Isfahan University of Technology Journal of Computational Methods in Engineering 2228-7698 17 2 1998 04 15 The Vector Control of Three-Phase Salient Pole Synchronous Machines Supplied by Pulse-Width- Modulated Voltage Source Inverters The Vector Control of Three-Phase Salient Pole Synchronous Machines Supplied by Pulse-Width- Modulated Voltage Source Inverters 1 19 2686 FA J. Soltani And M. Fallah Journal Article 2022 12 31 In this paper, computer simulation of a three-phase synchronous motor drive is described. This drive/system is supplied with a new type of pulse-width modulated voltage source inverter (PWM VSI) whose amplitude of the first harmonic, compared to a conventional sinusoidal PWM VSI, is increased by about 17% and whose amplitude of higher harmonics is also reduced inversely proportional to their orders. This system has low torque pulsations and approximately has a unity power factor at operation below the base speed. In addition, it has a dynamic performance very close to DC drives with quick dynamic response. In this paper, computer simulation of a three-phase synchronous motor drive is described. This drive/system is supplied with a new type of pulse-width modulated voltage source inverter (PWM VSI) whose amplitude of the first harmonic, compared to a conventional sinusoidal PWM VSI, is increased by about 17% and whose amplitude of higher harmonics is also reduced inversely proportional to their orders. This system has low torque pulsations and approximately has a unity power factor at operation below the base speed. In addition, it has a dynamic performance very close to DC drives with quick dynamic response. https://jcme.iut.ac.ir/article_2686_3a0844cee4fcf57de0c71e9ad3035478.pdf

Isfahan University of Technology Journal of Computational Methods in Engineering 2228-7698 17 2 1998 04 15 Using FFI Interpolator and VQ Quantization for Designing of High Quality 1200 BPS Speech Vocoder Using FFI Interpolator and VQ Quantization for Designing of High Quality 1200 BPS Speech Vocoder 21 27 2687 FA A. Sayadian Journal Article 2022 12 31 Storaging or transmission of speech signals at very low bit rate is a hot area in the field of speech processing. We used stochastic inter-frame interpolators and vector quantization (VQ) as a new method for developing a high quality 1200 BPS speech vocoder. The objective and subjecgtive test results show that performance of the new vocoder is compairable with 4800 BPS standard vocoders (as CELP). Storaging or transmission of speech signals at very low bit rate is a hot area in the field of speech processing. We used stochastic inter-frame interpolators and vector quantization (VQ) as a new method for developing a high quality 1200 BPS speech vocoder. The objective and subjecgtive test results show that performance of the new vocoder is compairable with 4800 BPS standard vocoders (as CELP). https://jcme.iut.ac.ir/article_2687_573eec40e4ef4f2089531dd5cbf629f8.pdf

Isfahan University of Technology Journal of Computational Methods in Engineering 2228-7698 17 2 1998 04 15 Windowing Effects of Short Time Fourier Transform on Wideband Array Signal Processing Using Maximum Likelihood Estimation Windowing Effects of Short Time Fourier Transform on Wideband Array Signal Processing Using Maximum Likelihood Estimation 29 42 2688 FA S. Sadri S. Gazor And A. M. Doosthoseini Journal Article 2022 12 31 During the last two decades, Maximum Likelihood estimation (ML) has been used to determine Direction Of Arrival (DOA) and signals propagated by the sources, using narrowband array signals. The algorithm fails in the case of wideband signals. As an attempt by the present study to overcome the problem, the array outputs are transformed into narrowband frequency bins, using short time Fourier transform together with ML, to estimate DOAs and the signals. The effect of window parameters (i.e, type, length and decimation factor) on the bias and variance of estimation of DOAs and signals is investigated. The algorithm robustness and convergence in presence of low SNR and coherent signals is illustrated. It is also shown that the local optimal problem encountered in the narrowband case is resolved for the wideband signals. During the last two decades, Maximum Likelihood estimation (ML) has been used to determine Direction Of Arrival (DOA) and signals propagated by the sources, using narrowband array signals. The algorithm fails in the case of wideband signals. As an attempt by the present study to overcome the problem, the array outputs are transformed into narrowband frequency bins, using short time Fourier transform together with ML, to estimate DOAs and the signals. The effect of window parameters (i.e, type, length and decimation factor) on the bias and variance of estimation of DOAs and signals is investigated. The algorithm robustness and convergence in presence of low SNR and coherent signals is illustrated. It is also shown that the local optimal problem encountered in the narrowband case is resolved for the wideband signals. https://jcme.iut.ac.ir/article_2688_b38e5ff5f816ac6e4169bce9314b2996.pdf

Isfahan University of Technology Journal of Computational Methods in Engineering 2228-7698 17 2 1998 04 15 The Problem of Scheduling Several Products on A Single Facility with the Simulated Annealing Technique The Problem of Scheduling Several Products on A Single Facility with the Simulated Annealing Technique 43 56 2689 FA F. Mokhatab-Rafiei And M. Moattar Hosaini Journal Article 2022 12 31 This paper considers the Economic Lot Scheduling Problem, that is, the problem of scheduling several products on a single facility so as to minimize holding and setup costs. Combination of frequency and timing as well as production quantity make this problem Np-hard. A heuristic is developed to obtain a good solution to ELSP. The proposed heuristic makes use of the Simulated Annealing Technique. This heuristic gives a sharper upper bound upper bound to holding and setup costs. This paper considers the Economic Lot Scheduling Problem, that is, the problem of scheduling several products on a single facility so as to minimize holding and setup costs. Combination of frequency and timing as well as production quantity make this problem Np-hard. A heuristic is developed to obtain a good solution to ELSP. The proposed heuristic makes use of the Simulated Annealing Technique. This heuristic gives a sharper upper bound upper bound to holding and setup costs. https://jcme.iut.ac.ir/article_2689_577fd60255d4bb0f466464849ffe6d8e.pdf

Isfahan University of Technology Journal of Computational Methods in Engineering 2228-7698 17 2 1998 04 15 Effect of Use of Granulated Slag Instead of Portland Cement on the Properties of Concrete Effect of Use of Granulated Slag Instead of Portland Cement on the Properties of Concrete 57 67 2690 FA S.Dilmaghani And F. Zainalli Journal Article 2022 12 31 In this research, 210 concrete cube specimens (15cm) were made replacing 0, 5, 10, 15, 20, 25, 30, 35, 40, 50, and 60 percent of slag powder from Isfahan Steel Mill for cement. The control specimens were made with 350 kg/m3 cement content and the water cement ratio in all specimens was 0.51. The Slump value and compressive strength of concrete specimens in 7, 28 and 90 days were obtained and the results were compared. The test results show that replacement of 25 to 35 percent or slag powder for cement gives satisfactory results in obtaining concrete with suitable compressive strength and slump value. Also the results indicate that by increasing the percentage of slag powder replaced for cement, the shrinkage of the concrete and its resistance against sulphates will increase. In this research, 210 concrete cube specimens (15cm) were made replacing 0, 5, 10, 15, 20, 25, 30, 35, 40, 50, and 60 percent of slag powder from Isfahan Steel Mill for cement. The control specimens were made with 350 kg/m3 cement content and the water cement ratio in all specimens was 0.51. The Slump value and compressive strength of concrete specimens in 7, 28 and 90 days were obtained and the results were compared. The test results show that replacement of 25 to 35 percent or slag powder for cement gives satisfactory results in obtaining concrete with suitable compressive strength and slump value. Also the results indicate that by increasing the percentage of slag powder replaced for cement, the shrinkage of the concrete and its resistance against sulphates will increase. https://jcme.iut.ac.ir/article_2690_f6185f0ef02dcaec414a3171cd01c697.pdf

Isfahan University of Technology Journal of Computational Methods in Engineering 2228-7698 17 2 1998 04 15 Derivation of Intensity -Duration-Frequency -Area(IDFA) Curves for Mashhad City Derivation of Intensity -Duration-Frequency -Area(IDFA) Curves for Mashhad City 69 81 2691 FA B. Ghahreman Journal Article 2022 12 31 A knowledge of rainfall distribution over a finite area is needed for small bydraulic structures design. Hydrologists have always been concerned about Depth- Area- Duration (DAD) for a specific storm in a watershed. An intense storm occurred on June 6, 1992 which claimed some lives in parts of Mashhad, Khorasan Province, Iran. Data of rainfall depth at 29 raingauge stations around the city and its suburbs were gathered. There also exist three automatic raingauges at Mashhad airport, the College of Agriculture, and Khorasan Water Authority and one at Toroq Dam in Mashhad suburb. A survey of hyetographs for June 6, 1992 of these stations revealed that the airport raingauge did not work well while dimensionless mass curves for other raingauges were quite similar. Two rain centers at the College of Agriculture (with 50 mm rainfall) and Wheat Silage (with 53 mm rainfall) were detected. The DAD relationships for this storm were derived. Intensity- Duration- Frequency (IDF) curves for the airport station were derived and were compared with those of the College of Agriculture and Khorasan Water Authority. In the absence of an abnormal topography, the Theissen method was utilized for deriving a regional IDF for Mashhad City. Intensity- Duration- Frequency- Area (IDFA) curves, a new concept in hydrometeorology, has been initiated for the first time for Mashhad. Combination of regional IDF with DAD of the most intense storm in Mashhad was a key to represent such a new concept. A knowledge of rainfall distribution over a finite area is needed for small bydraulic structures design. Hydrologists have always been concerned about Depth- Area- Duration (DAD) for a specific storm in a watershed. An intense storm occurred on June 6, 1992 which claimed some lives in parts of Mashhad, Khorasan Province, Iran. Data of rainfall depth at 29 raingauge stations around the city and its suburbs were gathered. There also exist three automatic raingauges at Mashhad airport, the College of Agriculture, and Khorasan Water Authority and one at Toroq Dam in Mashhad suburb. A survey of hyetographs for June 6, 1992 of these stations revealed that the airport raingauge did not work well while dimensionless mass curves for other raingauges were quite similar. Two rain centers at the College of Agriculture (with 50 mm rainfall) and Wheat Silage (with 53 mm rainfall) were detected. The DAD relationships for this storm were derived. Intensity- Duration- Frequency (IDF) curves for the airport station were derived and were compared with those of the College of Agriculture and Khorasan Water Authority. In the absence of an abnormal topography, the Theissen method was utilized for deriving a regional IDF for Mashhad City. Intensity- Duration- Frequency- Area (IDFA) curves, a new concept in hydrometeorology, has been initiated for the first time for Mashhad. Combination of regional IDF with DAD of the most intense storm in Mashhad was a key to represent such a new concept. https://jcme.iut.ac.ir/article_2691_110eec23201d80e40d0c4a48954e2ff5.pdf

Isfahan University of Technology Journal of Computational Methods in Engineering 2228-7698 17 2 1998 04 15 Adaptive Solution of Steady Two Dimensional Flow on an Unstructured Grid Adaptive Solution of Steady Two Dimensional Flow on an Unstructured Grid 83 95 2692 FA K. Mazaheri And B. Lesani Journal Article 2022 12 31 Two-dimensional Euler equations have been solved on an unstructured grid. An upwind finite volume scheme, based on Roes flux difference splitting method, is used to discretize the equations. Using advancing front method, an initial Delaunay triangulation has been made. The adaptation procedure involves mesh enrichment coarsening in regions of flow with high low gradients of flow properties, according to an introduced adaptation criteria. To validate the procedure, a couple of internal and external steady flows are solved. One may see the effectiveness of introducing relatively few cells and the local adaptation algorithm on accuracy. Solution dependency on grid is also studied. Two-dimensional Euler equations have been solved on an unstructured grid. An upwind finite volume scheme, based on Roes flux difference splitting method, is used to discretize the equations. Using advancing front method, an initial Delaunay triangulation has been made. The adaptation procedure involves mesh enrichment coarsening in regions of flow with high low gradients of flow properties, according to an introduced adaptation criteria. To validate the procedure, a couple of internal and external steady flows are solved. One may see the effectiveness of introducing relatively few cells and the local adaptation algorithm on accuracy. Solution dependency on grid is also studied. https://jcme.iut.ac.ir/article_2692_d790c9e6c0b5e02c87b375e782ac01bc.pdf

Isfahan University of Technology Journal of Computational Methods in Engineering 2228-7698 17 2 1998 04 15 Determination of BKW Equation of State Parameters via Measurement of the Detonation Velocity in Condensed Explosives Determination of BKW Equation of State Parameters via Measurement of the Detonation Velocity in Condensed Explosives 97 108 2693 FA S. Hossain-Pour And M. Farschi Journal Article 2022 12 31 An optical system has been redesigned and used to measure detonation velocity as a function of condensed explosive density for RDX, HMX, PETN. These measurements are then used to determine and fine tune parameters appearing in the BKW (Beker-Kistiakowsky-Wilson) equation of state for gases at extremely high pressures. Steady state form of conservation equations along with the BKW state equation and the Chapman-Jouquer hypothesis are used to determine the detonation velocity and the thermodynamic state of the gas behind the detonation front. An iterative scheme is used to adjust the BKW equation parameters such that the calculated detonation velocities, obtained from the solution of the above set of equations, match the measured values. An optical system has been redesigned and used to measure detonation velocity as a function of condensed explosive density for RDX, HMX, PETN. These measurements are then used to determine and fine tune parameters appearing in the BKW (Beker-Kistiakowsky-Wilson) equation of state for gases at extremely high pressures. Steady state form of conservation equations along with the BKW state equation and the Chapman-Jouquer hypothesis are used to determine the detonation velocity and the thermodynamic state of the gas behind the detonation front. An iterative scheme is used to adjust the BKW equation parameters such that the calculated detonation velocities, obtained from the solution of the above set of equations, match the measured values. https://jcme.iut.ac.ir/article_2693_3bd4017318837e92a66298c7855f4427.pdf

Isfahan University of Technology Journal of Computational Methods in Engineering 2228-7698 17 2 1998 04 15 The Solution of Laminar Incompressible Flow Equation with Free Surfaces in Curvilinear Coordinates The Solution of Laminar Incompressible Flow Equation with Free Surfaces in Curvilinear Coordinates 109 128 2694 FA M. Golafshani And A. H. Shooshtari Journal Article 2022 12 31 In this paper a novel numerical approach is presented for solving the transient incompressible fluid flow problems with free surfaces in generalized two-dimensional curvilinear coordinate systems. Solution algorithm is a combination of implicit real-time steps and explicit pseudo-time steps. Governing fluid flow equations are discretized using a collocated finite-volume mesh. Convective terms are approximated with an accurate monotonicity preserving upwind scheme. Free surfaces are first approximated by lines of constant slope and then convected using the volume-of-fluid (VOF) technique. A number of problems, both with and without free surfaces, have been solved to demonstrate the ease and usefulness of the scheme. Accuracy of the results thus obtained is assessed by comparison with other numerical as well as analytical results in the literature. In this paper a novel numerical approach is presented for solving the transient incompressible fluid flow problems with free surfaces in generalized two-dimensional curvilinear coordinate systems. Solution algorithm is a combination of implicit real-time steps and explicit pseudo-time steps. Governing fluid flow equations are discretized using a collocated finite-volume mesh. Convective terms are approximated with an accurate monotonicity preserving upwind scheme. Free surfaces are first approximated by lines of constant slope and then convected using the volume-of-fluid (VOF) technique. A number of problems, both with and without free surfaces, have been solved to demonstrate the ease and usefulness of the scheme. Accuracy of the results thus obtained is assessed by comparison with other numerical as well as analytical results in the literature. https://jcme.iut.ac.ir/article_2694_cf9b2d0406020c56599f9a93708832b5.pdf

Isfahan University of Technology Journal of Computational Methods in Engineering 2228-7698 17 2 1998 04 15 Solution of Laminar Boundary Layer and Turbulent Free Jet With Neural Networks Solution of Laminar Boundary Layer and Turbulent Free Jet With Neural Networks 129 137 2695 FA H. Basirat Tabrizi M. B. Menhaj And A. Shabani Journal Article 2022 12 31 A novel neuro-based method is introduced to solve the laminar boundary layer and the turbulent free jet equations. The proposed method is based on cellular neural networks, CNNs, which are recently applied widely to solve partial differential equations. The effectiveness of the method is illustrated through some examples. A novel neuro-based method is introduced to solve the laminar boundary layer and the turbulent free jet equations. The proposed method is based on cellular neural networks, CNNs, which are recently applied widely to solve partial differential equations. The effectiveness of the method is illustrated through some examples. https://jcme.iut.ac.ir/article_2695_dbbf603ff0e99629dda5d75b6f75f966.pdf

Isfahan University of Technology Journal of Computational Methods in Engineering 2228-7698 17 2 1998 04 15 Shape Memory Properties in Cu-Zn-Al Alloy Shape Memory Properties in Cu-Zn-Al Alloy 139 153 2696 FA K. Sadrnezhaad And H. Ahmadian Journal Article 2022 12 31 In this research a Cu-Zn-Al alloy is produced by melting the raw materials in an electric resistance furnace and then pouring it into a steel mould. The optimum way to achieve the final analysis in the hypo-eutectoid range is determined and the influence of the alloying element, Ti on the grain size and the shape memory properties of the samples are investigated. Solution treatment (done at 850˚C) followed by quenching in ice-water mixture results in the formation of the martensitic structure and the shape memory effect. Aging at temperatures bellow 200˚C results in the reduction of transformation temperatures, while aging at temperatures between 200˚C and 350˚C results in the enhancement of these temperatures and at temperatures above 350˚C results in the destruction of the shape memory properties. Effect of super-elasticity at 40˚C (between Md and Ms) is observed and tensile tests are run at 25˚C and -55˚C to verify the influence of the prevailing phase. In this research a Cu-Zn-Al alloy is produced by melting the raw materials in an electric resistance furnace and then pouring it into a steel mould. The optimum way to achieve the final analysis in the hypo-eutectoid range is determined and the influence of the alloying element, Ti on the grain size and the shape memory properties of the samples are investigated. Solution treatment (done at 850˚C) followed by quenching in ice-water mixture results in the formation of the martensitic structure and the shape memory effect. Aging at temperatures bellow 200˚C results in the reduction of transformation temperatures, while aging at temperatures between 200˚C and 350˚C results in the enhancement of these temperatures and at temperatures above 350˚C results in the destruction of the shape memory properties. Effect of super-elasticity at 40˚C (between Md and Ms) is observed and tensile tests are run at 25˚C and -55˚C to verify the influence of the prevailing phase. https://jcme.iut.ac.ir/article_2696_dc2b690516158a874dd8aabe1365c6a0.pdf

Isfahan University of Technology Journal of Computational Methods in Engineering 2228-7698 17 2 1998 04 15 The Effect of Siliconizing and Borosiliconizing Processes on Microstructure and Morphology of Carbon Steel Surface Layers The Effect of Siliconizing and Borosiliconizing Processes on Microstructure and Morphology of Carbon Steel Surface Layers 155 168 2697 FA S. R. Bakhsi M. Salehi F. Ashrafizadeh Journal Article 2022 12 31 A study for optimizing of siliconizing and borosiliconizing processes on carbon steels has been carried out. The process parameters, i.e, time and powder mixture, were considered for optimization of the case depth, surface quality and the hardness profile. Time and temperature of the processes were 4 hr and 950˚C, respectively. Powder mixture in siliconizing process was 2.5% ferrosilicon, 2.5% NH4Cl and Al2O3, while the optimum simultaneous borosiliconizing process was obtained in a mixture of 90% boronizing powder and 10% siliconizing powder. These powders had already been optimized, individually. This is a depth of layer of about 150μm and maximum hardness value of 600HV0.1 in siliconized steels, and a depth of layer of about 100μm and a hardness value of greater than 3000 HV0.1 in borosiliconized steels. Microscopical tests by light microscopes, XRD and EDAX analyses indicated Fe3Si and Fe5Si3 phases within the surface layers of siliconized steel, and B(FeSi)3, Fe4.9Si2B, FeSi, FeB and Fe2B phases within the surface layers of borosiliconized steels. A study for optimizing of siliconizing and borosiliconizing processes on carbon steels has been carried out. The process parameters, i.e, time and powder mixture, were considered for optimization of the case depth, surface quality and the hardness profile. Time and temperature of the processes were 4 hr and 950˚C, respectively. Powder mixture in siliconizing process was 2.5% ferrosilicon, 2.5% NH4Cl and Al2O3, while the optimum simultaneous borosiliconizing process was obtained in a mixture of 90% boronizing powder and 10% siliconizing powder. These powders had already been optimized, individually. This is a depth of layer of about 150μm and maximum hardness value of 600HV0.1 in siliconized steels, and a depth of layer of about 100μm and a hardness value of greater than 3000 HV0.1 in borosiliconized steels. Microscopical tests by light microscopes, XRD and EDAX analyses indicated Fe3Si and Fe5Si3 phases within the surface layers of siliconized steel, and B(FeSi)3, Fe4.9Si2B, FeSi, FeB and Fe2B phases within the surface layers of borosiliconized steels. https://jcme.iut.ac.ir/article_2697_ab452534c5ce28c4fbb0e102d4a4fb2e.pdf

Isfahan University of Technology Journal of Computational Methods in Engineering 2228-7698 17 2 1998 04 15 H&infin Controller Design for Static VAR Compensators in Industrial Networks H&infin Controller Design for Static VAR Compensators in Industrial Networks 169 177 2698 FA M. Abedi S. A. Taher A. K. Sedigh And H. Seifi Journal Article 2022 12 31 This paper deals with the design and evaluation of a robust controller for static VAR compensator (SVC) in remote industrial power systems to enhance the voltage profile for three-phase single cage induction motor (SCIM) loads. The controller design is based on H∞ theory to deal with uncertainties arising in industrial network modelling. The performance of the H∞ controller has been evaluated extensively through non-linear time domain simulation. It is concluded that the robust controller (RSVC) enhances the voltage profile for SCIM loads compared with the optimal (OSVC) type which consists of optimal state feedback (LQR). This paper deals with the design and evaluation of a robust controller for static VAR compensator (SVC) in remote industrial power systems to enhance the voltage profile for three-phase single cage induction motor (SCIM) loads. The controller design is based on H∞ theory to deal with uncertainties arising in industrial network modelling. The performance of the H∞ controller has been evaluated extensively through non-linear time domain simulation. It is concluded that the robust controller (RSVC) enhances the voltage profile for SCIM loads compared with the optimal (OSVC) type which consists of optimal state feedback (LQR). https://jcme.iut.ac.ir/article_2698_fb4ab556bc42d6f0ee0f9e24ec4d1af0.pdf

Isfahan University of Technology Journal of Computational Methods in Engineering 2228-7698 17 2 1998 04 15 A New Guidance Method for Surface to Surface Ballistic Missiles without Mandatory Engine Cut-Off A New Guidance Method for Surface to Surface Ballistic Missiles without Mandatory Engine Cut-Off 179 184 2699 FA M. A. Massoumnia Gh Alizadeh And H. R. Momeni Journal Article 2022 12 31 In this paper, a new guidance method for surface to surface ballistic missiles without mandatory engine cut-off will be presented. The complexity of solid fuel engine cut-off demands a comprehensive method for guiding these missiles. In the method presented in this paper, a certain guidance law is applied such that by transmitting appropriate commands to the control system, by changing the missiles path and also through wasting additional fuel energy, the missile velocity will be equal to the desired one at the end of the burning time. The results of the simulation indicate that the aforementioned guidance method is quite effective and practical with long-range missiles having thrust vector control. In this paper, a new guidance method for surface to surface ballistic missiles without mandatory engine cut-off will be presented. The complexity of solid fuel engine cut-off demands a comprehensive method for guiding these missiles. In the method presented in this paper, a certain guidance law is applied such that by transmitting appropriate commands to the control system, by changing the missiles path and also through wasting additional fuel energy, the missile velocity will be equal to the desired one at the end of the burning time. The results of the simulation indicate that the aforementioned guidance method is quite effective and practical with long-range missiles having thrust vector control. https://jcme.iut.ac.ir/article_2699_0415740eaa4d9decbc8da001d3fd805f.pdf

Isfahan University of Technology Journal of Computational Methods in Engineering 2228-7698 17 2 1998 04 15 Determination of Kinetic Parameters for Catalytic Isomerization of Glucose to Fructose by immobilized Glucose Isomerase in an Aqueous-Ethanol Medium Determination of Kinetic Parameters for Catalytic Isomerization of Glucose to Fructose by immobilized Glucose Isomerase in an Aqueous-Ethanol Medium 185 191 2700 FA F. Vahabzadeh And A. Aiwazi Journal Article 2022 12 31 Catalytic isomerization of glucose to fructose by immobilized glucose isomerase in an aqueous-ethanol medium was studied. Using Michaelis-Menten equation and Haldane relationship, the main kinetic parameters were determined: Kmf, Vmf, Kmr, Vmr. By comparing the aqueous-ethanol medium with an aqueous solution, the measured values of Kmr and Kmf were increased in the aqueous-ethanol solution, while the values for maximal velocities (Vmf and Vmr) were decreased in this medium. The results from these comparisons were discussed with reference to the rate constants in this isomerization reaction. The integrated form of the Michaelis-Menten equation was used with good approximation to predict the course of the isomerization reaction in the aqueous-ethanol solution. Catalytic isomerization of glucose to fructose by immobilized glucose isomerase in an aqueous-ethanol medium was studied. Using Michaelis-Menten equation and Haldane relationship, the main kinetic parameters were determined: Kmf, Vmf, Kmr, Vmr. By comparing the aqueous-ethanol medium with an aqueous solution, the measured values of Kmr and Kmf were increased in the aqueous-ethanol solution, while the values for maximal velocities (Vmf and Vmr) were decreased in this medium. The results from these comparisons were discussed with reference to the rate constants in this isomerization reaction. The integrated form of the Michaelis-Menten equation was used with good approximation to predict the course of the isomerization reaction in the aqueous-ethanol solution. https://jcme.iut.ac.ir/article_2700_f1b0775946bc0329b35b823b86eeb5f5.pdf