3 research outputs found
Avaliação do isolamento sonoro aéreo de elementos de vedação na construção civil
This article presents a comparative analysis of sound insulation from airborne noise provided by conventional partition systems or industrialized panels used in construction. The analysis was based on an experiment on the sound insulation provided by the panels, and on a literature review, , aiming to obtain equations that could be use for different panel typologies.. These equations could be use to predict the sound insulation of single and double leaf panels, either with or without infill.Neste trabalho é apresentada uma análise do isolamento sonoro do ruído aéreo entre elementos de vedação utilizados na construção civil, sendo esses sistemas convencionais ou painéis industrializados. Esta análise é feita a partir de um estudo experimental do isolamento sonoro dos painéis e por um procedimento analítico, baseado em revisão bibliográfica, visando expressões que atendam às diferentes tipologias de painéis de vedação. O resultado é a possibilidade de utilização de algumas expressões para prever o isolamento sonoro de painéis de vedação maciços, duplos com camada de ar interna ou sanduíches
Neotropical freshwater fisheries : A dataset of occurrence and abundance of freshwater fishes in the Neotropics
The Neotropical region hosts 4225 freshwater fish species, ranking first among the world's most diverse regions for freshwater fishes. Our NEOTROPICAL FRESHWATER FISHES data set is the first to produce a large-scale Neotropical freshwater fish inventory, covering the entire Neotropical region from Mexico and the Caribbean in the north to the southern limits in Argentina, Paraguay, Chile, and Uruguay. We compiled 185,787 distribution records, with unique georeferenced coordinates, for the 4225 species, represented by occurrence and abundance data. The number of species for the most numerous orders are as follows: Characiformes (1289), Siluriformes (1384), Cichliformes (354), Cyprinodontiformes (245), and Gymnotiformes (135). The most recorded species was the characid Astyanax fasciatus (4696 records). We registered 116,802 distribution records for native species, compared to 1802 distribution records for nonnative species. The main aim of the NEOTROPICAL FRESHWATER FISHES data set was to make these occurrence and abundance data accessible for international researchers to develop ecological and macroecological studies, from local to regional scales, with focal fish species, families, or orders. We anticipate that the NEOTROPICAL FRESHWATER FISHES data set will be valuable for studies on a wide range of ecological processes, such as trophic cascades, fishery pressure, the effects of habitat loss and fragmentation, and the impacts of species invasion and climate change. There are no copyright restrictions on the data, and please cite this data paper when using the data in publications