Showing papers by "National Institute of Technology, Silchar published in 2017"
TL;DR: In this paper, the design of a hybrid system based on PV-biomass gasifier-diesel and grid and optimize the system configuration for different load profiles was analyzed for different peak load, energy demand profiles and grid availability.
226 citations
TL;DR: Experimental results suggest that the proposed GWO method is more stable and yields solutions of higher quality than PSO and BFO based methods, and is found to be faster than BFO but slower than the PSO based method.
Abstract: Multilevel thresholding is one of the most important areas in the field of image segmentation. However, the computational complexity of multilevel thresholding increases exponentially with the increasing number of thresholds. To overcome this drawback, a new approach of multilevel thresholding based on Grey Wolf Optimizer (GWO) is proposed in this paper. GWO is inspired from the social and hunting behaviour of the grey wolves. This metaheuristic algorithm is applied to multilevel thresholding problem using Kapur's entropy and Otsu's between class variance functions. The proposed method is tested on a set of standard test images. The performances of the proposed method are then compared with improved versions of PSO (Particle Swarm Optimization) and BFO (Bacterial Foraging Optimization) based multilevel thresholding methods. The quality of the segmented images is computed using Mean Structural SIMilarity (MSSIM) index. Experimental results suggest that the proposed method is more stable and yields solutions of higher quality than PSO and BFO based methods. Moreover, the proposed method is found to be faster than BFO but slower than the PSO based method.
225 citations
TL;DR: In this article, the effect of using nanofluids as heat transfer fluid, effect of altering absorber plate design for better capture of radiation, methods of heat loss reduction, use of polymer, employing mini channels for fluid flow, using PCM (phase changing materials) to provide heat during night without tank and effect of use of enhancement devices like inserts and reflector have been discussed.
Abstract: Solar flat plate collectors are devices used to trap solar thermal energy and use it for heating applications like water heating, room heating and other industrial applications. Flat plate collectors are popular for low and medium heating applications and there are undergoing constant development in terms of size reduction and enhanced efficiency. This paper presents an overview on the different techniques that are employed to enhance the efficiency of flat late collectors. Effect of using nanofluids as heat transfer fluid, effect of altering absorber plate design for better capture of radiation, methods of heat loss reduction, use of polymer, employing mini channels for fluid flow, using PCM (phase changing materials) to provide heat during night without tank and effect of use of enhancement devices like inserts and reflector have been discussed in this paper. A brief insight on various techniques used to analyse the effects and various designs has also been presented with the development methodology. Some analytical studies and CFD models have also been mentioned. This review paper also deals with the suggestions for the research work which can be carried out in the direction of heat transfer from solar flat plate collectors.
188 citations
TL;DR: The significance of edge computing is highlighted by providing real-life scenarios that have strict constraint requirements on application response time by devise a taxonomy to classify the current research efforts in the domain of edge Computing.
Abstract: The virtually unlimited available resources and wide range of services provided by the cloud have resulted in the emergence of new cloud-based applications, such as smart grids, smart building control, and virtual reality. These developments, however, have also been accompanied by a problem for delay-sensitive applications that have stringent delay requirements. The current cloud computing paradigm cannot realize the requirements of mobility support, location awareness, and low latency. Hence, to address the problem, an edge computing paradigm that aims to extend the cloud resources and services and enable them to be nearer the edge of an enterprise's network has been introduced. In this article, we highlight the significance of edge computing by providing real-life scenarios that have strict constraint requirements on application response time. From the previous literature, we devise a taxonomy to classify the current research efforts in the domain of edge computing. We also discuss the key requirements that enable edge computing. Finally, current challenges in realizing the vision of edge computing are discussed.
150 citations
TL;DR: In this article, a comparative assessment on the various deoxygenation pathways with their reaction mechanisms to opt for the suitable pathway for conversion of vegetable oils into hydrocarbon fuels based on yield and selectivity of the desired product, ease of use, economy etc.
Abstract: Growing demand for fossil fuels and related environmental issues have directed global attention towards development of alternative fuels from renewable sources. In this regard, biodiesel synthesized from vegetable oils and animal fats has shown potential as alternative to diesel fuel owing to its comparable fuel properties and combustion characteristics. However, higher oxygen content in biodiesel has raised some technical issues for its long term utilization in engines. Subsequently, the second generation liquid hydrocarbon fuels are being developed via catalytic deoxygenation of fatty acids present in vegetable oils. Presently, the research focus is on the pathways for catalytic deoxygenation like hydrodeoxygenation, decarboxylation, and decarbonylation. In hydrodeoxygenation, use of hydrogen gas and sulfided metal catalysts ensure higher conversion of vegetable oil into hydrocarbon fuel compared to the other two pathways. On the contrary, decarboxylation and decarbonylation are mostly hydrogen-free processes ensuring economical production of hydrocarbon fuel from vegetable oils. Hence, the techno-economical issues related to deoxygenation process need to be addressed for its commercial viability. Further, key operating parameters like nature of catalysts and supports, catalyst amount, reaction temperature, reaction atmosphere, hydrogen partial pressure, feed type, feed rate, type of solvent, H2/fatty acid molar ratio etc. are reported to have substantial influence on the hydrocarbon yield and selectivity. This review paper expounds a comparative assessment on the various deoxygenation pathways with their reaction mechanisms to opt for the suitable pathway for conversion of vegetable oils into hydrocarbon fuels based on yield and selectivity of the desired product, ease of use, economy etc. It also explicates the influence of various operating parameters to obtain optimum hydrocarbon conversion and selectivity during catalytic deoxygenation of vegetable oils and related feedstock.
150 citations
TL;DR: In this paper, a detailed green energy planning for sustainable development has been studied extensively to find the most suitable common strategy for energy management to answer the following questions: (i) which approaches were predominantly applied in a particular region? (ii) which evaluating criteria were paid more intentness to energy planning in that region?(iii) Is there any inadequacy of the approaches?
Abstract: Globalization leads the modern world towards green sources of energy. Green energy is clean sources of energy that have a lower environmental impact compared to conventional energy technology. Green energy plays a significant role in the strategic energy planning process for any country. Regarding energy resources, India plays an important part on the world scene. However, the energy systems of the different regions and territories varied on various parameters. Therefore, a detailed green energy planning for sustainable development has been studied extensively to find the most suitable common strategy for energy management to answer the following questions: (i) which approaches were predominantly applied in a particular region? (ii) Which evaluating criteria were paid more intentness to energy planning for sustainable development in that region? (iii) Is there any inadequacy of the approaches?. Various decision-making strategies, integrated approaches, combined methods have proposed to characterize the energy management problem by different researchers. In modern power management, the performance of different green energy is evaluated against multiple criteria rather than considering a single factor-consumption. This paper reviews the various work on distinct approaches, integrated approaches, multi-criteria decision-making methods, etc., for green energy planning and scheduling problem. This research not only provides confirmation that the energy management strategies are better than the traditional methods, but also aids the researchers and decision makers in applying the procedures.
124 citations
TL;DR: In this article, the authors present a concise state-of-the-art review along with an exhaustive comparative investigation on surrogate models for critical comparative assessment of uncertainty in natural frequencies of composite plates on the basis of computational efficiency and accuracy.
123 citations
TL;DR: In this article, the authors presented automatic generation control (AGC) of an interconnected two-area hybrid thermal system with additional power generation from dish-Stirling solar thermal system (DSTS) and wind turbine system (WTS).
122 citations
TL;DR: The present study provides a new approach in improving the performance of Bi2O3 rods/RGO composite in energy and environmental applications by attributing the enhancement of photocatalytic properties to the synergistic effect between Bi2 O3 rods and graphene sheets.
107 citations
TL;DR: A data-level solution has been offered to the concerned problem with novelty in effective elimination of majority instances without losing valuable information by amalgamating aspects of outlier and redundancy detection to the baseline system.
104 citations
TL;DR: In this article, the effect of different strut injectors on the combustion and mixing performance of a two-strut scramjet combustor was investigated using ANSYS 14-FLUENT code.
01 Oct 2017
TL;DR: A modified CSO is being proposed in this paper where two thirds of the population swarms are being updated by a tri-competitive criterion unlike CSO, which confirms the superiority of MCSO over many other state-of-the-art meta-heuristics, including CSO.
Abstract: Display Omitted The proposed work (MCSO) is motivated by the Competitive Swarm Optimizer (CSO).2/3rd of the swarm are updated in MCSO every time by a tri-competitive criteria.Both CEC 2008 and CEC 2010 benchmark functions have been solved using MCSO.Statistical results confirms the superiority of MCSO with faster convergence rate.Clearly, MCSO maintains good balance between exploration and exploitation search. In the recent literature a popular algorithm namely Competitive Swarm Optimizer (CSO) has been proposed for solving unconstrained optimization problems that updates only half of the population in each iteration. A modified CSO (MCSO) is being proposed in this paper where two thirds of the population swarms are being updated by a tri-competitive criterion unlike CSO. A small change in CSO makes a huge difference in the solution quality. The basic idea behind the proposition is to maintain a higher rate of exploration to the search space with a faster rate of convergence. The proposed MCSO is applied to solve the standard CEC2008 and CEC2013 large scale unconstrained benchmark optimization problems. The empirical results and statistical analysis confirm the better overall performance of MCSO over many other state-of-the-art meta-heuristics, including CSO. In order to confirm the superiority further, a real life problem namely sampling-based image matting problem is solved. Considering the winners of CEC 2008 and 2013, MCSO attains the second best position in the competition.
TL;DR: In this article, a phytosynthetic, additive-free, economically viable, environmentally sustainable and rapid methodology for the formation of sphere-shaped Ag-SnO2 nanocomposites of 9 nm average particle size employing the stem extracts of Saccharum officinarum was described.
Abstract: Herein, we describe a phytosynthetic, additive-free, economically viable, environmentally sustainable and rapid methodology for the formation of sphere-shaped Ag-SnO2 nanocomposites of 9 nm average particle size employing the stem extracts of Saccharum officinarum. Employing various spectroscopic techniques, the morphology, size, crystallinity, elemental conformation, and functional groups liable for surface stabilization as well as capping were depicted. Considerably, the Ag-SnO2 nanocomposite in aqueous phase revealed excellent removal efficiency for the abatement of four industrially emerging pollutants (Methylene Blue, Rose Bengal, Methyl Violet 6B, and 4-nitrophenol) and probable mechanisms were also suggested. Nearly, 99.1, 99.6, 99.5, and 98.4% of Methylene Blue, Rose Bengal, Methyl Violet 6B, and 4-nitrophenol were eradicated respectively, within 60, 75, 75, and 58.3 min using the synthesized nanocomposite. Moreover, the spent nanocomposites were renewed and their photocatalytic proficiencies were...
TL;DR: In this article, the effect of strut lip height, staggered strut and the strut position relative to the combustor entrance on the combustion enhancement of a two-strut scramjet combustor was analyzed.
TL;DR: In particular, the deviation observed in the measured ratio of branching fractions has been observed not only in the standard model prediction, but also in $b\ensuremath{\rightarrow}c$ charged current interactions and also in flavor changing neutral current interactions as discussed by the authors.
Abstract: Deviations from the standard model prediction have been observed not only in $b\ensuremath{\rightarrow}c$ charged current interactions but also in $b\ensuremath{\rightarrow}s$ flavor changing neutral current interactions. In particular, the deviation observed in the measured ratio of branching fractions ${R}_{D}=\mathcal{B}(B\ensuremath{\rightarrow}D\ensuremath{\tau}\ensuremath{
u})/\mathcal{B}(B\ensuremath{\rightarrow}Dl\ensuremath{
u})$ and ${R}_{{D}^{*}}=\mathcal{B}(B\ensuremath{\rightarrow}{D}^{*}\ensuremath{\tau}\ensuremath{
u})/\mathcal{B}(B\ensuremath{\rightarrow}{D}^{*}l\ensuremath{
u})$, where $l=(e,\ensuremath{\mu})$, is more pronounced and the combined excess currently stands at a $3.9\ensuremath{\sigma}$ level. If it persists and is confirmed by future experiments, it would be a definite hint of new physics. In this context, we consider ${B}_{c}\ensuremath{\rightarrow}{\ensuremath{\eta}}_{c}l\ensuremath{
u}$ and ${B}_{c}\ensuremath{\rightarrow}J/\mathrm{\ensuremath{\Psi}}l\ensuremath{
u}$ decays mediated via $b\ensuremath{\rightarrow}cl\ensuremath{
u}$ charged current interactions and employ an effective theory approach to give a prediction on various observables such as the ratio of the branching ratio, tau polarization fraction, and forward-backward asymmetry for these decay modes.
TL;DR: In this article, the thermal hydraulic performance of fin tube heat exchangers with circular, oval and flat tubes having inline and staggered arrangement was evaluated and the MOORA (multiobjective optimization on the basis of ratio analysis) method was employed to obtain the order of performance and that order is compared with the conventional PECs (performance evaluation criteria), showing good agreements.
TL;DR: In this article, the authors reported a 4-D dissipative autonomous chaotic system with line of equilibria and many unique properties, such as chaotic 2-torus, quasi-periodic and multistability.
Abstract: The paper reports the simplest 4-D dissipative autonomous chaotic system with line of equilibria and many unique properties. The dynamics of the new system contains a total of eight terms with one nonlinear term. It has one bifurcation parameter. Therefore, the proposed chaotic system is the simplest compared with the other similar 4-D systems. The Jacobian matrix of the new system has rank less than four. However, the proposed system exhibits four distinct Lyapunov exponents with $$(+, 0, -, -)$$
sign for some values of parameter and thus confirms the presence of chaos. Further, the system shows chaotic 2-torus $$(+,0,0,-)$$
, quasi-periodic $$[(0,0,-,-), (0,0,0,-)]$$
and multistability behaviour. Bifurcation diagram, Lyapunov spectrum, phase portrait, instantaneous phase plot, Poincare map, frequency spectrum, recurrence analysis, 0–1 test, sensitivity to initial conditions and circuit simulation are used to analyse and describe the complex and rich dynamic behaviour of the proposed system. The hardware circuit realisation of the new system validates the MATLAB simulation results. The new system is developed from the well-known Rossler type-IV 3-D chaotic system.
TL;DR: In this article, the authors investigated the heat transfer and pressure drop characteristics for two different channels, namely, raccoon and serpentine for different values of amplitude and wavelength of the wall waviness.
TL;DR: In this article, the performance of a Kirloskar single cylinder direct injection compression ignition water cooled diesel engine having capacity 5.2kW was analyzed using microalgae oil and methyl ester.
Abstract: The microalgae oil obtained from chlorella protothecoides was converted to microalgae oil methyl ester using transesterification process. The physical and chemical properties of microalgae oil and microalgae oil methyl ester were tested and it was observed that chlorella protothecoides oil and microalgae oil methyl ester can meet the ASTM standards for the characteristics tested. In this research work performance, combustion and emission parameters were analyzed on a Kirloskar single cylinder direct injection compression ignition water cooled diesel engine having capacity 5.2 kW fueled with diesel, microalgae oil and microalgae oil methyl ester. The engine showed the reduction in emission of CO, UBHC, NO x and smoke opacity as compared to those of diesel when fueled with microalgae oil and microalgae oil methyl ester. A general trend of decrease in the brake thermal efficiency with the use of microalgae oil and microalgae oil methyl ester was observed.
TL;DR: In this article, a simulation of a double strut and strut side fuel injection model for the DLR scramjet is presented and discussed, where the simulation results show that the fuel and air mixing not taking place at required level due to less resident time of air in the combustor for this innovative struts have been modeled such that it should improve the mixing of air and fuel.
TL;DR: In this paper, the authors investigated the heat transfer enhancement of heat sink using perforated pin fin with linear and staggered arrangement and found that up to certain perforation number and size, the heat dissipation rate of perforations was always higher than the solid ones and with the variation in fin shape and per-foration geometry heat transfer rate improved significantly.
TL;DR: In this paper, a series of laboratory model tests on an unreinforced sand bed (USB) and a geogrid-reinforced Sand bed (GRSB) placed over a group of vertically encased stone columns (VESC) floating in soft clay and their numerical simulations were conducted.
TL;DR: In this article, a study was carried out in four districts of Assam to assess the technical functionality of the solar home lighting systems (SHLS), service delivery model, institutional mechanism, maintenance and monitoring, user's awareness and its impacts on rural livelihood.
06 Jul 2017-Microsystem Technologies-micro-and Nanosystems-information Storage and Processing Systems
TL;DR: In this paper, a numerical and experimental investigation of fluids mixing in straight and serpentine micro-channels was performed by solving momentum, continuity and mass diffusion equations, and the experimental results showed that the mixing efficiency of around 95.5, 70.20, and 48.54% has been achieved for straight channel at inlet velocities 0.001, 0.12, 95.10, and 65.03, respectively.
Abstract: This paper represents a numerical and experimental investigation of fluids mixing in straight and serpentine micro-channels. These microchannels are fabricated with the help of soft lithography technique. The width of straight and serpentine micro-channels after fabrication is obtained around 335 and 282 µm respectively. Numerical simulations of fluids mixing in micro-channels are performed by solving momentum, continuity and mass diffusion equations. Mixing performance has been evaluated in three average inlet velocities such as 0.001, 0.007 and 0.0167 m/s. The numerical results show that in serpentine micro-channel, an effective mixing has been achieved in almost all the flow conditions whereas in straight channel that is achieved for 0.001 m/s velocity only. Water and water-KMnO4 solution are used as working fluids in this study. The experimental results show that the mixing efficiency of around 95.5, 70.20, and 48.54% has been achieved for straight channel at inlet velocities 0.001, 0.007 and 0.0167 m/s respectively. However, in serpentine micro-channel, the mixing efficiency has been achieved around 97.12, 95.10, and 65.21% at inlet velocities 0.007, 0.0167 and 0.03 m/s respectively. Moreover, the experimental results are compared with the numerical results where it has been observed that the results are quite identical to each other.
TL;DR: A green method for the synthesis of Gold@Silver@Silver chloride (Au@Ag@AgCl) core-double shells nanoparticles (NPs) using Momordica charantia leaves extract was reported in this article.
TL;DR: In this article, the effect of control parameters on response measures, that is, surface roughness, material removal rate, and edge deviation, was analyzed and optimization of parameters considering different weight percentage for each performance measure.
Abstract: This article focuses on parametric optimization for photochemical machining (PCM) of brass and german silver. The aim of the study is to analyze the effect of control parameters on response measures, that is, surface roughness, material removal rate, and edge deviation and optimization of parameters considering different weight percentage for each performance measure. The control parameters have been selected as etchant concentration, etching temperature, and etching time. Using full factorial method of design of experiments, PCM has been carried out using ferric chloride as etchant. Surface roughness and edge deviation should be less, while material removal rate is desired high. For satisfying this multi-objective condition, overall evaluation criteria (OEC) have been formulated by assigning different and equal weight percentage to response measures. The optimized condition for particular OEC is obtained, and analysis of variance (ANOVA) has been performed for observing effect of control paramete...
TL;DR: In this paper, a double cavity scramjet combustor has been simulated using the two-dimensional compressible Reynolds-Averaged Navier-Stokes (RANS) equations coupled with two equation standard k-ɛ turbulence model as well as the finite-rate/eddy-dissipation reaction model.
TL;DR: In this paper, an X-ray diffraction analysis of the prepared AMCs exposes the presence of cenosphere particles without any formation of other intermetallic compounds, and a hybrid approach of grey-based response surface methodology (GRSM) was imposed for predicting the optimal combination of processing parameters in EDM process.
22 Mar 2017
TL;DR: This paper presents a low cost Health sensor platform for rural health monitoring with a well-structured and secure interface between medical experts and Remote centers for sharing of important medical parameters and introduced a new algorithm for implementation.
Abstract: Any country with Social, technological and economical advancement needs enhanced healthcare system. Telemedicine healthcare system provides the provision of medical treatment from a remote distance. The telemedicine research and product development has embarked prodigious growth during the past decade primarily due to tremendous technological advancement in ICT and automation. The aim of IoT-based health care system is to ensure and increase the welfare of patients and the quality of life in rural areas. In this paper we present a low cost Health sensor platform for rural health monitoring with a well-structured and secure interface between medical experts and Remote centers for sharing of important medical parameters. In our proposed and implemented model we developed separate interface for medical experts and remote Centre's and introduced a new algorithm for implementation. Features like live video streaming, chat boxes, automatic prescription generation and push notification are included. The prototype is used for trial under the supervision of medical experts and the data are compared with standard test done in pathological laboratory. The result is satisfactory with good level of acceptance.
TL;DR: A long 512-bit Deoxyribonucleic Acid (DNA) based key sequence has been used for improving the data security, and it is secured against the collision attack, man-in-the-middle attack, internal attack, etc.