Diffusion incohérente d'une onde électromagnétiquf à la fréquence hybride supérieure

Enhanced incoherent scattering at the upper hybrid layer of an extraordinary electromagnetic wave propagating in an inhomogeneous magnetized plasma has been observed.On a observé la diffusion incohérente amplifiée d'une onde électromagnétique, polarisée suivant le mode extraordinaire, liée à l'existence de la résonance hybride supérieure dans la propagation de l'onde à travers un magnéto-plasma inhomogène

Management Of Fishing Of The Broadband Anchovy (anchoviella Lepidentostole) (fowler, 1911), In South São Paulo State, Brazil [gestão Da Pesca De Manjuba (anchoviella Lepidentostole) (fowler, 1911) No Sul Do Estado De São Paulo, Brasil]

The broadband anchovy (Anchoviella lepidentostole) is one of the most important fishery resources for economic and social development of Iguape City and for the whole of the south coast of São Paulo state. Nowadays this activity involves over 2,500 fishermen. This paper aims to evaluate its fishing, and discuss how the activity is managed. In order to conduct this study, production data and catch per unit effort (CPUE) data from the 1998-2000 period have been collected, and the characterisation of the activity has also been done. A decline in broadband anchovy abundance had been observed in the region up until 2004, when a new regulation was implemented, in an attempt to recover the resource, with the establishment of closed season fishing (defeso) during the catch season, and adjustments in the employed fishing gear. The results have shown a recovery of the abundance of broadband anchovy throughout the 2005-2010 period, showing thus far that the measures taken for the maintenance of the resource have been successful. The activity has been managed through discussions involving people from the fishing sector in order to determine the controversial actions to be taken, that are hard to enforce. In order to achieve a more satisfactory resource management, it is necessary to keep the participatory process, with adaptive co-management, based on discussion among all the sectors involved (from government and society), and constant monitoring of the activity.734691697Armitage, D.R., Bekers, F., Doubleday, N., (2007) Adaptative co-management: Colaboration, learning and multi-level governance, p. 344. , Vancouver: University of British Columbia PressÁvila-Da-Silva, A.O., Carneiro, M.H., Fagundes, L., Gerenciador de banco de dados de controle estatístico de produção pesqueira marítima-ProPesq® (1999) Proceedings of the XI Congresso Brasileiro de Engenharia de Pesca, 2, pp. 824-832. , In, e I Congresso Latino Americano de Engenharia de Pesca. RecifeBeldazoli, A., Frosch, L., (1990) A pesca da manjuba, pp. 5-8. , BENDAZOLI, In, A. and ROSSI-WONGTSCHOWSKI, CLDB. (Eds). A manjuba no Rio Ribeira de Iguape: biologia, comportamento e avaliação do estoque. São Paulo: IBAMA, IOUSP, IP-SAA, SEMABonetti Filho, J., Miranda, L.B., Estimativa da Descarga de Água Doce no Sistema Estuarino-Lagunar Cananéia-Iguape (1997) Revista Brasileira de Oceanografia, 45 (2), pp. 89-94Callegari-Jacques, S.M., (2004) Bioestatística: Princípios e aplicações, p. 255. , Porto Alegre: ArtmedCamara, J.J.C., Cergole, M.C., Campos, E.C., Barbieri, G., Estrutura populacional, crescimento, mortalidade e taxa de exploração do estoque de manjuba Anchoviella lepidentostole (Pisces, Engraulidae) do rio Ribeira de Iguape, sudeste do Estado de São Paulo, Brasil, durante o período de 1993 a 1996 (2001) Boletim do Instituto de Pesca, 27 (2), pp. 219-230Day, J.W., Hall, C.A.S., Kemp, W.M., Yáñez-Arancibia, A., (1989) Estuarine ecology, p. 558. , New York: John Wiley & SonsDomínguez-Torreiro, M., Freijeiro-Álvarez, A.B., Iglesias-Malvido, C., Co-management proposals and their efficiency implizarions in fisheries management: The case of the Grand Sole fleet (2004) Marine Policy, 28, pp. 213-219Gatica, C., Hernandez, A., Tasas de captura estandarizadas como índice de abundancia relativa en pescarías: Enfoque por Modelos Lineares Generalizados (2003) Invest. Mar., Valparaíso, 31 (2), pp. 107-115Giamas, M.T.D., Santos, L.E., Vermulm, H., Influência de fatores climáticos sobre a reprodução da manjuba, Anchoviella lepidentostole (Fowler, 1911) (Teleostei, Engraulidae) (1983) Boletim do Instituto de Pesca, 10, pp. 95-100Giamas, M.T.D., Louro, M.P., Vermulm, H., (1990) Reprodução: Comprimento médio de primeira maturação, época e local de desova, pp. 23-24. , BENDAZOLI, In, A. and ROSSI-WONGTSCHOWSKI, CLDB. (Eds). A manjuba no Rio Ribeira de Iguape: biologia, comportamento e avaliação do estoque. São Paulo: IBAMA, IOUSP, IP-SAA, SEMAGunderson, L.H., Ecological resilience-in theory and application (2000) Annual Review of Ecology and Systematics, 31, pp. 425-439Hoffmann, E.E., Powell, T.M., Environmental variability effects on marine fisheries: Four case histories (1998) Ecological Applications, 8 (1), pp. S23-S32Holling, C.S., Resilience and stability of ecological systems (1973) Annual Review of Ecology and Systematics, 4, pp. 1-23Isaac-Nahum, V.J., Espírito Santo, R.V., Silva, B.B., Castro, E., Sena, A.L., Diagnóstico da pesca no litoral do Estado do Pará (2006) A pesca marinha e estuarina do Brasil no inicio do século XXI: Recursos, tecnologias, aspectos socioeconômicos e institucionais, pp. 11-40. , In ISAAC, VJ., MARTINS, AS., HAIMOVICI, M. and ANDRIGUETTO FILHO, J. (Eds.), Belém: Universidade Federal do Pará, UFPAJentoft, S., McCay, B., Wilson, D.C., Social theory and fisheries co-management (1998) Marine Policy, 22 (4-5), pp. 423-436Maciel, N., (2001) Composição, abundância e distribuição espaço-temporal da ictiofauna do complexo estuarinolagunar de Iguape-Cananéia-São Paulo-Brasil, , São Paulo: IO/USP. Tese de DoutoradoMachado, I.C., Mendonça, J.T., Gestão pesqueira participativa do Complexo Estuarino-lagunar de Cananéia, Iguape e Ilha Comprida e Área Costeira Adjacente (2007) Áreas aquáticas protegidas como instrumento de gestão pesqueira, pp. 79-98. , In PRATES, AP. and BLANC, D. (Eds.), Brasília: MMA/SBF. Série Áreas Protegidas do Brasil, no. 4Mendonça, J.T., Barbieri, E., Calasans, G.C., A pesca da manjuba (Anchoviella lepidentostole) e sua influência no complexo estuarino-lagunar de Cananéia-Iguape-Paranaguá (2000) In proceedings of the V Simpósio de Ecossistemas Brasileiros: Conservação e Dunas. Vitória, 1, pp. 251-260Mendonça, J.T., Miranda, L.V., Estatística pesqueira do litoral sul do estado de São Paulo: Subsídios para gestão compartilhada (2008) Pan-American Journal of Aquatic Sciences, 3 (3), pp. 152-173Mendonça, J.T., Bonfante, T.M., Assessment and management of fisheries of the white mullet Mugil curema (Valencienne, 1836) (Mugilidae) in the South Coast of Sao Paulo State, Brazil (2011) Brazilian journal of Biology, 71 (3), pp. 663-672Paiva-Sobrinho, R., Mendonça, J.T., Relação da vazão do Rio Ribeira com a produção da manjuba (Anchoviella lepidentostole) em Iguape-SP (2001) Proceedings of the XIV Semana Nacional de Oceanografia, p. 25. , In: Rio GrandePaiva-Sobrinho, R., Sistema de controle fuzzy aplicado à previsão da variação da salinidade no estuário de Cananéia e Ilha Comprida-SP (2001) Logic, artificial intelligence and robotics: Proceedings of the 2nd Congress of Logic Applied to Technology-LAPTEC's 2001, pp. 231-238. , In ABE, JM. and SILVA FILHO, JI. (Eds.), vol. II. São Paulo: Faculdade SENAC de Ciências Exatas e TecnologiaPaiva-Sobrinho, R., (2001) Variação da salinidade superficial no sistema estuarino lagunar Cananéia-Iguape-Ilha Comprida-SP: Influências da precipitação local e do Rio Ribeira, , Relatório Técnico N. 01/2001. Ilha Comprida: Departamento de Ecologia e Pesca, Prefeitura Municipal de Ilha CompridaPereira, H.S., (2004) Iniciativas de co-gestão dos recursos naturais da várzea, p. 132. , Estudo do Amazonas. Doc. Técnico 2. Manaus: IBAMAPró-VárzeaQuintas, J.S., (2002) Introdução a gestão ambiental pública, p. 132. , Brasília: IBAMARossi-Wongtschowski, C., (1990) Avaliação de estoque, , BENDAZOLI, In, A. and ROSSI-WONGTSCHOWSKI, CLDB. (Eds). A manjuba no Rio Ribeira de Iguape: biologia, comportamento e avaliação do estoque. São Paulo: IBAMA, IOUSP, IP-SAA, SEMARossi-Wongtschowski, C., Godinho, C., Cergole, M.C., (1990) Crescimento, , BENDAZOLI, In, A. and ROSSI-WONGTSCHOWSKI, CLDB. (Eds). A Manjuba no Rio Ribeira de Iguape: biologia, comportamento e avaliação do estoque. São Paulo: IBAMA, IOUSP, IP-SAA, SEMASchreiber, D., Co-management without involvement: The plight of fishing communities (2001) Fish and Fisheries, 2, pp. 376-384(1996) Regulamentação da APA Cananéia-Iguape-Peruíbe: Plano de gestão, p. 64. , Secretaria de Estado do Meio Ambiente de São Paulo-SMA, São Paulo: SMAIBAMASteele, J., Hoagland, P., Are fisheries "sustainable"? (2003) Fisheries Research, 64, pp. 1-

Casimir effect in a turbulent plasma

The analogy between the Casimir force acting on two parallel plates in vacuum and a similar force, which is of classical nature, acting on two parallel plates immersed in a turbulent plasma is explored. Like in the vacuum case, the force is attractive in a plasma, but its magnitude depends now on the energy level of the turbulent fluctuations as well as on the type of turbulence. The Casimir interaction between two nearby dust grains is also examined

Frequency Up-Conversion of an Intense Laser Beam Producing Gas Ionization in a Cavity

Frequency up-conversion of a laser beam causing gas ionization in a cavity is considered. A simple ionization model, based on one-photon and multi-photon processes is used. The WKB method is utilized to provide the slow evolution of the field amplitude. The analytical results thus obtained are presented and contrasted with the exact numerical results where all the time scales are present. The evolution of the wave frequency and its upshift predicted by the WKB method are in very good agreement with the numerical results. The same applies, though to a lesser degree, for the field energy loss as well

A quasi-particle approach to modulational instabilities in wave-plasma interactions

The interaction of broadband turbulence with monochromatic plasma waves has been studied. A kinetic equation for quasi-particles is used to describe the turbulence. Beam instabilities occur in this interaction when the group velocity of the short-wavelength wave packets, or quasi-particles, is nearly equal to the phase velocity of the long-wavelength monochromatic wave. Depending on the bandwidth of the turbulence, either a kinetic (resonant) instability, e. g. quasi-particle Landau damping, or a hydrodynamic instability, e. g. a modulational instability, will develop. This establishes a direct link between short- and long-wavelength perturbations of the medium. In this paper, the interaction between broadband drift mode turbulence and (nearly) monochromatic zonal flows has been studied numerically. Simulations have been conducted in which a particle-in-cell representation is used for the quasi-particles, while a fluid model is employed for the plasma. The interactions have been studied in both a tokamak-like configuration and a pseudo-shockwave configuration. Simulation results show the development of a zonal flow through the modulational instability of the drift wave distribution, as well as the existence of solitary zonal flow structures drifting towards steeper relative density gradients. The coupling between short- and long-wavelength modes found here is distinct from the usual picture of direct and inverse energy cascades, and it can be used as a new paradigm for the fluid and plasma turbulence theories

Thermal effects in drift-tearing modes

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Comportement des lignes de champ magnetique chaotiques dans un systeme periodique (Tokomak)

Report in French and EnglishSIGLEAvailable from British Library Document Supply Centre- DSC:4672.262(JET-P--89/14) / BLDSC - British Library Document Supply CentreGBUnited Kingdo

Photon acceleration of ultrashort laser pulses by relativistic ionization fronts

We present experimental results from the collision of weak ultrashort pulses with relativistic ionization fronts in copropagation and counterpropagation. The observed frequency upshifts of the probe pulses provide not only information about the electron density of the ionization front but also reveal the fine structure of the front. The connection between the correlation lengths for copropagation and counterpropagation and the longitudinal and transverse dimensions of the ionization front is also demonstrated thus showing the feasibility of using the frequency upshift experienced by short probe pulses to fully characterize relativistic ionization fronts and other relativistic coherent structures in laser-produced plasmas