Pub Date : 2021-11-29DOI: 10.38032/jea.2021.04.003
Gopal Sen, M. Inam
This assessment is centered on the characteristics of natural convection heat transfer of Aluminium Oxide-Air nanofluid inside an inverted T-shaped enclosure with differentially heated sidewalls. The left edges of the enclosed cavity have been treated as a heated wall and are kept at a constant temperature. The right edges are also maintained at a constant temperature but lower than the heated wall. The top and bottom faces of the cavity have been considered adiabatic. The evaluation has been numerically investigated using ANSYS fluent. The effect of different significant parameters like volume fraction of nanoparticles, the shape of the enclosure, and Rayleigh number on the heat transfer characteristics inside an inverted T shape enclosure have been investigated. In this numerical analysis, a series of DNS simulations have been conducted for different Rayleigh numbers in the range of 103 to 106, the volume fraction of particles in the range 0≤ φ ≤0.1, and for the different aspect ratios for the inverted T shape have been conducted. The outcomes of this CFD analysis indicate a remarkable rise in the average heat transfer coefficient with the rising volume fraction of Al2O3 particles in the air. An increase of the average Nusselt number was also observed with the increase of Rayleigh number, but it drops slightly at a higher volume fraction of nanoparticles due to an increase in conductive heat transfer. For Rayleigh numbers ≥ 104, both the average Nusselt number and average heat transfer coefficient decrease up to a certain shape of the cavity aspect ratio. After that cavity aspect ratio, both the parameters value increase. But in the case of Rayleigh number = 103, both of the values decrease with the increase in the cavity aspect ratio.
{"title":"Numerical Analysis of Natural Convection Heat Transfer Inside an Inverted T-Shaped Cavity Filled with Nanofluid","authors":"Gopal Sen, M. Inam","doi":"10.38032/jea.2021.04.003","DOIUrl":"https://doi.org/10.38032/jea.2021.04.003","url":null,"abstract":"This assessment is centered on the characteristics of natural convection heat transfer of Aluminium Oxide-Air nanofluid inside an inverted T-shaped enclosure with differentially heated sidewalls. The left edges of the enclosed cavity have been treated as a heated wall and are kept at a constant temperature. The right edges are also maintained at a constant temperature but lower than the heated wall. The top and bottom faces of the cavity have been considered adiabatic. The evaluation has been numerically investigated using ANSYS fluent. The effect of different significant parameters like volume fraction of nanoparticles, the shape of the enclosure, and Rayleigh number on the heat transfer characteristics inside an inverted T shape enclosure have been investigated. In this numerical analysis, a series of DNS simulations have been conducted for different Rayleigh numbers in the range of 103 to 106, the volume fraction of particles in the range 0≤ φ ≤0.1, and for the different aspect ratios for the inverted T shape have been conducted. The outcomes of this CFD analysis indicate a remarkable rise in the average heat transfer coefficient with the rising volume fraction of Al2O3 particles in the air. An increase of the average Nusselt number was also observed with the increase of Rayleigh number, but it drops slightly at a higher volume fraction of nanoparticles due to an increase in conductive heat transfer. For Rayleigh numbers ≥ 104, both the average Nusselt number and average heat transfer coefficient decrease up to a certain shape of the cavity aspect ratio. After that cavity aspect ratio, both the parameters value increase. But in the case of Rayleigh number = 103, both of the values decrease with the increase in the cavity aspect ratio.","PeriodicalId":292407,"journal":{"name":"Journal of Engineering Advancements","volume":"119 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132996217","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-11-09DOI: 10.38032/jea.2021.04.002
Kazi Jubair, M. Islam, D. Chakraborty
Banana stems are very cheap and abundant in nature which can be used to extract fiber. In this paper, banana fiber is used as a reinforcement and epoxy as a matrix to manufacture banana fiber-reinforced epoxy composite. Glass fiber mat, and roving are also used as reinforcement along with banana fiber to manufacture hybrid composites. The objective of this paper is to compare the mechanical properties of hybrid composites with that of pure banana fiber-reinforced composites. The hand lay-up method is used to manufacture all the composites, and tensile and flexural properties are investigated according to the corresponding ASTM standard. It is found that the tensile and flexural strength of banana and glass fiber roving hybrid composites are much higher compared to pure banana fiber-reinforced epoxy composites which make this hybrid composite suitable for low strength application.
{"title":"Investigation of Mechanical Properties of Banana-Glass Fiber Reinforced Hybrid Composites","authors":"Kazi Jubair, M. Islam, D. Chakraborty","doi":"10.38032/jea.2021.04.002","DOIUrl":"https://doi.org/10.38032/jea.2021.04.002","url":null,"abstract":"Banana stems are very cheap and abundant in nature which can be used to extract fiber. In this paper, banana fiber is used as a reinforcement and epoxy as a matrix to manufacture banana fiber-reinforced epoxy composite. Glass fiber mat, and roving are also used as reinforcement along with banana fiber to manufacture hybrid composites. The objective of this paper is to compare the mechanical properties of hybrid composites with that of pure banana fiber-reinforced composites. The hand lay-up method is used to manufacture all the composites, and tensile and flexural properties are investigated according to the corresponding ASTM standard. It is found that the tensile and flexural strength of banana and glass fiber roving hybrid composites are much higher compared to pure banana fiber-reinforced epoxy composites which make this hybrid composite suitable for low strength application.","PeriodicalId":292407,"journal":{"name":"Journal of Engineering Advancements","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114134401","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-10-03DOI: 10.38032/jea.2021.04.001
Mostafizur Rahman, Saeem Bin Abdullah
In general, the suspension systems are used to absorb vibrations, bump, rolls, dip from shock loads due to road surface irregularities. It performs its major role without affecting the vehicles’ stability and overall handling during operation. Coil springs are used as suspension element in light vehicles to attenuate unwanted vibrations. A spring is an elastic object used to store mechanical energy and it can be twisted, pulled or extended by some force and can return to its initial position when the force is released. In this study, mild steel material was taken into consideration in designing and fabricating coil springs. Theoretical and experimental investigations were conducted to calculate springs’ stiffness and to make validation between them. Three model of springs having coils 10, 11, 14 respectively are designed which have slight stiffness difference both theoretically and experimentally. The models were analyzed to determine mechanical behaviors for randomly chosen loading conditions ranging from 29.4 N to 176.4 N which are better suited with spring size. It is noted from both numerical and experimental investigations that deflection is high when the stiffness is less and vice-versa. In addition, shear stress formation increases with the increment of stiffness and applied load. Hence, springs having high stiffness are used in suspension system to reduce vibration and other disturbances. This study shows springs of having high stiffness are comparatively compact in size and cost economic as well.
{"title":"Numerical and Experimental Study on Optimization of Coil Springs used in Vehicles’ Suspension System","authors":"Mostafizur Rahman, Saeem Bin Abdullah","doi":"10.38032/jea.2021.04.001","DOIUrl":"https://doi.org/10.38032/jea.2021.04.001","url":null,"abstract":"In general, the suspension systems are used to absorb vibrations, bump, rolls, dip from shock loads due to road surface irregularities. It performs its major role without affecting the vehicles’ stability and overall handling during operation. Coil springs are used as suspension element in light vehicles to attenuate unwanted vibrations. A spring is an elastic object used to store mechanical energy and it can be twisted, pulled or extended by some force and can return to its initial position when the force is released. In this study, mild steel material was taken into consideration in designing and fabricating coil springs. Theoretical and experimental investigations were conducted to calculate springs’ stiffness and to make validation between them. Three model of springs having coils 10, 11, 14 respectively are designed which have slight stiffness difference both theoretically and experimentally. The models were analyzed to determine mechanical behaviors for randomly chosen loading conditions ranging from 29.4 N to 176.4 N which are better suited with spring size. It is noted from both numerical and experimental investigations that deflection is high when the stiffness is less and vice-versa. In addition, shear stress formation increases with the increment of stiffness and applied load. Hence, springs having high stiffness are used in suspension system to reduce vibration and other disturbances. This study shows springs of having high stiffness are comparatively compact in size and cost economic as well.","PeriodicalId":292407,"journal":{"name":"Journal of Engineering Advancements","volume":"143 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132743776","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-09-04DOI: 10.38032/jea.2021.03.007
A. Farhan, Rezwan-us Saleheen, Chenxuan Wei, Farhan Mahbub
Noise prevailing in the image can diminish the physical appearance of the objects existing within the image and make them frail. Present research emphasizes a fuzzy inference system eradicating several types of noise from the images. The investigation implies the utilization of different levels of Salt & Pepper noise. Followed by the pixel determination applying a mask, the disparity between the focused pixel's intensity with the minimum, average, and maximum power of the chosen window has been determined. Since two fuzzy valued outputs have been obtained to match them, the one provided by a low noise rate would demonstrate the more accurate filter for the selected window. Utilizing Matlab the Peak Signal-to-Noise ratio (PSNR) and Mean Square Error (MSE) are determined for evaluating the noise reduction performance. However, these values of PSNR and MSE obtained from this research are also compared with the conventional fuzzy filtering system.
{"title":"De-noising of an Image using Fuzzy Inference System and Performance Comparison with the Conventional system","authors":"A. Farhan, Rezwan-us Saleheen, Chenxuan Wei, Farhan Mahbub","doi":"10.38032/jea.2021.03.007","DOIUrl":"https://doi.org/10.38032/jea.2021.03.007","url":null,"abstract":"Noise prevailing in the image can diminish the physical appearance of the objects existing within the image and make them frail. Present research emphasizes a fuzzy inference system eradicating several types of noise from the images. The investigation implies the utilization of different levels of Salt & Pepper noise. Followed by the pixel determination applying a mask, the disparity between the focused pixel's intensity with the minimum, average, and maximum power of the chosen window has been determined. Since two fuzzy valued outputs have been obtained to match them, the one provided by a low noise rate would demonstrate the more accurate filter for the selected window. Utilizing Matlab the Peak Signal-to-Noise ratio (PSNR) and Mean Square Error (MSE) are determined for evaluating the noise reduction performance. However, these values of PSNR and MSE obtained from this research are also compared with the conventional fuzzy filtering system.","PeriodicalId":292407,"journal":{"name":"Journal of Engineering Advancements","volume":"113 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127731664","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-08-22DOI: 10.38032/jea.2021.03.004
Kazi Mostafijur Rahman, Md. Habibur Rahaman
Recently, considerable efforts are made by the engine researches all over the world, focusing primarily on achieving ultra-low emissions of NOx (nitrogen oxides) and soot without any compromise to high thermal efficiency from dual-fuel engine. In this study, combustion performance and engine-out emission of a single cylinder gasoline-diesel dual-fuel engine are numerically investigated by employing a commercial computation fluid dynamics (CFD) software, especially developed for internal combustion engines modeling. Here, gasoline-diesel relative ratio has been varied to find its impacts on performance of a dual-fuel engine. The results show that, in-cylinder pressure, in-cylinder temperature and rate of heat release (ROHR) are increased with gradual increment in diesel relative to gasoline. Injecting higher amount of diesel directly inside the combustion chamber as pilot fuel might have facilitated the auto-ignition process by reducing the ignition delay and accelerated the premixed gasoline-air flame propagation. These led to shorter main combustion duration which is quite desirable to suppress the knock in dual-fuel engines. In addition, NOx emission is found to decrease with relatively higher percentage of diesel. On the other hand, with increasing gasoline ratio relative to diesel, combustion duration is prolonged significantly and led to incomplete combustion, thereby increasing unburned hydrocarbon (UHC) and carbon monoxide (CO).
{"title":"Effects of Gasoline-Diesel Ratio on Combustion and Emission Characteristics of a Dual-Fuel CI Engine: A CFD Simulation","authors":"Kazi Mostafijur Rahman, Md. Habibur Rahaman","doi":"10.38032/jea.2021.03.004","DOIUrl":"https://doi.org/10.38032/jea.2021.03.004","url":null,"abstract":"Recently, considerable efforts are made by the engine researches all over the world, focusing primarily on achieving ultra-low emissions of NOx (nitrogen oxides) and soot without any compromise to high thermal efficiency from dual-fuel engine. In this study, combustion performance and engine-out emission of a single cylinder gasoline-diesel dual-fuel engine are numerically investigated by employing a commercial computation fluid dynamics (CFD) software, especially developed for internal combustion engines modeling. Here, gasoline-diesel relative ratio has been varied to find its impacts on performance of a dual-fuel engine. The results show that, in-cylinder pressure, in-cylinder temperature and rate of heat release (ROHR) are increased with gradual increment in diesel relative to gasoline. Injecting higher amount of diesel directly inside the combustion chamber as pilot fuel might have facilitated the auto-ignition process by reducing the ignition delay and accelerated the premixed gasoline-air flame propagation. These led to shorter main combustion duration which is quite desirable to suppress the knock in dual-fuel engines. In addition, NOx emission is found to decrease with relatively higher percentage of diesel. On the other hand, with increasing gasoline ratio relative to diesel, combustion duration is prolonged significantly and led to incomplete combustion, thereby increasing unburned hydrocarbon (UHC) and carbon monoxide (CO).","PeriodicalId":292407,"journal":{"name":"Journal of Engineering Advancements","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128034941","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-08-20DOI: 10.38032/jea.2021.03.002
M. Uddin, M. Uddin, M. A. H. Khan, M. T. Hossain
We propose an efficient sparsity-preserving reduced-order modelling approach for index-1 descriptor systems extracted from large-scale power system models through two-sided projection techniques. The projectors are configured by utilizing Gramian based singular value decomposition (SVD) and Krylov subspace-based reduced-order modelling. The left projector is attained from the observability Gramian of the system by the low-rank alternating direction implicit (LR-ADI) technique and the right projector is attained by the iterative rational Krylov algorithm (IRKA). The classical LR-ADI technique is not suitable for solving Riccati equations and it demands high computation time for convergence. Besides, in most of the cases, reduced-order models achieved by the basic IRKA are not stable and the Riccati equations connected to them have no finite solution. Moreover, the conventional LR-ADI and IRKA approach not preserves the sparse form of the index-1 descriptor systems, which is an essential requirement for feasible simulations. To overcome those drawbacks, the fitting of LR-ADI and IRKA based projectors from left and right sides, respectively, desired reduced-order systems attained. So that, finite solution of low-rank Riccati equations, and corresponding feedback matrix can be executed. Using the mechanism of inverse projection, the Riccati-based optimal feedback matrix can be computed to stabilize the unstable power system models. The proposed approach will maintain minimized ℌ2 -norm of the error system for reduced-order models of the target models.
{"title":"SVD-Krylov based Sparsity-preserving Techniques for Riccati-based Feedback Stabilization of Unstable Power System Models","authors":"M. Uddin, M. Uddin, M. A. H. Khan, M. T. Hossain","doi":"10.38032/jea.2021.03.002","DOIUrl":"https://doi.org/10.38032/jea.2021.03.002","url":null,"abstract":"We propose an efficient sparsity-preserving reduced-order modelling approach for index-1 descriptor systems extracted from large-scale power system models through two-sided projection techniques. The projectors are configured by utilizing Gramian based singular value decomposition (SVD) and Krylov subspace-based reduced-order modelling. The left projector is attained from the observability Gramian of the system by the low-rank alternating direction implicit (LR-ADI) technique and the right projector is attained by the iterative rational Krylov algorithm (IRKA). The classical LR-ADI technique is not suitable for solving Riccati equations and it demands high computation time for convergence. Besides, in most of the cases, reduced-order models achieved by the basic IRKA are not stable and the Riccati equations connected to them have no finite solution. Moreover, the conventional LR-ADI and IRKA approach not preserves the sparse form of the index-1 descriptor systems, which is an essential requirement for feasible simulations. To overcome those drawbacks, the fitting of LR-ADI and IRKA based projectors from left and right sides, respectively, desired reduced-order systems attained. So that, finite solution of low-rank Riccati equations, and corresponding feedback matrix can be executed. Using the mechanism of inverse projection, the Riccati-based optimal feedback matrix can be computed to stabilize the unstable power system models. The proposed approach will maintain minimized ℌ2 -norm of the error system for reduced-order models of the target models.","PeriodicalId":292407,"journal":{"name":"Journal of Engineering Advancements","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121746800","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-07-23DOI: 10.38032/JEA.2021.03.001
Md. Serajus Salekin Khan, Sanjida Reza Rafa, Al Ekram Hossain Abir, A. Das
In this present era, sentiment analysis is considered as one of the most rapidly growing fields of computer science study. It is a text mining technique which is automated and determines the emotion of a text. A text can be divided into many emotions using sentiment analysis. Since there are some studies on emotion analysis in the Bangla language, it is regarded as a key research area in the field of analyzing Bangla language. This paper works with five different emotions and those are Happy, Sad, Angry, Surprise and Excited. Apart from these emotions our paper also deals with two categories, such as Abusive and Religious. We proposed a method of machine learning technique which is the SVM algorithm to extract these five individual emotions from Bangla text.
{"title":"Sentiment Analysis on Bengali Facebook Comments To Predict Fan's Emotions Towards a Celebrity","authors":"Md. Serajus Salekin Khan, Sanjida Reza Rafa, Al Ekram Hossain Abir, A. Das","doi":"10.38032/JEA.2021.03.001","DOIUrl":"https://doi.org/10.38032/JEA.2021.03.001","url":null,"abstract":"In this present era, sentiment analysis is considered as one of the most rapidly growing fields of computer science study. It is a text mining technique which is automated and determines the emotion of a text. A text can be divided into many emotions using sentiment analysis. Since there are some studies on emotion analysis in the Bangla language, it is regarded as a key research area in the field of analyzing Bangla language. This paper works with five different emotions and those are Happy, Sad, Angry, Surprise and Excited. Apart from these emotions our paper also deals with two categories, such as Abusive and Religious. We proposed a method of machine learning technique which is the SVM algorithm to extract these five individual emotions from Bangla text.","PeriodicalId":292407,"journal":{"name":"Journal of Engineering Advancements","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129325827","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-06-21DOI: 10.38032/jea.2021.02.005
M. A. Mamun, Md. Abdus Sabur, M. Gafur, Hrithita Aftab, G. Rahman
Hematite(α-Fe2O3) nanoparticles were synthesized by sol-gel process and further mixed with epoxy resin to obtain the nanocomposites. X-Ray Diffraction (XRD) and Scanning Electron Microscope (SEM) analysis revealed that α-Fe2O3 nanoparticles have an average diameter of about 30 nm, also illustrated the crystal structure and morphology of the nanomaterials. Fourier-Transform Infrared spectroscopy (FTIR) showed the functional groups that were present in α-Fe2O3 nanoparticles, neat epoxy andα-Fe2O3/epoxy nanocomposites. Vibrating Sample Magnetometer (VSM) analysis exhibits the magnetic hysteresis curve and revealed that α-Fe2O3 nanoparticles were superparamagnetic. Tensile testing was performed to obtain the tensile strength, yield strength, elongation, young modulus and required energy to deform the materials. Vickers micro-hardness test showed the surface hardness of the nanocomposites. Flexural strength also measured, which indicate the strength of nanocomposites against bending. Thermogravimetric Analysis (TGA) measurement showed the thermal properties of α-Fe2O3 nanoparticles and its influence into the epoxy matrix. UV-Vis spectroscopy was performed to obtain the optical band gap energy of the nanocomposites. DC-resistivity measurements showed a significant influence of α-Fe2O3 nanoparticles on the dc-electrical properties of the epoxy matrix.
{"title":"Fabrication and Characterization of α-Fe2O3 Nanoparticles Dispersed Epoxy Nanocomposites","authors":"M. A. Mamun, Md. Abdus Sabur, M. Gafur, Hrithita Aftab, G. Rahman","doi":"10.38032/jea.2021.02.005","DOIUrl":"https://doi.org/10.38032/jea.2021.02.005","url":null,"abstract":"Hematite(α-Fe2O3) nanoparticles were synthesized by sol-gel process and further mixed with epoxy resin to obtain the nanocomposites. X-Ray Diffraction (XRD) and Scanning Electron Microscope (SEM) analysis revealed that α-Fe2O3 nanoparticles have an average diameter of about 30 nm, also illustrated the crystal structure and morphology of the nanomaterials. Fourier-Transform Infrared spectroscopy (FTIR) showed the functional groups that were present in α-Fe2O3 nanoparticles, neat epoxy andα-Fe2O3/epoxy nanocomposites. Vibrating Sample Magnetometer (VSM) analysis exhibits the magnetic hysteresis curve and revealed that α-Fe2O3 nanoparticles were superparamagnetic. Tensile testing was performed to obtain the tensile strength, yield strength, elongation, young modulus and required energy to deform the materials. Vickers micro-hardness test showed the surface hardness of the nanocomposites. Flexural strength also measured, which indicate the strength of nanocomposites against bending. Thermogravimetric Analysis (TGA) measurement showed the thermal properties of α-Fe2O3 nanoparticles and its influence into the epoxy matrix. UV-Vis spectroscopy was performed to obtain the optical band gap energy of the nanocomposites. DC-resistivity measurements showed a significant influence of α-Fe2O3 nanoparticles on the dc-electrical properties of the epoxy matrix.","PeriodicalId":292407,"journal":{"name":"Journal of Engineering Advancements","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126600955","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-02-22DOI: 10.38032/JEA.2021.01.005
Molla Rashied Hussein, Md. Ashikur Rahman, Md. Jahidul Hassan Mojumder, Shakib Ahmed, E. Apu
Coronavirus disease 2019 or COVID-19 is a zoonosis, which means a disease that contaminates from the animals to the humans. Since it is very highly epizootic, it has forced the public health experts to implement smartphone-based applications to trace its swift transmission trajectory as well as the affected individuals. For this, the individuals’ personally identifiable information is utilized. Nonetheless, these information may hamper privacy and cyber security, especially the trust concerns, if not handled properly. If the issues are not resolved at this very moment, the consequences will induce the mass level population to use the health-related applications in their smartphones inadequately. Therefore, a catastrophe will be imminent for another COVID-19-like zoonosis to come. So, to mitigate, an extensive study was required to address this severe issue, namely, trust concern. This paper has studied the needed by discussing the recently designed and developed health-related applications region by region across the world. Moreover, it has analyzed the benefits and drawbacks. The trust defiance is recognized and inspected from the perspective of an end-user. Some recommendations are advised in the later part of this paper to leverage and collaborate the awareness campaign between the Government, the App Developers and the common individuals.
{"title":"Trust Concerns Regarding Health-Related Smartphone Apps in Collecting Personally Identifiable Information Throughout COVID-19-like Zoonosis","authors":"Molla Rashied Hussein, Md. Ashikur Rahman, Md. Jahidul Hassan Mojumder, Shakib Ahmed, E. Apu","doi":"10.38032/JEA.2021.01.005","DOIUrl":"https://doi.org/10.38032/JEA.2021.01.005","url":null,"abstract":"Coronavirus disease 2019 or COVID-19 is a zoonosis, which means a disease that contaminates from the animals to the humans. Since it is very highly epizootic, it has forced the public health experts to implement smartphone-based applications to trace its swift transmission trajectory as well as the affected individuals. For this, the individuals’ personally identifiable information is utilized. Nonetheless, these information may hamper privacy and cyber security, especially the trust concerns, if not handled properly. If the issues are not resolved at this very moment, the consequences will induce the mass level population to use the health-related applications in their smartphones inadequately. Therefore, a catastrophe will be imminent for another COVID-19-like zoonosis to come. So, to mitigate, an extensive study was required to address this severe issue, namely, trust concern. This paper has studied the needed by discussing the recently designed and developed health-related applications region by region across the world. Moreover, it has analyzed the benefits and drawbacks. The trust defiance is recognized and inspected from the perspective of an end-user. Some recommendations are advised in the later part of this paper to leverage and collaborate the awareness campaign between the Government, the App Developers and the common individuals.","PeriodicalId":292407,"journal":{"name":"Journal of Engineering Advancements","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120953954","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-12-30DOI: 10.38032/jea.2020.04.011
Mohammad Shamim Miah
This study investigates the performance of tall buildings using tuned mass damper (TMD) under dynamic loads such as harmonic loads, and the Loma Prieta Earthquake 1989 data. The numerical investigations are performed by considering a sixteen-storied dynamical system. To do this end, the aforementioned system is considered to be uncontrolled (meaning no damper is used) and a controlled case is assumed where a TMD is placed on the top floor. TMD performance mainly relies on the set of parameters (mass ratio, damping ratio, and stiffness). In reality, the tuning process of those parameters take serious effort and gets worse with the complicacy of the structure. Hence to obtain better performance of the TMD the damping ratio and the frequency of the TMD are optimized by using unconstrained derivative-free method. Finally, the uncontrolled and controlled performance of the sixteen-storied structure has been evaluated and compared. The results show that the dynamical response of the studied problem can be reduced significantly via the use of optimized parameters.
{"title":"Performance Evaluation of Tall Buildings using Optimized Tuned Mass Damper","authors":"Mohammad Shamim Miah","doi":"10.38032/jea.2020.04.011","DOIUrl":"https://doi.org/10.38032/jea.2020.04.011","url":null,"abstract":"This study investigates the performance of tall buildings using tuned mass damper (TMD) under dynamic loads such as harmonic loads, and the Loma Prieta Earthquake 1989 data. The numerical investigations are performed by considering a sixteen-storied dynamical system. To do this end, the aforementioned system is considered to be uncontrolled (meaning no damper is used) and a controlled case is assumed where a TMD is placed on the top floor. TMD performance mainly relies on the set of parameters (mass ratio, damping ratio, and stiffness). In reality, the tuning process of those parameters take serious effort and gets worse with the complicacy of the structure. Hence to obtain better performance of the TMD the damping ratio and the frequency of the TMD are optimized by using unconstrained derivative-free method. Finally, the uncontrolled and controlled performance of the sixteen-storied structure has been evaluated and compared. The results show that the dynamical response of the studied problem can be reduced significantly via the use of optimized parameters.","PeriodicalId":292407,"journal":{"name":"Journal of Engineering Advancements","volume":"127 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115624167","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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