圆形载流导线的磁场

从载流直导线的磁感应强度公式出发，应用极限理论，计算了圆形载流导线轴线上一点的磁感应强度．     

一段圆弧电流轴线上磁场的解法

直接从载流直导线的磁感应强度公式出发,利用极限的思维方法,分析出任一段载流圆弧导线在轴线上一点产生的磁感应强度表达式,并得出圆电流轴线上的磁感应强度.     

载流螺线管穿过闭合环路时的环流分析

分析了长直载流螺线管的磁场分布及其磁感应强度沿闭合环路的环流,指出载流螺线管穿过闭合环路时磁感应强度沿闭合环路的积分不等于0Im。     

环形电流圆盘在空间中产生的磁场

在得到电流圆环在空间任意点产生的磁场的基础上,将电流环扩展为环形电流圆盘,求出了载流圆盘在空间任意点所产生磁场的分布情况,并利用Mathematica软件进行了仿真.     

载流螺线管穿过闭合环路时(B)的环流分析

分析了长直载流螺线管的磁场分布及其磁感应强度沿闭合环路的环流，指出载流螺线管穿过闭合环路时磁感应强度沿闭合环路的积分不等于μ0I.     

无限长载流螺线管内外磁感应强度的计算

该文给出计算无限长载流螺线管内外磁感应强度的一种简单方法     

载流螺线管轴上磁场的讨论

本文通过对载流螺线管导线沿半径叠绕和导线沿轴线密绕情况下,求出轴线上任意一点的磁感应强度,补充了一般教材的不足     

载流圆线圈在空间任一点的磁场分布

利用第一类、第二类完全椭圆积分及其相互关系，在柱坐标系中较详细地分析了载流圆线圈在空间任一点的磁场分布，对其特例进行了讨论．     

毕奥萨伐尔定律的极坐标形式及应用

中给出当电流置于平面上时，毕奥萨伐尔定律的极坐标形式，利用此形式给出几种特殊形状载流导线在空间一点的磁场。     

有限长均匀载流薄圆柱面面上的磁感应强度

由磁感应强度叠加原理,导出了有限长的均匀载流薄圆柱面面上磁感应强度的表达式.     

A new optimization algorithm based on chaos

INTRODUCTION Chaos (Wang et al., 2002) is a common nonlin- ear phenomenon, whose action is complex and similar to that of randomness. The characteristics of chaos being highly sensitive to the initial value of chaos make a world of differences due to the ergodic prop- erty of the phase space—chaos can go through all states in certain ranges without repetition; the inher- ent randomness of the system—means that chaos behavior is similar to randomness which is disorderly; but at the same t…     

FS4132结构磁空间群的不可约共表示

该文介绍了诱导磁空间群不可约共表示的方法和Fs4132磁空间群的结构,并用此方法计算了该群在第一布里渊区X、L点的不可约共表示.     

Calculating magnetic shielding effectiveness for high-power dc comparator by magnetic circuit method

Magnetic shielding is very important in the design of a high-power dc comparator. This paper addressed the application of magnetic circuit method to calculate the magnetic shielding effectiveness of high-power dc comparators when an external radial magnetic field is added. The mathematical relationship between the magnetic shielding effectiveness and the parameters of the magnetic shielding body were obtained. To verify the validity of the calculation method, we developped a procedure to measure the magnetic shielding effectiveness of the magnetic body by measuring the induction voltage of the detection winding instead of the magnetic intensity at a point in the magnetic shielding body, making the manipulation much easier. The result calculated with the magnetic circuit method turns out to be closer to the measured one compared with that calculated with a conventional algorithm proposed by Ren, suggesting that the magnetic circuit method is an applicable tool for estimating the toroidal cavity magnetic shielding effectiveness of a heavy current comparator when a radial magnetic field is added.     

Carrier phase shifted SPWM based on current sourced multi-modular converter for active power filter

A novel current-source active power filter(APF)based on multi-modular converter with carrier phase-shifted SPWM(CPS-SPWM)technique is proposed.With this technique,the effect of equivalent high switching frequency converter is obtained with low switching frequency converter.It is very promising in current-source APF that adopt superconducting magnetic energy storage component.     

DPLL implementation in carrier acquisition and tracking for burst DS-CDMA receivers

This paper presents the architectures, algorithms, and implementation considerations of the digital phase locked loop (DPLL) used for burst-mode packet DS-CDMA receivers. As we know, carrier offset is a rather challenging problem in CDMA system. According to different applications, different DPLL forms should be adopted to correct different maximum carrier offset in CDMA systems. One classical DPLL and two novel DPLL forms are discussed in the paper. The acquisition range of carrier offset can be widened by using the two novel DPLL forms without any performance degradation such as longer acquisition time or larger variance of the phase error. The maximum acquisition range is 1/(4T), where T is the symbol period. The design can be implemented by FPGA directly.     

Carrier phase shifted SPWM based on current sourced multi-modular converter for active power filter

INTRODUCTION iout = i1 (4) Active power filter (APF) (Grady et al., 1990) The resulting iout is sinusoidal and high quality.is a power conversion system for compensating the In this way, APF could provide the harmonic cur-harmonic and reactive power from the nonlinear rent, which is an essential requirement of theload.…     

DPLL implementation in carrier acquistion and tracking for burst DS-CDMA receivers

This paper presents the architectures, algorithms, and implementation considerations of the digital phase locked loop (DPLL) used for burst-mode packet DS-CDMA receivers. As we know, carrier offset is a rather challenging problem in CDMA system. According to different applications, different DPLL forms should be adopted to correct different maximum carrier offset in CDMA systems. One classical DPLL and two novel DPLL forms are discussed in the paper. The acquisition range of carrier offset can be widened by using the two novel DPLL forms without any performance degradation such as longer acquisition time or larger variance of the phase error. The maximum acquisition range is 1/(4T), whereT is the symbol period. The design can be implemented by FPGA directly. Project (No. 60002003) supported by the National Natural Science Foundation of China     

DPLL implementation in carrier acquisition and tracking for burst DS-CDMA receivers

INTRODUCTIONDS CDMAtechniquesplayanimportantroleincurrentHFCnetworksandwirelesscommuni cationsystems (Chungetal.,1993;Gaudenzietal.,1996 ;Viterbi,1997) .CrucialtotheDS CDMAsystemispropercodeandcarriersyn chronization .Literatureoncodesynchronizationisabun…