Received 10 September 2015; accepted 17 January 2016; published 20 January 2016
In this paper, we are going to obtain the asymptotic bounds for the following parameterized singularly perturbed boundary value problem (BVP):
where is the perturbation parameter, are given constants and is a sufficiently smooth function in. Further, the function is assumed to be sufficiently continuously differentiable for our purpose function in and
By a solution of (1.1), (1.2), we mean pair for which problem (1.1), (1.2) is satisfied.
An overview of some existence and uniqueness results and applications of parameterized equations may be obtained, for example, in  -  . In  -  have also been considered some approxi-mating aspects of this kind of problems. The qualitative analysis of singular perturbation situations has always been far from trivial because of the boundary layer behavior of the solution. In singular perturbation cases, problems depend on a small parameter in such a way that the solution exhibits a multiscale character, i.e., there are thin transition layers where the solution varies rapidly while away from layers it behaves regularly and varies slowly  - . In this note, we establish the boundary layer behaviour for of the solution of (1.1)-(1.2) and its first and second derivatives. Example that agrees with the analytical results is given.
2. The Continuous Problem
Lemma 2.1. Let and be the continuous functions on. Then, the solution of the boundary-value problem
satisfies the inequality
Proof. Under the above conditions, the operatör admits the folloving maximum principle:
Suppose be any function satisfiying , and. Then, for all.
Now, for the barrier fonction
taking also into consideration that, is a solution of the problem
it follows that,
therefore, which immediayely leads to (2.3).
Remark 1. The inequality (2.3) yields.
Theorem 2.1. For and under conditions (1.3), the solution of the problem (1.1), (1.2), satisfies,
provided and for and.
Proof. We rewrite Equation (1.1) in form
where, intermediate values.
From (2.8) for the first derivate, we have
from which, after using the initial condition, it follows that,
Applying the mean value theorem for integrals, we deduce that,
Also, for first and second terms in right side of (2.10) for values, we have
It then follows from (2.11)-(2.13),
Further from (2.4) by taking we get
The inequlities (2.14), (2.15) immediately leads to (2.5), (2.6). After taking into consideration the uniformly boundnees in of and, it then follows from (2.9) that,
which proves (2.7) for. To obtain (2.7) for, first from (1.1) we have
from which after taking into consideration here and (2.5) we obtain
Next, differentiation (1.1) gives
and due to our assumptions clearly,
Consequently, from (2.17), (2.18) we have
which proves (2.7) for. □
Example. Consider the following parameterized singular perturbation problem:
and selected so that the solution is
First and second derivatives have the form
Therefore, we observe here the accordance in our theoretical results described above.
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