Nowruzpour Mehrian S.M.,University of Tehran |
Naei M.H.,University of Tehran |
Mehrian S.Z.,Yasuj University
Applied Mechanics and Materials | Year: 2013
Thermal shock describes the way that a material exposed to a sudden change in temperature. These conditions usually take place in aerospace industry, when aircraft encounter the atmosphere layers. It also happens in combustion chamber of engines when mixture of fuel and air ignite in cylinder. Classical thermoelasticity is not capable to analyze such a problem. Therefore, generalized coupled thermoelasticity theories arose. In this article, the dynamic coupled thermoelastic response of a rectangular plate made of functionally graded material subjected to a thermal shock based on Lord-Shulman theory is studied. Using state space approach, the state equations of the problem are obtained. The plate's boundary condition is simply support on the edges and the variation of mechanical properties is assumed to change along the thickness of the plate. The Laplace transform is applied to transform governing equations from time domain to the Laplace domain. Then by using a numerical method, the equations are solved and the results are inversed to the time domain displacement and temperature field are acquired. Results are presented for different power law indices and they are validated by previous reported literature. © (2013) Trans Tech Publications, Switzerland.
Hekmatzadeh S.F.,Yasuj University of Medical Sciences |
Bazarganipour F.,Hormozgan University of Medical Sciences |
Malekzadeh J.,Yasuj University |
Goodarzi F.,Yasuj University |
Aramesh S.,Yasuj University
Complementary Therapies in Medicine | Year: 2014
Objective: This study aimed to test the effects of boiled Anethum Graveolens seeds on pain intensity and duration of labor stages. Methods: A randomized clinical trial was conducted on 153 eligible participants who had regular uterine contractions. Participants were allocated to either intervention or control group receiving boiled Anethum Graveolens seeds or routine care, respectively. Preparation of Anethum Graveolens boiled solution was as follows: 10. g (two tablespoons) of seed in 100. cc water boiled for 10. min. After filtration, this solution used by intervention group only once after starting active phase (3-4. cm of cervix dilatation). Participants were followed up to the delivery time. Data were analyzed using T, and Chi square tests. Results: Findings showed that the length of the all stages of labor were significantly lower in intervention compared to control group in except for second stage in primiparous. The second stage of labor in primiparous participants in intervention group was shorter than control group, although the difference is not significant. Moreover, intervention group had a significantly better dilatation and effacement scores after 1, 2, 3 and 4. h following the intervention compared to control group. Conclusion: Results supported the boiled Anethum Graveolens seeds as an effective way to progress of the labor. © 2014 Elsevier Ltd.
Ghaedi M.,Yasouj University |
Jaberi S.Y.S.,Yasouj University |
Hajati S.,Yasuj University |
Montazerozohori M.,Yasouj University |
And 2 more authors.
IEEE Sensors Journal | Year: 2015
A novel carbon paste electrode (CPE) based on 2,2-(ethane 1,2-diylbis (azanylylidene)) bis (ethan-1-yl-1-ylidene)) diphenol (L) was prepared for selective determination of trace amount of Pb2+ ion. The effects of individual variables, such as amounts of L, sodium tetraphenylborate (NaTPB), graphite powder, and Nujol as well as their possible interactions were investigated and optimized using central composite design under response surface methodology. Optimum composition of carbon paste was set as 100-mg Nujol and the mass (milligram) ratio of 209/4/6 for graphite powder: NaTPB: carrier, respectively. Such composition was found to be led to significant enhancement in the selectivity and sensitivity of the CPE toward Pb2+ ions over a wide concentration range of 3.7 × 10-7-1 × 10-2 mol L-1 with detection limit of 1.5 × 10-7 mol L-1 and a Nernstian slope of 30.7±1.56 mV/decade of Pb2+ concentration. Negligible significant change in response was seen over wide pH range of 4-6 with response time lower than 14 s. The good selectivity of the CPE for Pb2+ ion toward other metal ions was confirmed by the potentiometric selectivity coefficients. Finally, to be practical, these electrodes were accurately and repeatability used for the determination of Pb2+ ions in real water sample. © 2015 IEEE.
Mohammadzadeh A.,University of Mazandaran |
Samadi-Maybodi A.,University of Mazandaran |
Khodadoust S.,Yasuj University
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy | Year: 2013
(Figure Presented) Quercus brantii acorn is rich of some useful mineral elements such as K, Fe and Zn. The content of these mineral elements in Quercus are dependent on their region and environmental conditions. Q. brantii grown naturally in different regions of Iran especially in Kohgiloye va Boyer Ahmad province (southwestern of Iran). In this study total concentration of Fe, Zn and K elements were determined using atomic absorption and emission spectroscopy in fruits, leaves of Q. brantii and also in the soils where this plant was grown. Statistical evaluation (ANOVA test) was employed for all measurements. Results confirmed that the concentration of elements in fruit and leave depended on area which the plant is growth. The transport factor of elements was also considered. © 2013 Elsevier B.V. All rights reserved.
Yoosefian M.,Kerman Graduate University of Technology |
Chermahini Z.J.,Yasuj University |
Raissi H.,Birjand University |
Mola A.,Kerman Medical University |
Sadeghi M.,Institute for Advanced Studies in Basic Sciences
Journal of Molecular Liquids | Year: 2015
The results of a detailed DFT (B3LYP) and ab initio (HF and MP2) investigation on one of the amino-imino tautomers and its derivatives are presented here. The energy, geometrical parameters and vibrational frequencies of 2-amino-1,3,4-thiadiazole tautomerization in the gas phase, water, THF and DMSO solutions were calculated using 6-311++G(d,p), 6-311G(d) and 6-31+G(d,p) basis sets. The solvent effect was explored using the PCM method and the related conformers have been fully optimized at the B3LYP/6-311++G∗∗ level of theory. For the investigated molecule, proton-transfer from N to N and from N to C occurred, which leads to three tautomers: 2-amino-1,3,4-thiadiazole (A), 2(3H)-imino-1,3,4-thiadiazole (B) and 2(5H)-imino-1,3,4-thiadiazole (C). For B and C, geometrical isomerism (E and Z) was also considered. This leads to five isomers: A, B1, B2, C1 and C2 for each derivative. However, all calculations evidently show that isomer A strongly or solely dominates and dictates the structure of 2-amino-1,3,4-thiadiazoles. Substituents and solvents have no effect on the tautomeric preferences. ©2014 Elsevier B.V. All rights reserved.
Rabani S.M.,Yasuj University of Medical Sciences |
Moosavizadeh A.,Yasuj University
Nephro-Urology Monthly | Year: 2012
Background: A review of the related medical journals indicates that there is no definite evidence- based option for managing large proximal ureteral stones, although many procedures such as transureteral lithotripsy (TUL), shock wave lithotripsy (SWL), percutaneous nephrolithotripsy, laparoscopic ureterolithotomy, and open ureterolithotomy are currently used to treat this urological problem. Objectives: In this study, we tried to determine the most appropriate treatment plan for proximal ureteral stones larger than 12 mm by comparing the two most commonly used procedures. Patients and Methods: Between February 2005 and April 2011, 62 patients including 40 males and 22 females (mean age 39.5 years, range 19 to 64) with proximal ureteral stones larger than 12 mm (12-26 mm) with a mean size of 17.64 mm were prospectively divided into two groups consisting of 32 patients who underwent TUL (group A) and 30 who underwent SWl (group B). In unsuccessful cases, repeat SWl or TUL was planned. Patients who could not tolerate the lithotomy position, younger than 18 years, had undergone coagulopathy, had concurrent renal and ureteral stones, were pregnant, or had sepsis were excluded from this study. Results: Stone access was successful in 28 patients and the treatment was efficient in 18 patients (56.25%) in group A. For the patients with successful stone access but unsuccessful TUL, a DJ was inserted and a second ureteroscopic intervention was performed. The second intervention was successful in 7 patients (21.87). SWl was successful in 14 patients (46.66%) in the first attempt and in 7 additional patients in the second intervention (23.33%). Conclusions: In this study, we showed different success rates for SWl and TUl because of the larger size of the stones. We achieved a success rate of 56.25% in the first attempt in the TUl group, and the overall success rate (after the second TUL) was 78.12%. In comparison, the SWL group had a success rate of 46.66% in the first attempt, and the overall success rate (after the second SWL) was 69.96%. © 2012 Kowsar Corp. All rights reserved.
Hashempour M.,Iran University of Science and Technology |
Razavizadeh H.,Iran University of Science and Technology |
Rezaie H.-R.,Iran University of Science and Technology |
Hashempour M.,Yasuj University |
Ardestani M.,Iran University of Science and Technology
Materials Chemistry and Physics | Year: 2010
W-25%Cu composite powder was produced via thermochemical procedure. Copper nitrate and sodium tungstate salts were used as Cu and W containing precursors, respectively. Aqueous solutions of these salts were reacted under several different pH conditions. It was found that the products of all stages involving Cu2WO4(OH)2 and CuWO4·2H2O as raw precipitates, CuWO4-x, CuO, and WO3 as calcined powders, and W-Cu reduced composite powders possessed similar compositions in different pH conditions. But changing the reaction pH in the range of 3-13 was found to markedly influence the microstructure of the products. At low and medium pH precipitates were in the form of large monolithic agglomerates while in high pH smaller cotton like agglomerates were formed. At low and medium pH conditions simple ion replacement was found to be dominant mechanism of precipitation while in high pH Cu(NH3)4 2+ complex ion was formed and ligand exchange was the dominant mechanism of precipitation. © 2009 Elsevier B.V. All rights reserved.
Asadi M.,Shiraz University |
Setoodeh Khah M.,Shiraz University |
Kianfar A.H.,Yasuj University
Journal of the Iranian Chemical Society | Year: 2010
The electronic and steric effects of some Schiff bases and the solvent on the thermodynamic parameters of the pentacoordinate Co(III) Schiff base complexes were studied. The formation constants and the thermodynamic parameters were measured spectrophotometrically for 1:1 adduct formation of the complexes as acceptors with tributylphosphine (PBu3) as donor, in some solvents (acetonitrile, tetrahydrofuran, butanol, ethanol and N,N-dimethylformamide) in constant ionic strength (I = 0.01 M, sodium perchlorate) and at various temperatures. The trend of the reactivity of the pentacoordinate cobalt(III) Schiff base complexes toward tributylphosphine according to the solvent is as follows: acetonitrile > tetrahydrofuran > butanol > ethanol > N,N-dimethylformamide. The trend of the reactivity of pentacoordinate cobalt(III) Schiff base complexes toward the donor in a given solvent according to the equatorial Schiff base is as follows: BBE > BAE > Salen.
Malekzadeh P.,Persian Gulf University |
Bahranifard F.,Yasuj University |
Ziaee S.,Yasuj University
Composite Structures | Year: 2013
The free vibration analysis of functionally graded (FG) cylindrical panels with a cut-out and under thermal environment is studied using the three-dimensional Chebyshev-Ritz method. The material properties are assumed to be temperature-dependent and graded in the thickness direction. The formulation is based on the elasticity theory, which includes the effects of initial thermal stresses induced by the thermal environment. Chebyshev polynomials in conjunction with suitable boundary functions are used as admissible functions of the Ritz method. The convergence behavior of the method is demonstrated and to validate the results, comparisons are made with the available solutions for isotropic homogeneous and FG curved panels without cut-out. In addition, the solution for homogeneous panels with cut-out are compared with those obtained via the commercial finite element package 'ABAQUS'. Then, the effects of volume fraction index, different types of temperature distributions through the panel thickness, dimensions of the cut-out and the geometrical parameters of the panels on their free vibration behaviors are studied. © 2013 Elsevier Ltd.
Mosallanezhad M.,Shiraz University |
Bazyar M.H.,Yasuj University |
Saboor M.H.,Yasuj University
Measurement: Journal of the International Measurement Confederation | Year: 2015
In this research, a novel reinforcing element is introduced. It includes a series of extra elements (anchors) that are attached to conventional steel strips. The new elements increase the pull-out resistance of the reinforcements and reduce the anchorage length. A total of 55 pull-out tests were performed to evaluate the pull-out resistance and optimum geometry of the new system. The effect of the anchor's angle, length and spacing, as well as the influence of the dimensions of the cubic anchors on the coefficient of interaction ratio (CIRp) were investigated. The coefficient of interaction ratio directly affects the pull-out capacity - the number of anchors on the anchorage length. As a result, the pull-out resistance increased significantly with the addition of new anchors to the conventional reinforced strip. Test results indicated that the use of strip anchors increased the ultimate pull-out resistance under surcharge pressures of 50, 100, 120 and 150 kPa by factors of 7.4, 4.95, 4.3 and 4.3, respectively, in comparison with conventional strips. The finite element method (FEM) was also used to compare and verify the results of the experimental pull-out. It was observed that the results of the FEM were in good agreement with the laboratory test results. © 2014 Elsevier Ltd. All rights reserved.