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.

Acidity of Beta zeolite determined by TPD of ammonia and ethylbenzene disproportionation

Abstract: The acidity of Beta zeolites with Si/Al ratios ranging from 18 to 33 was determined using appropriate temperature programmed desorption of ammonia conditions and their catalytic behavior was evaluated by disproportionation of ethylbenzene. Samples with greater Si/Al ratios presented higher acid strength by retaining ammonia at higher temperatures and showed a higher ethylbenzene disproportionation activity per aluminum atom. These results indicate that as the aluminum content in zeolite Beta is reduced in that range, the strength of the associated acid sites increases.

A review of systematics, distribution and ecology of tropical freshwater zooplankton

Abstract: Studies on tropical freshwater zooplankton which commenced in the mid-19th century have been intensified during the past twenty years or so. The whole region, barring a few areas, has been investigated, including very recently tropical Australia. The widely scattered literature is briefly summarized with comments. Some general distributional patterns are emerging. There is a dearth of ecological studies especially on seasonality and production. Systematics lags behind the North Temperate zone in most tropical regions.

Comparison of linear and reverse linear periodization effects on maximal strength and body composition

Abstract: There are few studies that have compared different periodization methods for strength and hypertrophy. The aim of this study was to verify the effect of a 12-week strength training program with different periodization models on body composition and strength levels in women ranging from 20 to 35 years of age. Participants had a minimum of 6 months of experience in strength training, and they were divided into two groups: linear periodization (LP, n = 10) and reverse linear periodization (RLP, n = 10). Intensity was increased weekly; LP began with 12-14 maximal repetitions (RM), reaching loads of 4-6RM, and RLP began with 6-4RM and finished with 12-14RM. In all exercises, three sets were accomplished; number of repetitions and rest between sets and exercises were in accordance with weekly prescribed intensity. Training was performed 3 days per week. The evaluations were baseline evaluation (A1), after 4 weeks of training (A2), after 8 weeks (A3), after 12 weeks (A4), and after 1 week of detraining (A5). Fat mass and fat-free mass, maximum strength (bench press, lat pull-down, arm curl, and leg extension) were evaluated. There was an increase in fat-free mass and a decrease in fat mass in A4 compared with A1 only for the LP group. Both the LP and RLP groups presented significant gains in maximum strength levels in all exercises analyzed. However, for LP, the increases were greater when compared with RLP. In practical terms, LP is more effective for strength and hypertrophy as compared with RLP, and 1 week may be an adequate period for application of detraining without causing decreases in the performance of the parameters analyzed.