Search Results

You are looking at 1 - 8 of 8 items for

  • Author: T. Urban x
Clear All Modify Search
Open access

T. L. Urban

Abstract

This study analyzed the effect of a disproportionate amount of time between rounds of a playoff series—known as the “rest vs. rust” debate in the popular sports media—on the likelihood of winning each game of the subsequent round of the tournament. We utilized NBA Finals data from 1984 – 2018, and analyzed this phenomenon using ordered logistic regression with a categorical dependent variable representing the margin of victory of each game. In addition to several control variables, variables reflecting the difference in the time between series for the two teams were used to measure this effect. The results indicate that having additional time between rounds of the series provides a statistically significant advantage; interestingly, though, it has more of an impact on the second game of the subsequent round than it does for the first game. Teams may utilize the results of this study when deciding on how to schedule and intensify their practice sessions, by providing appropriate rest and maintaining rhythm to increase the likelihood of winning each game.

Open access

T. Strzelecki and M. Bartlewska-Urban

Abstract

This paper presents simulation results of the consolidation process of the flotation waste landfill “Zelazny Most”. The mathematical model used in presented research is based on Biot’s model of consolidation and is extended with rheological skeleton. The load is the mass pressure of the landfill itself. The initial point selected for calculations was based on the ground water level calculated in a landfill. The creeping process in this waste landfill was analyzed along the north - south section. The solution is therefore 2D with the assumption of a plane strain state. Effective model parameters data were obtained in laboratory tests on the material from the waste landfill. Results obtained for a stress state in a storage state can help to determine whether the adopted linear model of visco-elastic medium does not lead to changes in the Coulomb - Mohr potential yield, showing the emergence of plasticity of material storage areas.

Open access

Tomás Urbán, Óscar Gutiérrez and Francisco J. Moreno

Abstract

The execution variability and outcomes found in throwing actions have received special attention in numerous studies in recent years. The aim of this study was to analyze the effect of an unstable condition on velocity, accuracy and kinematics of movement in the seven metres throw in handball. Twenty-five young handball players took part in an experiment, throwing towards a target on a stable and an unstable surface. Each participant performed 32 throws, 16 for each situation. Linear variability of the dominant hand was assessed by 3D Motion Tracking. A radar sports gun was used to record the velocity of the ball and the throws were video recorded to establish their accuracy. Results showed significant decreases in throwing velocity in unstable conditions, but these did not significantly affect the accuracy achieved in performance. Differences were also found in movement kinematics between the two throwing conditions and relationships were found between kinematics, velocity and accuracy.

Open access

T. Urban and J. Tarka

Abstract

The paper describes experimental research of slab-column connections examined on specimen designed as a part of reinforced concrete structure with flat slabs. The aim of the research was to verify the efficiency of slab reinforcement concept against punching shear by increasing slab’s mechanical reinforcement ratio by applying additional external reinforcement in the form of carbon fiber reinforced polymer (CFRP) strips. The capacity enhancement in comparison to unstrengthened slab obtained 36%.

Open access

M. Bartlewska-Urban and T. Strzelecki

Abstract

In the study described here model calibration was performed employing the inverse analysis using genetic algorithms (GA). The objective of analysis is to determine value of the coefficient of hydraulic conductivity, k. The commonly used method for the determination of coefficient of hydraulic conductivity based on Terzaghi consolidation leads to an underestimation of the value of k as the Terzaghi model does not take into account the deformation of soil skeleton. Here, an alternative methodology based on genetic algorithms is presented for the determination of the basic parameters of Biot consolidation model. It has been demonstrated that genetic algorithms are a highly effective tool enabling automatic calibration based on simple rules. The values of the coefficient of hydraulic conductivity obtained with GA are of at least one order smaller than values obtained with the Terzaghi model.

Open access

T. Urban, M. Gołdyn, J. Krakowski and Ł. Krawczyk

Abstract

The results of experimental test of nine thickset reinforced concrete slabs in punching are presented in the this paper. The aim of the tests was verification of the Eurocode EC 2 procedure, by which the ultimate shear stresses vRd,c depend on the slenderness of the slab. Besides of the performed tests results, the analysis of the foreign investigation of the fundaments is also included. The test results, as well as other tests, show the correctness of the function assumed in Eurocode 2, which gives correlation between ultimate stresses vRd,c and shear slenderness.

Open access

I Skornova, M Samos, R Simonova, J Zolkova, L Stanciakova, L Vadelová, T Bolek, L Urban, F Kovar, J Stasko, P Galajda, P Kubisz and M. Mokan

Abstract

Objectives: Several studies have questioned the need for platelet function testing in patients treated with new ADP receptor blockers (ADPRB). The aim of this study was to evaluate the prevalence of high on-treatment platelet reactivity (HTPR) among acute ST-elevation myocardial infarction (STEMI) patients treated with newer ADPRB.

Methods: A prospective study enrolling 44 acute previously ADPRB naive STEMI patients (31 men, 13 women) undergoing primary percutaneous coronary intervention (pPCI) was performed. Among the studied population 23 patients received prasugrel and 21 patients received ticagrelor. Antiplatelet response was tested with light transmission aggregometry (LTA) and vasodilator-stimulated phosphoprotein phosphorylation (VASP-P) flow cytometry assay. Samples were taken prior to coronary angiography (sample 1) and on the day after this procedure (sample 2).

Results: The mean platelet aggregation after induction with ADP was 51.7 ± 24.8% in sample 1 and 25.3 ± 20.1% in sample 2. An examination of VASP-P showed a mean platelet reactivity index of 56.8 ± 25.7% in sample 1 and 23.8 ± 23.1% in sample 2, respectively. The study identified 11.4% of patients in sample 2 as ADP receptor blocker non-responders. No significant differences were found between prasugrel-treated to ticagrelor-treated patients.

Conclusions: This pilot study demonstrated HTPR among acute STEMI patients treated with newer ADPRB.

Open access

Urszula Bielczyk, Paweł Czarnota, Martin Kukwa, Lucyna Śliwa, Robert Kościelniak, Laura Betleja, Ryszard Kozik, Beata Krzewicka, Mariusz Hachułka, Edyta Adamska, Michał Węgrzyn, Dominika Bielec, Adam Flakus, Beata Guzow-Krzemińska, Katarzyna Kolanko, Joanna Kozik, Grzegorz Leśniański, Maja Lisowska, Magdalena Oset, Piotr Osyczka, Katarzyna Pietrzykowska-Urban, Anna Sadowska-Deś, Agnieszka Słaby, Elżbieta Studzińska-Sroka, Karina Wilk, Piotr T. Zaniewski and Daria Zarabska-Bożejewicz

Abstract

The paper lists 337 species from Magurski National Park (MNP): 314 lichens, 18 lichenicolous fungi, four saprotrophic fungi and one lichenicolous myxomycete; 112 of them are new for MNP, 75 are reported for the first time for the Beskid Niski Mts, and two are new for Poland. Selected species are accompanied by taxonomic notes and remarks on their distribution in Poland and other Carpathian ranges. First records of Intralichen lichenicola, Burgoa angulosa and Verrucaria policensis and a second record of Epigloea urosperma are given for the whole Carpathian range, and Fuscidea arboricola was recorded for the first time in the Western Carpathians. Halecania viridescens and Mycomicrothelia confusa are new for the Polish Carpathians. The records of Absconditella pauxilla, Collema crispum, Licea parasitica and Rinodina griseosoralifera in MNP are their second known localities for the range. 93 species, mainly rare or threatened in Poland, were reported from MNP in the 20th century but were not refound.