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如何顺利地帮助高一新生完成从初中到高中阶段的过渡衔接一直以来都是教师关注的问题。如何让高一学生顺利完成从初中阶段到高中阶段英语学习的过渡衔接,是每个高中英语教师必须首先解决的问题。要顺利完成这一过渡环节,作者认为初高中英语的衔接,一方面是学生本人要把握的重要过渡期———初中基础较好的学生进入高一尚且遇到许多困难,基础欠缺面大的学生更是困难多多,阻力重重。另一方面是高中英语教师要如何帮助初中各类学生做好迈进高一的这一步,促使学生提高和保持英语学习兴趣,使得教师在今后的教学中轻松教学,使学生学得愉快而且有所收获。 相似文献
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In this paper, a collection of three-dimensional(3D)numerical breast models are developed based on clinical magnetic resonance images(MRIs). A hybrid contour detection method is used to create the contour, and the internal space is filled with different breast tissues, with each corresponding to a specified interval of MRI pixel intensity. The developed models anatomically describe the complex tissue structure and dielectric properties in breasts. Besides, they are compatible with finite-difference-time-domain(FDTD)grid cells. Convolutional perfect matched layer(CPML)is applied in conjunction with FDTD to simulate the open boundary outside the model. In the test phase, microwave breast cancer detection simulations are performed in four models with varying radiographic densities. Then, confocal algorithm is utilized to reconstruct the tumor images. Imaging results show that the tumor voxels can be recognized in every case, with 2 mm location error in two low density cases and 7 mm─8 mm location errors in two high density cases, demonstrating that the MRI-derived models can characterize the individual difference between patients' breasts. 相似文献
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