2.1 Discrete-Time Signals: Time-Domain Representation Signals represented as sequences of numbers, called samples Sample value of a typical signal or sequence denoted as x[n] with n being an integer in the range-oo≤n≤∞ x[n] defined only for integer values of n and undefined for noninteger values of n Discrete-time signal represented by {x[n]}

4.1 LTI Discrete-Time Systems in the Transform Domain · Such transformdomain- representations provide additional insight into the behavior of such systems It is easier to design and implement these systems in the transform-domain for certain applications We consider now the use of the DtFt and the z-transform in developing the transform- domain representations of an LTI system

Introduction What is international trade theory? International trade theory is basically an exercise in applied general equi- librium modeling. This means that in many cases one can use the general theorems that apply for any Arrow-Debreu economy, most notably about the existence and welfare properties of equilibria. What makes international trade a separate field is that it utilizes some assumptions that allow for much

Nature of Swaps A swap is an agreement to exchange cash flows(现金流)at specified future times according to certain specified rules

第一章植物病原真菌 第一节植物病原真菌概述 什么是真菌? Fungi: Eukaryotic organisms without plastids, nutrition absorptive (osmotrophic), never phagotrophic, lacking an amoeboid pseudopodial phase; cell wall containing chitin and B-glucans; Golgi bodies or individual cisternae present; unicellular or filamentous and contsisting of multicelluar coenocytic haploid hyphae (homo-or heterokaryotic); mostly non-flagellate, fllagella when present always lacking mastionemes; reproducing sexually or asexually, the diploid phase generally short-lived, saprobic, mutualistic, or parasitic.(Hawksworth, 1997)

The Nature of Derivatives derivative(衍生产品/工具) is an instrument whose value depends on the values of other more basic underlying(标的/原 生) variables

Text-related Issac Bashevinsfadematigsa1) an American short-story writer and novelist. Born in Poland, he came to the USA in 1935. His novels deal most with the heritage, faith,and daily lives of Polish Jews, particularly in the Warsaw Ghetto. He was awarded the Nobel Prize for Literature in 1978

Book 4 Teaching Plan Unit 1 TextA Who Is Great Text B How to Be a Leader I. teaching purpose and requirement A. understand the main idea and structure of the texts Text A main idea a. Who is great? \Someone who has made lasting contribution to human civilization is great\. b. the common characteristics the great achiever shave ------an unrelenting drive to succeed (Greatness is built upon tremendous amounts of study

案例: Amazon的建立与成长 1995年7月,杰夫贝索斯西雅图 以30万美元的第一笔投资创业成立 Amazon ama an-p 1997年 Amazon成为了全球最大的网 书店。 销售额1997年1.47亿美元、1998年 6.亿美元、1999年80亿、2001年 124亿美元、2002年达到174亿美元 。2002年利润112亿美元,2003年 算度 预期14.3亿美元

一、是否题 1.偏摩尔体积的定义可表示为=n (av . (错。因对于一个均 相敞开系统,n是一个变数,即(n/an≠0) 2.在一定温度和压力下的理想溶液的组分逸度与其摩尔分数成正比。(对即 =fxf=f(,P)=常数) 3.理想气体混合物就是一种理想溶液。(对) 4.对于理想溶液,所有的混合过程性质变化均为零。(错,H,U,Cp,C的混合过 ,A则不等于零) 5.对于理想溶液所有的超额性质均为零。(对因M=M-M“)