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Search Results: 1 - 10 of 327141 matches for " Ammar S. Mahmood "
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The Movement of Orbits and Their Effect on the Encoding of Letters in Partition Theory  [PDF]
Rahmah J. Shareef, Ammar S. Mahmood
Open Access Library Journal (OALib Journal) , 2019, DOI: 10.4236/oalib.1105834
This research aims to study the movement of orbits proposed by Mohammed et al. in 2015 and 2016, and their impact on the encoding of letters adopted by Mahmood and Mahmood in 2019 in order to make the latter more difficult when read in the theory of partition.
Non Linear Techniques for Increasing Harvesting Energy from Piezoelectric and Electromagnetic Micro-Power-Generators
Yasser Ammar,S. Basrour
Computer Science , 2007,
Abstract: Non-linear techniques are used to optimize the harvested energy from piezoelectric and electromagnetic generators. This paper introduces an analytical study for the voltage amplification obtained from these techniques. The analytical study is experimentally validated using a macro model of piezoelectric generator. Moreover, the integration influences on these techniques is studied. Through all the obtained results, a suitable structure for autonomous microsystems is proposed.
A Study of Planting Method and Spacing on the Yield of Potato Using TPS
S. Mahmood
Asian Journal of Plant Sciences , 2005,
Abstract: An experiment was carried out at the Horticulture Farm of Bangladesh Agricultural University, Mymensingh to investigate the effect of planting method and spacing on the yield of potato using Cv. BARI TPS-2. The experiment consisted of (a) two planting methods viz., transplanting and direct sowing in the field, (b) two planting systems viz., single row and double row system and (c) three spacing viz., 50x5, 50x10 and 50x15 cm. The experiment was laid out in RCBD with 3 replications. Transplanting method produced the highest yield (46.09 t ha-1) by increasing plant height, fresh and dry weight of foliage and number and weight of tubers per plant than the direct sowing method (32.00 t ha-1). Double row system of planting and the plant spacing 50x5 cm produced the maximum yield 41.67 and 42.32 t ha-1, respectively. Transplanting with double row system gave the highest yield (48.98 t ha). Whereas, the transplanting with 50x5 cm spacing produced the maximum yield (50.72 t ha-1). The highest yield 44.19 t ha-1 was produced by the combination of double row and 50x5 cm. The combination of planting method, planting system and spacing produced marked effect on all parameters studied, being the highest yield (52.62 t ha-1) in the combination of transplanting, double row and 50x5 cm spacing.
CFD Prediction of the Turbulent Flow Generated in Stirred Square Tank by a Rushton Turbine  [PDF]
W. Chtourou, M. Ammar, Z. Driss, M. S. Abid
Energy and Power Engineering (EPE) , 2014, DOI: 10.4236/epe.2014.65010

The Computational Fluid Dynamics (CFD) have been used in the analysis and design of agitated vessel. Most of the researches done in this area are limited to the baffled or unbaffled stirred tank. In this paper, we have been interested in studying of the new design. Particularly, the flow and turbulence fields in square vessel stirred by a standard Rushton turbine have been simulated by means of CFD techniques. The Navier-Stokes equations governing the phenomenon of transfer of momentum are solved by a discretization method for finite volume. The MRF approaches can be used in simulation of the steady state problem. The numerical results from the application of CFD code Fluent with the stationary approach Multi Reference Frame (MRF) are presented in the planes containing the blade. The validation of CFD results with experimental measurements showed a good agreement.

Osteogenesis of MC3T3 Preosteoblasts on 3D Bioactive Peptide Modified Nano-Macroporous Bioactive Glass Scaffolds  [PDF]
Colin Przybylowski, Mohamed Ammar, Courtney LeBlon, Sabrina S. Jedlicka
Journal of Biomaterials and Nanobiotechnology (JBNB) , 2015, DOI: 10.4236/jbnb.2015.63015
Abstract: Biointerface design that targets osteogenesis is a growing area of research with significant implications in biomedicine. Materials known to either support or stimulate osteogenesis are composed of a biomimetic ceramic material, such as bioactive glass. Bioactive glass is osteoproductive, and the potential for osteoproductivity can be enhanced by the addition of proteins or other additives designed to alter functionality. In addition, soluble growth factors are often added to osteogenic culture on bioactive glasses, further intensifying the effects of the material. In this paper, synthetic peptide combinations, covalently bound to a three-dimensional bioactive glass network, are used to mimic the effects of the whole fibronectin and bone morphogenetic proteins (BMP) 2 and 9. Peptide-silanes possessing critical binding sequences from each of these proteins are synthesized and used to decorate the surface of three-dimensional (3D) nano-macroporous bioactive glass. MC3T3 preosteoblast cells are then assessed for differentiation on the materials in the absence of soluble differentiation cues. MC3T3 preosteoblasts undergo enhanced differentiation on the peptide-silane samples over the standard nano-macroporous bioactive glass, and the differentiation capacity of the cells exposes only to peptide-silane surfaces approaches that of cells grown in chemical differentiation induction media.
Effect of Wheat Germ Addition on Physicochemical and Antioxidant Properties of Date Syrup
Abdalla S.M. Ammar
American Journal of Food Technology , 2012,
Abstract: Wheat germ was utilized for improvement in quality and nutritive value of date syrup in the present study. Some physicochemical (total soluble solids, water activity, pH, consistency, color) and antioxidant properties of different date syrup/wheat germ blends (0, 2, 4, 6, 8 and 10% wheat germ) were investigated. Total soluble solids and pH of date syrup were slightly affected by addition of wheat germ. The consistency values of blends were increased by increasing wheat germ addition, while, water activity values were gradually decreased (0.677-0.655). Significant differences (p<0.05) in the CIE L* a* b* color values for date syrup/wheat germ blends were noticed. The phenolic content of blends was slightly affected by wheat germ addition. Non significant differences (p<0.05) were observed in the antioxidant activity (192-200 TEAC μmol/100 g sample) among the date syrup/wheat germ blends. Results showed that blends containing 2, 4 and 6% wheat germ presented a higher overall acceptability. The obtained results suggest that wheat germ could be used for improvement in quality and nutritive value of date syrup.
Reverse-Osmosis Desalination of Water Powered by Photo-Voltaic Modules  [PDF]
Ammar Alkhatib
Computational Water, Energy, and Environmental Engineering (CWEEE) , 2014, DOI: 10.4236/cweee.2014.31003

The rising of the world’s population leads automatically to the rising of water demand. As a consequence the lack of drinking water increases. Currently, approximately 1.2 billion people globally (one-sixth of the world’s population) do not have access to adequate clean water. Since a large part of the world’s population is concentrated in coastal areas, the desalination of seawater seems to be a promising solution, especially in our Arab world. An innovative stand-alone solar desalination system could be used to produce drinking water from seawater or any brackish water sources. The great advantage of such a system is that it combines efficient desalination technology, reverse osmosis, with a renewable energy source; the main goal is improving the technical feasibility of such systems. There are many advantages of this coupling with RE resources; first of all we separate the drinking water from the electricity grid and its faults, save the burning fossil fuel and its emissions and can provide fresh water to remote communities that do not have sufficient traditional energy sources; but as we see in the thesis we don’t have economic benefit; because these projects depend on the electricity cost in each country and its location and its solar specifications. We design and implement a small laboratorial model for PV-RO (Photo-Voltaic Powered Reverse Osmosis) to recognize the its performance for seawater and brackish

A Decision Tree Classifier for Intrusion Detection Priority Tagging  [PDF]
Adel Ammar
Journal of Computer and Communications (JCC) , 2015, DOI: 10.4236/jcc.2015.34006
Abstract: Snort rule-checking is one of the most popular forms of Network Intrusion Detection Systems (NIDS). In this article, we show that Snort priorities of true positive traffic (real attacks) can be approximated in real-time, in the context of high speed networks, by a decision tree classifier, using the information of only three easily extracted features (protocol, source port, and destination port), with an accuracy of 99%. Snort issues alert priorities based on its own default set of attack classes (34 classes) that are used by the default set of rules it provides. But the decision tree model is able to predict the priorities without using this default classification. The obtained tagger can provide a useful complement to an anomaly detection intrusion detection system.
Comparison of Feature Reduction Techniques for the Binominal Classification of Network Traffic  [PDF]
Adel Ammar
Journal of Data Analysis and Information Processing (JDAIP) , 2015, DOI: 10.4236/jdaip.2015.32002
Abstract: This paper tests various scenarios of feature selection and feature reduction, with the objective of building a real-time anomaly-based intrusion detection system. These scenarios are evaluated on the realistic Kyoto 2006+ dataset. The influence of reducing the number of features on the classification performance and the execution time is measured for each scenario. The so-called HVS feature selection technique detailed in this paper reveals many advantages in terms of consistency, classification performance and execution time.
A remark on the intersection of the conjugates of the base of quasi-HNN groups
R. M. S. Mahmood
International Journal of Mathematics and Mathematical Sciences , 2004, DOI: 10.1155/s0161171204309191
Abstract: Quasi-HNN groups can be characterized as a generalization of HNN groups. In this paper, we show that if G∗ is a quasi-HNN group of base G, then either any two conjugates of G are identical or their intersection is contained in a conjugate of an associated subgroup of G.
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