Arailym Kamal, Aliya Satayeva, Bakhyt Aubakirova, Zhandos Tauanov, Jong Kim, Stavros G. Poulopoulos, Elizabeth Arkhangelsky
This work was focusing on the territories with low/no info available, i.e. we studied sources, fate, monitoring, and negative effects of pharmaceuticals in Kazakhstan and bordering CIS countries, and compared it with the global data.
{"title":"Medical Substances in Environmental Systems of the Central Asia Region","authors":"Arailym Kamal, Aliya Satayeva, Bakhyt Aubakirova, Zhandos Tauanov, Jong Kim, Stavros G. Poulopoulos, Elizabeth Arkhangelsky","doi":"10.30919/es978","DOIUrl":"https://doi.org/10.30919/es978","url":null,"abstract":"This work was focusing on the territories with low/no info available, i.e. we studied sources, fate, monitoring, and negative effects of pharmaceuticals in Kazakhstan and bordering CIS countries, and compared it with the global data.","PeriodicalId":36059,"journal":{"name":"Engineered Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136205882","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}
{"title":"Exploring Point Defects in Rb2O via First-Principles Calculations","authors":"Saleel Ahammad Saleel V. P., Etjiraj R","doi":"10.30919/es925","DOIUrl":"https://doi.org/10.30919/es925","url":null,"abstract":"","PeriodicalId":36059,"journal":{"name":"Engineered Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72687638","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}
Peyman Roodgar Saffari, Sayan Sirimontree, C. Thongchom, T. Jearsiripongkul, P. R. Saffari, S. Keawsawasvong, Suphanut Kongwat
In the present study, free and forced vibration analysis of sandwich smart magneto-electro-elastic (MEE) nanoplates with functionally graded material porous (FGMP) of linearly or parabolically varying thickness core layer under initial external electric and magnetic potentials is studied using the first-order shear deformation theory (FSDT) and nonlocal strain gradient theory (NSGT). NSGT is perfected with softening and hardening material effects, which can significantly improve the precision of results. Three states of porosity distribution patterns, i
{"title":"Free and Forced Vibration of Sandwich FGM Porous Variable Thickness Nanoplates Integrated with Magneto-Electro-Elastic Layers Via Nonlocal Strain Gradient Theory","authors":"Peyman Roodgar Saffari, Sayan Sirimontree, C. Thongchom, T. Jearsiripongkul, P. R. Saffari, S. Keawsawasvong, Suphanut Kongwat","doi":"10.30919/es918","DOIUrl":"https://doi.org/10.30919/es918","url":null,"abstract":"In the present study, free and forced vibration analysis of sandwich smart magneto-electro-elastic (MEE) nanoplates with functionally graded material porous (FGMP) of linearly or parabolically varying thickness core layer under initial external electric and magnetic potentials is studied using the first-order shear deformation theory (FSDT) and nonlocal strain gradient theory (NSGT). NSGT is perfected with softening and hardening material effects, which can significantly improve the precision of results. Three states of porosity distribution patterns, i","PeriodicalId":36059,"journal":{"name":"Engineered Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79639544","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}
{"title":"An Electro-Mechanical Coupled Model for 3D Printed Piezoelectrets: Development, Validation, and Prediction","authors":"Xiaolin Wang, Zhe Liu, Hui Wang, C. Zeng","doi":"10.30919/es899","DOIUrl":"https://doi.org/10.30919/es899","url":null,"abstract":"","PeriodicalId":36059,"journal":{"name":"Engineered Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73879303","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}
The corroded metals in the world account for about 1/3 of the total every year. How to prevent metal corrosion has become a major research topic in the scientific community. Although traditional chromate passivation, phosphate conversion and other technologies can solve the corrosion problem of metals, they pollute the environment and pose a threat to human health. It is urgent to develop new green metal surface treatment technology. The unique chemical structure of silane can form a good protective layer on the metal surface and play an anti-corrosion effect, so the metal surface silanization technology is considered to be the most ideal alternative technology to prevent metal corrosion. Silane passivation solution prepared by organosilicone resin and polyurethane resin mixed with a small amount of metal ions has been used in corrosion prevention of many metals and metal alloys. This study aimed to evaluate the effect of metal ions on the anticorrosion properties of a passivation solution, which contains polyurethane resin and amino silicone resin. Zn 2+ , Cu 2+ , and Ni 2+ were separately added to the passivation solution. This solution was coated on a steel surface using a dip-coating method, and the coated samples were then exposed to 3.5 wt% NaCl solutions for several days. Scanning electron microscopy, thermogravimetric analysis, Fourier transform–infrared spectroscopy, ultraviolet, and electrochemical impedance spectroscopy techniques were conducted to investigate the morphological properties and corrosion resistance of the coatings. The results showed that the types of metal ions were important parameters that affected the corrosion resistance of the coatings. The passivation solution mixed with Zn 2+ showed better corrosion resistance than that mixed with Cu 2+ and Ni 2+ .
{"title":"Evaluation of the Anticorrosion Properties of Passivation Solution Containing Different Metal Ions Coated on a Steel Surface","authors":"Ying Xu, L. Yu, Yue Chen, Yu-Ze Tian, Chunlin Liu, Junqi Wang, Guangzhen Liu, Yu-Liang Bai, Chengxin Guo, Jingchun Liu, Putao Zhang","doi":"10.30919/es917","DOIUrl":"https://doi.org/10.30919/es917","url":null,"abstract":"The corroded metals in the world account for about 1/3 of the total every year. How to prevent metal corrosion has become a major research topic in the scientific community. Although traditional chromate passivation, phosphate conversion and other technologies can solve the corrosion problem of metals, they pollute the environment and pose a threat to human health. It is urgent to develop new green metal surface treatment technology. The unique chemical structure of silane can form a good protective layer on the metal surface and play an anti-corrosion effect, so the metal surface silanization technology is considered to be the most ideal alternative technology to prevent metal corrosion. Silane passivation solution prepared by organosilicone resin and polyurethane resin mixed with a small amount of metal ions has been used in corrosion prevention of many metals and metal alloys. This study aimed to evaluate the effect of metal ions on the anticorrosion properties of a passivation solution, which contains polyurethane resin and amino silicone resin. Zn 2+ , Cu 2+ , and Ni 2+ were separately added to the passivation solution. This solution was coated on a steel surface using a dip-coating method, and the coated samples were then exposed to 3.5 wt% NaCl solutions for several days. Scanning electron microscopy, thermogravimetric analysis, Fourier transform–infrared spectroscopy, ultraviolet, and electrochemical impedance spectroscopy techniques were conducted to investigate the morphological properties and corrosion resistance of the coatings. The results showed that the types of metal ions were important parameters that affected the corrosion resistance of the coatings. The passivation solution mixed with Zn 2+ showed better corrosion resistance than that mixed with Cu 2+ and Ni 2+ .","PeriodicalId":36059,"journal":{"name":"Engineered Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87455120","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}
{"title":"Emergency Controlling Scheme for Damping the Inter-Area Oscillation based on Estimating Critical Inter-area Angle","authors":"S. Ranjbar","doi":"10.30919/es892","DOIUrl":"https://doi.org/10.30919/es892","url":null,"abstract":"(R2-C2","PeriodicalId":36059,"journal":{"name":"Engineered Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88925615","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}
Md. Anwar Hossain, S. Akhter, M. Sohrab, F. Afroz, M. Begum, Satyajit Roy Rony
In this research work, the response surface approach was constructed on a central composite design (CCD) and was applied to control optimization for antioxidant elements extraction from Justicia adhatoda shrubberies. Two extraction parameters were assessed in 14 experimental trials as methanol: water (30% to 80%) and the extraction time (4 to 6 days). The quadratic polynomial equation of multiple regression analysis forecasts the extraction process's optimization. The maximum antioxidant extract (AE) was obtained at methanol (55%) and time (6.41 days) 6.48 g/100g on trial 09. The minimum radical scavenging activity (IC 50 ) values were obtained at methanol (55%) and extraction time of 3.59 days on trial 08. It was found that the AE yields and radical scavenging activity (IC 50 ) of Justicia adhatoda leaves could be optimized at 6.62 g/100g and 1.66 μg/mL at the optimum condition at a time of 6.41 days and solvent concentration of 76.01% with overall desirability 0.96. According to the response optimizer method, the conditions that maximize the yield and minimize the DPPH are within the established restrictions. The well-fitted actual values to predicted values validate the regression model acceptability. Antioxidant properties of Justicia adhatoda leaves using response surface methodology (RSM) confirm this technique's usefulness.
{"title":"Applying an Optimization Technique for the Extraction of Antioxidant Components from Justicia adhatoda Leaves","authors":"Md. Anwar Hossain, S. Akhter, M. Sohrab, F. Afroz, M. Begum, Satyajit Roy Rony","doi":"10.30919/es913","DOIUrl":"https://doi.org/10.30919/es913","url":null,"abstract":"In this research work, the response surface approach was constructed on a central composite design (CCD) and was applied to control optimization for antioxidant elements extraction from Justicia adhatoda shrubberies. Two extraction parameters were assessed in 14 experimental trials as methanol: water (30% to 80%) and the extraction time (4 to 6 days). The quadratic polynomial equation of multiple regression analysis forecasts the extraction process's optimization. The maximum antioxidant extract (AE) was obtained at methanol (55%) and time (6.41 days) 6.48 g/100g on trial 09. The minimum radical scavenging activity (IC 50 ) values were obtained at methanol (55%) and extraction time of 3.59 days on trial 08. It was found that the AE yields and radical scavenging activity (IC 50 ) of Justicia adhatoda leaves could be optimized at 6.62 g/100g and 1.66 μg/mL at the optimum condition at a time of 6.41 days and solvent concentration of 76.01% with overall desirability 0.96. According to the response optimizer method, the conditions that maximize the yield and minimize the DPPH are within the established restrictions. The well-fitted actual values to predicted values validate the regression model acceptability. Antioxidant properties of Justicia adhatoda leaves using response surface methodology (RSM) confirm this technique's usefulness.","PeriodicalId":36059,"journal":{"name":"Engineered Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90868080","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}
S. Kumar, J. Vanualailai, B. Sharma, Avinesh Prasad, Ravinesh Chand
. Abstract To guarantee navigation accuracy, the robotic applications utilize landmarks. This paper proposes a novel nonlinear switched system for the fundamental motion planning problem in autonomous mobile robot navigation: the generation of continuous collision-free paths to a goal configuration via numerous landmarks (waypoints) in a cluttered environment. The proposed system leverages the Lyapunov-based control scheme (LbCS) and constructs Lyapunov-like functions for the system’s subsystems. These functions guide a planar point-mass object, representing an autonomous robotic agent, towards its goal by utilizing artificial landmarks. Extracting a set of nonlinear, time-invariant, continuous, and stabilizing switched velocity controllers from these Lyapunov-like functions, the system invokes the controllers based on a switching rule, enabling hierarchical landmark navigation in complex environments. Using the well-known stability criteria by Branicky for switched systems based on multiple Lyapunov functions, the stability of the proposed system is provided. A new method to extract action landmarks from multiple landmarks is also introduced. The con-trol laws are then used to control the motion of a nonholonomic car-like vehicle governed by its kinematic equations. Numerical examples with simulations illustrate the effectiveness of the Lyapunov-based control laws. The proposed
{"title":"A Stable Nonlinear Switched System for Landmark-aided Motion Planning","authors":"S. Kumar, J. Vanualailai, B. Sharma, Avinesh Prasad, Ravinesh Chand","doi":"10.30919/es919","DOIUrl":"https://doi.org/10.30919/es919","url":null,"abstract":". Abstract To guarantee navigation accuracy, the robotic applications utilize landmarks. This paper proposes a novel nonlinear switched system for the fundamental motion planning problem in autonomous mobile robot navigation: the generation of continuous collision-free paths to a goal configuration via numerous landmarks (waypoints) in a cluttered environment. The proposed system leverages the Lyapunov-based control scheme (LbCS) and constructs Lyapunov-like functions for the system’s subsystems. These functions guide a planar point-mass object, representing an autonomous robotic agent, towards its goal by utilizing artificial landmarks. Extracting a set of nonlinear, time-invariant, continuous, and stabilizing switched velocity controllers from these Lyapunov-like functions, the system invokes the controllers based on a switching rule, enabling hierarchical landmark navigation in complex environments. Using the well-known stability criteria by Branicky for switched systems based on multiple Lyapunov functions, the stability of the proposed system is provided. A new method to extract action landmarks from multiple landmarks is also introduced. The con-trol laws are then used to control the motion of a nonholonomic car-like vehicle governed by its kinematic equations. Numerical examples with simulations illustrate the effectiveness of the Lyapunov-based control laws. The proposed","PeriodicalId":36059,"journal":{"name":"Engineered Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91184130","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}
{"title":"A comprehensive review on sustainable metal recovery from E-waste based on Physiochemical and Biotechnological methods","authors":"Navashree Nagarajan, Parthasarathy Panchatcharam2","doi":"10.30919/es8d844","DOIUrl":"https://doi.org/10.30919/es8d844","url":null,"abstract":"","PeriodicalId":36059,"journal":{"name":"Engineered Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91230366","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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