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Search Results: 1 - 10 of 192239 matches for " Nasser Moh`d Alshibly "
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Fitness and Crossing Over Frequency of the Mutants Drosophila melanogaster in Dependence upon Age and Artificial Reorganizations of a Genotype
Nasser Moh`d Alshibly
Research Journal of Biological Sciences , 2012, DOI: 10.3923/rjbsci.2011.192.199
Abstract: The objective of the given research is to study changes in crossing over frequency and state of main components of fitness at linear flies D. Melanogaster in dependence on age and experimentally created modifications in the genotype. Research techniques are traditional and well applied in genetics methods of revealing main components of fitness D. melanogaster in particular fertility, survival in extreme conditions (high temperature exposure and starvation), life expectancy etc., are used. Beside before mentioned physiological components of fitness genetic (defining crossing over frequency) and genetic biochemical (defining functional state of gene-enzymatic system Adh) characteristics of fitness are also applied. Crossing over frequency, activity and thermal resistance have been defined with the help of common methods. Being guided and published in special literature data we have used these characteristics to evaluate viability and general fitness of D. melanogaster. Reliability of the obtained data has been evaluated according to student criterion (p<0.05). The analysis result prove that fertility differs in mutants according to the age except the wild type which has more ability in fertility and unchangeable with age and all the mutants lines of Drosophila melanogaster (b, cn, cn and vg) have more fertility than the others. The data of showed that the mutant liens of Drosophila maelanogaster (b, cn, cn and vg) have more fertility than the other mutants. This fact should be taken into consideration while creating new genotypes through outbreeding, genetic engineering and while developing genetic theories of maturation and aging.
The Effects of Liposome Composition and Temperature on the Stability of Liposomes and the Interaction of Liposomes with Human Neutrophils
Omar Moh`d Atrouse
Pakistan Journal of Biological Sciences , 2002,
Abstract: The effects of temperature and lipid composition on the liposome stability (fusion) in vitro were studied. It has been obscure that temperature affects phosphatidylcholine (PC) liposomes stability and the optical densities of these liposomes were increased with time (days), while incorporation of cholesterol 25 mol % to the liposomes (PC: cholesterol) reduce the temperature`s effects and the optical densities show a very slight change with time (days) because cholesterol in high concentrations prevent the phospholipids packing and induce orientation and more rigidity to those phospholipids and therefore prevent liposome aggregation, even if the oxidation of these lipids takes place (diene production and formation of lyso compounds). Interaction of these liposomes with human neutrophils was also studied. The liposomes containing cholesterol is more efficient in enhancing the activity of these cells than PC liposomes.
Characterization of the Secondary Porosity of Some Cretaceous-Recent Jordanian Building Limestones
Basem K. Moh`d
Journal of Applied Sciences , 2007,
Abstract: Different types of limestone (including chalk, travertine, marble, wacke stone and packstone-grainstone) commonly used as building stones in Jordan with porosity ranging from around 1% to less than 30% have been covered in this study. The total porosity has been split into matrix and secondary porosity. Types (fracture/moldic) and amounts of secondary porosity have also been defined. The relationships of the different porosity types with the other measured or derived properties have been delineated using correlation. Mathematical formulae have been presented to derive complicated or difficult to measure properties from easily measured ones. As indicated by the calculated cementation exponent value m and documented petrographically, tight limestones are dominated by fracture porosity, whereas highly porous limestones are dominated by moldic porosity. This is well exemplified by Siwaqa travertine where vugs are dominant in the high porosity varieties and fractures in the low porosity samples. Practical implications of the present work and its limitations have also been discussed.
Experimental Investigation of “Scale Influence on Plastic Rotational Capacity of Reinforced Concrete Beams”  [PDF]
Mohd El Khatieb
Engineering (ENG) , 2016, DOI: 10.4236/eng.2016.84017
Abstract: The importance of the geometrical effect in practical design has been evaluated, showing that an overestimation of the actual member rotation is very likely if the available rotation capacity is based on the evaluation of the behavior of the reference members within a limited size range. The increase of ductility with decreasing member size has been interpreted in fracture mechanics of reinforced concrete. In fracture mechanics it’s seen that beams with higher dimensions are brittle, while those with small dimensions are ductile, so it’s important here to clarify if the same material and design concepts can be applied for reinforced concrete beams with different scales. Three point bending test was executed on 20 reinforced concrete beams varying scale and slenderness ratio (where steel ratio being kept constant). The experimental results obtained varying beam slenderness and beam depth will be used to analyze the structural response for a practical construction, taking in consideration the size effect, these beams are normally designed in such a way that the distribution of their internal forces over the transversal section has been calculated as per elastic beam theory, while the beam dimension will be designed as per the ultimate limit state to obtain a ductile response of the reinforced concrete beams which is necessary to guarantee the structural safety [1].
Hardware Performance Evaluation of SHA-3 Candidate Algorithms  [PDF]
Yaser Jararweh, Lo’ai Tawalbeh, Hala Tawalbeh, Abidalrahman Mohd
Journal of Information Security (JIS) , 2012, DOI: 10.4236/jis.2012.32008
Abstract: Secure Hashing Algorithms (SHA) showed a significant importance in today’s information security applications. The National Institute of Standards and Technology (NIST), held a competition of three rounds to replace SHA1 and SHA2 with the new SHA-3, to ensure long term robustness of hash functions. In this paper, we present a comprehensive hardware evaluation for the final round SHA-3 candidates. The main goal of providing the hardware evaluation is to: find the best algorithm among them that will satisfy the new hashing algorithm standards defined by the NIST. This is based on a comparison made between each of the finalists in terms of security level, throughput, clock frequancey, area, power consumption, and the cost. We expect that the achived results of the comparisons will contribute in choosing the next hashing algorithm (SHA-3) that will support the security requirements of applications in todays ubiquitous and pervasive information infrastructure.
Simplified Methods for Eigenvalue Assignment  [PDF]
Omar Mohd El-Basheer El-Ghezawi
Advances in Pure Mathematics (APM) , 2015, DOI: 10.4236/apm.2015.57037
Abstract:

A state feedback method of reduced order for eigenvalue assignment is developed in this paper. It offers immediate assignment of m eigenvalues, with freedom to assign the remaining n-m eigenvalues. The method also enjoys a systematic one-step application in the case where the system has a square submatrix. Further simplification is also possible in certain cases. The method is shown to be applicable to uncontrollable systems, offering the simplest control law when having maximum uncontrollable eigenvalues.?

Explicit Determination of State Feedback Matrices  [PDF]
Omar Mohd El-Basheer El-Ghezawi
Advances in Pure Mathematics (APM) , 2015, DOI: 10.4236/apm.2015.57040
Abstract: Methods which calculate state feedback matrices explicitly for uncontrollable systems are considered in this paper. They are based on the well-known method of the entire eigenstructure assignment. The use of a particular similarity transformation exposes certain intrinsic properties of the closed loop w-eigenvectors together with their companion z-vectors. The methods are extended further to deal with multi-input control systems. Existence of eigenvectors solution is established. A differentiation property of the z-vectors is proved for the repeated eigenvalues assignment case. Two examples are worked out in detail.
FORECASTING HIGHER EDUCATION IN JORDAN USING STATISTICAL TECHNIQUES
Dr. Moh'd Mahmoud Ajlouni
Economics and Finance Review , 2011,
Abstract: The tendency towards higher education largely influences the balance of the supply and demand of the higher education industry in Jordan. Building upon several numerical assumptions, this paper estimates the demand for and supply of higher education in Jordan for the next decade 2011-2020 employing growth, actual and quality ratio of students per staff models. The results show that, according to the actual ration model, current higher education providers in Jordan will be able to enroll more students and with least shortage levels over the next decade. While according to quality ration model the capacity of current higher education providers will not be able to enroll the growing demand levels. In between is the growth model; however, its results are more alike the actual ration model, but with larger variations either in the shortage period or in the surplus one.
The Lean Supply Practices in the Garments Manufacturing Companies in Jordan
Ziad Mohd. Ali Smadi
International Business Research , 2012, DOI: 10.5539/ibr.v5n4p88
Abstract: The purpose of this study is to identify the extent of applying lean supply practices in the Garments manufacturing companies in Jordan, five variables were selected to be studied since the researcher believes that, they represent the lean supply concept, these variables are, Supplier feedback, Just in time delivery by suppliers, Supplier development, Customer involvement and Facilitation of just in time production, a survey questionnaire was distributed for that purpose to those who occupy managerial positions in those companies, the study revealed that the Garments Manufacturing Companies in Jordan adoption to the lean supply practices is considerably high at all aspects, except for supplier development which was given average rating.
Application of Neural Net Modeling and Inverse Control to the Desulphurization of Hot Metal Process
Mohd Sami” S. Ashhab
Jordan Journal of Mechanical and Industrial Engineering , 2007,
Abstract: Optimization techniques are powerful in determining inputs to a process that will drive its output to a desired target. Thisinverse control problem reduces to minimizing a positive cost function that measures the difference between the output andits target value. In this paper, we present a method for inverse control that uses a combination of artificial neural net modelingand optimization. We apply this method to the desulphurization of hot metal process. In this steel industry application, thesulphur content of hot metal, obtained at the end of calcium carbide powder injection into 400 ton torpedo ladles is predictedas a function of hot metal weight, treatment time, initial sulphur content, gas flow rate, and powder injection rate. Based onthe prediction model, the optimization algorithm coordinates the five inputs or part of them to achieve a desired sulphurcontent in the hot metal.
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