26 results on '"Matus, Pablo"'
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2. Marcos genéricos en las portadas de la prensa chilena sobre el estallido social de 2019
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Matus, Pablo, Vitores, Magdalena, Ramírez Friderichsen, Claudia, Matus, Pablo, Vitores, Magdalena, and Ramírez Friderichsen, Claudia
- Abstract
One of the most striking consequences of the social outbreak in Chile in 2019, from the perspective of communication studies, was the change in the perception and assessment of the media by the citizens. In this context, it is interesting to understand how the media represented that political and social phenomenon.Objective: To describe how the Chilean national and metropolitan press (El Mercurio, La Tercera, La Segunda, Las Últimas Noticias, La Cuarta, HoyxHoy, and Publimetro) reported on the social outbreak of 2019 on their covers from the perspective of their generic news frames.Methodology: A multimodal content analysis was conducted, simultaneously interpreting verbal and iconic messages related to the outbreak.Results: The most relevant frame in the coverage was conflict, followed by frames of human interest and attribution of responsibility. The economic consequences frame was much less important, while the morality frame only had a marginal contribution. Discussion: Given the interpretative nature of this analysis, we also evaluated the presence of two potential new generic frames: neutrality, which had low presence, and orientation, which turned out to be very important in one of the newspapers, and we believe it has potential for the study of the popular press.Conclusion: The orientation frame seems to be highly representative of the popular press, and therefore, it has the potential to become a generic frame applicable to other studies., Una de las consecuencias más llamativas del estallido social de 2019 en Chile, desde el punto de vista de los estudios en comunicación, fue el cambio en la percepción y valoración de los medios, por parte de la ciudadanía. En dicho contexto, es interesante saber cómo los medios representaron aquel fenómeno político-social. Objetivo: Describir cómo la prensa chilena de cobertura nacional y metropolitana (El Mercurio, La Tercera, La Segunda, Las Últimas Noticias, La Cuarta, HoyxHoy y Publimetro) informó sobre el estallido social de 2019 en sus portadas, desde la perspectiva de sus encuadres noticiosos genéricos. Metodología: Se realizó un análisis de contenido multimodal, es decir, que interpretara simultáneamente los mensajes verbales e icónicos alusivos al estallido. Resultados: El marco más relevante en la cobertura fue el de conflicto, seguido por los de interés humano y atribución de responsabilidad. Mucho menos importante fue el frame de consecuencias económicas, mientras que el de moralidad solo tuvo un aporte marginal. Discusión: Dado el carácter interpretativo de este análisis, evaluamos también la presencia de dos eventuales nuevos marcos genéricos: la neutralidad, que tuvo una baja presencia, y la orientación, que resultó ser muy importante en uno de los diarios, y creemos que tiene potencial para el estudio de la prensa popular. Conclusiones: El marco de orientación parece ser muy representativo de la prensa popular, y por ello tiene el potencial para convertirse en un frame genérico aplicable a otros estudios.
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- 2024
3. Role of the basin boundary conditions in gravity wave turbulence
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Deike, Luc, Miquel, Benjamin, Gutiérrez-Matus, Pablo, Jamin, Timothée, Semin, Benoit, Berhanu, Michael, Falcon, Eric, and Bonnefoy, Félicien
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Physics - Fluid Dynamics ,Nonlinear Sciences - Chaotic Dynamics ,Physics - Classical Physics - Abstract
Gravity wave turbulence is studied experimentally in a large wave basin where irregular waves are generated unidirectionally. The role of the basin boundary conditions (absorbing or reflecting) and of the forcing properties are investigated. To that purpose, an absorbing sloping beach opposite to the wavemaker can be replaced by a reflecting vertical wall. We observe that the wave field properties depend strongly on these boundary conditions. Quasi-one dimensional field of nonlinear waves propagate before to be damped by the beach whereas a more multidirectional wave field is observed with the wall. In both cases, the wave spectrum scales as a frequency-power law with an exponent that increases continuously with the forcing amplitude up to a value close to -4, which is the value predicted by the weak turbulence theory. The physical mechanisms involved are probably different according to the boundary condition used, but cannot be easily discriminated with only temporal measurements. We have also studied freely decaying gravity wave turbulence in the closed basin. No self-similar decay of the spectrum is observed, whereas its Fourier modes decay first as a time power law due to nonlinear mechanisms, and then exponentially due to linear viscous damping. We estimate the linear, nonlinear and dissipative time scales to test the time scale separation that highlights the important role of a large scale Fourier mode. By estimation of the mean energy flux from the initial decay of wave energy, the Kolmogorov-Zakharov constant is evaluated and found to be compatible with a recent theoretical value., Comment: Journal of Fluid Mechanics, Cambridge University Press (CUP), 2015, in press in JFM
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- 2014
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4. Buscando la adhesion de stakeholders: la responsabilidad y la eficacia como valores en las cartas de los CEO en las memorias de RSE en Chile/Seeking stakeholders: responsibility and effectiveness as values in letters from CEOS in the CSR reports in Chile/Procurando a adesao de stakeholders: a responsabilidade e a eficacia como valores nas cartas dos CEO nas memorias de RSE no Chile
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Matus, Pablo
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- 2018
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5. Protective immunity against enteral stages of Trichinella spiralis elicited in mice by live attenuated Salmonella vaccine that secretes a 30-mer parasite epitope fused to the molecular adjuvant C3d-P28
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Pompa-Mera, Ericka N., Arroyo-Matus, Pablo, Ocaña-Mondragón, Alicia, González-Bonilla, César R., and Yépez-Mulia, Lilián
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- 2014
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6. La imagen obscena como dimensión escatológica en la publicidad de marcas de lujo
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Vergara Leyton, Enrique, Matus, Pablo, Edwards, Cristóbal, Vergara Leyton, Enrique, Matus, Pablo, and Edwards, Cristóbal
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Este artículo propone una reflexión sobre la imagen transgresora y su potencial comunicativo, tomando como objeto de estudio avisos publicitarios de marcas de lujo que han suscitado controversias públicas debido al carácter sexual de sus mensajes. Por medio de un marco conceptual, se aborda las imágenes publicitarias en su dimensión estética y simbólica, y se analizan desde un enfoque socio-semiótico para determinar su significación, intencionalidad comunicativa y referencias visuales. El análisis de imaginarios tabúes sobre relaciones afectivas revela una transgresión explícita al orden valórico tradicional que suelen manifestar las imágenes estereotipadas del mundo idealizado de la publicidad convencional., The purpose of this paper is to ponder over the communicational potential of images that go beyond limits. The subject of study is luxury brand visual advertisements that have faced public controversies due to the sexual content of their messages. A frame of reference approaches and images focusing on their aesthetic and symbolic dimensions to examine them from a socio-semiotic point of view and determine their significance, communicational purposefulness and visual references. The analysis of imaginary taboos regarding loving relationships reveals an explicit transgression of the established value order that advertising's stereotypical images of a perfect world often display.
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- 2022
7. Marco de desconfianza mediática: Una propuesta para entender el descrédito de los medios de comunicación
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Ramírez Friderichsen, Claudia, Matus, Pablo, Ramírez Friderichsen, Claudia, and Matus, Pablo
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Diversos estudios de opinión advierten que entre el público chileno se está masificando la creencia de que los medios informativos son serviles a poderes fácticos externos a ellos, y que por eso no representarían de manera correcta la realidad ni los intereses de las personas. Sin embargo, algunas investigaciones recientes demuestran que no existe una gran homogeneidad editorial y que los periodistas no se sienten presionados en su trabajo. Para intentar explicar esta brecha entre la desconfianza ciudadana hacia los medios y la realidad de su producción editorial, se propone un modelo basado en los conceptos de framing, industria cultural y aparatos ideológicos. Su conclusión es que en la cultura popular existiría un encuadre de desconfianza mediática difícil de desactivar.
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- 2022
8. Quantitative analysis of the convergence between public relations and sustainability: Application in Ecuadorian, Colombian, and Chilean businesses
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Durán, Ana María, primary, Vega, Melita, additional, Avila, Caroline, additional, Matus, Pablo, additional, and Orozco-Toro, Jaime Alberto, additional
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- 2022
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9. Procurando a adesão de stakeholders: a responsabilidade e a eficácia como valores nas cartas dos CEO nas memórias de RSE no Chile
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Matus, Pablo, Matus, Pablo, and Pontificia Universidad Católica de Chile
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Responsabilidad social empresarial ,Interest groups ,Rhetoric ,Sustainability reports ,Análise do discurso ,Responsabilidade social empresarial ,Relatório de sustentabilidade ,Reportes de sostenibilidad ,Análisis del discurso ,Grupos de interesse ,Corporate social responsibility ,Grupos de interés ,Retórica ,Discourse analysis - Abstract
This paper shows part of the results of a study on the rhetorical use of values in the communication of corporate social responsibility in Chile: In particular, an analysis of the discourse applied to the letters from Chief Executive Officers (CEOs) which were included in the reports of the ten companies that led the Corporate Sustainability Ranking, prepared in 2017 by the Prohumana Foundation. To face this challenge, a model of rhetorical - communicational analysis that considers argumentation principles by values was elaborated (Perelman and Olbrechts - Tyteca, 1994, Bellenger, 1992).The results show that the letters are addressed to a particular audience (the stakeholders), that they are hybrid rhetorical expressions (of judicial and epidictic nature), and that specific values, such as responsibility and effectiveness, prevail in them. These values pretend to logically and ethically sustain the companies’ argument or story, implying a level of agreement: The reader is committed not to discuss or deny himself in the existence of the validity of values and, from that perspective, he aspires to eliminate resistance or criticism of financial, environmental and social management. In this sense, the premise that sustainability reports are representative texts of corporate identity and strategies is confirmed. Este artigo mostra parte dos resultados de um estudo sobre o uso retórico dos valores na comunicação da responsabilidade social corporativa no Chile. Em particular, uma análise do discurso aplicada às cartas dos Chief Executive Officer (CEO) incluídas nos relatórios das dez companhias que lideraram o Ranking de sustentabilidade empresarial elaborado pela fundação Prohumana em 2017. Para enfrentar esse desafio, elaborou - se um modelo de análise retórica - comunicacional que considera princípios da argumentação por valores (Perelman e Olbrechts - Tyteca, 1994; Bellenger, 1992). Os resultados mostram que as cartas estão dirigidas a um público particular (os stakeholders), que são expressões retóricas híbridas (judiciais e epidícticas) e que nelas primam os valores concretos, como a responsabilidade e a eficácia. Esses valores pretendem sustentar lógica e eticamente o argumento ou relato das empresas, implicando um nível de acordo: aposta - se que o leitor não discutirá nem porá em dúvida a existência nem a vigência daqueles valores e, a partir dessa perspectiva, aspira - se a eliminar as resistências ou críticas ao gerenciamento financeiro, ambiental e social. Nesse sentido, corrobora - se a premissa de que as memórias de sustentabilidade são textos representativos da identidade corporativa e de suas estratégias. Este artículo muestra parte de los resultados de un estudio sobre el uso retórico de los valores en la comunicación de la responsabilidad social corporativa en Chile. En particular, un análisis del discurso aplicado a las cartas de los Chief Executive Officer (CEO) incluidas en los reportes de las diez compañías que lideraron el Ranking de sustentabilidad empresarial elaborado por la fundación Prohumana en 2017. Para enfrentar este desafío se elaboró un modelo de análisis retórico - comunicacional que considera principios de la argumentación por valores (Perelman y Olbrechts - Tyteca, 1994; Bellenger, 1992). Los resultados muestran que las cartas están dirigidas a un auditorio particular (los stakeholders), que son expresiones retóricas híbridas (judiciales y epidícticas) y que en ellas priman los valores concretos, como la responsabilidad y la eficacia. Estos valores pretenden sustentar lógica y éticamente el argumento o relato de las empresas, implicando un nivel de acuerdo: se apuesta a que el lector no discutirá ni pondrá en duda la existencia ni la vigencia de aquellos valores y, desde esa perspectiva, se aspira a eliminar las resistencias o críticas a la gestión financiera, ambiental y social. En ese sentido se corrobora la premisa de que las memorias de sostenibilidad son textos representativos de la identidad corporativa y sus estrategias. https://revistas.udem.edu.co/index.php/anagramas/article/view/2716
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- 2018
10. La apuesta de Coca-Cola Life como marca icono: una mirada desde el branding cultural
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Universidad de Sevilla. Departamento de Comunicación Audiovisual, Publicidad y Literatura, Sanz-Marcos, Paloma, Matus, Pablo, Vergara, Enrique, Universidad de Sevilla. Departamento de Comunicación Audiovisual, Publicidad y Literatura, Sanz-Marcos, Paloma, Matus, Pablo, and Vergara, Enrique
- Abstract
En 2013 se presentó en el mercado chileno Coca-Cola Life, una bebida carbonatada cuya principal característica es el uso de estevia como endulzante, lo que implica que tiene menos calorías y una composición más natural que la tradicional Coca-Cola. Sin embargo, y pese al auge del consumo verde —atento a los atributos ecológicos y sanitarios de los productos—, apenas dos años después de su lanzamiento las bajas ventas provocaron su retiro del mercado, situación que el producto ha vivido en otras latitudes. Desde un enfoque de branding cultural, la presente investigación describe las claves discursivas de la marca Coca-Cola Life para descubrir por qué no logró vincularse con los consumidores, pese a tener los atributos para ser considerada una «marca icono». Los resultados muestran que las campañas en Twitter en Chile (140 piezas entre 2013 y 2015) representaron de manera superficial las problemáticas e intereses ecologistas., In 2013, Coca-Cola Life was introduced to the Chilean market. It is a carbonated beverage whose main characteristic is the use of stevia as a sweetener, which meant that it have fewer calories and a more natural composition than regular Coke. However, and despite the boom in green consumption—more attentive to the ecological and sanitary attributes of products— two years after its launch, low sales led to its withdrawal from the market... a situation that the product has lived in other latitudes. From a cultural branding approach, this study describes the discursive keys of the Coca-Cola Life brand to discover why it failed to connect with consumers, despite having the attributes to be considered an ‘iconic brand.’ The results show that the campaigns on Twitter in Chile (140 ads, between 2013 and 2015) superficially represented environmental issues and interests.
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- 2020
11. La apuesta de Coca-Cola 'Life' como marca icono: Una mirada desde el 'branding' cultural
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Sanz Marcos, Paloma, Matus, Pablo, Vergara Leyton, Enrique, Sanz Marcos, Paloma, Matus, Pablo, and Vergara Leyton, Enrique
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In 2013, Coca-Cola Life was introduced to the Chilean market. It is a carbonated beverage whose main characteristic is the use of stevia as a sweetener, which meant that it have fewer calories and a more natural composition than regular Coke. However, and despite the boom in green consumption-more attentive to the ecological and sanitary attributes of products- two years after its launch, low sales led to its withdrawal from the market... a situation that the product has lived in other latitudes. From a cultural branding approach, this study describes the discursive keys of the Coca-Cola Life brand to discover why it failed to connect with consumers, despite having the attributes to be considered an ‘iconic brand.’ The results show that the campaigns on Twitter in Chile (140 ads, between 2013 and 2015) superficially represented environmental issues and interests.; En 2013 se lanza al mercado chileno Coca-Cola Life, una bebida carbonatada que utiliza la estevia como endulzante. Pese al auge del consumo, apenas dos años después de su lanzamiento las bajas ventas provocaron su retira del mercado. Desde un enfoque de branding cultural, la presente investigación describe las claves discursivas de la marca para descubrir por qué no logró vincularse con los consumidores, pese a tener los atributos para ser considerada una 'marca icono'. Los resultados muestran que las campañas en Twitter en Chile (140 piezas entre 2013 y 2015) representaron de manera superficial las problemáticas e intereses ecologistas.; 2013an, Coca-Cola Life aurkeztu zen Txileko merkatuan. Edari karbonatatu bat zen, eta haren ezaugarri nagusia zen estevia erabiltzea gozagarri gisa; hortaz, Coca-Cola tradizionalak baino kaloria gutxiago eta osaera naturalagoa zeukan. Hala ere, kontsumo berdearen gorakada gorabehera –produktuen ezaugarri ekologiko eta osasungarriei erne egonik–, jaulki zenetik bi urte eskas igarotakoan, merkatutik erretiratu zen salmenta baxuen ondorioz. Produktu horren kasuan, egoera hor
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- 2020
12. La apuesta de Coca-Cola Life como marca icono: Una mirada desde el branding cultural
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Sanz-Marcos, Paloma, primary, Matus, Pablo, additional, and Vergara, Enrique, additional
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- 2020
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13. La imagen obscena como dimensión escatológica en la publicidad de marcas de lujo.
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Vergara, Enrique, Matus, Pablo, and Edwards, Cristóbal
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BRAND image ,AWARENESS advertising ,TABOO ,ADVERTISING ,AESTHETICS - Abstract
Copyright of Questiones Publicitarias is the property of Universitat Autonoma de Barcelona and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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- 2022
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14. Quantitative analysis of the convergence between public relations and sustainability: Application in Ecuadorian, Colombian, and Chilean businesses
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Labarca, Claudia, Sadi, Gabriel, Damion, Waymer, Durán, Ana María, Vega, Melita, Avila, Caroline, Matus, Pablo, and Orozco-Toro, Jaime Alberto
- Abstract
The present study examines the relationship between public relations management and sustainability in large companies in Ecuador, Colombia, and Chile through an analysis of the results of an online survey of 96 in-house executives who were asked about five key management variables at their companies. The authors propose indicators that enable the measurement of the convergence between these two areas of management based on the premise that the desired sustainability among the organizations is not possible if there is no public relations management that encourages communication with publics, and paves the way for this to occur. The results reflect that, on average, organizations in the three countries show an orientation towards the common good, which is the most evolved scenario in the model. Key aspects subject to improvement are also identified so that public relations efforts can support sustainability processes based on the individual reality of each company.
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- 2022
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15. Stereotypes and Sexualization of Girls and Adolescent Girls in Chilean Advertising: A Case Study.
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Condeza-Dall'Orso, Rayén, Matus, Pablo, and Vergara-Leyton, Enrique
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TEENAGE girls ,TEENAGERS ,GENDER stereotypes ,STEREOTYPES ,ADVERTISING ,INFANTS - Abstract
This article presents a case study about three underwear and footwear advertising campaigns aimed at girls and adolescents in the context of the promotion of the back-to-school season in Chile in February 2020. The adverts caused social and media controversy. Social media users accused the brands of sexualizing children and adolescents' images for marketing and commercial ends. Based on an interpretative analysis of the graphic pieces involved in the campaigns, this article reflects on the representation of girls and adolescent girls. This research observes a resort to female gender stereotypes characteristic of the fashion industry extended to childhood. Considering that advertising is one of the main discursive axes central in the social and media construction of infancy, we discuss the risk of normalizing communication strategies which appeal to the increasingly earlier seduction and erotization of infant and adolescent bodies through mass media despite prevailing ethical and self-regulation codes in the country. [ABSTRACT FROM AUTHOR]
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- 2021
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16. Buscando la adhesión de stakeholders: la responsabilidad y la eficacia como valores en las cartas de los CEO en las memorias de RSE en Chile
- Author
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Matus, Pablo and Matus, Pablo
- Abstract
This paper shows part of the results of a study on the rhetorical use of values in the communication of corporate social responsibility in Chile: In particular, an analysis of the discourse applied to the letters from Chief Executive Officers (CEOs) which were included in the reports of the ten companies that led the Corporate Sustainability Ranking, prepared in 2017 by the Prohumana Foundation. To face this challenge, a model of rhetorical - communicational analysis that considers argumentation principles by values was elaborated (Perelman and Olbrechts - Tyteca, 1994, Bellenger, 1992).The results show that the letters are addressed to a particular audience (the stakeholders), that they are hybrid rhetorical expressions (of judicial and epidictic nature), and that specific values, such as responsibility and effectiveness, prevail in them. These values pretend to logically and ethically sustain the companies’ argument or story, implying a level of agreement: The reader is committed not to discuss or deny himself in the existence of the validity of values and, from that perspective, he aspires to eliminate resistance or criticism of financial, environmental and social management. In this sense, the premise that sustainability reports are representative texts of corporate identity and strategies is confirmed., Este artigo mostra parte dos resultados de um estudo sobre o uso retórico dos valores na comunicação da responsabilidade social corporativa no Chile. Em particular, uma análise do discurso aplicada às cartas dos Chief Executive Officer (CEO) incluídas nos relatórios das dez companhias que lideraram o Ranking de sustentabilidade empresarial elaborado pela fundação Prohumana em 2017. Para enfrentar esse desafio, elaborou - se um modelo de análise retórica - comunicacional que considera princípios da argumentação por valores (Perelman e Olbrechts - Tyteca, 1994; Bellenger, 1992). Os resultados mostram que as cartas estão dirigidas a um público particular (os stakeholders), que são expressões retóricas híbridas (judiciais e epidícticas) e que nelas primam os valores concretos, como a responsabilidade e a eficácia. Esses valores pretendem sustentar lógica e eticamente o argumento ou relato das empresas, implicando um nível de acordo: aposta - se que o leitor não discutirá nem porá em dúvida a existência nem a vigência daqueles valores e, a partir dessa perspectiva, aspira - se a eliminar as resistências ou críticas ao gerenciamento financeiro, ambiental e social. Nesse sentido, corrobora - se a premissa de que as memórias de sustentabilidade são textos representativos da identidade corporativa e de suas estratégias., Este artículo muestra parte de los resultados de un estudio sobre el uso retórico de los valores en la comunicación de la responsabilidad social corporativa en Chile. En particular, un análisis del discurso aplicado a las cartas de los Chief Executive Officer (CEO) incluidas en los reportes de las diez compañías que lideraron el Ranking de sustentabilidad empresarial elaborado por la fundación Prohumana en 2017. Para enfrentar este desafío se elaboró un modelo de análisis retórico - comunicacional que considera principios de la argumentación por valores (Perelman y Olbrechts - Tyteca, 1994; Bellenger, 1992). Los resultados muestran que las cartas están dirigidas a un auditorio particular (los stakeholders), que son expresiones retóricas híbridas (judiciales y epidícticas) y que en ellas priman los valores concretos, como la responsabilidad y la eficacia. Estos valores pretenden sustentar lógica y éticamente el argumento o relato de las empresas, implicando un nivel de acuerdo: se apuesta a que el lector no discutirá ni pondrá en duda la existencia ni la vigencia de aquellos valores y, desde esa perspectiva, se aspira a eliminar las resistencias o críticas a la gestión financiera, ambiental y social. En ese sentido se corrobora la premisa de que las memorias de sostenibilidad son textos representativos de la identidad corporativa y sus estrategias.
- Published
- 2018
17. Influencia de la cultura nacional en la gestión de comunicación para la sostenibilidad.
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María Durán, Ana, Vega, Melita, Matus, Pablo, Alberto Orozco-Toro, Jaime, and Avila, Caroline
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CORPORATE affairs executives ,PUBLIC interest ,COMMUNICATION strategies ,COMMUNICATION models ,COMMON good - Abstract
Copyright of Cuadernos.info is the property of Pontificia Universidad Catolica de Chile, Facultad de Comunicaciones and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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- 2020
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18. Desterritorialización, cultura internacional-popular e identidad en el cine: El caso del western chileno “Sal”
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Matus, Pablo, primary
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- 2018
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19. Discursive representation: Semiotics, theory, and method
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Matus, Pablo, primary
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- 2018
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20. Representaciones e imaginario del medio ambiente en la publicidad de empresas en Chile. Una aproximación desde avisos en diarios
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Matus, Pablo
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- 2016
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21. Effets induits en surface par un écoulement turbulent
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Gutiérrez-Matus, Pablo, Service de physique de l'état condensé (SPEC - UMR3680), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Ecole Polytechnique X, François Daviaud(francois.daviaud@cea.fr), and Gutiérrez-Matus, Pablo
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Turbulence ,ondes de surface ,[PHYS.PHYS.PHYS-FLU-DYN]Physics [physics]/Physics [physics]/Fluid Dynamics [physics.flu-dyn] ,free surface flows ,[PHYS.PHYS.PHYS-FLU-DYN] Physics [physics]/Physics [physics]/Fluid Dynamics [physics.flu-dyn] ,magnétohydrodynamique ,magnetohydrodynamics ,surface waves ,écoulements en surface libre - Abstract
We study surface manifestations of a turbulent flow from an experimental point of view. Specifically we study a turbulent flow in a thin layer of fluid (a liquid metal) with free surface. The flow is generated with an electromagnetic force. It exhibits interacting vortices, shear bands and waves, depending on the forcing conditions. We explored three consequences of the horizontal turbulent motion as observed on the surface: Surface deformation itself; the effects on propagating waves; and the effects on floating particles. Concerning the surface deformation: when the forcing strength is increased, we observe a linear increase of the surface level r.m.s. fluctuations up to 10% of the liquid layer thickness. Largest deformations, however, can reach a half of the layer thickness. Surface deformation is mainly produced by vortices, thus it is asymmetric through values under the mean. This contrast with observations in random sea waves and wave turbulence, were an asymmetry appears as well --this time through values above the mean--, as a consequence of sharp crests in steep gravity waves. The frequency spectrum of the deformation follows a power-law with an exponent close to -5, similar to the singularity spectrum of Phillips. Thus, we presented the statistical signature of vortical motion. We considered another aspect of the wave-turbulence relation: we mechanically induced a monochromatic wave over the turbulent flow. We measure a reduction and widening of the wave spectral peak that happens when turbulent motion is increased. Also, we computed coherent averages to emphasize the wavy part of the signal. We observe a spatial decay in wave content when turbulent motion is increased. Therefore, we quantified the enhancement of wave attenuation due to turbulence, and we observed its non trivial dependence on the wave frequency. Concerning dynamics of floating particles: We observe that particles have the tendency to form clusters, and we confirm this observation by developing a statistical method based on the areas defined by the position of three nearest neighbors. This tool allows us to clearly identify particles belonging to a cluster. Indeed, clustered particles exhibit much stronger velocity and angular correlations than the unconditioned case. Several mechanisms are susceptible to induce clustering of floating particles. We identify (i) particles' inertia, (ii) upwelling/downwelling flows and (iii) surface tension. For each mechanism we construct suitable quantities, which we correlate with the cumulated concentration of particles. These correlations suggest upwelling and downwelling motions as responsible for particles clustering., Nous nous intéressons aux effets en surface induits par un écoulement turbulent, en utilisant une approche expérimentale. Nous étudions un écoulement turbulent de faible épaisseur avec une surface libre. L'écoulement est produit dans un métal liquide à l'aide d'une force électromagnétique. Il présente des tourbillons, des bandes de cisaillement et des ondes, dépendent des conditions de forçage. Trois aspects ont été considérées: la déformation de surface engendré par la turbulence; les effets de la turbulence sur la propagation des ondes; et les effets de la turbulence sur des particules qui flottent à la surface. Concernant la déformation de surface : à mesure que l'on augmente l'intensité du forçage, l'écart type de la déformation augmente de façon linéaire, jusqu'à atteindre le 10% de l'épaisseur du fluide. Les déformations extrêmes peuvent atteindre la moitié de l'épaisseur. A faible forçage, la déformation de surface est principalement liée à la présence des tourbillons, impliquant une distribution de l'hauteur avec un facteur d'asymétrie négatif. Cette observation contraste avec la turbulence d'onde, où une asymétrie est aussi observée, mais avec un facteur d'asymétrie positif, notamment à cause des crêtes pointues dans les ondes de gravité. Le spectre en fréquence de la déformation présente une loi de puissance avec un exposant -5, similaire au spectre de singularité de Phillips. Ainsi, nous avons présenté les empreintes statistiques des tourbillons. Deuxièmement, nous avons considéré un autre aspect de la relation onde-écoulement turbulent : nous avons induit mécaniquement des ondes monochromatiques à la surface de l'écoulement. Lorsque l'écoulement deviens plus intense, nous avons mesure la décroissance et l'élargissement du mode associé à l'onde. Nous avons calculé une moyenne cohérente que souligne l'onde para rapport aux fluctuations turbulentes. Ceci nous permet d'observer la décroissance spatial de l'onde lorsque l'écoulement deviens plus intense. Ces analyses nous ont permit de quantifier une augmentation de l'atténuation des ondes à cause de la turbulence. Si l'on considère des particules qui flottent à la surface du liquide, on s'aperçoit qu'elles ont tendance à former des amas. Ce phénomène est confirmé par une analyse statistique des aires définies par la position des trois particules voisines. Ce faisant, on peut identifier clairement les particules qui appartiennent aux amas. De plus, ces particules présentent une corrélation très forte des vitesses et d'orientation angulaire. Plusieurs mécanismes physiques peuvent induire cette formation des amas: (i) l'inertie des particules ; (ii) des mouvements verticaux secondaires et ; (iii) la déformation de surface. Nous avons construit des quantités pour corréler les effets de concentration de particules avec ses mécanismes. Les corrélations plus importantes sont celles que concernent les mouvements verticaux secondaires, qui l'on interprète comme le mécanisme responsable des effets de concentration.
- Published
- 2013
22. ON THE INFLUENCE OF VORTICITY ON WAVE PROPAGATION AND WAVE TURBULENCE
- Author
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Gutierrez-Matus, Pablo
- Abstract
FONDECYT FONDECYT
- Published
- 2014
23. Comunicación Gubernamental en Acción: Narrativas Presidenciales y Mitos de Gobierno
- Author
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Avila, Caroline, primary and Matus, Pablo, additional
- Published
- 2016
- Full Text
- View/download PDF
24. Formas de la comunicación en las organizaciones. La 'comunicación estratégica' bajo la mirada de la Teoría de Sistemas Sociales
- Author
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Matus, Pablo
- Published
- 2010
- Full Text
- View/download PDF
25. Interacción de soluciónes localizadas estables en la vecindad de una bifurcación debilmente invertida
- Author
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GUTIERREZ MATUS, PABLO ANDRES, DESCALZI MUÑOZ, ORAZIO DANTE, TIRAPEGUI ZURBANO, ENRIQUE LINCOYAN, and UNIVERSIDAD DE CHILE
- Abstract
MAGISTER EN CIENCIAS C/M FISICA FONDECYT FONDECYT
- Published
- 2007
26. La distopía de las propagandas industrial y ambientalista.
- Author
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MATUS, PABLO
- Subjects
DYSTOPIAS ,POLITICAL philosophy ,MASS media & propaganda ,ORGANIZATIONAL communication ,ADVERTISING - Abstract
Copyright of Cuadernos de Información is the property of Pontificia Universidad Catolica de Chile, Facultad de Comunicaciones and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2011
- Full Text
- View/download PDF
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