Academic literature on the topic 'Tapete de algas'
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Journal articles on the topic "Tapete de algas"
Gavio, Brigritte, and Adriana Santos-Martinez. "Floating Sargassum in Serranilla Bank, Caribbean Colombia, may jeopardize the race to the ocean of baby sea turtles." Acta Biológica Colombiana 23, no. 3 (September 1, 2018): 311–13. http://dx.doi.org/10.15446/abc.v23n3.68113.
Full textGómez Cubillos, Catalina, Brigitte Gavio, and Sven Zea. "Estructura de la comunidad de céspedes algales en interacciones con corales masivos en arrecifes del Parque Nacional Natural Tayrona, Caribe colombiano." Boletín de Investigaciones Marinas y Costeras 49, SuplEsp (December 14, 2020): 45–72. http://dx.doi.org/10.25268/bimc.invemar.2020.49.suplesp.1053.
Full textDUEÑAS-RAMÍREZ, PEDRO RICARDO, and JORGE ALEXANDER QUIROS-RODRIGUEZ. "Presencia de pseudonereis gallapagensis kinberg, 1865 (annelida: polychaeta: nereididae) en la costa caribe colombiana." Revista Colombiana de Ciencia Animal - RECIA 4, no. 2 (July 5, 2012): 454. http://dx.doi.org/10.24188/recia.v4.n2.2012.225.
Full textRodríguez-Ramírez, Alberto, María Catalina Reyes-Nivia, Sven Zea, Raúl Navas-Camacho, Jaime Garzón-Ferreira, Sonia Bejarano, Pilar Herrón, and Carlos Orozco. "Recent dynamics and condition of coral reefs in the Colombian Caribbean." Revista de Biología Tropical 58, no. 1 (July 3, 2015): 107. http://dx.doi.org/10.15517/rbt.v58i1.20027.
Full textChoi, Young Hwan, Ji Yong Lim, Kyu Heon Cho, Young Shil Kim, and Min Koo Han. "High Voltage AlGaN/GaN HEMTs Employing a Tapered Field Plate." Materials Science Forum 615-617 (March 2009): 971–74. http://dx.doi.org/10.4028/www.scientific.net/msf.615-617.971.
Full textCOLLÍ-MISSET, J., CONTRERAS E. FLORES, ORTIZ C. TOMASINI, and J. ROMERO. "OPTIMIZACION DE UNA LAGUNA DE MADURACIÓN UTILIZANDO MAMPARAJE Y TAPETES ALTERNADOS DE LEMNA GIBBA Y ALGAS." Proceedings of the Water Environment Federation 2001, no. 6 (January 1, 2001): 69–93. http://dx.doi.org/10.2175/193864701784291910.
Full textWalpole, J. N., E. S. Kintzer, S. R. Chinn, C. A. Wang, and L. J. Missaggia. "High‐power strained‐layer InGaAs/AlGaAs tapered traveling wave amplifier." Applied Physics Letters 61, no. 7 (August 17, 1992): 740–42. http://dx.doi.org/10.1063/1.107783.
Full textSaito, S., T. Kimura, T. Tanabe, K. Suto, Y. Oyama, and J. Nishizawa. "Fabrication and characteristics of GaP-AlGaP tapered waveguide semiconductor raman amplifiers." Journal of Lightwave Technology 21, no. 1 (January 2003): 170–75. http://dx.doi.org/10.1109/jlt.2003.808644.
Full textMurakami, T., K. Ohtaki, H. Matsubara, T. Yamawaki, H. Saito, K. Isshiki, Y. Kokubo, H. Kumabe, and W. Susaki. "High-power AlGaAs laser with a thin tapered-thickness active layer." Electronics Letters 22, no. 4 (1986): 217. http://dx.doi.org/10.1049/el:19860151.
Full textNaone, R. L., E. R. Hegblom, B. J. Thibeault, and L. A. Coldren. "Oxidation of AlGaAs layers for tapered apertures in vertical-cavity lasers." Electronics Letters 33, no. 4 (1997): 300. http://dx.doi.org/10.1049/el:19970222.
Full textDissertations / Theses on the topic "Tapete de algas"
NEVES, Júlia Rodrigues. "Resposta da meiofauna estuarina e da associação de Copepoda Harpacticoida à perturbação induzida pelo desenvolvimento de tapete de algas." Universidade Federal de Pernambuco, 2015. https://repositorio.ufpe.br/handle/123456789/17046.
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CNPQ
Em ecossistemas costeiros por todo mundo a incidência de tapetes de algas vem ocorrendo com efeitos prejudiciais sobre os ecossistemas estuarinos. Porém, além de existirem menos estudos avaliando seus efeitos sobre a meiofauna em relação aos da macrofauna, existem ainda respostas divergentes (benefício ou prejuízo na presença dos tapetes) nos diferentes estudos. Assim, o presente trabalho teve como objetivo avaliar os efeitos da presença de tapetes de algas sobre a meiofauna estuarina através de dois estudos: o primeiro com coletas realizadas em campo (tapete compacto de micro e macroalga) para comparar os efeitos do estágio de desenvolvimento de algas recém-formadas ou em decomposição (capítulo 1), e outro em experimento de laboratório (tapete de cianobactéria) observando os dias iniciais após o desenvolvimento do tapete (capítulo 2). As coletas ocorreram no complexo estuarino do Canal de Santa Cruz, localizado no litoral norte do estado de Pernambuco (Brasil), onde a ocorrência de tapetes de algas foi registrada anteriormente. As análises estatísticas envolveram o uso de ferramentas uni e multivariadas, como ANOVA, MDS e PERMANOVA, para analisar os efeitos dos tapetes de algas sobre os parâmetros ambientais, estrutura da comunidade de meiofauna e associação de harpacticoida. Nos dois estudos, a formação dos tapetes causou fortes alterações na estrutura da comunidade e nas densidades dos principais grupos da meiofauna e espécies do microcustáceo Copepoda Harpacticoida, reduzindo, de maneira geral, abundância, riqueza e diversidade nos tratamentos com tapete. Foram observadas ainda diferença entre os estágios fisiológicos dos tapetes, sendo o tapete recém-formado dominado pelo gênero de Copepoda Harpacticoida Cletocamptus que se beneficiou desse ambiente aumentando suas densidades, enquanto nos tapetes em decomposição todos os grupos e espécies foram reduzidos. Em laboratório, foram observadas condições hipóxicas em todos os dias experimentais nos tratamentos com tapete, com mudanças na estrutura e na densidade mais evidentes a partir do dia 4, sendo o dia 8 (final do experimento) o mais crítico. Considerando a importância da meiofauna nas relações tróficas dos ecossistemas estuarinos, o presente trabalho demonstra que estuários com formações de tapetes de algas estão sofrendo fortes perturbações ambientais.
Coastal ecosystems throughout the world have been submitted to increased incidence of algal mats with detrimental effects on estuarine ecosystems. However, there are few studies evaluating its effect on meiofauna, compared to macrofauna, and conflicting responses (increase or decrease) have been observed in different studies. Thus, the present study aims to evaluate the effects of the presence of algal mats on estuarine meiofauna: in a field observational experiment (compacted algal mats) comparing the effects of algae physiological stage, live or decomposing (chapter 1); and in a laboratory experiment (cyanobacteria) evaluating the initial days after the development of the mats (chapter 2). The study area comprised the estuary of Santa Cruz Channel, located on the northern coast of Pernambuco State (Brazil), where previous algal mats have been observed. Univariate and multivariate tests were performed (ANOVA, MDS and PERMANOVA) in order to examine the effects of algal mats on environmental variables, structure of the meiofauna community and harpacticoid assemblage. In both studies, mats caused strong changes in community structure and densities of the main meiofaunal groups and Harpacticoida species, reducing, in general, their abundance and diversity in treatments with mats. Differences were also observed between physiological stages, while live mats were dominated by Cletocamptus that benefited from this environment and increased its densities, in decomposing mats all groups and species had their densities reduced. In laboratory, hypoxic conditions were observed day by day in treatment with mats, and changes in structure and density were more apparent from day 4, day 8 (end of experiment) being the most critical. Considering the importance of meiofauna in the food web of estuarine ecosystems this study suggests drastic changes in estuarine environments that experience algal mats formation.
GOMES, JÚNIOR Edivaldo Lima. "Resposta da comunidade de tardígrados ao impacto do pisoteio associado ao turismo nos recifes de Porto de Galinhas (Ipojuca, PE)." Universidade Federal de Pernambuco, 2014. https://repositorio.ufpe.br/handle/123456789/16240.
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FACEPE
O pisoteio decorrente do tráfego de pedestres sobre os recifes de coral é um fenômeno associado ao turismo em muitas praias de Pernambuco. No ambiente fital o pisoteio pode afetar as algas e a fauna associada, modificando a estrutura das comunidades. O filo Tardigrada é componente permanente da meiofauna sendo encontrado no sedimento marinho e associado a macroalgas. O presente trabalho teve como objetivo avaliar o efeito do pisoteio sobre os tardígrados associados ao fital dos recifes de Porto de Galinhas, PE. Para isso delineou-se experimentos observacionais e manipulativos com intuito de avaliar o impacto do turismo e das simulações de pisoteio humano sobre a comunidade de Tardigrada. No primeiro experimento foram determinadas estações pareadas ao longo dos recifes, seguindo os limites entre a área protegida e a exposta ao trafego humano, avaliando se a comunidade diferia em consequência do pisoteio. Os tardígrados apresentaram abundâncias aparentemente condicionadas pelo tipo de substrato, mostrando reduções na densidade quando associados a Gelidiela acerosa, e exibindo maior densidade na área impactada quando associados Chodrophicus papillosus. Para o segundo experimento foram determinados transects na área protegida do recife e executados dois níveis de intensidade de pisoteio sobre o substrato recifal. A avaliação do efeito do pisoteio seguiu um desenho experimental BACI (Antes/Depois e Controle/Impacto), sendo as amostras coletadas para monitoramento do nível de recuperação da comunidade com um, dois e três meses após cessado o pisoteio. Como resultado deste trabalho, houve redução das variáveis do substrato algal (biomassa, cobertura, peso do substrato e altura do tapete) e também na densidade de Tardigrada, com valores seguindo uma tendência de redução tanto maior o nível de estresse. Variações locais, foram determinantes para a estrutura da comunidade de Tardigrada, dificultando a compreensão dos efeitos do impacto. O processo de recuperação foi independente da intensidade do distúrbio, alcançando valores estabilizados já no primeiro mês.
The trampling resulting from pedestrian traffic on coral reefs is a phenomenon associated with tourism in many beaches of Pernambuco. In phytal environment the trampling can affect the algae and associated fauna, modifying the structure of communities. The phylum Tardigrada is permanent component of the meiofauna being found in marine sediment and associated with macroalgae. This study aimed to evaluate the effect of trampling on tardigrades associated with the phytal of reefs of Porto de Galinhas, PE. For this were outlined observational and manipulative experiments in order to assess the impact of tourism and simulations of human trampling on the community of tardigrades. In the first experiment were paired certain stations along the reefs, following the boundaries of the protected area and exposed to human traffic, assessing whether the community differed as a result of trampling. The tardigrades presented abundances apparently conditioned by the type of substrate, showing reductions in density when associated with a Gelidiela acerosa, and exhibiting higher density in the impacted area when associated Chodrophicus papillosus. For the second experiment were determined transects in protected reef area and run two levels of intensity of trampling on reef substrate. The evaluation of the effect of trampling followed a experimental design BACI (Before / After and Control / Impact), being the samples collected for monitoring of the level of recovery of the community with one, two and three months after trampling ceased. As a result of this work, there was a reduction of the algal substrate variables (biomass, cover, substrate weight and turf height) and also the density of tardigrades, with values following a trend of greater reduction in both the level of stress. Local variations were crucial to the structure of the tardigrades community, making the understanding of the effects of the impact difficult. The recovery process was independent of the intensity of the disturbance, reaching values stabilized in the first month.
Black, Edward Adam. "Differentiation of morphology and toxicity in harmful algal blooms caused by the raphidophyte alga Heterosigma akashiwo." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape2/PQDD_0019/NQ52753.pdf.
Full textVALENÇA, Ana Paula Maria Cavalcanti. "Resposta da macrofauna bêntica estuarina ao estresse induzido por tapetes de alga." Universidade Federal de Pernambuco, 2015. https://repositorio.ufpe.br/handle/123456789/17376.
Full textMade available in DSpace on 2016-07-14T14:41:09Z (GMT). No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Tese_Ana Paula MC Valença.pdf: 2664032 bytes, checksum: 5b5c31bf5f29946a540d84d29e519535 (MD5) Previous issue date: 2015-02-23
FACEPE
A presente tese avaliou os possíveis impactos gerados pelos tapetes de alga na macrofauna estuarina. Em uma planície estuarina lamosa, situada no Complexo Estuarino do Canal de Santa Cruz, litoral norte de Pernambuco, foi registrada a ocorrência de tapetes de algas filamentosas em diferentes períodos (Setembro-2012, Setembro a Dezembro-2013 e Maio a Junho-2014). Através de estudos observacionais e manipulativos in situ foram testados: (I) o efeito do tapete algal na biogeoquímica sedimentar e na fauna, considerando a presença da alga e o seu estágio fisiológico; (II) a recolonização e a recuperação da macrofauna em sedimentos com remoção algal considerando os efeitos da compactação sedimentar gerada pelo tapete e do tamanho da área algal removida; a existência de efeitos (III) de barreira e (IV) de sazonalidade gerados pelo tapete algal e analisados sob a ótica da recolonização inicial. O estágio fisiológico da alga foi importante para a biogeoquímica sedimentar, enquanto que a presença do tapete algal se caracterizou como uma importante fonte de distúrbio para a fauna bêntica. A recolonização pela macrofauna nos sedimentos com remoção algal ocorreu de forma discreta e dependente da compactação sedimentar e do tamanho da área removida apenas para os parâmetros univariados. Além disso, não foi observada a recuperação das áreas experimentais até ao final do estudo (95 dias). A recolonização inicial (30 dias) não foi afetada pela presença do tapete algal circunvizinho às áreas experimentais. Embora tenha sido observado que a sazonalidade influencia no sedimento e na fauna, a análise da comunidade indicou uma tendência à convergência entre os tratamentos de remoção (AR) e sedimento natural (NA) independente da mesma. Além disso, foi observada uma relação entre o regime pluviométrico e o desenvolvimento do tapete algal. As consequências ecológicas do tapete algal, analisadas sob a recolonização a curto (30 dias) e médio prazo (95 dias), mostraram ser pouco previsíveis e extremamente influenciadas pela heterogeneidade ambiental. Além disso, a recuperação da comunidade em uma área afetada pelo desenvolvimento de tapete algal pode não apresentar a sequência sucessional observada em outros experimentos de colonização. Embora os estudos tenham sido conduzidos em um único local (na mesma planície estuarina), os resultados permitem uma melhor compreensão dos efeitos dos tapetes de algas na macrofauna bêntica estuarina.
This thesis assessed the possible impacts of algal mats on estuarine macrofauna. In an estuarine mudflat placed on Santa Cruz Channel Estuarine Complex, in the north coast of Pernambuco, the occurrence of filamentous mat-forming algae was registered at different periods (September-2012, September to December-2013 and May to June-2014). Observational and manipulative studies were conducted in situ and tested: (I) the effect of algal mats on sediment biogeochemistry and fauna, considering the presence of the algae and the physiological stage; (II) the recolonization and recovery of macrofauna in algal removal sediments relating to sediment compaction and the extension of algal removed (i.e. spatial scale); the existence of (III) boundaries and (IV) seasonal effects generated by the algal mat and analyzed using macrofauna recolonization data. The physiological stage affected significantly the sediment biogeochemistry and the presence of the algae was an important source of disturbance to benthic fauna. The recolonization of algal removal sediments varied regarding sediment compaction and spatial scale, but this was discrete and restricted to univariate measures. Besides, no recovery of any removal treatment was observed at the end of the experiment (95 days). Initial recolonization (30 days) was not affected by the surrounding algal mat found in the algal removal treatments. Although seasonal effects influence on sediment and fauna data, the analysis of benthic community showed a tendency of convergence between NA and AR treatments regardless of season. Moreover, it was possible to observe a relationship between rainfall seasonality and algal mat development. Ecological consequences of algal mats, analyzed through faunal recolonization within short- (30 days) and medium- (95 days) terms, showed to be less predictable and strongly influenced by environmental heterogeneity. Besides, community recovery in an area affected by algal coverage does not always include the successional sequence observed in other colonization experiments. Although the series of experiments have been conducted under one location (the same estuarine mudflat), the results provided strong insights on the effects of algal mats on tropical benthic macrofauna.
Richard, Gaëlle. "Approche mécanistique de la réponse de la palourde japonaise, Ruditapes philippinarum, exposée à la bactérie Vibrio tapetis : influence de la température et du régime algal." Thesis, Brest, 2015. http://www.theses.fr/2015BRES0103/document.
Full textThe Manila clam, Ruditapes philippinarum, was introduced in France in 1972 following the willingness of bivalve aquaculture diversification. In the late 1980s, episodic mass mortality events were observed in ponds of the “Pays des Abers” region (Finistère, France). The massive mortality of clams was associated brown ring disease (BRD), a vibriosis which causative agent is Vibrio tapetis. BRD development in field has been associated with the modulation of environmental factors such as temperature or the presence of trophic resource. Firstly in the frame of the present work, experimental infections of clams with different strains of V. tapetis were performed together with animal acclimation at two contrasted temperatures. The increase of temperature from 15 to 22 ° C was associated with higher enzymatic activities of superoxide dismutase (SOD), involved in the antioxidant system, and the phenoloxidase (PO), involved in the innate immune system. Temperature increase also led to a decrease in virulence of V. tapetis. Together, these results might explain the decline in BRD prevalence and intensity observed at 22 ° C. Secondly, sexually mature clams fed with two microalgal diets contrasted in terms of lipid composition were infected with V. tapetis. Although microalgae quality did not lead to any difference in BRD prevalence and intensity, the reproductive status of clams influenced BRD intensity. Metabolic responses of R. philippinarum exposed to V. tapetis were not influenced by the food quality but mainly by BRD development. These responses consisted in a modulation of the activity of antioxidant enzymes (SOD, catalase, glutathione peroxidase, glutathione reductase, glutathione S-transferase) and enzymes related to innate immune system (PO and inducible nitric oxide synthase) according to the presence of BRD clinical signs. Finally, the use of these biochemical indicators could allow for new criteria for selection of BRD resistant clams
Bicca, Aline Brugalli. "A família Eunotiaceae Kutzing (Eunotiales, Bacillariophyta) nas áreas da Lagoa do Casamento e dos Butiazais de Tapes, plnície costeira do RS : taxonomia e distribuíção." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2007. http://hdl.handle.net/10183/12223.
Full textThe present study aimed to taxonomically analyze the family Eunotiaceae and investigate the distribution of the species in Lake Casamento and Butiazais de Tapes, in the Coastal Plains of Rio Grande do Sul. The study was based on samples from 21 georeferred stations, covering different environments (isolated lakes, interconnected lakes, swamps, ponds, and canals), in pelagic zones and shoreline. The samples were taken in the fall (May and June 2003) and spring (October to December 2003). As a result, the family was represented by 42 species (where nine are still not identified) and five varieties pertaining to the genus Eunotia and one to the species Actinella. Eunotia bilunaris, E. schwabei, E. tridentula var. tridentula, E. vumbae, E. yberai, and E. zygodon are cited for the first time in the Coastal Region; while E. batavica, E. genuflexa, E. herzogii, E. pileus, E. pirla, E. subarcuatoides, E. deficiens, E. hepaticola, E. mucophila, E. pseudosudetica, E. transfuga and E. yanomami are reported for the first time in Rio Grande do Sul. 2% of the species were considered constant, 14,8% frequent, 34% common, and 48,9% rare, where within the constant, E. flexuosa were highly representative in Lake Casamento, being found in 100% of the sampled areas. In both areas, the species richness was high, where 34 species were found in Lake Casamento and 36 in Butiazais de Tapes. The swamp between Lake Capivari and Lake Casamento and the swamp with Sphagnum were the environments that presented the highest richness, with 25 and 19 species, respectively, by presenting favorable conditions for the development of organisms from this family, which are acidic waters and abundant aquatic vegetation.
Ramanujachar, Kartik. "Diffusion studies in InGaAs/GaAs and AlGaAs/GaAs quantum well structures." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0007/NQ42871.pdf.
Full textEdirisinghe, Champika H. "Passivation studies of AlGaAs materials for high power laser diode development." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0028/MQ51611.pdf.
Full textCollins, Christopher Martin. "Iron acquisition by the green alga Selenastrum minutum." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape2/PQDD_0015/MQ54699.pdf.
Full textBozzo, Gale Giancarlo. "Induction and regulation of dissolved inorganic carbon transport in green algae." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape2/PQDD_0016/MQ56165.pdf.
Full textConference papers on the topic "Tapete de algas"
Melanson, Bryan, Cheng Liu, Matthew Hartensveld, and Jing Zhang. "Light extraction analysis of AlGaN nanowires with inverse taper for DUV LEDs." In Light-Emitting Devices, Materials, and Applications XXV, edited by Martin Strassburg, Jong Kyu Kim, and Michael R. Krames. SPIE, 2021. http://dx.doi.org/10.1117/12.2583116.
Full textXie, Suning, S. Sinha, and Ramu V. Ramaswamy. "Integration of GaAs/AlGaAs SQW laser and MQW modulator via a tapered waveguide interconnect without regrowth." In Photonics West '97, edited by Yoon-Soo Park and Ramu V. Ramaswamy. SPIE, 1997. http://dx.doi.org/10.1117/12.264220.
Full textMesaritakis, C., A. Kapsalis, C. Simos, H. Simos, M. Krakowski, and D. Syvridis. "Optimized InAs/AlGaAs Quantum Dot semiconductor optical amplifier tapered geometry for enhanced beam quality and optical gain." In 2013 Conference on Lasers & Electro-Optics Europe & International Quantum Electronics Conference CLEO EUROPE/IQEC. IEEE, 2013. http://dx.doi.org/10.1109/cleoe-iqec.2013.6800703.
Full textKlopp, Peter, Uwe Griebner, Martin Zorn, Andreas Klehr, Armin Liero, Götz Erbert, and Markus Weyers. "InGaAs-AlGaAs Disk Laser Generating sub-220-fs Pulses and Tapered Diode Amplifier with Ultrafast Pulse Picking." In Advanced Solid-State Photonics. Washington, D.C.: OSA, 2009. http://dx.doi.org/10.1364/assp.2009.me3.
Full textJi, In-Hwan, Bongmook Lee, Sizhen Wang, Veena Misra, Alex Q. Huang, and Young-Hwan Choi. "High voltage AlGaN/GaN HFET employing low taper angle field-plate for stable forward blocking capability." In 2014 IEEE 26th International Symposium on Power Semiconductor Devices & IC's (ISPSD). IEEE, 2014. http://dx.doi.org/10.1109/ispsd.2014.6856028.
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