We present a new comparison principle by introducing a notion of upper quasi-monotone nondecreasing and obtain the practical stability criteria for set valued differential equations in terms of two measures on time scales by using the vector Lyapunov function together with the new comparison principle.

The work of science teachers can be viewed from a variety of perspectives. In this article, teaching is seen as an activity in which teachers deliberate in the practical domain to decide on actions and goals. In the first part of the article, it is argued that, because practical reasoning is similar to scientific reasoning, a model of practical conceptual change can be developed that is analogo...

Ethical principles provide general guidelines for professional behavior. Unfortunately, these principles are not adequate for practical decision-making. One ethical principle which generates frequent consternation is that of avoiding dual relationships. Some models have been developed to address this problem, but they are typically general and not especially helpful when specific ethical dilemm...

This paper studies the separation principle for a class of nonlinear timevarying dynamical systems whose dynamics are in general bounded in time. The resultant observer-based state feedback control guarantees practical stability of the state oscillation given that the system is both uniformly controllable and observable. Our separation principle relies on stability results for cascades systems.

How important is the principle of order irrelevance in the development of children’s conceptual knowledge of counting? In Study 1 (N=168), high-skilled kindergarten children were more likely to apply a principle of order relevance to another’s counting than were less-skilled children. In Study 2 (N=239), only the oldest children (Grade 5) showed evidence of applying the principle of order irrel...

Reversible computing has been studied since Rolf Landauer advanced the argument that has come to be known as Landauer's principle. This principle states that there is no minimum energy dissipation for logic operations in reversible computing, because it is not accompanied by reductions in information entropy. However, until now, no practical reversible logic gates have been demonstrated. One of...

normal 0 false false false en-us x-none ar-sa microsoftinternetexplorer4 practical work has an important and time-honored place in the education of students, researchers and engineers. the practical work is the most expensive part of the education. the major goals of practical work are: (i) teaching manual and observational skills relevant to the subjects; (ii) improving understanding of method...