Showing papers in "Scientia Iranica in 2009"

TL;DR: An algorithm is applied to three test distribution systems and results indicated that, if the DGs are located at their optimal locations and have optimal sizes, the total losses in the distribution network will be reduced by nearly 85%.

TL;DR: The purpose of this paper is to minimize the total cost of this problem by determining the optimal values of activity duration, activity time and the material ordering schedule subject to constraints by employing a genetic algorithm approach.

TL;DR: In this paper, the importance of specific level of supply chain integrations and its effects on two product features are examined, i.e., product innovation and product quality, and the results imply that comparing to internal and supply chain downstream integrations supply chain upstream integration has a higher impact on product quality.

TL;DR: In this article, the linear dynamic response of uniform beams with different boundary conditions excited by a moving load based on the Euler-Bernouli beam theory was presented. But the linear response was not considered in this paper.

TL;DR: In this paper, an adaptive neuro fuzzy inference system (ANFIS) is employed to approximate the nonlinear analysis of the structures instead of performing a time consuming finite element analysis (FEA).

TL;DR: In this paper, the authors investigated the impact of wake and skew angle on the performance of a ship propeller, based on the potential boundary element method (BEM) for two propeller types; a conventional propeller and a highly skewed propeller.

TL;DR: In this article, a cumulative damage model based on a Markov process is applied to model the deterioration of the track and probabilistic dynamic programming is used to determine the optimal repair for each possible track state in the planning horizon.

TL;DR: In this paper, a mathematical model is developed to investigate the nonisothermal reduction of the hematite pellet with Syngas, namely is a mixture of hydrogen, water vapour, carbon dioxide and carbon======monoxide gases.

TL;DR: In this paper, the results show that the ANN model outperformed the SDSM model for long lead rainfall prediction in a study area in the south-east part of Iran.

TL;DR: In this paper, several steel moment frames have been considered and their responses have been evaluated under a set of scaled earthquakes and a group of various damage indexes, which included cumulative and non cumulative, cyclic fatigue based, deformation based and modal parameter based, has been considered.

TL;DR: The results indicate the ability of the proposed formulation and, in particular, the third formulation to optimally solve reservoir operation problems.

TL;DR: In this paper, an analysis of the harmonic contents of the optical output power of a single-plane single-mode laser diode is performed, and the results are described in detail.

TL;DR: In this paper, an ANN model was used to predict the density and compressive strength of concrete mixtures with a total of 600 specimens and a total number of 600 pairs were selected.

TL;DR: In this article, a third-generation spectral model called SWAN has been evaluated in the prediction of wave parameters and the results show that in the investigated case, the average scatter index of SWAN is about 19 percent for signi¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯cant wave height and 23 percent for peak period.

TL;DR: In this article, a model is developed to optimize a water resources allocation scheme considering the conjunctive use of surface and groundwater resources, as well as determining a suitable crop pattern.

TL;DR: In this article, the authors investigate the behavior of high strength reinforced concrete beams strengthened with fiber reinforced plastic (FRP) sheets, and investigate the change in the strength and ductility of the beams as the number of FRP layers and tensile reinforcement bar ratios are changed.

TL;DR: In this article, a new systematic method for deriving the dynamic equations of motion for impossible robotic manipulators is developed by using the Gibbs-Appell assumed modes method, where all dynamic expressions of a link are expressed in the same link local coordinate system.

TL;DR: In this paper, the central composite design (CCD) technique, a response surface methodology (RSM), was used to study the effect of the withering time and the fermentation conditions of the tea leaves on the black tea quality parameters.

TL;DR: By using the NIMR model, the MR damper force can be commanded to follow closely the desirable optimal control force and achieves better performance than active LQG and COC system.

TL;DR: In this paper, the solidification/stabilization of heavy metal contaminated soils using Ordinary Pontlandite Cement (OPC) is studied as a hazardous waste treatment technology.

TL;DR: In this paper, the changes in the rate of nucleation, entropy, pressure and other parameters of the two-phase mixture, subjected to spraying the liquid droplets close to the nozzle's throat, are investigated.

TL;DR: In this paper, the cavitation phenomenon is predicted numerically on a two-dimensional hydrofoil, NACA0015, as well as propeller models A and B. The results show good agreement in comparison with available experimental data.

TL;DR: In this article, a v2f model is employed to conduct a series of computations of incompressible parameters in a periodic array of square cylinders simulating a porous media.

TL;DR: In this paper, the accuracy of the Endurance Time method in estimating average deformation demands of low and medium rise steel frames using ETA20f series of ET acceleration functions has been investigated.

TL;DR: In this paper, the authors developed a computational model to calculate water-hammer system components, such as pressure rise, speed rise, discharge variations and pressure degradation, and investigated the effect of different valve closing laws on the maximum head rise at the end of the pressure shaft and other components.

TL;DR: This paper considers the problem of a vendor-buyer integrated production-inventory model and proposes the optimal values of order quantity and mark-up percentage, using an analytical approach.

TL;DR: The results show the ability of the cGA to locate the optimal solution of problems, considered with a computational eort, comparable to improved population-based GAs and with much fewer storage requirements.

TL;DR: In this article, the pore pressure was calculated by using the available data in the carbonated reservoir of the Bangestan reservoir in South West Iran for the purpose of hydraulic fracturing operation studies.

TL;DR: In this article, a Disturbed State Concept (DSC) with a Hierarchical Single-Surface (HISS) plasticity model and a Generalized Plasticity Model (GPM) model with a non-associated threshold rule are used to characterize the constitutive behavior of soils.

TL;DR: A new hybrid metaheuristic algorithm based on the scatter search approach is developed to solve the well-known resource-constrained project scheduling problem by combining two solutions from scatter search to build a set of precedence feasible activity lists and select some of them as children for the new population.