ENGINEERING ECONOMICS I TO INVEST, OR NOT TO INVEST, THAT IS THE QUESTION. (With apologies to William Shakespeare) Given one or more potential projects, how do we decide in which to invest, if any? What criteria do we use to evaluate potential projects?

HEAT EXCHANGER NETWORK SYNTHESIS 1: TARGETING OBJECTIVES: 1 Determine the minimum energy inputs required for a process 2Determine the minimum number of heat exchangers required to transfer this energy 3Develop a methodology for determining where these heat exchangers should be placed in the process

HEAT EXCHANGER DESIGN GOALS: Role of heat exchangers in chemical processing Basic concepts and terminology Types of heat exchangers Design methodology Sizing Design Rating

一、General”(常用)选项。 二、各项说明和应用实例 1、 Lock user in home directory(将用户锁定在主目录):如果选中则只允许用户访 问“主目录”以下的文件和目录(主目录即为根目录;如果不选中,则用户可一直 访问到主目录所在盘的实际根目录(比如“d”)下一当然,可能并没有读其下其 他文件目录或写等权限,但是仍建议一般选中此项。 2、Hide 'hidden'files'(隐藏“隐含”文件):在列表时不显示属性为“隐含”的文 件

第1章绪言 一、是否题 1.孤立体系的热力学能和熵都是一定值。(错△U=0,H=0,但△S,△G和 △A不一定等于0,如一体积等于2V的绝热刚性容器,被一理想的隔板一分为二,左 侧状态是T,P的理想气体,右侧是T温度的真空。当隔板抽去后,由于Q=W=0, △U=0,AT=0,H=0,故体系将在T,2V,0.5P状态下达到平衡, AS=-RIn(0.5P/P)=RIn2,= AH -TAS=RTIn 2, 44=AU-TAS=-RT In2) 2.封闭体系的体积为一常数。(错)

Our research program involves the design, synthesis, and detailed physical investigation of novel molecular and nanoparticle materials which display unique self-organized hierarchical structures and specific optical, electronic, andor magnetic properties. Emphasis is placed on materials with potential applications in light-emitting devices, optical memory devices, molecular level and single particle level switching devices, and chemosensory devices

1。为何中国最早开始改革,而且采用渐进改革? a.毛主席的过世,领导人的替换减少了改革的意识形态的障碍。 b.打倒四人帮,邓小平等老一辈革命家需要取得正当性 legitimacy)中国和其他经济发展绩效的比较 (Per capita income in 1990 dollars)

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我们已经研究了矩形波导,对于圆波导的提出应 该有它的理由

低频传输线的能量主要封闭在导线内部。随着频率的提高，能量开放在导线之间的空间(Space)。这是由封闭→开放的第一过程。随着频率的进一步提高，开放空间受干扰，影响太大。又开始用枝节再一次封闭起来，使能量在内部传输。这是由开放→封闭的第二过程，它是对第一次的否定。但是这一次所封闭的不是导线内部，而是空间内部