关于高一数学教学改革的探讨

关于高一数学教学改革的探讨郭耿荣，王海赳，龙云祥（江苏省苏州实验中学２１５０１１）（吴县木读中学）江苏省一九九一年秋季入学的重点中学的高一学生，使用的课本不再是甲种本，而改用必修本．教学课时为每周五节．既要大面积提高教学质量，又要减轻学生的学习负担，...     

Some properties on far-field pattern of scattering by penetrable obstacle in ocean waveguide

This paper is concerned with the properties of propagation fax-field patterns corresponding to the scattering of time harmonic acoustic waves by a bounded penetrable obstacle in an ocean waveguide. The sets of solutions to the transmission problem are constructed such that the restriction of these solutions to the boundary of the penetrable obstacle is dense in a Hilbert space. Then conditions under which a set of propagation far-field patterns is complete in a Hilbert space are determined. These properties are important in investigating inverse transmission problems in an ocean waveguide.