Pub Date : 2020-01-01DOI: 10.31527/analesafa.2019.30.4.79
C. L. Di Prinzio, P. I. Achával, D. Stoler, G. AGUIRRE VARELA
In this work, the migration of the three-dimensional (3D) spherical crystal in the presence of mobile particles using aMonte Carlo algorithm was studied. Different concentrations of particles (f) and different particles mobilities (Mp)were used. It was found that the grain size reaches a critical radius (Rc) which depends exclusively onf. This dependence can be written as:Rc~f^1/3. The dynamic equation of grain size evolution and its analytical solution were alsofound. The analytical solution successfully fits the simulation results. The particles fraction in the grain boundary wasalso found analytically and it fits with the computational data.
{"title":"KINETIC EVOLUTION OF A 3D SPHERICAL CRYSTAL WITH MOBILE PARTICLESUSING MONTE CARLO - PART II","authors":"C. L. Di Prinzio, P. I. Achával, D. Stoler, G. AGUIRRE VARELA","doi":"10.31527/analesafa.2019.30.4.79","DOIUrl":"https://doi.org/10.31527/analesafa.2019.30.4.79","url":null,"abstract":"In this work, the migration of the three-dimensional (3D) spherical crystal in the presence of mobile particles using aMonte Carlo algorithm was studied. Different concentrations of particles (f) and different particles mobilities (Mp)were used. It was found that the grain size reaches a critical radius (Rc) which depends exclusively onf. This dependence can be written as:Rc~f^1/3. The dynamic equation of grain size evolution and its analytical solution were alsofound. The analytical solution successfully fits the simulation results. The particles fraction in the grain boundary wasalso found analytically and it fits with the computational data.","PeriodicalId":41478,"journal":{"name":"Anales AFA","volume":"22 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81101981","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}
Pub Date : 2019-10-15DOI: 10.31527/analesafa.2019.30.3.47
P. I. Achával, C. L. Di Prinzio
In this paper the migration of a grain triple junction in apure ice sample with bubbles at -5°C was studied for almost 3hs. This allowed tracking the progress of the Grain Boundary (BG) and its interaction with the bubbles. The evolution of the grain triple junction was recorded from successive photographs obtained witha LEICA® optical microscope. Simultaneously, numerical simulations were carried out using Monte Carlo to obtain some physical parameters characteristic of the BG migration on ice.
{"title":"STUDY OF THE GRAIN BOUNDARY MIGRATION IN A TRICRISTAL PURE ICE WITH BUBBLES","authors":"P. I. Achával, C. L. Di Prinzio","doi":"10.31527/analesafa.2019.30.3.47","DOIUrl":"https://doi.org/10.31527/analesafa.2019.30.3.47","url":null,"abstract":"In this paper the migration of a grain triple junction in apure ice sample with bubbles at -5°C was studied for almost 3hs. This allowed tracking the progress of the Grain Boundary (BG) and its interaction with the bubbles. The evolution of the grain triple junction was recorded from successive photographs obtained witha LEICA® optical microscope. Simultaneously, numerical simulations were carried out using Monte Carlo to obtain some physical parameters characteristic of the BG migration on ice.","PeriodicalId":41478,"journal":{"name":"Anales AFA","volume":"40 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2019-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73805820","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}
Pub Date : 2019-10-15DOI: 10.31527/analesafa.2019.30.3.52
G. Varela, M. Ré, D. Flores
The purpose of this work is to use the divergence of Jensen-Shannon to compare spectra of cloud droplet sizes corresponding to different experimental conditions. Results of laboratory measurements are analyzed in which the diameter of droplets, produced by means of an ultrasonic nebulizer, are determined, subject to different movement conditions within a "cloudbox". The turbulence energy dissipation rate is particularly considered. The droplet spectra were approximated by the density kernel method.
{"title":"ANALYSIS OF CLOUD DROPLET SIZE SPECTRA BY JENSEN-SHANNON DIVERGENCE","authors":"G. Varela, M. Ré, D. Flores","doi":"10.31527/analesafa.2019.30.3.52","DOIUrl":"https://doi.org/10.31527/analesafa.2019.30.3.52","url":null,"abstract":"The purpose of this work is to use the divergence of Jensen-Shannon to compare spectra of cloud droplet sizes corresponding to different experimental conditions. Results of laboratory measurements are analyzed in which the diameter of droplets, produced by means of an ultrasonic nebulizer, are determined, subject to different movement conditions within a \"cloudbox\". The turbulence energy dissipation rate is particularly considered. The droplet spectra were approximated by the density kernel method.","PeriodicalId":41478,"journal":{"name":"Anales AFA","volume":"88 1 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2019-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82787894","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}
Pub Date : 2019-10-15DOI: 10.31527/analesafa.2019.30.3.58
S. Bustingorry, E. Moro, M. F. Laguna
Urged by the need of detailed information concerning the current situation of women in Physics in Argentina, we performed a statistical study focused on the Physics discipline within the hierarchical structure of researchers with permanent positions at CONICET. We analyzed gender composition data of the different career stages and studied its evolution in the past 20 years. The obtained results reveal the well-known glass ceiling and its dynamics, unveiling its relationship with differences arisen during the promotion process in the researchers' career. The analysis of evolution of the percentage of women in Physics shows that its projection would not surpass 30%. This result indicates that gender balance will not be reached unless novel mechanisms are proposed, actively promoting the incorporation of women as researchers. The results presented for Physics are also compared with others disciplines in Natural and Exact Sciences and the full population of researchers in all areas working in CONICET
{"title":"WOMEN IN PHYSICS IN ARGENTINA: A COMPARATIVE STATISTICAL ANALYSIS","authors":"S. Bustingorry, E. Moro, M. F. Laguna","doi":"10.31527/analesafa.2019.30.3.58","DOIUrl":"https://doi.org/10.31527/analesafa.2019.30.3.58","url":null,"abstract":"Urged by the need of detailed information concerning the current situation of women in Physics in Argentina, we performed a statistical study focused on the Physics discipline within the hierarchical structure of researchers with permanent positions at CONICET. We analyzed gender composition data of the different career stages and studied its evolution in the past 20 years. The obtained results reveal the well-known glass ceiling and its dynamics, unveiling its relationship with differences arisen during the promotion process in the researchers' career. The analysis of evolution of the percentage of women in Physics shows that its projection would not surpass 30%. This result indicates that gender balance will not be reached unless novel mechanisms are proposed, actively promoting the incorporation of women as researchers. The results presented for Physics are also compared with others disciplines in Natural and Exact Sciences and the full population of researchers in all areas working in CONICET","PeriodicalId":41478,"journal":{"name":"Anales AFA","volume":"83 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2019-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83794502","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}
Pub Date : 2019-07-01DOI: 10.31527/analesafa.2019.30.2.42
I. Novara, M. Matar, M.A. Parodi, A. Roatta, B. Gomez, C. Repetto
In this work we describe how we designed and built an acoustic system that allowed us to adapt a Kundt’s tube for the measurement of the speed of sound at different temperatures. The air column inside the tube was excited by a speaker at a frequency of 2 kHz. We changed the air column length by moving a piston throughout the tube, and we measured and recorded that length when we observed a resonance signal on the oscilloscope screen. This procedure was repeated at different temperatures, ranging from 19○C to 115○C. Then it was calculated the propagation of the speed of sound based on the temperature. The results were compared with those predicted by the classical model, which assumes that air is an ideal diatomic gas, and that the acoustic phenomenon is an adiabatic process. Finally, it was found a satisfactory agreement between the experimental values and those predicted by the classical model
{"title":"SET-UP OF A KUNDT’S TUBE TO OBTAIN THE SPEED OF SOUND AT\u0000DIFFERENT TEMPERATURES.","authors":"I. Novara, M. Matar, M.A. Parodi, A. Roatta, B. Gomez, C. Repetto","doi":"10.31527/analesafa.2019.30.2.42","DOIUrl":"https://doi.org/10.31527/analesafa.2019.30.2.42","url":null,"abstract":"In this work we describe how we designed and built an acoustic system that allowed us to adapt a Kundt’s tube for the measurement of the speed of sound at different temperatures. The air column inside the tube was excited by a speaker at a frequency of 2 kHz. We changed the air column length by moving a piston throughout the tube, and we measured and recorded that length when we observed a resonance signal on the oscilloscope screen. This procedure was repeated at different temperatures, ranging from 19○C to 115○C. Then it was calculated the propagation of the speed of sound based on the temperature. The results were compared with those predicted by the classical model, which assumes that air is an ideal diatomic gas, and that the acoustic phenomenon is an adiabatic process. Finally, it was found a satisfactory agreement between the experimental values and those predicted by the classical model","PeriodicalId":41478,"journal":{"name":"Anales AFA","volume":"188 6","pages":""},"PeriodicalIF":0.3,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72473113","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}
Pub Date : 2019-01-15DOI: 10.31527/ANALESAFA.2018.29.4.97
L. Cappelletti, N. D. Grosso, P. Cobelli
La dinámica de part́ıculas en flujos complejos es una temática de fundamental importancia tanto desde la f́ısica básica como desde el punto de vista de su implicancia para las ciencias atmosféricas y/u oceanográficas. Esto es particularmente cierto cuando se consideran fenómenos tales como el transporte de cenizas volcánicas, el transporte en meddies1 y la dispersión de islas de basura. Estos tres ejemplos arquet́ıpicos tienen en común la presencia de part́ıculas cuyo movimiento se da en un flujo complejo (alta variabilidad espacial y temporal). Por ello, resulta esencial disponer de mediciones de la dinámica de estas part́ıculas, tales como su velocidad y aceleración, lo que permitiŕıa profundizar la comprensión de procesos de f́ısica fundamental, como por ejemplo, las
{"title":"DEVELOPMENT OF A PARTICLE TRACKING VELOCIMETRY SYSTEM FOR THE LAGRANGIAN CHARACTERIZATION OF FLUID FLOWS","authors":"L. Cappelletti, N. D. Grosso, P. Cobelli","doi":"10.31527/ANALESAFA.2018.29.4.97","DOIUrl":"https://doi.org/10.31527/ANALESAFA.2018.29.4.97","url":null,"abstract":"La dinámica de part́ıculas en flujos complejos es una temática de fundamental importancia tanto desde la f́ısica básica como desde el punto de vista de su implicancia para las ciencias atmosféricas y/u oceanográficas. Esto es particularmente cierto cuando se consideran fenómenos tales como el transporte de cenizas volcánicas, el transporte en meddies1 y la dispersión de islas de basura. Estos tres ejemplos arquet́ıpicos tienen en común la presencia de part́ıculas cuyo movimiento se da en un flujo complejo (alta variabilidad espacial y temporal). Por ello, resulta esencial disponer de mediciones de la dinámica de estas part́ıculas, tales como su velocidad y aceleración, lo que permitiŕıa profundizar la comprensión de procesos de f́ısica fundamental, como por ejemplo, las","PeriodicalId":41478,"journal":{"name":"Anales AFA","volume":"19 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2019-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86065652","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}
Pub Date : 2019-01-01DOI: 10.31527/ANALESAFA.2019.30.2.31
D. Stoler, M. Lado, G. Varela, C. L. Di Prinzio
In this work the evolution of the width of a line (groove) traced on the surface of a sample of bi-crystalline ice, by means of a metallic sheet, in a direction almost orthogonal to the grain edge (BG) was studied. To perform the measurements, the sample of ice submerged in ultrapure silicone oil was maintained at -5 ºC to prevent evaporation from occurring and isolate the effect of surface diffusion in this way. Photographs of the groove were periodically taken, approximately for 100 hours, using a camera coupled to an optical microscope. From these images the evolution of the line width was studied. Finally, the ice self-diffusion coefficient was determined at -5 ºC.
{"title":"FLATTENING OF A SCRATCH ON ICE PURE SURFACE","authors":"D. Stoler, M. Lado, G. Varela, C. L. Di Prinzio","doi":"10.31527/ANALESAFA.2019.30.2.31","DOIUrl":"https://doi.org/10.31527/ANALESAFA.2019.30.2.31","url":null,"abstract":"In this work the evolution of the width of a line (groove) traced on the surface of a sample of bi-crystalline ice, by means of a metallic sheet, in a direction almost orthogonal to the grain edge (BG) was studied. To perform the measurements, the sample of ice submerged in ultrapure silicone oil was maintained at -5 ºC to prevent evaporation from occurring and isolate the effect of surface diffusion in this way. Photographs of the groove were periodically taken, approximately for 100 hours, using a camera coupled to an optical microscope. From these images the evolution of the line width was studied. Finally, the ice self-diffusion coefficient was determined at -5 ºC.","PeriodicalId":41478,"journal":{"name":"Anales AFA","volume":"14 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82055851","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}
Pub Date : 2019-01-01DOI: 10.31527/analesafa.2019.30.1.15
A. A. Santucho Cainzo, L. F. Calderari, D. Carrió, E. Jaén
This paper describes an alternative method to assess atmospheric pollution levels caused by the burning of sugar cane fields during the harvest, affecting visibility in nearby residential areas. The samples of atmospheric dispersed material were taken on glass slides exposed to the environment on different periods of time. The scattered light by these samples is measured using a digital goniometric device that moves a CCD around each sample with 2,0 arc min resolution. Scattering measurements reveals that it is possible to differentiate between the samples of 12, 24, 36 and 48 hours of integration. This method is more sensitive because it integrates through time, even when the concentrations of contaminants are low. Based on Beer-Lambert scattering model, the scattered light on the samples is related to the atmospheric extinction coefficient and the meteorological visibility measured in the same days. A good linear correlation for the different time periods (R2 > 0.94)was obtained. Finally, measured scattering levels were compared to the intraocular scattering ones calculated from CIE equation, obtaining similar values to eyes of 80 years old people
{"title":"MÉTODO ALTERNATIVO PARA LA EVALUACIÓN DE LA POLUCIÓN ATMOSFÉRICA CAUSADA POR LA QUEMA DE BIOMASA EN PLANTACIONES DE CAÑA DE AZUCAR","authors":"A. A. Santucho Cainzo, L. F. Calderari, D. Carrió, E. Jaén","doi":"10.31527/analesafa.2019.30.1.15","DOIUrl":"https://doi.org/10.31527/analesafa.2019.30.1.15","url":null,"abstract":"This paper describes an alternative method to assess atmospheric pollution levels caused by the burning of sugar cane fields during the harvest, affecting visibility in nearby residential areas. The samples of atmospheric dispersed material were taken on glass slides exposed to the environment on different periods of time. The scattered light by these samples is measured using a digital goniometric device that moves a CCD around each sample with 2,0 arc min resolution. Scattering measurements reveals that it is possible to differentiate between the samples of 12, 24, 36 and 48 hours of integration. This method is more sensitive because it integrates through time, even when the concentrations of contaminants are low. Based on Beer-Lambert scattering model, the scattered light on the samples is related to the atmospheric extinction coefficient and the meteorological visibility measured in the same days. A good linear correlation for the different time periods (R2 > 0.94)was obtained. Finally, measured scattering levels were compared to the intraocular scattering ones calculated from CIE equation, obtaining similar values to eyes of 80 years old people","PeriodicalId":41478,"journal":{"name":"Anales AFA","volume":"15 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79199972","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}
Pub Date : 2019-01-01DOI: 10.31527/ANALESAFA.2018.29.4.133
S. Jodra, A. Cuniberti
{"title":"CALORIMETRIC ANALYSIS OF FORMATION/DISSOLUTION OF GUINIER-PRESTON ZONES IN AN Al-Zn-Mg Alloy","authors":"S. Jodra, A. Cuniberti","doi":"10.31527/ANALESAFA.2018.29.4.133","DOIUrl":"https://doi.org/10.31527/ANALESAFA.2018.29.4.133","url":null,"abstract":"","PeriodicalId":41478,"journal":{"name":"Anales AFA","volume":"1 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75416557","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}
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