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Search Results: 1 - 10 of 639 matches for " Alaa Esmaeil Eldwer "
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Comparison of Stochastic Models in Forecasting Monthly Streamflow in Rivers: A Case Study of River Nile and Its Tributaries  [PDF]
Mohammed A. Elganiny, Alaa Esmaeil Eldwer
Journal of Water Resource and Protection (JWARP) , 2016, DOI: 10.4236/jwarp.2016.82012
Abstract: The dynamic and accurate forecasting of monthly streamflow processes of a river are important in the management of extreme events such as floods and drought, optimal design of water storage structures and drainage network. Many Rivers are selected in this study: White Nile, Blue Nile, Atbara River and main Nile. This paper aims to recommend the best linear stochastic model in forecasting monthly streamflow in rivers. Two commonly hydrologic models: the deseasonalized autoregressive moving average (DARMA) models and seasonal autoregressive integrated moving average (SARIMA) models are selected for modeling monthly streamflow in all Rivers in the study area. Two different types of monthly streamflow data (deseasonalized data and differenced data) were used to develop time series model using previous flow conditions as predictors. The one month ahead forecasting performances of all models for predicted period were compared. The comparison of model forecasting performance was conducted based upon graphical and numerical criteria. The result indicates that deasonalized autoregressive moving average (DARMA) models perform better than seasonal autoregressive integrated moving average (SARIMA) models for monthly streamflow in Rivers.
Study of the Efficacy of Triple Therapy of Sofosbuvir, Pegylated INFalpha 2a and Ribavirin in Treatment of Chronic Hepatitis C Patients Genotype 4 with High Fibrosis  [PDF]
Alaa Aboud
Open Journal of Gastroenterology (OJGas) , 2017, DOI: 10.4236/ojgas.2017.71002
Abstract: Purpose: The aim is evaluation of the efficacy of triple therapy of sofosbuvir, pegylated INFalpha 2a and ribavirin in treatment of chronic hepatitis C (CHC) patients genotype 4 who have high fibrosis. Materials and Methods: Fifty HCV patients with high fibrosis (F3 & F4) were included in the study. Results: SVR rate was 54%; non-responders rate was 12% and relapsers rate was 34%. When comparing SVR between F3 group patients and F4 group, it was 88% and 66% respectively, which means that SVR was higher in the F3 group. Conclusion: Triple therapy including pegylated INFalpha 2a is not an ideal therapy in treatment of CHC patients genotype 4 with cirrhosis because of low sustained virological response rates and high incidence of side effects.
Synthesis, Characterization, and Biological Activity of -Methyl-2-(-1,2,3-Benzotriazol-1-y1)-3-Oxobutan-ethioamide Complexes with Some Divalent Metal (II) Ions
Nouria A. Al-Awadi,Nadia M. Shuaib,Alaa Abbas,Ahmed A. El-Sherif,Ali El-Dissouky,Esmaeil Al-Saleh
Bioinorganic Chemistry and Applications , 2008, DOI: 10.1155/2008/479897
Abstract: A new series of Zn2
Virtual water: an effective mechanism for integrated water resources management  [PDF]
Alaa El-Sadek
Agricultural Sciences (AS) , 2011, DOI: 10.4236/as.2011.23033
Abstract: In regions, which suffer from water shortage or potential water shortage like the Middle East, water policies and different mitigation measures are formulated. With the increasing population and increasing demand for food and drinking water with the fixed supply of water, the demand management policies have been introduced. Virtual Water has been adopted as an alternative or potential alternative water resource. In the application of the Integrated Water Resources Management (IWRM), virtual water has to be considered as a resource of water. In this paper, the practical value of the virtual water concept as well as the possibility of the application of the concept in the regional and national level are discussed. The paper emphasizes on the application of virtual water in agriculture products and virtual water trade of these products. This research concluded that, there is a possibility for the application of the virtual water concept on the national level taking into account water endowments, and other natural and social economic conditions. The virtual water strategy seeks ways to consciously and efficiently utilize the internal and external water resources to alleviate water scarcity. This, however, by no means implies that importing food is the only response the water scarce countries and regions should and can take. Other measures concerning the supply and demand sides of water management are imperative. The argument here is that the virtual water strategy should be an integral component in the whole package of integrated water resources management.
Spin-Orbit Electronic Structure of the ScBr Molecule  [PDF]
Alaa Hamdan, Mahmoud Korek
Journal of Modern Physics (JMP) , 2011, DOI: 10.4236/jmp.2011.210146
Abstract: A theoretical investigation of the spin-orbit electronic states of the molecule ScBr has been performed via CASSCF and MRCI (single and double excitations with Davidson correction) calculations. Spin-orbit effects have been introduced through semi-empirical spin orbit pseudo-potential for scandium while they have been neglected for bromine. Potential energy curves for 42 electronic states in the representation Ω(±) have been determined along with the corresponding spectroscopic constants. The comparison of the present results with those available in the literature shows a good agreement. New results have been investigated in present work for 30 electronic states in the representation Ω(±) for the first time.
Biomarkers in Nile Tilapia Oreochromis niloticus niloticus (Linnaeus, 1758) to Assess the Impacts of River Nile Pollution: Bioaccumulation, Biochemical and Tissues Biomarkers  [PDF]
Alaa G. M. Osman
Journal of Environmental Protection (JEP) , 2012, DOI: 10.4236/jep.2012.328112
Abstract: The use of biomarkers has become an important tool for modern environmental assessment as they can help to predict pollutants involved in the monitoring program. Here I present data on bioaccumulation, biochemical and tissues biomarkers in Nile tilapia as early warning indicators of river Nile pollution. Nile tilapia sampled from downstream sites accumulated higher levels of all the detected heavy metals than those collected from upstream sites. Heavy metal residues in the tissues of Nile tilapia exhibited different patterns of accumulation and distribution among the selected tissues. Remarkable alterations in the activities of glucose-6-phosphate dehydrogenase (G6PDH) and lactate dehydrogenase (LDH) in the tissues of Nile tilapia were detected. These alterations were followed, in the present study, by the occurrence of histological lesions in liver and gill tissues of fish collected from the same sites. Alterations in bioaccumulation patterns, in enzyme activities and in histology go in parallel with the elevation in the levels of water chemical parameters detected in the downstream sites as a result of pollution stress in these areas. These results provide evidence that bioaccumulation, biochemical and tissues biomarkers can be sensitive indicators of exposure to mixed pollutants in surface waters.
Evolutionary Approach to Forex Expert Advisor Generation  [PDF]
Alaa Eldin M. Ibrahim
Intelligent Information Management (IIM) , 2014, DOI: 10.4236/iim.2014.63014
Abstract:

We have developed a genetic algorithm approach for automatically generating expert advisors, computer programs that trade automatically in the financial markets. Our system, known as GenFx or Genetic Forex, evaluates evolutionarily generated expert advisors strategies using predetermined fitness functions to automatically prioritize parents for breeding. GenFx simulates several key factors in natural selection. It employs a multiple generation breeding population, a notion of gender, and the concept of aging to maintain diversity while providing many breeding opportunities to highly successful offspring. The approach is also especially efficient running in a multiple processor, multiple selection-strategy mode using multiple settings. We found out that a multi-processor gender-based running of the system outperformed all single runs of the system. This system is inspired by GenShade, a previous system that we have developed for evolutionary generating procedural textures. The methods described in this paper are not limited to the Forex market or financial problems only but are applicable to many other fields.

Genotoxicity Tests and Their Contributions in Aquatic Environmental Research  [PDF]
Alaa G. M. Osman
Journal of Environmental Protection (JEP) , 2014, DOI: 10.4236/jep.2014.514132
Abstract:

As many chemicals with genotoxic potential are emitted to surface water, genotoxicity tests are gaining importance which led to the development of several techniques to detect directly DNA damage. The relevance of detecting the genotoxic risks associated with water pollution was firstly perceived in the late 1970s. Since that time several tests have been developed for evaluating DNA alterations in aquatic animals. These tests rely on the premise that any changes to DNA may have long-lasting and profound consequences. Sister chromatid test, chromosome aberrations, comet assay, and micronucleus test are currently the most widely employed methods to detect DNA lesions in ecotoxicology. Chromosomal aberration and sister chromatid exchanges are time consuming, resource intensive and require proliferating cell population. Hence, Comet assay and Micronucleus test as cost effective and more sensitive test systems have now been introduced for assessing the genotoxicity of chemicals. This review presents a synthesis of the state of the art in the methodologies of comet assay and micronucleus test and their contributions in aquatic environmental research. The text explores the latest knowledge and thinking on these very important approaches for the assessment of environmental health, management, and conservation. The primary concern of the present review is the measurement of genotoxic potential in aquatic organisms under field and laboratory conditions, where effects of chemicals at different levels of biological organization can be examined.

Capacity Utilisation and Unemployment in Selected West Africa Countries  [PDF]
Alaa M. Soliman
Theoretical Economics Letters (TEL) , 2017, DOI: 10.4236/tel.2017.76117
Abstract: The purpose of this research paper is to examine the proposition that capacity utilisation is an important factor in the determination of unemployment and wages. Underlying this proposition is the notion that capacity utilisation helps to determine the future path of the economy and is a significant factor in the response of the economy to different supply and demand shocks. We derived capacity utilisation and unemployment relationships, which were estimated and tested using data covering from 1997 to 2016 for three West Africa countries. The results suggest that long-term unemployment and capacity utilisation have a significant impact on unemployment. The policy implications of our findings are that in view of the strong effect of capacity utilisation on unemployment, programmes that enhance efficiency in production and investment enhancing policies may allow unemployed to regain access to the labour market.
Weakly symmetry of a class of g-natural metrics on tangent bundles
Esmaeil Peyghan
Mathematics , 2014,
Abstract: Considering the class G of g-natural metrics on the tangent bundle of a Riemannian manifold (M, g), it is shown that the flatnees for g is a necessary and sufficient condition of weakly symmetry (recurrent or pseudo-symmetry) of G. In particular, the cases of weakly symmetric Sasakian lift metric studied by Bejan and Crasmareanu and recurrent or pseudo-symmetric Sasakian lift metric studied by Binh and Tamassy are obtained.
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