Jan Długosz University

About: Jan Długosz University is a education organization based out in Częstochowa, Poland. It is known for research contribution in the topics: Crystal structure & Luminescence. The organization has 749 authors who have published 2311 publications receiving 19395 citations. The organization is also known as: Higher Teacher Education School.

The influence of gender, dominant lower limb and type of target on the velocity of taekwon-do front kick

Abstract: PURPOSE The current study aimed to quantify the main influences and the interactions (joint effects) of gender, leg and type of target on the biomechanics of front kick quality. Through the quantification, we tried to identify the relevant factors related to the kick accuracy and maximum velocity for coaching practice. METHODS A ten-camera NIR VICON MX40 motion capture system (250 Hz) was used to determine the kicking foot maximum velocity from two well-trained subject groups (8 males and 6 females). Each subject performed both left and right front kicks in a lateral standing position into the air (without a physical target), to a board, to a table tennis ball and to a training shield. The target were set on a height corresponding to a height of solar plexus of each participant. RESULTS The results showed that all the three factors (gender, leg and type of target) have significant influences on kicking speed ( p < 0.001) and significant interaction (joint effect) was only found between gender and target ( p < 0.001). Further analysis revealed that the males' kicking maximum velocity was affected more by board, while females' one was affected by the size of the target. CONCLUSIONS The results would seem to suggest that, for males, kick-to-a-board may be the more effective method for increasing kick quality, compared to other type of target. For females, kick-to-a-small-ball appears to be effective method for increasing kick maximum velocity.

Kirkamflata, a New Planthopper Genus from Socotra Island (Hemiptera: Fulgoromorpha: Flatidae)

Abstract: . The paper describes a new genus of the Hemiptera: Fulgoromorpha: Flatidae, Kirkamflata gen. nov., and a new species K. socotrana sp. nov. from the Hagher Mountains in central Socotra island (Yemen). Habitus, external morphology, male and female terminalia and internal genital structures of the new species are illustrated. The new genus is similar to Latois Stal, 1866 in head morphology, wing shape and venation, male and female terminalia but differs in a rudimentary median carina on pronotum and mesonotum, longer apical cells of tegmen and details of the male reproductive parts: style, periandrium, aedeagus, as well as female ones: gonapophysis VIII and diverticulum ductus.

Specific Features of Content Dependences for Energy Gap in In_{x}Tl_{1-x}I Solid State Crystalline Alloys

Abstract: Specific Features of Content Dependences for Energy Gap in InxTl1−xI Solid State Crystalline Alloys A.I. Kashuba, M. Piasecki, O.V. Bovgyra, V.Yo. Stadnyk, P. Demchenko, A. Fedorchuk, A.V. Franiv and B. Andriyevskye,∗ Physics Faculty, Ivan Franko National University of Lviv, Kyrylo and Mephodiy str. 8a, Lviv, 79005, Ukraine Institute of Physics, Jan Długosz University Częstochowa, Armii Krajowej 13/15, Częstochowa, Poland Department of Inorganic Chemistry, Ivan Franko National University of Lviv, Kyryla and Mephodiy Str. 6, Lviv, 79005, Ukraine Department of Inorganic and Organic Chemistry, Lviv National University of Veterinary Medicine and Biotechnologies, Pekarska Str. 50, 79010 Lviv, Ukraine Faculty of Electronics and Computer Sciences, Koszalin University of Technology, Śniadeckich 2, PL-75453, Koszalin, Poland

High-density lead-free K0.5Bi0.5TiO3 ceramics: preparation, mechanical and dielectric properties

Abstract: The preparation of high-density lead-free potassium-bismuth titanate K0.5Bi0.5TiO3 about 96–98% of the calculated density (X-ray), confirmed by the Archimedes method, is presented. All stages of th...