Reflections of a paleoaerodynamicist.

Zarathrustrian Mind: Some Comparative Reflections on the Philosophy of Zarathrustra

This paper deals with an essential problem which the modern western thinker faced with and tried to find a solution for that in the benefit of modern humanity. This problem is human reason and his free mind. The author tries here to go back to Zarathrustrian concept of mind and bring forth some fresh reflections in a comparative way. This will let him to evaluate in the main the view that argue...

Use of a Two-Channel Moiré Wavefront Sensor for Measuring Topological Charge Sign of the Vortex Beam and Investigation of Its Change Due to an Odd Number of Reflections

One of the solutions of the Helmholtz equation is the vortex beams. In the recent decades, production and applications of these types of beams have found serious attentions. Determination of the vortex beam topological charge and its sign are very important issues. Odd number of reflections of the vortex beam changes its vorticity. In this paper, we have used a q-plate to generate a vortex beam...

Product preservation and stable units for reflections into idempotent subvarieties

We give a necessary and sufficient condition for the preservation of finite products by a reflection of a variety of universal algebras into an idempotent subvariety. It is also shown that simple and semi-left-exact reflections into subvarieties of universal algebras are the same. It then follows that a reflection of a variety of universal algebras into an idempotent subvariety has stable units...

The Drama of Divine Providence: Reflections on the Problem of Evil

This article studies the problem of evil in Abrahamic religions and philosophical traditions, and tries to restate their solutions in a contemporary language. The author aims at affirming traditional Abrahamic approaches to theodicy that preserve divine omnipotence, benevolence, and omniscience, but without denying the reality of evil.

Reflections on Health Tourism and Cross-Border Health Care