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Revista Mexicana De Fisica E最新文献

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The entropy of systems 系统的熵
Revista Mexicana De Fisica E Pub Date : 2023-01-13 DOI: 10.31349/revmexfise.20.010211
J. L. Manríquez-Zepeda, J. Rueda-Paz, P. Filio-Aguilar, L. López-García
{"title":"The entropy of systems","authors":"J. L. Manríquez-Zepeda, J. Rueda-Paz, P. Filio-Aguilar, L. López-García","doi":"10.31349/revmexfise.20.010211","DOIUrl":"https://doi.org/10.31349/revmexfise.20.010211","url":null,"abstract":"The entropy concept is studied from the perspective of several formalisms. It is reviewed the origins of this in the classical thermodynamics. It also is developed a step-by-step-clearly demonstration about it. After that, it is connected this formula with the entropy of Shannon. Elementary concepts of the quantum mechanics are explained to demonstrate the von Neumann entropy formula. It is proposed the entropy concept as a measure of the variability into the distribution of the states of a system given a set of rules that operate inside it for a while. From the perspective of the information theory, a language reaches a configuration to be optimal for communications. In this way, systems and languages can be studied using the same concept of entropy. It is stressed the importance of the teaching of the entropy because this is useful in the development of new technologies, for example the quantum communications.","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":"43064918","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}
引用次数: 0
A new rolling friction coefficient measurement method based on the work-energy theorem 基于功能定理的滚动摩擦系数测量新方法
Revista Mexicana De Fisica E Pub Date : 2023-01-13 DOI: 10.31349/revmexfise.20.010210
M. Kovačević, M. Milošević, Lj. Kuzmanović
{"title":"A new rolling friction coefficient measurement method based on the work-energy theorem","authors":"M. Kovačević, M. Milošević, Lj. Kuzmanović","doi":"10.31349/revmexfise.20.010210","DOIUrl":"https://doi.org/10.31349/revmexfise.20.010210","url":null,"abstract":"The rolling friction coefficient represents a characteristic parameter for the rolling motion. To determine the rolling friction coefficient, we propose a simple method based on the conservation of energy. The measuring setup includes the tools and materials that are simple and easy to obtain, such as the spring, ruler, and a small laboratory wheeled cart. In this paper, we have determined the rolling friction coefficient for several masses of the test carts and different lengths of spring compression. When the spring is compressed, its energy is directly proportional to the square of the length of the spring compression. The initial speed of the cart was determined using the law of energy conservation, and the length that the cart goes before stopping is measured with a ruler. The conclusion is that the value of the rolling friction coefficient is usually very small and that the mass of an object will affect the friction force but will not affect the rolling friction coefficient. Besides determining the rolling friction coefficient, this technique should help students comprehend the concept of friction easily.","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":"42816485","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}
引用次数: 0
A Python program to draw energy level diagram and to calculate quantum defects, the high lying Rydberg level 一个Python程序，用于绘制能级图和计算量子缺陷，即高里德堡能级
Revista Mexicana De Fisica E Pub Date : 2023-01-13 DOI: 10.31349/revmexfise.20.010203
Hasan Nafees, Saba Javaid, Misha shafi,, Ahmed Ali Rajput, M. Daniyal, M. M. Zahid, Fatima Ejaz
{"title":"A Python program to draw energy level diagram and to calculate quantum defects, the high lying Rydberg level","authors":"Hasan Nafees, Saba Javaid, Misha shafi,, Ahmed Ali Rajput, M. Daniyal, M. M. Zahid, Fatima Ejaz","doi":"10.31349/revmexfise.20.010203","DOIUrl":"https://doi.org/10.31349/revmexfise.20.010203","url":null,"abstract":"Rydberg atoms have strong and adjustable atomic interactions that can be tweaked by choosing different states with various principal quantum numbers or orbital angular momentum. They are highly used in quantum information applications. Furthermore, these atoms have long lifetimes and many possible energy levels, and their separations enable coupling to electromagnetic fields with frequencies ranging over six orders of magnitude. We studied some properties of these atoms and have developed a python program; the program gives two options. Firstly, it calculates energies of elements in s, p, d, and f orbitals and draws an energy level diagram of the element listed in the program. Secondly, it gives an option for calculating energy and quantum defects of atoms and ions, either listed or not listed in the program and generates their graphs accordingly. There are 21 elements in the database  whose energy level diagrams could be drawn. The database can be extended by adding more elements. \u0000 ","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":"46063964","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}
引用次数: 0
Lambda-shiftings for the secondary sources in the Young's experiment allow to rebuild patterns look like piston/tilt 在杨的实验中，次级源的λ位移允许重建看起来像活塞/倾斜的模式
Revista Mexicana De Fisica E Pub Date : 2023-01-13 DOI: 10.31349/revmexfise.20.010207
J. Salinas-Luna, J. Mentado Morales, J. M. Nuñez-Alfonso
{"title":"Lambda-shiftings for the secondary sources in the Young's experiment allow to rebuild patterns look like piston/tilt","authors":"J. Salinas-Luna, J. Mentado Morales, J. M. Nuñez-Alfonso","doi":"10.31349/revmexfise.20.010207","DOIUrl":"https://doi.org/10.31349/revmexfise.20.010207","url":null,"abstract":"In this work, we perform the mathematical theory used by Born and Wolf to rebuild a geometric characterization for piston and tilt or a combination of both surface errors by shifting the secondary sources in the classical Young's experiment. The last is accomplished making a comparison between the generated patterns of classical Young' experiment and Young's patterns when the secondary sources are shifted axially of the order of $lambda$. Images with effects looks like to surface errors by piston or tilt are obtained and this give us a good idea on how could be the co-phasing of an optical flat surface in a real experiment.","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":"42250707","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}
引用次数: 0
Estudio de la actividad ´optica de sustancias org´anicas
Revista Mexicana De Fisica E Pub Date : 2023-01-13 DOI: 10.31349/revmexfis.20.010209
Eduardo Hernández Hernández, Erick Barrios Barocio
{"title":"Estudio de la actividad ´optica de sustancias org´anicas","authors":"Eduardo Hernández Hernández, Erick Barrios Barocio","doi":"10.31349/revmexfis.20.010209","DOIUrl":"https://doi.org/10.31349/revmexfis.20.010209","url":null,"abstract":"El poder rotatorio que presentan ciertas sustancias orgánicas es un fenómeno consecuencia de la actividad óptica, es decir, de la interacción del campo electromagnético con la estructura de ciertas moléculas. En consecuencia, es un tema de interés tanto en física como en química, situación que es relevante en la formación académica de estudiantes, ampliando su visión fuera del ámbito académico de la física. En este trabajo se detalla como realizar una actividad experimental que permite abordar de forma cuantitativa este tema mediante el cálculo del poder rotatorio de compuestos químicos básicos y fáciles de conseguir o producir en un laboratorio de enseñanza. Los resultados encontrados para la rotación óptica de las sustancias estudiadas tienen un error promedio del 10% respecto de los valores reportados; sin embargo, también es posible deducir cuando una sustancia no es pura, ya que el error respecto de valores reportados se incrementa.","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":"42331727","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}
引用次数: 0
The one-dimensional Coulomb oscillator 一维库仑振子
Revista Mexicana De Fisica E Pub Date : 2023-01-13 DOI: 10.31349/revmexfise.20.010213
V. Ivchenko
{"title":"The one-dimensional Coulomb oscillator","authors":"V. Ivchenko","doi":"10.31349/revmexfise.20.010213","DOIUrl":"https://doi.org/10.31349/revmexfise.20.010213","url":null,"abstract":"We consider the one-dimensional oscillations of a charged point particle under the restoring Coulomb force. We find that, for very small amplitudes, the speed of the particle remains almost constant. We also obtain the exact analytical expression for finding the oscillation period. It turns out to be a monotonically increasing function of the amplitude. For small amplitudes, this quantity is directly proportional to the amplitude itself.","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":"44155195","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}
引用次数: 0
Determinación de las concentraciones al equilibrio en una reacción química 化学反应中平衡浓度的测定
Revista Mexicana De Fisica E Pub Date : 2023-01-13 DOI: 10.31349/revmexfise.20.010212
Humberto Laguna Galindo, Saúl J. C. Salazar, Robin P. Sagar
{"title":"Determinación de las concentraciones al equilibrio en una reacción química","authors":"Humberto Laguna Galindo, Saúl J. C. Salazar, Robin P. Sagar","doi":"10.31349/revmexfise.20.010212","DOIUrl":"https://doi.org/10.31349/revmexfise.20.010212","url":null,"abstract":"En este trabajo se discute el problema de calcular las concentraciones en el equilibrio químico cuando aparecen ecuaciones polinomiales de grado mayor que dos, lo cual depende de los valores de los coeficientes estequiométricos, así como del número de reactivos y productos de la reacción química en cuestión. A pesar de ser un caso frecuente, el problema no se trata en los libros de texto de química o fisicoquímica básica debido a que es necesario resolver las ecuaciones numéricamente. Se proporcionan programas para los métodos de bisección, Newton-Raphson y secante, que pueden ser utilizados de forma sencilla en reacciones de hasta siete reactivos y siete productos. Con el propósito de evitar el uso de los códigos como cajas negras, se explican con detalle los tres métodos iterativos, de tal manera que para estudiantes de matemáticas, este problema es una aplicación tomada de la fisicoqu'imica, y para estudiantes de física, química e ingeniería, es una aproximación didáctica a los métodos matemáticos para el tratamiento de ecuaciones. Este ejemplo puede ser utilizado en cursos de métodos numéricos. Finalmente, se ilustra y compara el desempeño de los tres métodos utilizando como ejemplo el proceso de Haber$-$Bosch. Es importante mencionar que para utilizar los códigos, no hay necesidad de hacer ninguna instalación en la computadora.","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":"44017644","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}
引用次数: 0
Socio-scientific issues in physics learning to improve students’ critical thinking skills 物理学习中的社会科学问题，提高学生的批判性思维能力
Revista Mexicana De Fisica E Pub Date : 2023-01-13 DOI: 10.31349/revmexfise.20.010202
Febriani, J. Jumadi, W. S. B. Dwandaru
{"title":"Socio-scientific issues in physics learning to improve students’ critical thinking skills","authors":"Febriani, J. Jumadi, W. S. B. Dwandaru","doi":"10.31349/revmexfise.20.010202","DOIUrl":"https://doi.org/10.31349/revmexfise.20.010202","url":null,"abstract":"Socio Scientific Issues (SSI) is a social issue that causes controversy and can be studied based on scientific facts. Applying SSI to physics subjects helps students relate physics to real things in everyday life. The purpose of this study was to determine the teacher's view of the success of students' critical thinking processes that can be obtained from studying physics through SSI. The research method used is a qualitative method with a phenomenological approach. This study involved 4 resource persons consisting of 2 senior and 2 junior physics teachers. The results of this study indicate that SSI in physics learning can help students practice critical thinking skills. This is based on the various processes experienced by students during the physics learning process with SSI.","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":"41466350","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}
引用次数: 1
Local time in Lagrangian mechanics 拉格朗日力学中的当地时间
Revista Mexicana De Fisica E Pub Date : 2022-07-01 DOI: 10.31349/revmexfise.19.020209
G. F. Torres del Castillo
{"title":"Local time in Lagrangian mechanics","authors":"G. F. Torres del Castillo","doi":"10.31349/revmexfise.19.020209","DOIUrl":"https://doi.org/10.31349/revmexfise.19.020209","url":null,"abstract":"We show that under the replacement of the time by a local time in the Lagrange equations, the form of the equations is maintained if the Lagrangian does not depend explicitly on the time. We also study the corresponding modifications in the Hamilton equations and in the Hamilton--Jacobi equation.","PeriodicalId":49600,"journal":{"name":"Revista Mexicana De Fisica E","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43356511","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}
引用次数: 0
Hafele and Keating in a fictious gravitational field 海菲尔和基廷在一个虚构的引力场中
Revista Mexicana De Fisica E Pub Date : 2022-06-24 DOI: 10.31349/revmexfise.19.020208
E. Benedetto, G. Iovane
{"title":"Hafele and Keating in a fictious gravitational field","authors":"E. Benedetto, G. Iovane","doi":"10.31349/revmexfise.19.020208","DOIUrl":"https://doi.org/10.31349/revmexfise.19.020208","url":null,"abstract":"The so called twin paradox is described in every special relativity (SR) textbook. Obviously, an exact calculation requires the application of the general theory of relativity (GR) but, thanks to some simplifying hypotheses concerning the acceleration and deceleration phases, even in SR it is possible to find the correct solution and that is \"the twin who goes on space travel is the one who, returning to Earth, finds the aged brother.\" In a curved spacetime, instead, we have the algebraic sum between a kinematic and a gravitational effect. What happens in the presence of a gravitational field is, for example, well described by Hafele and Keating's experiment and, in this case, it may happen that the traveling brother can grow older than his brother at rest. Continuing in this pedagogical tradition, we consider the Hafele and Keating experiment in a fictious gravitational field of a rotating frame. The equality of the results between curved spacetime of a real gravitational field and flat spacetime of a fictitious one, in our opinion, is interesting to emphasize even today the great genius of Einstein and that is \"inertia is gravity in disguise\".","PeriodicalId":49600,"journal":{"name":"Revista Mexicana De Fisica E","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44552050","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}
引用次数: 0
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