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Search Results: 1 - 10 of 419111 matches for " Sa’di M. Abdul Jawad "
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On the Electrical and Optical Properties of Polycarbonate /MNCl2 Composite  [PDF]
Hasan M. El Ghanem, Subhi A. Saq’an, Mahmoud Al Saadi, Sadi M. Abdul Jawad
Journal of Modern Physics (JMP) , 2011, DOI: 10.4236/jmp.2011.212189
Abstract: The nature of the MnCl2 salt as a filler to polycarbonate , including their composition, particles dimensions and homogeneity of distribution have been studied using different spectroscopic techniques (XRD, DSC and TGA). A slight increases in the chain-chain separation due to the interaction of the MnCl2 salt with the polycarbonate chains was observed , while a decrease in the optical energy gap (Eopt ) of the polycarbonate polymer with increasing the salt concentration was detected .However employing impedance spectroscopy in the frequency range 10Hz up to 106 Hz. reveals an increase in the dielectric permittivity and conductivity with increasing salt content
Energy Contents of a Class of Regular Black Hole Solutions in Teleparallel Gravity
M. Sharif,Abdul Jawad
Physics , 2010, DOI: 10.1142/S0217732310034614
Abstract: In this paper, we discuss the energy-momentum problem in the realm of teleparallel gravity. The energy-momentum distribution for a class of regular black holes coupled with a non-linear electrodynamics source is investigated by using Hamiltonian approach of teleparallel theory. The generalized regular black hole contains two specific parameters $\alpha$ and $\beta$ (a sort of dipole and quadrupole of non-linear source) on which the energy distribution depends. It is interesting to mention here that our results exactly coincide with different energy-momentum prescriptions in General Relativity.
Energy Contents of Some Well-Known Solutions in Teleparallel Gravity
M. Sharif,Abdul Jawad
Physics , 2010, DOI: 10.1007/s10509-010-0420-0
Abstract: In the context of teleparallel equivalent to General Relativity, we study energy and its relevant quantities for some well-known black hole solutions. For this purpose, we use the Hamiltonian approach which gives reasonable and interesting results. We find that our results of energy exactly coincide with several prescriptions in General Relativity. This supports the claim that different energy-momentum prescriptions can give identical results for a given spacetime. We also evaluate energy-momentum flux of these solutions.
Interacting Modified Holographic Dark Energy in Kaluza-Klein Universe
M. Sharif,Abdul Jawad
Physics , 2011, DOI: 10.1007/s10509-011-0893-5
Abstract: The interaction of modified holographic dark energy and dark matter with varying $G$ in flat Kaluza Klein universe is considered. Further, we take infrared cutoff scale $L$ as future event horizon. In this scenario, equations of state parameter as well as evolution are explored. We also check the validity of the generalized second law of thermodynamics. It is interesting to mention here that our results show consistency with the present observations.
Cosmological Evolution of Interacting New Holographic Dark Energy in Non-flat Universe
M. Sharif,Abdul Jawad
Physics , 2012, DOI: 10.1140/epjc/s10052-012-2097-8
Abstract: We consider the interacting holographic dark energy with new infrared cutoff (involving Hubble parameter and its derivative) in non-flat universe. In this context, we obtain the equation of state parameter which evolutes the universe from vacuum dark energy region towards quintessence region for particular values of constant parameters. It is found that this model always remains unstable against small perturbations. Further, we establish the correspondence of this model having quintessential behavior with quintessence, tachyon, K-essence and dilaton scalar field models. The dynamics of scalar fields and potentials indicate accelerated expansion of the universe which is consistent with the current observations. Finally, we discuss the validity of the generalized second law of thermodynamics in this scenario.
Thermodynamics in Closed Universe with Entropy Corrections
M. Sharif,Abdul Jawad
Physics , 2013, DOI: 10.1142/S0218271813500144
Abstract: We discuss the generalized second law of thermodynamics in three different systems by taking quantum corrections (logarithmic and power law) to cosmological horizon entropy as well as black hole entropy. Firstly, we consider phantom energy accretion onto the Schwarzschild black hole in the closed FRW universe and investigate validity of the generalized second law of thermodynamics on the apparent and event horizons. In another scenario, we evaluate the critical mass of the Schwarzschild black hole with upper and lower bounds under accretion process due to phantom-like modified generalized chaplygin gas. It is found that the generalized second law of thermodynamics is respected within these bounds and black hole cannot accrete outside them. Finally, we explore this law for a closed universe filled with interacting $n$-components of fluid (in thermal equilibrium case) and with non-interacting dark matter and dark energy components (in thermal non-equilibrium case) on the apparent and event horizons and find conditions for its validity.
The Toxic Effects of Crude Oil in Some Freshwater Cyanobacteria  [PDF]
Abdul Hameed M. Jawad Al Obaidy, Muwafaq H. M. Lami
Journal of Environmental Protection (JEP) , 2014, DOI: 10.4236/jep.2014.55039
Abstract:

Toxicity effect of the Iraqi crude oil on the growth of two Cyanobacteria strains Microcystis flos-aquae (Wittr.) Kircher (unicellular) and Nostoc carneum Agardh (filamentous) was studied basing on it is biomass expressed as chlorophyll-a (μg/ml). Growth rate and doubling time of the cells were also calculated accordingly in present or absent of the crude oil. Also, Microscopical examination was observed to detect the morphological changes. Both species appeared different responses towards oil toxic influences with different concentrations and time of exposure. Growth was decreased gradually with Microcystis with addition of 10, 30, 50 and 70 mg/l of the crude oil, slightly toxic effects were observed with Nostoc in comparison to the control. Different significant correlations (P ≤ 0.05) were observed between growth of the cyanobacteria and the oil concentrations. Furthermore, results demonstrated that Microcystis was considered to be more sensitive than Nostoc towards crude oil concentrations.

Evaluation of Treated Municipal Wastewater Quality for Irrigation  [PDF]
Abdul Hameed M. Jawad Alobaidy, Mukheled A. Al-Sameraiy, Abass J. Kadhem, Athmar Abdul Majeed
Journal of Environmental Protection (JEP) , 2010, DOI: 10.4236/jep.2010.13026
Abstract: Wastewater reuse is a useful tool in minimizing the amount of wastewater in the environment. Therefore, evaluation of the suitability of Al-Rustamiyah WWTP municipal treated wastewater for irrigation was made according to its compo-sition and the international irrigation water quality standards. In addition, to classify water quality and to evaluate its suitability for irrigation purposes, Sodium Adsorption Ratio (SAR), Soluble Sodium Percentage (SSP) and Residual Sodium Carbonate (RSC) were calculated following standard equations and found experimentally as (2.11), (35.67) and (–12.75) respectively. Plotting the values of conductivity (EC) and sodium absorption ratio (SAR) on the US salinity diagram illustrated that most of the samples fall in the field of C3-S1, indicating high salinity and low sodium water which can be used for irrigation on almost all types of soil without danger of exchangeable sodium. Furthermore, the data indicate slight to moderate degree of restriction on the use of this treated wastewater in irrigation due to chloride hazard. RSC value is negative at all sampling sites, indicating that there is no complete precipitation of calcium and magnesium. Overall, the treated wastewater can be classified with few exceptions as suitable for irrigation use.
On the Current and Restoration Conditions of the Southern Iraqi Marshes: Application of the CCME WQI on East Hammar Marsh  [PDF]
Azhar Al-Saboonchi, Abdul-Razak M. Mohamed, Abdul Hameed M. Jawad Alobaidy, Haider S. Abid, Bahram K. Maulood
Journal of Environmental Protection (JEP) , 2011, DOI: 10.4236/jep.2011.23035
Abstract: Water quality of the East Hammar marsh after restoration was assessed by using the Canadian Council of Ministers of the Environment Water Quality Index (CCME WQI).The model was applied in two approaches based on the historical data and the CCME aquatic life guidelines as objectives. Variables included in the index calculation were Water Temperature, Dissolved Oxygen, Salinity, pH value, Total Nitrogen, Ammonia, Nitrate, Phosphorus and Sodium. The CCME WQI analysis in both approaches reflected that water quality of the East Hammar marsh is rated as poor based on 2005-2006 data, meaning that the conditions of the marsh are often depart from natural or desirable levels particularly in respect to sodium and nitrogenous compounds; it simply has not recovered yet. The results reflect that the marsh area is still far from the current guideline criteria and, too far from restoration.
Application of Water Quality Index for Assessment of Dokan Lake Ecosystem, Kurdistan Region, Iraq  [PDF]
Abdul Hameed M. Jawad Alobaidy, Haider S. Abid, Bahram K. Maulood
Journal of Water Resource and Protection (JWARP) , 2010, DOI: 10.4236/jwarp.2010.29093
Abstract: Water Quality Index (WQI) was applied in Dokan Lake, Kurdistan region, Iraq using ten water quality parameters (pH, Dissolved Oxygen, Turbidity, Conductivity, Hardness, Alkalinity, Sodium, Biochemical Oxygen Demand, Nitrate and Nitrite). The relative weight assigned to each parameter ranged from 1 to 4 based on the importance of the parameter for aquatic life. The results indicated that water quality of Dokan Lake declined from Good in the years 1978, 1979, 1980, 1999, 2000 and 2008 to Poor in 2009. The impact of various anthropogenic activities was evident on some parameters such as the EC and BOD. It is suggested that monitoring of the lake is necessary for proper management. Application of the WQI is also suggested as a very helpful tool that enables the public and decision makers to evaluate water quality of lakes in Iraq.
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