Black scabbardfish (Aphanopus carbo Lowe, 1839) in the southern Northeast Atlantic: considerations on its fishery

Not available

Blended Wing Body (BWB) Boundary Layer Ingestion (BLI) Inlet Configuration and System Studies

A study was conducted to determine the potential reduction in fuel burned for BLI (boundary layer ingestion) inlets on a BWB (blended wing body) airplane employing AFC (active flow control). The BWB is a revolutionary type airplane configuration with engines on the aft upper surface where thick boundary layer offers the greatest opportunity for ram drag reduction. AFC is an emerging technology for boundary layer control. Several BLI inlet configurations were analyzed in the NASA-developed RANS Overflow CFD code. The study determined that, while large reductions in ram drag result from BLI, lower inlet pressure recovery produces engine performance penalties that largely offset this ram drag reduction. AFC could, however, enable a short BLI inlet that allows surface mounting of the engine which, when coupled with a short diffuser, would significantly reduce drag and weight for a potential 10% reduction in fuel burned. Continuing studies are therefore recommended to achieve this reduction in fuel burned considering the use of more modest amounts of BLI coupled with both AFC and PFC (Passive Flow Control) to produce a fail-operational system

A Motivação no trabalho: um estudo de caso

TCC (graduação) - Universidade Federal de Santa Catarina, Centro Sócio Econômico, Curso de Administração.Devido à competitividade existente no mercado, as organizações necessitam cada vez mais de colaboradores motivados para que os resultados organizacionais atinjam de maneira positiva seu negócio, ou seja, uma empresa sem funcionários motivados não sobrevive no mercado por muito tempo. A busca por novos benefícios e incentivos para motivar o colaborador exige das organizações uma elevada pesquisa, dedicação e um alto grau de interesse com os dados levantados. Para isso, fez-se uma pesquisa sobre motivação no trabalho envolvendo principalmente algumas variáveis como necessidades prioritárias, interesse, objetivos profissionais e pessoais, expectativas de cada indivíduo, para atingir os resultados organizacionais da empresa. O objetivo deste estudo é identificar o papel da motivação nos funcionários em relação aos resultados organizacionais da AR Manutenção e Montagem de Ar Condicionado. Para atingir o objetivo do estudo, foram realizadas pesquisas bibliográficas e pesquisa de campo, por meio de questionários, classificadas como exploratórias. A pesquisa exploratória foi realizada na empresa, no segundo semestre do ano de 2009, com uma amostra de 30 colaboradores. Observou-se pelos resultados que a motivação é um fator fundamental para o desempenho dos colaboradores da AR Manutenção e Montagem de Ar Condicionado, já que o colaborador motivado aumenta consideravelmente sua produção e busca alcançar os resultados propostos pela organização. Em contrapartida, a empresa apresenta falhas em alguns pontos relacionados a incentivos e benefícios, os quais, na maioria das vezes, não atendem o que o colaborador almeja, devido à falta de informações sobre as prioridades e as necessidades de cada indivíduo. De acordo com a pesquisa realizada, os colaboradores da AR Manutenção e Montagem de Ar Condicionado buscam primordialmente a qualidade de vida e o incentivo profissiona

Deducción de la fórmula de Herón a partir de las tangentes de los ángulos medios

En este trabajo presentamos una demostración de la fórmula de Herón, = √(( − )( − )( − )) para calcular el área de un triángulo con ángulos internos , y ; longitud de los lados , y , semiperimetro. El procedimiento está basado en los puntos determinados por la circunferencia inscrita, el cálculo de las tangentes de los ángulos medios del triángulo, el teorema de los cosenos y la identidad (/2) = √(1− ())/ √(1+ ()); así deducimos una nueva fórmula para el área del triangulo = ^2 (/2) (/2) (/2). Analizamos luego los casos particulares: = = , triángulos equiláteros = 92/4 ^3(/2); Si = , para triángulos isósceles = (2+/2)^2 * (^2(/2)/()) y = /2, triángulos rectángulos = ^2 (/2)(/4 − /2). Adicionalmente ilustramos esta demostración con una construcción en Geogebra, usando la ventana gráfica (fórmulas algebraicas) y la ventana grafica 2 (representación geométrica), que permite asociar los aspectos algebraicos a los geométricos mediante el uso de las casillas de control

Análisis de la forma del otolito como una herramienta para la segregación de stocks de sable negro, Aphanopus carbo Lowe, 1839, en aguas portuguesas

The variability in otolith contour shape of black scabbardfish (Aphanopus carbo) from Portuguese waters was analysed for stock discrimination purposes. The contour shape of otoliths from specimens caught off mainland Portugal, Madeira and Azores archipelagos was digitised and extracted according to the closed-form Fourier analysis technique. Mainland and Madeira specimens were compared through the adjustment of a MANOVA model to the normalised elliptic Fourier descriptor (NEFDs) obtained for the otoliths of 200 females and 200 males sampled at each area. Significant differences were found between areas and between sexes; the interaction term was not statistically significant. The effect of the area also proved to be significant when samples from the three regions were considered. These results were further supported by the discriminant analysis of the individual NEFDs for which the correct classifications were 87.5-89% when they were considered by sex and total length for the mainland and Madeira, and 90.9-97.7%, when NEFDs from the three areas were compared by sex and fish length. Otolith contour shape was shown to be a possible tool for differentiating between black scabbardfish stocks in the NE Atlantic.Se analizó la variabilidad de forma del contorno de otolitos del sable negro (Aphanopus carbo) procedentes de aguas Portuguesas como posible herramienta por la gestión de stocks. La imagen del contorno de otolitos de ejemplares capturados frente a la costa portuguesa, Archipiélago de Madeira y Archipiélago de Azores fue digitalizada y extraída conforme la técnica de análisis de Fourier para contornos cerrados. Como primer paso se compararon ejemplares de la costa portuguesa y de Madeira a través de un MANOVA sobre los descriptores elípticos de Fourier normalizados (NEFDs) estimados para los otolitos de 200 hembras y 200 machos de cada localidad. Se observaron diferencias significativas entre áreas y entre sexos, pero no hubo interacción entre los dos factores. El efecto del área también resultó ser significativo cuando se consideraron las muestras de las tres regiones. Estos resultados fueron corroborados por el análisis discriminante de los NEFDs para los cuales el porcentaje de clasificaciones correctas estuvo comprendido entre 87.5 y 89% cuando se compararon los NEFDs de la costa portuguesa y de Madeira por sexo, y considerando la talla del pez; y entre 90.9 y 97.7% cuando se consideraron las tres áreas por sexo y la talla total. Se demostró que la forma del contorno del otolito es una posible herramienta para diferenciar grupos de sable negro

Fecundity and sex steroid profile in boarfish Capros aper

The boarfish Capros aper is one of the most commonly discarded non-commercial species in the International Council for the Exploration of the Sea (ICES) Subdivision VIII in the Atlantic. An increasing interest in this fishery and an incomplete knowledge on the status of the stock justified the present investigation focused on the determination of fecundity type and its estimation, supported by sex steroid profiles for 17 beta-oestradiol (E2), 11-ketotestosterone and 17,20 beta-dihydroxypregn-4-en-3-one (17,20 beta-P). C. aper was found to have indeterminate fecundity with a mean relative batch fecundity during the spawning peak of 50 oocytes g(-1) eviscerated weight (W-E) and a mean relative annual fecundity of 4020 oocytes g(-1) W-E. E2 variations throughout the year indicated the existence of at least two important spawning events, one in winter (January-February) and the other in summer (June-August), with concentrations in females increasing from those with growing oocytes in the developing phase to those in the spawning capable phase. Higher E2 concentrations were also found from 2000 to 2400 hours and from 0800 to 1200 hours suggesting more intense vitellogenesis activity during the night and in the morning, in contrast to 17,20 beta-P concentrations, which were higher between 1200 and 2000 hours, suggesting a more intense spawning activity during this period.UID/MAR/04292/2019, UID/Multi/04326/2019, CEECIND/02705/2017, CEECIND/01528/2017, SFRH/BPD/108917/2015info:eu-repo/semantics/publishedVersio

Estrategias reproductivas en el sable negro (Aphanopus carbo Lowe, 1839) en el Atlántico nordeste

Gonads of the NE Atlantic black scabbardfish were examined to give an insight into the reproductive biology of this species. It was concluded that black scabbardfish had determinate fecundity because: (i) a distinct hiatus in oocyte size was observed between pre-vitellogenic and vitellogenic oocytes; (ii) vitellogenic oocytes increased in size during the spawning season; (iii) the number of vitellogenic oocytes did not increase during the spawning season; and (iv) the intensity of atresia was low in pre-spawning and spawning ovaries. Fecundity estimates ranged from 73 to 373 oocytes g-1 female. Comparison of developing ovaries from mainland Portugal and Madeira revealed that those from Madeira were more advanced in development, with more cortical alveoli stage oocytes and a higher gonadosomatic index. Starting in July, the reproductive development of all females from mainland Portugal was interrupted by a generalised atresia of developing oocytes. Completion of gametogenesis and spawning only occurred for fish from Madeira but some fish from this area also failed to complete oocyte development due to mass follicular atresia of vitellogenic oocytes. The percentage of Madeiran fish that failed to spawn due to follicular atresia ranged from 21.2% in 2006 to 37.4% in 2005.Las gónadas del sable negro del Atlántico nordeste fueron examinadas para conocer la biología reproductiva de esta especie. Los resultados sobre el tipo de fecundidad mostraron que la especie tenía una fecundidad determinada en base a los siguientes hechos: (i) hiato entre ovocitos previtelogénicos y vitelogénicos; (ii) aumento de tamaño de los ovocitos vitelogénicos durante el período de puesta; (iii) ausencia de incremento en el número permanente de ovocitos vitelogénicos avanzados durante el período de puesta y (iv) una pequeña atresia en los ovarios antes de la ovulación y durante ella. Las estimaciones de fecundidad se establecieron entre 73 y 373 ovocitos g-1 hembra. La comparación de los ovarios de hembras en desarrollo de aguas frente a Portugal continental y las de Madeira mostró una diferencia significativa en el tamaño medio de los ovocitos entre las dos áreas, y que las hembras de Madeira presentaron una mayor cantidad de ovocitos con alvéolos corticales y un índice gonadosomático mayor. A partir de julio y en hembras recolectadas frente a Portugal de continente, todos los individuos comenzaron a sufrir una atresia generalizada en sus ovocitos, mientras que en las aguas de Madeira, el ciclo reproductivo continúa hasta ovulación. Sin embargo, en algunas hembras de Madeira la gametogénesis también se paraliza y todos los ovocitos vitelogénicos son absorbidos vía atresia folicular. El porcentaje de hembras no reproductivas varió del 21.23% en 2006 al 37.4% en 2005

Highly regional population structure of Spondyliosoma cantharus depicted by nuclear and mitochondrial DNA data

Resolution of population structure represents an effective way to define biological stocks and inform efficient fisheries management. In the present study, the phylogeography of the protogynous sparid Spondyliosoma cantharus, in the East Atlantic and Mediterranean Sea, was investigated with nuclear (S7) and mitochondrial (cytochrome b) DNA markers. Significant divergence of four regional genetic groups was observed: North Eastern Atlantic, Mediterranean Sea, Western African Transition (Cape Verde) and Gulf of Guinea (Angola). The two southern populations (Cape Verde and Angola) each comprised reciprocally monophyletic mtDNA lineages, revealed low levels of diversity in Cape Verde and high diversity for Angola despite being represented by only 14 individuals. A complete divergence between North Atlantic and Mediterranean populations was depicted by the mitochondrial marker, but a highly shared nuclear haplotype revealed an incomplete lineage sorting between these regions. Bayesian skyline plots and associated statistics revealed different dynamics among the four regions. Cape Verde showed no expansion and the expansion time estimated for Angola was much older than for the other regions. Mediterranean region seems to have experienced an early population growth but has remained with a stable population size for the last 30000 years while the North Atlantic population has been steadily growing. The lack of genetic structuring within these regions should not be taken as evidence of demographic panmixia in light of potential resolution thresholds and previous evidence of intra-regional phenotypic heterogeneity.info:eu-repo/semantics/publishedVersio