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101.
102.
ABSTRACTConservation of wooden objects exposed outdoors is extremely difficult and complex due to their constant exposure to fluctuating weather conditions and biological degradation. Filling the gaps in such objects requires the use of specific materials that in particular can adapt to changes in wood dimensions in response to humidity variations. Various materials have been used so far for filling voids in wooden artefacts but none of them was entirely suitable. Therefore, the authors have attempted to provide the basic characteristics of the selected commonly used filling materials based on pine wood powder or glass microballoons as fillers and Paraloid® B-72, Klucel® G, or glutin glue as binders, as the first step in research aiming at developing new and more appropriate gap-fillers. Special attention was paid to the dimensional stability of filling materials upon drying and exposure to water vapour and liquid water. The overall results indicate that among the examined fills those consisting of Paraloid® B-72 and glass microballoons revealed best properties as they were relatively dimensionally stable upon drying and exposure to moisture – despite high absorption of water – and were quite easy to finish. Generally, better properties were observed for filling materials containing higher concentrations of adhesives and these materials will be modified in the next step of the research. Since the main drawbacks of the examined gap-fillers were low water resistance, poor dimensional stability upon drying or exposure to water vapour or liquid water, and fragility or friability, future research into their modification will head towards improvement of the above-mentioned properties. 相似文献
103.
Kowalska-Chrzanowska Małgorzata Krysiński Przemysław Karwowski Marcin Paweł 《Education and Information Technologies》2021,26(3):3427-3444
Education and Information Technologies - The purpose of the article is to describe the trainings implemented as part of the project “E-Active Residents of the Kuyavian-Pomeranian and... 相似文献
104.
Chuderski Adam Jastrzębski Jan Kroczek Bartłomiej Kucwaj Hanna Ociepka Michał 《Metacognition and Learning》2021,16(1):15-35
Metacognition and Learning - Participants rated Intuition, Suddenness, Pleasure, and Certainty accompanying their solutions to items of a popular fluid intelligence test – Raven’s... 相似文献
105.
Przemysław Strożek 《Soccer & Society》2017,18(4):476-496
This essay examines the relationships between football and art in Poland since the launch of the first 1921 Polish Football Championship until 2012, when the European Cup was held in Poland and Ukraine, testifying to a veritable craze for the national game, and cementing football’s place in cultural discourse. From pre-war painterly references to football, through Neo-avant-garde tendencies in the 1970s, to young Polish art, football has signified multiple meanings within national/transnational and gender discourse. Through the lens of artistic references to football this paper aims to comment on the cultural and social conditions around masculinity and star culture, and to reflect the broader social and political currents of contemporary Poland. 相似文献
106.
Mariusz Naczk Artur Lopacinski Wioletta Brzenczek-Owczarzak Jarosław Arlet Alicja Naczk Zdzisław Adach 《European Journal of Sport Science》2017,17(4):369-377
The aim of this study was to evaluate the influence of dry-land inertial training (IT) on muscle force, muscle power, and swimming performance. Fourteen young, national-level, competitive swimmers were randomly divided into IT and control (C) groups. The experiment lasted four weeks, during which time both groups underwent their regular swimming training. In addition, the IT group underwent IT using the Inertial Training Measurement System (ITMS) three times per week. The muscle groups involved during the upsweep phase of the arm stroke in front crawl and butterfly stroke were trained. Before and after training, muscle force and power were measured under IT conditions. Simultaneously with the biomechanical measurements on the ITMS, the electrical activity of the triceps brachii was registered. After four weeks of training, a 12.8% increase in the muscle force and 14.2% increase in the muscle power (p?<?.05) were noted in the IT group. Moreover, electromyography amplitude of triceps brachii recorded during strength measurements increased by 22.7% in the IT group. Moreover, swimming velocity in the 100?m butterfly and 50?m freestyle improved significantly following the four weeks of dry-land IT (?1.86% and ?0.76%, respectively). Changes in the C group were trivial. Moreover, values of force and power registered during the ITMS test correlated negatively with the 100?m butterfly and 50?m freestyle swimming times (r value ranged from ?.80 to ?.91). These results suggest that IT can be useful in swimming practice. 相似文献
107.
Equality in education in Eastern European countries 总被引:1,自引:0,他引:1
Mikołaj Kozakiewicz 《Prospects》1980,10(2):174-180
108.
The paper concerns compressed sensing methods in the quaternion algebra. We prove that it is possible to uniquely reconstruct – by ?1 norm minimization – a sparse quaternion signal from a limited number of its real linear measurements, provided the measurement matrix satisfies so-called restricted isometry property with a sufficiently small constant. We also provide error estimates for the approximated reconstruction of a non-sparse quaternion signal from noisy and noiseless data. 相似文献
109.
Józefa Brągiel Przemysław E. Kaniok 《Journal of Research in Special Educational Needs》2014,14(1):43-50
The main purpose of this study is to examine whether fathers' involvement with their child with disabilities is correlated with some of the demographic variables. Data were collected from 243 Polish fathers who were married and who had at least one child with disabilities. The issue was assessed by two measures: a Questionnaire and the Father Involvement Scale. The results of the multiple regression show that fathers' involvement is significantly (P < 0.05) correlated with the level of fathers' concentration on the needs of their child with disabilities, the level of fathers' cooperation with their wives, the number of years during which parents cared for a child with disabilities, time devoted by fathers daily for their child with disabilities, fathers' self‐esteem, fathers' education, the level of disability of a child, the level of fathers' skills in dealing with their child with disabilities and the level of fathers' knowledge about their child with disabilities. A video abstract of this article can be viewed at: http://youtu.be/XpTojch0j9Y 相似文献
110.
Ewa St?pień Krzysztof Gruszczyński Przemys?aw Kapusta Artur Kowalik Iwona Wybrańska 《Biochemia medica : ?asopis Hrvatskoga dru?tva medicinskih biokemi?ara / HDMB》2015,25(2):222-229