this paper investigates on control and stabilization of a new hyperchaotic system. the hyperchaotic system is stabilized using a new technique which called generalized backstepping method (gbm). because of its similarity to backstepping approach, this method is called gbm. but, this method is more applicable in comparison with conventional backstepping.  backstepping method is used only for sys...

One skill that student teachers need to develop during their academic studies is the capacity to produce accurate and well-organized texts. This study reports on the comparative impact of metalinguistic feedback (MLF), teacher interactive feedback (TIF(, and the peer-feedback (PF) on the accuracy and organization of postgraduate ELT student teachers’ writing. The participants were 57 postgradua...

Using the differential-geometric control theory, we present in this note a necessary and sufficient condition under which an affine system is locally feedback equivalent to, via a change of coordinates and restricted smooth state feedback, a generalized normal form called —normal form, which includes Brunovsky canonical form and feedback linearizable systems in a lower-triangular form as its sp...

New control procedures for finite-time stabilization of discrete-time nonlinear systems in the strict-feedback form are proposed. The proposed designs enjoy properties being dependent on one design parameter and ability to bring state vector origin finite time. Moreover, settling-time functions estimated terms initial unique that regulates rate convergence. Finally, a trajectory-tracking algori...

the bulk of research within the interactionist framework seems to be consensually pointing to the beneficial effects of interaction in sla. however, few studies have investigated the role of training in providing and perceiving interactional feedback, especially among young learners. this study probed the effects of training prior to engagement in interaction in case of young learners acquiring...

this study is a typological description of written formative feedback in an efl context in iran. twenty m.a. students of tefl participated in the study. they were required to summarize a scholarly article in each session on which the instructor would provide written corrective feedback (cf). written formative comments were extracted, coded, and categorized into various types, such as asking for...