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Phase function metod for elastic nucleon-nucleon scattering using Hellmann plus Coulomb potential 用赫尔曼加库仑势计算弹性核子-核子散射的相函数法
4区 物理与天体物理
Revista Mexicana De Fisica Pub Date : 2023-11-01 DOI: 10.31349/revmexfis.69.061201
Bidhan Khirali, B. Swain, A. K. Behera, U. Laha
{"title":"Phase function metod for elastic nucleon-nucleon scattering using Hellmann plus Coulomb potential","authors":"Bidhan Khirali, B. Swain, A. K. Behera, U. Laha","doi":"10.31349/revmexfis.69.061201","DOIUrl":"https://doi.org/10.31349/revmexfis.69.061201","url":null,"abstract":"The phase function method/variable phase approach to potential scattering is exploited to calculate the phase shifts for nucleon-nucleon systems in low and intermediate energy regions by representing nuclear part of the interaction by the Hellmann potential while the electromagnetic part by the Coulomb one. In addition, the differential and total scattering cross sections are estimated with our phase parameters. Results reproduced by the concerned potential are in good agreement with the previous works in the literature.","PeriodicalId":21538,"journal":{"name":"Revista Mexicana De Fisica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135373373","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Misapplication of the parametric statistics to calculate the uncertainties when calibrating commercial spectrocolorimeters 校正商用分光比色计时，参数统计在计算不确定度时的错误应用
4区 物理与天体物理
Revista Mexicana De Fisica Pub Date : 2023-11-01 DOI: 10.31349/revmexfis.69.061304
Sandra Eloísa Balderas-Mata, O. Ramos Soto, J. Medina Márquez
{"title":"Misapplication of the parametric statistics to calculate the uncertainties when calibrating commercial spectrocolorimeters","authors":"Sandra Eloísa Balderas-Mata, O. Ramos Soto, J. Medina Márquez","doi":"10.31349/revmexfis.69.061304","DOIUrl":"https://doi.org/10.31349/revmexfis.69.061304","url":null,"abstract":"Nowadays, when calibrating spectrocolorimeters, the uncertainties are calculated based on the premise that the obtained measurements have a Gaussian distribution, but there is no certainty that the latter is completely true. The aim of this work is to show that, when measuring reference materials with different spectrocolorimeters, most of the results do not have, for all the points in the visible spectrum of the spectral curve, a Gaussian distribution. Also, this distribution is not present in measurements of the chromatic coordinates of these materials. These measurements were performed with two integrating sphere spectrocolorimeters; a Minolta 2600d r (portable) and a Gretag Macbeth 7000 r (bench) equipment, under the same measurement parameters and conditions of repeatability, as well as controlled environmental conditions, i.e., 20 ± 1 ◦C. Since a Gaussian distribution is needed to use parametric statistics to calculate the combined uncertainties and consequently, the expanded ones, the statistical method currently used is erroneous. Thus, parametric statistics should not be used to calculate the spectrocolorimeters’ uncertainties.","PeriodicalId":21538,"journal":{"name":"Revista Mexicana De Fisica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135373389","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Landau levels for a Weyl pair in a monolayer medium and thermal quantities 单层介质中Weyl对的朗道能级和热量
4区 物理与天体物理
Revista Mexicana De Fisica Pub Date : 2023-11-01 DOI: 10.31349/revmexfis.69.061701
Abdullah Guvendi, Abdelmalek Boumali
{"title":"Landau levels for a Weyl pair in a monolayer medium and thermal quantities","authors":"Abdullah Guvendi, Abdelmalek Boumali","doi":"10.31349/revmexfis.69.061701","DOIUrl":"https://doi.org/10.31349/revmexfis.69.061701","url":null,"abstract":"In this paper, we consider a Weyl pair under the effect of an external uniform magnetic field in a monolayer medium without considering any charge-charge interaction between the particles. Choosing the interaction of the particles with the magnetic field in the symmetric gauge we seek for an analytical solution of the corresponding form of a one-time fully-covariant two-body Dirac equation derived from quantum electrodynamics via the action principle. As it is usual with two-body problems, we separate the relative motion and center of mass motion coordinates. Assuming the center of mass is at rest, we derive a matrix equation in terms of the relative motion coordinates without considering any group theoretical method. This equation gives a wave equation in exactly soluble form and accordingly we obtain the spinor components and complete energy eigen-states (in closed form) for such a spinless composite structure. Our results not only give exact Landau levels for such a Weyl pair in a monolayer medium but also show the considered system behaves as a two-dimensional harmonic oscillator. Furthermore, our findings give exactly the excited states of a Weyl particle under the effect of uniform external magnetic field in a monolayer graphene sheet and there is no imprint to distinguish these modes from each other. This means that the performed experiments based on Landau levels for a monolayer graphene sheet may actually involve many-body effects. Our results provide a suitable basis to analyze the associated thermal quantities and accordingly we discuss the thermal properties by determining free energy, total energy, entropy and specific heat for the composite system in question.","PeriodicalId":21538,"journal":{"name":"Revista Mexicana De Fisica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135373377","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Pressure dependence on Raman spectra of the molecular crystal 4-(benzenesulfonyl)-morpholine 4-(苯磺酰)-啉分子晶体拉曼光谱的压力依赖性
4区 物理与天体物理
Revista Mexicana De Fisica Pub Date : 2023-11-01 DOI: 10.31349/revmexfis.69.060502
Thiago Andrade De Toledo, Eduardo Delmondes Silva, Jorge Luiz Brito de Faria, Luiz Everson Da Silva, Paulo Sérgio Pizani
{"title":"Pressure dependence on Raman spectra of the molecular crystal 4-(benzenesulfonyl)-morpholine","authors":"Thiago Andrade De Toledo, Eduardo Delmondes Silva, Jorge Luiz Brito de Faria, Luiz Everson Da Silva, Paulo Sérgio Pizani","doi":"10.31349/revmexfis.69.060502","DOIUrl":"https://doi.org/10.31349/revmexfis.69.060502","url":null,"abstract":"The structural and vibrational properties of 4-(benzenesulfonyl)-morpholine, C10H13NO3S, have been studied using multinuclear (1H and 13C) NMR, IR and Raman spectroscopy techniques at pressures up to 3.2 GPa, as well as molecular modeling and vibrational mode assignment using DFT calculations with B3LYP functional and 6-31G (d,p) basis set and potential energy distribution (PED). Experimental and calculated spectra were compared and showed good accuracy. The sample was subjected to high pressure in the range of 0 to 3.2 GPa. The pressure measurements suggest a conformational transition for values around 0.7, 1.7 and 2.5 GPa, which was observed in some spectral regions, mainly in the high energy vibrational bands.","PeriodicalId":21538,"journal":{"name":"Revista Mexicana De Fisica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135371910","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Pseudoscalar current and covariance with the light-front approach 伪标量电流和与光前方法的协方差
4区 物理与天体物理
Revista Mexicana De Fisica Pub Date : 2023-11-01 DOI: 10.31349/revmexfis.69.060801
Jurandi Leão, Joao De Mello
{"title":"Pseudoscalar current and covariance with the light-front approach","authors":"Jurandi Leão, Joao De Mello","doi":"10.31349/revmexfis.69.060801","DOIUrl":"https://doi.org/10.31349/revmexfis.69.060801","url":null,"abstract":"Quantum Field Theory (QFT) is used to describe the physics of particles in terms of their fundamental constituents. The Light-Front Field Theory (LFFT), introduced by Paul Dirac in 1949 [1], is an alternative approach to solve some of the problems that arise in quantum field theory. The LFFT is similar to the Equal Time Quantum Field Theory (EQT), however, some particularities are not, such as the loss of covariance in the light-front. Pion electromagnetic form factor is studied in this work at lower and higher momentum transfer regions to explore the constituent quark models and the differences among these and other models. The electromagnetic current is calculated with both the “plus” and “minus” components in the light-front approach. The results are compared with other models, as well as with experimental data.","PeriodicalId":21538,"journal":{"name":"Revista Mexicana De Fisica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135371912","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effect of slide burnishing on corrosion potential in ASTM A-36 steel 滑动抛光对ASTM A-36钢腐蚀电位的影响
4区 物理与天体物理
Revista Mexicana De Fisica Pub Date : 2023-11-01 DOI: 10.31349/revmexfis.69.061002
A. Saldaña-Robles, M. Zapata-Torres, J. Moreno-Palmerin, Alfredo Márquez-Herrera
{"title":"Effect of slide burnishing on corrosion potential in ASTM A-36 steel","authors":"A. Saldaña-Robles, M. Zapata-Torres, J. Moreno-Palmerin, Alfredo Márquez-Herrera","doi":"10.31349/revmexfis.69.061002","DOIUrl":"https://doi.org/10.31349/revmexfis.69.061002","url":null,"abstract":"This study investigates the corrosion potential of ASTM A-36 steel after slide burnishing using different applied forces. Turned samples of ASTM A-36 steel were subjected to slide burnishing surface treatment. The burnishing process was carried out with forces of 150 N, 300 N, and 450 N, at a travel speed of 100 mm/min. The effects of burnishing on the chemical composition of the material were analyzed using Grazing Incidence X-ray Diffraction and X-ray photoelectron spectroscopy, which indicated no changes in the chemical composition of the material. Corrosion potential measurements were performed using the Tafel test. The results showed that as the burnishing force increased, the corrosion potential shifted to lower values. Additionally, roughness analysis suggested that the change in corrosion potential was attributed to plastic deformation caused by the burnishing process. The increased mechanical work exerted on the material during burnishing may be the underlying reason for the observed shift towards lower corrosion potentials with higher applied forces.","PeriodicalId":21538,"journal":{"name":"Revista Mexicana De Fisica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135371797","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Electromagnetic curves and Rytov’s law in the optical fiber with Maxwellian evolution via alternative moving frame 交替运动框架下光纤中的电磁曲线和雷托夫定律的麦克斯韦演化
4区 物理与天体物理
Revista Mexicana De Fisica Pub Date : 2023-11-01 DOI: 10.31349/revmexfis.69.061301
Semra Nurkan, Hazal Ceyhan, Zehra Özdemir, İsmail Gök
{"title":"Electromagnetic curves and Rytov’s law in the optical fiber with Maxwellian evolution via alternative moving frame","authors":"Semra Nurkan, Hazal Ceyhan, Zehra Özdemir, İsmail Gök","doi":"10.31349/revmexfis.69.061301","DOIUrl":"https://doi.org/10.31349/revmexfis.69.061301","url":null,"abstract":"In this study, we research the behavior of a linearly-polarized light wave in optical fiber and the rotation of the polarization plane through the alternative moving frame { N,C,W } in Minkowski 3-space. Then Berry’s phase equations are discussed for electromagnetic curves in the { C } and { W } directions along an optic fiber via alternative moving frame in Minkowski 3-space. Moreover, electromagnetic curve’s { C } and { W } Rytov parallel transportation laws are defined. Finally, we examine the electromagnetic curve’s Maxwellian evolution by Maxwell’s equation.","PeriodicalId":21538,"journal":{"name":"Revista Mexicana De Fisica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135372046","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Stable identification of sources located on the cerebral cortex from EEG over the scalp 通过头皮上的脑电图稳定地识别位于大脑皮层上的源
IF 1.7 4区 物理与天体物理
Revista Mexicana De Fisica Pub Date : 2023-09-01 DOI: 10.31349/revmexfis.69.050702
José Ángel Arias Cruz, M. M. Morín Castillo, J. O. Oliveros Oliveros, José Eligio Moisés Gutiérrez Arias
{"title":"Stable identification of sources located on the cerebral cortex from EEG over the scalp","authors":"José Ángel Arias Cruz, M. M. Morín Castillo, J. O. Oliveros Oliveros, José Eligio Moisés Gutiérrez Arias","doi":"10.31349/revmexfis.69.050702","DOIUrl":"https://doi.org/10.31349/revmexfis.69.050702","url":null,"abstract":"In this work, we present a stable algorithm for the inverse problem of identifying cortical sources from electroencephalographic measurements on the scalp. This inverse problem is ill-posed due to the numerical instability it presents, i.e., small changes in the measurements can produce large variations in the location of the sources. A boundary value problem is used to find correlations between the sources and measurements. In the case in which the head is modeled using two concentric spheres. We use spherical harmonics to find the solution to the inverse source cortical problem. To handle the numerical instability of this problem, we use the Tikhonov regularization method and a cut-off of the harmonic expansion series. From numerical tests, we found these parameters with which we get good approximations. Finally, we illustrate the algorithm proposed with synthetic examples","PeriodicalId":21538,"journal":{"name":"Revista Mexicana De Fisica","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42224285","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Raman and FTIR spectroscopy experimental and theoretical in magnetic nanoemulsion from Carapa Guianensis Aublet 桂树磁性纳米乳液的拉曼光谱和红外光谱实验与理论研究
IF 1.7 4区 物理与天体物理
Revista Mexicana De Fisica Pub Date : 2023-09-01 DOI: 10.31349/revmexfis.69.051003
L.G.F. Silva, Q.S. Martins, A. Ribas, D.L.L. Oliveira, R.C.S. Lima, J.G. Santos
{"title":"Raman and FTIR spectroscopy experimental and theoretical in magnetic nanoemulsion from Carapa Guianensis Aublet","authors":"L.G.F. Silva, Q.S. Martins, A. Ribas, D.L.L. Oliveira, R.C.S. Lima, J.G. Santos","doi":"10.31349/revmexfis.69.051003","DOIUrl":"https://doi.org/10.31349/revmexfis.69.051003","url":null,"abstract":"This work brings Raman and Fourier transform infrared (FTIR) spectroscopy as a proposal for a vibrational characterization of Carapa Guianensis Aublet essential oil in natura and polymerized and of magnetic nanoemulsion. Calculation of computational chemistry based on the method density functional theory with B3LYP functional and 6-311+G(d,p) base set parameters was used to obtain theoretical frequencies and vibrational signatures of the oleic acid molecule. Results of Raman and Fourier transform infrared spectroscopy confirm bands of Carapa Guianensis Aublet essential oil present in polymerized oil and magnetic nanoemulsion studied. The density functional theory method shows that the bands 1099 cm-1, 1714 cm-1 and 1812 cm-1 explain the presence of vibrational modes of oleic acid in the samples. The density functional theory brought good conformation to the chosen molecule.","PeriodicalId":21538,"journal":{"name":"Revista Mexicana De Fisica","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47153189","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Stability improvement of CH3NH3PbI3 hybrid perovskite through tin and chlorine doping 锡和氯掺杂提高CH3NH3PbI3杂化钙钛矿的稳定性
IF 1.7 4区 物理与天体物理
Revista Mexicana De Fisica Pub Date : 2023-09-01 DOI: 10.31349/revmexfis.69.051602
Bertha Oliva Aguilar Reyes, T. E. Soto, K. Sánchez, O. Navarro, A. Valdespino, D. Y. Torres Martínez
{"title":"Stability improvement of CH3NH3PbI3 hybrid perovskite through tin and chlorine doping","authors":"Bertha Oliva Aguilar Reyes, T. E. Soto, K. Sánchez, O. Navarro, A. Valdespino, D. Y. Torres Martínez","doi":"10.31349/revmexfis.69.051602","DOIUrl":"https://doi.org/10.31349/revmexfis.69.051602","url":null,"abstract":"In recent years, the hybrid perovskite CH3NH3PbI3 has been widely studied because of its potential application in the fabrication of high efficiency solar cells. The main challenge is to avoid destabilization of this compound under working conditions. Indeed, the MAPbI3 begins to decompose into the precursor phases, a few hours or days after being formed. We reported a stability monitoring of doped compounds CH3NH3Pb0.9Sn0.1I2.8Cl0.2 and CH3NH3Pb0.75Sn0.25I2.5Cl0.5 obtained as films from solutions of the precursors in N-N dimethylformamide on chemically treated glass substrates. The monitoring was carried out using X-Ray diffraction and absorbance measurements in the UV-Vis region. The tetragonal symmetry initially determined for the three compounds, remains almost unaltered for CH3NH3Pb0.75Sn0.25I2.5Cl0.5 even after 600 days, under environmental conditions. The bandgap value for this doped perovskite is 1.44 eV.","PeriodicalId":21538,"journal":{"name":"Revista Mexicana De Fisica","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44617000","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","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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