Under the Egyptian program for radiation safety and control, airborne radioactivity measurements and radiological dose assessment were conducted in some phosphate and uranium mines. Abu-Tartor mine is one of the biggest underground phosphate mines in Egypt. Airborne radioactivity, radon ((222)Rn) and its short-lived decay products (progenies) and thoron ((220)Rn), were measured in selected loca...

1 eceived August 5, 2003; evised and accepted ovember 18, 2003. eprint requests: Tarun ain, M.D., Department of bstetrics and ynecology, University of llinois at Chicago, 820 outh Wood Street, hicago, Illinois 60612 FAX: 312-996-4238; Eail: [email protected]). Division of Reproductive ndocrinology and nfertility, Department of bstetrics and ynecology, Brigham and omen’s Hospital, Harvard edical...

We describe light-reflection properties of spherically curved mirrors, like balls in the Christmas tree. In particular, we study the position of the image which is formed somewhere beyond the surface of a spherical mirror, when an eye observes the image of a pointlike light source. The considered problem, originally posed by Abu Ali Hasan Ibn al-Haitham — alias Alhazen — more than a millennium ...

We describe light-reflection properties of spherically curved mirrors, like balls in the Christmas tree. In particular, we study the position of the image which is formed somewhere beyond the surface of a spherical mirror, when an eye observes the image of a pointlike light source. The considered problem, originally posed by Abu Ali Hasan Ibn al-Haitham — alias Alhazen — more than a millennium ...

one of the important subjects of comparative literature_ in french school_ is studying common contents between literature of different languages and separating literati’s initiatives and borrowing from other authors in the same or another language by them. with this aspect. using analytic – comparative metod, this study compares poems of abu tayyib al-muttanabbi_ as one of the most impressive a...

our problem in this article is ibn miskawayh’s analysis of the nature of happiness, and its methodology is descriptive- analytic. ibn miskawayh considers happiness as “good” and “perfection” with respect to their holders; so, he establishes some inseparability between happiness, and good and perfection. ibn miskawayh has two definitions for the concept of good. he divides this conception into s...