Revista Mexicana de Física最新文献_第5页

First-principles study of structural, electronic and magnetic properties of diluted magnetic semiconductor and superlattices based‏ on Cr-doped ZnS and ZnSe compounds in wurtzite-type crystal 基于掺杂铬的 ZnS 和 ZnSe 复合物的稀磁半导体和超晶格在钨锆石型晶体中的结构、电子和磁性能的第一性原理研究

Revista Mexicana de Física Pub Date : 2024-03-01 DOI: 10.31349/revmexfis.70.020501

Miloud Hadj Zoubir, O. Cheref, M. Merabet, S. Benalia, Lakhdar Djoudi, Djamel Rached, M. Boucharef

{"title":"First-principles study of structural, electronic and magnetic properties of diluted magnetic semiconductor and superlattices based‏ on Cr-doped ZnS and ZnSe compounds in wurtzite-type crystal","authors":"Miloud Hadj Zoubir, O. Cheref, M. Merabet, S. Benalia, Lakhdar Djoudi, Djamel Rached, M. Boucharef","doi":"10.31349/revmexfis.70.020501","DOIUrl":"https://doi.org/10.31349/revmexfis.70.020501","url":null,"abstract":"We performed first-principle calculations to investigate the structural, electronic, and magnetic properties of ZnS and ZnSe binary compounds, Zn0.5Cr0.5S and Zn0.5Cr0.5Se DMS alloys and (ZnS)2/Zn0.5Cr0.5Se and (ZnSe)2/Zn0.5Cr0.5S superlattices in the wurtzite structure using the full potential linear muffin–tin orbital (FP-LMTO) method. Features such as lattice constant, modulus of compressibility and its first derivative, spin-polarized band structures, total and local or partial electronic densities of states and magnetic properties were calculated. The electronic structure shows that Zn0.5Cr0.5S and Zn0.5Cr0.5Se DMS alloys and (ZnS)2/Zn0.5Cr0.5Se and (ZnSe)2/Zn0.5Cr0.5S superlattices are half-metallic ferromagnetic with 100% complete spin polarization. The total magnetic moments calculated show the same integer value of 4 µB, which confirms the ferromagnetic half-metallic behavior of these compounds. We found that the ferromagnetic state is stabilized by the p-d exchange associated with the double-exchange mechanism. Zn0.5Cr0.5S and Zn0.5Cr0.5Se DMS alloys and (ZnS)2/Zn0.5Cr0.5Se and (ZnSe)2/Zn0.5Cr0.5S superlattices are shown to be promising new candidates for applications in the fields of spintronics.","PeriodicalId":207412,"journal":{"name":"Revista Mexicana de Física","volume":"22 10","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140082834","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

Structural and dielectric characterization of Potassium diphosphate/Hydroxyapatite ceramic biocomposite 二磷酸钾/羟基磷灰石陶瓷生物复合材料的结构和介电特性分析

Revista Mexicana de Física Pub Date : 2024-03-01 DOI: 10.31349/revmexfis.70.021001

Maritza Iveth Pérez Valverde, Osmany García Zaldívar, María Eugenia Mendoza Álvarez

引用次数: 0

Interferometer study of radial and axial density evolution and temperature in N2 gas subjected to negative and positive corona discharges 对受到负电晕和正电晕放电的 N2 气体中径向和轴向密度演变及温度的干涉仪研究

Revista Mexicana de Física Pub Date : 2024-03-01 DOI: 10.31349/revmexfis.70.021302

M. Lemerini, A. K. Ferouani, M. Sahlaoui, L.P.T Laboratory

引用次数: 0

Effect of self-lubricating carbon materials on the tribological performance of ultra-high molecular weight polyethylene 自润滑碳材料对超高分子量聚乙烯摩擦学性能的影响

Revista Mexicana de Física Pub Date : 2024-03-01 DOI: 10.31349/revmexfis.70.021002

N. Camacho, J. M. Gonzalez Carmona, D. G. Espinosa-Arbelaez, R. Hernández-Bravo, J. Muñoz Saldaña, V. Mujica, Guillermo César Mondragón Rodríguez

{"title":"Effect of self-lubricating carbon materials on the tribological performance of ultra-high molecular weight polyethylene","authors":"N. Camacho, J. M. Gonzalez Carmona, D. G. Espinosa-Arbelaez, R. Hernández-Bravo, J. Muñoz Saldaña, V. Mujica, Guillermo César Mondragón Rodríguez","doi":"10.31349/revmexfis.70.021002","DOIUrl":"https://doi.org/10.31349/revmexfis.70.021002","url":null,"abstract":"For over five decades, ultra-high molecular weight polyethylene (UHMWPE) has been the standard material for total knee replacements (TKR). Zero wear of the UHMWPE would be ideal; however, due to the natural knee movements, wear damage to the UHMWPE articulating surface is inevitable. The generated wear debris results in joint mechanical instability, reduced joint mobility, increased pain, and implant loosening. Because of these issues, the research on the materials in TKRs has increased their survival rate for up to 20 years; however, in younger patients, the durability of the UHMWPE component decreases due to increased physical activity. Hence there is a constant need for highly wear-resistant tribological pairs for TKRs. Carbon-based materials have an excellent balance between lubricating and mechanical properties and have shown great promise in tribological applications. This study used self-lubricating cubic titanium carbide (c-TiC) and multiwalled carbon nanotubes (MWCNTs) to improve the UHMWPE wear resistance further. The combination of carbon-based materials decreased the material loss by about 41.7 % compared to the UHMWPE vs. bare steel ball tribological pair. The improvement, attributed to the c-TiC self-lubricating coating surface, is close to 5 %. Cold flow and burnishing were the predominant wear mechanisms observed in all the systems; more subtle wear processes were detected for the sliding couple with c-TiC self-lubricating coating. Meanwhile, polymer delamination and micrometer-sized debris formation were the main wear mechanisms in the UHMWPE-MWCNT vs. bare steel ball system. The adhesion work obtained from the electronic structure calculations shows a more significant interfacial interaction of the CNTs on the c-TiC surface. This interaction can be associated with the layer formation that protects the surface from wear and friction.","PeriodicalId":207412,"journal":{"name":"Revista Mexicana de Física","volume":"108 37","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140090085","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 inverse problem of estimating particle size distributions 解决粒度分布估算的逆问题

Revista Mexicana de Física Pub Date : 2024-03-01 DOI: 10.31349/revmexfis.70.021304

Milton Alejandro Escobar Vázquez, Silvia Reyes Mora, A. S. Cruz Félix

{"title":"Solution of the inverse problem of estimating particle size distributions","authors":"Milton Alejandro Escobar Vázquez, Silvia Reyes Mora, A. S. Cruz Félix","doi":"10.31349/revmexfis.70.021304","DOIUrl":"https://doi.org/10.31349/revmexfis.70.021304","url":null,"abstract":"In this work, we describe two alternative methods for solving the ill-conditioned inverse problem that allows estimating the particle size distribution (PSD) from turbidimetry measurements. The first method uses the inverse Penrose matrix to solve the inverse problem in its discrete form. The second method consists of replacing an ill-posed problem with a collection of well-posed problems, penalizing the norm of the solution, and it is known as the Tikhonov regularization. Both methods are used to solve a synthetic application of the inverse problem by solving the direct problem using a theoretical expression of the distribution of particles sizes function f(D) and considering soft industrial latex particles (NBR), with average particle diameters of: 80.4, 82.8, 83.6, and 84.5 nm; and three illumination wavelengths in the UV-Vis region: 300, 450, and 600 nm. The estimated solution obtained by the inverse Penrose matrix is different from the original solution due to the inverse problem is ill-conditioned. In contrast, when using Tikhonov’s regularization, the estimate obtained is close to the original solution, which proves that the particle size distribution is adequate.","PeriodicalId":207412,"journal":{"name":"Revista Mexicana de Física","volume":"115 35","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140090414","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

Spectroscopic analysis of residual radicals of gamma sterilized UHMWPE with fractional order differential operators 利用分数阶微分算子对伽马射线灭菌超高分子量聚乙烯的残余自由基进行光谱分析

Revista Mexicana de Física Pub Date : 2024-01-03 DOI: 10.31349/revmexfis.70.011001

Muhammad Mudassir Saeed, Malik Sajjad Mehmood, Muddassar Muhammad

{"title":"Spectroscopic analysis of residual radicals of gamma sterilized UHMWPE with fractional order differential operators","authors":"Muhammad Mudassir Saeed, Malik Sajjad Mehmood, Muddassar Muhammad","doi":"10.31349/revmexfis.70.011001","DOIUrl":"https://doi.org/10.31349/revmexfis.70.011001","url":null,"abstract":"The purpose of this research was to evaluate the Grunwald-Letnikov definition of fractional order derivatives for determining the fractional derivative of ESR signals from UHMWPE free radicals using the fitted Gaussian distribution method. Specifically, the study focused on analyzing two long-lasting oxygen-induced residual radicals di- or tri-enyls with a carbon center radical (R1) and the oxygen-containing radical (R2). The impact of the derivative order on ESR spectral parameters, such as the Landé g-factor and peak-to-peak separation, was analyzed, and new spectral parameters were established for both radicals. The samples were measured in an ESR tube using ESR power saturation techniques at room temperature. Following the measurements, the fitted Gaussian distribution of the ESR signals was used to determine the fractional derivative using the Grunwald-Letnikov definition. Two estimators (I and II) were developed for both radicals, and their values were found to be 9.19 and 4.27 for Radical R1 and 11.51 and 2060.62 for Radical R2. Our results showed that the fractional derivative approach provided accurate and reliable estimations for the radicals. This method can be easily implemented for various ESR signals and can be useful in many applications, including materials science and biomedical research. The accuracy and reliability of our estimators were confirmed by comparing them with the results obtained from the conventional method. Our findings have important implications for materials science and biomedical research, where ESR signals are widely used. This method can help researchers to obtain more accurate and reliable estimations of radicals, which can ultimately lead to more accurate and reliable conclusions in their studies. Additional research is required to assess the effectiveness of this approach on various ESR signals and to investigate its potential use in other fields of study.","PeriodicalId":207412,"journal":{"name":"Revista Mexicana de Física","volume":"101 7","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139388066","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

Discriminando superposiciones de estados coherentes mediante formas de línea 利用线形判别相干态重叠

Revista Mexicana de Física Pub Date : 2024-01-03 DOI: 10.31349/revmexfis.70.011302

Leonardi Hernández Sánchez, Irán Ramos Prieto, Francisco Soto Eguibar, Héctor Manuel Moya Cessa

{"title":"Discriminando superposiciones de estados coherentes mediante formas de línea","authors":"Leonardi Hernández Sánchez, Irán Ramos Prieto, Francisco Soto Eguibar, Héctor Manuel Moya Cessa","doi":"10.31349/revmexfis.70.011302","DOIUrl":"https://doi.org/10.31349/revmexfis.70.011302","url":null,"abstract":"Este artículo investiga el efecto de niveles cercanos no resonantes en las líneas espectrales de los átomos que interactúan con un campo electromagnético. Específicamente, examinamos el efecto AC Stark que ocurre cuando la frecuencia del campo coincide con la frecuencia de transición entre dos niveles más bajos y el campo tiene un número promedio pequeño de fotones (|α| 2 < 4). Nuestra investigación demuestra que los cambios en la forma de la línea espectral se pueden utilizar para distinguir entre los estados de gato de Schrödinger con fases opuestas en π, a saber, los estados |αi + |−αi y |αi − |−αi. Descriptores: Estados gato de Schrödinger; efecto AC stark; formas de las líneas; espectrales, modelo de Jaynes-Cummings.\u0000 \u0000This article investigates the effect of near non-resonant levels on the spectral lines of atoms interacting with an electromagnetic field. Specifically, we examine the AC Stark effect that occurs when the field frequency matches the transition frequency between two lower levels and the field has a small average number of photons (|α| 2 < 4). Our research demonstrates that the changes in spectral line shape can be used to distinguish between Schrödinger cat states with opposite phases in π, namely, the states |αi + |−αi and |αi − |−αi.","PeriodicalId":207412,"journal":{"name":"Revista Mexicana de Física","volume":"47 10","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139388397","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

Investigation on the electrocatalytic oxidation of alcohol using zinc oxide thin films deposited by pulsed electrodeposition on an indium tin oxide surface 利用脉冲电沉积法在氧化铟锡表面沉积氧化锌薄膜对酒精进行电催化氧化的研究

Revista Mexicana de Física Pub Date : 2024-01-03 DOI: 10.31349/revmexfis.70.011005

Meriem Lakhdari, Khadidja Hadj Larbi, Abdelkader Nebatti Ech-chergui, F. Habelhames, N. Benaioun, Jean Michel Nunzi, Sanat Kumar Mukherjee, Mehdi Adjdir

{"title":"Investigation on the electrocatalytic oxidation of alcohol using zinc oxide thin films deposited by pulsed electrodeposition on an indium tin oxide surface","authors":"Meriem Lakhdari, Khadidja Hadj Larbi, Abdelkader Nebatti Ech-chergui, F. Habelhames, N. Benaioun, Jean Michel Nunzi, Sanat Kumar Mukherjee, Mehdi Adjdir","doi":"10.31349/revmexfis.70.011005","DOIUrl":"https://doi.org/10.31349/revmexfis.70.011005","url":null,"abstract":"To perform electro-catalytic oxidation of alcohols in an alkaline media, zinc oxide (ZnO) thin films were effectively deposited on indium tin oxide (ITO) substrates using the pulsed electrodeposition (PE) method in a zinc nitrate aqueous solution. Analyses of microstructural, photoelectrochemical, and optical characteristics of ZnO thin films were performed as a function of pulsed electrodeposition parameters. XRD analysis was applied to determine structural properties, and SEM and AFM analysis were used to investigate morphological characteristics. X-ray diffraction analyses revealed that the produced films were polycrystalline and had a (002) preferentially oriented, hexagonal wurtzite structure. The morphology of ZnO has improved in the direction of nanorod films, as evidenced by scanning electron microscopy (SEM) and atomic force microscopy (AFM) images. UV transmittance data was used using Tauc's relationship to determine the film's bandgap to be 3.26 eV. The photocurrent response shows that ZnO films have high values, at 305.17 A/cm2, and good optical characteristics. The electrocatalytic oxidation of methanol was finally evaluated on the films. After being optimized in the pulsed electrodeposition mode, ZnO thin film characteristics and methanol electrocatalytic oxidation both saw substantial improvements. \u0000 ","PeriodicalId":207412,"journal":{"name":"Revista Mexicana de Física","volume":"26 21","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139388812","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

Artificial intelligence and Fourier optics: Application of DeepLabV3+ in the recovery of a diffracting aperture in light propagation 人工智能与傅立叶光学：应用 DeepLabV3+ 恢复光传播中的衍射孔径

Revista Mexicana de Física Pub Date : 2024-01-03 DOI: 10.31349/revmexfis.70.011301

C. Camacho-Bello, L. Gutiérrez-Lazcano, R. Ortega-Mendoza

引用次数: 0

Photothermal properties of Fe3O4 nanoparticles coated with turmeric extract 涂有姜黄提取物的 Fe3O4 纳米粒子的光热特性

Revista Mexicana de Física Pub Date : 2024-01-03 DOI: 10.31349/revmexfis.70.011601

Margarita Alvarado, A. E. Matías Reyes, A. Cruz-Orea, J. Santoyo-Salazar, F. A. Domínguez-Pacheco, C. Hernández-Aguilar, A. A. Duran-Ledezma

引用次数: 0