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Search Results: 1 - 10 of 413071 matches for " Hasan M. El Ghanem "
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On the Electrical and Optical Properties of Polycarbonate /MNCl2 Composite  [PDF]
Hasan M. El Ghanem, Subhi A. Saq’an, Mahmoud Al Saadi, Sa’di M. Abdul Jawad
Journal of Modern Physics (JMP) , 2011, DOI: 10.4236/jmp.2011.212189
Abstract: The nature of the MnCl2 salt as a filler to polycarbonate , including their composition, particles dimensions and homogeneity of distribution have been studied using different spectroscopic techniques (XRD, DSC and TGA). A slight increases in the chain-chain separation due to the interaction of the MnCl2 salt with the polycarbonate chains was observed , while a decrease in the optical energy gap (Eopt ) of the polycarbonate polymer with increasing the salt concentration was detected .However employing impedance spectroscopy in the frequency range 10Hz up to 106 Hz. reveals an increase in the dielectric permittivity and conductivity with increasing salt content
Family Boraginaceae in Saudi Arabia
Wafaa K.Taia,Wafaa M. El-Ghanem
Pakistan Journal of Biological Sciences , 2004,
Abstract: Sixty nine Boraginaceous species have been recorded in Saudi Arabia. Twenty nine of them not listed in the Flora of Saudi Arabia. These newly recorded species are mostly inhabit the mountains and the wadies as well as in the areas characterized by the great variations in temperature. The appearance of these species may be due to the rapid change in the ecological factors which leeds to the movement of the vegetation, or due to the uncomplete, previous survey of the flora. This study was pointed the need of more ecological studies to know the reasons of the change in the flora and to study how much the ecological stress may affect the speciation.
Effect of Habitats on Both the Phenotypic Characters and Mineral Contents of Five Wild Species in El-Riyadh City
W.K. Taia,W.M. El-Ghanem
Pakistan Journal of Biological Sciences , 2004,
Abstract: Fourteen taxonomic characters have been studied in five wild species in El-Riyadh city, Salsola baryosma, Zygophyllum migahidii, Francoeuria crispa, Zilla spinosa and Rumex vesicarius, collected from three different habitats throughout three seasons. In the same time mineral contents (P, K, Na, Fe, Cu, Mn and Zn) in these species have been measured during the periods of study. The results of this study revealed that the habitats have insignificant effect on the leaf characters in spite of the slightly effect on the general status, fruiting stage and colour of the plants. Whereas the mineral contents have great variations within the three habitats as well as within the same habitat throughout the different seasons. Analysis of the data revealed that the variations were within the confidence limits. From this study it can be concluded that leaf characters can be used as an effective taxonomic ones, while the chemical composition of the species are greatly affected by both habitats and seasonal variations.
Electrochemical Deposition and Characterization of Poly(3,4-ethylene dioxythiophene), Poly(aniline) and their Copolymer onto Glassy Carbon Electrodes for Potential Use in Ascorbic Acid Oxidation
El-Enany,G.M.; Ghanem,M.A.; El-Ghaffar,M.A. Abd;
Portugaliae Electrochimica Acta , 2010,
Abstract: poly(3,4-ethylene dioxythiophene) (pedot), poly(aniline) (pani) and their copolymer (pedot-pani) were electrodeposited onto a glassy carbon electrode. the electrodeposition was performed using cyclic voltammetry from acidic solution containing appropriate monomer concentrations and sodium dodecyl sulphate (sds) as a wetting agent. the resulting polymer films were characterised using cyclic voltammetry in acidic and neutral phosphate buffer solutions and ir spectroscopy. the specific capacitance of the pedot-pani co-polymer reaches up to 260 f g?1 and had good stability during cycling in mineral acid solution. ir spectroscopy confirms the formation of pedot-pani copolymer. the polymers showed an electrochemical activity towards ascorbic acid oxidation. the oxidation current was linearly dependant up to 20 mm ascorbic acid concentration and the pedot activity was much higher than that for pani and pedot-pani copolymer.
Improving the Performance of Faba Bean and Controlling of Chocolate Spot Disease using Bio-compounds
M.A. El-Metwally,Kh.M. Ghanem,K.M. Abd El-Hai
Plant Pathology Journal , 2010,
Abstract: There is an urgent need to improve faba bean yield since this plant remains an important part of the human diet. So, experiments have been designed to determine the effect of some bio-compounds on faba bean growth, chemical composition and chocolate spot disease. In vitro, results revealed that Bio Zeid and Bio ARC completely inhibited the linear growth, mycelia dry weight and sporulation of Botrytis fabae. Plant oils (cumin, cornation, garlic and rocket oils) completely inhibited the sporulation only. In vivo, results (2007/2008 and 2008/2009 seasons) confirmed the positive return of the tested compounds in which, the highest increase in fresh weight was recorded with Bio ARC, while in dry weight the highest increase was recorded with rocket oil. Plant height, number of branches, pods/plant and seeds/pod increased significantly with Acadian-C plant. The weight of 100 seeds reached to the maximum with aminogreen. In addition to the general improvements in N, P, K, Zn, Fe and Mn content. Total chlorophyll reached to the maximum values when using Bio Zeid, Bio ARC, Acadian-C plant and rocket oil. Bio ARC, Bio Zeid and garlic oil revealed the most superior positive effect among other additions on total phenolic compounds. Bio ARC and Bio Zeid led to maximum reduction of chocolate spot disease severity. Bio-, organic and natural additives were found to be most effective in increasing growth, chemical composition and yield parameters of faba bean and decrease the disease severity of chocolate spot disease.
Electrochemical Deposition and Characterization of Poly(3,4-ethylene dioxythiophene), Poly(aniline) and their Copolymer onto Glassy Carbon Electrodes for Potential Use in Ascorbic Acid Oxidation
G.M. El-Enany,M.A. Ghanem,M.A. Abd El-Ghaffar
Portugaliae Electrochimica Acta , 2010,
Abstract: Poly(3,4-ethylene dioxythiophene) (PEDOT), poly(aniline) (PANI) and their copolymer (PEDOT-PANI) were electrodeposited onto a glassy carbon electrode. The electrodeposition was performed using cyclic voltammetry from acidic solution containing appropriate monomer concentrations and sodium dodecyl sulphate (SDS) as a wetting agent. The resulting polymer films were characterised using cyclic voltammetry in acidic and neutral phosphate buffer solutions and IR spectroscopy. The specific capacitance of the PEDOT-PANI co-polymer reaches up to 260 F g 1 and had good stability during cycling in mineral acid solution. IR spectroscopy confirms the formation of PEDOT-PANI copolymer. The polymers showed an electrochemical activity towards ascorbic acid oxidation. The oxidation current was linearly dependant up to 20 mM ascorbic acid concentration and the PEDOT activity was much higher than that for PANI and PEDOT-PANI copolymer.
Parkinson's Disease: Is It a Toxic Syndrome?
Seham A. Gad ELhak,Abdel Aziz A. Ghanem,Hassan AbdelGhaffar,Sahar El Dakroury,Mohamed M. Salama
Neurology Research International , 2010, DOI: 10.1155/2010/103094
Abstract: Parkinson's disease (PD) is one of the neurodegenerative diseases which we can by certainty identify its pathology, however, this confidence disappeares when talking about the cause. A long history of trials, suggestions, and theories tried linking PD to a specific causation. In this paper, a new suggestion is trying to find its way, could it be toxicology? Can we—in the future—look to PD as an occupational disease, in fact, many clues point to the possible toxic responsibility—either total or partial—in causing this disease. Searching for possible toxic causes for PD would help in designing perfect toxic models in animals. 1. Introduction The term “Parkinson’s disease” refers to a neurodegenerative disease that affects several regions of the brain, including the pigmented nuclei in midbrain and brainstem, the olfactory tubercle, the cerebral cortex, and elements of the peripheral nervous system [1]. 2. Historical Background Parkinson’s disease was first described in a medical context in 1817 by James Parkinson, a general practitioner in London in his Essay on the Shaking Palsy [2]. Even earlier many physicians have picked up some of the features of Parkinson's disease and described them in their writings, for example, Franciscus de le B?e (1614–1672) who described tremors and Fran?ois Boissier de Sauvages de la Croix (1706–1767) who described patients with “running disturbances of the limbs.” Wilhelm von Humboldt (1767–1835), the celebrated academic reformer and writer who lived in the era of Parkinson, has described his own neurological condition in a series of letters [3]. 2.1. PD Is a Significant Clinical Problem PD represents a major clinical problem. Reviewing the multiple clinical findings in PD will show us the need of more researches to reach a possible curative therapy [4]. A group of neurobehavioral abnormalities can be found in PD such as apathy, fearfulness, anxiety, emotional liability, social withdrawal, increasing dependency, depression, dementia, bradyphrenia, a type of anomia termed the “tip-of-the-tongue phenomenon,” visual-spatial impairment, sleep disturbance, psychosis, and other psychiatric problems [5]. The variable presentations of PD often cause diagnostic confusion and a delay in treatment. In the early stages, Parkinsonian symptoms are often mistaken for simple arthritis or bursitis, depression, normal aging, Alzheimer’s disease, or stroke. Gonera et al. [6] characterized a prodromal phase 4–6 years before the main manifestation in PD patients. During this period, PD patients, compared with normal controls, had a higher
Various Approaches for Enhancing the Performance of Wireless Sensor Networks
Hasan Al Shalabi,Ibrahiem M. M. El Emary
International Journal of Computer Science Issues , 2013,
Abstract: In the current time and next decades, Wireless Sensor Networks (WSNs) represents a new category of ad hoc networks consisting of small nodes with three functions: sensing, computation, and wireless communications capabilities. Many routing, power management, and data dissemination protocols have been designed for WSNs where energy awareness is an essential design issue to improve the overall performance of WSN. There are many approaches and techniques explored for the optimization of energy usage in wireless sensor networks. Routing represents one of these areas in which attempts for efficient utilization of energy have been made. In this paper, we report on the current state of the research on optimizing the performance of WSN using various advanced approaches. There are various directions to enhance and optimize the performance as: avoiding congestion and keep it within certain controlled value, selecting the optimum routing approach, reducing the level of power consumption to increase the life time of the sensor node and others. So, the major objective of this paper is to investigate the various techniques used in improving and enhancing the performance of WSN to let it be more reliable in various applications like: health care and biomedical treatment, environment monitoring, military survival lance , target tracking, greenhouse monitoring, etc .
The Influence of Welding Parameters on Brittle Fracture of Liquefied Natural Gas Storage Tank Welded Joint  [PDF]
Abd El Fattah Mustafa Khourshid, Mohamed Ahmed Ghanem
Materials Sciences and Applications (MSA) , 2013, DOI: 10.4236/msa.2013.43024
Abstract:

Many applications operate at sufficiently low temperature conditions where most structural steels become very brittle and, therefore, unsuitable for use in safety-critical structures. So the materials used in the vessels or storage tanks which keep the natural gas at liquefaction temperatures need to remain ductile and crack resistant with a high level of safety. The material also needs to have high strength in order to reduce the wall thickness of the container and it must permit welding without any risk of brittle fracture. 9% Ni steel plates are one of most common used materials in the LNG storage tank application. However, the welding procedure for 9% Ni steel plates requires high level of skills of welding that is strictly controlled welding parameter for balancing avoidance of cold and hot cracking and maintenance of high strength. Mechanical properties are important characteristics of the weldment that must confirm to the application feasibility as well as functional requirements of the welded joint. The only way to enhanced the mechanical properties of welded joint by controlling the parameters of using welding process. From the main variables of the arc welding process are the heat input and interpass temperature where the two variables control the thermal cycle of welding process. The experiment show that for thin test specimen with thickness ≤ 14 mm, the heat input range from 1.4 to 2 KJ/mm and controlling interpass temperature within 80°C give high tensile strength with improving the toughness properties of welded joint and reduce the probability of brittle fracture happened by increase the ductility and reduce the yield strength and increased the transition temperature.

Analysis of four DLX homeobox genes in autistic probands
Steven P Hamilton, Jonathan M Woo, Elaine J Carlson, N?el Ghanem, Marc Ekker, John LR Rubenstein
BMC Genetics , 2005, DOI: 10.1186/1471-2156-6-52
Abstract: Sequencing of exons, exon/intron boundaries and known enhancers of DLX1, 2, 5 and 6 identified several nonsynonymous variants in DLX2 and DLX5 and a variant in a DLX5/6intragenic enhancer. The nonsynonymous variants were detected in 4 of 95 families from which samples were sequenced. Two of these four SNPs were not observed in 378 undiagnosed samples from North American populations, while the remaining 2 were seen in one sample each.Segregation of these variants in pedigrees did not generally support a contribution to autism susceptibility by these genes, although functional analyses may provide insight into the biological understanding of these important proteins.Autism is a severe heterogeneous neurobehavioral syndrome that becomes apparent in the first years of life [1-3] Autism is often viewed as a type of mental retardation, as most autistics have IQs lower than 70. However, autism is distinguished from other mental retardation syndromes by disproportionately severe deficits in language and social skills. Persons with some autistic features but with preserved language are often referred to as having Asperger's Syndrome [4].There has been much interest and work investigating the genetic basis of autism [5]. Twin studies have shown that autism is a strongly inherited disorder [2,6,7], as monozygotic twins are concordant for this syndrome substantially more frequently than are dizygotic twins. For reasons that are not yet understood, autism affects boys about four times more often than girls. Non-genetic etiological factors are under careful consideration [8], given the controversy over changing estimates of the incidence of autism over the past decades [9].Recently, we hypothesized that some forms of autism may be due to a disproportionate high level of excitation (or disproportionately weak inhibition) in neural circuits that mediate language and social behaviors [10]; related models have also been postulated [11,12]. A "noisy" (hyperexcitable, poorly functional
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