Vacuum evaporated crystalline films of Zinc Selenide (ZnSe) have been characterized by using optical spectroscopy (especially transmission and absorption spectra). Thin films of ZnSe have been deposited by vacuum evaporation technique on highly clean glass substrates and their optical properties such as refractive index (n), extinction coefficient (k), and energy band gap have been studied. The...

The purpose of this paper is to determine what may be said, under favorable conditions, about the algebraic structure of a group of homeomorphisms when a fundamental domain is known. If S is a space and G a group of homeomorphisms acting on S, then the image of a point x in 5 under an element g in G will be denoted by gx. If D is a subset of S, then gD will be the image of D, and if F is a subs...

F A B R I C E M O N N A , * , † , ‡ J O Ë L L A N C E L O T , † I A N W . C R O U D A C E , § A N D R E W B . C U N D Y , | A N D J A M E S T . L E W I S § Laboratoire de Géochimie Isotopique, URA-CNRS 1763, Université de Montpellier II, Place E. Bataillon, Case courrier 066, 34095 Montpellier Cedex 05, France, Department of Geology, Southampton Oceanography Centre, Southampton, SO14 3ZH, U.K.,...

Captan and folpet react with thiophenol in the presence of triethylamine in acetonitrile to form a bis (phenyl) trithiocarbonate which reacts with 2, 4dinitrophenyl hydrazine in the presence of hydrochloric acid to form corresponding hydrazone. The latter is transformed into an intense red quinoidal ion immediately on making solution alkaline. This observation have been made the basis of a simp...

normal 0 false false false en-us x-none ar-sa microsoftinternetexplorer4 background : vitiligo as a common pigmentary disorder affects up to 2% of the general population. there are several treatment modalities in the literature but photo therapy is one of the best known with an improving effect. the goal of this study was to compare the efficacy of nb-uvb alone with adjunction of nb-uvb with ne...