible to adopt curvature-changing structure in the Rock-bit journal bearing system.The structure and coupling relationship of curvature-changing journal bearing under the con
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基于摩擦学原理和接触力学理论,提出了可在牙轮钻头滑动轴承中采用变曲率结构.在不考虑摩擦的情况下，就结构设计和配合关系等问题进行了分析讨论，划分了准变曲率、吻合变曲率以及间隙变曲率等3种结构形式；针对考虑摩擦时的变曲率结构，提出了接触形状优化和预磨合的实施方案.钻头轴承试验结果表明，无论是预设计变曲率还是预磨合变曲率，都能改善轴承摩擦副的摩擦学特性，因而值得进一步研究和推广. |
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Based on the triple depiction of GPF, a mapping relationship from GPF to component family was established and GPF based on inheritance was abstractly depicted.
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通过绿色产品族的三元组表述，建立了绿色产品族到零部件族的映射关系，抽象表述了基于继承的绿色产品族。 |
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Based on the tunnel construction between Gubei Road Station and Zhongshan Park Station, this paper introduces the design and manufacturing techniques, features and application of the first homemade earth pressure balance shield machine in the tunnel const
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摘要以上海轨道交通古北路站－中山公园站区间隧道为工程背景，介绍我国首台用于地铁隧道施工的加泥式土压平衡盾构掘进机的设计制造工艺、技术特点和工程应用情况。 |
