肖斯塔科维奇

(Shostakovitch,D.D.1906-1975)苏联作曲家、苏联音乐界的主要代表人物。1906年6月25日生于彼得堡一个化学工程师家庭。自幼学习音乐,十四岁开始作曲,入列宁格勒音乐学院,从尼古拉耶夫·吏丹伯以及格拉诸诺     

Is Mathematics T.I.R.E.D? A Profile of Quiet Disaffection in the Secondary Mathematics Classroom

Research often focuses on disaffection in the mathematics classroom as evident in disruptive behaviour, absenteeism or special needs: thus, it ignores a group of students whose disaffection is expressed in a tacit, non‐disruptive manner, namely as disengagement and invisibility. Ignoring this often large group implies that the math ematical potential of these learners may remain defunct. This article reports on a one‐year study of quiet disaffection conducted in three Year 9 mathematics classrooms in Norfolk. Through extensive observation and interviewing of seventy 13/14 year‐old pupils, a profile of quiet disaffection from secondary school mathematics was constructed. It is proposed that its characteristics include: Tedium, Isolation, Rote learning (rule‐and‐cue following), Elitism and Depersonalisation. The proposed characteristics are described and exemplified. Finally, the themes that emerged from the students' statements about their images of effective mathematics teaching (Nature of Classroom Activities—the notion of ‘Fun’, Teaching Styles; Role of the Teacher; Role of Stratification Structures such as Setting) are outlined.     

信号发生器中D／A转换器接口技术的探讨

D／A转换器是将单片微型计算机送来的数字信号,经转换后变为模拟信号进行输出,DAC0832可以方便地产生各种输出波形,在单片机接口技术中得到了广泛的应用。