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Certainly the fair rewarding between personnel based on their productivity and performance which could motivate the employee and increase productivity of organization is one of the most important matters for managers. Obviously, allocating rewards and bonuses that result from productivity or other which has been defined from management should be justly and based on people effectiveness and efficiency. The purpose of this research is designing a productivity model for allocating bonuses through determining the productivity and performance indexes and then measuring and also analyzing, as well as allocating rewards and bonuses among employees based on their own productivity and performance. This is an applied research, uses descriptive statistics and the data are collected from random stratified sampling in Niro Mohareke Company.  Finally, the model which is confirmed and validated by experts and managers of Niro Mohareke Company, is used as a practical example in the Strategic dep.

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Emulsion consists of drops of one liquid dispersed into another immiscible liquid, is a novel technique for producing monodisperse droplets. The aim of this research is using the Lattice Boltzmann Method (LBM) to simulate two-phase flows in micro-channels to access the emulsification process. To this approach, The Index-Function Model proposed by He, is used to simulate drop formation in emulsification process in a co-flowing micro-channel with a complex geometry and three inlets. The simulation is performed to investigate the mechanism of drop generation due to dripping and jetting modes and the mode between them. Index function model, which is a new reliable model to evaluate two-phase flows, is applied to track the motion and deformation of the interface between the two immiscible fluids. Accuracy of our results is examined by two well-known basic analytical models including Relaxation of a rectangular drop and coalescence of two static droplets. Our results indicate good agreements with analytical data. The dimensionless numbers such as Capillary and Velocity ratio were used. The Capillary number is one of the most important dimensionless numbers in determination of fluid flow characteristics in micro-channels. The simulations reproduce dripping, widening jetting and narrowing jetting simultaneously in a coflowing microchannel in agreement with the experimental ones. This indicates that index function LBM model has a good accuracy and high stability to simulate this kind of flow.

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In this paper, natural convective heat transfer of nanofluids in a uniform magnetic field between the square cavity and inner cylinder, was simulated via Lattice Boltzmann Method. The inner cylinder in square shape, diamond, and circular has been examined. Square cavity walls and inner cylinder surfaces are at a constant cold and warm temperature, respectively. The flow, temperature, and magnetic field is calculated with solving flow, temperature, and magnetic distribution functions simultaneously. D2Q9 lattice arrangement for each distribution function is used. The results clearly show the behavior of fluid flow and heat transfer between the cavity and the cylinder. The results have been validated with available valid results showing relatively good agreement. The effects of Rayleigh number, Hartmann number, void fraction and type of nanoparticles on natural convective heat transfer are investigated. This study shows that for all three geometries used with the same void fraction, type of nanofluid, and Rayleigh number, natural convective heat transfer decreases with Hartmann number. Also, when Hartmann number was had fixed, natural convective heat transferwas increased with Rayleigh number. Thus, to select the right geometry for optimum natural convective heat transfer, our needs to pay special attention to Hartmann and Rayleigh numbers. In addition, viod fraction and type of nanofulid can affect heat transfer directly.

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In aircrafts with multiple wings, control surfaces, and stabilizers, the stabilizing fins located at the tail provide stability for the boosting. In such aircrafts, the vortices resulting from the flow around upstream wings and control surfaces usually weaken the stabilizers’ performance. The nature of the form of grid fins makes them less sensitive in comparison with planar fins. Accordingly, the performance can be improved by substituting grid fins for planar fins. This paper simulates the flow field around the different models of planar and grid fins by applying finite volume methods using hybrid grid near the airplane’s body. At first, the flow field around a model with available experimental results was simulated to achieve the appropriate model of turbulence model. Then, two set of planar stabilizers, i.e. PL1 and PL2 and one set of grid stabilizers were designed for an aircraft with wings and control surfaces in a way that aerodynamic coefficients of the fins are equal to each other. However, they demonstrate different aerodynamic coefficients when installed on the aircraft as stabilizers. The simulation was run at Mach numbers 0.6, 0.7, and 0.8 and attack angles 0, 2, 4, and 6 degrees. The results indicate that pitch moments and normal force coefficients of the planar fin are lower than the grid fin in both models. Moreover, the performance of the planar fin as a stabilizer will be improved if its chord’s length is decreased and its span is increased.

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In current research, surface reaction phenomena in several packed bed reactors have been considered. Flow field through several fractal Sierpinski carpet porous media have been simulated by LBM. The endothermic Isopropanol dehydrogenization reaction has been considered as basic reaction mechanism and two major parameters of non-homogeneity and specific area in catalytic surface reaction have been investigated. To validate our numerical method, the obtained results have been compared to a recent benchmark study and adopted very well. Also, in both cases the porosity factor retained constant (ε=0.79). The results shown that, by three times increase in specific area, the reactant conversion rate is increased significantly (approximately one order of magnitude), and the pressure drop increased (nearly 5 times), too. Also, to consider non-homogeneity arrangement, the particle arrangements from small to large and large to small have been considered. In both, the pressure drop is approximately the same. At low Re, reactant conversion of both arrangement are the same but by increasing of Re, the packed bed reactor with large to small arrangement has a little more reactant conversion.

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There are some factors that can pose limit before the performance of obligations and cause obligation to be changed or terminated at all. These factors can have legal or voluntary origins, each of which can be explicit or implicit. Among the factors of administrative origin are the conditions of construction or collusion that can change the obligation. The parties to the obligation in this condition agree to the obligation before or during the contract and make the obligation based on it. The masonry condition without an obligatory statement can be based on the implicit will to change the limits and this can be either increasing or decreasing the obligation and is applicable in property and related rights of individuals and can be an obligation committed to the development and/ or reduce and finally, if not committed to it, could cause the termination or invalidity of the obligation by the parties.