Ch.9
西门子变频器V20 操作手册CH[9]
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西门子变频器V20 操作手册CH西门子变频器V20操作手册一、产品简介紧凑的尺寸,节省空间和成本简单的安装和调试,无需专业知识高效的节能功能,降低运行成本灵活的通信接口,支持多种协议易于操作的基本操作面板(BOP),提供直观的菜单结构和参数设置二、安全注意事项只有合格的人员才能操作变频器。
合格的人员是指具有相关技术知识和经验,能够识别和避免潜在的危险的人员。
在变频器通电或运行时,不要触摸任何带电部件或裸露的导线,以防止触电或短路。
在变频器通电或运行时,不要打开变频器的外壳或盖板,以防止触电或机械伤害。
在变频器通电或运行时,不要对变频器进行任何修改或维修,以防止损坏变频器或影响其性能。
在变频器通电或运行时,不要将任何物体插入变频器的散热孔或通风口,以防止引起火灾或故障。
在变频器通电或运行时,不要将任何易燃、易爆或腐蚀性的物质靠近变频器,以防止引起火灾或故障。
在变频器通电或运行时,不要将任何液体溅到变频器上,以防止引起火灾或故障。
在变频器通电或运行时,不要将任何金属物品落到变频器内部,以防止引起火灾或故障。
在安装、调试、操作和维护变频器时,请遵守当地的法律法规和标准。
三、安装说明3.1 安装环境安装位置应该平稳、干燥、清洁,并有足够的空气流通。
安装高度不应超过1000米。
如果超过1000米,请根据海拔高度降低输出功率。
环境温度应在-10℃至+50℃之间。
如果超过此范围,请根据温度降低输出功率。
环境湿度应在5%至95%之间,无冷凝水珠。
环境中无强烈的电磁干扰、尘埃、油污、化学气体、盐雾等污染物。
环境中无直接的日光照射、强烈的振动或冲击。
3.2 安装方式穿墙式安装:将变频器的散热部分穿过控制柜的后壁,使之暴露在外部,适用于空间较大或散热较差的场合。
保持变频器之间和周围物体之间的足够距离,以便于散热和维护。
保持变频器的水平方向,不要倾斜或倒置。
保持变频器的正面朝向操作人员,不要旋转或反转。
使用适当的螺钉和垫片将变频器牢固地固定在安装位置上,以防止松动或脱落。
《机械原理》习题答案-CH09

力作用点的速度方向: 沿移动副导路方向。
1) 凸轮从图示位置转过90º 后推杆的位移; 图示位置推杆的位移量S0应 是沿推杆的导路方向(与偏距圆 相切)从基圆开始向外量取。 凸轮从图示位置转过90º 后 推杆的位移等于推杆从图示位 置反转90º 后的位移。 推杆从图示位置反转90º 后 的导路方向仍于与偏距圆相切。 其位移量S1 仍是沿推杆的导路 方向从基圆开始向外量取。 凸轮从图示位置转过90º 后推杆的位移:S=S1 -S0
2)远休2 2 dx / d ( s 0 s ) cos( 2) e sin( 2) 3 3 2 2 dy / d ( s 0 s ) sin( 2) e cos( 2) 3 3
3 [0, / 3] 5 5 5 dx / d (ds / d )sin( 3) ( s 0 s) cos( 3) e sin( 3) 6 6 6 3h 5 5 5 sin(3 3)sin( 3) ( s 0 s)( 3) e sin( 3) 2 6 6 6 5 5 5 dy / d (ds / d )sin( 3) ( s 0 s)sin( 3) e cos( 3) 6 6 6 3h 5 5 5 sin(3 3) cos( 3) ( s 0 s)sin( 3) e cos( 3) 2 6 6 6 4)近休阶段 4 [0,5 / 6] 7 7 dx / d ( s 0 s ) cos( 4) e sin( 4) 6 6 7 7 dy / d ( s 0 s ) sin( 4) e cos( 4) 6 6
1)推程阶段
1 [0, 2 / 3] dx / d (ds / d ) sin 1 ( s 0 s) cos 1 e sin 1 3h { [1 cos(3 1)]}sin 1 ( s 0 s) cos 1 e sin 1 2 dy / d (ds / d ) cos 1 ( s 0 s )( sin 1) e cos 1 3h { [1 cos(3 1)]}cos 1 ( s 0 s ) sin 1 e cos 1 2
JB-QB-CH9800 火灾报警控制器 消防联动控制器 使用说明书

20210510本说明书中所有带有标识的条款都需要设备使用人员谨慎操作。
警告目录1 概述 (4)1.1 产品特点 (4)1.1.1彩色显示界面 (4)1.1.2 多功能配置选择 (4)1.1.3 配备总线手动控制盘和多线联动控制盘 4 1.1.4操作灵活方便 (4)1.1.5联动矩阵编程 (4)1.1.6火灾声警报与应急广播交替播放 (4)1.2额定使用条件 (4)1.3主要技术指标 (4)2 系统组成及工作原理 (4)2.1 控制器结构及典型配置方式概述 (4)2.2按键及面板设置说明 (5)2.3联动控制盘说明 (5)2.4工作原理 (6)3安装与调试 (6)3.1开箱检查 (6)3.2控制器的安装条件及方式 (6)3.3外部设备检查 (7)3.4开机 (7)3.5现场调试 (8)4一般性用户使用说明 (8)4.1 基本特点 (8)4.2 技术特性与功能 (8)4.2.1开机显示 (8)4.2.2正常监控状态....................................9 4.2.3火警报警状态 (9)4.2.4其他报警状态 (9)4.2.5复位 (9)4.2.6消音 (9)4.2.7设备检查操作 (10)4.2.8信息查询界面 (10)4.2.9帮助界面 (10)4,2,10手动控制 (10)4.2.11自检操作 (10)4.2.12手自动切换 (10)4.2.13声光控制 (10)5控制器编程设置操作 (11)5.1 编程设置操作 (11)5.2 系统设置 (11)5.3 回路信息 (11)5.4 联动关系 (11)5.5 总线盘定义 (11)5.6 多线盘定义 (12)5.7 显示盘定义 (12)5.8 其它设置 (12)5.9 其它操作 (12)6 维修与保养 (13)7 故障分析与排除 (13)8 运输及贮存 (13)9 产品成套 (14)1 概述JB-QB-CH9800(简称CH9800,外形如下图)火灾报警控制器消防联动控制器(简称控制器)是西安西核彩桥实业科技有限公司推出的新一代控制器,为适应工程设计的需要,本控制器兼有联动控制功能,可与西安盛赛尔公司和本公司生产的其它产品配套使用,组成配置灵活的报警联动一体化控制系统。
ch开头的英语单词50个

ch开头的英语单词50个1.chair(椅子)2.chicken(鸡)3.check(检查)4.cheese(奶酪)5.cherry(樱桃)6.chat(聊天)7.cheap(便宜的)8.cheat(欺骗)9.choice(选择)10.chocolate(巧克力)11.chopsticks(筷子)12.church(教堂)13.change(改变)14.children(孩子们)15.chimney(烟囱)16.China(中国)17.Chinese(中文;中国人;中国的)18.chip(芯片;碎片)19.chill(寒冷;使变冷)20.champion(冠军)21.characteristic(特征)22.chemistry(化学)23.cheque(支票)24.childhood(童年)25.choose(选择)26.Christmas(圣诞节)27.chronic(慢性的)28.chord(和弦)29.chorus(合唱)30.chauffeur(司机)31.chaos(混乱)32.charm(魅力)33.chef(厨师)34.cherish(珍惜)35.chameleon(变色龙)36.challenge(挑战)37.chamber(房间;腔)38.champagne(香槟酒)39.chant(圣歌;反复呼喊)40.charcoal(木炭)41.charlatan(骗子)42.chasm(裂口;深坑)43.chassis(底盘)44.chastise(惩罚)45.chateau(城堡;庄园)46.cheetah(猎豹)47.checklist(清单)48.cheer(欢呼)49.cheek(脸颊)50.cheerful(快乐的)。
云的电码以及所代表的天气意义

云的电码以及所代表的天气意义周雪梅一、云码气象报告中采用CH CM CL三类云码。
每类包括十一个云码,云码所表示的是某一高度气层整个云天的状态,用来反映当时大气的运动状况&发展趋势。
一个云码可以表示一种云,也同时表示几种云。
(一)、CH云:包括CI CS CC三个云属CH=0 没有CH云。
CH=1 毛卷云,不是有系统侵入天空的。
非系统发展的钩卷云也编报CH1。
CH=2 密卷云,不是系统侵入天空的。
有时可能的积雨云顶部的残余部分。
CH=3 伪卷云,是积雨云的残余,或是远处见不到母体的积雨云的顶部。
对于砧状卷云是否来源于积雨云有怀疑时,应报CH2。
CH=4 卷云(常常是钩卷云)有系统的侵入天空,常全部渐渐变厚。
CH=5 卷层云有系统的侵入天空,且常全部增厚,连续云层的高度角不到45度。
有时卷层云前端有卷云,它们常成辐辏状向天空发展,如卷云和卷层云共存时,所谓连续云层的高度角,是以卷层云前缘部分为准,而不包括卷云部分。
CH=6 卷层云有系统侵入天空,连续云层的高度角已经达到或超过45度,且未布满天空。
CH=7 卷层云布满天空。
CH=8 卷层云不是有系统的侵盖天空,也不布满天空。
CH=9 卷积云为主的高云天空。
卷积云与卷层云同时存在,卷积云量多于卷层云,但卷层云正在逐渐侵盖天空,即因编报电码5或6。
CH=X 由于黑暗、或雾、或沙尘暴、或其他类似现象,或有完整的较低云层存在(一般指云量为10或10-),以至看不到属于CH云的各属云。
(二)、CM云,包括AS、AC、NS三个云属及SCLENT SCCAST两个云类。
CM=0 没有CM云。
CM=1 透光高层云。
CM=2 蔽光高层云或雨层云。
厚的高层云&雨层云是经常在连续演变,期间没有明显的界限,除结构有所不同外,在组成和成因上都是一样的,故包括在同一云码中。
CM=3 透光高积云,较稳定,并且在同一个高度上。
CM=4 透光高积云(常成荚状)或荚状层积云,云片常不断地变化,常出现在不同高度上。
天线概论(有个friis公式)

吳鳳技術學院 電子工程系 黃仁芬編寫
CH.9 Radiation and Antennas(edited by hjf)
1
本章內容
概論 短雙極 天線輻射特性 半波雙極天線 任意長度的雙極天線 一個接收天線的有效面積 Friis傳輸公式 大孔徑天線的輻射 矩型孔徑有著均勻孔徑分佈 天線陣列 N個陣列有著均勻相位分佈 陣列的電子掃描
Prad ≤ 100% Pt
天線增益(antenna gain)
G = ξD
CH.9 Radiation and Antennas(edited by hjf)
31
9-2.5 輻射電阻(Radiation Resistance)
天 線 的 阻 抗 可 分 成 輻 射 電 阻 (radiation resistance) Rrad和耗損電阻(loss resistance) Rloss,
CH.9 Radiation and Antennas(edited by hjf)
27
天線指向性(Antenna Directivity)
指向性D定義為
Fmax 1 4π = = 1 Fav Ωp ∫∫4π F (θ , φ )dΩ 4π 對於等方向天線 Ω = 4π , D = 1 D=
p iso
18
9
短雙極的功率密度(Power Density)~2
將功率密度的最大值定為Smax,於是定義歸一化輻射強 度(normalized radiation intensity) F(θ, φ)。
F (θ , φ ) = S ( R ,θ , φ ) S max
對於Hertzian Dipole
2 η k 2 I 2l 2 15πI 0 l S max = S 0 = 0 2 0 2 = 2 32π R R λ F (θ , φ ) = F (θ ) = sin 2 θ 2
复杂化合物命名及编号原则
1.5 联环烃 两个或两个以上的环(单或稠环), ),彼此以单键或双 两个或两个以上的环(单或稠环),彼此以单键或双 键直接相连,而且联键的数目总数少于所含环系的总数, 键直接相连,而且联键的数目总数少于所含环系的总数, 称为联环烃。 称为联环烃。
1 1'
1 1'
2' 1
1,1'-联二苯 联 1,1'-联环丙烷 联 1 2 1' 2-苯基萘 苯 1' 1 2 2' 2-(2'-萘基)-奥 萘 奥
S Me S O O N CO2H
(4S,顺)-N-[3-(苯甲酰硫基)-2(S)-甲基-丙酰基]-4-苯硫基-L脯氨酸 (4S, cis)-N-[3-(Benzoylthio)-2(S)-methyl-propionyl]-4phenylthio-L-proline
N N HCl
N,N-二甲基-10,11-二氢-5H-二苯并[b,f]氮杂卓-5-丙胺盐酸盐 (10,11-Dihydro-N,N-dimethyl-5H-dibenz[b,f]azepine-5-) propanamine hydrochloride
7
H2C
1
H C
2
CH2
11
HC
12
2 1
3
CH CH2 4 CH2 5 CH
7
H 2C
1
H C
2
H C
8 CH2 CH2 3
H2C
CH2 H2C 10CH2 CH
3
CH2
9 CH2 13 CH2
H2 C
8 CH2
H 2C
5 二环[3,2,1]辛烷 辛
6
C H
大学有机化学答案第五版
大学有机化学答案第五版【篇一:有机化学-第五版-华北师范大学等-李景宁-全册-课后习题答案(完整版)】3、指出下列各化合物所含官能团的名称。
(1) ch3ch=chch3答:碳碳双键 (2) ch3ch2cl 答:卤素(氯) (3) ch3chch3答:羟基(4) ch3ch2 c=o 答:羰基 (醛基)ch3cch3(5)答:羰基 (酮基)(6) ch3ch2cooh 答:羧基 (7)2答:氨基(8) ch3-c≡c-ch3 答:碳碳叁键4、根据电负性数据,用和标明下列键或分子中带部分正电荷和负电荷的原子。
答:6、下列各化合物哪个有偶极矩?画出其方向(1)br2 (2) ch2cl2 (3)hi(4) chcl3(5)ch3oh (6)ch3och3 答:以上化合物中(2)、(3)、(4)、(5)、(6)均有偶极矩(2) h2c(6)h3ccl (3)i(4)cl3 (5)h3cohch37、一种化合物,在燃烧分析中发现含有84%的碳[ar(c)=12.0]和16的氢[ar(h)=1.0],这个化合物的分子式可能是(1)ch4o(2)c6h14o2 (3)c7h16(4)c6h10 (5)c14h22 答:根据分析结果,化合物中没有氧元素,因而不可能是化合物(1)和(2);在化合物(3)、(4)、(5)中根据碳、氢的比例计算(计算略)可判断这个化合物的分子式可能是(3)。
第二章习题解答1、用系统命名法命名下列化合物(1)2,5-二甲基-3-乙基己烷(3)3,4,4,6-四甲基辛烷(5)3,3,6,7-四甲基癸烷(6)4-甲基-3,3-二乙基-5-异丙基辛烷2、写出下列化合物的构造式和键线式,并用系统命名法命名之。
(3)仅含有伯氢和仲氢的c5h12答:符合条件的构造式为ch3ch2ch2ch2ch3;键线式为;命名:戊烷。
3、写出下令化合物的构造简式(2)由一个丁基和一个异丙基组成的烷烃(4) 相对分子质量为100,同时含有伯、叔、季碳原子的烷烃答:该烷烃的分子式为c7h16。
CH 9 CAN总线技术
9.1
CAN总线的性能特点 CAN总线的性能特点
4. 报文滤波 5.节点数主要取决于总线驱动电路 6.短帧结构 7.CRC校验及其他检错措施 CRC校验及其规范 CAN的技术规范
CAN技术规范(Version2.0) CAN技术规范(Version2.0)A和B: 技术规范 2.0A:CAN报文标准格式 2.0A CAN报文标准格式 2.0B 2.0B:标准的和扩展的两种格式 CAN只采用了ISO/OSI模型中的物理层 CAN只采用了ISO/OSI模型中的物理层 只采用了ISO/OSI 和数据链路层。 和数据链路层。
第九章 CAN总线
第9章 CAN总线
9.1 CAN总线的性能特点 9.2 CAN的技术规范
9.2.1 CAN的物理层 9.2.2 CAN的数据链路层 9.2.3 报文的传送及其帧结构
9.1 CAN总线的性能特点
1. 多主方式工作 2. 网络上的节点信息分成不同的优先 级,可满足不同的实时要求。 可满足不同的实时要求。 3. 非破坏性总线仲裁技术
CAN数据链路层由一个CAN控制器实现, CAN数据链路层由一个CAN控制器实现,采用 数据链路层由一个CAN控制器实现 CSMA/CD方式 但不同于普通的Ethernet 方式, Ethernet, 了CSMA/CD方式,但不同于普通的Ethernet, 它采用非破坏性总线仲裁技术,网络上节点 它采用非破坏性总线仲裁技术, 信息) (信息)有高低优先级之分以满足不同的实 时需要。 时需要。 当总线上有两个节点同时向网上输送信息时, 当总线上有两个节点同时向网上输送信息时, 优先级高的节点继续传输数据,而优先级低 优先级高的节点继续传输数据, 的节点主动停止发送, 的节点主动停止发送,有效地避免了总线冲 突以及负载过重导致网络瘫痪的情况。 突以及负载过重导致网络瘫痪的情况。
曼昆微观经济学答案ch09
Application: International TradeWHAT’S NEW IN THE THIRD EDITION:Some discussion has been added concerning why trade is contentious and why the government imposes tariffs and quotas even though they are not efficient. There are two new In the News boxes: ―Trade Policy in India‖ and ―Globalization‖. A new Case Study on ―Trade Agreements‖ has also been added along with a discussion of the role of the World Trade Organization. In addition, the In the News box, ―Life in Isoland‖, has b een updated.LEARNING OBJECTIVES:By the end of this chapter, students should understand:what determines whether a country imports or exports a good.who wins and who loses from international trade.that the gains to winners from international trade exceed the losses to losers.the welfare effects of tariffs and import quotas.the arguments people use to advocate trade restrictions.CONTEXT AND PURPOSE:Chapter 9 is third in a three-chapter sequence dealing with welfare economics. Chapter 7 introduced welfare economics: the study of how the allocation of resources affects economic well-being. Chapter 8 applied the lessons of welfare economics to taxation. Chapter 9 applies the tools of welfare economics from Chapter 7 to the study of international trade, a topic that was first introduced in Chapter 3. The purpose of Chapter 9 is to use welfare economics to address the gains from trade more precisely than in Chapter 3, which discussed comparative advantage and the gains from trade. This chapter develops the conditions that determine whether a country imports or exports a good anddiscusses who wins and who loses when a country imports or exports a good. This chapter will show that when free trade is allowed, the gains of the winners exceed the losses of the losers. Since there are gains from trade, restrictions on free trade reduce the gains from trade and cause deadweight losses similar to those generated by a tax.9APPLICATION: INTERNATIONALTRADE174 Chapter 9/Application: International TradeKEY POINTS:1.The effects of free trade can be determined by comparing the domestic price without trade to theworld price. A low domestic price indicates that the country has a comparative advantage inproducing the good and that the country will become an exporter. A high domestic price indicates that the rest of the world has a comparative advantage in producing the good and that the country will become an importer.2.When a country allows trade and becomes an exporter of a good, producers of the good are betteroff, and consumers of the good are worse off. When a country allows trade and becomes animporter of a good, consumers are better off, and producers are worse off. In both cases, the gains from trade exceed the losses.3. A tariff—a tax on imports—moves a market closer to the equilibrium that would exist without tradeand, therefore, reduces the gains from trade. Although domestic producers are better off and the government raises revenue, the losses to consumers exceed these gains.4.An import quota—a limit on imports—has effects that are similar to those of a tariff. Under a quota,however, the holders of the import licenses receive the revenue that the government would collect with a tariff.5.There are various arguments for restricting trade: protecting jobs, defending national security,helping infant industries, preventing unfair competition, and responding to foreign trade restrictions.Although some of these arguments have some merit in some cases, economists believe that free trade is usually the better policy.CHAPTER OUTLINE:I. The Determinants of TradeA. Example used throughout the chapter: the market for steel in a country called Isoland.Chapter 9/Application: International Trade 175B.The Equilibrium Without Trade1.If there is no trade, the domestic price in the steel market will balance supply and demand.2. A new leader is elected who is interested in pursuing trade. A committee of economists is organized to determine the following:a. If the government allows trade, what will happen to the price of steel and the quantity of steel sold in the domestic market?b.Who will gain from trade, who will lose, and will the gains exceed the losses?c. Should some sort of import restriction be put in place in the market for steel?C.The World Price and Comparative Advantage 1.The first issue is to decide whether Isoland should import or export steel. a. The answer depends on the relative price of steel in Isoland compared with the price of steel in other countries.b.Definition of world price: the price of a good that prevails in the world market for that good.2.If the world price is greater than the domestic price, Isoland should export steel; if the world price is lower than the domestic price, Isoland should import steel.176 Chapter 9/Application: International Tradea. Note that the domestic price represents the opportunity cost ofproducing steel in Isoland, while the world price represents theopportunity cost of producing steel abroad.b. Thus, if the domestic price is low, this implies that the opportunity costof producing steel in Isoland is low, suggesting that Isoland has acomparative advantage in the production of steel. If the domestic priceis high, the opposite is true.II. The Winners and Losers from TradeA. We can use welfare analysis to determine who will gain and who will lose if free tradebegins in Isoland.B. We will assume that, because Isoland would be such a small part of the market for steel,they will be price takers in the world economy. This implies that they take the worldprice as given and must sell (or buy) at that price.C.The Gains and Losses of an Exporting CountryFigure 21. If the world price is higher than the domestic price, Isoland will export steel.Once free trade begins, the domestic price will rise to the world price.2. As the price of steel rises, the domestic quantity of steel demanded will fall andthe domestic quantity of steel supplied will rise. Thus, with trade, the domesticquantity demanded will not be equal to the domestic quantity supplied.Have students come to the board and label the areas of consumer and producersurplus after you have drawn each of the figures. This should not be a problem asthey are likely familiar enough with consumer and producer surplus after completingChapters 7 and 8.Chapter 9/Application: International Trade 1773. Welfare Before Tradea. Consumer surplus is equal to: A + B.b. Producer surplus is equal to: C.c. Total surplus is equal to: A + B + C.4. Welfare After Tradea. Consumer surplus is equal to: A.b. Producer Surplus is equal to: B + C + D.c. Total surplus is equal to: A + B + C + D.5. Changes in Welfarea. Consumer surplus changes by: –B.b. Producer surplus changes by: +(B + D).c. Total surplus changes by: +D.6. When a country exports a good, domestic producers are better off and domesticconsumers are worse off.7. When a country exports a good, total surplus is increased and the economicwell-being of the country rises.D. The Gains and Losses of an Importing Country178Chapter 9/Application: International Trade1. If the world price is lower than the domestic price, Isoland will import steel.Once free trade begins, the domestic price will fall to the world price.2.As the price of steel falls, the domestic quantity of steel demanded will rise andthe domestic quantity of steel supplied will fall.a. Thus, with trade, the domestic quantity demanded will not be equal tothe domestic quantity supplied.b. Isoland will import the difference between the domestic quantitydemanded and the domestic quantity supplied.Note that there will be both imported and domestically produced steel sold in thiscountry. This is generally true for many imported goods.Chapter 9/Application: International Trade 1793.Welfare Before Trade a. Consumer surplus is equal to: A. b. Producer surplus is equal to: B + C. c.Total surplus is equal to : A + B + C.4. Welfare After Trade a. Consumer surplus is equal to: A + B + D.b. Producer surplus is equal to: C.c.Total surplus is equal to: A + B + C + D.5. Changes in Welfare a. Consumer surplus changes by: +(B + D). b. Producer surplus changes by: –B. c.Total surplus changes by: +D.6.When a country imports a good, domestic consumers are better off and domestic producers are worse off.7.When a country imports a good, total surplus is increased and the economic well-being of the country rises.E. Trade policy is often contentious because the policy creates winners and losers. If thelosers have political clout, the result is often trade restrictions such as tariffs and quotas.180 Chapter 9/Application: International TradeF. The Effects of a Tariff1. Definition of tariff: a tax on goods produced abroad and solddomestically.2.A tariff raises the price above the world price. Thus, the domestic price of steel will rise to the world price plus the tariff.3.As the domestic price rises, the domestic quantity of steel demanded will fall and the domestic quantity of steel supplied will rise. The quantity of imports will fall and the market will move closer to the domestic market equilibrium that occurred before trade.4.Welfare Before the Tariff (with trade) a. Consumer surplus is equal to: A + B + C + D + E + F.b. Producer surplus is equal to: G.c. Government revenue is equal to: zero.d.Total surplus is equal to: A + B + C + D + E + F + G.5.Welfare after Tariff a. Consumer surplus is equal to: A + B. b.Producer surplus is equal to: C + G.Chapter 9/Application: International Trade 181c. Government revenue is equal to: E.d.Total surplus is equal to: A + B + C + E + G.6.Changes in Welfare a. Consumer surplus changes by: –(C + D + E + F). b. Producer surplus changes by: +C. c.Government revenue changes by: +E.d.Total surplus changes by: –(D + F).7. In the News: Life in Isolanda.In 2002, President Bush imposed a tariff of up to 30 percent on most types of steel imported into the United States from Europe, Asia, and South America.b.This is an article from The New York Times discussing the possible results of the President’s actions.G.The Effects of an Import Quota1. Definition of import quota: a limit on the quantity of a good that can beproduced abroad and sold domestically.182 Chapter 9/Application: International Trade2. An import quota alters the supply of steel available. The supply is no longerperfectly elastic at the world price, but is equal to the domestic supply plus thequota amount.3. The domestic price will rise, the domestic quantity of steel demanded will fall andthe domestic quantity of steel supplied will rise. The quantity of imports will falland the market will move closer to the domestic market equilibrium thatoccurred before trade.4. Welfare Before Import Quota (with trade)a. Consumer surplus is equal to: A + B + C + D + E' + E" + F.b. Producer surplus is equal to: G.c. License-holder surplus is equal to: zero.d. Total surplus is equal to : A + B + C + D + E' + E" + F + G.5. Welfare After Import Quotaa. Consumer surplus is equal to: A + B.b. Producer surplus is equal to: C + G.c. License-holder surplus is equal to: E' + E".d. Total surplus is equal to: A + B + C + E' + E" + G.5. Changes in Welfarea. Consumer surplus changes by: –(C + D + E' + E" + F).b. Producer surplus changes by: +C.c. License-holder surplus changes by: +(E' + E").d. Total surplus changes by: –(D + F).G. Comparison of Quota with Tariff1. Both tariffs and quotas raise the domestic price of the good, reduce the welfareof domestic consumers, increase the welfare of domestic producers, and causedeadweight losses.2. A tariff raises revenue for the government, whereas a quota creates surplus forlicense holders.3. A quota can potentially cause a larger deadweight loss than a tariff, dependingon the mechanism used to allocate the import licenses.H. The Lessons for Trade Policy1. If trade is allowed, the price of steel will be driven to the world price. If thedomestic price is higher than the world price, the country will import and thedomestic price will fall. If the domestic price is lower than the world price, thecountry will export and the domestic price will rise.2. If a country imports a product, domestic producers are made worse off, domesticconsumers are made better off, and the gains of consumers outweigh the lossesof producers. If a country exports a product, domestic producers are madebetter off, domestic consumers are made worse off, and the gains of producersoutweigh the losses of consumers.3. Both a tariff and an import quota would create a deadweight loss because totalsurplus would fall.I. FYI: Other Benefits of International Trade1.In addition to increasing total surplus, there are several other benefits of freetrade.2.These include an increased variety of goods, lower costs through economies ofscale, increased competition, and an enhanced flow of ideas.III. The Arguments for Restricting TradeA. The Jobs Argument1. If a country imports a product, domestic producers of the product will have tolay off workers because they will decrease domestic output when the pricedecreases to the world price.2. Free trade, however, will create job opportunities in other industries where thecountry enjoys a comparative advantage.B. The National-Security Argument1. Certain industries may produce key resources needed to produce productsnecessary for national security.2. In many of the cases for which this argument is used, the role of the particularmarket in providing national security is exaggerated.C. The Infant-Industry Argument1. New industries need time to get established to be able to compete in worldmarkets.2. Even if this argument is legitimate, it is nearly impossible for the government tochoose which industries will be profitable in the future and it is even moredifficult to remove tariffs or quotas in an industry once they are in place.D. The Unfair-Competition Argument1. It is unfair if firms in one country are forced to comply with more regulationsthan firms in another country, or if another government subsidizes theproduction of a good.2. Even if another country is subsidizing the production of a product so that it canbe exported to a country at a lower price, the domestic consumers who importthe product gain more than the domestic producers lose.E. The Protection-As-A-Bargaining-Chip Argument1. Threats of protectionism can make other countries more willing to reduce theamounts of protectionism they use.2. If the threat does not work, the country has to decide if it would rather reducethe economic well-being of its citizens (by carrying out the threat) or losecredibility in negotiations (by reneging on its threat).F. In the News: Trade Policy in India1. Because of lobbying from its domestic poultry industry, the government of Indiaincreased the tariff on chicken legs from 33 percent to 100 percent.2. This is an article from The New York Times discussing this situation.G. Case Study: Trade Agreements and the World Trade Organization1. Countries wanting to achieve freer trade can take two approaches to cuttingtrade restrictions: a unilateral approach or a multilateral approach.2. A unilateral approach occurs when a country lowers its trade restrictions on itsown. A multilateral approach occurs when a country reduces its traderestrictions while other countries do the same.3. The North America Free Trade Agreement (NAFTA) and the General Agreementon Tariffs and Trade (GATT) are multilateral approaches to reducing tradebarriers.4. The rules established under GATT are now enforced by the World TradeOrganization (WTO).5. The functions of the WTO are to administer trade agreements, provide a forumfor negotiation, and handle disputes that arise among member countries.H. In the News: Globalization1.In recent years, there has been a vocal outcry against globalization among manygroups.2.This is an article written by economist Paul Krugman for The New York Timesarguing that these groups are misinformed.SOLUTIONS TO TEXT PROBLEMS:Quick Quizzes1. Since wool suits are cheaper in neighboring countries, Autarka would import suits if it were toallow free trade.2. Figure 1 shows the supply and demand for wool suits in Autarka. With no trade, the price ofsuits is 3 ounces of gold, consumer surplus is area A, producer surplus is area B + C, and totalsurplus is area A + B + C. When trade is allowed, the price falls to 2 ounces of gold, consumer surplus rises to A + B + D (an increase of B + D), producer surplus falls to C (a decline of B), so total surplus rises to A + B + C + D (an increase of D). A tariff on suit imports would reduce the increase in consumer surplus, reduce the decline in producer surplus, and reduce the gain in total surplus.Figure 13. Lobbyists for the textile industry might make five arguments in favor of a ban on the import ofwool suits: (1) imports of wool suits destroy domestic jobs; (2) the wool-suit industry is vital for national security; (3) the wool-suit industry is just starting and needs protection from foreigncompetition until it gets started; (4) other countries are unfairly subsidizing their wool-suitindustries; and (5) the ban on wool suits can be used as a bargaining chip in internationalnegotiations.In defending free trade in wool suits, you could argue that: (1) free trade creates jobs in some industries even as it destroys jobs in the wool-suit industry and allows Autarka to enjoy a higher standard of living; (2) the role of wool suits for the military is probably exaggerated; (3)government protection is not needed for an industry to grow on its own; (4) it would be good for Autarka to buy wool suits at a subsidized price; and (5) threats against free trade may backfire, leading to lower levels of trade and lower economic welfare for everyone.Questions for Review1. If the domestic price that prevails without international trade is above the world price, thecountry does not have a comparative advantage in producing the good. If the domestic price is below the world price, the country has a comparative advantage in producing the good.2. A country will export a good for which its domestic price is lower than the prevailing world price.Thus, if a country has a comparative advantage in producing a good, it will become an exporter when trade is allowed. A country will import a product for which its domestic price is greaterthan the prevailing world price. Thus, if a country does not have a comparative advantage inproducing a good, it will become an importer when trade is allowed.3. Figure 2 illustrates supply and demand for an importing country. Before trade is allowed,consumer surplus is area A and producer surplus is area B + C. After trade is allowed, consumer surplus is area A + B + D and producer surplus is area C. The change in total surplus is anincrease of area D.Figure 24. A tariff is a tax on goods produced abroad and sold domestically. If a country is an importer of agood, a tariff reduces the quantity of imports and moves the domestic market closer to itsequilibrium without trade, increasing the price of the good, reducing consumer surplus and total surplus, while raising producer surplus and government revenue.5. An import quota is a limit on the quantity of a good that can be produced abroad and solddomestically. Its economic effects are similar to those of a tariff, in that an import quota reduces the quantity of imports and moves the domestic market closer to its equilibrium without trade,increasing the price of the good, reducing consumer surplus and total surplus, while raisingproducer surplus. However, a tariff raises revenue for the government while an import quotacreates surplus for license holders.6. The arguments given to support trade restrictions are: (1) trade destroys jobs; (2) industriesthreatened with competition may be vital for national security; (3) new industries need traderestrictions to help them get started; (4) some countries unfairly subsidize their firms, socompetition isn't fair; and (5) trade restrictions can be useful bargaining chips. Economistsdisagree with these arguments: (1) trade may destroy some jobs, but it creates other jobs; (2) arguments about national security tend to be exaggerated; (3) the government cannot easilyidentify new industries that are worth protecting; (4) if countries subsidize their exports, doing so simply benefits consumers in importing countries; and (5) bargaining over trade is a riskybusiness, since it may backfire, making the country worse off without trade.7. A unilateral approach to achieving free trade occurs when a country removes trade restrictions onits own. Under a multilateral approach, a country reduces its trade restrictions while othercountries do the same, based on an agreement reached through bargaining. The unilateralapproach was taken by Great Britain in the 1800s and by Chile and South Korea in recent years.Example of the multilateral approach include NAFTA in 1993 and the GATT negotiations sinceWorld War II.Problems and Applications1. a. In Figure 3, with no international trade the equilibrium price is P1 and the equilibriumquantity is Q1. Consumer surplus is area A and producer surplus is area B + C, so totalsurplus is A + B + C.Figure 3b. When the U.S. orange market is opened to trade, the new equilibrium price is P W, thequantity consumed is Q D, the quantity produced domestically is Q S, and the quantityimported is Q D– Q S. Consumer surplus increases from A to A + B + D + E. Producersurplus decreases from B + C to C. Total surplus changes from A + B + C to A + B + C+ D + E, an increase of D + E.2. a. Figure 4 illustrates the U.S. market for wine, where the world price of wine is P1. Thefollowing table illustrates the results under the heading "P1."Figure 4b. The shift in the Gulf Stream destroys some of the grape harvest, raising the world priceof wine to P2. The table shows the effects on consumer, producer, and total surplus,under the heading "P2" and the change in the surplus measures under the heading"CHANGE." Consumers lose, producers win, and the United States as a whole is worseoff.3. Figure 5 shows the market for cotton in countries A and B. Note that the world price of cotton isthe same in both countries. Country A imports cotton from country B. The table below showsthat total surplus is higher in both countries. However, in country A, consumers are better offand producers are worse off, while in country B, consumers are worse off and producers arebetter off.Figure 54. The impact of a tariff on imported autos is shown in Figure 6. Without the tariff, the price of anauto is P W, the quantity produced in the United States is Q1S, and the quantity purchased in the United States is Q1D. The United States imports Q1D– Q1S autos. The imposition of the tariffraises the price of autos to P W + t, causing an increase in quantity supplied by U.S. producers to Q2S and a decline in the quantity demanded to Q2D, thus reducing the number of imports to Q2D–Q2S. The table shows the impact on consumer surplus, producer surplus, government revenue, and total surplus both before (OLD) and after (NEW) the imposition of the tariff, as well as the change (CHANGE). Since consumer surplus declines by C+D+E+F while producer surplus rises by C and government revenue rises by E, the deadweight loss is D+F. The loss of consumersurplus in the amount C+D+E+F is split up as follows: C goes to producers, E goes to thegovernment, and D+F is deadweight loss.Figure 65. a. The world wheat price must be below the U.S. no-trade price, because wheat farmersoppose NAFTA. They oppose it because they know that when trade is allowed, the U.S.price of wheat will decline to the world price, and their producer surplus will fall. Theworld corn price must be above the U.S. no-trade price, since corn farmers supportNAFTA. They know that when trade is allowed, the U.S. price of corn will rise to theworld price, and their producer surplus will rise.b. Considering both markets together, NAFTA makes wheat farmers worse off and cornfarmers better off, so it isn't clear whether farmers as a whole gain or lose. Similarly,consumers of wheat gain (since the price of wheat will decline) and consumers of cornlose (since the price of corn will rise), so consumers as a whole may either gain or lose.However, we know that the total gains from trade are positive, so the United States as awhole is better off.6. The tax on wine from California is just like a tariff imposed by one country on imports fromanother. As a result, Washington producers would be better off and Washington consumerswould be worse off. The higher price of wine in Washington means producers would producemore wine, so they would hire more workers. Tax revenue would go to the government ofWashington. So both claims are true, but it is a bad policy because the losses to Washingtonconsumers exceed the gains to producers.7. Senator Hollings is correct that the price of clothing is the world price. When trade is allowed,the domestic price of clothing is driven to the world price. The price is lower than it would be in the absence of trade, so consumer surplus is higher than it would be without trade and thismeans that consumers do benefit from lower-priced imports.8. a. In support of the policy that the government should not allow imports if foreign firms areselling below their costs of production (dumping), you could argue that dumping is anattempt to drive domestic producers out of business, after which the foreign firms wouldhave a monopoly position and raise their prices. Criticism of this policy could include theargument that if foreign governments want to subsidize our consumption by sellinggoods to us below their cost of production, we benefit and they lose, so that is a goodthing for us. The argument about gaining monopoly power isn’t an issue if the costs ofnew firms entering the industry is low. The dumping argument is often used by domesticfirms when foreign firms have a comparative advantage in that industry, so protectingthem reduces social welfare.b. In support of the policy that the government should temporarily stop the import of goodsfor which the domestic industry is new and struggling to survive, you could argue thatonce the domestic industry gets going it will be able to be profitable and compete withforeign firms. But criticism of the policy could include the arguments that thegovernment would have to pick which industries might survive in the future (somethingthe government is not likely to be good at doing, since it is likely to be determinedpolitically), such protection is hard to remove in the future, and because the privatesector itself can take care of infant industries by giving them capital even as they arestarting out. Again, this type of policy is often proposed by domestic firms in industries。
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Chapter 9Work T eams & GroupsI. What is a “Group”? P.290A group refers to two or more people with common interests, objectives andcontinuing interaction. It is often composed of diverse (different) people. It emphasizes on individual leadership, individual accountability and individual work products.II. What is a “Team”?It is a small number of people with complementary skills who are committed to a common mission, performance goals, and approach. It emphasize on shared leadership, mutual accountability, and collective work products. A team in an organization is a key to enhance quality and achieve success.III. A. Characteristics of a Well-Functioning Effective Group (P.290, Table 9.1)-The atmosphere tends to be relaxed, comfortable & informal.-The group’s task is well understood and accepted by the members.-The members listen well to one another; most members participate in a good deal of task-relevant discussion.-People express both their feelings and their ideas.-Conflict and disagreement are present and centered around ideas or methods, not personalities or people.-The group is aware and conscious of its own operation & function.-Decisions are usually based on consensus, not majority vote.-When actions are decided, clear assignments are made and accepted by members of the group.B. Four Types of Group Behavior :(1)Norms of Behavior – The standards that a work group uses to evaluate thebehavior of its members. These norms may be written or unwritten,verbalized or not verbalized, implicit or explicit. Norms may specify whatmembers of a group should do, should not do. Norms can be effective ininfluencing a person’s behavior in a group.(2)Group Cohesion –The “interpersonal glue” that makes members of agroup stick together. High cohesive group usually shows good, close relationships, members enjoy job satisfaction and improve organizational productivity.(3)Social Loafing (free-rider) –The failure of a group member to contributepersonal time, effort, thoughts, or other resources to the group.(4)Loss of Individuality – A social process in which individual groupmembers lose self-awareness & its accompanying sense of accountability and responsibility for individual behavior.C. Four Stages of Group Formation :(1)Mutual Acceptance : Focus is on the interpersonal relations among themembers. Members assess one another with regard to trustworthiness, emotional comfort and evaluative acceptance.(2)Decision Making : Focus is on decision-making activities related to tasks.The group must make decisions about what task is and how to do it.(3)Motivation & Commitment : Focus on self-motivation andgroup-motivation, the execution and achievement of the task.(4)Control and Sanctions (approval) : Focus on effective, efficient unit.D. Characteristics of a Mature Group :-Clear purpose or mission-Well-understood set of norms of behavior-High level of cohesion-Clear but flexible, status structure of leader-follower relationshipsIV. Task and Maintenance Functions in Groups / Teams : (P.299, Table 9.2)(1)Task Functions : Those activities directly related to the effectivecompletion of the team’s work.Examples of those activities are :-Initiating activities-Seeking information-Giving information-Elaborating concepts-Coordinating activities-Summarizing ideas-Testing ideas-Evaluating effectiveness-Diagnosing problems(2)Maintenance Functions : Those activities essential to the effective,satisfying interpersonal relationships within a team or group.Examples of those activities are :-Supporting others-Following other s’ leads-Gatekeeping communication-Setting standards-Expressing member feelings-Testing group decisions-Consensus testing-Harmonizing conflict-Reducing tensionV. A. Quality Teams & Circles P.303(1)Quality Circles (QCs) : It is a small group of employees who workvoluntarily on company time, typically one hour per week, to addresswork-related problems. Work-related problems refer to quality control,cost reduction, production planning & techniques and even productdesign.(2)Quality Teams (QTs) : A team tha t is part of an organization’s structure &is empowered to act on its decisions regarding product & quality service.*The Differences between Quality Teams & QCs are :-QTs are more formal than QCs-QTs are assigned & designed by top management-QTs are not voluntary & possess formal power than QCsB. Two sets of Social Benefits of teams :(1)Psychological Intimacy : Emotional & psychological closeness to otherteam or group members. It results in feelings of affection and warmth,unconditional positive regard, opportunity for emotional expression,openness, security and emotional support, & giving and receivingnurturance.(2)Integrated Involvement : It is achieved through tasks and activities. Itresults in enjoyable and involving activities, social identity andself-definition and opportunity for power and influence.VI. Empowerment (Sharing power within an organization) P.306When top manager wants to delegate work and give power to his subordinates, there are certain requirements on the subordinates :-Competence skills : They should have mastery and experience in that discipline & profession.-Process skills : They should possess negotiating skills with allies, opponents and adversaries (difficult and dangerous people).-Cooperative and helping behaviors : They should be cooperative people who are motivated to maximize the gains for everyone on the team. They shouldengage in encouraging, helpful behavior among the team members.-Communication skills : They should have communication skills that include self-expression and active listener.。