Islamic Azad University at Shoshtar
Shushtar, Iran
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Boveiri H.R.,Islamic Azad University at Shoshtar
Frontiers of Information Technology and Electronic Engineering | Year: 2017

Optimized task scheduling is one of the most important challenges to achieve high performance in multiprocessor environments such as parallel and distributed systems. Most introduced task-scheduling algorithms are based on the so-called list scheduling technique. The basic idea behind list scheduling is to prepare a sequence of nodes in the form of a list for scheduling by assigning them some priority measurements, and then repeatedly removing the node with the highest priority from the list and allocating it to the processor providing the earliest start time (EST). Therefore, it can be inferred that the makespans obtained are dominated by two major factors: (1) which order of tasks should be selected (sequence subproblem); (2) how the selected order should be assigned to the processors (assignment subproblem). A number of good approaches for overcoming the task sequence dilemma have been proposed in the literature, while the task assignment problem has not been studied much. The results of this study prove that assigning tasks to the processors using the traditional EST method is not optimum; in addition, a novel approach based on the ant colony optimization algorithm is introduced, which can find far better solutions. © 2017, Journal of Zhejiang University Science Editorial Office and Springer-Verlag Berlin Heidelberg.

Baharizadeh M.,Islamic Azad University at Shoshtar
Pakistan Veterinary Journal | Year: 2012

Buffalo milk yield records were obtained from monthly records of the Animal Breeding Organization of Iran from 1992 to 2009 in 33 herds raised in the Khuzestan province. Variance components, heritability and repeatability were estimated for milk yield, fat yield, fat percentage, protein yield and protein percentage. These estimates were carried out through single trait animal model using DFREML program. Herd-year-season was considered as fixed effect in the model. For milk production traits, age at calving was fitted as a covariate. The additive genetic and permanent environmental effects were also included in the model. The mean values (±SD) for milk yield, fat yield, fat percentage, protein yield and protein percentage were 2285.08±762.47 kg, 144.35±54.86 kg, 6.25±0.90%, 97.30±26.73 kg and 4.19±0.27%, respectively. The heritability (±SE) of milk yield, fat yield, fat percentage, protein yield and protein percentage were 0.093±0.08, 0.054±0.06, 0.043±0.05, 0.093±0.16 and zero, respectively. These estimates for repeatability were 0.272, 0.132, 0.043, 0.674 and 0.0002, respectively. Lower values of genetic parameter estimates require more data and reliable pedigree records. ©2012 PVJ.

Remobilization and transfer of the stored food in vegetative tissues to the grains in monocarpic plants require the initiation of whole plant senescence. However, mechanisms by which plant senescence promotes remobilization of assimilates are rather obscure. This study examined the relationship between the senescence induced by water deficits and C remobilization during grain filling. Two wheat cultivars (Triticum aestivum L.), Marvdasht and Zagros (sensitive and tolerant to terminal season drought, respectively) grown at a day:night temperature of 22:15°C from anthesis were held as well watered controls (field capacity), or subject to water deficit (50% FC) imposed either from anthesis to 14 days later (WS1) or from 14 days after anthesis to maturity (WS2). Relative water content, photosynthetic activity, chlorophyll content, soluble proteins of flag leaves, level of hexose sugars, sucrose and fructans in the peduncle (enclosed by the flag leaf sheath) and the penultimate internode and grain yield assessed. Results showed that water deficits enhanced the senescence by accelerating loss of leaf chlorophyll and soluble proteins and the loss was more under WS2 than WS1. The net CO2 assimilation rate (PN) in flag leaves during water deficit display a strict correlation with the drought sensitivity of the genotypes and showed an early reduction in Marvdasht. Water stress, both at WS1 and WS2, facilitated the reduction in concentration of total soluble sugars and fructans in the internodes but increased the sucrose level there, promoted the re-allocation of pre-stored C from the peduncle and penultimate to grains. There was an increase in internodes fructose and a fall in fructan level that preceded the loss of dry matter associated with water stress. WS2 resulted in more deleterious effect on grain yield than WS1 in both cultivars and led to a smaller kernels and lesser aerial biomass at maturity. The loss was more in Marvdasht than Zagros. Our results suggest that the senescence and remobilization promoted by water deficits during grain filling are coupled processes in wheat and mass of soluble sugars in the stems is premier than sugar remobilization efficiency. Varietal differences in the extent of such trait existed. It would be advantageous to select genotypes with greater capacity to do this under water deficit conditions. ©2011 Academic Journals.

Kahyaei A.,Islamic Azad University at Shoshtar
Research Journal of Applied Sciences, Engineering and Technology | Year: 2011

This research studies the effect of location of Unified Power Flow Controller (UPFC) on power system. In this study the several case studies including various points for installing UPFC on power system are considered and results of profile of voltage at all of buses of system is obtained. The active and reactive of all transmission lines of power system following installing UPFC at various points of system is discussed and results are analyzed. The encouragement to the construction of HV lines, the amount of power transmission/km on HV line and the amount of power transaction as seen from economic side is much responsible for concern towards congestion in power system. The solution is the use of FACTS devices especially the use of UPFC. In this research the study of UPFC with its various candied locations for installing on power system is understood. Second, the operation of control system used in its converters is also studied. Finally by help of modeling of a power system in MATLAB/SIMULINK, and by installing UPFC in transmission link, its use as power flow controller and voltage injection is seen. Conclusion is made on different results to see the benefit of UPFC in power system. © 2011 Maxwell Scientific Organization.

Moeinifar S.,Islamic Azad University at Shoshtar | Kokabi A.H.,Sharif University of Technology | Hosseini H.R.M.,Sharif University of Technology
Journal of Materials Processing Technology | Year: 2011

The influence of thermal cycles on the properties of the coarse grained heat affected zone in X80 microalloyed steel has been investigated. The thermal simulated involved heating the X80 steel specimens to the peak temperature of 1400 °C, with different cooling rates. The four-wire tandem submerged arc welding process, with different heat input values, was used to generate a welded microstructure. The martensite/austenite constituent appeared in the microstructure of the heat affected zone region for all the specimens along the prior-austenite grain boundaries and between the bainitic ferrite laths. The blocky-like and stringer martensite/austenite morphology were observed in the heat affected zone region. The fractional area of M/A particles due to different cooling rate was the main factor in increasing of the hardness values in the coarse grained heat affected zone. The Charpy absorbed energy of specimens was assessed using Charpy impact testing at -50 °C. The martensite/austenite constituent's size such as mean diameter and length are important factors influencing Charpy impact properties of coarse grained heat affected zone. The micro crack nucleation may occur from M/A particles at the intersection of prior-austenite grain boundaries. Similar crack initiation sites and growth mechanism were investigated for specimens welded with different heat input values. © 2010 Elsevier B.V. All rights reserved.

Alibeygi Beni A.,Islamic Azad University at Shoshtar | Alibeygi Beni A.,National Iranian Oil Company | Malekzadeh P.,Persian Gulf University
Composite Structures | Year: 2012

The free vibration of orthotropic non-prismatic skew nanoplate based on the first-order shear deformation theory (FSDT) in conjunction with Eringen's nonlocal elasticity theory is presented. As a simple, accurate and low computational effort numerical method, the differential quadrature method (DQM) is employed to solve the related differential equations. For this purpose, after deriving the equations of motion and the related boundary conditions, they are transformed from skewed physical domain to rectangular computational domain of DQM and accordingly discretized. After validating the formulation and method of solution, the effects of nonlocal parameter in combination with geometrical parameters and boundary conditions on the natural frequencies of the orthotropic skew nanoplates are investigated. © 2012 Elsevier Ltd.

Saeedipour S.,Islamic Azad University at Shoshtar
Proceedings of the National Academy of Sciences India Section B - Biological Sciences | Year: 2013

The present work investigated the effects of endogenous abscisic acid (ABA) and proline contents related to yield in two wheat (Triticum aestivum L.) cultivars, Marvdasht and Zagros, sensitive and tolerant to terminal season drought, respectively, grown in pots under well watered and water-stressed condition starting from anthesis until maturity. Water stress resulted in marked increase in the ABA content of both cultivars. However, the absolute of ABA concentration in tolerant cultivar was more than that of sensitive cultivars. Water stress caused to elevate the leaf proline content of the drought-tolerant that, seemingly led to alleviate the deleterious effect of water stress whereas, a slight increment in proline levels was observed at the end of grain development in drought sensitive cv. The effect of drought on grain yield was primarily due to the significant reduction in grain weight, particularly in drought-sensitive cultivars. The protective effect of both ABA and proline was more pronounced in Zagros cv. that exhibited higher grain yield under water deficit conditions. © 2012 The National Academy of Sciences, India.

The influence of the real and simulated thermal cycles with different secondary peak temperatures on the properties of the reheated coarse grained heat affected zone (CGHAZ) in the X80 microalloyed steel has been investigated. The four wires tandem submerged arc welding process with different heat input values was used to generate real double passes thermal cycles. The simulated thermal cycles involved heating to the first peak temperature (TP1) of 1400 °C and then reheating to different secondary peak temperatures (TP2) of 700, 800 and 900 °C with cooling rates of 3.75 and 2 °C/s. The toughness of the simulated reheated CGHAZ with different peak temperature was assessed using Charpy impact testing at 0 °C and -50 °C. It is clear that the reheated CGHAZ thermal cycles with different second peak temperatures have a significant effect on morphology of the martensite/austenite (M/A) constituent. The blocky and connected M/A constituent along the prior-austenite grain boundaries as a brittle phase for crack initiation. The Charpy impact results indicated that intercritically reheated coarse grained heat affected zone had less absorbed energy with higher transition temperature and hardness. In the same prior-austenite grain size, cycles 2 and 4 with lower cooling rate (2 °C/s) have larger size of M/A constituents. The M/A constituent size such as mean diameter and length are important factors influencing Charpy impact properties of the simulated reheated CGHAZ.

Ommani A.R.,Islamic Azad University at Shoshtar
African Journal of Agricultural Research | Year: 2011

Optimum use of energy is very vital for agricultural productions section. The purpose of this research is to determine the productivity of energy consumption in corn farms of Ahwaz Township, Khouzestan Province, Iran. Linear programming was used for calculating the productivity of energy consumption, in that the mathematical technique of linear programming is instrumental in solving a wide range of operations management problems. Linear programming models consist of an objective function and constraint functions. In this research, energy productivity (EP) served as the objective function. By using Lingo software, all the analyses were conducted. Based on the results of the research, the consumption of energy in different sections such as machines, seed, irrigation, human resources and fertilizer was higher than the optimal level. © 2011 Academic Journals.

Khodarahmpour Z.,Islamic Azad University at Shoshtar
African Journal of Agricultural Research | Year: 2011

This study was carried out in order to investigate the genetic structure of the twenty-eight maize hybrids established from eight maize inbred lines. The seed of the F1 population along with their parents were planted in Iran in 2008, using RCBD with three replications. Estimation of gene effects and some of the genetic parameters and graphic plot drawing of Hayman-Jinks method were accomplished. Statistics a and b for all traits was significant. Considering the average degree of dominance, as well as the Hayman graphical plot, dominance effects were observed for grain yield and plant growth period traits over dominance, complete dominance for grain diameter and additive gene action with partial dominance for ASI, grain filling period, grain number in row, grain number in ear, grain row number in ear, ear diameter, grain depth, 1000 grain weight and hektolitr weight traits. © 2011 Academic Journals.

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