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Search Results: 1 - 10 of 5314 matches for " Mahmoud Hamid Mahmoud Hilo "
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Using of the Generalized Special Relativity in Deriving the Equation of the Gravitational Red-Shift  [PDF]
Mahmoud Hamid Mahmoud Hilo
Journal of Modern Physics (JMP) , 2011, DOI: 10.4236/jmp.2011.25045
Abstract: In this work we present a study of a new method to prove the equation of the gravitational red shift of spec-tral lines. That’s according to the generalized special relativity theory. The equation of the gravitational red shift of spectral lines has been studied in many different works, using different methods depending on the Newtonian mechanics, and other theories. Although attention was drawn to the fact that the well-known ex-pression of the gravitational Red-Shift of spectral lines may be derived with no recourse to the general rela-tivity theory! In this study a unique derivation has been done using the Generalized Special Relativity (GSR) and the same result obtained.
Using of the Generalized Special Relativity (GSR) in estimating the proton (nucleon) mass to explain the mass defect  [PDF]
Mahmoud Hamid Mahmoud Hilo, M. D. Abd Allah, Khalid Mohammed Haroon
Natural Science (NS) , 2011, DOI: 10.4236/ns.2011.32020
Abstract: This paper presents theoretical investigation on explanation of the mass defect estimating a new value for the proton mass inside the nucleus in the presence of the gravitational potential, the work has been done by using a new theory called the generalized special relativity (GSR).
Self-Tuning Control for MIMO Network Systems  [PDF]
Magdi S. Mahmoud, Matasm M. Hassan Hamid
Journal of Signal and Information Processing (JSIP) , 2012, DOI: 10.4236/jsip.2012.32020
Abstract: The advances in MIMO systems and networking technologies introduced a revolution in recent times, especially in wireless and wired multi-cast (multi-point-to-multi-point) transmission field. In this work, the distributed versions of self-tuning proportional integral plus derivative (SPID) controller and self-tuning proportional plus integral (SPI) controller are described. An explicit rate feedback mechanism is used to design a controller for regulating the source rates in wireless and wired multi-cast networks. The control parameters of the SPID and SPI controllers are determined to ensure the stability of the control loop. Simulations are carried out with wireless and wired multi-cast models, to evaluate the performance of the SPID and SPI controllers and the ensuing results show that SPID scheme yields better performance than SPI scheme; however, it requires more computing time and central processing unit (CPU) resources.
Reineckeiidae (Ammonoidae) Family of the Dalichai Formation in Damghan Area (East Alborz), Iran  [PDF]
Marjan Zadesmaeil, Mahmoud Reza Majidifard, Seyed Hamid Vaziri, Davood Jahani
Open Journal of Geology (OJG) , 2017, DOI: 10.4236/ojg.2017.76061
Abstract: The present study is concerning the systematic descriptions of the Middle Jurassic (Callovian) ammonite fauna from the Damghan Area (eastern Alborz) and contains a rather rich ammonite fauna. The described ammonites come from the Middle part of the Dalichai Formation, consisting of an alternation of green marl, grey limestone and marly limestone. In this research, the biostratigraphy of these rocks is discussed with special emphasis on the abundant ammonite fauna (Reineckeiidae family). Altogether, 74 specimens of ammonites belonging to 14 species, 3 genera, 3 sub genera from Reineckeiidae family are described. Palaeobiogeographically the ammonite fauna is closely related to that of the sub-Mediterranean Province of the northwestern Tethys. The ammonites represent four zones, i.e. Rehmannia (Loczyceras) cf. segestena (Anceps Zone), Rehmannia (Loczyceras) reissi (Anceps Zone), Rehmannia (Loczyceras) rehmanni (Anceps Zone), Rehmannia (Loczyceras) sequanica densicostata (Coronatum Zone), Reineckeia (Tyrannites) convexa (Gracilis Zone), Reineckeia (Tyrannites) pictava (Gracilis Zone), Reineckeia (Reineckeia) anceps anceps (Anceps Zone), Reineckeia (Reineckeia) anceps elmii (Anceps Zone), Reineckeia (Reineckeia) cf. fehlmani (Anceps Zone), Reineckeia (Reineckeia) nodosa (Athleta Zone), Collotia cf. multicostat (Anceps Zone), Collotia cf. gaillardi (Coronatum Zone), Collotia cf. oxyptychoides (Athleta Zone), Collotia cf. collotiformis (Athleta Zone).

Utilisation of topical honey in burns wounds contaminated with pseudomonas aeroginosa compared with silversulfadiazine and acetatmafenid
Reza Miri Mahmoud, H Hamid, S Shahram
Nigerian Journal of Surgical Research , 2005,
Abstract: Background: Heat injury with consequent coagulation necrosis of skin layers provides an environment that is suitable for bacterial infection as a result of low tissue perfusion and high protein content. Gram negative bacteria and especially Pseudomonas aeroginosa have been recognized as the main causative organisms of burns wound infection. For long time, mankind has been interested in remedial role honey. The role of honey in deep burns wound remains especially after massive secondary bacteria infection has not been sufficiently if documented. Materials and method: In this study, 60 Indian piggies were categorised into three equal groups. A part of the skin of each piggy approximately 8.5cm2, was burned with steam (third degree burns). The wounds were each subsequently inoculated with 10 8 Pseudomonas aeroginosa. For each group a specific dressing agent was used to cover the wounds (honey, 1% silver sulfadiazine or 8.5%Acetatmafenid).On specific days, according to a formulated schedule, the weight of the animals, the condition and extent of wounds were recorded. Culture specimens were also taken for qualitative and quantitative analysis periodically. Results: Out of the three groups the Honey group had the least contamination in prepared specimens on the tenth day (20% compared with 95% and 100% in the other groups), the smallest remaining wound (percentage dwindle in size) 62%, compared to 29% and 22% in the other groups) and the most formation of granulation tissue (90% compared with 35% and 44% in the other groups) at 10 days. Mortality was also least in the honey group (30% with 40% and 45% in the other two groups). Conclusion:The topical use of honey in deep burn wounds contaminated with pseudomonas aeroginosa is superior to silver sulfadiazine and Acetatmefamid in terms of granulation tissue formation, wound healing and antimicrobial effect.
An Investigation of the Relationship between Unplanned Buying and Post-purchase Regret
Mahmoud Abd El-Hamid Saleh
International Journal of Marketing Studies , 2012, DOI: 10.5539/ijms.v4n4p106
Abstract: The purpose of this study is to investigate the association of unplanned buying with post-purchase regret, moderated by consumer-family income and gender, as well as the association of both sales promotion and bank- card payment with unplanned buying in the Saudi market. Drawing on unplanned buying and post-purchase literature, the study tested a model of post-purchase regret. A survey was conducted among Saudi consumers of retail stores in Riyadh, Saudi Arabia. A convenience sample of 927 respondents was taken for data collection, among them 903 were finalized for analysis. The study concluded that there is a positive relationship between unplanned buying and post-purchase regret. An increased association of unplanned buying with post-purchase regret has been found among low-income earners and male consumers. Furthermore, bank-card payment, but not sales promotion, has a significant association with unplanned buying. Practically, consumers and marketers can benefit from the results and recommendations of this study, both avoiding the bad consequences of post-purchase regret. Self-awareness of the factors that cause regret may turn consumers to be more rational in their future buying decisions. Marketers’ perceptions of those factors may also be helpful in setting marketing strategies towards their target markets; satisfying, and retaining consumers. The original contribution of this study comes from a lack of research in the Middle East on unplanned buying, post-purchase regret and their relationship antecedents.
Radiation Induced Grafting of Viscose Rayon Fabrics with Some Acrylic Acid Derivatives and Styrene  [PDF]
Mahmoud Barakat Foad Ahmed Barakat, Kariman Mohame El-Salmawy, Abdel-Hamid Hussein Zahran
Open Journal of Polymer Chemistry (OJPChem) , 2017, DOI: 10.4236/ojpchem.2017.71001
Radiation induced grafting of viscose rayon fabrics, consisting mainly of cellulose fibers, with some acrylic acid derivatives, namely methyl acrylate, acrylamide and acrylonitrile, and also styrene, has been studied. The resultant graft yields have been determined as a function of the applied different experimental parameters. The impact of the graft yields on the physicochemical properties of viscose rayon fabrics such as swelling, moisture absorption, tensile strength, elongation at break, crease recovery angle and also dyeing ability of the grafted fabrics, has been also studied.
Inhibition of Tomato Yellow Leaf Curl Virus (TYLCV) using whey proteins
Ashraf M Abdelbacki, Soad H Taha, Mahmoud Z Sitohy, Abdelgawad Dawood, Mahmoud Hamid, Adel A Rezk
Virology Journal , 2010, DOI: 10.1186/1743-422x-7-26
Abstract: Tomato yellow leaf curl virus (TYLCV) is one of the major and serious diseases of tomato which causes considerable amount of yield loss in Egypt [1-3]. One hundred twenty five million tons of tomatoes were produced in the world in 2007. China, the largest producer, accounted for about one quarter of the global output, followed by the United States, Turkey, India and Egypt. http://www.fas.usda.gov/htp/2009%20Tomato%20Article.pdf webcite. Losses from plant diseases can have a significant economic impact, causing a reduction in income for crop producers, distributors, and higher prices for consumers.In order to control TYLC-disease, it was found that frequent spray (at 7 days interval) of insecticide, like Cypermethrin (0.01%) or Dimethoate (0.1%) is effective to minimize the disease by controlling its vector whitefly (Bemisia tabaci) [4,5].Researches focused on the use of alternative method to avoid the undesirable effects of the insecticides. In 1940s several investigators suggested the use of milk as spraying or dipping of seedlings for reducing the incidence of virus infections. Recent studies demonstrated the effectiveness of milk in reducing infection of tobacco mosaic virus (TMV) in pepper, tomato, and tobacco [6,7].Whey represents a rich and heterogeneous mixture of secreted proteins with wide ranging nutritional, biological and food functional attributes. The main constituents of whey are α-lactalbumin (ALA), β-lactoglobulin (BLG) and two small globular proteins that account for approximately 70-80% of total whey protein. Historically, whey has been considered a waste product and disposed of in the most cost-effective manner, or processed into relatively low value commodities such as whey powder and various grades of whey protein concentrate/isolate (WPC, WPI). Nowadays, whey proteins and their derivatives are widely used in the food industry due to the excellent functional and nutritive properties adding to the commercial value of the processed foods [8]. The
Fundamentals of Direct Inverse CFD Modeling to Detect Air Pollution Sources in Urban Areas  [PDF]
Mahmoud Bady
Computational Water, Energy, and Environmental Engineering (CWEEE) , 2013, DOI: 10.4236/cweee.2013.22004

This paper presents the fundamentals of direct inverse modeling using CFD simulations to detect air pollution sources in urban areas. Generally, there are four techniques used for detecting pollution sources: the analytical technique, the optimization technique, the probabilistic technique, and the direct technique. The study discusses the potentialities and limits of each technique, where the direct inverse technique is focused. Two examples of applying the direct inverse technique in detecting pollution source are introduced. The difficulties of applying the direct inverse technique are investigated. The study reveals that the direct technique is a promising tool for detecting air pollution source in urban environments. However, more efforts are still needed to overcome the difficulties explained in the study.

Wavelet Density Estimation of Censoring Data and Evaluate of Mean Integral Square Error with Convergence Ratio and Empirical Distribution of Given Estimator  [PDF]
Mahmoud Afshari
Applied Mathematics (AM) , 2014, DOI: 10.4236/am.2014.513200
Abstract: Wavelet has rapid development in the current mathematics new areas. It also has a double meaning of theory and application. In signal and image compression, signal analysis, engineering technology has a wide range of applications. In this paper, we use wavelet method, for estimating the density function for censoring data. We evaluate the mean integrated squared error, convergence ratio of given estimator. Also, we obtain empirical distribution of given estimator and verify the conclusion by two simulation examples.
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