Thi Qar University is an Iraqi university located in Nasiriyah, Iraq. It was established in 2000. Originally, the university was a branch of the University of Basrah, and the branch was established in 1992. Its first graduating class was in 1996. In 2000, the branch became independent of Basrah University and Thi Qar University was founded. Wikipedia.
Abeed Al Mashkor I.M.,University of Thi-Qar
International Journal of Pharmacognosy and Phytochemical Research | Year: 2014
Fenugreek (Trigonella foenum-graecum) is a nutrient dense food rich in beneficial phytochemicals. In this study, three types of solvent extracts of fenugreek seeds were used to examine the effects of extraction solvent on total phenolics content (TPC), 1,1-diphenyl-2-picryl hydrazyl radical scavenging (DPPH) and ferric reducing antioxidant power (FRAP) were determined. Results showed that extraction solvent had significant effects on TPC and antioxidant activity of acetone extract. The highest content of TPC and antioxidant activity (FRAP and DPPH) were found in 50% acetone extracts. The TPC for fenugreek seeds from 25.90 to 15.45 mg GAE/100 g DW and antioxidant activity FRAP from 47.49 to 31.85 mg TE /100 g DW, DPPH were from 67.30 % to 43.61%). The largest amount of total phenol content which leads to more effective radical scavenging effect was shown by 50% acetone extract. Moreover, amount of phenolic compounds and antioxidant activities increased in acetone extract. Acetone 50% and methanol 50% solvent showed the greatest capability in extracting antioxidants and inhibiting the free radicals produced. It was concluded that extraction solvent play important roles on the phenolics compounds and their antioxidant activity of fenugreek seeds extract. © 2014–2015, International Journal of Pharmacognosy and Phytochemical Research. All rights reserved.
Hasan M.I.,University of Thi-Qar
Applied Thermal Engineering | Year: 2011
The aim of this paper is to study the flow and heat transfer of microencapsulated phase change material (MEPCM) suspension in counter flow microchannel heat exchanger (CFMCHE) and it's effect of the performance of this heat exchanger when using this suspension as a coolant instead of pure fluid. The hydrodynamic and thermal characteristics of this suspension flows in microchannels of CFMCHE is numerically investigated. The MEPCM suspension used in this paper consists of microcapsules constructed from n-octadecane as a phase change material (PCM) and the shell material is polymethylmethacrylate, these capsules are suspended in water in a concentration of (0-20)%. From the results, using of MEPCM suspensions as a cooling fluid lead to modify thermal performance of a CFMCHE by increasing its effectiveness but it also lead to increase the pressure drop. From heat transfer (thermal performance) point of view it is better to use this type of fluid to increase cooling efficiency of a CFMCHE, but due to extra increase in pressure drop it leads to reduce the overall performance compared with pure fluids. Therefore its use depends on the application at which this heat exchanger is used. © 2010 Elsevier Ltd. All rights reserved.
Togun H.,University of Thi-Qar
International Communications in Heat and Mass Transfer | Year: 2016
Heat transfer in flow channels can be improved by using passive techniques such as ribs on wall and change cross section area where these modifications have practical engineering application for thermal power plant, refrigerators, and radiators. Effects of separation flow and nanofluids on thermal performance for laminar range presented experimentally and numerically in this review. The augmentations of heat transfer with fluid and nanofluid flow through sudden expansion, over backward and forward facing step, and rib channels have been concerned. The experimental results showed good agreement with numerical results and indicated the effects of separation flow and nanoparticles on augmentation of heat transfer rate. The results showed increase in Nusselt number with increase of Reynolds number, step height, and number of ribs. It was detected that by increasing the nanoparticle volume concentrations of nanofluids, improves the heat transfer coefficient. Also different nanoparticles used in the literature investigations are based on thermal conductivity where enhancement of heat transfer rate was obtained significantly. © 2016 Elsevier Ltd
Mohamad H.K.,University of Thi-Qar |
Mohamad H.K.,Voronezh State University
Journal of Magnetism and Magnetic Materials | Year: 2011
I studied the ferrimagnetic Ising model with nearest neighbour interactions for a square lattice and simple cubic one, using mean field theory. The free energy of a mixed spin Ising ferrimagnetic model was calculated from a mean field approximation of the Hamiltonian. By minimizing the free energy, I obtained the equilibrium magnetizations and the compensation temperatures. Clear indications of the single-ion anisotropies on the compensation points of the mixed spin-3/2 and spin-5/2 ferrimagnetic lattices are found. Some interesting behaviors of these systems are obtained depending not only on the values of magnetic anisotropies for both sublattice sites but also on the lattice structure. The longitudinal magnetic fields dependence of the spin compensation temperature is the main focus of research. The possibility of many compensation temperatures is indicated. © 2010 Elsevier B.V. All rights reserved.
Al-Nashy B.,University of Basrah |
Al-Nashy B.,Missan University |
Amin S.M.M.,University of Basrah |
Al-Khursan A.H.,University of Thi-Qar
Journal of the Optical Society of America B: Optical Physics | Year: 2014
We have introduced a Y-configuration model from the double-quantum-dot (QD) system to study third-order Kerr nonlinearity based on the density-matrix method. Inhomogeneity in QDs has been included in the calculations of the real (Kerr) and imaginary (absorption) parts of the density matrix, which has not been covered in the earlier Kerr calculations. Our system exhibits high controllability with a single parameter. Giant Kerr dispersion, propagation without distortion, wide electromagnetic-induced transparency, and switching between subluminal to superluminal propagation are obtained by tuning its fields. Controlling and cycling fields can also control the system in addition to the pump field. © 2014 Optical Society of America.