Formation of safety conditions for development of deposits by open mining

The researched parameters of the catching device, which ensures the safe operation of equipment and working people in deep open pits, where are formed the benches by steep dipping layers. For obtaining the results, the following methods were used: analytical – in determining existing devices for the capture of rocks; geometric – in determining the direction of the flight of blocks, semigraphical – in plotting and analyzing them. The modern technological catching devices, their structure, construction are analyzed. These structures protective devices can be used in deep pits in the development of deposits. Analytical dependence of the height of the jump the block of rock after hitting about a horizontal surface is improved, which takes into account the rate of falling and the angle of rebound the block, the elasticity of the surface. Creating of catching designs which capture the blocks of rock in the falling from the upper horizons in open pits allows to operate safely the mining equipment and to save the lives of workers. Especially this is important in the development of deposits by steep dipping layers. Proposed solutions can improve the safe using of dump trucks and moving workers in the work zone in the mining ledges of height over 30 meters

Validity and reliability of the WIMU inertial device for the assessment of the vertical jump

El objetivo de este estudio fue comprobar la validez y fiabilidad del dispositivo inercial WIMU (Realtrack Systems SL, Almería, España) para la evaluación del salto vertical, salto de contramovimiento (CMJ) y salto en cuclillas (SJ). Quince jugadores de fútbol fueron evaluados en dos sesiones idénticas separadas por una semana. En cada sesión, los participantes realizaron tres saltos de cada tipo. El tiempo de vuelo fue cuantificado por el dispositivo inercial WIMU y por una plataforma de fuerza (Twin Plates; Globus Sport and Health Technologies LLC, Codogne', Italia) al mismo tiempo. Para el análisis de la fiabilidad del tiempo de vuelo del CMJ y del SJ, se utilizó el coeficiente de correlación intraclase. El cálculo de la validez concurrente se realizó utilizando el coeficiente de correlación de Pearson (r). Este análisis se complementó con la realización de los gráficos de Bland-Altman. Para el análisis de la fiabilidad se calculó el coeficiente de variación y el error estándar de las medias. El análisis presentó una alta validez y fiabilidad del dispositivo. Los resultados muestran que el dispositivo inercial WIMU (Realtrack Systems SL, Almerı´a'a, España) como una herramienta útil para medir la capacidad de salto de los atletas, presentando resultados inmediatos en tiempo real, en cualquier tipo de superficie y de forma sencilla ya que no necesita cables.The aim of this study was to test the validity and reliability of the inertial device WIMU (Realtrack Systems SL, Almería, Spain) for the assessment of the vertical jump, counter movement jump (CMJ) and squat jump (SJ). Fifteen soccer players were evaluated in two identical sessions separated by one week. In each session, participants performed three jumps of each type. The flight time was quantified by the inertial device WIMU and by a force platform (Twin Plates; Globus Sport and Health Technologies LLC, Codogne´, Italy) at the same time. For the analysis of reliability of the flight time of the CMJ and the SJ, the intraclass correlation coefficient was used. The calculation of the concurrent validity was performed by using the Pearson correlation coefficient (r). This analysis was complemented with the realization of the Bland–Altman plots. For the analysis of reliability, the coefficient of variation and the standard error of the means were calculated. The analysis presented a high validity and reliability of the device. The results show the inertial device WIMU (Realtrack Systems SL, Almerı´a, Spain) as a useful tool for measuring the jump capacity of the athletes, presenting immediate results in real time, on any type of surface and in a simple way since it does not need cables.• Gobierno de Extremadura. Ayuda GR15122peerReviewe

Validity and Test-retest Reliability of the Jumpo App for Jump Performance Measurement

International Journal of Exercise Science 14(7): 677-686, 2021. The vertical jump test is one of the simplest and most prevalent physical tests used in practice and research. This study investigated the validity and reliability of a new mobile application (Jumpo) for measuring jump performance on Android devices. University-aged students (n = 10; 20 ± 3 years; 176 ± 6 cm; 68 ± 9 kg) reported to the laboratory on three occasions (2-7 days apart): to be familiarized with the jump performance measurements and then for test-retest reliability assessments. Participants performed countermovement jumps (CMJ), squat jumps (SJ), and right and left single-legged jumps in random order on a force platform while being recorded by a smartphone’s slow-motion camera. Flight time was selected as the criterion variable. Strong positive correlations between the Jumpo and force platform were observed for each jump type tested (r ≥ 0.93), although the flight times obtained with the Jumpo App were systematically shorter than those provided by the force platform by 3-6% (p \u3c 0.001). The Jumpo App demonstrated a high test-retest reliability (ICC ≥ 0.94, CV ≤ 3.7%) with no differences between the coefficients of variation obtained from the Jumpo App and force platform (p ≥ 0.25). With respect to jump type, data from double-legged jumps (CMJ and SJ) were more accurately measured than data from single-legged jumps. The Jumpo App provides a valid and reliable measurement of jump performance, but the following equation should be used to calibrate its flight time results, allowing comparisons to be made to force platform data: Force platformflight time = 0.948 × Jumpoflight time + 41.515. Future studies should cross-validate the calibration equation in a different sample of individuals

C-FAR - Carbon footprinting of archaeological research: Data collection methodology and interim report

Carbon Footprinting of Archaeology Research (C-FAR) focused on developing a method of determining the carbon footprint of university-led archaeological training expeditions.British Academ

Concurrent validity and reliability of three ultra-portable vertical jump assessment technologies

publishedVersio

Validity of a Wireless Inertia Measurement Device in Quantifying Performance in Vertical Jumping Tests

The use of technology in sport and fitness training has rapidly become a tool for both athletes and coaches in monitoring performance variables for optimizing training stimulus and recovery (Duking, Hotho, Holmberg, Fuss, & Sperlich, 2016; Peake, Kerr & Sullivan, 2018). Wireless fitness trackers, GPS and accelerometry devices are growing in popularity with the athletic population outside of the clinical setting due to their lower cost and ease of use compared to traditional clinical measurement tools (Dellaserra, Gao & Ransdell, 2014). With the increased popularity of these devices comes the necessity to understand and validate the information collected from them (Kooiman et al., 2015). Previous research has validated the measurement capability of wireless inertia sensors in the collection of curvilinear and linear velocity during upper body resistance exercise compared to 3D motion capture, which suggests it as a useful tool in a coaching environment (Sato, Beckham, Carroll, Bazyler, & Sha, 2015). Furthermore, wired or anchored devices limit the variety of exercises that can be measured, and may also present potentially more difficulty in managing data collection amongst several athletes simultaneously (Sato et al., 2015). Studies have examined the reliability and validity of wireless inertial sensor measurement compared to currently validated wired measurement tools like the GymAware (Orange et al., 2018). The use of specific algorithms to detect and measure different exercises restricts the extrapolation of results related to validity and reliability from one exercise to another (Sato et al., 2015). Few studies have been performed in relation to the validity of wireless inertia devices on measurement of vertical jumping performance. Therefore, the purpose of this study was to investigate the validity of a wireless measurement device on several types of vertical jump exercise. Specifically, this investigation examined static, countermovement, and drop jumps as measured with a wireless sensor compared with commercially available force plates

Web-based Sports Scoring System for Trampoline Gymnastics Competitions

This work arises within the context of the Master’s Project in Computer Engineering - Mobile Computing course, at Escola Superior de Tecnologia e Gest˜ao do Instituto Polit´ecnico de Leiria. The aim of this work is to describe the work carried out over several months, in partnership with the Trampolins Clube de Leiria. This is a local club, and as such, with somewhat limited resources, such as the competitions they manage and organize their judging solution were in need of improvements in terms of organization, speed, data acquisition, trust in the data, and resilience. This work begins by presenting the methodology used, followed by a contextualization of the sport, and a brief presentation of some software available in the market. Next, a comparison between the various current technological solutions is presented, as a means of gathering the necessary information to make informed decisions for the presentation of a solution. There is also a chapter with the details of the proposed solution, a description of the technologies used, and the implementation details. Finally, various execution scenarios, tests, and questionnaires are analyzed, concluding with the project’s findings. The main goal of the project was to propose an architecture for a solution to be made available in trampoline competitions, in order to minimize manual processes and perform calculations automatically, thus reducing human error and accelerating the entire end-toend process. There was also the objective of, during the development of the proposed solution, having it tested in actual events, including regional, national, and international competitions. The project was successfully completed, with the club’s main goals achieved. The experience gained in the interactions of requirement gathering was enriching for everyone. In the real-life context, the application’s performance and output were accepted in all possible categories

Agreement between Force Platform and Smartphone Application-Derived Measures of Vertical Jump Height in Youth Grassroots Soccer Players

Given the importance of vertical jump assessments as a performance benchmarking tool, the assessment of neuromuscular function and indicator of health status, accurate assessment is essential. This study compared countermovement jump (CMJ) height assessed using MyJump2 (JHMJ) to force-platform-derived jump height calculated from time in the air (JHTIA) and take-off velocity (JHTOV) in youth grassroots soccer players. Thirty participants (Age: 8.7 ± 0.42 yrs; 9 females) completed bilateral CMJs on force platforms whilst jump height was simultaneously evaluated using MyJump2. Intraclass correlation coefficients (ICC), Standard error of measurement (SEM), coefficient of variance (CV) and Bland–Altman analysis were used to compare performance of MyJump2 to force-platform-derived measures of CMJ height. The median jump height was 15.5 cm. Despite a high level of agreement between JHTIA and JHTOV (ICC = 0.955), CV (6.6%), mean bias (1.33 ± 1.62 cm) and 95% limits of agreement (LoA −1.85–4.51 cm) were greater than in other comparisons. JHMJ performed marginally better than JHTIA when compared to JHTOV (ICC = 0.971; 95% CI’s = 0.956–0.981; SEM = 0.3 cm; CV = 5.7%; mean bias = 0.36 ± 1.61 cm; LoA = −3.52–2.80 cm). Irrespective of method, jump height did not differ between males and females (p > 0.381; r TIA and JHMJ should be used with caution. JHTOV should be used to guarantee accuracy in the calculation of jump height