Pub Date : 2023-06-28DOI: 10.31349/revmexfise.20.020212
Ananda Aprilia, H. Kuswanto, W. S. B. Dwandaru
A mini review of attitudes and beliefs toward physics has been carried out. The purpose of this study was to address aspects that influence attitudes and beliefs toward physics and various learning models that can increase attitudes and beliefs toward physics. The method used in this study was literature review. Literature review was done by searching for keywords, i.e.: attitudes towards physics and beliefs towards physics. This keyword search was done through Google Scholar, Base, and Core search engines. We have obtained 25 articles that matched the keywords and have been screened with the limitation of the year of publication, namely the last 10 years. Through this literature review it can be obtained that physics attitudes and beliefs were influenced by gender and personality, grade level, type of school, and age. Contradictions regarding aspects that influence attitudes and beliefs about physics occur in the gender aspect. Various learning methods to improve attitudes and beliefs about physics were cooperative learning models with jigsaw, Science Technology Engineering and Mathematics (STEM), concept maps, peer instruction methods, open inquiry methods, learning integrated with music, and learning using a computer simulation model.
{"title":"Attitudes and beliefs toward physics: A mini review","authors":"Ananda Aprilia, H. Kuswanto, W. S. B. Dwandaru","doi":"10.31349/revmexfise.20.020212","DOIUrl":"https://doi.org/10.31349/revmexfise.20.020212","url":null,"abstract":"A mini review of attitudes and beliefs toward physics has been carried out. The purpose of this study was to address aspects that influence attitudes and beliefs toward physics and various learning models that can increase attitudes and beliefs toward physics. The method used in this study was literature review. Literature review was done by searching for keywords, i.e.: attitudes towards physics and beliefs towards physics. This keyword search was done through Google Scholar, Base, and Core search engines. We have obtained 25 articles that matched the keywords and have been screened with the limitation of the year of publication, namely the last 10 years. Through this literature review it can be obtained that physics attitudes and beliefs were influenced by gender and personality, grade level, type of school, and age. Contradictions regarding aspects that influence attitudes and beliefs about physics occur in the gender aspect. Various learning methods to improve attitudes and beliefs about physics were cooperative learning models with jigsaw, Science Technology Engineering and Mathematics (STEM), concept maps, peer instruction methods, open inquiry methods, learning integrated with music, and learning using a computer simulation model.","PeriodicalId":49600,"journal":{"name":"Revista Mexicana De Fisica E","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46010177","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 : 2023-06-28DOI: 10.31349/revmexfise.20.020206
Ariel Mordetzki, Efrain Buksman, A. L. Fonseca de Oliveira
The HHL quantum algorithm [1] is a procedure that addresses the resolution of linear systems of equations (QLSP). Under certain conditions, the algorithm has a logarithmic order in the number of equations, better than the faster classical method. The algorithm manages to find a quantum state proportional to the solution vector, up to a normalization factor. The disadvantage is that to determine each of the coefficients of the solution vector, the algorithm’s output quantum state must be determined with additional statistical methods, thus losing its exponential advantage. There are certain types of problems in which this disadvantage can be circumvented, the statistical treatment is unavoidable, but for certain cases such as electrical circuits, in which the main interest is to find only one of the currents, (for example the load current), we only need to measure one of the qubits of the solution state. In this article we solve the linear system associated with the currents of an electrical circuit with sinusoidal voltage, using the HHL algorithm, simulated in a Scilab numerical environment. An optimized example of an electrical line transmission wave in a real computer on the IBMQ platform, is also solved
{"title":"Quantum HHL algorithm applied to electric circuit and line transmission wave","authors":"Ariel Mordetzki, Efrain Buksman, A. L. Fonseca de Oliveira","doi":"10.31349/revmexfise.20.020206","DOIUrl":"https://doi.org/10.31349/revmexfise.20.020206","url":null,"abstract":"The HHL quantum algorithm [1] is a procedure that addresses the resolution of linear systems of equations (QLSP). Under certain conditions, the algorithm has a logarithmic order in the number of equations, better than the faster classical method. The algorithm manages to find a quantum state proportional to the solution vector, up to a normalization factor. The disadvantage is that to determine each of the coefficients of the solution vector, the algorithm’s output quantum state must be determined with additional statistical methods, thus losing its exponential advantage. There are certain types of problems in which this disadvantage can be circumvented, the statistical treatment is unavoidable, but for certain cases such as electrical circuits, in which the main interest is to find only one of the currents, (for example the load current), we only need to measure one of the qubits of the solution state. In this article we solve the linear system associated with the currents of an electrical circuit with sinusoidal voltage, using the HHL algorithm, simulated in a Scilab numerical environment. An optimized example of an electrical line transmission wave in a real computer on the IBMQ platform, is also solved","PeriodicalId":49600,"journal":{"name":"Revista Mexicana De Fisica E","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44775870","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 : 2023-06-28DOI: 10.31349/revmexfise.20.020201
G. F. Torres del Castillo
We review the Feynman paradox related to the conservation of the angular momentum in systems with an electromagnetic field. We show that the angular momentum is conserved if it is adequately defined.
我们回顾了与电磁场系统中角动量守恒有关的费曼悖论。我们证明，角动量是守恒的，如果它被充分定义。
{"title":"On Feynman's paradox","authors":"G. F. Torres del Castillo","doi":"10.31349/revmexfise.20.020201","DOIUrl":"https://doi.org/10.31349/revmexfise.20.020201","url":null,"abstract":"We review the Feynman paradox related to the conservation of the angular momentum in systems with an electromagnetic field. We show that the angular momentum is conserved if it is adequately defined.","PeriodicalId":49600,"journal":{"name":"Revista Mexicana De Fisica E","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41445038","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 : 2023-06-28DOI: 10.31349/revmexfise.20.020501
D. Valenzuela, Julio César Pérez Pedraza, A. Raya
We consider the Foldy-Whouthuysen (FW) transformation of the Dirac equation coupled to a background soliton field which is equivalent to a position-dependent massm(x) such that at each limit x → ±∞, the mass to the left and to the right tends to a (possibly different) constant, with a sign difference at each side. We then build-up a third order unitarily transformed Schrödinger-like Hamiltonian as a counterpart of the corresponding to the well known Jackiw-Rebbi model. By further FW-transforming the Dirac spinor, we establish the relation between the non-relativistic and relativistic wave functions up to this order of approximation for generic position dependent mass profiles. For the economic choice m(x) = m0x/|x|, we find that these spinors are the same up to an overall constant.
{"title":"Non-relativistic representation of the Jackiw-Rebbi soliton","authors":"D. Valenzuela, Julio César Pérez Pedraza, A. Raya","doi":"10.31349/revmexfise.20.020501","DOIUrl":"https://doi.org/10.31349/revmexfise.20.020501","url":null,"abstract":"We consider the Foldy-Whouthuysen (FW) transformation of the Dirac equation coupled to a background soliton field which is equivalent to a position-dependent massm(x) such that at each limit x → ±∞, the mass to the left and to the right tends to a (possibly different) constant, with a sign difference at each side. We then build-up a third order unitarily transformed Schrödinger-like Hamiltonian as a counterpart of the corresponding to the well known Jackiw-Rebbi model. By further FW-transforming the Dirac spinor, we establish the relation between the non-relativistic and relativistic wave functions up to this order of approximation for generic position dependent mass profiles. For the economic choice m(x) = m0x/|x|, we find that these spinors are the same up to an overall constant.","PeriodicalId":49600,"journal":{"name":"Revista Mexicana De Fisica E","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48499937","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 : 2023-01-13DOI: 10.31349/revmexfise.20.010205
N. Aquino, R. A. Rojas, E. Castano
In this work we calculate the ground state energy of the hydrogen atom confined in a sphere of penetrable walls of radius Rc. Inside the sphere the system is subject to a Coulomb potential, whereas outside of it the potential is a finite constant V0. The energy is obtained as a function of Rc and V0 by means of the Rayleigh-Ritz variational method, in which, the trial function is proposed as a free particle wave function within a finite square well potential but including an exponential factor that takes into account the electron-nucleus Coulomb attraction. For an impenetrable sphere, , the energy grows fast as Rc approaches zero. On the other hand, when the height of the barrier V0 is finite, the energy increases slowly as Rc goes to zero. We also compute the Fermi contact term, nuclear magnetic screening, polarizability, pressure and tunneling as a function of Rc and V0. As expected, these physical quantities approach the corresponding values of the free hydrogen atom as Rc grows. We also discuss the pressure-induced ionization of the hydrogen atom. The present results are found in good agreement with those previously published in the literature.
{"title":"Ground state energy of the hydrogen atom inside penetrable spherical cavities; variational approach","authors":"N. Aquino, R. A. Rojas, E. Castano","doi":"10.31349/revmexfise.20.010205","DOIUrl":"https://doi.org/10.31349/revmexfise.20.010205","url":null,"abstract":"In this work we calculate the ground state energy of the hydrogen atom confined in a sphere of penetrable walls of radius Rc. Inside the sphere the system is subject to a Coulomb potential, whereas outside of it the potential is a finite constant V0. The energy is obtained as a function of Rc and V0 by means of the Rayleigh-Ritz variational method, in which, the trial function is proposed as a free particle wave function within a finite square well potential but including an exponential factor that takes into account the electron-nucleus Coulomb attraction. For an impenetrable sphere, , the energy grows fast as Rc approaches zero. On the other hand, when the height of the barrier V0 is finite, the energy increases slowly as Rc goes to zero. We also compute the Fermi contact term, nuclear magnetic screening, polarizability, pressure and tunneling as a function of Rc and V0. As expected, these physical quantities approach the corresponding values of the free hydrogen atom as Rc grows. We also discuss the pressure-induced ionization of the hydrogen atom. The present results are found in good agreement with those previously published in the literature.","PeriodicalId":49600,"journal":{"name":"Revista Mexicana De Fisica E","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44083374","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 : 2023-01-13DOI: 10.31349/revmexfise.20.010214
Aldrin Cervantes Contreras, Marco Ramirez Olvera, Lucio López Cavazos, Jose Alonso López Miranda, Adolfo Huet Soto
In this paper we determine the electromagnetic properties of a rotating charged rod, which rotates around the x-axis with an angular frequency that it’s not constant. As the charge is changing its position over time, the electromagnetic information reaches us with a certain time lag. Therefore, it is necessary to obtain the time-dependent(retarded) potentials at any point in space, for which we need multipolar expansion to determine the field at any point in space and do a Taylor expansion of the distance at which we want to measure the electromagnetic fields, in the static and induction zone. Then, we determine the Poynting vector in the corresponding radiation zone. Finally, we determine the radiated power, emphasizing the symmetries of the problem and showing how we can approach its solution considering these symmetries. .
{"title":"Retarded potentials and radiation of a rotating charged rod","authors":"Aldrin Cervantes Contreras, Marco Ramirez Olvera, Lucio López Cavazos, Jose Alonso López Miranda, Adolfo Huet Soto","doi":"10.31349/revmexfise.20.010214","DOIUrl":"https://doi.org/10.31349/revmexfise.20.010214","url":null,"abstract":"In this paper we determine the electromagnetic properties of a rotating charged rod, which rotates around the x-axis with an angular frequency that it’s not constant. As the charge is changing its position over time, the electromagnetic information reaches us with a certain time lag. Therefore, it is necessary to obtain the time-dependent(retarded) potentials at any point in space, for which we need multipolar expansion to determine the field at any point in space and do a Taylor expansion of the distance at which we want to measure the electromagnetic fields, in the static and induction zone. Then, we determine the Poynting vector in the corresponding radiation zone. Finally, we determine the radiated power, emphasizing the symmetries of the problem and showing how we can approach its solution considering these symmetries. .","PeriodicalId":49600,"journal":{"name":"Revista Mexicana De Fisica E","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46697684","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 : 2023-01-13DOI: 10.31349/revmexfise.20.010204
G. F. Torres del Castillo
We show that the orthochronous proper Lorentz transformations that leave one of the Cartesian coordinates fixed can be represented by $2 times 2$ unitary matrices with determinant equal to 1, whose entries are double numbers. This representation is employed in the calculation of the Wigner angle, which arises in the composition of two boosts in arbitrary directions.
{"title":"Application of the double numbers in the representation of the Lorentz transformations","authors":"G. F. Torres del Castillo","doi":"10.31349/revmexfise.20.010204","DOIUrl":"https://doi.org/10.31349/revmexfise.20.010204","url":null,"abstract":"We show that the orthochronous proper Lorentz transformations that leave one of the Cartesian coordinates fixed can be represented by $2 times 2$ unitary matrices with determinant equal to 1, whose entries are double numbers. This representation is employed in the calculation of the Wigner angle, which arises in the composition of two boosts in arbitrary directions.","PeriodicalId":49600,"journal":{"name":"Revista Mexicana De Fisica E","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46558812","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 : 2023-01-13DOI: 10.31349/revmexfise.20.010201
Eduardo Tirado-Félix, R. Hernández-Pinto
The Standard Model contains three coupling constants α1, α2 and α3 associated to the intern symmetry groups. However, even such constants are named like that, in fact they are not, they are energy dependent functions. The functional form of the evolution satisfies a set of coupled differential equations the coupled β functions. In general these β functions are highly coupled, from this arises the necessity of using numerical methods for the solution of the problem, because it is not possible to obtain it analytically. In this work it is used the adaptive Runge-Kutta method for a set of ordinary differential equations. The physical motivation of this work arise from the fact that the coupling constants α1, α2 and α3 are associated to the electromagnetic interaction, the weak interaction and the strong interaction, respectively. In the Standard Model, the solutions for α1 and α2 intersect in a point, which can be interpreted as a unification of two fundamental interactions exists. Nevertheless, using the minimal supersymmetric extension of the Standard Model, the three coupling constants intersect in a region, reaching what is known as the Grand Unification.
{"title":"Solution of the coupled β functions of the Standard Model and its minimal supersymmetric extension","authors":"Eduardo Tirado-Félix, R. Hernández-Pinto","doi":"10.31349/revmexfise.20.010201","DOIUrl":"https://doi.org/10.31349/revmexfise.20.010201","url":null,"abstract":"The Standard Model contains three coupling constants α1, α2 and α3 associated to the intern symmetry groups. However, even such constants are named like that, in fact they are not, they are energy dependent functions. The functional form of the evolution satisfies a set of coupled differential equations the coupled β functions. In general these β functions are highly coupled, from this arises the necessity of using numerical methods for the solution of the problem, because it is not possible to obtain it analytically. In this work it is used the adaptive Runge-Kutta method for a set of ordinary differential equations. The physical motivation of this work arise from the fact that the coupling constants α1, α2 and α3 are associated to the electromagnetic interaction, the weak interaction and the strong interaction, respectively. In the Standard Model, the solutions for α1 and α2 intersect in a point, which can be interpreted as a unification of two fundamental interactions exists. Nevertheless, using the minimal supersymmetric extension of the Standard Model, the three coupling constants intersect in a region, reaching what is known as the Grand Unification.","PeriodicalId":49600,"journal":{"name":"Revista Mexicana De Fisica E","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46087886","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 : 2023-01-13DOI: 10.31349/revmexfise.20.010206
Antonio Muñoz, Omar Aguilar Loreto, Jorge L. Flores
En sistemas de medición de superficies mediante la técnica de corrimiento de fase con proyección de franjas, la calibración del sistema es una parte esencial para determinar la relación entre la fase obtenida y la altura real del objeto. En este trabajo, presentamos un análisis matemático detallado del modelo de calibración lineal. La deducción del esquema de mínimos cuadrados, requerido para la estimación, se plantea de forma intuitiva empleando la teoría subyacente en análisis numérico. El método de calibración es aplicado a la superficie de un objeto 3D obteniendo resultados favorables.
{"title":"Mínimos Cuadrados para la Calibración en Reconstrucción 3D mediante Proyección de Franjas","authors":"Antonio Muñoz, Omar Aguilar Loreto, Jorge L. Flores","doi":"10.31349/revmexfise.20.010206","DOIUrl":"https://doi.org/10.31349/revmexfise.20.010206","url":null,"abstract":"En sistemas de medición de superficies mediante la técnica de corrimiento de fase con proyección de franjas, la calibración del sistema es una parte esencial para determinar la relación entre la fase obtenida y la altura real del objeto. En este trabajo, presentamos un análisis matemático detallado del modelo de calibración lineal. La deducción del esquema de mínimos cuadrados, requerido para la estimación, se plantea de forma intuitiva empleando la teoría subyacente en análisis numérico. El método de calibración es aplicado a la superficie de un objeto 3D obteniendo resultados favorables.","PeriodicalId":49600,"journal":{"name":"Revista Mexicana De Fisica E","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46527684","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 : 2023-01-13DOI: 10.31349/revmexfise.20.010208
Atteeq Razzak, Zaheer Uddin
A Graphical User Interface (GUI) teaching tool to teach different vectors modules to college and undergraduate students have been developed. The Physics and Mathematics students can benefit from these executable spreadsheets for practicing vector algebra with minimum inputs and through diagrams and answers as output. The spreadsheets are employed to calculate vectors resolution, addition, projection, and multiplication because they are ubiquitous. Some GUI on vectors available online gives the results, whereas this GUI shows the calculation steps to reach the results, which helps learn the subject effectively. The developed GUI also assists the mentors regarding their lab work and exams to make different papers with answer keys.
{"title":"GUI of vector analysis on spreadsheets for students and teachers","authors":"Atteeq Razzak, Zaheer Uddin","doi":"10.31349/revmexfise.20.010208","DOIUrl":"https://doi.org/10.31349/revmexfise.20.010208","url":null,"abstract":"A Graphical User Interface (GUI) teaching tool to teach different vectors modules to college and undergraduate students have been developed. The Physics and Mathematics students can benefit from these executable spreadsheets for practicing vector algebra with minimum inputs and through diagrams and answers as output. The spreadsheets are employed to calculate vectors resolution, addition, projection, and multiplication because they are ubiquitous. Some GUI on vectors available online gives the results, whereas this GUI shows the calculation steps to reach the results, which helps learn the subject effectively. The developed GUI also assists the mentors regarding their lab work and exams to make different papers with answer keys.","PeriodicalId":49600,"journal":{"name":"Revista Mexicana De Fisica E","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46015756","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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