5.1 Introduction The properties of airfoils are the same as the properties of a wing with infinite span. However, all real airplanes have wings of finite span. In the present chapter, we will apply our knowledge of airfoil properties to the analysis for finite wings. As we have mentioned in the previous chapter, the analysis for the aerodynamics of wings is separated in two steps.now, we are going on the second-step in Prandtl's philosophy of wing theory

一、一维定积分计算的平均值法(期望值估计法)。 一维积分计算=f(x)dx0≤x≤1,osf(x)s1在x的定义域[0,1]上均匀地随机取点该均匀分布的随机变量记为ξ。我们定义一个随机变量η为n=f(5)

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Economist.comOPINION Economics focus Stop worrying and love the deficit Nov 27th 2003 From The Economist print edition America's current-account deficit poses few dangers, says Alan Greenspan. Except to Europeans IN THE past year the United States has run up a current-account deficit of more than $500 billion. Some think that the line of credit extended by the res

From The Economist print edition Why the world cannot count on a repeat of the 1980s PARALLELS abound between Ronald Reagan and George Bush. Like the Gipper, Dubya is a sun- belt conservative with fondness for his ranch. In all, Mr Reagan spent about one year of his eight-year presidency at his California retreat. Mr Bush has turned his patch of Texan scrub near Crawford into the hottest destination for world leaders

The world economy needs both TO GET a sense of the challenges facing the global economy, fast-forward four years to September 2007 and consider the following three scenarios: he world's top finance ministers arrive in Washington for an emergency summit after the

Home What's New Site Map Site Index International Monetary Fund Search About the IMFIMF at Work IMF Finances Country Info News Publications An Open Letter By Kenneth Rogoff Economic Counsellor and Director of Research. International Monetary Fund To Joseph Stiglitz

Nagging doubts about the benefits of globalisation, and a look at the evidence WHEN David Ricardo, a 19th-century economist, criticised England's protectionist corn laws, he based his argument on the notion of \comparative costs\,these days called comparative advantage The idea, in brief, is that all countries can raise their living standards through specialisation and trade. Even if one country