Validation of accelerometer data for measuring impacts during jumping and landing tasks

The purpose of this study was to examine the validity of a commercially-available accelerometer, as used in the field team sports context. Ten adult participants completed two movement tasks: 1) a drop landing task from 30-cm, 40-cm and 50-cm heights [DLAND], and 2) a countermovement jumping task [CMJ]. Peak acceleration values, both smoothed and unsmoothed, occurring in the longitudinal axis [Y] and calculated to produce vector magnitude values [VM], were compared to peak vertical ground reaction force values [VGRF]. All acceleration measures were moderately correlated (r = 0.45 &ndash; 0.70), but also significantly higher than weight-adjusted VGRF, for both tasks. Though the raw acceleration measures were mostly above the acceptable limit for error (&gt; 20%), the smoothed data had reduced error margins by comparison, most of which were well below 20%. These results provide some support for the continued use of accelerometer data, particularly when smoothed, to accurately quantify impacts in the field.<br /

VALIDATION OF ACCELEROMETER DATA FOR MEASURING IMPACTS DURING JUMPING AND LANDING TASKS

The purpose of this study was to examine the validity of a commercially-available accelerometer, as used in the field team sports context. Ten adult participants completed two movement tasks: 1) a drop landing task from 30-cm, 40-cm and 50-cm heights [DLAND], and 2) a countermovement jumping task [CMJ]. Peak acceleration values, both smoothed and unsmoothed, occurring in the longitudinal axis [Y] and calculated to produce vector magnitude values [VM], were compared to peak vertical ground reaction force values [VGRF]. All acceleration measures were moderately correlated (r = 0.45 – 0.70), but also significantly higher than weight-adjusted VGRF, for both tasks. Though the raw acceleration measures were mostly above the acceptable limit for error (> 20%), the smoothed data had reduced error margins by comparison, most of which were well below 20%. These results provide some support for the continued use of accelerometer data, particularly when smoothed, to accurately quantify impacts in the field

Estrutura do sub-bosque em manchas florestais no Pantanal da Nhecolândia: efeitos da presença de gado.

bitstream/CPAP-2009-09/56932/1/COT74.pd

Ocupação de manchas florestais por espécies de pica-paus e arapaçus no Pantanal.

Neste estudo avaliamos a influência de algumas variáveis de paisagem e habitat nas probabildades de ocupação de manchas florestais naturais por seis espécies deste tipo de aves no Pantanal da Nhecolândia. O estudo foi realizado em 2008 na fazenda Nhumirim e arredores, nas estações chuvosa e seca

Evaluation of food lures for capture and monitoring of anastrepha fraterculus (Diptera: Tephritidae) on temperate fruit trees.

The Anastrepha fraterculus (Wiedemann) (Diptera: Tephritidae) is the main pest of fruit trees grown in temperate climates in the southern region of Brazil. The objective of this work was to evaluate the efficiency of the major commercial food lures used in Brazil for trapping and monitoring of A. fraterculus in plum, pear, and feijoa orchards. The assessed lures were hydrolyzed proteins of animal origin (CeraTrap) and plant origin (BioAnastrepha), torula yeast þ borax (Torula), and grape juice. Response variables included the rate of adult capture (flies per trap per day, FTD) and the percentage of females captured. We also evaluated the number of times the weekly capture rate exceeded the traditional threshold of 0.5 FTD for each lure. Traps baited with grape juice, currently used for monitoring A . fraterculus in Southern Brazil, captured fewer adults and a lower percentage of females compared with the other lures. CeraTrap trapped a greater number of A . fraterculus adults and, in some cases, a lower percentage of females compared with the other lures in pears. Traps baited with CeraTrap had greater capture rates (FTD), particularly during the stages of fruit maturation and harvest, and even in years with low population density of A. fraterculus , thus demonstrating greater sensitivity in the detection of this pest. These results show that, in order to detect and monitor the presence of A . fraterculus in plum, feijoa, and pear crops, protein-based lures are superior to grape juice, especially the animal protein CeraTrap

Matching fields of a long superconducting film

We obtain the vortex configurations, the matching fields and the magnetization of a superconducting film with a finite cross section. The applied magnetic field is normal to this cross section, and we use London theory to calculate many of its properties, such as the local magnetic field, the free energy and the induction for the mixed state. Thus previous similar theoretical works, done for an infinitely long superconducting film, are recovered here, in the special limit of a very long cross section.Comment: Contains a REVTeX file and 4 figure

O futuro do cooperativismo de leite.

bitstream/item/132478/1/Livro-O-futuro-do-cooperativismo.pd

Ocupação de manchas florestais por jaó (Crypturellus undulatus) no oeste do Pantanal da Nhecolândia, Corumbá, MS.

ABSTRACT: Forest patch occupancy by Undulated Tinamou (Crypturellus undulatus) in west of Pantanal da Nhecolândia, Corumbá, MS. The deforestation process and changes in the structure of forest habitats in Pantanal have caused decline in the biological diversity. The goal of this study was to evaluate the influence of landscape and forest patches structure on the occupancy probabilities of Undulated Tinamou Crypturellus undulatus (Temminck, 1815) in the western ?Pantanal da Nhecolândia?, Mato Grosso do Sul, Brazil. From January to October 2008 we sampled 40 sites in forest patches in four areas of different ecological and management conditions. In each point we obtained landscape (area and distance between forest patches) and habitat variables (understory and litter biomass), as well as presence/absence data of C. undulatus. The highest probabilities of occupation were obtained in large forest patches (> 800 ha), connected ( 0.8 kg / m3 ) and with accumulated litter biomass (> 1.5 kg / m2). The results suggest that human impacts (deforestation, range thinning of cordilheiras, replacement of native vegetation by exotic pastures, and changes in structure of forest habitats due to livestok action) in Pantanal negatively influence the probabilities of occupancy by C. undulatus. Management practices that help the conservation of suitable habitats for wildlife are fundamental to achieve and maintain the ecological sustainability of cattle ranches in the Pantanal wetland. RESUMO: A fragmentação e as alterações na estrutura dos habitats florestais no Pantanal têm promovido significativas mudanças nos processos ecológicos e diversidade biológica regional. Este estudo objetivou avaliar como as variáveis da paisagem e do habitat afetam as probabilidades de ocupação de manchas florestais pelo jaó Crypturellus undulatus (Temminck, 1815) no oeste do Pantanal da Nhecolândia, Mato Grosso do Sul. De janeiro a outubro de 2008 foram amostrados 40 pontos distribuídos em manchas florestais em quatro áreas com diferentes condições de manejo. Nestes pontos foram obtidas variáveis da paisagem (área e distância entre as manchas florestais) e do habitat (biomassas de sub-bosque e serrapilheira), bem como dados de presença/ausência de C. undulatus. As maiores probabilidades de ocupação foram obtidas em manchas florestais grandes (> 800 ha), conectadas ( 0,8 kg/m3 de biomassa) e com elevado acúmulo de biomassa de serrapilheira (> 1,5 kg/m2 ). Os resultados sugerem que as intervenções humanas na paisagem (raleamento de cordilheiras, substituição de pastagens nativas por pastagens cultivadas exóticas e alteração na estrutura do habitat florestal por impacto do forrageio e pisoteio de gado bovino) no Pantanal podem afetar negativamente as populações de C. undulatus. Práticas de manejo que auxiliem a conservação de habitats favoráveis à vida selvagem são fundamentais para alcançar ou manter a sustentabilidade ecológica em fazendas de pecuária no Pantanal