1 resultado para Hugo Chávez. Venezuela. Veja magazine. Media. News coverage.Manipulation. Disqualification policy
em Abertay Research Collections - Abertay University’s repository
Filtro por publicador
- Aberdeen University (1)
- Abertay Research Collections - Abertay University’s repository (1)
- Academic Archive On-line (Jönköping University; Sweden) (3)
- Academic Archive On-line (Stockholm University; Sweden) (1)
- Adam Mickiewicz University Repository (7)
- AMS Tesi di Dottorato - Alm@DL - Università di Bologna (3)
- AMS Tesi di Laurea - Alm@DL - Università di Bologna (1)
- Andina Digital - Repositorio UASB-Digital - Universidade Andina Simón Bolívar (17)
- Applied Math and Science Education Repository - Washington - USA (1)
- ArchiMeD - Elektronische Publikationen der Universität Mainz - Alemanha (2)
- Archive of European Integration (5)
- Argos - Repositorio Institucional de la Secretaría de Investigación y Postgrado de la Facultad de Humanidades y Ciencias Sociales de la Universidad Nacional de Misiones (1)
- Aston University Research Archive (17)
- Biblioteca de Teses e Dissertações da USP (1)
- Biblioteca Digital | Sistema Integrado de Documentación | UNCuyo - UNCUYO. UNIVERSIDAD NACIONAL DE CUYO. (1)
- Biblioteca Digital da Produção Intelectual da Universidade de São Paulo (3)
- Biblioteca Digital da Produção Intelectual da Universidade de São Paulo (BDPI/USP) (43)
- Biblioteca Digital de la Universidad del Valle - Colombia (2)
- Bibloteca do Senado Federal do Brasil (92)
- BORIS: Bern Open Repository and Information System - Berna - Suiça (14)
- Brock University, Canada (3)
- Bucknell University Digital Commons - Pensilvania - USA (1)
- Bulgarian Digital Mathematics Library at IMI-BAS (1)
- CentAUR: Central Archive University of Reading - UK (9)
- CiencIPCA - Instituto Politécnico do Cávado e do Ave, Portugal (10)
- Cochin University of Science & Technology (CUSAT), India (2)
- Coffee Science - Universidade Federal de Lavras (3)
- Comissão Econômica para a América Latina e o Caribe (CEPAL) (2)
- Consorci de Serveis Universitaris de Catalunya (CSUC), Spain (15)
- CORA - Cork Open Research Archive - University College Cork - Ireland (4)
- Corvinus Research Archive - The institutional repository for the Corvinus University of Budapest (11)
- Digital Archives@Colby (7)
- Digital Commons @ DU | University of Denver Research (1)
- Digital Commons at Florida International University (23)
- Digital Peer Publishing (1)
- DigitalCommons@The Texas Medical Center (1)
- DigitalCommons@University of Nebraska - Lincoln (2)
- Doria (National Library of Finland DSpace Services) - National Library of Finland, Finland (9)
- DRUM (Digital Repository at the University of Maryland) (3)
- Duke University (1)
- Illinois Digital Environment for Access to Learning and Scholarship Repository (3)
- Instituto Politécnico de Viseu (4)
- Instituto Politécnico do Porto, Portugal (8)
- Iowa Publications Online (IPO) - State Library, State of Iowa (Iowa), United States (1)
- Memoria Académica - FaHCE, UNLP - Argentina (22)
- Ministerio de Cultura, Spain (10)
- Portal de Revistas Científicas Complutenses - Espanha (14)
- QSpace: Queen's University - Canada (4)
- QUB Research Portal - Research Directory and Institutional Repository for Queen's University Belfast (5)
- RDBU - Repositório Digital da Biblioteca da Unisinos (5)
- ReCiL - Repositório Científico Lusófona - Grupo Lusófona, Portugal (4)
- Repositorio Académico de la Universidad Nacional de Costa Rica (2)
- Repositório Científico da Universidade de Évora - Portugal (1)
- Repositório Científico do Instituto Politécnico de Lisboa - Portugal (28)
- Repositório da Escola Nacional de Administração Pública (ENAP) (1)
- Repositório da Produção Científica e Intelectual da Unicamp (5)
- Repositório da Universidade Federal do Espírito Santo (UFES), Brazil (3)
- Repositorio de la Universidad de Cuenca (1)
- Repositório digital da Fundação Getúlio Vargas - FGV (7)
- Repositório Institucional da Universidade de Brasília (1)
- Repositorio Institucional de la Universidad de El Salvador (1)
- Repositório Institucional UNESP - Universidade Estadual Paulista "Julio de Mesquita Filho" (48)
- RUN (Repositório da Universidade Nova de Lisboa) - FCT (Faculdade de Cienecias e Technologia), Universidade Nova de Lisboa (UNL), Portugal (9)
- Scielo Saúde Pública - SP (12)
- Universidad Autónoma de Nuevo León, Mexico (2)
- Universidad de Alicante (8)
- Universidad del Rosario, Colombia (101)
- Universidad Politécnica de Madrid (5)
- Universidade Complutense de Madrid (2)
- Universidade do Minho (5)
- Universidade dos Açores - Portugal (2)
- Universidade Federal do Pará (2)
- Universidade Federal do Rio Grande do Norte (UFRN) (11)
- Universidade Metodista de São Paulo (26)
- Universitätsbibliothek Kassel, Universität Kassel, Germany (1)
- Université de Lausanne, Switzerland (12)
- Université de Montréal (1)
- Université de Montréal, Canada (7)
- University of Canberra Research Repository - Australia (2)
- University of Connecticut - USA (1)
- University of Michigan (11)
- University of Queensland eSpace - Australia (125)
- University of Southampton, United Kingdom (1)
- University of Washington (2)
- WestminsterResearch - UK (4)
- Worcester Research and Publications - Worcester Research and Publications - UK (1)
Resumo:
Context. Recent observations of brown dwarf spectroscopic variability in the infrared infer the presence of patchy cloud cover. Aims. This paper proposes a mechanism for producing inhomogeneous cloud coverage due to the depletion of cloud particles through the Coulomb explosion of dust in atmospheric plasma regions. Charged dust grains Coulomb-explode when the electrostatic stress of the grain exceeds its mechanical tensile stress, which results in grains below a critical radius a < a Coul crit being broken up. Methods. This work outlines the criteria required for the Coulomb explosion of dust clouds in substellar atmospheres, the effect on the dust particle size distribution function, and the resulting radiative properties of the atmospheric regions. Results. Our results show that for an atmospheric plasma region with an electron temperature of Te = 10 eV (≈105 K), the critical grain radius varies from 10−7 to 10−4 cm, depending on the grains’ tensile strength. Higher critical radii up to 10−3 cm are attainable for higher electron temperatures. We find that the process produces a bimodal particle size distribution composed of stable nanoscale seed particles and dust particles with a ≥ a Coul crit , with the intervening particle sizes defining a region devoid of dust. As a result, the dust population is depleted, and the clouds become optically thin in the wavelength range 0.1–10 μm, with a characteristic peak that shifts to higher wavelengths as more sub-micrometer particles are destroyed. Conclusions. In an atmosphere populated with a distribution of plasma volumes, this will yield regions of contrasting radiative properties, thereby giving a source of inhomogeneous cloud coverage. The results presented here may also be relevant for dust in supernova remnants and protoplanetary disks.