The Experts below are selected from a list of 237 Experts worldwide ranked by ideXlab platform
Muhammad Arshad Seed Chaudhary - One of the best experts on this subject based on the ideXlab platform.
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effect of Sinusoidal Variation of feed concentration and temperature on the performance of a packed bed biological reactor a theoretical study
Chemical Engineering & Technology, 1996Co-Authors: M.m. Hassan, Muhammad Arshad Seed ChaudharyAbstract:The performance of a packed-bed biological reactor has been analysed under Sinusoidal Variations of substrate concentration and temperature for zero-order, first-order and Michaelis-Menten kinetics. The model equations were solved by the method of orthogonal collocation. The results show that the cyclic steady-state conversion is not affected by cyclic Variations in the feed concentration. However, cyclic temperature Variations with an amplitude of 20°C significantly decrease the mean exit concentration for zero-order and Michaelis-Menten kinetics compared to the constant-temperature case. The approach to cyclic steady-state conditions is estimated to be somewhat flower for zero-order kinetics than for the other kinetics models investigated. We conclude that temperature Variations during the day or changes in the performance of upstream plant will not adversely affect the performance of a packed-bed biological reactor.
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Effect of Sinusoidal Variation of feed concentration and temperature on the performance of a packed‐bed biological reactor – a theoretical study
Chemical Engineering & Technology, 1996Co-Authors: M.m. Hassan, Muhammad Arshad Seed ChaudharyAbstract:The performance of a packed-bed biological reactor has been analysed under Sinusoidal Variations of substrate concentration and temperature for zero-order, first-order and Michaelis-Menten kinetics. The model equations were solved by the method of orthogonal collocation. The results show that the cyclic steady-state conversion is not affected by cyclic Variations in the feed concentration. However, cyclic temperature Variations with an amplitude of 20°C significantly decrease the mean exit concentration for zero-order and Michaelis-Menten kinetics compared to the constant-temperature case. The approach to cyclic steady-state conditions is estimated to be somewhat flower for zero-order kinetics than for the other kinetics models investigated. We conclude that temperature Variations during the day or changes in the performance of upstream plant will not adversely affect the performance of a packed-bed biological reactor.
M.m. Hassan - One of the best experts on this subject based on the ideXlab platform.
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Effect of Sinusoidal perturbations of feed concentration on multi-substrate carbon oxidation and nitrification process in an upflow packed-bed biofilm reactor
Chemical Engineering Journal, 1997Co-Authors: M.m. Hassan, Muhammad A.s. ChaudhryAbstract:The performance of an upflow packed bed biofilm reactor has been analyzed under multi-substrate limitation by considering simultaneous carbon oxidation and nitrification reactions. For an inlet concentration of 200 mg 1−1 of NH4+-N and 50 mg 1−1 of methanol, the results show that organic substrate is consumed very rapidly near the inlet of the reactor while most of the NH4+-N is converted in the central region of the reactor. When the inlet concentration of methanol is subjected to Sinusoidal Variation, the exit concentration of NH4+-N also follows a Sinusoidal pattern although its inlet concentration was subjected to step input. However, the methanol exit concentration exhibits the typical step input response when the inlet NH4+-N concentration is subjected to Sinusoidal Variation. The concentration profiles within the biofilm reactor show that oxygen is a limiting component at the middle of the reactor when both methanol and NH4+-N inlet concentrations follow Sinusoidal Variation.
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effect of Sinusoidal Variation of feed concentration and temperature on the performance of a packed bed biological reactor a theoretical study
Chemical Engineering & Technology, 1996Co-Authors: M.m. Hassan, Muhammad Arshad Seed ChaudharyAbstract:The performance of a packed-bed biological reactor has been analysed under Sinusoidal Variations of substrate concentration and temperature for zero-order, first-order and Michaelis-Menten kinetics. The model equations were solved by the method of orthogonal collocation. The results show that the cyclic steady-state conversion is not affected by cyclic Variations in the feed concentration. However, cyclic temperature Variations with an amplitude of 20°C significantly decrease the mean exit concentration for zero-order and Michaelis-Menten kinetics compared to the constant-temperature case. The approach to cyclic steady-state conditions is estimated to be somewhat flower for zero-order kinetics than for the other kinetics models investigated. We conclude that temperature Variations during the day or changes in the performance of upstream plant will not adversely affect the performance of a packed-bed biological reactor.
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Effect of Sinusoidal Variation of feed concentration and temperature on the performance of a packed‐bed biological reactor – a theoretical study
Chemical Engineering & Technology, 1996Co-Authors: M.m. Hassan, Muhammad Arshad Seed ChaudharyAbstract:The performance of a packed-bed biological reactor has been analysed under Sinusoidal Variations of substrate concentration and temperature for zero-order, first-order and Michaelis-Menten kinetics. The model equations were solved by the method of orthogonal collocation. The results show that the cyclic steady-state conversion is not affected by cyclic Variations in the feed concentration. However, cyclic temperature Variations with an amplitude of 20°C significantly decrease the mean exit concentration for zero-order and Michaelis-Menten kinetics compared to the constant-temperature case. The approach to cyclic steady-state conditions is estimated to be somewhat flower for zero-order kinetics than for the other kinetics models investigated. We conclude that temperature Variations during the day or changes in the performance of upstream plant will not adversely affect the performance of a packed-bed biological reactor.
Muhammad A.s. Chaudhry - One of the best experts on this subject based on the ideXlab platform.
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Modelling of simultaneous methanogenesis and denitrification in an upflow packed‐bed biofilm reactor
Journal of Chemical Technology & Biotechnology, 1997Co-Authors: Muhammad A.s. ChaudhryAbstract:The performance of an upflow packed-bed biofilm reactor was investigated by considering simultaneous methanogenesis and denitrification reactions under step and Sinusoidal Variations of feed concentration and temperature. For simultaneous step inputs of 20 mg dm -3 of NO 3 - -N and 60 mg dm -3 of methanol, the proposed model shows that major conversion of both the substrates takes place in the first half of the reactor. However, when the inlet concentration of methanol is subjected to Sinusoidal Variation, while that of NO 3 - -N is maintained stepwise, the exit concentration of both methanol and NOj 3 - -N follow a Sinusoidal response. On the other hand, when the inputs are reversed (methanol stepwise and NO 3 - -N Sinusoidal), the response exhibits similar behaviour. For Sinusoidal Variation of feed temperature the exit concentration profiles of both substrates also follow a Sinusoidal pattern. For methanol, the mean steady state conversion under Sinusoidal Variation is higher than the corresponding steady state concentration when feed temperature is constant at 30°C. The model predictions are in good agreement with the experimental data available in the literature.
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Effect of Sinusoidal perturbations of feed concentration on multi-substrate carbon oxidation and nitrification process in an upflow packed-bed biofilm reactor
Chemical Engineering Journal, 1997Co-Authors: M.m. Hassan, Muhammad A.s. ChaudhryAbstract:The performance of an upflow packed bed biofilm reactor has been analyzed under multi-substrate limitation by considering simultaneous carbon oxidation and nitrification reactions. For an inlet concentration of 200 mg 1−1 of NH4+-N and 50 mg 1−1 of methanol, the results show that organic substrate is consumed very rapidly near the inlet of the reactor while most of the NH4+-N is converted in the central region of the reactor. When the inlet concentration of methanol is subjected to Sinusoidal Variation, the exit concentration of NH4+-N also follows a Sinusoidal pattern although its inlet concentration was subjected to step input. However, the methanol exit concentration exhibits the typical step input response when the inlet NH4+-N concentration is subjected to Sinusoidal Variation. The concentration profiles within the biofilm reactor show that oxygen is a limiting component at the middle of the reactor when both methanol and NH4+-N inlet concentrations follow Sinusoidal Variation.
Aleksandar Nesic - One of the best experts on this subject based on the ideXlab platform.
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bandstop microstrip pbg filter with Sinusoidal Variation of the characteristic impedance and without etching in the ground plane
Microwave and Optical Technology Letters, 2001Co-Authors: Dusan Nesic, Aleksandar NesicAbstract:In this paper, we introduce a one-dimensional (1-D) microstrip photonic bandgap (PBG) filter with only one bandgap (without harmonic response) and without etching in the ground plane. The structure has a Sinusoidal Variation of the characteristic impedance as a function of the length of the microstrip line. Three examples of the proposed filter are presented. © 2001 John Wiley & Sons, Inc. Microwave Opt Technol Lett 29: 418–420, 2001.
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1-D Microstrip PBG Filters Without Etching in the Ground Plane and with Sinusoidal Variation of the Characteristic Impedance
2001 31st European Microwave Conference, 2001Co-Authors: Dusan Nesic, Aleksandar NesicAbstract:In this paper new types of (1-D) microstrip photonic band-gap (PBG) filters are presented. They have Sinusoidal Variation of the characteristic impedance in function of the length along the microstrip line. They are, also, without etching in the ground plane. Band-stop, band-pass and low-pass filters are simulated, realized and measured. Band-stop filters give only one band-gap (without harmonic response). Band-pass and low-pass filters are serial connections of two or three band-stop filters and give very good characteristics. Agreement between simulation and measurement is very good.
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1-D microstrip PBG band-pass filter without etching in the ground plane and with Sinusoidal Variation of the characteristic impedance
5th International Conference on Telecommunications in Modern Satellite Cable and Broadcasting Service. TELSIKS 2001. Proceedings of Papers (Cat. No.01, 2001Co-Authors: Dusan Nesic, Aleksandar NesicAbstract:In this paper a new type of band-pass filter based on (1-D) microstrip photonic band-gap (PBG) is presented. The band-pass filter is a serial connection of two periodic structures with Sinusoidal Variation of the characteristic impedance in function of the position along the microstrip line. It is based only on the modification of the shape of the microstrip line, without etching in the ground plane. Band-pass is simulated, realized and measured for three different frequencies only by scaling. Agreement between simulation and measurement is very good.
Dusan Nesic - One of the best experts on this subject based on the ideXlab platform.
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bandstop microstrip pbg filter with Sinusoidal Variation of the characteristic impedance and without etching in the ground plane
Microwave and Optical Technology Letters, 2001Co-Authors: Dusan Nesic, Aleksandar NesicAbstract:In this paper, we introduce a one-dimensional (1-D) microstrip photonic bandgap (PBG) filter with only one bandgap (without harmonic response) and without etching in the ground plane. The structure has a Sinusoidal Variation of the characteristic impedance as a function of the length of the microstrip line. Three examples of the proposed filter are presented. © 2001 John Wiley & Sons, Inc. Microwave Opt Technol Lett 29: 418–420, 2001.
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1-D Microstrip PBG Filters Without Etching in the Ground Plane and with Sinusoidal Variation of the Characteristic Impedance
2001 31st European Microwave Conference, 2001Co-Authors: Dusan Nesic, Aleksandar NesicAbstract:In this paper new types of (1-D) microstrip photonic band-gap (PBG) filters are presented. They have Sinusoidal Variation of the characteristic impedance in function of the length along the microstrip line. They are, also, without etching in the ground plane. Band-stop, band-pass and low-pass filters are simulated, realized and measured. Band-stop filters give only one band-gap (without harmonic response). Band-pass and low-pass filters are serial connections of two or three band-stop filters and give very good characteristics. Agreement between simulation and measurement is very good.
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1-D microstrip PBG band-pass filter without etching in the ground plane and with Sinusoidal Variation of the characteristic impedance
5th International Conference on Telecommunications in Modern Satellite Cable and Broadcasting Service. TELSIKS 2001. Proceedings of Papers (Cat. No.01, 2001Co-Authors: Dusan Nesic, Aleksandar NesicAbstract:In this paper a new type of band-pass filter based on (1-D) microstrip photonic band-gap (PBG) is presented. The band-pass filter is a serial connection of two periodic structures with Sinusoidal Variation of the characteristic impedance in function of the position along the microstrip line. It is based only on the modification of the shape of the microstrip line, without etching in the ground plane. Band-pass is simulated, realized and measured for three different frequencies only by scaling. Agreement between simulation and measurement is very good.