查询词典 algorithm of euclid

a system of along-track mode sar based on the gps is established.by seeing the gps signal as a chirp,chirp scaling algorithm of this mode with large squint angle is investigated.chirp scaling algorithm is considered more efficient and widely applicable when the bistatic sar system is in side-look or small squint angle mode,but in large squint angle case,the errors caused by taylor expansion are so large that the algorithm could lose its precision.in such a case,an equivalent mono-static sar range mode which has fewer errors than taylor expansion with large squint angle is proposed to substitute the range history of bistatic sar.then bistatic sar images with large squint angles are gotten by common nonlinear cs algorithm.the effectivity of the method is verified by matlab simulation.

摘 要：建立了基于gps的顺轨sar系统模型，通过将gps信号等效为chirp信号，研究了在该模式下的大斜视角chirp scaling算法。在正侧视或小斜视情况下，cs算法具有较好的聚焦性能和广泛的适用性，但在斜视角较大的情况下，该算法将散焦而不能成像，因而提出了用等效的单基地距离模型来代替双基地距离历史的方法，解决了大斜视角情况下距离模型二阶近似误差较大的问题，并结合单基地非线性cs算法，实现了在大斜视角情况下的基于gps反射信号的双基地sar高精度成像，最后通过matlab仿真进行了验证。

For a class of Shunt-wound Active Power Line Conditioner, based on analysis of mathematical model of system and target of control, the algorithm of fuzzy variable structure sliding mode control is presented. The control algorithm can avoid complicated calculation of harmonic electric current in traditional control algorithm, and realize the feedback control of electric current. The algorithm is simple and easily implemented.

针对一类并联型有源电网调节器在分析系统数学模型和控制目标的基础上，提出了模糊滑模控制策略，避免了传统控制方法中复杂的谐波电流计算，实现对电源电流的闭环控制，该算法简单、易于实现，仿真结果证实了变结构滑模控制的有效性。

RSSI-based location is a hotspot in nowadays. This paper presents RSSI-based triangle and centroid location algorithm and trilateration algorithm, and analyses the average positioning error produced by this two methods. Simulation experiments prove that triangle and centroid location algorithm can obviously improve the location accuracy compared to trilateration algorithm.

基于RSSI的定位技术是现阶段研究的热点，本文提出了基于RSSI的三角形质心定位算法和三边测量法，并对两种算法所产生的平均定位误差进行仿真分析，仿真结果表明基于RSSI的三角形质心定位算法比基于RSSI的三边测量定位算法的定位精度有较大提高。

In this algorithm, the Received Signal Strength Indicator ranging technique is employed to replace the distance measurement of one hop away from the anchor node in DV-Hop algorithm. Also a 2-D Hyperbolic algorithm is used to replace the trilateration algorithm in DV-Hop.

该算法引入接收信号强度指示器测距技术代替DV-Hop算法中到锚节点一跳距离测量并采用2-D Hyperbolic算法代替DV-Hop算法中三边测量法。

The results show that values of 1n computed with the D8 algorithm are more discrete and have rougher pattern than those computed with the MFD algorithm, and the mean values of 1n with D8 algorithm are slightly higher than those with the MFD algorithm.

结果表明：与多流向法相比，D8方法的计算值较为离散，分布曲线较粗糙，平均值略高，方差和偏态系数也较大；但是，两种方法计算的1n的分布曲线大致相似。

The results show that values of ln computed with the D8 algorithm are more discrete and have rougher pattern than those computed with the MFD algorithm, and the mean values of ln with D8 algorithm are slightly higher than those with the MFD algorithm.

结果表明：与多流向法相比，D8方法的计算值较为离散，分布曲线较粗糙，平均值略高，方差和偏态系数也较大；但是，两种方法计算的ln 的分布曲线大致相似。

Constraint-based MiniCon algorithm is proposed. This algorithm adds a step of view selection. As a result, the problems of missing query rewritings and generating redundant query rewritings in traditional MiniCon algorithm in presence of domain constraints are solved, and the accuracy and completeness of the algorithm is ensured.

该算法在传统的MiniCon算法中增加了一步视图选择，解决了传统的MiniCon算法中丢失查询重写和生成冗余查询重写的问题，保证了算法的正确性和完备性，并给出了相应的算法分析和实例分析。

Linear Algebra is mainly a subject which studies the linear structure of finite dimensional linear space and its linear transformation while linear concept is in itself from the old Euclid Geometry. The concept of "Linear Space" is a kind of algebraic abstract. In many fields of modern engineering project and technology, because of the influence of computer and graph showing, the algebraic disposal of geometric questions, the visual disposal of algebraic questions, algebra and geometry are tightly combined.

线性代数主要是研究有限维线性空间及其线性变换这一代数结构的学科，而线性概念究其根源则是来自古老的Euclid几何，线性空间概念是几何空间的一种代数抽象，在现代工程技术的许多领域里，由于计算机及图形显示的强大威力，几何问题的代数化处理，代数问题的可视化处理，把代数与几何更加紧密地结合在一起。

According to one of his biographers al-Wahrani Saladin was able to answer questions on Euclid the Almagest arithmetic and law but this was an academic ideal and it was study of the Qur'an and the "sciences of religion" that linked him to his contemporaries.

据他的一位传记作者al-Wahrani记载，萨拉丁能回答有关欧几里得几何学、《天文学大成》、算术和法律的问题，但这只是一种不切实际的想法，而对于《古兰经》和"宗教科学"的学习使他和同时代的人相联系。

According to one of his biographers, al-Wahrani, Saladin was able to answer questions on Euclid, the Almagest, arithmetic, and law, but this was an academic ideal and it was study of the Qur'an and the "sciences of religion" that linked him to his contemporaries.

据他的一位传记作者 al-Wahrani 记载，萨拉丁能回答有关欧几里得几何学、《天文学大成》、算术和法律的问题，但这只是一种不切实际的想法，而对于《古兰Jīng》和"宗教科学"的学习使他和同时代的人相联系。

For the head-teacher of the class said that I had seriously broken the school rules,which led me to a three-day suspend class.

为什么呢？因为我的班主任说我严重的违反了校规，于是让我停课三天。

Many of them believe that the conversion of thousands of working-class folk in England spared that nation from the mass carnage and the tyranny that came with the revolution in France.

他们之中有许多人相信，在英国数以千计的劳工阶级之悔改信主使英国免於遭受如法国大革命所造成的大屠杀和专制暴政。