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Revista Mexicana de Física最新文献

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Resonant scattering by a loop: the Wigner delay time and Poisson’s kernel 环路共振散射：维格纳延迟时间和泊松内核
Revista Mexicana de Física Pub Date : 2024-01-03 DOI: 10.31349/revmexfis.70.011602
Javier Ruíz-Rubio, Moisés Martínez-Mares, Eleuterio Castaño
{"title":"Resonant scattering by a loop: the Wigner delay time and Poisson’s kernel","authors":"Javier Ruíz-Rubio, Moisés Martínez-Mares, Eleuterio Castaño","doi":"10.31349/revmexfis.70.011602","DOIUrl":"https://doi.org/10.31349/revmexfis.70.011602","url":null,"abstract":"\u0000 \u0000 \u0000The resonances of a loop pierced by a magnetic field are analized in terms of the scattering matrix phase, the Wigner delay time and its relation to Poisson’s kernel. Except for specific values of the magnetic flux, the resonances appear overlapped by pairs due to the broken degeneracy. Although it is well known that the Poisson kernel describes how the phase is distributed in the Argand plane, we demonstrate that Poisson’s kernel coincides with the reciprocal of the Wigner delay time, thus providing a novel interpretation of this quantity. The distribution of the Wigner delay time is also determined, it exhibits explicitly the effect of the magnetic flux, contrary to what happens to the distribution of the phase. \u0000 \u0000 \u0000","PeriodicalId":207412,"journal":{"name":"Revista Mexicana de Física","volume":"133 24","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139387696","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
Nonlinear effects and applications of AlN: A comprehensive physical formulation approach 氮化铝的非线性效应与应用：综合物理配方方法
Revista Mexicana de Física Pub Date : 2024-01-03 DOI: 10.31349/revmexfis.70.011004
A. F. Jaramillo Alvarado, A. Torres Jacome, Pedro Rosales, Gerardo Ulises Diaz Arango, Hector Vazquez Leal
{"title":"Nonlinear effects and applications of AlN: A comprehensive physical formulation approach","authors":"A. F. Jaramillo Alvarado, A. Torres Jacome, Pedro Rosales, Gerardo Ulises Diaz Arango, Hector Vazquez Leal","doi":"10.31349/revmexfis.70.011004","DOIUrl":"https://doi.org/10.31349/revmexfis.70.011004","url":null,"abstract":"Piezoelectric materials have nonlinear effects that can be used in 5G and IoT technologies. However, since most nonlinear problems in this area do not have analytic solutions, FEM simulations are an essential design tool. In this study, we have developed a stress-charge formulation for non-linear piezoelectric materials compatible with commonly used simulation tools in industry and research. FEM simulation results for AlN with three nonlinear phenomena are presented: variation of effective electrical permittivity, shift of the effective elasticity constants, and enhancement of electromechanical coupling factor. These simulations were conducted with the same material parameters, having great agreement with recent and important experimental results. The simulations allow us to deduce the values of the components of the high-order tensors for the first time as qr_331 = qr_333 = −1600 and g_333 = −80N/V m. The maximum percent errors obtained for the simulations of theeffective electrical permittivity and effective elasticity constants were 0.1% and 1.77%, respectively.","PeriodicalId":207412,"journal":{"name":"Revista Mexicana de Física","volume":"54 12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139388311","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
Vibration control of FGM plate using optimally placed piezoelectric patches 利用优化放置的压电贴片控制 FGM 板的振动
Revista Mexicana de Física Pub Date : 2024-01-03 DOI: 10.31349/revmexfis.70.011002
Zouaoui Satla, Lakhdar Boumia, Mohamed Kherrab
{"title":"Vibration control of FGM plate using optimally placed piezoelectric patches","authors":"Zouaoui Satla, Lakhdar Boumia, Mohamed Kherrab","doi":"10.31349/revmexfis.70.011002","DOIUrl":"https://doi.org/10.31349/revmexfis.70.011002","url":null,"abstract":"The aim of this study is to propose a methodology to actively control the vibration of functionally graded plates, with the help of piezoelectric actuators and sensors. The study relays on the classical plate theory to analytically formulate the governing equation of motion, which is then expanded to derive a space state equation of the model. The material properties of the FG plate are assumed to vary along the thickness direction. In order to improve the damping effectiveness, the location of the piezoelectric sensors and actuators is optimally determined using the H2 norm. The necessary control voltage was determined based on optimal LQR and LQG controllers.","PeriodicalId":207412,"journal":{"name":"Revista Mexicana de Física","volume":"30 12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139388570","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
Coherent superposition of states in degenerate systems using zero-area pulses 利用零面积脉冲实现退化系统中状态的相干叠加
Revista Mexicana de Física Pub Date : 2024-01-03 DOI: 10.31349/revmexfis.70.011303
Maghsoud Saadati-Niari, M. Amiri
{"title":"Coherent superposition of states in degenerate systems using zero-area pulses","authors":"Maghsoud Saadati-Niari, M. Amiri","doi":"10.31349/revmexfis.70.011303","DOIUrl":"https://doi.org/10.31349/revmexfis.70.011303","url":null,"abstract":"The coherent superposition of states in degenerate quantum systems is investigated using detuned laser pulses in which the Rabi frequencies are time-dependent, and the pulse area is zero. In this study, a quantum system with an arbitrary number of degenerate states in the ground set as well as an arbitrary number of degenerate states in the exciting set is considered. We assume that all states in the ground set are coupled to the excited states using laser pulses such that the pulse area of Rabi frequency is zero, and all of them have the same time dependence. It is also assumed that all laser pulses are in a non-resonant condition with Bohr transitions, and all detunings are the same. We will show that by applying the appropriate temporal dependence for the pulses and the appropriate rate for the detunings, the population can be transferred from an arbitrary superposition from the ground states to a desired superposition from the excited states.","PeriodicalId":207412,"journal":{"name":"Revista Mexicana de Física","volume":"20 19","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139388926","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
Modeling the impact of asteroids over Mexican territory 建立小行星撞击墨西哥领土的模型
Revista Mexicana de Física Pub Date : 2024-01-03 DOI: 10.31349/revmexfis.70.010701
Raul Gutierrez-Zalapa, Mario Rodríguez-Martínez, Ernesto Aguilar-Rodríguez, Joaquin Estevez-Delgado
{"title":"Modeling the impact of asteroids over Mexican territory","authors":"Raul Gutierrez-Zalapa, Mario Rodríguez-Martínez, Ernesto Aguilar-Rodríguez, Joaquin Estevez-Delgado","doi":"10.31349/revmexfis.70.010701","DOIUrl":"https://doi.org/10.31349/revmexfis.70.010701","url":null,"abstract":"This work focuses on knowing the physical, environmental and population effects from the impact of an asteroid occurring in the Mexican territory. The work consists of the adaptation of routines product of previous works in the literature to generate a numerical code written in PyThon that allowed modeling this kind of phenomenon. Firstly, a map of the superficial densities of the Mexican territory has been developed with a resolution of $0.5^circ$ of longitude by $0.5^circ$ of latitude of the Earth. The map allows us to find the value of surface density in a specific geological area of the country. Once the surface density value was obtained, it is established as the value of the impact site (target). The model requires using fixed parameters, such as the diameter of the body, its density or mass, the angle of incidence and the density value at the impact site. The output, provides the impact velocity, as well as the energy released, diameter and depth of the crater, the magnitude of the earthquake as well as the damage on the surface. We studied the Chicxulub asteroid event in two hypothetical scenarios. Firstly, the atmospheric density profile was modified, allowing the calculation of a new value for the impact velocity. Secondly, we assume that the object hits with a fraction of the initial mass, and with this the impact velocity and its effects were recalculated for three different targets. They were used to calculate the infrastructure damage they would cause if the impact could occur today. Finally, the results obtained by our model were compared with the literature, showing that they are consistent with the observational data. Models such as this one contribute to having tools for the attention towards the prevention of this kind of event that in the context of the study risks from the space are necessary in Mexico.","PeriodicalId":207412,"journal":{"name":"Revista Mexicana de Física","volume":"6 12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139389551","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
Design, construction and robust validation of a germicidal device based on UV irradiation: a necessity for hospital disinfection in the COVID-19 era 紫外线照射杀菌装置的设计、制造和可靠验证：COVID-19 时代医院消毒的必然选择
Revista Mexicana de Física Pub Date : 2024-01-03 DOI: 10.31349/revmexfis.70.010901
Ismael Martínez-Ramírez, C. Cruz-Cruz, Adolfo López Ornelas, E. M. Durán-Manuel, E. Estudillo, Iván Velasco, Miguel Angel Loyola-Cruz, Patricia Gutiérrez Zayas-Bazán, Jesús López López-Vargas, Yesenia Godínez-Cruz, Miguel Tufiño Velázquez, Gabriela Ibáñez Cervantes, Juan Manuel Bello López, Gerardo Silverio Contreras-Puente
{"title":"Design, construction and robust validation of a germicidal device based on UV irradiation: a necessity for hospital disinfection in the COVID-19 era","authors":"Ismael Martínez-Ramírez, C. Cruz-Cruz, Adolfo López Ornelas, E. M. Durán-Manuel, E. Estudillo, Iván Velasco, Miguel Angel Loyola-Cruz, Patricia Gutiérrez Zayas-Bazán, Jesús López López-Vargas, Yesenia Godínez-Cruz, Miguel Tufiño Velázquez, Gabriela Ibáñez Cervantes, Juan Manuel Bello López, Gerardo Silverio Contreras-Puente","doi":"10.31349/revmexfis.70.010901","DOIUrl":"https://doi.org/10.31349/revmexfis.70.010901","url":null,"abstract":"Pandemic by SARS-CoV-2 has revealed the importance of disinfection methods due to pathogens of medical importance being detectable and infective after several hours on contaminated surfaces, including medical devices. The aim of this work was to design, construction, and validation of a UVC light irradiation system in the short wavelength region (200 to 320 nm). We studied the effective of the system through in vitro disinfection to eliminate pathogens such as SARS-CoV-2, ESKAPE bacteria and fungi in biofilm and planktonic forms. Doses of 0.25 J/cm2 (10 s of exposure to UVC light), 100% death of ESKAPE bacteria and fungi in planktonic form was observed. Through biofilm formation induction assays of these microorganisms showed resistance to treatment with UV light; however, their viability was not detected after 20 s of exposure (via confocal microscopy). For SARS-CoV-2, 100% reduction was reached after 120 s of exposure. This evidence shows the need to employ emerging methods of disinfection of surfaces and medical devices since these are potential vehicles for transmitting pathogens. The advantages of using UV light as an emergent disinfection method in the era of COVID-19 are discussed.","PeriodicalId":207412,"journal":{"name":"Revista Mexicana de Física","volume":"96 21","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139387949","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
Solution of the fractional diffusion equation by using Caputo-Fabrizio derivative: application to intrinsic arsenic diffusion in germanium 利用卡普托-法布里齐奥导数求解分数扩散方程：应用于锗中砷的本征扩散
Revista Mexicana de Física Pub Date : 2024-01-03 DOI: 10.31349/revmexfis.70.010501
M. Meftah, A. A. Souigat, Z. Korichi
{"title":"Solution of the fractional diffusion equation by using Caputo-Fabrizio derivative: application to intrinsic arsenic diffusion in germanium","authors":"M. Meftah, A. A. Souigat, Z. Korichi","doi":"10.31349/revmexfis.70.010501","DOIUrl":"https://doi.org/10.31349/revmexfis.70.010501","url":null,"abstract":"In this work, we focused on solving the space-time fractional diffusion equation with an application on the intrinsic arsenic diffusion in germanium. At first we have treated the differential equation in a semi-infinite medium by using Caputo-Fabrizio fractional derivative. We have introduced the Laplace transform to solve this type of equations. Secondly, Based on the obtained solution, we have simulated an profile of arsenic diffusion in germanium under intrinsic conditions. Accurate simulations have been achieved showing that the fractional derivative orders affect on the estimation of the diffusion coefficient, where increasing the time fractional derivative order α reduces the value of the diffusion coefficient, while increasing the space fractional derivative order β increases the value of the diffusion coefficient.","PeriodicalId":207412,"journal":{"name":"Revista Mexicana de Física","volume":"140 43","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139387538","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
Systematic study of the structural, electronic and optical properties of silicon nanowires 系统研究硅纳米线的结构、电子和光学特性
Revista Mexicana de Física Pub Date : 2024-01-03 DOI: 10.31349/revmexfis.70.011003
A. Herrera-Carbajal, A. Sánchez-Castillo, José de Jesús Pelayo-Cárdenas, M. I. Reyes-Valderrama, Ventura Rodriguez-Lugo
{"title":"Systematic study of the structural, electronic and optical properties of silicon nanowires","authors":"A. Herrera-Carbajal, A. Sánchez-Castillo, José de Jesús Pelayo-Cárdenas, M. I. Reyes-Valderrama, Ventura Rodriguez-Lugo","doi":"10.31349/revmexfis.70.011003","DOIUrl":"https://doi.org/10.31349/revmexfis.70.011003","url":null,"abstract":"In this work we analyzed the structural, electronic, and optical properties of a set of silicon nanowires oriented in different directions, using the density functional theory. Structural optimization was performed in order to relax the atomic coordinates and cell parameters, after which the electronic band structure and density of states were obtained. Simultaneously, we computed the imaginary part of the dielectric function using the elements of the dipolar matrix. Furthermore, we related the transitions between the Van Hove singularities in the density of states with peaks in the absorption spectra, thus identifying relationships among them, which could be used to characterize the density of states by means of the absorption spectrum. The results showed that the electronic and optical properties depend on the diameter and orientation of the nanowires.","PeriodicalId":207412,"journal":{"name":"Revista Mexicana de Física","volume":"15 24","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139388852","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
Raman spectroscopy and electrical properties of polypyrrole doped dodecylbenzene sulfonic acid/Y2O3 composites 掺杂聚吡咯的十二烷基苯磺酸/Y2O3 复合材料的拉曼光谱和电学特性
Revista Mexicana de Física Pub Date : 2024-01-03 DOI: 10.31349/revmexfis.70.010502
Muhammad Irfan, A. Mustafa, A. Shakoor, A. N. Niaz, N. Anwar, M. Imran, A. Majid
{"title":"Raman spectroscopy and electrical properties of polypyrrole doped dodecylbenzene sulfonic acid/Y2O3 composites","authors":"Muhammad Irfan, A. Mustafa, A. Shakoor, A. N. Niaz, N. Anwar, M. Imran, A. Majid","doi":"10.31349/revmexfis.70.010502","DOIUrl":"https://doi.org/10.31349/revmexfis.70.010502","url":null,"abstract":"The doped dodecylbenzene sulfonic acid (DBSA) with polypyrrole (PPy) and also incorporated an increasing concentration of Y2O3 to obtain the composites of PPy-DBSA-Y2O3 via chemical polymerization technique. The PPy-DBSA-Y2O3 composites formation were confirmed by interaction between PPy-DBSA and Y2O3-particles utilizing Raman spectroscopy. Thermal stability of PPy-DBSA- Y2O3 composites was improved as enhanced the load of Y2O3-particles. The increase in DC conductivity by mixing Y2O3 into PPy-DBSA at all temperatures showed the three-dimensional Mott’s variable range hopping model. Density of localized states, hopping dimension as well as activation energy are computed and found to be affected due to the presence of Y2O3 in DBSA-PPy. The ESR of Y2O3 (~12 Ω), PPy (~11.80 Ω), PPy-DBSA (~11.30 Ω) and PPy-DBSA-8%Y2O3 composite (~9.50 Ω). EIS results confirm that the PPy-DBSA-8% Y2O3 composite with a low value of impedance gives a maximum value of electrical conductivity.","PeriodicalId":207412,"journal":{"name":"Revista Mexicana de Física","volume":"125 20","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139387716","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
Mass spectra, Regge trajectories and decay properties of heavy-flavour mesons 重味介子的质谱、雷格轨迹和衰变特性
Revista Mexicana de Física Pub Date : 2024-01-03 DOI: 10.31349/revmexfis.70.010801
Rahulbhai Mistry, Manan Shah, Ajay Majethiya
{"title":"Mass spectra, Regge trajectories and decay properties of heavy-flavour mesons","authors":"Rahulbhai Mistry, Manan Shah, Ajay Majethiya","doi":"10.31349/revmexfis.70.010801","DOIUrl":"https://doi.org/10.31349/revmexfis.70.010801","url":null,"abstract":"In this article, we study the mass spectra, Regge trajectories and decay properties of heavy-flavour mesons $Qbar{Q}$ $(Q=c,b)$ within a non-relativistic quark model. The spin hyperfine interaction is used to get the prediction for the heavy-meson masses for radial and orbital excitations. By using the radial and orbital excitations, we construct Regge trajectories for the heavy-mesons in the $(J,M^2)$ and $(n,M^2)$ plane and find their slopes and intercepts. We have computed leptonic, photonic and gluonic decay widths of heavy flavour mesons with and without QCD correction factor. We have compared our results of masses as well as decay widths with other theoretical and lattice QCD predictions for each states. Moreover, the known experimental results are also reasonably close to our predicted results.","PeriodicalId":207412,"journal":{"name":"Revista Mexicana de Física","volume":"34 21","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139389167","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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