Primeira ocorrência de Pachycheles riisei (Crustacea, Porcellanidae) no Atol das Rocas Brasil

The present work redescribes Pachycheles riisei based on material from intertidal lagoons at Rocas Atoll, Brazil. This is the first record of P. riisei for Rocas Atoll, species previously found from Florida, Caribbean Sea, and Brazil (Paraíba to São Paulo, Fernando de Noronha and Trindade Isl.).O presente estudo redescreve Pachycheles riisei com base no material coletado em poças de maré no Atol das Rocas, Brasil. Este é o primeiro registro de P. riisei para o Atol das Rocas, espécies anteriormente encontrada na Florida, Mar do Caribe e Brazil (Paraíba to São Paulo, Fernando de Noronha and Trindade Island)

Power converter topologies for wind energy conversion systems: Integrated modeling, control strategy and performance simulation

This paper presents new integrated model for variable-speed wind energy conversion systems, considering a more accurate dynamic of the wind turbine, rotor, generator, power converter and filter. Pulse width modulation by space vector modulation associated with sliding mode is used for controlling the power converters. Also, power factor control is introduced at the output of the power converters. Comprehensive performance simulation studies are carried out with matrix, two-level and multilevel power converter topologies in order to adequately assert the system performance. Conclusions are duly drawn

A Pitch Control Malfunction Analysis for Wind Turbines with Permanent Magnet Synchronous Generator and Full-power Converters: Proportional Integral Versus Fractional-order Controllers

A transient analysis for two full-power converter wind turbines equipped with a permanent magnet synchronous generator is studied in this article, taking into consideration, as a new contribution to earlier studies, a pitch control malfunction. The two full-power converters considered are, respectively, a two-level and a multi-level converter. Moreover, a novel control strategy based on fractional-order controllers for wind turbines is studied. Simulation results are presented; conclusions are in favor of the novel control strategy, improving the quality of the energy injected into the electric grid

Comparative study of power converter topologies and control strategies for the harmonic performance of variable-speed wind turbine generator systems

Power converters play a vital role in the integration of wind power into the electrical grid. Variable-speed wind turbine generator systems have a considerable interest of application for grid connection at constant frequency. In this paper, comprehensive simulation studies are carried out with three power converter topologies: matrix, two-level and multilevel. A fractional-order control strategy is studied for the variable-speed operation of wind turbine generator systems. The studies are in order to compare power converter topologies and control strategies. The studies reveal that the multilevel converter and the proposed fractional-order control strategy enable an improvement in the power quality, in comparison with the other power converters using a classical integer-order control strategy. (C) 2010 Elsevier Ltd. All rights reserved

Modeling, control and simulation of full-power converter wind turbines equipped with permanent magnet synchronous generator

In this paper, two wind turbines equipped with a permanent magnet synchronous generator (PMSG) and respectively with a two-level or a multilevel converter are simulated in order to access the malfunction transient performance. Three different drive train mass models, respectively, one, two and three mass models, are considered in order to model the bending flexibility of the blades. Moreover, a fractional-order control strategy is studied comparatively to a classical integer-order control strategy. Computer simulations are carried out, and conclusions about the total harmonic distortion (THD) of the electric current injected into the electric grid are in favor of the fractional-order control strategy

A new species of Neotropical freshwater stingray of the genus Potamotrygon Garman, 1877 from the Río Madrede Díos, Peru (Chondrichthyes: Potamotrygonidae)

Potamotrygon tatianae sp. nov., is described from Río Madre de Díos, Peru, upper Rio Madeira basin. The new species is distinguished from all congeners by a unique combination of characters, including its dorsal color pattern formed by a relatively slender, highly convoluted, beige to dark brown vermicular pattern, a single row of dorsal tail spines, and a relatively longer tail posterior to caudal stings. Potamotrygon tatianae sp. nov., occurs sympatrically with other species of Potamotrygon (P. falkneri, P. orbignyi and P. motoro). From the similar species P. falkneri, P. tatianae sp. nov., is further distinguished by the absence of circular, reniform, and oval spots, by its proportionally much longer tail, by having dorsal tail spines in one irregular row, and by features of the ventral lateral-line canal, dermal denticles and neurocranium. From P. orbignyi, the new species is distinct by lacking a reticulate pattern on dorsal disc and by the presence of two angular cartilages. From P. motoro, P. tatianae sp. nov., is further separated by the lack of ocelli formed by strong black concentric rings, by the more flattened aspect of its head and disc, and by having smaller and more numerous teeth. The discovery of a new species that so closely resembles a congeneric form in color pattern, a feature highly variable within the latter, highlights the importance of examining large series of individuals and of detailed morphological analyses in revealing the potentially highly cryptic nature of the diversity within the family.Potamotrygon tatianae sp. nov., é descrita do Río Madre de Díos, Peru, alto da bacia do Río Madeira. Essa nova espécie é distinta de todas as espécies congenéricas por uma combinação única de caracteres, incluindo sua coloração dorsal formada por um padrão vermicular de cor bege a marrom escuro, relativamente delgado e altamente convoluto, uma única fileira mediana dorsal de espinhos sobre a cauda e uma cauda relativamente longa posteriormente aos ferrões caudais. Potamotrygon tatianae sp. nov., ocorre em simpatria com outras espécies de Potamotrygon (P. falkneri, P. orbignyi and P. motoro). Da espécie similar P. falkneri, P.tatianae sp. nov., é também distinguida pela ausência de manchas circulares, reniformes e ovais, por sua cauda proporcionalmente mais longa, por apresentar espinhos caudais em uma única fileira irregular e por caracteres dos canais ventrais da linha lateral, dentículos dérmicos e neurocrânio. De P. orbignyi, a nova espécie é distinguida pela ausência de um padrão reticulado no dorso do disco e pela presença de duas cartilagens angulares. De P. motoro, P. tatianae sp. nov., é separada pela ausência de ocelos formados por anéis negros concêntricos intensos, pelo aspecto mais achatado da cabeça e disco e pela presença de dentes menores e mais numerosos. A descoberta de uma espécie nova que é semelhante a uma outra espécie congenérica que possui um padrão de colorido dorsal semelhante, um caráter muito variável nesta espécie, ressalta a importância de examinar séries grandes de indivíduos e de análises morfológicas detalhadas para revelar a natureza potencialmente críptica da diversidade dentro da família

Transient analysis of variable-speed wind turbines at wind speed disturbances and a pitch control malfunction

As wind power generation undergoes rapid growth, new technical challenges emerge: dynamic stability and power quality. The influence of wind speed disturbances and a pitch control malfunction on the quality of the energy injected into the electric grid is studied for variable-speed wind turbines with different power-electronic converter topologies. Additionally, a new control strategy is proposed for the variable-speed operation of wind turbines with permanent magnet synchronous generators. The performance of disturbance attenuation and system robustness is ascertained. Simulation results are presented and conclusions are duly drawn. (C) 2010 Elsevier Ltd. All rights reserved

Fractional-order control and simulation of wind energy systems with PMSG/full-power converter topology

This paper presents a new integrated model for the simulation of wind energy systems. The proposed model is more realistic and accurate, considering a variable-speed wind turbine, two-mass rotor, permanent magnet synchronous generator (PMSG), different power converter topologies, and filters. Additionally, a new control strategy is proposed for the variable-speed operation of wind turbines with PMSG/full-power converter topology, based on fractional-order controllers. Comprehensive simulation studies are carried out with matrix and multilevel power converter topologies, in order to adequately assert the system performance in what regards the quality of the energy injected into the electric grid. Finally, conclusions are duly drawn

Bifurcations of the Riccati quadratic polynomial differential systems

In this paper, we characterize the global phase portrait of the Riccati quadratic polynomial differential system ẋ = α2(x), ẏ = ky2 + β1(x)y + γ2(x), with (x,y)∈R2, γ2(x) nonzero (otherwise the system is a Bernoulli differential system), k ≠ 0 (otherwise the system is a Liénard differential system), β1(x) a polynomial of degree at most 1, α2(x) and γ2(x) polynomials of degree at most 2, and the maximum of the degrees of α2(x) and ky2 + β1(x)y + γ2(x) is 2. We give the complete description of the phase portraits in the Poincaré disk (i.e. in the compactification of R2 adding the circle S1 of the infinity) modulo topological equivalence

Denture-related oral mucosal lesions among farmers in a semi-arid Northeastern region of Brazil

Objectives: The purpose of this study was to evaluate the prevalence of denture-related oral mucosal lesions (DML) in São Francisco sertão microregion, in Sergipe State, Northeastern Brazil. Study Design: Data related to gender, age, type of denture, length of denture use, hygiene care, nocturnal denture wear, symptoms, and presence of DML were obtained. Statistical analysis included the Pearson's chi-square and multivariate logistic regression. Results: The global prevalence of DML was 50%, with a significant association between the DML and female gender, age ? 40 years, and length of use ? 5 years. By using the interaction model of logistic regression it was observed that females over 40 years have 4.5 greater odds of developing DML compared to males of the same age group. The DML more common was the type 2 denture stomatitis, followed by type 1 denture stomatitis and inflammatory fibrous hyperplasia. Conclusions: This study shows that the DML are more common in female over 40 years of age, suggesting that hormonal chances and age-related factors may favor the development of lesions. In addition, there is a significant association between length of denture use and prevalence of DML. © Medicina Oral S. L