{"title":"Extending Weber's Electrodynamics to High Velocity Particles","authors":"Li Qingsong","doi":"10.35840/2631-5068/6540","DOIUrl":"https://doi.org/10.35840/2631-5068/6540","url":null,"abstract":"","PeriodicalId":301924,"journal":{"name":"International Journal of Magnetics and Electromagnetism","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131266983","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":"Magnetic Monopole Interaction with a Magnetic Sphere","authors":"Alarki R, P. D","doi":"10.35840/2631-5068/6538","DOIUrl":"https://doi.org/10.35840/2631-5068/6538","url":null,"abstract":"","PeriodicalId":301924,"journal":{"name":"International Journal of Magnetics and Electromagnetism","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127938238","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":"Electric Field Theory Based on Weber's Electrodynamics","authors":"Li Qingsong","doi":"10.35840/2631-5068/6539","DOIUrl":"https://doi.org/10.35840/2631-5068/6539","url":null,"abstract":"","PeriodicalId":301924,"journal":{"name":"International Journal of Magnetics and Electromagnetism","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121453257","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":"Signal Noise Ratio and Magnetic Density in Digital Magnetic Recording System: Analytical and Numerical Investigation","authors":"Tefouet Joseph D Noula, Yemele David","doi":"10.35840/2631-5068/6534","DOIUrl":"https://doi.org/10.35840/2631-5068/6534","url":null,"abstract":"","PeriodicalId":301924,"journal":{"name":"International Journal of Magnetics and Electromagnetism","volume":"100 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115823145","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}
Active magnetic bearings (AMBs) have attracted a lot of attention due to their various advantages from its noncontact and actively controlled features. The challenges of the further wide spread of AMBs include the extensive knowledge required in designing the complex system and thus the high design cost. Multi-objective Optimization solves this challenge by providing AMB designers multiple solutions to achieve the best compromised objectives. Different optimization techniques and their applications onto AMBs are summarized. Future trends of AMBs supported system optimization are also discussed.
{"title":"A Review of Active Magnetic Bearings Supported Systems Optimization Design","authors":"Zhong Wan","doi":"10.35840/2631-5068/6527","DOIUrl":"https://doi.org/10.35840/2631-5068/6527","url":null,"abstract":"Active magnetic bearings (AMBs) have attracted a lot of attention due to their various advantages from its noncontact and actively controlled features. The challenges of the further wide spread of AMBs include the extensive knowledge required in designing the complex system and thus the high design cost. Multi-objective Optimization solves this challenge by providing AMB designers multiple solutions to achieve the best compromised objectives. Different optimization techniques and their applications onto AMBs are summarized. Future trends of AMBs supported system optimization are also discussed.","PeriodicalId":301924,"journal":{"name":"International Journal of Magnetics and Electromagnetism","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125270893","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}
M. R. N. Astudillo, Nicolás Núñez, Isabel López Pumarega, J. Ruzzante, Martín Gómez
Barkhausen Magnetic Noise (MBN) and Magnetic Acoustic Emission (MAE) are phenomena that occur in ferromagnetic materials which undergo changes in their magnetization. These phenomena are very sensitive to changes on microstructure and residual stresses. The MBN and MAE can be applied as monitoring techniques to detect plastic deformation in materials subjected to thermomechanical processes, such as machining and manufacturing processes. In this work, the plastic deformation in samples subjected to uniaxial tensile tests is investigated through MBN and MAE. Twelve stainless steel test pieces of two different materials (AISI 430 and AISI 441A), were tested. As a first step, in order to obtain their mechanical properties, two test pieces of each material cut in different directions with respect to the rolling direction, were tested up to rupture. The others were deformed in four stages on plastic deformation. After each stage, MBN and MAE measurements were made, in order to obtain a correlation with the strain and the magnetic situation of the materials. We present here the microstructural analyses, the study of MBN and MAE signals, correlating them with the state of deformation of the specimens.
{"title":"Evaluation of Plastic Deformation in Steels with Magnetic and Acoustic Techniques","authors":"M. R. N. Astudillo, Nicolás Núñez, Isabel López Pumarega, J. Ruzzante, Martín Gómez","doi":"10.35840/2631-5068/6524","DOIUrl":"https://doi.org/10.35840/2631-5068/6524","url":null,"abstract":"Barkhausen Magnetic Noise (MBN) and Magnetic Acoustic Emission (MAE) are phenomena that occur in ferromagnetic materials which undergo changes in their magnetization. These phenomena are very sensitive to changes on microstructure and residual stresses. The MBN and MAE can be applied as monitoring techniques to detect plastic deformation in materials subjected to thermomechanical processes, such as machining and manufacturing processes. In this work, the plastic deformation in samples subjected to uniaxial tensile tests is investigated through MBN and MAE. Twelve stainless steel test pieces of two different materials (AISI 430 and AISI 441A), were tested. As a first step, in order to obtain their mechanical properties, two test pieces of each material cut in different directions with respect to the rolling direction, were tested up to rupture. The others were deformed in four stages on plastic deformation. After each stage, MBN and MAE measurements were made, in order to obtain a correlation with the strain and the magnetic situation of the materials. We present here the microstructural analyses, the study of MBN and MAE signals, correlating them with the state of deformation of the specimens.","PeriodicalId":301924,"journal":{"name":"International Journal of Magnetics and Electromagnetism","volume":"242 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132620480","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}
González-Teodoro Jorge Rafael, Romero Enrique, A. Rafael
There are two principal methods are utilized to estimate the core power loss (CPL) in magnetic components: Empirical equations and hysteresis models. Both approaches need an anterior test or analysis to calculate the CPL. Most of them are based on improved Steinmetz equations. Tests are usually costly or the number of necessary tests is excessive for the component design development. 2D analyses using Finite Element are not good enough for several magnetic components for their lack of symmetries. Non-symmetric magnetic cores are ones of the most common components in transformers and power converters and they don’t have symmetries on the magnetic field distribution and only 3D models are competent to take account all the effects and phenomena.
{"title":"Review of Core Power Loss Analysis Using Finite Element Methods","authors":"González-Teodoro Jorge Rafael, Romero Enrique, A. Rafael","doi":"10.35840/2631-5068/6523","DOIUrl":"https://doi.org/10.35840/2631-5068/6523","url":null,"abstract":"There are two principal methods are utilized to estimate the core power loss (CPL) in magnetic components: Empirical equations and hysteresis models. Both approaches need an anterior test or analysis to calculate the CPL. Most of them are based on improved Steinmetz equations. Tests are usually costly or the number of necessary tests is excessive for the component design development. 2D analyses using Finite Element are not good enough for several magnetic components for their lack of symmetries. Non-symmetric magnetic cores are ones of the most common components in transformers and power converters and they don’t have symmetries on the magnetic field distribution and only 3D models are competent to take account all the effects and phenomena.","PeriodicalId":301924,"journal":{"name":"International Journal of Magnetics and Electromagnetism","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131503725","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}
Alpha-magnets present unique achromatic properties for beam instrumentation and phasespace manipulation. Nowadays they are acquiring a substantial interest for application in a rapidly growing number of facilities around the world: Free Electron Lasers, far infrared and THz sources, inverse Compton sources of ultra-bright hard X-rays. However, classic design of an alpha-magnet based on hyperbolic poles makes it dimensions large, resulting in significant weight and cost. Several magnetic designs of alpha magnets with reduced dimensions especially for low energy electron beams is considered here including very compact alpha magnets based on permanent magnets with about flat poles as well as compact electromagnetic designs with co-axis coils and substantially non-hyperbolic or truncated poles. These novel design approaches can be applied in relatively small facilities where weight and/or space are limited.
{"title":"On the Magnetic Designing of Compact Alpha-Magnets","authors":"Smirnov Alexei","doi":"10.35840/2631-5068/6522","DOIUrl":"https://doi.org/10.35840/2631-5068/6522","url":null,"abstract":"Alpha-magnets present unique achromatic properties for beam instrumentation and phasespace manipulation. Nowadays they are acquiring a substantial interest for application in a rapidly growing number of facilities around the world: Free Electron Lasers, far infrared and THz sources, inverse Compton sources of ultra-bright hard X-rays. However, classic design of an alpha-magnet based on hyperbolic poles makes it dimensions large, resulting in significant weight and cost. Several magnetic designs of alpha magnets with reduced dimensions especially for low energy electron beams is considered here including very compact alpha magnets based on permanent magnets with about flat poles as well as compact electromagnetic designs with co-axis coils and substantially non-hyperbolic or truncated poles. These novel design approaches can be applied in relatively small facilities where weight and/or space are limited.","PeriodicalId":301924,"journal":{"name":"International Journal of Magnetics and Electromagnetism","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128172047","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}
We investigate a classical notion denoted as ‘Motional impedance (Zmot)’ first developed by Kennelly in 1912, then explored by many other researchers early in the 20th century. Due to long history to establish impedance properties, Zmot has not been clearly understood with respect to classical impedance properties which makes retroactive study of the Zmot worthy. In this study, we project Zmot’s unique characteristics onto anti-reciprocity where every electro-mechanical system as modeled by a gyrator. This work also clarifies that Zmot is a type of transfer impedance, thus is not necessarily to be a minimum-phase nor a Positive-Real function. Based on simulation, this study shows a shunt eddy current loss on the electrical side of the system is one possible source of the negative real part of Zmot which leads negative real part in Zmot plots. By taking a Balance Armature Receiver (BAR) as a specific example of the electro-mechanical systems, we also explore the (non)linear approximation principal of the BAR based on the magnetic force and hysteresis characteristics. We believe that this study puts anti-reciprocal physics on both the empirical and theoretical basis.
{"title":"Anti-Reciprocal Motional Impedance and its Properties","authors":"Noori Kim, J. Allen","doi":"10.35840/2631-5068/6521","DOIUrl":"https://doi.org/10.35840/2631-5068/6521","url":null,"abstract":"We investigate a classical notion denoted as ‘Motional impedance (Zmot)’ first developed by Kennelly in 1912, then explored by many other researchers early in the 20th century. Due to long history to establish impedance properties, Zmot has not been clearly understood with respect to classical impedance properties which makes retroactive study of the Zmot worthy. In this study, we project Zmot’s unique characteristics onto anti-reciprocity where every electro-mechanical system as modeled by a gyrator. This work also clarifies that Zmot is a type of transfer impedance, thus is not necessarily to be a minimum-phase nor a Positive-Real function. Based on simulation, this study shows a shunt eddy current loss on the electrical side of the system is one possible source of the negative real part of Zmot which leads negative real part in Zmot plots. By taking a Balance Armature Receiver (BAR) as a specific example of the electro-mechanical systems, we also explore the (non)linear approximation principal of the BAR based on the magnetic force and hysteresis characteristics. We believe that this study puts anti-reciprocal physics on both the empirical and theoretical basis.","PeriodicalId":301924,"journal":{"name":"International Journal of Magnetics and Electromagnetism","volume":"93 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134486900","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}
Lattice size dependency of critical temperature of Ising nanofilms and nanotubes on the square lattice have been investigated Using Cellular Automata simulation approach. The obtained values of critical temperature for single-layer nanofilm on the infinite size of lattice is equal to 2.36, the corresponding value for single-layer nanofilm on the honeycomb lattice was 1.45. The effects of length and diameter of nanotube on the critical temperature were also studied. For equal size lattices, the critical temperature values of nanotube are larger than those for nanofilm. The critical temperature of a single-layer nanotube on the infinite size lattice was calculated as 2.37. The proximity of the values for the critical temperature of nanofilm and nanotube in the infinite size of lattice reflects the fact that by increasing the length and diameter of the nanotube, its magnetic behavior tends to be as nanofilm. Such studies seems to be of particular importance in providing tabulated data on the effect of lattice size on critical temperature and magnetic behavior of magnetic nanomaterials.
{"title":"Effect of Lattice Size on the Critical Temperature of Ising Nanofilms and Nanotubes on the Square Lattice: Cellular Automata Simulation","authors":"Nabi Javadi","doi":"10.35840/2631-5068/6520","DOIUrl":"https://doi.org/10.35840/2631-5068/6520","url":null,"abstract":"Lattice size dependency of critical temperature of Ising nanofilms and nanotubes on the square lattice have been investigated Using Cellular Automata simulation approach. The obtained values of critical temperature for single-layer nanofilm on the infinite size of lattice is equal to 2.36, the corresponding value for single-layer nanofilm on the honeycomb lattice was 1.45. The effects of length and diameter of nanotube on the critical temperature were also studied. For equal size lattices, the critical temperature values of nanotube are larger than those for nanofilm. The critical temperature of a single-layer nanotube on the infinite size lattice was calculated as 2.37. The proximity of the values for the critical temperature of nanofilm and nanotube in the infinite size of lattice reflects the fact that by increasing the length and diameter of the nanotube, its magnetic behavior tends to be as nanofilm. Such studies seems to be of particular importance in providing tabulated data on the effect of lattice size on critical temperature and magnetic behavior of magnetic nanomaterials.","PeriodicalId":301924,"journal":{"name":"International Journal of Magnetics and Electromagnetism","volume":"103 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124762570","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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