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Search Results: 1 - 10 of 1175 matches for " Shawky Mansour "
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Spatial Modeling of Residential Crowding in Alexandria Governorate, Egypt: A Geographically Weighted Regression (GWR) Technique  [PDF]
Shawky Mansour
Journal of Geographic Information System (JGIS) , 2015, DOI: 10.4236/jgis.2015.74029
Abstract: Despite growing research for residential crowding effects on housing market and public health perspectives, relatively little attention has been paid to explore and model spatial patterns of residential crowding over space. This paper focuses upon analyzing the spatial relationships between residential crowding and socio-demographic variables in Alexandria neighborhoods, Egypt. Global and local geo-statistical techniques were employed within GIS-based platform to identify spatialvariations of residential crowding determinates. The global ordinary least squares (OLS) modelassumes homogeneity of relationships between response variable and explanatory variablesacross the study area. Consequently, it fails to account for heterogeneity of spatial relationships. Local model known as a geographically weighted regression (GWR) was also employed using the sameresponse variable and explanatory variables to capture spatial non-stationary of residentialcrowding. A comparison of the outputs of both models indicated that OLS explained 74 percent ofresidential crowding variations while GWR model explained 79 percent. The GWR improvedstrength of the model and provided a better goodness of fit than OLS. In addition, the findings of this analysis revealed that residential crowding was significantly associated with different structural measures particularly social characteristics of household such as higher education and illiteracy. Similarly, population size of neighborhood and number of dwelling rooms were found to have direct impacts on residential crowding rate. The spatial relationship of these measures distinctly varies over the study area.
Spatial Assessment of Water Quantity Stress in Sultanate of Oman Provinces: A GIS Based Analysis of Water Resources Variability  [PDF]
Talal Al-Awadhi, Shawky Mansour
Journal of Geographic Information System (JGIS) , 2015, DOI: 10.4236/jgis.2015.76045
Abstract: Water quantity planning and management require understanding of spatial variations of water catchment availability. Several environmental indicators are associated with water quantity such as flood occurrence, drought severity, seasonal supply and groundwater stress. Analyzing water stress at national geographic scale is crucial to detect and explore geographic shortage of water resources at national scale. In this study, Geographical Information Systems (GIS) techniques were employed to analyze the spatial variations of water scarcity across Sultanate of Oman provinces. For this main objective, various spatial and attribute datasets were prepared. Many variables were selected based on their importance and correlation with water quantity. GIS overlay function then was used to produce maps for each water indicator. This was followed by employing raster zonal statistics to aggregate the values of each catchment area within each province. The findings of this analysis indicated that significant spatial variation was found among Omani provinces in terms of water quantity stress and its determinants. The most important factors affecting the water quantity stress were drought severity and flood occurrence. Furthermore, physical risk of water quantity was higher in Mascut and Dhofar provinces while it was moderate in Al-Batinah, A’Dakhiliyah and Al-Wusta. Lower risk of water quantity was observed in A’Sharqiyah, Masandam, and A’Dhahriah provinces. Thus, in order to mitigate the impacts of water scarcity on agriculture, cultivation and domestic usages, policy makers in water sector should include spatial strategies for water resource maintain and allocation.
Stylistic Differences across Hedge Funds as Revealed by Historical Monthly Returns  [PDF]
Hany A. Shawky, Achla Marathe
Technology and Investment (TI) , 2010, DOI: 10.4236/ti.2010.11004
Abstract: This paper utilizes two clustering techniques to provide an objective method for classification of hedge funds. A data driven classification framework that utilizes monthly hedge fund returns as inputs, is shown to pro-vide better comparisons among fund categories and can help investors in identifying common factors that can lead to better diversification strategies. Our clustering results indicate that other than the managed fu-tures category, there are only three unique hedge fund styles. These three categories are the Equity Hedge, Fund of Hedge Funds and the Emerging Markets categories. None of the other hedge fund classifications such as Global macro, Distressed Securities, Merger Arbitrage, Convertible Arbitrage appear as a unique and independent category.
One gene, many phenotypes
RM Shawky
Egyptian Journal of Medical Human Genetics , 2009,
Abstract: Phenotype descriptions are valuable information right at the interface of medicine and biology. With the rapid advancement in the fi eld of genetics, thousands of genes involved in human diseases have been cloned. It was expected that knowledge of mutations would lead to consistent genotype-phenotype correlations. The understanding of mechanisms underlying genotype-phenotype discrepancies is important, as it will move clinical genetics towards predictive medicine, allowing better selection of therapeutic strategies and individualized counseling of persons affected with genetic disorders.
Temperature Effects on the Equation of State and Symmetry Energy: A Critique  [PDF]
Hesham Mansour
Open Journal of Microphysics (OJM) , 2018, DOI: 10.4236/ojm.2018.84004
Abstract:
The investigation of strongly interacting systems ranges from matter inside atomic nuclei to matter under extreme conditions in astrophysics. These systems require the introduction of nuclear forces and a systematic many-body approach to solve the strong interaction particles. Understanding the behavior of infinite nuclear matter provides a path to predict the properties of neutron stars and gives insights to astrophysical phenomena. Three-nucleon forces have to be considered when studying nuclear systems, because their impact is necessary to reproduce properties of nuclei and to correctly obtain the neutron drip line. Moreover, they are needed to predict the empirical saturation properties of infinite nuclear matter. The self-consistent Green’s Function approach paves the way for an improved Ab initio analysis of nuclear matter, thereby providing the basis for the equation of state of neutron stars and supernova explosions.
On the Preon Model  [PDF]
Hesham Mansour
Open Journal of Microphysics (OJM) , 2019, DOI: 10.4236/ojm.2019.92002
Abstract:
One of the fundamental questions is that “what the matter is composed of?” In 1897, atoms are known as the basic building blocks of matter. In the year 1911, Ernest Rutherford demonstrated that when alpha particles are scattered on a thin gold foil that the atom is composed of mostly empty space with a dense core at its center which is called the nucleus. Thereafter, protons and neutrons were discovered. In 1956, McAllister and Hofstadter published experimental results of elastic scattering of the electrons from a hydrogen target which revealed that the proton has an internal structure. In 1964, Gell-Mann (and independently) Zweig proposed that nucleons are composed of point-like particles which are called quarks. These quarks are postulated to have spin-1/2, fractional electric charge. Combinations of different flavors of quarks yield protons and neutrons which belong to the type of particles called baryons (built up from three quarks) and mesons as (quark and an antiquark). These two groups of particles are categorized as hadrons. The quarks showed further decay properties which suggested that they have a substructure.
Reconfigurable 3/6 dB Novel Branch Line Coupler  [PDF]
Tamer Gaber Abouelnaga, Ashraf Shawky Mohra
Open Journal of Antennas and Propagation (OJAPr) , 2017, DOI: 10.4236/ojapr.2017.51002
Abstract: In this paper, a new idea of reconfigurable 3/6 dB branch line coupler is proposed. The proposed coupler is tuned through a simple open and short circuit at the coupler’s branches’ edges. At the short edges case, a 3 dB branch line coupler is obtained. In this case, the coupler’s branches are considered as microstrip transmission lines with 0.3 mm slot width which is etched in each coupler’s branch. At the open edges case, the coupler’s branches are considered as asymmetric coupled microstrip lines. In this case, a 6 dB branch line coupler is obtained. Both CST and IE3D simulators are used to optimize the reconfigurable 3/6 dB branch line coupler dimensions. As a prototypes, two BLCs are designed, analyzed and tested at the “on” and “off” states at 2.5 GHz. The measured S-parameters confirm the proposed concept of the reconfigurable 3/6 dB branch line coupler.
C syndrome in an Egyptian infant with dilated brain ventricles and heteroto pia
RM Shawky, DI Sadik
Egyptian Journal of Medical Human Genetics , 2008,
Abstract: C syndrome is an autosomal recessive disorder characterized by trigonocephaly, partial or complete obliteration of the metopic suture which is characteristic, and short limbs. In this paper we describe an Egyptian boy affected with this syndrome, with no exophthalmos and with dilated brain ventricles and heterotopia.
Genetics of obesity
RM Shawky, DI Sadik
Egyptian Journal of Medical Human Genetics , 2012,
Abstract: There is now widespread recognition that the continuing increase in the prevalence of obesity seen in many countries is likely to have major adverse effects on public health. The National Center for Health Statistics reports that 61% of adults in the United States are overweight and 26% are obese. Also The National Health and Nutrition Examination Survey IV, 1999–2002, documents that 16% of children are overweight and 31% are at risk of becoming overweight or are already overweight, representing nearly a 300% increase since the 1960s. The genetic influences are likely to be particularly powerful in people with severe and early-onset obesity, the group is most likely to suffer adverse clinical consequences. In this review we will discuss the Genetics of body weight regulation including genes encoding factors regulating food/energy intake, genes encoding factors implicated in energy expenditure, and genes encoding factors implicated in adipogenesis as well as syndromic forms of obesity.
Frontofacionasal dysplasia: another observation
RM Shawky, DI Sadik
Egyptian Journal of Medical Human Genetics , 2007,
Abstract: Frontofacionasal dysplasia (FFND) is a rare group of disorders, characterized by ocular hypertelorism and frontonasal process anomalies in which clinical and etiological heterogeneity have been recognized since the first review by Gollop 1981.1 Frontofacionasal dysplasia is inherited as an autosomal recessive genetic trait. We report on a 10 month old male whose parents are non consanguineous. The patient has severe craniofacial anomalies characterized by: hypertelorism, unilateral (Right sided) malformed eye, lagophthalmos, irregular Sshaped palpebral fissures, deformed nostrils, hypoplastic nasal wing, cleft lip, cleft palate and meningeocele. This association of anomalies suggests the diagnosis of frontofacionasal dysplasia and in our case is associated with facial heamangioma. To our knowledge, facial heamangioma in association with FFND have not been described before
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