46 research outputs found

    Stochastic processes with finite correlation time: modeling and application to the generalized Langevin equation

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    The kangaroo process (KP) is characterized by various forms of the covariance and can serve as a useful model of random noises. We discuss properties of that process for the exponential, stretched exponential and algebraic (power-law) covariances. Then we apply the KP as a model of noise in the generalized Langevin equation and simulate solutions by a Monte Carlo method. Some results appear to be incompatible with requirements of the fluctuation-dissipation theorem because probability distributions change when the process is inserted into the equation. We demonstrate how one can construct a model of noise free of that difficulty. This form of the KP is especially suitable for physical applications.Comment: 22 pages (RevTeX) and 4 figure

    Non-Markovian Levy diffusion in nonhomogeneous media

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    We study the diffusion equation with a position-dependent, power-law diffusion coefficient. The equation possesses the Riesz-Weyl fractional operator and includes a memory kernel. It is solved in the diffusion limit of small wave numbers. Two kernels are considered in detail: the exponential kernel, for which the problem resolves itself to the telegrapher's equation, and the power-law one. The resulting distributions have the form of the L\'evy process for any kernel. The renormalized fractional moment is introduced to compare different cases with respect to the diffusion properties of the system.Comment: 7 pages, 2 figure

    Molecular dynamics approach: from chaotic to statistical properties of compound nuclei

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    Statistical aspects of the dynamics of chaotic scattering in the classical model of α\alpha-cluster nuclei are studied. It is found that the dynamics governed by hyperbolic instabilities which results in an exponential decay of the survival probability evolves to a limiting energy distribution whose density develops the Boltzmann form. The angular distribution of the corresponding decay products shows symmetry with respect to π/2\pi/2 angle. Time estimated for the compound nucleus formation ranges within the order of 102110^{-21}s.Comment: 11 pages, LaTeX, non

    Korzyści z podejmowania regularnej aktywności fizycznej przez osoby starsze = The benefits of regular physical activity for the elderly

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    Kaźmierczak U., Radzimińska A., Dzierżanowski M., Bułatowicz I., Strojek K., Srokowski G., Zukow W. Korzyści z podejmowania regularnej aktywności fizycznej przez osoby starsze = The benefits of regular physical activity for the elderly. Journal of Education, Health and Sport. 2015;5(1):56-68. ISSN 2391-8306. DOI: 10.5281/zenodo.13935http://ojs.ukw.edu.pl/index.php/johs/article/view/2015%3B5%281%29%3A56-68https://pbn.nauka.gov.pl/works/524287http://dx.doi.org/10.5281/zenodo.13935Formerly Journal of Health Sciences. ISSN 1429-9623 / 2300-665X. Archives 2011 – 2014 http://journal.rsw.edu.pl/index.php/JHS/issue/archive Deklaracja.Specyfika i zawartość merytoryczna czasopisma nie ulega zmianie.Zgodnie z informacją MNiSW z dnia 2 czerwca 2014 r., że w roku 2014 nie będzie przeprowadzana ocena czasopism naukowych; czasopismo o zmienionym tytule otrzymuje tyle samo punktów co na wykazie czasopism naukowych z dnia 31 grudnia 2014 r.The journal has had 5 points in Ministry of Science and Higher Education of Poland parametric evaluation. Part B item 1089. (31.12.2014).© The Author (s) 2015;This article is published with open access at Licensee Open Journal Systems of Kazimierz Wielki University in Bydgoszcz, Poland and Radom University in Radom, PolandOpen Access. This article is distributed under the terms of the Creative Commons Attribution Noncommercial License which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited. This is an open access article licensed under the terms of the Creative Commons Attribution Non Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted, non commercial use, distribution and reproduction in any medium, provided the work is properly cited.This is an open access article licensed under the terms of the Creative Commons Attribution Non Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted, non commercialuse, distribution and reproduction in any medium, provided the work is properly cited.The authors declare that there is no conflict of interests regarding the publication of this paper.Received: 15.06.2014. Revised 05.10.2014. Accepted: 25.12.2014. Korzyści z podejmowania regularnej aktywności fizycznej przez osoby starszeThe benefits of regular physical activity for the elderly Kaźmierczak U.¹, Radzimińska A.¹, Dzierżanowski M.², Bułatowicz I.¹, Strojek K.¹, Srokowski G.¹, Zukow W.³ Katedra Fizjoterapii CM UMK w Toruniu1Zakład Kinezyterapii i Masażu Leczniczego UMK CM w Toruniu²Zakład Terapii Manualnej UMK CM w Toruniu3Wydział Kultury Fizycznej, Zdrowia i Turystyki, Uniwersytet Kazimierza Wielkiego w Bydgoszczy Słowa kluczowe: regularna aktywność fizyczna, osoby starsze. Keywords: regular physical activity, elderly. AbstraktW państwach rozwiniętych i rozwijających się coraz większą grupę społeczeństw stanowią seniorzy.Świadomość problemu spowodowała podjęcie powszechnej dyskusji ekspertów i praktyków z dziedzin medycznych na temat konieczności działań niezbędnych dla zapewnienia społeczeństwom pomyślnej starości.Od dawna wskazuje się, że brak aktywności ruchowej jest dla zdrowia niebezpieczny.Starzeniu się układu sercowo-naczyniowego towarzyszy dużo niekorzystnych zmian strukturalnych, czynnościowych i biochemicznych. Za typowe dla tego okresu zmiany uważa się osłabienie możliwości relaksacji włókien mięśniowych, co może być przyczyną rozkurczowej niewydolności serca.Trening zdrowotny – jest rodzajem aktywności fizycznej wykonywanej z powodów medycznych. Celem jest uzyskanie efektów fizycznych oraz psychicznych przeciwdziałających zmniejszaniu się zdolności adaptacyjnych organizmu.Eksperci przekonują osoby starsze o korzyściach płynących z aktywnego fizycznie stylu życia. Bogate piśmiennictwo poruszające tematykę medycznych aspektów procesu starzenia, mówi o niezaprzeczalnym znaczeniu ruchu dla toczących się w ludzkim ciele procesów inwolucyjnych. Aktywność fizyczna odpowiednio dozowana jest w stanie wyraźnie zmniejszyć negatywny wpływ tych zmian i jak najdłużej pozwolić utrzymać zdrowie fizyczne, psychiczne i społeczne. Zauważono, że systematycznie dozowany wysiłek fizyczny zmniejsza ryzyko wystąpienia wielu chorób np. cukrzycy, miażdżycy, choroby niedokrwiennej serca.Liczne badania naukowe i bogate piśmiennictwo gerontologiczne przedstawiają najnowsze doniesienia specjalistów o tym, jak należy prawidłowo przygotować i prowadzić trening fizyczny z osobami starszymi. Ludzki organizm zaczyna starzeć się około 20-25 roku życia. Zmiany dotyczą wszystkich układów ciała. Najbardziej odczuwalne w życiu codziennym są te, które zachodzą w układzie krążeniowo-oddechowym i mięśniowo-szkieletowym. Trening fizyczny dla osoby starszej, aby był skuteczny i bezpieczny, powinien być skonstruowany i nadzorowany przez specjalistę. AbstractIn developed and developing countries an increasing group of societies are seniors. Awareness of the problem has led to widespread discussion of experts and practitioners from the fields of medical devices on the need for the measures necessary to ensure that societies successful old age. For a long time, indicates that the lack of motor activity is dangerous to health. Aging of the cardiovascular system is accompanied by a lot of adverse structural changes and biochemical function.For typical of this period of change is believed to be weakening the possibility of relaxation of the muscle fibers, which may cause diastolic heart failure. Training of health-is a type of physical activity performed for medical reasons. The goal is to get mental and physical effects against reducing the adaptability of the body. Experts are finding older people about the benefits of a physically active lifestyle. Rich writing evocative theme of medical aspects of the aging process, speaks of undeniable importance for traffic in human flesh involutional processes. Physical activity appropriately dosed is able to clearly reduce the negative impact of these changes and as long as you can afford to maintain the physical, mental and social health. It was noted that systematically dosed exercise reduces the risk of many diseases, eg. diabetes mellitus, atherosclerosis, coronary heart disease.Numerous scientific studies and extensive external links gerontologiczne submit the latest reports of professionals about how to properly prepare and conduct physical training with the elderly. The human body begins to age about 20-25 years of age. The changes apply to all body systems. Most felt in everyday life are the ones that occur in the breathing cardiopulmonary and musculo-skeletal. Physical training for older persons, in order to be effective and safe, should be designed and supervised by a specialist

    Superposition rules for higher-order systems and their applications

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    Superposition rules form a class of functions that describe general solutions of systems of first-order ordinary differential equations in terms of generic families of particular solutions and certain constants. In this work we extend this notion and other related ones to systems of higher-order differential equations and analyse their properties. Several results concerning the existence of various types of superposition rules for higher-order systems are proved and illustrated with examples extracted from the physics and mathematics literature. In particular, two new superposition rules for second- and third-order Kummer--Schwarz equations are derived.Comment: (v2) 33 pages, some typos corrected, added some references and minor commentarie

    Objective assessment of lower limbs explosive strength performed on the participants of the Polish Nationwide Special Olympics Football Tournament in the scope of both legs jump on the dynamographic platform

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    Introduction. Explosive strength is a motor ability defined as an ability to develop a maximum strength in the shortest time. It is an essential feature of many sportspeople, including football players. To assess this strength for lower limbs, the following tests are implemented: CMJ and DJ tests, defined determinants of McClymont reactive strength or K indicator according to Bartonietz. It is also possible to objectively assess the jump research with the use of a dynamographic platform. 12 Aim of the study. The aim of the research was to determine explosive strength of lower limbs with the use of GAMMA dynamographic platform. Material and method. The participants of the Polish Nationwide Special Olympics Football Tournament were examined with the use of the GAMMA dynamographic platform. 57 people aged 20-30 were researched (44 boys, 13 girls). On the basis of the results, lower limbs explosive strength was determined. Results. The research depicted a wide range of the lower limbs explosive strength values of the Football Special Olympics participants. This also suggests significant differences of motor abilities of particular participants taking part in the tournament. Conclusions. Results concerning the dynamographic platforms usefulness in assessing sportspeople motor abilities as well as explosive strength of young active participants of the Special Olympics were formed
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