感应耦合式无接触电能传输系统设计

感应耦合式无接触电能传输模式是一种极具潜在发展前景的电能供给方式。文章介绍了其系统构成和工作原理,建立了其核心器件——无接触变压器的数学模型。在此基础上,对次级补偿、变压器设计、反馈与控制方法进行了深入研究,提出了新的设计方案。然后运用所建立的模型,对系统进行仿真分析和验证。最后通过实际的电源设计,验证了以上分析。     

《电工学》网络课程教学平台

《电工学》网络课程依据的网络教学平台即军队院校网络教学应用系统,该系统对网络课程的建设提供了一个强大的开发工具。依据《电工学》课程在系统中的建设情况对军队院校网络教学应用系统平台进行了阐述,并结合军队院校教育的实际需求,对主要模块中应该注意的问题做了说明。这对于在系统中进行其他课程的建设具有重要的意义。     

Invertible modules for commutative -algebras with residue fields

The aim of this note is to understand under which conditions invertible modules over a commutative -algebra in the sense of Elmendorf, Kriz, Mandell & May give rise to elements in the algebraic Picard group of invertible graded modules over the coefficient ring by taking homotopy groups. If a connective commutative -algebra R has coherent localizations for every maximal ideal , then for every invertible R-module U, U_*=π_*U is an invertible graded R_*-module. In some non-connective cases we can carry the result over under the additional assumption that the commutative -algebra has ‘residue fields’ for all maximal ideals if the global dimension of R_* is small or if R is 2-periodic with underlying Noetherian complete local regular ring R₀. We apply these results to finite abelian Galois extensions of Lubin-Tate spectra.     

On some classes of modules

The aim of this paper is to investigate quasi-corational, comonoform, copolyform and -(co)atomic modules. It is proved that for an ordinal a right R-module M is -atomic if and only if it is -coatomic. And it is also shown that an -atomic module M is quasi-projective if and only if M is quasi-corationally complete. Some other results are developed.     

Symmetric centres of braided monoidal categories

This paper introduces the concept of ‘symmetric centres’ of braided monoidal categories. LetH be a Hopf algebra with bijective antipode over a fieldk. We address the symmetric centre of the Yetter-Drinfel’d module category: and show that a left Yetter-Drinfel’d moduleM belongs to the symmetric centre of and only ifM is trivial. We also study the symmetric centres of categories of representations of quasitriangular Hopf algebras and give a sufficient and necessary condition for the braid of, _Hℳ to induce the braid of , or equivalently, the braid of , whereA is a quantum commutativeH-module algebra     

The globally irreducible representations of symmetric groups

Let be an algebraic number field and be the ring of integers of . Let be a finite group and be a finitely generated torsion free -module. We say that is a globally irreducible -module if, for every maximal ideal of , the -module is irreducible, where stands for the residue field .

Answering a question of Pham Huu Tiep, we prove that the symmetric group does not have non-trivial globally irreducible modules. More precisely we establish that if is a globally irreducible -module, then is an -module of rank with the trivial or sign action of .

     

基于DSP的永磁同步电机磁场定向控制器设计

介绍了一种采用DSP芯片TMS320LF2407A实现永磁同步电机磁场定向控制器的控制原理，给出了采用磁场定向控制策略来设计该控制器的硬件组成结构及软件设计流程。     

GSM数据传输技术及其在野外实时数据采集系统中的应用

利用GSM网络传输野外数据采集系统数据具有非常显著的优点。本文介绍采用点对点方式进行数据采集和传输的野外数据采集系统结构、性能及GSM模块的编程控制方法。