1,720,976 research outputs found
Caractérisation de la nouvelle chambre de simulation atmosphérique CHARME et étude de la réaction d’ozonolyse d’un COV biogénique, le γ-terpinène
No full textThe study of atmospheric processes is among the central topics of current environmental research. The most direct and significant way to investigate the transformation of pollutants and the formation of aerosols in the atmosphere, is to simulate these processes under controlled and simplified conditions. In this regard, a new simulation chamber, CHARME (CHamber for the Atmospheric Reactivity and the Metrology of the Environment) has been designed in the Laboratory of Physico-Chemistry of the Atmosphere (LPCA) in the University of Littoral Côte d’Opale (ULCO). CHAE is also dedicated to the development and validation of new spectroscopic approaches for the metrology of atmospheric species including gases, particles and radicals.The first aim of this research was to characterize all the technical, physical and chemical parameters of this new chamber and to optimize the methods for studying the atmospheric reactivity of volatile organic compounds (VOCs) and simulating the formation of secondary organic aerosols (SOA). The results of numerous experiments and tests show that CHARME is a convenient tool to reproduce chemical reactions occurring in the troposphere. The second research objective was to investigate the reaction of the biogenic VOC, γ-terpinene, with ozone. The rate coefficient at (294 ± 2) K and atmospheric pressure was determined and the gas-phase oxidation products were identified. The physical state and hygroscopicity of the secondary organic aerosols was also studied. To our knowledge, this work represents the first study on SOA formation from the ozonolysis of γ-terpinene.L’étude des mécanismes et interactions atmosphériques est un des sujets majeurs actuels de recherches environnementales. La façon la plus directe et pertinente pour étudier la transformation des polluants et la formation des aérosols dans l'atmosphère est de simuler les processus dans des conditions contrôlées et simplifiées. Une nouvelle chambre de simulation CHARME (CHamber for the Atmospheric Reactivity and the Metrology of the Environment) a été développée au Laboratoire de Physico-Chimie Atmosphérique (LPCA) de l’Université du Littoral Côte d’Opale (ULCO). CHARME est également dédiée à la validation de dispositifs optiques utilisés pour la métrologie d’espèces atmosphériques stables et instables (radicaux). La première partie de ces travaux de recherche concerne la caractérisation de tous les paramètres techniques, physiques et chimiques de cette nouvelle chambre et l’optimisation des méthodes pour étudier la réactivité des composés organiques volatiles (COV) et simuler la formation d’aérosols organiques secondaires (AOS). Les résultats obtenus démontrent que CHARME est un outil adapté pour reproduire les réactions se produisant dans la troposphère. La deuxième partie est dédiée à l’étude de la réaction d’ozonolyse d’un COV biogénique, le γ-terpinène. La constante de vitesse à (294 ± 2) K et la pression atmosphérique a été mesurée et les produits d’oxydation identifiés dans la phase gazeuse. L’hygroscopicité des aérosols organiques secondaires a également été étudiée. A notre connaissance, ce travail représente la première étude sur la formation des AOS à partir de l’ozonolyse du γ-terpinène
Characterization of the new atmospheric simulation chamber CHARME, and study of the ozonolysis reaction of a biogenic VOC, the γ-terpinene
No full textL’étude des mécanismes et interactions atmosphériques est un des sujets majeurs actuels de recherches environnementales. La façon la plus directe et pertinente pour étudier la transformation des polluants et la formation des aérosols dans l'atmosphère est de simuler les processus dans des conditions contrôlées et simplifiées. Une nouvelle chambre de simulation CHARME (CHamber for the Atmospheric Reactivity and the Metrology of the Environment) a été développée au Laboratoire de Physico-Chimie Atmosphérique (LPCA) de l’Université du Littoral Côte d’Opale (ULCO). CHARME est également dédiée à la validation de dispositifs optiques utilisés pour la métrologie d’espèces atmosphériques stables et instables (radicaux). La première partie de ces travaux de recherche concerne la caractérisation de tous les paramètres techniques, physiques et chimiques de cette nouvelle chambre et l’optimisation des méthodes pour étudier la réactivité des composés organiques volatiles (COV) et simuler la formation d’aérosols organiques secondaires (AOS). Les résultats obtenus démontrent que CHARME est un outil adapté pour reproduire les réactions se produisant dans la troposphère. La deuxième partie est dédiée à l’étude de la réaction d’ozonolyse d’un COV biogénique, le γ-terpinène. La constante de vitesse à (294 ± 2) K et la pression atmosphérique a été mesurée et les produits d’oxydation identifiés dans la phase gazeuse. L’hygroscopicité des aérosols organiques secondaires a également été étudiée. A notre connaissance, ce travail représente la première étude sur la formation des AOS à partir de l’ozonolyse du γ-terpinène.The study of atmospheric processes is among the central topics of current environmental research. The most direct and significant way to investigate the transformation of pollutants and the formation of aerosols in the atmosphere, is to simulate these processes under controlled and simplified conditions. In this regard, a new simulation chamber, CHARME (CHamber for the Atmospheric Reactivity and the Metrology of the Environment) has been designed in the Laboratory of Physico-Chemistry of the Atmosphere (LPCA) in the University of Littoral Côte d’Opale (ULCO). CHAE is also dedicated to the development and validation of new spectroscopic approaches for the metrology of atmospheric species including gases, particles and radicals.The first aim of this research was to characterize all the technical, physical and chemical parameters of this new chamber and to optimize the methods for studying the atmospheric reactivity of volatile organic compounds (VOCs) and simulating the formation of secondary organic aerosols (SOA). The results of numerous experiments and tests show that CHARME is a convenient tool to reproduce chemical reactions occurring in the troposphere. The second research objective was to investigate the reaction of the biogenic VOC, γ-terpinene, with ozone. The rate coefficient at (294 ± 2) K and atmospheric pressure was determined and the gas-phase oxidation products were identified. The physical state and hygroscopicity of the secondary organic aerosols was also studied. To our knowledge, this work represents the first study on SOA formation from the ozonolysis of γ-terpinene
Caractérisation de la nouvelle chambre de simulation atmosphérique CHARME et étude de la réaction d’ozonolyse d’un COV biogénique, le γ-terpinène
No full textThe study of atmospheric processes is among the central topics of current environmental research. The most direct and significant way to investigate the transformation of pollutants and the formation of aerosols in the atmosphere, is to simulate these processes under controlled and simplified conditions. In this regard, a new simulation chamber, CHARME (CHamber for the Atmospheric Reactivity and the Metrology of the Environment) has been designed in the Laboratory of Physico-Chemistry of the Atmosphere (LPCA) in the University of Littoral Côte d’Opale (ULCO). CHAE is also dedicated to the development and validation of new spectroscopic approaches for the metrology of atmospheric species including gases, particles and radicals.The first aim of this research was to characterize all the technical, physical and chemical parameters of this new chamber and to optimize the methods for studying the atmospheric reactivity of volatile organic compounds (VOCs) and simulating the formation of secondary organic aerosols (SOA). The results of numerous experiments and tests show that CHARME is a convenient tool to reproduce chemical reactions occurring in the troposphere. The second research objective was to investigate the reaction of the biogenic VOC, γ-terpinene, with ozone. The rate coefficient at (294 ± 2) K and atmospheric pressure was determined and the gas-phase oxidation products were identified. The physical state and hygroscopicity of the secondary organic aerosols was also studied. To our knowledge, this work represents the first study on SOA formation from the ozonolysis of γ-terpinene.L’étude des mécanismes et interactions atmosphériques est un des sujets majeurs actuels de recherches environnementales. La façon la plus directe et pertinente pour étudier la transformation des polluants et la formation des aérosols dans l'atmosphère est de simuler les processus dans des conditions contrôlées et simplifiées. Une nouvelle chambre de simulation CHARME (CHamber for the Atmospheric Reactivity and the Metrology of the Environment) a été développée au Laboratoire de Physico-Chimie Atmosphérique (LPCA) de l’Université du Littoral Côte d’Opale (ULCO). CHARME est également dédiée à la validation de dispositifs optiques utilisés pour la métrologie d’espèces atmosphériques stables et instables (radicaux). La première partie de ces travaux de recherche concerne la caractérisation de tous les paramètres techniques, physiques et chimiques de cette nouvelle chambre et l’optimisation des méthodes pour étudier la réactivité des composés organiques volatiles (COV) et simuler la formation d’aérosols organiques secondaires (AOS). Les résultats obtenus démontrent que CHARME est un outil adapté pour reproduire les réactions se produisant dans la troposphère. La deuxième partie est dédiée à l’étude de la réaction d’ozonolyse d’un COV biogénique, le γ-terpinène. La constante de vitesse à (294 ± 2) K et la pression atmosphérique a été mesurée et les produits d’oxydation identifiés dans la phase gazeuse. L’hygroscopicité des aérosols organiques secondaires a également été étudiée. A notre connaissance, ce travail représente la première étude sur la formation des AOS à partir de l’ozonolyse du γ-terpinène
Development of a method to investigate nucleation thresholds in the ozonolysis of various biogenic volatile organic compounds
No full textRapport de stage de M2 Encadrement : Véronique RIFFAULT, Alexandre TOMA
Development of a method to investigate nucleation thresholds in the ozonolysis of various biogenic volatile organic compounds
No full textRapport de stage de M2 Encadrement : Véronique RIFFAULT, Alexandre TOMA
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
MONITORING THE IMPLEMENTATION OF AN INNOVATIVE INTERVENTION: THE CASE OF ENHANCING MICROSOFT OFFICE SKILLS IN FIFTH GRADE ENGLISH CLASS AT A LEBANESE PUBLIC SCHOOL
Get PDFSaouma BouJaoude; Ghazi Ghaith; Yara Hilal Jurdi;This study aimed at understanding the benefits and challenges of implementing a small scale, technology integration intervention in a Lebanese public K-6 school. The purpose was to examine the implementation of a small scale innovative intervention with the aim of improving its design and making it responsive to the context of the school. A Technology Integration English Unit using UbD framework was developed based on the official Lebanese curriculum for Grade 5 along with an implementation plan which contributes to school improvement within a specific context. The unit emphasized using technology tools such as Microsoft Office tools in the learning activities and was integrated in Grade 5 English classes over a period of four weeks. This study employed an action research design and covered pre and post methods of data collection such as test scores, observation tools, and teachers’ and students’ interviews. Data were analyzed using quantitative and qualitative analysis methods. The results indicate a positive impact of the intervention on student learning and a positive change on the teachers’ views on the usefulness of integrating technology in their English classes. Moreover, teachers’ reflections on the facilitating and hindering factors that affected the implementation of the technology integration intervention were in alignment with what the literature has previously recorded on the factors that are influential to the success of innovative interventions at schools. The study concludes with implications for practice and suggestions for future research
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