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Search Results: 1 - 10 of 464051 matches for " Qayes A. Abbas "
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Structural and Characteristics of Manganese Doped Zinc Sulfide Nanoparticles and Its Antibacterial Effect against Gram-Positive and Gram-Negative Bacteria  [PDF]
Iftikhar M. Ali, Isam M. Ibrahim, Entissar F. Ahmed, Qayes A. Abbas
Open Journal of Biophysics (OJBIPHY) , 2016, DOI: 10.4236/ojbiphy.2016.61001
Abstract: The Manganese doped zinc sulfide nanoparticles of the cubic zinc blende structure with the average crystallite size of about 3.56 nm were synthesized using a coprecipitation method using Thioglycolic Acid as an external capping agent for surface modification. The ZnS:Mn2+ nanoparticles of diameter 3.56 nm were manufactured through using inexpensive precursors in an efficient and eco-friendly way. X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Fourier Transform Infrared (FTIR) spectroscopy are used to examine the structure, morphology and chemical composition of the nanoparticles. The antimicrobial activity of (ZnS:Mn2+) nanocrystals was investigated by measuring the diameter of inhibition zone using well diffusion mechanism versus two various bacterial strains. The technique of microorganism inactivation was considered as sorts-dependent. Bacillus subtilis showed the largest antibacterial sensitivity (35 mm) to ZnS: Mn2+ nanoparticles at a concentration (50 mM) whereas Escherichia coli offered maximum zone of inhibition (20 mm) at the same concentration. In this study, the results indicated that ZnS:Mn2+ nanoparticles were found to have significant antibacterial activity against Gram-negative (E. coli) and Gram-positive (Bacillus subtilis) bacteria.
Quality as Determinant Factor of Customer Satisfaction: Case Study of Zain-Kuwait  [PDF]
Hasan A Abbas
iBusiness (IB) , 2013, DOI: 10.4236/ib.2013.53B038

The potential of mobile communications market in Kuwait is enormous. Therefore, I test customer satisfaction in the Kuwaiti mobile market by examining the quality construct. In our study, quality is measured through the dimensions: interaction quality, environment quality, and outcome quality. Our results show that outcome quality is the most influential construct over satisfaction. Also, the results find that interaction quality is not significant and carries no important association with customer satisfaction.

On the number of colours in Quantum Chromodynamics
A. Abbas
Physics , 2000,
Abstract: It is commonly believed that ${\pi}^0 \to 2 \gamma$ decay shows that there are three colours in Quantum Chromodynamics (QCD). It is shown here that this is not correct. When correct colour dependent charges of the quarks are considered then it is shown that this decay does not make any statement about the number of colours in QCD.
The Problems of Rebuilding a State in Iraq 2003-2015  [PDF]
Murad A. Abbas, Radhi S. Jassam
Open Journal of Political Science (OJPS) , 2015, DOI: 10.4236/ojps.2015.54026
Abstract: The process of rebuilding the new state in Iraq has faced many internal and external problems. This study is going to focus on the internal problems; they are represented by the problem of national identity, setting the basis of the new Iraqi state, democracy, federalism, national reconciliation and governmental corruption. We selected those problems because we agreed with the consensus among Iraqi academic & political forces on attributing the continuity of instability & the increasing number of human casualties in Iraq to those specific problems. So, we think that solving those problems in accordance with strong national laws will lead to secure the building of Iraqi democratic state capable of making peaceful coexistence among its components based on their public acceptance to principles of liberty, citizenship, equality, pluralism and the separation of powers.
Dangers of Forming New Federal Regions in Iraq on Ethnic-Sectarian Bases  [PDF]
Murad A. Abbas, Radhi S. Jassam
Open Journal of Political Science (OJPS) , 2016, DOI: 10.4236/ojps.2016.63028
Abstract: This paper is an objective opinion of Iraqi professors, specialized in political science. It is concerning the application of federalism in Iraq. It deals with the problems created by the adoption of the federal system in Iraq after the year 2003. Iraqis are not yet prepared to work through such system, which has not developed through their own needs. After they will be finished with the ISIS, they will have to expand the application of the federal system throughout Iraq. Such an act will create many problems. If the new federal regions formed on a sectarian principle, this would cause higher instability in Iraq. In order to avoid having such problems, we need to strengthen the federal government through granted it more powers and authorities, so that, it could absorb peacefully the problems of the formation of new federal regions.
Finite Element Based Analysis of Magnetic Forces between Planar Spiral Coils  [PDF]
Abbas Shiri, Davoud E. Moghadam, Mohammad R. A. Pahlavani, Abbas Shoulaie
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2010, DOI: 10.4236/jemaa.2010.25040
Abstract: This paper elaborates on the magnetic forces between current carrying planar spiral coils. Direct and concentric rings methods are employed in order to calculate the magnetic force between these coils. The results obtained by two calculation methods show the efficiency of the replaced rings method in both simplicity and calculation time. Simula-tions using the Finite Element Method (FEM) are carried out to analyze the distribution of the magnetic flux density around the coils. Also, coils with precise size have been constructed and tested. The experimental results as well as the results obtained by FEM are used to validate the accuracy of the calculations.
A New Signature of Dark Matter
S. Abbas,A. Abbas,S. Mohanty
Physics , 1997,
Abstract: Dark matter capture and annihilation in planets and their satellites, in addition to producing neutrinos (already the basis of several ongoing experiments), is shown to lead to more significant heat generation in these bodies for a uniform dark matter halo. This thermal output becomes more prominent when clumped dark matter passes through the solar system. The dark matter annihilations should be treated as a new source of heat in the solar system which in some special cases may lead to unique imprints. Such new signatures of the dark matter are found in the generation of the puzzling magnetic field of Ganymede. This new source of heat perhaps cannot explain the formation and segregation of Ganymedean structure (which are probably due to conventional gravitational and radioactive heating), but provides a possible explanation of the origin of the Ganymedean magnetic field.
Evidence for Compact Dark Matter in Galactic Halos
S. Abbas,A. Abbas,S. Mohanty
Physics , 1999,
Abstract: Clumped dark matter arises naturally within the framwork of generic cosmological dark matter models. Invoking the existence of dark matter clumps can also solve may unexplained mysteries in astrophysics and geology or geophysics, eg. the galactic gamma-ray halo and the periodic terrestrial flood basalt volcanic episodes. Clumped dark matter is dynamically stable to friction and will not heat the disk. Such clumps may have already been discovered in the form of dwarf spheroidals, and further searches are encouraged by the results of this paper.
Thermal Description of Particle Production in Au-Au Collisions at STAR Energies
A. Tawfik,E. Abbas
Physics , 2013,
Abstract: The hadron ratios measured in central Au-Au collisions are analysed by means of Hadron Resonance Gas (HRG) model over a wide range of nucleon-nucleon center-of-mass energies ranging from 7.7 to 200 GeV as offered by the STAR Beam Energy Scan I (BES-I). We restrict the discussion on STAR BES-I, because of large statistics and over all homogeneity of STAR measurements (one detector) against previous experiments. Over the last three decades, various heavy-ion experiments utilizing different detectors (different certainties) have been carried out. Regularities in produced particles at different energies haven been studied. The temperature and baryon chemical potential are deduced from fits of experimental ratios to thermal model calculations assuming chemical equilibrium. We find that the resulting freeze-out parameters using single hard-core value and point-like constituents of HRG are identical. This implies that the excluded-volume comes up with no effect on the extracted parameters. We compare the results with other studies and with the lattice QCD calculations. Various freeze-out conditions are confronted with the resulting data set. The effect of feed-down contribution from week decay and of including new resonances are also analysed. At vanishing chemical potential, a limiting temperature was estimated as T=158.5 MeV with 3 MeV uncertainty.
Efficient Web-Based SCADA System
Hosny A. Abbas
Computer Science , 2015,
Abstract: Computer-based supervisory control and data acquisition (SCADA) systems have evolved over the past four decades, from standalone, compartmentalized operations into networked architectures that communicate across large distances. There is an emerging trend comprising SCADA and conventional IT units toward consolidating some overlapping activities. This trend is motivated by cost savings achieved by consolidating disparate platforms, networks, software, and maintenance tools. For reasons of efficiency, maintenance, economics, data acquisition, control platforms have migrated from isolated in-plant networks using proprietary hardware and software to PC-based systems using standard software, network protocols, and the Internet. In this thesis, we present an approach for web-based SCADA systems that adapt to the behavior of the target application. In addition, we take into account the real time constraints that imposed by the nature of the problem. We show that our approach is more efficient than other approaches in terms of consuming as little as possible of the available resources (computational power and network bandwidth).
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