Pub Date : 2024-01-29DOI: 10.52326/jes.utm.2023.30(4).06
D. Țurcanu, T. Țurcanu
The transmission of video stream over wireless networks is used by many applications and services, from the use of equipment in home communication networks to those carrying the video surveillance stream. Numerous technical challenges may arise when the unpredictable characteristics of the radio channel align or do not align with the stipulated requirements for transmission bandwidth and the necessary latency for transporting video data. All these challenges prevent users from experiencing smooth video streaming. Depending on the application scenarios, video service emphasis may vary according of Quality of Experience - QoE or parameter used traditionally in the networks, Quality of Service - QoS. The purpose of the research consists in optimization of the flow service, which ensures the adaptability of video communication to changes of conditions over the wireless computer network. As a result of a thorough analysis of the video playback characteristics related to the wireless channel, the most optimal approach in optimizing the quality of the video stream service over a wireless LAN requiring minimal modifications was identified, and namely system centric approach.
{"title":"OPTIMIZATION OF VIDEO TRANSMISSION QUALITY IN WIRELESS NETWORKS","authors":"D. Țurcanu, T. Țurcanu","doi":"10.52326/jes.utm.2023.30(4).06","DOIUrl":"https://doi.org/10.52326/jes.utm.2023.30(4).06","url":null,"abstract":"The transmission of video stream over wireless networks is used by many applications and services, from the use of equipment in home communication networks to those carrying the video surveillance stream. Numerous technical challenges may arise when the unpredictable characteristics of the radio channel align or do not align with the stipulated requirements for transmission bandwidth and the necessary latency for transporting video data. All these challenges prevent users from experiencing smooth video streaming. Depending on the application scenarios, video service emphasis may vary according of Quality of Experience - QoE or parameter used traditionally in the networks, Quality of Service - QoS. The purpose of the research consists in optimization of the flow service, which ensures the adaptability of video communication to changes of conditions over the wireless computer network. As a result of a thorough analysis of the video playback characteristics related to the wireless channel, the most optimal approach in optimizing the quality of the video stream service over a wireless LAN requiring minimal modifications was identified, and namely system centric approach.","PeriodicalId":52570,"journal":{"name":"Journal of Engineering Science","volume":"55 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140489848","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 : 2024-01-29DOI: 10.52326/jes.utm.2023.30(4).01
V. Bostan, Andrei Petco, Ion Șaragov
This paper deals with the comparison of empirical computational models used to achieve the geometrical parameters of pumps impellers with models based on Computational Fluid Dynamics (CFD) simulations and optimization algorithms. Also, the actuality of the empirical models application in modern pump manufacturing industry is analyzed. Further, an empirical model for calculating the pump impeller geometrical parameters was presented. Applying this model, the calculation of the centrifugal pump impeller parameters for CH 6,3/20 1,1-2 canned motor pump was performed. The procedure for parameterization and generation of the geometric model based on parameters obtained from this model through ANSYS DesignModeler was also presented. CFD simulation based on ANSYS CFX was used to obtain the operating characteristic of the obtained centrifugal pump impeller. The authors carried out the comparison of the results of the designed model with the original one and with the optimized impeller obtained using optimization algorithms and CFD calculations.
{"title":"EMPIRICAL MODELS’ APPLICABILITY FOR CALCULATING THE CENTRIFUGAL PUMP'S IMPELLERS GEOMETRIC PARAMETERS","authors":"V. Bostan, Andrei Petco, Ion Șaragov","doi":"10.52326/jes.utm.2023.30(4).01","DOIUrl":"https://doi.org/10.52326/jes.utm.2023.30(4).01","url":null,"abstract":"This paper deals with the comparison of empirical computational models used to achieve the geometrical parameters of pumps impellers with models based on Computational Fluid Dynamics (CFD) simulations and optimization algorithms. Also, the actuality of the empirical models application in modern pump manufacturing industry is analyzed. Further, an empirical model for calculating the pump impeller geometrical parameters was presented. Applying this model, the calculation of the centrifugal pump impeller parameters for CH 6,3/20 1,1-2 canned motor pump was performed. The procedure for parameterization and generation of the geometric model based on parameters obtained from this model through ANSYS DesignModeler was also presented. CFD simulation based on ANSYS CFX was used to obtain the operating characteristic of the obtained centrifugal pump impeller. The authors carried out the comparison of the results of the designed model with the original one and with the optimized impeller obtained using optimization algorithms and CFD calculations.","PeriodicalId":52570,"journal":{"name":"Journal of Engineering Science","volume":"32 1-2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140489876","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}
Recycled concrete aggregate (RCA) is generated by crushing and processing concrete waste from demolition and construction activities, thereby reducing the environmental burden associated with disposing of concrete debris. The use of RCA in concrete production helps to alleviate the depletion of natural resources, as it serves as a substitute for traditional coarse and fine aggregates. This study identifies the microstructural aspects of RCA concrete, employing advanced techniques like scanning electron microscope (SEM) imaging with energydispersive spectroscopy (EDS) to analyze the microstructure and chemical composition of recycled concrete. The detailed microstructural analysis is anticipated to elucidate how the RCA content influences the interfacial transition zone, bond strength, and overall concrete performance. RCA exhibits a unique microstructure due to the presence of attached old mortar, which can influence the overall performance of RCA concrete. This study also explores the utilization of 100% RCA in preparing recycled concrete, comparing it with old and ordinary new concrete. The focus is on microstructural properties, hydration products, and the Interfacial Transition Zone (ITZ) between cement paste and aggregates. Samples were collected from a 47-year-old building, separating aggregates into different grades. Recycled coarse aggregates and recycled fine aggregates were obtained, and natural aggregates were collected. Concrete mixes for recycled and natural concrete were designed for a test strength of C30. Concrete cylinders were tested for compressive strength at 7, 28, and 90 days. Old concrete exhibited a dense microstructure with well-formed C-S-H gels, contributing to its superior strength. Recycled concrete, however, showed a wider and less dense ITZ, resulting in a more porous microstructure. EDS spectra confirmed C-S-H gel as the primary hydration product in all mixes, with the Ca/Si ratio varying, indicating complexity in hydrated product formation. The research highlights differences in microstructural and chemical characteristics among old concrete, ordinary new concrete, and recycled concrete. The wider ITZ and more porous microstructure in recycled concrete contribute to reduced strength. These findings provide insights into sustainable construction practices, promoting the use of recycled materials and addressing environmental challenges in the construction industry. As the construction industry continues to embrace sustainability, further research into the properties, performance, and best practices for incorporating RCA into concrete will play a pivotal role in advancing eco-friendly construction methodologies. Journal of Engineering Science 14(2), 2023, 145-155
{"title":"Micro-Characterization of Recycled Concrete Aggregate","authors":"Muhaiminul Islam Alim, Kazi Abm Mohiuddin","doi":"10.3329/jes.v14i2.71238","DOIUrl":"https://doi.org/10.3329/jes.v14i2.71238","url":null,"abstract":"Recycled concrete aggregate (RCA) is generated by crushing and processing concrete waste from demolition and construction activities, thereby reducing the environmental burden associated with disposing of concrete debris. The use of RCA in concrete production helps to alleviate the depletion of natural resources, as it serves as a substitute for traditional coarse and fine aggregates. This study identifies the microstructural aspects of RCA concrete, employing advanced techniques like scanning electron microscope (SEM) imaging with energydispersive spectroscopy (EDS) to analyze the microstructure and chemical composition of recycled concrete. The detailed microstructural analysis is anticipated to elucidate how the RCA content influences the interfacial transition zone, bond strength, and overall concrete performance. RCA exhibits a unique microstructure due to the presence of attached old mortar, which can influence the overall performance of RCA concrete. This study also explores the utilization of 100% RCA in preparing recycled concrete, comparing it with old and ordinary new concrete. The focus is on microstructural properties, hydration products, and the Interfacial Transition Zone (ITZ) between cement paste and aggregates. Samples were collected from a 47-year-old building, separating aggregates into different grades. Recycled coarse aggregates and recycled fine aggregates were obtained, and natural aggregates were collected. Concrete mixes for recycled and natural concrete were designed for a test strength of C30. Concrete cylinders were tested for compressive strength at 7, 28, and 90 days. Old concrete exhibited a dense microstructure with well-formed C-S-H gels, contributing to its superior strength. Recycled concrete, however, showed a wider and less dense ITZ, resulting in a more porous microstructure. EDS spectra confirmed C-S-H gel as the primary hydration product in all mixes, with the Ca/Si ratio varying, indicating complexity in hydrated product formation. The research highlights differences in microstructural and chemical characteristics among old concrete, ordinary new concrete, and recycled concrete. The wider ITZ and more porous microstructure in recycled concrete contribute to reduced strength. These findings provide insights into sustainable construction practices, promoting the use of recycled materials and addressing environmental challenges in the construction industry. As the construction industry continues to embrace sustainability, further research into the properties, performance, and best practices for incorporating RCA into concrete will play a pivotal role in advancing eco-friendly construction methodologies.\u0000Journal of Engineering Science 14(2), 2023, 145-155","PeriodicalId":52570,"journal":{"name":"Journal of Engineering Science","volume":"176 3-4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140490155","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}
Rabeya Sultana Mim, Md Ibrahim Hossain Mollah, Rakhi Kundu, N. T. Tonu, Md Mahfujul Hasan, Md Saddam Hossain, Mohammad Abu Yousuf, P. Ahamed
In this study, MnO2 as well as core@shell type MnO2@Ag material were prepared through the versatile reverse micelle route. FTIR absorption band at 522 cm-1 was ascribed to the Mn-O stretching mode, demonstrating the presence of a Mn-O bond inside the MnO2 structure. XRD was used to determine the crystalline structure of the prepared samples. Peaks at 2θ = 12.7°, 18.1°, 28.8°, 37.5°, 42.1°, 49.9°, 56.2°, and 60.3° matched the α-MnO2 diffraction peaks nicely. The spherical shape of the produced MnO2 and MnO2@Ag compounds was observed in FESEM. The results of the histogram show that MnO2@Ag particles are marginally smaller than MnO2 particles. The electrochemical assessment of the generated cathode materials for aqueous zinc-ion battery (AZIB) CR-2032 was conducted using cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and battery charge-discharge (BCD) techniques. Journal of Engineering Science 14(2), 2023, 69-77
{"title":"Manganese Oxide Based Core@Shell Nanoparticles and Its Application in Aqueous Zinc-Ion Battery","authors":"Rabeya Sultana Mim, Md Ibrahim Hossain Mollah, Rakhi Kundu, N. T. Tonu, Md Mahfujul Hasan, Md Saddam Hossain, Mohammad Abu Yousuf, P. Ahamed","doi":"10.3329/jes.v14i2.71229","DOIUrl":"https://doi.org/10.3329/jes.v14i2.71229","url":null,"abstract":"In this study, MnO2 as well as core@shell type MnO2@Ag material were prepared through the versatile reverse micelle route. FTIR absorption band at 522 cm-1 was ascribed to the Mn-O stretching mode, demonstrating the presence of a Mn-O bond inside the MnO2 structure. XRD was used to determine the crystalline structure of the prepared samples. Peaks at 2θ = 12.7°, 18.1°, 28.8°, 37.5°, 42.1°, 49.9°, 56.2°, and 60.3° matched the α-MnO2 diffraction peaks nicely. The spherical shape of the produced MnO2 and MnO2@Ag compounds was observed in FESEM. The results of the histogram show that MnO2@Ag particles are marginally smaller than MnO2 particles. The electrochemical assessment of the generated cathode materials for aqueous zinc-ion battery (AZIB) CR-2032 was conducted using cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and battery charge-discharge (BCD) techniques.\u0000Journal of Engineering Science 14(2), 2023, 69-77","PeriodicalId":52570,"journal":{"name":"Journal of Engineering Science","volume":"29 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140487948","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 : 2024-01-29DOI: 10.52326/jes.utm.2023.30(4).11
Daniela Cojocari, A. Ghendov-Moșanu, R. Sturza
The increase in the resistance of microorganisms to chemical substances and conventional drugs presents a serious and obvious problem worldwide, which has determined numerous researches aimed at the identification of new biocides with extended activity. Plants and their derivatives contain a wide variety of secondary metabolites that can inhibit or slow down the growth of bacteria, yeasts and molds. The microbiostatic activity of some berries represents a promising source of alternative solutions for their use in order to reduce the microbial contamination of raw materials and food products. The article elucidates the in vitro microbiostatic and microbicidal effects of some berries and grape marc rich in phenolic compounds with microorganisms that cause food spoilage: Staphylococcus aureus, Escherichia coli and Klebsiella pneumoniae. The composition of the extracts is examined, and possible mechanisms of antimicrobial action are analyzed.
{"title":"BERRY AND GRAPE METABOLITES FOR ANTIMICROBIAL APPLICATIONS AGAINST FOODBORNE BACTERIAL PATHOGENS","authors":"Daniela Cojocari, A. Ghendov-Moșanu, R. Sturza","doi":"10.52326/jes.utm.2023.30(4).11","DOIUrl":"https://doi.org/10.52326/jes.utm.2023.30(4).11","url":null,"abstract":"The increase in the resistance of microorganisms to chemical substances and conventional drugs presents a serious and obvious problem worldwide, which has determined numerous researches aimed at the identification of new biocides with extended activity. Plants and their derivatives contain a wide variety of secondary metabolites that can inhibit or slow down the growth of bacteria, yeasts and molds. The microbiostatic activity of some berries represents a promising source of alternative solutions for their use in order to reduce the microbial contamination of raw materials and food products. The article elucidates the in vitro microbiostatic and microbicidal effects of some berries and grape marc rich in phenolic compounds with microorganisms that cause food spoilage: Staphylococcus aureus, Escherichia coli and Klebsiella pneumoniae. The composition of the extracts is examined, and possible mechanisms of antimicrobial action are analyzed.","PeriodicalId":52570,"journal":{"name":"Journal of Engineering Science","volume":"21 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140489272","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 : 2023-11-02DOI: 10.52326/jes.utm.2023.30(3).04
Oleg Petrov
The lithium-ion (Li-ion) battery is widely used in modern electronics, serves as a power source in electric vehicles and for energy storage in renewable energy systems. The strengths of Li-ion batteries are their high energy density. Modern Li-ion batteries can include arrays of cells, the lifetime of which is determined by factors that depend on charge-discharge characteristics. Li-ion batteries connected in series have different aging rates due to different capacities. The capacity deviation increases as the battery has been used, generating an increase in compensation current, which continues to increase until ignition. To solve this problem, a pulse device and a charging method in a charge equalization battery were proposed in this paper. A numerical simulation of how to charge real Porsche Taycan car batteries was performed. The results obtained confirmed the effectiveness, the energy losses did not exceed 2% of the battery capacity. A bench diagram was developed for studying and programming the operating modes of battery control units for hybrid and electric cars.
{"title":"DIRECTING THE UNIFORMITY OF THE LEVEL OF PULSE CHARGING OF LI-ION BATTERIES USED IN AUTOMOTIVE INDUSTRY","authors":"Oleg Petrov","doi":"10.52326/jes.utm.2023.30(3).04","DOIUrl":"https://doi.org/10.52326/jes.utm.2023.30(3).04","url":null,"abstract":"The lithium-ion (Li-ion) battery is widely used in modern electronics, serves as a power source in electric vehicles and for energy storage in renewable energy systems. The strengths of Li-ion batteries are their high energy density. Modern Li-ion batteries can include arrays of cells, the lifetime of which is determined by factors that depend on charge-discharge characteristics. Li-ion batteries connected in series have different aging rates due to different capacities. The capacity deviation increases as the battery has been used, generating an increase in compensation current, which continues to increase until ignition. To solve this problem, a pulse device and a charging method in a charge equalization battery were proposed in this paper. A numerical simulation of how to charge real Porsche Taycan car batteries was performed. The results obtained confirmed the effectiveness, the energy losses did not exceed 2% of the battery capacity. A bench diagram was developed for studying and programming the operating modes of battery control units for hybrid and electric cars.","PeriodicalId":52570,"journal":{"name":"Journal of Engineering Science","volume":"97 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135933329","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 : 2023-11-02DOI: 10.52326/jes.utm.2023.30(3).08
Zsombor Boromisza, Olga Harea
The European shallow lakes used primarily for tourism are subjected to a large amount of environmental pressure, and climate change is adding new problems and aspects to them: a complex analysis of processes and connections is necessary to make appropriate decisions and strategies. In this reseach research, using literature review and precedent analysis, it has been reviewed the climate risk of a Central European lake, as well as the natural conditions and landscape change processes determining its sensitivity. It was analysed the ecological and economic effects of the record low water levels of 2021-22, focusing on processes. It was determined which of the current land uses can be considered risky or sensitive in terms of climate change. It was found that natural processes are uniformly leading towards pre-regulation character, low water levels facilitating the regeneration of flora and fauna. However, the dominant land use is dependent on artificially elevated water levels, and therefore serious economic problems have arisen. Beaches, bathing, and angling tourism are the most vulnerable to climate change.
{"title":"CLIMATE RISK OF SHALLOW TOURISTIC LAKES: A CASE STUDY OF LAKE VELENCE (HUNGARY)","authors":"Zsombor Boromisza, Olga Harea","doi":"10.52326/jes.utm.2023.30(3).08","DOIUrl":"https://doi.org/10.52326/jes.utm.2023.30(3).08","url":null,"abstract":"The European shallow lakes used primarily for tourism are subjected to a large amount of environmental pressure, and climate change is adding new problems and aspects to them: a complex analysis of processes and connections is necessary to make appropriate decisions and strategies. In this reseach research, using literature review and precedent analysis, it has been reviewed the climate risk of a Central European lake, as well as the natural conditions and landscape change processes determining its sensitivity. It was analysed the ecological and economic effects of the record low water levels of 2021-22, focusing on processes. It was determined which of the current land uses can be considered risky or sensitive in terms of climate change. It was found that natural processes are uniformly leading towards pre-regulation character, low water levels facilitating the regeneration of flora and fauna. However, the dominant land use is dependent on artificially elevated water levels, and therefore serious economic problems have arisen. Beaches, bathing, and angling tourism are the most vulnerable to climate change.","PeriodicalId":52570,"journal":{"name":"Journal of Engineering Science","volume":"102 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135933447","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 : 2023-11-02DOI: 10.52326/jes.utm.2023.30(3).01
Silvia Andronic, Ionel Sanduleac
This research paper focuses on investigating the metal-insulator transition occurring in quasi-one-dimensional organic crystals of TTT(TCNQ)2. The study utilizes a 3D approximation approach and introduces a physical model that incorporates two essential electron-phonon interactions. The first interaction is akin to the deformation potential, while the second interaction follows a polaron type behavior. By employing the random phase approximation, the renormalized phonon spectrum is calculated across different temperatures and various values of the dimensionless Fermi momentum kF. The findings indicate that the transition exhibits characteristics of the Peierls type, and the critical temperature associated with the Peierls transition is determined. Furthermore, an interesting observation is made that the Peierls critical temperature experiences a notable decrease with an increase in carrier concentration.
{"title":"ANALYSIS OF PHONONS BEHAVIOR IN QUASI-ONE-DIMENSIONAL CRYSTALS OF TTT(TCNQ)2 NEAR THE PEIERLS STRUCTURAL TRANSITION IN A 3D APPROXIMATION","authors":"Silvia Andronic, Ionel Sanduleac","doi":"10.52326/jes.utm.2023.30(3).01","DOIUrl":"https://doi.org/10.52326/jes.utm.2023.30(3).01","url":null,"abstract":"This research paper focuses on investigating the metal-insulator transition occurring in quasi-one-dimensional organic crystals of TTT(TCNQ)2. The study utilizes a 3D approximation approach and introduces a physical model that incorporates two essential electron-phonon interactions. The first interaction is akin to the deformation potential, while the second interaction follows a polaron type behavior. By employing the random phase approximation, the renormalized phonon spectrum is calculated across different temperatures and various values of the dimensionless Fermi momentum kF. The findings indicate that the transition exhibits characteristics of the Peierls type, and the critical temperature associated with the Peierls transition is determined. Furthermore, an interesting observation is made that the Peierls critical temperature experiences a notable decrease with an increase in carrier concentration.","PeriodicalId":52570,"journal":{"name":"Journal of Engineering Science","volume":"102 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135933446","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}
An environmentally ecological approach to the reuse of agro-industrial products in the food industry involves extracting biologically active substances or using them as supplementary products rich in dietary fibers. Apple pomace obtained after juice extraction presents a product rich in biologically active substances, soluble and insoluble fibers, organic acids, and minerals. Convective drying of apple pomace is an alternative method for long-term preservation by maintaining the biologically active substances. The research aimed to study the influence of temperature in the range of 60-80 °C on the drying of apple pomace to a final moisture content of 12.0±0.13% using the convective method, and the effect of temperature on the yield of bioactive compounds and antioxidant activity in Gold Delicious apple pomace. Changing the air temperature during convective drying from 60 to 80 °C reduced the drying time by 1.6 times and demonstrated a 1.4-fold increase in drying rate. The increase in the thermal agent's temperature led to an increase in the kinetic characteristic values; KI values increased by 4%, and KII values increased by 44%. Spectrophotometric analysis demonstrated that apple pomace dried at a temperature of 70 °C had the highest total content of polyphenols, tannins, and carotenoids. Thus, the convective drying method of apple pomace in the temperature range of 60-80 °C exerts a significant influence on the composition of biologically active compounds in the apple pomace composition.
{"title":"INFLUENCE OF THE HEATING AGENT TEMPERATURE ON THE KINETICS OF THE CONVECTIVE DRYING PROCESS AND THE CONTENT OF BIOACTIVE COMPOUNDS IN APPLE POMACE","authors":"Tatiana Ceșko, Galina Dicusar, Rodica Sturza, Aliona Ghendov-Moșanu","doi":"10.52326/jes.utm.2023.30(3).09","DOIUrl":"https://doi.org/10.52326/jes.utm.2023.30(3).09","url":null,"abstract":"An environmentally ecological approach to the reuse of agro-industrial products in the food industry involves extracting biologically active substances or using them as supplementary products rich in dietary fibers. Apple pomace obtained after juice extraction presents a product rich in biologically active substances, soluble and insoluble fibers, organic acids, and minerals. Convective drying of apple pomace is an alternative method for long-term preservation by maintaining the biologically active substances. The research aimed to study the influence of temperature in the range of 60-80 °C on the drying of apple pomace to a final moisture content of 12.0±0.13% using the convective method, and the effect of temperature on the yield of bioactive compounds and antioxidant activity in Gold Delicious apple pomace. Changing the air temperature during convective drying from 60 to 80 °C reduced the drying time by 1.6 times and demonstrated a 1.4-fold increase in drying rate. The increase in the thermal agent's temperature led to an increase in the kinetic characteristic values; KI values increased by 4%, and KII values increased by 44%. Spectrophotometric analysis demonstrated that apple pomace dried at a temperature of 70 °C had the highest total content of polyphenols, tannins, and carotenoids. Thus, the convective drying method of apple pomace in the temperature range of 60-80 °C exerts a significant influence on the composition of biologically active compounds in the apple pomace composition.","PeriodicalId":52570,"journal":{"name":"Journal of Engineering Science","volume":"97 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135933328","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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