@article { author = {Faghri, A.}, title = {Signal Design at lsolated lntersecaions Using Expert Systems Technology}, journal = {International Journal of Engineering}, volume = {8}, number = {4}, pages = {181-190}, year = {1995}, publisher = {Materials and Energy Research Center}, issn = {1025-2495}, eissn = {1735-9244}, doi = {}, abstract = {The procedural steps for developing an expert system for designing signals at isolated intersections are described and the most important development issues for each step are discussed. The steps include problem analysis and definition, preliminary prototype specification, knowledge acquisition strategy development, prototype development plan, knowledge extraction, knowledge representation, tool/paradigm selection, prototype development, testing and refinement, and verification and validation. The result is a user friendly expert system that can be used by practicing engineers to design signalization for isolated intersections; for intersections that already exist but no control configuration such as detector placement, phasing, or timing has not been determined yet; and, for intersections that already have all the required features but need to he updated and enhanced.}, keywords = {Expert Systems,Isolated Intersections,Design,Software}, url = {https://www.ije.ir/article_71132.html}, eprint = {https://www.ije.ir/article_71132_572569b804b388b2e314bf9800e9eab8.pdf} } @article { author = {Kaatuzian, H. and Adibi, A.}, title = {Simulation and Design of an Organic Quantum Film Electrooptic Switch}, journal = {International Journal of Engineering}, volume = {8}, number = {4}, pages = {191-198}, year = {1995}, publisher = {Materials and Energy Research Center}, issn = {1025-2495}, eissn = {1735-9244}, doi = {}, abstract = {In this paper the simulation and design of a quantum-film electro-optic switch is considered. This photonic device, is made from a new organic dipolar material called MNA or 2-methyl-4 nitroaniline, which possesses a high merit in comparison with it's inorganic counterparts (e.g. LiNbO3, GaAs, InSb, Quartz, etc). Montecarlo method is used to simulate the photon-it-electron interaction in this material and the introduced physical model is based on wave-particle nature of light to demonstrate the Pokiels' Electro-optic effect in M7NA optical switch. The main advantages of this design are wide optical bandwidth (0.5-2 microns wavelength), low power consumption and high speed data transmission.}, keywords = {Quantum,Film,Electro,optic Effect,Pockets,Benzene Family,Montecarlo Method,Optical Switch,Ordinary and Extraordinary Refractive Indices,Phase Retardation,First Quarter Wave Thickness}, url = {https://www.ije.ir/article_71133.html}, eprint = {https://www.ije.ir/article_71133_5cf38ca7050d8653a8e333dce0bfd513.pdf} } @article { author = {Sadrnezhaad, S.K.}, title = {Thermodynamics and Kinetics of Vaporization of Pbs From Complex Cu-Fe Mattes}, journal = {International Journal of Engineering}, volume = {8}, number = {4}, pages = {199-212}, year = {1995}, publisher = {Materials and Energy Research Center}, issn = {1025-2495}, eissn = {1735-9244}, doi = {}, abstract = {Thermodynamics and kinetics of vaporization of lead sulfide from typical copper-smelting mattes of commercial interest are investigated in the temperature range 1388 K to 1573 K by vapor transport technique and plasma arc spectroscopy. The total mass of the dominant vaporizing species PbS that leaves the matte is described by the Newman's numerical solution to the second Fick's law combined with the experimental boundary conditions of the system. This solution is obtained through the application of the Laplace transform series expansion method stated by Crank. The three steps that are used to describe the rate of vaporization of PbS are: the diffusive transport of PbS through the liquid phase, the equilibrium at the gas-matte interface and the diffusion through the stagnant layer of gas above the surface of the melt. With the particular experimental set-up and the condenser weight gain, it is shown that the activity coefficient of PbS is simply a function of the temperature and the composition of the bearing phase. The enthalpy and the entropy of dissolution of PbS in hot liquid mattes are estimated to berespectively-41 KJ/mol and 20 to 40 J/mol.K depending on the temperature and the composition of the liquid mattes of this investigation.}, keywords = {Kinetics,Vaporization,Lead,PbS,Matte,Transportation Method,Activity coefficient,Dissolution,Entropy,Enthalpy}, url = {https://www.ije.ir/article_71134.html}, eprint = {https://www.ije.ir/article_71134_d929422c47dc41c6193949e40a250a5a.pdf} } @article { author = {Ghorashi, M. and Esmailzadeh, E.}, title = {Vibration Analysis of Beams Traversed by a Moving Mass}, journal = {International Journal of Engineering}, volume = {8}, number = {4}, pages = {213-220}, year = {1995}, publisher = {Materials and Energy Research Center}, issn = {1025-2495}, eissn = {1735-9244}, doi = {}, abstract = {A detailed investigation into the analysis of beams with different boundary conditions. carrying either a moving mass or force is performed. Analytical and numerical techniques for determination of the dynamic behavior of beams due to a concentrated travelling force or mass are presented. The transformation of the familiar Euler-Bernoulli thin beam equation into a series of ordinary differential equations is demonstrated. These equations are solved numerically using fourth order Runge-Kutta and central difference expansion methods. It is observed that the results corresponding to either method of solution, with the assumption made (moving force or mass) are very close. Moreover, the moving force problem is solved using the finite element method. The inertial effect of the moving mass has been proven to be an important factor in the dynamic behavior of such structures. Finally. using the obtained dynamic deflection functions, values of maximum shear force and bending moment at each time step are calculated and variation of these parameters with time is demonstrated.}, keywords = {Moving Loads,vehicles,Vibration of Bridges,Dynamics}, url = {https://www.ije.ir/article_71135.html}, eprint = {https://www.ije.ir/article_71135_b04c3b1e0c6450e841c02e59dcba4ac0.pdf} } @article { author = {Korayem, M. H.}, title = {Optimal Trajectory of Flexible Manipulator with Maximum Load Carrying Capacity}, journal = {International Journal of Engineering}, volume = {8}, number = {4}, pages = {221-232}, year = {1995}, publisher = {Materials and Energy Research Center}, issn = {1025-2495}, eissn = {1735-9244}, doi = {}, abstract = {In this paper, a new formulation along with numerical solution for the problem of finding a point-to-point trajectory with maximum load carrying capacities for flexible manipulators is proposed. For rigid manipulators, the major limiting factor in determining the Dynamic Load Carrying Capacity (DLCC) is the joint actuator capacity. The flexibility exhibited by light weight robots or by robots operating at a higher speed dictates the need for an additional constraint to be imposed for situations where precision tracking i. e., the allowable deformation at the end effector is required. An Iterative Linear Programming (ILP) method is used to optimise the load (load mass and load moment of inertia) of elastic robot subject to both constraints. A general computational procedure for the multiple-link case is presented in detail. Simulation is carried out for a two-link planer robot. The results confirm the necessity of the dual constraints.}, keywords = {Maximum Load,flexible manipulator,Trajectory Optimization}, url = {https://www.ije.ir/article_71136.html}, eprint = {https://www.ije.ir/article_71136_6bdeaa462c7e0373b3faca9db99e4961.pdf} } @article { author = {Mahdavi Tabatabayee, N. and Kenarangui, R.}, title = {On Line Electric Power Systems State Estimation Using Kalman Filtering (RESEARCH NOTE)}, journal = {International Journal of Engineering}, volume = {8}, number = {4}, pages = {233-235}, year = {1995}, publisher = {Materials and Energy Research Center}, issn = {1025-2495}, eissn = {1735-9244}, doi = {}, abstract = {In this paper principles of extended Kalman filtering theory is developed and applied to simulated on-line electric power systems state estimation in order to trace the operating condition changes through the redundant and noisy measurements. Test results on IEEE 14 - bus test system are included. Three case systems are tried; through the comparing of their results, it is concluded that the proposed dynamic estimator have great advantage over the static state estimation in its accuracy and real time implementation.}, keywords = {state estimation,Kalman Filter,power systems}, url = {https://www.ije.ir/article_71137.html}, eprint = {https://www.ije.ir/article_71137_6647a39a135e64eb9ed29032fd1c28ec.pdf} }