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Bio-oil and biochar production using thermal and catalytic pyrolysis of low-value waste neem seeds over low-cost catalysts:effects of operating conditions on product yields and studies of physicochemical characteristics of bio-oil and biochar

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Biochar 2021年第4期3卷 641-656页

作者： Ranjeet Kumar Mishra Kaustubha Mohanty Department of Chemical Engineering Indian Institute of Technology GuwahatiGuwahati 781039India

This study addressed a comparative assessment of the effect of low-cost catalysts on the yield and physicochemical properties of *** and catalytic pyrolysis of neem seeds(NM)was conducted in a fixed bed semi-batch reactor at optimum conditions(550°C temperature,80°C min−1 heating rate,0.5 mm particle size,and 100 mL min−1 sweep gas flow rate).The produced bio-oil and biochar were characterized through thermal stability,elemental composition(CHNS),higher heating value(HHV),Nuclear Magnetic Resonance(NMR)spectroscopy,Field Emission Scanning Electron Microscopy(FESEM),Fourier-transform infrared spectroscopy(FTIR),Gas Chromatography-Mass Spectrometry(GC-MS),zeta potential,water-holding capacity(WHC),and BET(Brunauer,Emmett and Teller)surface area ***,it was noticed that the use of catalysts at optimized condition substantially boosted the quality and yield of *** results established that thermal pyrolysis yielded 49.53 wt.%of bio-oil,while catalytic pyrolysis yielded(51.25 wt.%,53.12 wt.%,48.68 wt.%,and 50.65 wt.%for MgO,NaOH,Al_(2)O_(3),and ZSM-5,respectively)at 20 wt.%catalyst *** physicochemical study of bio-oil confirmed improved properties of bio-oil in terms of viscosity,heating value,pH and carbon ***,the FTIR study of bio-oil indicates the occurrence of phenolic products,aromatics,ketones,acidic compounds,esters,alcohol and aldehyde impurities,whereas 1H NMR study supported FTIR ***-MS study demonstrated that the introduc-tion of catalysts significantly reduced the oxygenated substances,acidic products,phenolic compounds and substantially increased the ***,characterization results of neem seed biochar(NMC)established the existence of HHV(23.26 MJ kg^(−1)),carbon content(62.66%),zeta potential(31.68 mV),water holding capacity(41.50%)and lower BET surface area(4.60 m^(2)g^(−1)).

关键词： Waste neem seeds Pyrolysis Catalysts Bio-fuel GC–MS FTIR 1H NMR Biochar FESEM

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Co-pyrolysis of waste biomass and waste plastics(polystyrene and waste nitrile gloves)into renewable fuel and value-added chemicals

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Carbon Resources Conversion 2020年第1期3卷 145-155页

作者： Ranjeet Kumar Mishra Kaustubha Mohanty Department of Chemical Engineering Indian Institute of Technology GuwahatiGuwahati 781039India

The present study addresses the influence of blending of waste plastics(i.e.,polystyrene,PS and waste nitrile gloves,WNG)with mahua seeds(MH)for co-pyrolytic liquid yield and its fuel *** blends of waste plastics were mixed with biomass(10,20 and 30 wt%)and pyrolyzed in a semi-batch reactor at an optimized environment(550℃ temperature,80℃ min^(-1) heating rate,and 100 mL min^(-1) N_(2) flow rate).Physicochemical results displayed its ability to yield renewable fuel and valuable ***-pyrolysis outcomes showed that blending of waste plastics at 20 wt%,yielded maximum liquid(44.18±1.2 wt%and 45.89±1.4 wt%for MH+WNG and MH+PS respectively)which was higher than thermal pyrolysis of individual MH(39.26±1.2 wt%).Further,characterization results revealed a substantial reduction in viscosity,oxygen content,moisture,and a positive increment in gross heating value,carbon content and *** examination exposed the attendance of mainly aromatics,acids,phenols,water,esters and ***,NMR analysis of pyrolytic oil confirmed an increase in aromaticity by blending of waste plastics(20 wt%)while there was a reduction in paraffinic ***-MS investigation revealed substantial improvement in hydrocarbons and minimization in the oxygen-rich products by blending of waste plastics at 20 wt%.

关键词： Waste biomass Plastics Co-pyrolysis Pyrolytic oil Fuel characterization

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A BCH code assisted modified NCO based LSPF-DPLL topology for Nakagami-m, Rayleigh and Rician fading channels

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Digital Communications and Networks 2019年第2期5卷 102-110页

作者： Sabyasachi Bhattacharyya Aradhana Misra Kandarpa Kumar Sarma Department of Electronics and Telecommunication Engineering Barak Valley Engineering CollegeNiralaKarimganj 788701AssamIndia Department of Electronics and Communication Engineering Gauhati UniversityGopinath Bordoloi NagarJalukbariGuwahati 781014AssamIndia Department of Electronics and Communication technology Gauhati UniversityGopinath Bordoloi NagarJalukbariGuwahati 781014AssamIndia

In spite of the rapid developments in communication technologies over the past few decades, which include attractive features offered by the presently used 3G/4G systems,让 continues to be a challenge to render adequate services with the exponential rise in the number of users and applications. However, efficient alternatives, including 5G methods, are being explored to mitigate this problem. Such systems also aspire to render sustained coverage with lesser constraints on power and Quality of Service (QoS). Today, versatile Digital Phase Locked Loop (DPLL) based packages find place as communication receivers. Of late, a Least Square Polynomial Fitting DPLL (LSPF-DPLL) with Modified Phase Resolving Numerically Controlled Oscillator (MPR-NCO), which demonstrates excellent time performance and maintains satisfactory error rates, was proposed. A Bose, Chaudhuri, and Hocquenghem (BCH) channel code assisted version of the MPR-NCO based LSPF-DPLL system is presented here. The proposed system exhibits better B让 Error Rate (BER), throughput, and baud rate levels over the previously proposed uncoded version.

关键词： Coding Fading Frequency tracking Least squares Phase recovery

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A Nash Game Approach to Mixed H_2/H_∞ Model Predictive Control: Part 3–Output Feedback Case

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International Journal of Automation and computing 2018年第5期15卷 616-624页

作者： Pakkiriswamy Aadaleesan Prabirkumar Saha Department of Chemical Engineering Indian Institute of Technology Guwahati

In this paper, the state-feedback Nash game based mixed H2/H∞ design^（[1, 2]）has been extended for output feedback case. The algorithm is applied to control bioreactor system with a Laguerre-Wavelet Network（LWN）^（[3, 4]）model of the *** is achieved by using the LWN model as a deviation model and by successively linearising the deviation model along the state trajectory. For reducing the approximation error and to improve the controller performance, symbolic derivation algorithm, viz.,automatic differentiation is employed. A cautionary note is also given on the fragility of the output feedback mixed H2/H∞ model predictive controller^（[4, 5]）due to its sensitivity to its own parametric changes.

关键词： Robust model predictive control mixed H2/H∞ control Nash game output feedback model predictive control (MPC) automatic differentiation fragility of controller.

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Identification of integrating and critically damped systems with time delay

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Control Theory and technology 2015年第1期13卷 29-36页

作者： BAJARANGBALI Somanath MAJHI Department of Electronics and Electrical Engineering Indian Institute of Technology Guwahati

This paper presents identification of second order plus dead time （SOPDT） integrating and critically damped systems based on relay feedback testing. Relay with hysteresis is applied to the unknown system to get the sustained oscillations also called as limit cycle. The limit cycle parameters are utilized in mathematical expressions which are derived using state space technique so that exact process model parameters are estimated. As the relay with hysteresis helps in generating sustained oscillations and also reduces effect of measurement noise which is an important issue in system identification. Different types of processes in the form of transfer function models are considered to show the efficacy of the proposed method and results are compared with available methods in the literature with and without noise effect.

关键词： System identification time delay systems relay with hysteresis

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Exciting Forces for a Wave Energy Device Consisting of a Pair of Coaxial Cylinders in Water of Finite Depth

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Journal of Marine Science and Application 2013年第3期12卷 315-324页

作者： Mohammad Hassan Swaroop Nandan Bora Department of Mathematics Indian Institute of Technology GuwahatiGuwahati 781039 India

Two coaxial vertical cylinders-one is a riding hollow cylinder and the other a solid cylinder of greater radius at some distance above an impermeable horizontal bottom,were *** problem of diffraction by these two cylinders,which were considered as idealization of a buoy and a circular plate,can be considered as a wave energy *** wave energy that is created and transferred by this device can be appropriately used in many applications in lieu of conventional *** of separation of variables was used to obtain the analytical expressions for the diffracted potentials in four clearly identified *** applying the appropriate matching conditions along the three virtual boundaries between the regions,a system of linear equations was obtained,which was solved for the unknown *** potentials allowed us to obtain the exciting forces acting on both *** of exciting forces were obtained for different radii of the cylinders and for different gaps between the *** was observed that changes in radius and the gap had significant effect on the *** was found that mostly the exciting forces were significant only at lower *** exciting forces almost vanished at higher *** problem was also investigated for the base case of no plate arrangement,i.e.,the case having only the floating cylinder tethered to the *** of forces for both arrangements was carried *** order to take care of the radiation of the cylinders due to surge motion,the corresponding added mass and the damping coefficients for both cylinders were also *** the results were depicted graphically and compared with available results.

关键词： diffraction finite depth virtual boundary exciting force wave energy device coaxial cylinder

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