一种基于颜色特征的图片资料检索方法

基于内容的图像检索方法是目前有效查询大量图片资料的关键技术。首先论述了利用面向对象的多媒体数据处理技术，构建一个基于内容的图像检索系统的方法；重点讨论了图像颜色特征提取的改进算法，系统通过该算法以及和其他图像检索方法的配合使用，实现了图书馆数字图片资料的快速检索。     

多通道SAR空时二维杂波模拟研究

多通道合成孔径雷达（SAR）空时自适应处理是抑制地面杂波的有效方法,而空时二维滤波器的权值求取离不开杂波协方差矩阵的估计。从多通道SAR回波模型出发,提出了一种基于二维FFT的多通道SAR原始数据频域模拟方法,并根据该方法模拟出的多通道数据对空时二维协方差矩阵进行了估计。仿真结果显示,该方法在有效降低运算量的情况下保持了数据的真实性,良好地反映了多通道SAR的空时二维杂波特性。     

High school preparation for college biology in Israel

The study reports the results of a questionnaire on the opinions of biology, medical and agricultural students regarding the nature of the contribution of high school biology to their study of biology in the university. It was found that most students value the contribution of high school biology to their learning, understanding and retention of new material. Students who specialized in high school biology and who studied an inquiry-oriented program in high school had definite advantages over the others. High school experiences were found to influence achievement in college biology to the extent to which the university courses were based upon prior knowledge.     

浅谈英语教学的“有效教育”

“有效教育”如火如荼地开展起来了,我从观望到投入,深刻体会到了这一教学方式的强大威力。“有效教育”以其前瞻性、实用性和创造性,为我们工作在一线的教师带来了视觉和操作上前所未有的冲击和震撼,我从开始的疑虑到尝试,再到实践中的感悟、惊喜,如同经历了一场心灵的洗礼。