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Search Results: 1 - 10 of 3344 matches for " Muna Moussa Abbas "
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Electrochemical Self-Assembly of Nanoporous Alumina Templates Title  [PDF]
Muna Moussa Abbas
Advances in Materials Physics and Chemistry (AMPC) , 2013, DOI: 10.4236/ampc.2013.35035
Abstract: Porous alumina was fabricated electrochemically through anodic oxidation of aluminum by means of such a self-organized method. Anodic aluminium oxide (AAO) template with nanopores was grown by two-steps anodization processes from a high purity aluminium foil. The anodization process was carried out in a phosphoric acid electrolyte at ambient temperature with a different duration of anodization. The analysis observation by Atomic Force Microscopy (AFM) showed that nanopore size increased with anodization time. The nanopore sizes of porous alumina were (16.04, 26.19 and 37.39 nm) for (1, 2 and 3 hour) respectively.
Investigating the Preparation Conditions on Superconducting Properties of Bi2-x LixPb0.3Sr2Ca2Cu3O10+δ  [PDF]
Muna Musa Abbas, Saad Frhan Oboudi, Nadein Qahtan Raoof
Materials Sciences and Applications (MSA) , 2015, DOI: 10.4236/msa.2015.64036
Abstract: One and multi-step solid state reaction methods were used to prepare a high temperature superconductor with a nominal compositionBi2-x LixPb0.3Sr2Ca2Cu3O10+δ for ( 0 ≤ x ≤ 0 .5). T he effect o f preparation conditions and substituting Li on Bi sites had been investigated by the use of X-ray diffraction, resistance measurements and oxygen content to obtain the optimum conditions for formation and stabilization of the 2223-phase. It has been found that intermediate grinding will force to convert and accelerate the formation rate of the 2223-phase. The morphological analyses were carried out by SEM. The results showed that the multi-step technique was appropriate to prepare the compositio Bi2-x LixPb0.3Sr2Ca2Cu3O10+δ . X-ray diffraction analysis showed two phases: high-TC phase 2223 and low-TC phase 2212 with orthorhombic structure for all samples. However, the optimum concentration was found for 0.3 which improved the microstructure and had the highest TC? value 130 K for the highest value of oxygen content.
Evaluation and Analysis of Oil Shale in Quseir-Safaga and Abu-Tartur Western Desert, Egypt  [PDF]
El-Abbas Moustafa, Ahmed Noah, Adel Salem, Ahmed Nehad, Maureen Amir, Mohamed Nosr, Radwa Awad, Mahmoud Gomaa, Marawan Moussa
Journal of Surface Engineered Materials and Advanced Technology (JSEMAT) , 2014, DOI: 10.4236/jsemat.2014.42009
Abstract:

Seeking ways to diminish Egypt’s dependency on foreign oil imports, we had to look for the obvious resources to exploit. Oil shale is one of Egypt’s resources that are left abandoned and not used. This project is aiming at introducing both experimental analysis for oil shale in Egypt and the best production technique for it. This study is about experimentally analyzing different samples of potential oil shale fields in Egypt. Samples that are analyzed in this project are from two locations in Egypt: Quseir-Safaga and Abu-Tartur Western Desert, and they are compared to one of the best oil shale fields in the world, which is from Green River Formation Colorado. The experiments were done using AUC lab retort to experimentally determine the critical temperature that will lead to the maximum production using sudden and gradual change in temperatures, which turned out to be sudden change at 500°C. Thereafter, the degree of API gravity was calculated for each run. Then the oil samples were determined for impurities and liquid chromatography results in the Egyptian Petroleum Research Institute. Part two of the study plan has been included to determine the ultimate ways of producing efficiently, ecologically and economically.

Derivative spectrophotometric method for simultaneous determination of ezetimibe and simvastatin in combined tablets
Bahia Abbas Moussa,Marwa Fadel Mohamed,Nadia Fayek Youssef
European Journal of Chemistry , 2010, DOI: 10.5155/eurjchem.1.4.348-351.110
Abstract: The introduced study portrays the development and validation of an effortless, speedy and selective first order derivative zero-crossing spectrophotometric method to estimate ezetimibe and simvastatin simultaneously in combined drug products over and above in the presence of ezetimibe alkaline degradation products. Ezetimibe and its alkaline degradates spectra showed zero-crossing point at 249 nm, so the amplitude at 249 nm could be used for calculating the concentration of simvastatin. While simvastatin and ezetimibe alkaline degradates spectra showed a zero-reading value at 261 nm, so ezetimibe could be determined by measuring the amplitude at 261 nm. Regression plots revealed good linear relationships in the concentration range 1-16 μg/mL with accuracy checked by conducting recovery studies; average recovery was 99.61 ± 1.183 and 100.47 ± 1.310 for ezetimibe and simvastatin, respectively. The suggested first derivative spectrophotometric method was successfully applied for the determination of the cited drugs in "Inegy 10/10, 10/20 and 10/40 tablets". Satisfactory results were obtained for the recovery of both drugs and were in good agreement with the labeled amounts. Method validation was estimated according to USP guidelines.
A Comparative Study on The Production of Concentrates of Anthrax Live Spore Vaccine in Roux Flasks and in Fermenter
Abbas Mohamed Ahmed,N.T. Mekki,Muna O. Elhaj,Sarah Mohamed Abusalab
Journal of Animal and Veterinary Advances , 2012,
Abstract: Forty batches of anthrax spore vaccine were produced by bioreactor and by Roux flask, 20 batches were obtained from each system. The number of doses produced in the flask system was found 10 times more than those obtained by the bioreactor. It is recommended to continue producing this vaccine by the Roux flask while research will go on to improve suitable conditions in the fermenter in order to obtain high doses and to avoid the drawbacks of the flask system.
Experimental Investigation of the Early Stage of Precipitation on Binary Al-Li, Al-Cu Alloys and Ternary Al-Li-Cu Alloys by Means of Atom Probe Tomography  [PDF]
Muna Khushaim, Torben Boll
Open Journal of Metal (OJMetal) , 2016, DOI: 10.4236/ojmetal.2016.62003
Abstract:
Aluminum-based alloys play a key role in modern engineering and are widely used in construction components in aircraft, automobiles and other means of transportation due to their light weight and superior mechanical properties. Introduction of different nano-structure features can improve the service and the physical properties of such alloys. An improvement of an Al-based alloy has been performed based on the understanding of the relationships among compositions, processing, microstructural characteristics and properties. Knowledge of the decomposition process of the microstructure during the precipitation reaction is particularly important for future technical developments. The objective of this study is to investigate the nano-scale chemical composition in the Al-Cu, Al-Li and Al-Li-Cu alloys during the early stage of the precipitation sequence and to describe whether this compositional difference correlates with variations in the observed precipitation kinetics. Investigation of the fine scale segregation effects of dilute solutes in aluminum alloys which were experienced different heat treatments by using atom probe tomography has been achieved. The results show that an Al-1.7 at.% Cu alloy requires a long ageing time of approximately 8 h at 160°C to allow the diffusion of Cu atoms into Al matrix. For the Al-8.2 at.% Li alloy, a combination of both the natural ageing condition (48 h at room temperature) and a short artificial ageing condition (5 min at 160°C) induces increasing on the number density of the Li clusters and hence increase number of precipitated particles. Applying this combination of natural ageing and short artificial ageing conditions onto the ternary Al-4 at.% Li-1.7 at.% Cu alloy induces the formation of a Cu-rich phase. Increasing the Li content in the ternary alloy up to 8 at.% and increasing the ageing time to 30 min resulted in the precipitation processes ending with δ' particles. Thus the results contribute to the understanding of Al-alloy design.
A Generalization of Ince’s Equation  [PDF]
Ridha Moussa
Journal of Applied Mathematics and Physics (JAMP) , 2014, DOI: 10.4236/jamp.2014.213137
Abstract: We investigate the Hill differential equation \"\" where A(t), B(t), and D(t) are trigonometric polynomials. We are interested in solutions that are even or odd, and have period π or semi-period π. The above equation with one of the above conditions constitutes a regular Sturm-Liouville eigenvalue problem. We investigate the representation of the four Sturm-Liouville operators by infinite banded matrices.
Fourier transform infrared spectroscopy for in-process inspection, counterfeit detection and quality control of anti-diabetic drugs
Faten Farouk,Bahia Abbas Moussa,Hassan Mohamed El-Said Azzazy
Spectroscopy: An International Journal , 2011, DOI: 10.3233/spe-2011-0531
Abstract: The purpose of this study is to develop simple and cost-effective Fourier transform infrared (FT-IR) methods for quality control evaluation of repaglinide (RPG), rosiglitazone maleate (RGZ), pioglitazone hydrochloride (PGZ) and metformin hydrochloride (MET) and assess their use for in-process quality control and detection of counterfeit medicine. The conventional KBr disc sampling technique used in FT-IR does not result in constant path-length thus impeding the use of this sensitive and simple technique for quantification of drugs. In this study, FT-IR quantitative assays were developed using a constant KBr disc pathlength to quantify drugs in bulk and tablets. Method validation was done according to the International Conference on Harmonization (ICH) guidelines and recovery studies were performed by applying standard addition technique. Samples representing pitfalls at different tablet manufacturing stages and counterfeit medicines were prepared and tested by FT-IR. The developed methods achieved ICH validation parameters. Statistical comparison of the results with reference or reported methods showed no significant difference with respect to method accuracy and precision. The methods were applicable to tablet dosage form with average recovery ranging between 99 and 102%. The developed methods are capable of detecting impurities that result from in-process manufacturing problems and counterfeit products and are inclusive for in-process and end product testing.
A Qualitative Exploration of Help-Seeking Process  [PDF]
Muna Abdullah Al-Bahrani
Advances in Applied Sociology (AASoci) , 2014, DOI: 10.4236/aasoci.2014.47020
Abstract:

Matriculation to college life can often pose adjustment problems that require identification and help. This is especially true in societies where gender separation is the norm. This qualitative study explores the help-seeking process from the subjective and cultural perspective of Omani students. The processes of help-seeking behavior within the Omani cultural framework are explored in terms of recognizing, defining a problem, making decision, and selecting sources of help. A triangulation methodology was used in this study that included two and half months of observation and interaction at Sultan Qaboos University in the office of Deanship of Student Affairs, the Counseling Center, and the Psychiatric Department of the university hospital. Individual and focus-group interviews were conducted. The interviews were, for the most part, extensive dialogues. Statistical documents in regard to students’ academic probation as well as newspaper articles aided in understanding the Omani help-seeking process. The results show that Omani students experience multiple challenges that impact their psychological adjustments. These challenges can be associated with the novelty of academic life and the coeducational culture of the institution. Some freshmen face with new expectations of learning as well as separation from their close ties, and struggle to find a balance between some of their traditional points of reference and the new sets of values to which they are exposed at Sultan Qaboos University. The influence of traditional culture on the dynamics of problem recognition may be expressed by anger and rejection, declining academic achievement, and violation of religious principles. For these students, traditional values and religious practices are seen as key coping mechanisms.

Innovative Culture: An Intervention Strategy for Sustainable Growth in Changing Scenario
Muna Kalyani
International Journal of Business Administration , 2011, DOI: 10.5430/ijba.v2n4p84
Abstract: To-day’s era is very hypercompetitive, a key feature of the new economy in the changing business scenario. The pace of change is increasing at an exponential rate. Continuous change and maintenance of high standards of quality products, services and processes have become prerequisites of the organization’s success in to-day’s competitive world. Organizations can rarely stand still for long. In highly competitive environment, where competition is global and innovation is continuous, change has become a core competency of organizations. Change refers to making things different. Innovation is a more specialized kind of change. All innovation involves change, but not all changes necessarily involve new ideas or lead to significant improvement or radical breakthroughs. Competitive climate requires organizations to institutionalize the process of innovation –to plant the seeds of innovations can utterly transform a scenario, involves the unfreezing-change-refreezing process. Innovation is not a thing that can be purchased or installed like a computer system. Rather it is a culture that must be adopted and nurtured which extracts values from assets old and new, and rejuvenates and revolutionizes industry, society and business. Innovation is an act of changing the established way of doing things, the ability to turn knowledge into value and link emerging technologies with emerging markets and is about bringing creative new ideas to life. The process involves the ways in which norms and values are set and practiced, holds innovative driven culture. This innovative culture can give competitive advantage; provided it is deeply rooted in the functional aspects of the organizations’ culture, where the productive potential of people’ knowledge and actions are guided and governed by the spirit and principles of OCTAPACE and innovative cultures. These cultures get into hyper drive mode to keep growth engine humming. The article examines this context and argues that organizations can use innovative culture as a strategic intervention for managing change for survival and growth.
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