Wave-Packet Scattering off the Kink-Solution

We investigate the propagation of a wave--packet in the $\phi^4$ model. We solve the time-dependent equation of motion for two distinct initial conditions: The wave-packet in a trivial vacuum background and in the background of the kink soliton solution. We extract the scattering matrix from the wave-packet in the kink background at very late times and compare it with the result from static potential scattering in the small amplitude approximation. We vary the size of the initial wave-packet to identify non-linear effects as, for example, the replacement of the center of the kink.Comment: 15 pages, 7 figures (from 14 eps files), 4 tables, Int. J. Mod. Phys. A, in prin

Groundwater studies in arid areas in Egypt using LANDSAT satellite images

Various features are interpreted which have strong bearing on groundwater in the arid environment. These include the nature of geological and lithologic units, structural lineaments, present and old drainage systems, distribution and form of water pools, geomorphologic units, weathering surfaces and other weathering phenomena, desert soils, sand dunes and dune sand accumulations, growths of natural vegetation and agriculture, and salt crusts and other expressions of salinization. There are many impressive examples which illustrate the significance of satellite image interpretation on the regional conditions of groundwater which could be traced and interconnected over several tens or even several hundreds of kilometers. This is especially true in the northern Western Desert of Egypt where ground water issuing from deep strata comes to the surface along ENE-WSW and ESE-WNW fault lines and fracture systems. Another striking example is illustrated by the occurrence of fresh to brackish groundwater on the Mediterranean Sea Coastal Zone of the Western Desert where the groundwater is found in the form of lenses floating on the saline sea water

Application of LANDSAT satellite imagery for iron ore prospecting in the Western Desert of Egypt

Prospecting for iron ore occurrences was conducted by the Remote Sensing Center in Bahariya Oasis-El Faiyum area covering some 100,000 km squared in the Western Desert of Egypt. LANDSAT-1 satellite images were utilized as the main tool in the regional prospecting of the iron ores. The delineation of the geological units and geological structure through the interpretation of the images corroborated by field observations and structural analysis led to the discovery of new iron ore occurrences in the area of investigation

Citizenship Education and Liberal Democratic Change: The Egyptian Case

This paper explores citizenship education in Egypt in the context of its current experience in liberal democratic change, especially after the amendment of Egypt\u27s constitution, in March 2007, to include the principle of citizenship in its first article. The paper begins with exploring the meaning of citizenship, the relationship between citizenship and liberal democratic change and the emergence of citizenship education in traditional western democracies. Then it describes the Egyptian case in citizenship education with reference to its modern historical background. Finally it analyzes the effects of political, economic, and social circumstances in Egypt on citizenship education. The study shows that there is awareness of the importance of preparing good citizens for a new democratic society in Egypt; but citizenship education is still marginalized. Cet article explore l’enseignement de la citoyenneté en Egypte lors du changement démocratique libéral survenu après l’amendement de la Constitution égyptienne en mars 2007 qui a inclus les principes de la citoyenneté dans son premier article. Cet article commence tout d’abord par explorer ce que citoyenneté veut dire. Il cherche ensuite à analyser la relation qui existe entre citoyenneté et changement démocratique libéral et enfin à examiner l’émergence de l’enseignement dans les démocraties occidentales traditionnelles. Il décrit par la suite le cas de l’enseignement de la citoyenneté en Egypte tout en se basant sur ses origines historiques modernes. Il analyse enfin l’influence des circonstances politiques, économiques et sociales égyptiennes sur l’éducation de la citoyenneté. Cette étude démontre l’existence d’une réelle conscience quant à l’importance de préparer de bons citoyens pour l’avenir de la nouvelle société égyptienne, bien que cette éducation soit encore très marginalisée

Modernization of Education in Egypt: The Liberal Movement Towards Dewey’s Ideas

This paper traces, from a historical perspective, the acceptance of the educational ideas of John Dewey (1859-1952) in Egypt in context of its earlier and ongoing efforts to modernize the education system. It first discusses the different political, educational, and social factors that might have facilitated the acceptance of Dewey‘s educational ideas in Egypt. Then it discusses the ways through which Dewey‘s educational ideas reached into Egypt, including establishment of European and American schools in Egypt, sending educational missions to Europe and the USA, and translation of works of western intellectuals into Arabic. It also discusses the adoption of Dewey‘s ideas by many Egyptian educationists. The study focuses on Al-Qabbani (1898-1963), the progressive thinker and Minister of Education in Egypt, and shows the extent to which his educational ideas agreed with Dewey‘s educational philosophy. Finally, the study explores the application of some of Dewey‘s progressive educational ideas in Egypt. Cet article retrace, de par le biais d‘une analyse historique, l‘acceptation des idées éducatives de John Dewey (1859-1952) en Égypte dans le but de moderniser l‘intégralité du système éducatif du pays. Il discute tout d‘abord les différents facteurs politiques, éducatifs et sociaux qui peuvent avoir facilités l‘acceptation de ces idées éducatives en Égypte. Il se concentre ensuite sur les différents chemins au travers desquels les idées de Dewey se sont insérées dans le contexte égyptien, tel que la création d‘écoles européennes et américaines, l‘envoi de missions éducatives en Europe et aux États- Unis et la traduction d‘écrits d‘auteurs occidentaux en langue arabe. L‘article discute également de l‘adoption des idées de Dewey de la part de beaucoup d‘éducateurs égyptiens. Il se concentre surtout sur l‘intellectuel progressiste et Ministre d‘Éducation Égyptien Al-Qabbani (1898-1963) et montre ses liens étroits avec la philosophie éducative de Dewey. En conclusion, cet écrit explore la mise en pratique de quelques unes des idées éducatives progressistes de Dewey dans le contexte égyptien

TWO NOVEL FLAVONE C-GLYCOSIDES ISOLATED FROM AFROCARPUS GRACILIOR: POM ANALYSES AND IN VITRO CYTOTOXIC ACTIVITY AGANIST HEPATOCELLULAR CARCINOMA

Objective: Cancer is considered as one of the top reasons of death and the number of cases increasing gradually. Cancer is severe clinical difficulty to the health caution system. This study explored two novel polyphenols of Afrocarpus gracilior Pilger growing in Egypt and evaluated their cytotoxic activity. Methods: Methanolic (80%) extract of the leaves of A. gracilior was subjected to column chromatography; the chemical structures of the isolated compounds were established by advanced spectral techniques: UV, 1H, 13C NMR, two dimensional NMR (2D NMR) and electron spray ionization mass spectroscopy (ESI-MS). Compounds 1 and 2 were studied for their cytotoxic activity against hepatocellular carcinoma (Hep-G2) using sulforhodamine B (SRB) assay. Furthermore the pharmacokinetics profiles of these molecules were accessed by employing Petra/Osiris/Molinspiration (POM) analyses. Results: Two novel C-flavonoid glycosides were isolated [1: Apigenin 8-C-β-D-glucopyranosyl-(1```→4``)-O-β-D-glucopyranoside] and [2: 7-O methyl-luteolin 8-C-β-glucopyranosyl-(1```→4``)-O-β-D-glucopyranoside]. They exhibited significant cytotoxic activity (IC50 = 9.02 and 15.61 µg/ml, respectively) against Hep-G2 cells. The POM analyses revealed that the activity of these two compounds depends on the presence of glucosyl and alkyl groups at the internal and terminal atmosphere of the compounds. Conclusion: These findings demonstrated that the leaves of A. gracilior contain a series of bioactive polyphenolic compounds with significant cytotoxic properties against hepatocellular carcinoma and may be used as alternative anticancer agents for doxorubicin. On the basis of POM calculations, it will be interesting to develop some alternative flavones because the deglucosylated derivatives have a better drug score than parent molecules. This preliminary study will be extended to other strains of cancer

Interaction of CO molecules with (Cu , Ag and Au) deposited on regular and defective MgO and BaO(001) surfaces: Density functional calculations

The adsorption properties and characteristics of CO on Cu, Ag and Au atoms deposited on various sites of the alkaline earth oxide MgO and BaO. The three members of morphological irregularities, terrace, edge, and oxygen terminated corner of MgO and BaO (001) surface have been studied by means of density functional calculations and embedded cluster model. The examined clusters were embedded in the simulated Coulomb fields that closely approximate the Madelung fields of the host surfaces. The  adsorption  properties  of  CO  have  been  analyzed  with reference  to  the  nature  of  the  oxide  support,  pairwise  and  non-pairwise  ..........Please read the full paper