in this thesis our aim is to construct vector field in r3 for which the corresponding one-dimensional maps have certain discontinuities. two kinds of vector fields are considered, the first the lorenz vector field, and the second originally introced here. the latter have chaotic behavior and motivate a class of one-parameter families of maps which have positive lyapunov exponents for an open in...

Muslim ophthalmologists have made significant achievements in the field of ophthalmology in all Islamic lands and territories, especially in Andalusia. Andalusian scientists have written several works related to medicine and ophthalmology that introduce us to their activities in this field. The main purpose of this study is to review the activities performed in Andalusia regarding ophthalmology...

Background and Aim: Generally, where learning and teaching concerns,   instructional technology’s presence had been certain. Instructional technology by having the standards and components of a profession needs ethics. Therefore, as a professional, an instructional technologist has to yield to ethical criteria, knowledge, standards, and appreciate ethical responsibilities in order to succeed. T...

two groups of students were assigned as experimental and control ones, and were given instruction on directed reading-thinking activities and after some treatment, they were post-tested. although the initial pre-test did not show any significant differences, the final post-test result revealed that the cooperative reading comprehension helped the experimental group. the cooperative students’...