@Article{cmes.2011.075.205,
AUTHOR = {Zai You  Yan, Qiang  Zhang},
TITLE = {Investigation on the Singularities of Some Singular Integrals},
JOURNAL = {Computer Modeling in Engineering \& Sciences},
VOLUME = {75},
YEAR = {2011},
NUMBER = {3&4},
PAGES = {205--222},
URL = {http://www.techscience.com/CMES/v75n3&4/26809},
ISSN = {1526-1506},
ABSTRACT = {In a boundary element method, the treatment of all the possible singular integrals is very important for the correctness and accuracy of the solutions. Generally, the directional derivative of a weakly singular integral is computed by an integral in the sense of Cauchy principal value if the directional derivative of the weakly singular integral kernel is strongly singular or in the sense of Hadamard finite part integral if it is hypersingular. In this paper, we try to discover how the strongly singular and hypersingular integrals are generated and propose an idea to avoid the appearance of such kind of strongly singular and hypersingular integrals. This idea is termed as the 'exact derivation' of the directional derivative of a weakly singular integral. Using some simple examples, we proof that the directional derivative of a weakly singular integral found by this idea can still be a weakly singular integral. That is none strongly or hypersingular integrals are generated in such a process. Therefore, Cauchy principal value and Hadamard finite part integral are not indispensable.},
DOI = {10.3970/cmes.2011.075.205}
}