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+)

Plant nutrients Plant growth requires various nutrients Major nutrient elements: C,N, P trace elements: S, Si, Cl, I, and metallic elements(Fe, Mn, Cu, etc) The minor elements because of the low demand can Water y be supplied at adequate rates in natural

本章重点学习内容： 1、安全投资与生产投资的关系 2、安全投资与安全效益的关系 3、安全效益评价 4、职业伤害事故经济损失规律与安全经济决策 难点内容： 1、安全损失函数 L（s），增值函数 I（s），安全功能函数 F（s），成本函数 C（s），效益函数 E（s）的理解 2、 全经济投资最低消耗原理 3、 安全投资最大消耗原理 4、 安全经济投资的合理评价 5、 安全经济效益的计量方法

微型计算机的基本组成有三部分,即中央处理器 CPU(通常包括运算器和控制器)+存储器+输入/输出(I/O) 接口。若将组成计算机的基本部件集成在一块芯片上,则 俗称为单片微机。 80C51内部结构如图2-1所示,主要包括中央处理 器CPU(算术逻辑部件ALU、控制器等)、只读存储器 ROM、随机存取存储器RAM、定时器/计数器、并行IO 口P0~P3、串行口、中断系统以及定时控制逻辑电路等

Before we look specifically at thin-walled sections, let us consider the general case (i.e, thick-Walled) Hollow thick-walled sections Figure 12.1 Representation of a general thick-walled cross-section 中=c2 on one boundary φ=c1 on one boundary This has more than one boundary(multiply-connected do=0 on each boundary

Directions: This part is to test you listening ability. It consists of 3 sections Section a: Conversations Directions: In this section, you will hear 10 short conversations. At the end of each mersation, a question will be asked about what was said. Both the conversations and the questions will be spoken only ONCE. After each question there will be a pause During the pause, you must read the four choices marked A), B), C) and D), and decide

Part I Listening Comprehension(20 minutes) ection a Directions: In this section, you will hear 10 short conversations. At the end of each conversation, a question will be asked about what was said. B oth the conversation and the question will be spoken only once. After each quest ion there will be a pause. During the pause, you must read the four choices mar ed A), B), C), and D), and decide which is the best answer. Then mark the corres ponding letter on the Answer Sheet with a single line through the centre

6 The noe effect c Gerd Gemmecker, 1999 Nuclear OVERHAUSER Effect(NOE): resonance line intensity changes caused by dipolare cross- relaxation from neighbouring spins with perturbed energy level populations To understand the nature of the NOE, we have to look at a two-spin system I' and

4.9 Comparison Between Slip and Twinning Similar ity Both slip and twinning are shear process under shear stress T I. Differences 1. Orientation 2. Atom movement 3.y,△ a) Structure: Twinning is easy 4. Conditions b) Temperature da d c) Strain rate (c

In going from the state space model i(t)=A.(t)+ Bu(t y(t)= Ca(t)+ Du(t) to the transfer function G(s)=C(sI -A)-B+D need to form the inverse of the matrix(sI- A)-a symbolic inverse- not easy at all For simple cases, we can use the following