查询词典 Ac

Experiments showed that the performance of the designed FIR type 25Hz AC counting signalling digital filter can satisfy the particular needs of the cab signals.

通过实验验证了所设计的 FIR 型25Hz 交流计数电码信号数字滤波器的性能可以满足机车信号的特殊要求。

Advanced digital simulation is one of the most effective ways to research large HVDC/AC hybrid systems.

采用先进的数字仿真系统对大规模的交直流混合电力系统进行研究是一个有效的途径。

More energy was lost in the conversion from direct current to AC.

更多的精力损失，在转换，从直流到交流。

Keywords AC field;directional solidification structure;interface solute concentration;interface stability;grain refining

交流电场；定向凝固组织；界面溶质含量；界面稳定性；晶粒细化

And the thesis is divided into 4 parts.In the first part, the development of technology on Adjustable Speed AC Dirve is introduced. And the theory of DTC is analyzed. Besides the two classic DTC strategy, the hexagon flux track and approximate circle flux track controlling system, the thesis introduces some DTC strategies modified and some new controlling arithmetics.

论文共分为四个部分：第一部分介绍了交流调速技术的发展，分析了异步电机直接转矩控制的基本原理，除六边形磁链和近似圆形磁链两种经典的DTC控制之外，还介绍了改进型DTC及其他新型的控制算法。

The topic in view of the existing technique level, the main factors, which influence the measurement precision of the large scale test system, are analyzed in this paper, and the solutions improving the precision are put forward.1 using the multi-channel independent AC to transfer DC module, the power supply of the digit part and the simulation part is discerption, reducing the crosstalk between the digital signal and the simulated signal;2The feedback self-checking module is constructed by singlechip compositive 16 high accuracy A/D , established a closed-loop control system through this module and improved system's overall precision effectively.

本课题针对现有的技术水平，分析了影响大型检测系统测量精度的主要因素，提出了提高精度的具体方案和办法：1采用了多路独立交流转直流模块，数字部分与模拟部分分开供电，减小了数字信号与模拟信号之间的串扰。2利用单片机集成的16位高精度A/D构建了反馈自检模块，通过该模块建立了一个闭环控制系统，有效地改善了系统的整体精度。

The matching device automatic test-board is the checking tool checked the matching device capability, precision and reliability are the technique of the the matching device, the precision is the precondition of checking the matching device, the reliability is credibility degree of the decision checking consequent.the topic in view of the existing technique level, the main factors, which influence the measurement precision of the large scale test system, are analyzed in this paper, and the solutions improving the precision are put forward.1 using the multi-channel independent ac to transfer dc module, the power supply of the digit part and the simulation part is discerption, reducing the crosstalk between the digital signal and the simulated signal;2the feedback self-checking module is constructed by singlechip compositive 16 high accuracy a/d , established a closed-loop control system through this module and improved system's overall precision effectively.

匹配装置自动测试台是检测匹配装置性能的检测工具，其重要的技术指标是精度与可靠性，其高精度是作为检测匹配装置的前提，可靠性是决定了检测结果的可靠度。本课题针对现有的技术水平，分析了影响大型检测系统测量精度的主要因素，提出了提高精度的具体方案和办法：1采用了多路独立交流转直流模块，数字部分与模拟部分分开供电，减小了数字信号与模拟信号之间的串扰。2利用单片机集成的16位高精度a/d构建了反馈自检模块，通过该模块建立了一个闭环控制系统，有效地改善了系统的整体精度。

Shevtchenko en provenance du Milan AC avaient fait réagir l'Ivoirien, actuellement en Allemagne avec sa sélection pour disputer le Mondial 2006, qui avait menacé de quitter Chelsea.

Shevtchenko﹞的到来使得德罗巴不得不做出一些回应，他曾以离开切尔西作为威胁，目前他正同科特迪瓦国家队一起在德国征战世界杯。

150 Chapter 1 The History and Future of Computers 3.2 Boolean Algebra Table 3-2 Distributivity Idempotency Absorption laws 分配律同一律吸收律 a=ab+ac a+= a+a=a aa=a a+ab=a a=a'=a'b''=a'+b' DeMorgan's laws德摩根定理计算机专业英语 1-151 Chapter 1 The History and Future of Computers 3.2 Boolean Algebra Since a finite set of n elements has exactly 2n subsets, and it can be shown that the finite Boolean algebras are precisely the finite set algebras, each finite Boolean algebra consists of exactly 2n elements for some integer n.

由于n个元素的有限集有且只有个子集由于个元素的有限集有且只有2n个子集，而且很显然有限布个元素的有限集有且只有个子集，尔代数一定是有限集合代数，所以对某个整数n而言而言，尔代数一定是有限集合代数，所以对某个整数而言，每个有限布尔代数也有且只有2n个元素。例如，上文定义的集合T的限布尔代数也有且只有个元素。

31 Chapter 3 Number Systems and Boolean Algebra 3.2 Boolean Algebra Table 3-2 Distributivity Idempotency Absorption laws 分配律同一律吸收律 a=ab+ac a+= a+a=a aa=a a+ab=a a=a'=a'b''=a'+b' DeMorgan's laws德摩根定理计算机专业英语 3-32 Chapter 3 Number Systems and Boolean Algebra 3.2 Boolean Algebra Since a finite set of n elements has exactly 2n subsets, and it can be shown that the finite Boolean algebras are precisely the finite set algebras, each finite Boolean algebra consists of exactly 2n elements for some integer n.

由于n个元素的有限集有且只有个子集由于个元素的有限集有且只有2n个子集，而且很显然有限布个元素的有限集有且只有个子集，尔代数一定是有限集合代数，所以对某个整数n而言而言，尔代数一定是有限集合代数，所以对某个整数而言，每个有限布尔代数也有且只有2n个元素。例如，上文定义的集合T的限布尔代数也有且只有个元素。

There are different types of personal loans available.

有许多不同类型的个人贷款优惠。

The above mentioned teaching model of spiral rising can be used to avoid rigidness in teaching.

上述螺旋式上升的教学模式，可以避免教学形成模式後的僵化现象。