Search results for "Jump"
showing 10 items of 401 documents
Take-off analysis of the Olympic ski jumping competition (HS-106m).
2007
Abstract The take-off phase (approximately 6 m) of the jumps of all athletes participating in the individual HS-106 m hill ski jumping competition at the Torino Olympics was filmed with two high-speed cameras. The high altitude of the Pragelato ski jumping venue (1600 m) and slight tail wind in the final jumping round were expected to affect the results of this competition. The most significant correlation with the length of the jump was found in the in-run velocity ( r =0.628, p n =50). This was a surprise in Olympic level ski jumping, and suggests that good jumpers simply had smaller friction between their skis and the in-run tracks and/or the aerodynamic quality of their in-run position …
A sliding mode approach to H∞ synchronization of master–slave time-delay systems with Markovian jumping parameters and nonlinear uncertainties
2012
Author's version of an article published in the journal: Journal of the Franklin Institute. Also available from the publisher at: http://dx.doi.org/10.1016/j.jfranklin.2011.09.015 In this paper, a sliding-mode approach is proposed for exponential H∞ synchronization problem of a class of masterslave time-delay systems with both discrete and distributed time-delays, norm-bounded nonlinear uncertainties and Markovian switching parameters. Using an appropriate LyapunovKrasovskii functional, some delay-dependent sufficient conditions and a synchronization law, which include the masterslave parameters are established for designing a delay-dependent mode-dependent sliding mode exponential H∞ synch…
Effects of acute b-alanine supplementation on countermovement jump performance after a 4x400 m fatigue protocol: A randomized, double-blind, placebo-…
2022
This study aimed to examine the effect of acute beta-alanine (β-alanine) supplementation on jump performance after a strenuous fatigue protocol. Twelve healthy young men (age 21.4±0.5 years, body height 180.2±5.8 cm, body mass 76.6±9.2 kg) volunteered to participate in this randomized, double-blind, placebo-controlled trial. The experimental group ingested 3.2 g of β-alanine (separated into two 1.6 g dosages) mixed with 23 g of glucose, whereas the placebo group ingested two dosages containing 23 g of glucose. Following the supplementation intake, participants completed a jump protocol involving countermovement jump (CMJ) and four consecutive countermovement jumps (CMJ-4). Subsequently, a 4…
Progresīvās tīmekļa lietojumprogrammas
2019
Darbā tiek analizēta progresīvās tīmekļa lietojumprogrammas (PWA) tehnoloģija, veikta tās testēšana un PWA pielietojumu salīdzinoša analīze. Praktiskajā daļā tika veidots prototips iekšējai uzņēmuma vietnei, kā arī tika analizēta progresīvas tīmekļa lietojumprogrammas nepieciešamība tās veidošanai. Darba mērķis: Vietnes prototipu veidošana un progresīvo tīmekļu lietotnes salīdzinājuma analīze. Darba uzdevumi: •Izpētīt progresīvās tīmekļa lietojumprogrammas būtību •Izanalizēt statistiku par lietotnes popularitāti •Izanalizēt tās pielietojumu pasaulē •Izanalizēt tās pielietojumu Latvijā •Progresīvās tīmekļa lietojumprogrammas priekšrocības un trūkumi •Izstrādāt Scandiweb vietnes prototipu un …
Training the Vertical Jump to Head the Ball in Soccer
2012
R esearchers involved in the training methodology to improve jump ability proposed a variety of techniques and exercise modalities (22,15,4). Nevertheless, the question on what percentage of training should be dedicated to strength and what to power seems unresolved. First of all, to better understand the matter, we have to stress the difference between strength and power. Generally speaking, in athletics, the rate of force development (RFD) is much more important than strength alone; the average RFD (mRFD) can be estimated as the ratio Fmax/Tmax, where Tmax is the time to reach the peak force, whereas Fmax is the maximum force. This ratio is also named explosive strength, commonly computed…
Lietotāju identifikācija
2018
Šajā kvalifikācijas darbā ir izstrādāta Mifare 1k bezkontakta karšu pārvaldīšanas lietojumprogramma datoriem ar Windows operētājsistēmu. Šī lietojumprogramma ir izveidota c# programmēšanas valodā un tā sastāv no vairākām daļām, kas veic katra savu funkciju. Pirmā daļa ir paredzēta darbinieku identificēšanai ar bezkontakta kartes palīdzību un to autorizēšanai sistēmā. Otrā daļa ir paredzēta alpīnisma torņa instruktoriem, lai tie varētu pārvaldīt alpīnisma torni un tā klientus. Klientiem tiks izsniegtas Mifare 1k bezkontakta aproces, ar kurām tos varēs identificēt un attiecīgi sākt un beigt viņu kāpienu alpīnisma tornī. Trešā daļa ir domāta administrācijas darbiniekiem, kuri pārvaldītu šīs be…
Totally asymmetric exclusion process fed by using a non-Poissonian clock
2015
In this article we consider the one-dimensional totally asymmetric open-boundary exclusion process fed by a process with power-law-distributed waiting times. More specifically, we use a modified Pareto distribution to define the jump rate for jumps into the system. We then characterize the propagation of fluctuations through the system by kinetic Monte Carlo simulations and by numerical evaluation of the steady-state partition function. peerReviewed
Altération des performances neuromusculaires après un exercice physique prolongé. Analyse comparée d'une épreuve de marathon et de triathlon
1998
The aim of this study was to compare the effects of a marathon and a triathlon on isometric and dynamic neuromuscular performances. Seven triathletes took part in 3 experimental situations : a 2 h 15 mn triathlon (TRI) (30 min swimming, 60 min cycling and 45 min running), a 2 h 15 mn marathon (MA) and a 45 min isolated run done at triathlon speed. The results showed a reduction of the isometric endurance time for knee extensor muscles (35 % of maximal voluntary contraction) after TRI (41 ± 24 %) and after MA (59 ± 19 %). The height of rise of the center of gravity of the counter-movement jumps (CMJ) was also significantly lower after MA (-12 ± 1 cm) than after TRI (-2,5 0,5 cm). Kinetic ana…
Analysis of body composition and blood parameters on 20 subjects after 6 months of training with SuperJump
2014
The “Jill Cooper’s aerobic accellerator system” uses high quality rebound, modified to increase the acceleration, create a more accommodating work surface, greater stability and cushioning to protect joints. Thanks to the three forces of acceleration, deceleration, and the force of gravity, for each jump, the one-way valves of the lymphatic pathways open and close pushing the lymph towards the next “closed”. This action allows the lymphatic system to make a full turn faster than usual. We investigate the effects of 6 months of training on 20 subjects (age: 37 ± 19; weight: 74 ± 19 Kg; height:164,5 ± 13,5 cm; BMI: 28,13 ± 6,876 Kg/m2; % body fat: 26 ± 14,7 Kg). Antropometric parameters were …
Is it still important to be light in ski jumping?
2019
In ski jumping low body weight development resulted in some serious underweight problems and therefore the International Ski Federation (FIS) decided to solve the problem by relating maximum ski length to Body Mass Index (BMI) in 2004. The present study examined the current relationship between body weight, ski length and performance (jumping distance) in ski jumping. By adopting the BMI regulation to specifications for competition equipment, the FIS succeeded in stopping the alarming development of underweight problems in ski jumping. However, as the results of the present study show, the BMI regulation adopted by the FIS has reduced the advantage of being light, but despite the use of sho…