1,244 research outputs found
Estimation of temporal parameters during sprint running using a trunk-mounted inertial measurement unit
No full textThis research was supported by a grant of the Universit a Italo-Francese (Call Vinci) awarded to E. Bergamini.The purpose of this study was to identify consistent features in the signals supplied by a single inertial measurement unit (IMU), or thereof derived, for the identification of foot-strike and foot-off instants of time and for the estimation of stance and stride duration during the maintenance phase of sprint running. Maximal sprint runs were performed on tartan tracks by five amateur and six elite athletes, and durations derived from the IMU data were validated using force platforms and a high-speed video camera, respectively, for the two groups. The IMU was positioned on the lower back trunk (L1 level) of each athlete. The magnitudes of the acceleration and angular velocity vectors measured by the IMU, as well as their wavelet-mediated first and second derivatives were computed, and features related to foot-strike and foot-off events sought. No consistent features were found on the acceleration signal or on its first and second derivatives. Conversely, the foot-strike and foot-off events could be identified from features exhibited by the second derivative of the angular velocity magnitude. An average absolute difference of 0.005 s was found between IMU and reference estimates, for both stance and stride duration and for both amateur and elite athletes. The 95% limits of agreement of this difference were less than 0.025 s. The results proved that a single, trunk-mounted IMU is suitable to estimate stance and stride duration during sprint running, providing the opportunity to collect information in the field, without constraining or limiting athletes’ and coaches’ activities
Improving the performance of the trolley supply chain with a focus on visibility.
No full textThe lack of visibility, significant investment and a presumption of fleet shrinkage falter the decision-making process of a Dutch airline. Five decision areas have been identified and for each decision area improvements strategies or alternatives have been designed. Selecting the best alternative per decision area is a multi-criteria decision making problem. Therefore, a more sophisticated method is required to support the decision-maker. For this problem the novel Best-Worst Multi-Criteria Decision Making Method (BWM) has been selected. The BWM has been successfully applied to select the best alternative per decision area. Next steps for the airline are the implementation of the chosen alternatives.SEPAMTransport & LogisticsTechnology, Policy and Managemen
Buckfast Abbey Archaeological Projects 1982-2016 Photographic Archive
No full textThis photographic archive is intended to augment the two publications on the abbey's archaeology by S.W. Brown (Proceedings of the Devon Archaeological Society 46, 1988, 13-89; and Devon Archaeological Society Occasional Paper 21, 2018) and the series of more detailed interim archive reports appearing on the ADS website (unpublished grey literature, accessible via author Stewart Brown)
Documentation and preliminary validation of H2OTRANS and DAYTRANS, two models for predicting transpiration and water stress in western coniferous forests
No full textAm I nearly there? The effect of anticipated running distance on perceived exertion and attentional focus
No full textTwo studies tested the hypothesis that teleoanticipatory mechanisms regulate the perception of exertion (RPE) in the context of expected exercise duration by the adjustment of attentional focus. Study 1 involved 22 runners who participated in a short (8-mile) run and a long (10-mile) run on separate days. Pace did not differ between conditions (M = 6.3 mph). Runners reported on their attentional focus (proportion of associative to dissociative thoughts) and RPE at regular intervals. Study 2 involved 40 participants who ran twice on a treadmill at the same speed and gradient: once when they expected to run for 10 min (short condition) and once when they expected to run for 20 min (long condition). In both studies, RPE was lower throughout the long condition. In Study 1 there were more dissociative thoughts in the long condition. Study 2 showed the same trend, although the results were nonsignificant. In both studies RPE was inversely correlated with dissociative thoughts, supporting the hypothesis that runners pace themselves cognitively by manipulating their attentional focus
Effects of Climate and Lifeporm on Dry Matter Yield (E) from Simulations Using Biome-BGC
No full text
Environment-insensitive two-photon ratiometric probe for in cellulo quantitative measurement of hydrogen peroxide
No full textThe quantitative analysis of a biological analyte directly through fluorescence imaging is essential in biomedical sciences but remains as a challenge owing to the environment-sensitive nature of fluorescence intensity. We show that a fluorescent hydrogen peroxide probe based on an in cellulo super-bright benzothiazolyl-benzocoumarin dye of which emission properties are insensitive to environmental changes offers a reliable and practical means for the quantitative analysis of hydrogen peroxide in cells and tissues directly through ratiometric imaging both under one-photon and two-photon excitation conditions. Different cellular hydrogen peroxide concentrations were determined for several cell lines and also for tumour and normal tissues. © 2021 The Author(s)11Nscopu
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