数学

MIT math professor John Bush and visiting student Tristan Gilet built the system in the Applied Math Laboratory, then demonstrated that the drop bouncing may be accurately described with a single simple equation.

麻省理工大学MIT数学教授John Bush和访问学生Tristan Gilet在应用数学实验室建立这个系统，证明了水滴的来回跳动可用一个简单的方程精确描述。

Combining theoretical analysis with experimental demonstration,the mathematical models of the quadrant and the mechanical gravity- pendulum tilt sensor are built.

通过理论分析建立了象限仪读数和机械重力摆式倾斜传感器输出的数学模型，运用数学推导的方法描述了火炮耳轴倾斜随火炮纵倾的关系，从理论上阐明了用象限仪标定炮耳轴倾斜传感器产生误差的原因及其量值，通过试验进行了验证，并提出了解决方法。

After analyzing the condition, the author sums up the following primary characteristics:(1) being able to classify training according to different teacher career stages development;(2) aiming at higher academic credentials;(3) attaching importance to the trainings of modern educational technology, of educational research ability and of bilingual teaching ability;(4) paying attention to forming close connection between experienced teachers and greenhorns.

文中笔者在对苏南地区中学数学教师培养现状分析后认为，苏南地区中学数学教师教育的特点主要包括：(1)能按教师职业发展的不同阶段分类培训；(2)学历教育重在进一步提高层次：(3)重视现代化教育技术、教育科研能力、双语教学能力的培训；(4)重视&师徒结对&的培训方式。

Through the analysis of the work principle of three phases voltage resource PWM converter, set up the low and high mathematic models, deduce the restriction equations about grid voltage, grid current, modulation voltage and the DC output voltage and the calculation equations of the AC-side inductance and the DC-side capacitance. There are two control strategies are adopted: Predicted current control strategy and voltage-current two closed-loop control strategy, and give a comparison by theory and practice.

通过分析三相电压源型PWM变换器的工作原理，分别分析了低频和高频数学模型，并推导出了交流侧电压电流、调制电压、直流侧电压之间的数学约束关系以及交流侧电感和直流支撑电容参数的选取依据公式；分析对比了两种控制策略：预测电流控制和电压电流双闭环控制并加以实验验证；同时采用了负载电流前馈补偿和本文提出的一种基于专家系统的神经元新型智能PI控制器两种方法大大提高了整个系统的动态响应性能，并在仿真和实验中加以验证，这也是本文研究的重点内容之一。

Step 3.4.4: Financial Modeling 步骤3.4.4:财务模型步骤: Process: Using mathematical models containing low-case,expected-case and high-case assumptions, Hewitt consultants will produce projected financial outcomes of the programs.

w 程序：通过使用包含有各种设想的数学模型，程序：通过使用包含有各种设想的数学模型，翰威特的咨询顾问将确定这些方案的预期财务结果。财务结果。

The paper discussed the main factors that influence the design of the boring cutter hilt, constructed the optimizing mathematical model of the boring cutter hilt based on the basis of ANSYS, and made solution for the mathematical model with the help of the optimizing tools of ANSYS. The result shows that the method is a scientific and practical method for the design of boring cutter hilts, and can have great influences on improving the design precision.

分析了影响镗刀杆设计的主要因素，建立了镗刀杆基于ANSYS技术的优化设计的数学模型，并根据ANSYS8.0软件优化工具的功能对该数学模型进行了求解，优化结果表明：该方法是进行镗刀杆设计的一种科学实用的方法，对提高镗刀杆的设计精度有着重要的影响。

We begun with the model of the milk production,mat- thematically derived,following the herdmate comparison rule,the basic formula of Contemporary Comparison Method from the model; then discussed the development of Contemporary Comparison Method acc- ording to the condition in practical breeding;finally,pointed out the imperfects of Modified ...

首先从产奶量的数学模型开始，遵照同群对比的原则，用数学理论导出了这个方法的重要公式 C；然后，根据实际育种状况讨论了这个方法的发展过程；最后，指出了修正后的同群同龄比较法仍然存在的某些问题。并提到了从理论上讲可以避免这些问题的 BLUP 育种值估计法。

The dynamic model and equivalent circuit are researched, A dynamic model and equivalent circuit in d-q frame of dual three-phase synchronous machine are presented for the first time, based on the analyzing of the inductance factor between the windings of synchronous machine under ideal conditions. From them, a dynamic model and equivalent circuit that has general significance is educed.

基于理想同步电动机模型，以相绕组为研究对象，对双电枢绕组同步电动机的动态数学模型进行了研究，首次推导出双电枢绕组同步电动机在d-q坐标系的动态数学模型，绘出了d-q坐标系等效电路。

Make friends with math. Fight 'innumeracy'.

与数学为友，不要做个数学盲。

This dissertation provides a rigorous definition of Internet GIS based on analyzing lots of the latest theories and applications and thoroughly researching in the properties and problems of Internet GIS. The conception of Internet GIS including literal and mathematical description defines its computing model, application model and the relationship among software inscapes which are operation, data and flow, and so lays a solid foundation for theory research.

本文在分析了大量应用的基础上，综合当前计算机发展的最新动态，对于Internet GIS的特点和需要解决的问题作了深入和详细的研究，建立了Internet GIS的严格的定义，包括文字和数学描述，确定了其计算模型和应用模型以及软件构成三元组，即空间操作、空间数据、流动关系，以及它们之间的数学关系，为Internet GIS的理论研究奠定了基础。

Since historical times,England ,where the early inhabitants were Celts, has been conquered three times .

从有历史以来，英国，在此地早期居住的是凯尔特人，已经被征服了三次。

Bluetooth OBEX File Transfer Enables the sending and receiving of files on your phone via Bluetooth.

蓝牙OBEX文件移动允许经过蓝牙传送和接受文件。。。。