Revista Mexicana de Física最新文献_第2页

Advancements in biofuel research: Understanding the physical and chemical characteristics of green diesel 生物燃料研究取得进展：了解绿色柴油的物理和化学特性

Revista Mexicana de Física Pub Date : 2024-07-01 DOI: 10.31349/revmexfis.70.041701

Luis Verduzco, G. Marroqu´ın-Sanchez, M. J. Hernández Sánchez

{"title":"Advancements in biofuel research: Understanding the physical and chemical characteristics of green diesel","authors":"Luis Verduzco, G. Marroqu´ın-Sanchez, M. J. Hernández Sánchez","doi":"10.31349/revmexfis.70.041701","DOIUrl":"https://doi.org/10.31349/revmexfis.70.041701","url":null,"abstract":"Green diesel is a potential biofuel that offers certain advantages over traditional fossil diesel, such as low environmental pollution and no sulfur. However, there is little information available regarding the density and viscosity of green diesel, which is crucial for the quality control of biofuels and their performance in engines. In this study, the properties of green diesel produced from palm and soybean oils hydrotreatment were investigated, and models were developed to predict the physical properties of green diesel and n-alkanes. The experimental measurements had uncertainties of 1×10-4 g/cm3 and 1×10-2 mPa s in density and viscosity, respectively. The models were found to be in good agreement with the experimental values. The study highlights the importance of density and viscosity for quality control and engine performance of biofuels. The developed models for predicting the physical properties of green diesel and n-alkanes can be useful for quality control and optimization of biofuel production processes. The findings can be useful for researchers, engineers, and policymakers working in the field of biofuels and renewable energy. Further research is needed to explore the applicability of the developed models to other types of biofuels and to investigate the environmental and economic sustainability of green diesel production.","PeriodicalId":207412,"journal":{"name":"Revista Mexicana de Física","volume":"17 8","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141698452","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

Studying the ability of olive leaves nanoparticles to reduce free radicals resulting from the effect of gamma rays on water 研究橄榄叶纳米粒子减少伽马射线对水的影响所产生的自由基的能力

Revista Mexicana de Física Pub Date : 2024-07-01 DOI: 10.31349/revmexfis.70.041101

Omar S. Ashour, A. Al-Mashhadani

引用次数: 0

Efectos del desorden estructural sobre el cambio en el índice de refracción de un sistema δ-dopado simple en GaAs 结构无序对砷化镓中单一δ掺杂体系折射率变化的影响

Revista Mexicana de Física Pub Date : 2024-07-01 DOI: 10.31349/revmexfis.70.041001

H. Noverola-Gamas, Fermín Martínez-Solís, O. Oubram

{"title":"Efectos del desorden estructural sobre el cambio en el índice de refracción de un sistema δ-dopado simple en GaAs","authors":"H. Noverola-Gamas, Fermín Martínez-Solís, O. Oubram","doi":"10.31349/revmexfis.70.041001","DOIUrl":"https://doi.org/10.31349/revmexfis.70.041001","url":null,"abstract":"Partiendo de la teoría de masa efectiva y el modelo de Thomas-Fermi (TF) se ha establecidoel perfil de potencial para un sistema tipo delta-dopado simple en Arseniuro de Galio(GaAs) tipo n. Resolviendo la ecuación de Schrödinger asociada al sistema, se han calculadolos autovalores y las autofunciones del perfil de potencial, determinando así su estructura electrónica.Con ayuda de la teoría de Matriz Densidad se ha determinado el cambio en el índicede refracción (CIR) lineal y no lineal del sistema. De tal manera que, añadiendo un término dedesorden en el sistema (ζ), es posible calcular numéricamente los cambios en la estructura electrónicay las propiedades ópticas no lineales. Se ha determinado que con valores de ζ alrededordel 10% asociado a la densidad de impurezas (N2D), el cambio en el índice de refracción linealy no lineal no sufre cambios significativos. Por otro lado, cuando se incrementa el desorden enla densidad de impurezas introducidas en el material semiconductor, el comportamiento de lapropiedad óptica se pierde por completo. Finalmente, notamos que al introducir desorden enla intensidad del laser, la propiedad óptica no sufre cambios. El presente estudio teórico podríapredecir el efecto del desorden estructural sobre el comportamiento del CIR en los dispositivosbasados en delta dopados al momento de su síntesis.","PeriodicalId":207412,"journal":{"name":"Revista Mexicana de Física","volume":"42 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141709646","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

Bohr postulates derived from the toroidal electron model 从环形电子模型推导出的玻尔公设

Revista Mexicana de Física Pub Date : 2024-07-01 DOI: 10.31349/revmexfis.70.040201

Dos Santos Carlos A. M., Mario Da Luz

引用次数: 0

Complex band structure of thermal wave crystals: The plane-wave method 热波晶体的复杂带状结构：平面波方法

Revista Mexicana de Física Pub Date : 2024-05-01 DOI: 10.31349/revmexfis.70.031601

Cesar Augusto Romero-Ramos, B. Manzanares-Martínez, Diego Soto-Puebla, J. Manzanares-Martinez

引用次数: 0

Comparative study of alpha scattering from various nuclei at 130 MeV: Microscopic potentials and coupled channel calculations 130 兆电子伏各种原子核的阿尔法散射比较研究：微观势能和耦合通道计算

Revista Mexicana de Física Pub Date : 2024-05-01 DOI: 10.31349/revmexfis.70.031202

A. Ibraheem, F. Alasmary, B. Alshahrani, M. Karakoç, Shigetaka Hamada, M. N. El-Hammamy

引用次数: 0

Differences in violin sounds caused by changes on arching profiles 弓形变化造成的小提琴音色差异

Revista Mexicana de Física Pub Date : 2024-05-01 DOI: 10.31349/revmexfis.70.031002

Jesús Alejandro Torres

{"title":"Differences in violin sounds caused by changes on arching profiles","authors":"Jesús Alejandro Torres","doi":"10.31349/revmexfis.70.031002","DOIUrl":"https://doi.org/10.31349/revmexfis.70.031002","url":null,"abstract":"An experimentally calibrated numerical model was employed to examine the vibroacoustic impact of the arching profile in a violin soundbox, a study unattainable through experimental means alone. The finite element method successfully modeled the soundbox using the material properties of an actual violin, albeit with a simplified representation of the coupling with the air in the cavity and the forces from the strings. Achieving agreement with the real counterpart necessitated careful adjustment of the modal damping in the simulation. Damped models of violins are infrequently encountered. The impulse response of the soundbox model was obtained through the calculation of thousands of substeps induced by forced vibration. To streamline the time-domain analysis, the superimposed method was implemented instead of the more commonly used full option, resulting in a significant reduction in computational time. Additionally, synthetic musical notes, accounting for how the force of the strings is transmitted through the bridge, were employed as input to the soundbox model. Subsequently, the impulse responses were convolved with the synthetic notes to generate sounds. Through these procedures, the violin’s performance was assessed as the height of the arching profile of the plates was adjusted. The results demonstrated that higher arching profiles led to a general increase in the resonant frequencies of the violin, perceptible in the sound generated by the model.","PeriodicalId":207412,"journal":{"name":"Revista Mexicana de Física","volume":"36 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141047960","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

Light refraction in the Earth’s atmosphere III. Inferior mirages: images locus 地球大气中的光折射 III.下层海市蜃楼：图像位置

Revista Mexicana de Física Pub Date : 2024-05-01 DOI: 10.31349/revmexfis.70.031301

Alicia Cruzado, C. Alejandro Paola, A. Cesanelli

{"title":"Light refraction in the Earth’s atmosphere III. Inferior mirages: images locus","authors":"Alicia Cruzado, C. Alejandro Paola, A. Cesanelli","doi":"10.31349/revmexfis.70.031301","DOIUrl":"https://doi.org/10.31349/revmexfis.70.031301","url":null,"abstract":"Our main goal is to find the locus of images formed as a result of an inferior mirage. To achieve our goal we show, at first, that, provided the beam entering a detection system has a small aperture, the image of a point object formed by that system in a vertical plane passing through the object is a point, regardless of whether the image formed by an optical system previously traversed by the beam has generated a non-point image of the object. Secondly, we show that the different images formed by the detection system, as its position relative to the object varies, are located on the caustic curve corresponding to the previously traversed optical system. Next, we have found the analytical expressions of the caustic curves corresponding to two particular cases, one of them being the inferior mirages. These expressions have been found by means of the Legendre antitransform of the asymptotic lines to the paths of light rays reaching the detector. For the case of inferior mirages, we have studied in detail the locus of the images in each vertical plane passing through the object as a function of the position of the object relative to the ground, its position relative to the detector, and the atmospheric conditions. Finally, we get somewhat into the matter of the images position as they would be seen by a casual observer of an inferior mirage.","PeriodicalId":207412,"journal":{"name":"Revista Mexicana de Física","volume":"27 8","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141031316","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

Vortex magnetic induction: Mathematical, geometric and experimental characterization. 涡旋磁感应：数学、几何和实验特征。

Revista Mexicana de Física Pub Date : 2024-05-01 DOI: 10.31349/revmexfis.70.030901

Ángel David Ramírez Galindo, Huetzin Pérez Olivas, Gustavo Basurto Islas, A. Hernandez Rayas, Fernando González López, Teodoro Córdova Fraga

引用次数: 0

Medición directa de la polarización de la luz 直接测量光的偏振

Revista Mexicana de Física Pub Date : 2024-05-01 DOI: 10.31349/revmexfis.70.031304

Jesús Feliciano Zenón, Manuel Fernández-Guasti

引用次数: 0