Federal University of São Carlos

About: Federal University of São Carlos is a education organization based out in São Carlos, Brazil. It is known for research contribution in the topics: Population & Microstructure. The organization has 16471 authors who have published 34057 publications receiving 456654 citations. The organization is also known as: UFSCar & Federal University of São Carlos.

Processing and characterization of conductive composites based on poly(styrene-b-ethylene-ran-butylene-b-styrene) (SEBS) and carbon additives: A comparative study of expanded graphite and carbon black

Abstract: Electrically conductive polymer composites (ECPCs) based on poly(styrene-b-ethylene-ran-butylene-b-styrene) (SEBS) and expanded graphite (EG) or carbon black (CB) were prepared through melt blending using a torque rheometer equipped with a mixing chamber. Variations in parameters such as temperature, rotation speed and mixing time were investigated in order to define the most suitable processing conditions. The processing parameters investigated did not exert significant influence on the electrical conductivity for SEBS/EG composites, except for the mixture processed at 230 °C and 150 rpm for 15 min. On the other hand, it can be stated that the conductivity of the SEBS/CB depends on the processing temperature and mixing time. The electrical conductivity, morphology, dynamic mechanical, dielectric and rheological properties as well as electromagnetic interference shielding effectiveness (EMI-SE) of the SEBS/EG and SEBS/CB composites prepared under the same processing conditions were evaluated and compared. The insulator–conductor transition of SEBS/CB was very sharp and the electrical percolation threshold at room temperature was about 5 wt.% of CB, which was significantly lower than that of 9 wt.% for SEBS/EG composites. It was also observed that EMI SE value depends on its electrical conductivity. The EMI SE acceptable value for SEBS/CB composite with 15 wt.% of CB indicates that this materials are promising candidates for shielding applications.

ATLANTIC BIRD TRAITS: a data set of bird morphological traits from the Atlantic forests of South America

Abstract: Scientists have long been trying to understand why the Neotropical region holds the highest diversity of birds on Earth. Recently, there has been increased interest in morphological variation between and within species, and in how climate, topography, and anthropogenic pressures may explain and affect phenotypic variation. Because morphological data are not always available for many species at the local or regional scale, we are limited in our understanding of intra- and interspecies spatial morphological variation. Here, we present the ATLANTIC BIRD TRAITS, a data set that includes measurements of up to 44 morphological traits in 67,197 bird records from 2,790 populations distributed throughout the Atlantic forests of South America. This data set comprises information, compiled over two centuries (1820-2018), for 711 bird species, which represent 80% of all known bird diversity in the Atlantic Forest. Among the most commonly reported traits are sex (n = 65,717), age (n = 63,852), body mass (n = 58,768), flight molt presence (n = 44,941), molt presence (n = 44,847), body molt presence (n = 44,606), tail length (n = 43,005), reproductive stage (n = 42,588), bill length (n = 37,409), body length (n = 28,394), right wing length (n = 21,950), tarsus length (n = 20,342), and wing length (n = 18,071). The most frequently recorded species are Chiroxiphia caudata (n = 1,837), Turdus albicollis (n = 1,658), Trichothraupis melanops (n = 1,468), Turdus leucomelas (n = 1,436), and Basileuterus culicivorus (n = 1,384). The species recorded in the greatest number of sampling localities are Basileuterus culicivorus (n = 243), Trichothraupis melanops (n = 242), Chiroxiphia caudata (n = 210), Platyrinchus mystaceus (n = 208), and Turdus rufiventris (n = 191). ATLANTIC BIRD TRAITS (ABT) is the most comprehensive data set on measurements of bird morphological traits found in a biodiversity hotspot; it provides data for basic and applied research at multiple scales, from individual to community, and from the local to the macroecological perspectives. No copyright or proprietary restrictions are associated with the use of this data set. Please cite this data paper when the data are used in publications or teaching and educational activities.