Piecewise Aggregate Approximation and Quantile Regression for Wind Speed Analysis

© 2017 IEEE. The high cost of energy production, coupled with the advantages of wind power as renewable and widely available source of energy, has led several countries to establish incentives to regulate and promote wind power generation. This work proposes the implementation and comparison of two time series analysis methods: Piecewise Aggregate Approximation (PAA) and a PAA plus quantile regression process. The aim is to estimate the minimum amount of extreme cut-in and cut-out events of the wind speed in the power generation process. Brazil has an enormous wind power potential. The diversification of its energy matrix is becoming a necessary challenge nowadays in the commitment of using renewable energy sources. The performance of the two PAA based proposals is tested for to the wind farms of the south and northeast regions. These locations belong to Brazil's regions of different geographic and wind characteristics. This endows to also check the proposals robustness under divergent scenarios. The results indicate that the PAA/QR method performed better than the PAA method because it identified a greater amount of extreme values

NFAT Isoforms Regulate Muscle Fiber Type Transition without Altering CaN during Aerobic Training

The purpose of this study was to determine whether the aerobic training-induced fiber-type transition in different muscles is associated with alterations in NFAT isoforms gene expression. We hypothesized that the aerobic training-induced fiber-type transition would be mediated by NFATc1-c3 isoforms without altering the CaN expression. Male Wistar rats (80 days old) were divided into a trained group (T; n=8) that underwent an 8-wk swimming endurance training program (5 days/week) and a control group (C; n=8). After the experimental period, the animals were sacrificed, and the soleus (SOL) and plantaris (PL) muscles were collected for morphometrical, histochemical and molecular analyses. Aerobic training induced a type I-to-type IIA fiber transition in the SOL muscle and a type IIB-to-type IIA fiber transition in the PL muscle, which were concomitant with a significant (p<0.05) increase in NFATc1-c3 gene expression in both the SOL and PL muscles. In contrast, the expression levels of calcineurin (CaN) and NFATc4 remained unchanged. Therefore, our results showed that fiber type switching induced by aerobic training is mediated by NFATc1-c3 isoforms without altering the CaN expression.341086186