一、例题精解 【例题6.1】图6.1(a)所示电路中,已知R=R1=R2=R3=22,C=1F,L=1H, E=12V。电路原来处于稳定状态,t=0时闭合开关S.试求初始值i(0+)ic(0+)、u(0+)、 uc(0) R

1 Graphics with R 1.1 Managing graphics 1.1.1 Graphical Functions 1.1.2 Low-level plotting commands 1.1.3 Graphical Parameters 2 Statistical Analysis with R 2.1 Formulae 2.2 Generic Functions 2.3 Packages 3 Programming with R 3.1 Flow Control 3.2 Functions 3.3 Miscellaneous programming tips 3.4 Debugging 3.5 Efficient programming 3.6 R script editors

1 Introduction 1.1 R website 1.2 Differences between R and S 1.3 Start with R 2 Data with R 2.1 Objects 2.2 Reading data in a file 2.3 Saving data 2.4 generating data 2.5 Manipulating objects 2.5.1 Creating objects 2.5.2 Operators 2.5.3 Accessing the values of an object: the indexing system 2.5.4 Accessing the values of an object with names 2.5.5 Arithmetics and simple functions 2.5.6 Matrix Computation

在不同本底真空和工作气压下制备了不同厚度的Ni81Fe19/Ta薄膜,并进行了磁性测量和原子力显微镜分析.结果表明,较厚的薄膜、较高的本底真空和较低的工作气压下制备的薄膜有较大的各向异性磁电阻.其原因是高本底真空和低工作气压导致大晶粒度和低粗糙度,进而降低电子的散射,减小电阻R,增大△R/R.而较厚薄膜中,大晶粒度的作用将抵消高粗糙度的负作用,使△R/R值增大

总结了稀土金属(R)与过渡金属(T)化合物RT5型系列衍生物中R3(Fe,M)29和R(Fe,M)12的结构和内禀磁性,以及它们之间的关系.阐述了稳定元素(M)和嵌入轻原子(N,C,H)对其结构和内禀磁性的影响

11-1圆柱形电容器内、外导体截面半径分别为R1和R2(R