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Search Results: 1 - 10 of 630 matches for " Nabil Bassim "
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An Online Productivity Measuring and Analyzing System: Proof-of-Concept  [PDF]
Bassim Shebeb
American Journal of Industrial and Business Management (AJIBM) , 2018, DOI: 10.4236/ajibm.2018.88126
Abstract: The principle aim of this applied research is to design and build up an Online Productivity Measuring and Analyzing System (OPMAS): Proof-of-Concept1 to measure and analyze the economic growth and its major sources; the multifactor productivity and factor-intensity at the firm, sub-industry (ISC 2-digit), and industry levels. Special features of this applied research are the instantaneous productivity measuring and analyzing. In addition, it is developing an educational and training HUB for productivity awareness and improvements for both researchers and organizations. Thus, the HUB comes with a prompt measuring tools/models (OPMAS) of the economic performance; the multifactor productivity and singly-factor productivity growth of a firm using its one-year loss/profit statement or/and time series data. Besides to the hub’s prompt measuring of productivity, the firm will also be provided with an instant-reporting about its economic performance in-compression to its related industry at two different levels (2-digit and i-digit ISC). For example, a firm operating within Food and Beverages manufacturing industry, it will be compared with the performances of the Food and Beverages manufacturing industry 2-digit ISC and with the performance of the overall Manufacturing Industry, D-ISC. Furthermore, a simulation model (Productivity Analytics) for investigating the impact of various policies on the firm’s economic performance could be proposed. The policies which they could be analyzed including environmental regulations, import and export taxes, and the provision of infrastructure.
Perfect interference-less absorption at infrared frequencies by a van der Waal's crystal
D. G. Baranov,J. H. Edgar,Tim Hoffman,Nabil Bassim,Joshua D. Caldwell
Physics , 2015, DOI: 10.1103/PhysRevB.92.201405
Abstract: Traditionally, efforts to achieve perfect absorption have required the use of complicated metamaterial-based structures as well as relying on destructive interference to eliminate back reflections. Here, we have demonstrated both theoretically and experimentally that such perfect absorption can be achieved using a naturally occurring material, hexagonal boron nitride (hBN) due to its high optical anisotropy without the requirement of interference effects to absorb the incident field. This effect was observed for p-polarized light within the mid-infrared spectral range, and we provide the full theory describing the origin of the perfect absorption as well as the methodology for achieving this effect with other materials. Furthermore, while this is reported for the uniaxial crystal hBN, this is equally applicable to biaxial crystals and more complicated crystal structures. Interference-less absorption is of fundamental interest to the field of optics; moreover, such materials may provide additional layers of flexibility in the design of frequency selective surfaces, absorbing coatings and sensing devices operating in the infrared.
Improving Rule Base Quality to Enhance Production Systems Performance  [PDF]
Nabil Arman
International Journal of Intelligence Science (IJIS) , 2013, DOI: 10.4236/ijis.2013.31001
Abstract: Production systems have a special value since they are used in state-space searching algorithms and expert systems in addition to their use as a model for problem solving in artificial intelligence. Therefore, it is of high importance to consider different techniques to improve their performance. In this research, rule base is the component of the production system that we aim to focus on. This work therefore seeks to investigate this component and its relationship with other components and demonstrate how the improvement of its quality has a great impact on the performance of the production system as a whole. In this paper, the improvement of rule base quality is accomplished in two steps. The first step involves re-writing the rules having conjunctions of literals and producing a new set of equivalent rules in which long inference chains can be obtained easily. The second step involves augmenting the rule base with inference short-cut rules devised from the long inference chains. These inference short-cut rules have a great impact on the performance of the production system. Finally, simulations are performed on randomly generated rule bases with different sizes and goals to be proved. The simulations demonstrate that the suggested enhancements are very beneficial in improving the performance of production systems.
Validity of Upper Gastro-Intestinal Endoscopic Screening in HCV Cirrhotic Patients Awaiting Antiviral Therapy  [PDF]
Salem Y. Mohamed, Bassim A. Gaballah, Mohamed H. Emara
Open Journal of Gastroenterology (OJGas) , 2015, DOI: 10.4236/ojgas.2015.512029
Abstract: Background and Aim: The Egyptian Ministry of Health initiated a nationwide HCV treatment program with the newly developed oral antiviral therapies and formulated national guidelines for treatment allocation which gave favor for patients with advanced fibrosis and early cirrhosis. One of the recommendations for treatment was upper Gastro-intestinal (GIT) endoscopy. This study aimed at estimating the prevalence of varices among those patients and judging the validity of this national recommendation. Methods: This study was carried out at gastrointestinal endoscopy units, Zagazig University Hospitals through the year 2014. The epidemiologic, clinical features and endoscopic findings of patients undergoing preparation for HCV therapy were analyzed. Endoscopic classifications of esophageal and gastric varices were carried out after the Italian liver cirrhosis project and Sarin’s classification respectively. Results: Totally 1143 patients performed upper GIT endoscopy as preparation for HCV treatment. This comprised 22% of all patients undergoing upper GIT endoscopy over that year. There was a fourfold rise in percentage of patients undergoing endoscopy for sofosbuvir-based therapy in this year (22%) when compared to assessment for Interferon/Ribavirin combination therapy (5%) in the previous year. A total of 361 patients had no esophageal or gastric varices. Small sized (grade I), medium sized (grade II) and large sized (grade III) varices were reported in 301, 188 and 293 patients respectively. Thirty patients (2.6%) had gastric varices. The prevalence of varices was higher in Child B in comparison to Child A (statistically not significant, p = 0.243). Conclusion: Screening endoscopy for early cirrhotic patients awaiting oral anti-HCV therapy is valid.
Product Ethnicity between the Hammer of Identity and the Anvil of Globalization  [PDF]
Jeddi Nabil, Zaiem Imed
American Journal of Industrial and Business Management (AJIBM) , 2013, DOI: 10.4236/ajibm.2013.31011

With the globalization of markets, the multinational production made obvious great strides marked by the proliferation of hybrid or bi-national products. In this context which supported the dissolution of identity of several products’ categories and called in question the weight of origin labels about the consumer behavior purchase. Beyond these reflections, this article proposed to wonder about the relation between globalization and product ethnicity, by analyzing the apparent effects of the current context of globalization on the establishment of stereotypic country-products associations by the consumers. Also, the question which is directed to the development and the presentation of this research is the following one: to what extend does the current context of globalization enable us to call in question the phenomenon of product ethnicity?

On Slide Mode Control of Chaotic Rikitake Two-Disk Dynamo—Chaotic Simulations of the Reversals of the Earth’s Magnetic Field  [PDF]
Ahmad Harb, Nabil Ayoub
International Journal of Modern Nonlinear Theory and Application (IJMNTA) , 2014, DOI: 10.4236/ijmnta.2014.33015

The modern nonlinear theory, bifurcation and chaos theory are used in this paper to analyze the dynamics of the Rikitake two-disk dynamo system. The mathematical model of the Rikitake system consists of three nonlinear differential equations, which found to be the same as the mathematical model of the well-known Lorenz system. The study showed that under certain value of control parameter, the system experiences a chaotic behaviour. The experienced chaotic oscillation may simulate the reversal of the Earth’s magnetic field. The main objective of this paper is to control the chaotic behaviour in Rikitake system. So, a nonlinear controller based on the slide mode control theory is designed. The study showed that the designed controller was so effective in controlling the unstable chaotic oscillations.

A Model for FeSiMg Alloy Production by Reduction Technique  [PDF]
Saeed Nabil Saeed Ghali
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2011, DOI: 10.4236/jmmce.2011.109067
Abstract: Ferrosilicon magnesium is basic foundry alloys used for the production of ductile cast iron. Magnesium content plays an important role in the produced alloy grades from dolomite ore. The focus of the present work is to simulate mathematical model to predict magnesium content in the ferrosilicon magnesium, which produced by silicothermic reduction of calcined dolomite. The basic assumptions of this model are: constant low viscosity of molten charge, the reaction is irreversible of second order and the reaction is isothermal. The reaction is based on the following equation: 2MgO+2Si →Mg2Si+SiO2 The results of previous work was found to be in a good coincidence with the predicted values by the model [Mg]=(MgO0)[Si0][eKt[(MgO0)-[Si0]]-1]/ (MgO0)[eKt[(MgO0)-[Si0]]-[Si0]] where [Mg] is the concentration of magnesium metal in ferrosilicon magnesium alloy in mol/L. [Si0] and (MgO0) are the initial concentration of silicon and magnesium oxide in charge in mol/L, while t is time in second, K is the reaction rate constant ( 3.26588x10-7 L Sec-1 mol-1). The predicted values are greater than the experimental values; this may be attributed to the use of concentration instead of the activity. The predicted values of magnesium content in ferrosilicon magnesium alloy are in a good agreement with the experimental results obtained in previous work at low viscosity.
Mechanisms of the Deterioration of the Wall Reliefs at Shenhur Temple, Upper Egypt and Concepts for Conservation  [PDF]
Nabil A. Bader
Open Journal of Geology (OJG) , 2015, DOI: 10.4236/ojg.2015.511071
Abstract: The Roman Period temple of Isis at Shenhur was built and enhanced amid the rule of Augustus (30 BCE-14 CE) through that of Trajan (98-117 CE). It was built of two sorts of local limestone and decorated with reliefs. Examination of conservation state uncovered that it was collapsed and only partly preserved and it disposed of some still buried rooms. The temple is exposed to different deteriorations processes created by internal and external stresses because of the mineral composition of the building materials, atmosphere variables, salts crystallization and groundwater. In this study, the deterioration problems of the wall reliefs were examined for the aim of its conservation. For this purpose, the chemical, physical and structural characterization were performed by means of X-Ray Diffraction (XRD) and observation of thin section by transmitted light optical microscopy (LOM), polarized microscope, Scanning Electron Microscope (SEM) attached with EDX and thermogravimetric (DTA & TGA). Additionally, microbiological study and chemical analyses of ground water were carried out. Results demonstrated that the deterioration of Shenhur was because of the forceful activity of the environment agents and soluble salts such as chlorides and sulphates. These results and information allowed that the identification of the types of salts and deterioration features might be used in the future for conservation purposes.
The Use of Genetic Approach to the Kinematics of Cutting  [PDF]
Nabil Wanas Musa
World Journal of Mechanics (WJM) , 2016, DOI: 10.4236/wjm.2016.610028
Abstract: This article deals with the use of an interdisciplinary approach to modelling and creation of a complex technical system of different physical nature in relation to the kinematics of cutting and shaping. The professor of the National Technical University of Ukraine, Kuznetcov Iu. N., proposed the approach based on generalization of knowledge, methodological basis of which is the theory of evolution of the systems and methods of genetic analysis and synthesis. For generalization of the knowledge in the fundamental sciences is based on the principles of a limited number of elementary generic structures with the introduction of the gene concept. The modelling and synthesis of kinematic cutting schemes are providing the efficiency and viability of genetic and morphological approach. The material point, which can interact with other ma-terial points in space and time, simulating anthropogenic system of different origin, is introduced as a material object.
Elastic Bending Deformation of the Drill Strings in Channels of Curve Wells  [PDF]
Nabil Wanas Musa
Modern Mechanical Engineering (MME) , 2017, DOI: 10.4236/mme.2017.71001
The problem about identification of elastic bending deformation of a drill string in a curve wells based on the theory of flexible curved rods and the direct inverse problems of drill string bending in the channels of curvilinear bore-holes is stated. The problem is solved which determines the resistance forces and moments during performing ascending-descending operations in curvilinear bore-holes with trajectories of the second order curve shapes. The sensitivity of the resistance forces relative to geometric parameters of the bore-hole axial line trajectories is analyzed.
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