作者t0444564 (艾利欧)
看板NTU-Exam
标题[试题] 102下 薛克民 应用数学方法 期末考
时间Thu Jun 19 23:36:45 2014
课程名称︰应用数学方法
课程性质︰数学系选修、数学研究所选修、应用数学科学研究所选修
课程教师︰薛克民
开课学院:理学院
开课系所︰数学系
考试日期︰2014年06月19日(四),15:30-18:00
考试时限:150分钟
是否需发放奖励金:是
试题 :
National Taiwan University Spring Semester, 2014
MATH 7421 Method of Applied Mathematics
Final exam.
Date: 15:30-17:30, June 19th, 2014
˙Open books
˙total scores: 100 points
Consider the boundary-value problem
2
d u m du n
ε ----- + x ---- - x u = 0, 0<=x<=1, ε<<1, (1)
dx2 dx
u(0) = α, u(1) = β,
where m in Z, n in Z, α in real, β in real are parameters; α≠β≠0.
(a) (40 points) Assume m = n = 1, use the method of matched asymptotic
expansions to determine the first-order asymptotic solution of (1).
(b) (40 points) Verify your result in (a) by employing WKB theory.
(c) (20 points) More generally, under what conditions on m and n will there be
a boundary later at the origin?
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