A self-phase modulated oscillator and some implications

A self-phase modulated sinewave oscillator is proved to perform as a periodic function generator. The system is investigated comprehensively and is shown to be capable of generating a variety of non-sinusoidal waveforms. The change from the generation of one waveform to the generation of another is attained by the variation of a relatively simple function in a skeletal model which does not change.     

The Relationship of Locus of Control and Metacognitive Knowledge of Math with Math Achievements

The purpose of the research was to examine the correlation between locus of control and metacognitive knowledge in math and math achievement among students with learning disabilities. We examined 30 eighth grade pupils with learning disabilities and 30 other pupils all of whom studied in a heterogeneous class in a public school in order to better understand the extent to which the variables: metacognitive knowledge, locus of control and achievement in math differed in the two populations. The pupils answered three questionnaires: the first was designed to study the locus of control, the second, to investigate metacognitive knowledge and the third, to measure math achievement. The findings of this study indicate that the higher the level of the internal locus of control, the higher the use of metacognitive knowledge. Furthermore, higher levels of internal locus of control and higher use of metacognitive knowledge resulted in increased math achievement.