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    Wyświetlanie 1-14 z 14
    Tytuł:
    Numerical analysis of the temperature impact to the oxygen distribution in the biological tissue
    Autorzy:
    Jasiński, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/1839761.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    oxygen transport
    Krogh cylinder
    oxyhemoglobin dissociation curve
    hypoxia
    finite difference method
    transport tlenu
    cylinder Krogha
    krzywa dysocjacji oksyhemoglobiny
    niedotlenienie
    metoda różnic skończonych
    Opis:
    The aim of the study was to analyze changes in tissue oxygen distribution resulting from temperature changes by the use of the Krogh cylinder model with Michaelis-Menten kinetics. A Hill model was also used to describe the oxyhemoglobin dissociation curve. In particular, variable values of parameters of dissociation curve and blood velocity in capillary were considered. Mathematical description was based on two separate equations for radial and axial directions. An additional task related to determination of the temperature, tissue thermal damage and perfusion was also solved. At the stage of numerical realization, the finite difference method was used.
    Źródło:
    Journal of Applied Mathematics and Computational Mechanics; 2020, 19, 3; 17-28
    2299-9965
    Pojawia się w:
    Journal of Applied Mathematics and Computational Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical analysis of the thermal damage process of the tissue-blood vessel system and distribution of oxygen in the tissue
    Autorzy:
    Jasiński, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/2086966.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    bioheat transfer
    oxygen transport
    Arrhenius integral
    laser-tissue interactions
    Opis:
    The paper presents a numerical analysis of the thermal damage process taking place in biological tissue containing a blood vessel during laser irradiation. The internal heat source resulting from laser irradiation based on the solution of the optical diffusion equation is taken into account. The investigation was concerned with the influence of tissue denaturation and oxygen content in blood on temperature distribution. The analysis of oxygen transport to the tissue is treated as a part of the analysis of thermal damage processes. At the stage of numerical computations, the boundary element method and the finite difference method were used.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2022, 60, 2; 199--212
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Psychological Difficulties of Adapting to the Aging Process
    Psychologiczne trudności w adaptacji do procesu starzenia się u człowieka
    Autorzy:
    Jasiński, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/950765.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet w Białymstoku. Wydawnictwo Uniwersytetu w Białymstoku
    Tematy:
    starość
    psychoanaliza
    terapia behawioralno-poznawcza
    zmienne osobowościowe
    old age
    psychoanalysis
    cognitive-behavioral therapy
    personality
    changes
    Opis:
    This article is based on clinical observations and will discuss the psychological difficulties of adapting to old age from a psychodynamic perspective. To this end, the first part of this article discusses the normalcy of the aging process. Then, this article will analyze a variety of psychological variables that either disturb or accompany this process such as personality changes, body image, personal and professional fulfillment, satisfaction in relationships, self-esteem, acceptance of changes, and many more. The role of intimacy in old age will be discussed in a separate section, since this is an important element that has a significant impact on an individual’s ability to adjust to the aging process. Among other things, this article also considers such issues as resolving basic intrapsychic conflicts, the ability to draw from one’s inner strength and appeal to the constructive part of oneself, mourning various types of loss, establishing a realistic understanding of one’s self in relation to one’s ideal image of oneself, achieving inner harmony, etc. A cognitive approach will be used to present fundamental references to this topic.
    W pierwszej części artykułu omówione zostaną prawidłowości procesu starzenia się u człowieka. Następnie analizowane będą różnorodne zmienne psychologiczne mogące mieć wpływ na zakłócenia w tym procesie, takie jak: zmienne osobowościowe, obraz ciała, spełnienie w roli osobistej i zawodowej, satysfakcja z relacji partnerskiej, samoocena, akceptacja procesu przemijania i zmian temu towarzyszących i wiele innych. W osobnym punkcie omówione zostaną zagadnienia życia intymnego w wieku starczym jako istotnym elemencie mogącym mieć znaczący wpływ na przebieg procesu adaptacji do procesu starzenia. Całość zaprezentowana zostanie z perspektywy psychodynamicznej, bazującej na obserwacjach klinicznych autora tego doniesienia, który praktykuje w tym nurcie od wielu lat. Poruszane będą m.in. takie kwestie jak: rozwiązywanie podstawowych konfliktów intrapsychicznych, umiejętność czerpania z wewnętrznej siły i odwoływanie się do części konstruktywnej w sobie, przeżycie żałoby po różnego typu utratach, budowanie adekwatnego obrazu siebie w stosunku do idealistycznego wyobrażenia, uzyskanie wewnętrznej harmonii itp. Zaprezentowane zostaną też podstawowe odniesienia do tematu w ujęciu poznawczym.
    Źródło:
    Rocznik Teologii Katolickiej; 2017, 16, 2
    1644-8855
    Pojawia się w:
    Rocznik Teologii Katolickiej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical analysis of thermal damage and oxygen distribution in laser irradiated tissue
    Autorzy:
    Jasiński, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/2175523.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    bioheat transfer
    optical diffusion equation
    Arrhenius scheme
    oxygen transport
    Krogh cylinder
    boundary element method
    finite difference method
    przepływ biociepła
    równanie dyfuzji optycznej
    schemat Arrheniusa
    transport tlenu
    cylinder Krogha
    metoda elementów brzegowych
    metoda różnic skończonych
    Opis:
    A numerical analysis of the thermal damage process that proceeds in biological tissue during laser irradiation is presented. Heat transfer in the tissue is assumed to be transient and two-dimensional. The internal heat source resulting from the laser irradiation based on the solution of optical diffusion equation is taken into account. Changes in tissue oxygen distribution resulting from temperature changes are analyzed using the Krogh cylinder model with Michaelis-Menten kinetics. A Hill model was used to describe the oxyhemoglobin dissociation curve. At the stage of numerical realization, the boundary element method and the finite difference method have been applied.
    Źródło:
    Journal of Applied Mathematics and Computational Mechanics; 2022, 21, 2; 51--62
    2299-9965
    Pojawia się w:
    Journal of Applied Mathematics and Computational Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling of biological tissue damage process with application of interval arithmetic
    Autorzy:
    Korczak, Anna
    Jasiński, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/279929.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    directed interval arithmetic
    bioheat transfer
    optical diffusion equation
    Arrhenius scheme
    Opis:
    In the paper, the numerical analysis of thermal processes proceeding in a 2D soft biological tissue subjected to laser irradiation is presented. The transient heat transfer is described by the bioheat transfer equation in Pennes formulation. The internal heat source resulting from the laser-tissue interaction based on the solution of the diffusion equation is taken into account. Thermophysical and optical parameters of the tissue are assumed as directed intervals numbers. At the stage of numerical realization. the interval finite difference method has been applied. In the final part of the paper, the results obtained are shown.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2019, 57, 1; 249-261
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modeling of the influence of elevated temperature on oxygen distribution in soft tissue
    Autorzy:
    Jasiński, Marek
    Zadoń, Maria
    Powiązania:
    https://bibliotekanauki.pl/articles/38910037.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Podstawowych Problemów Techniki PAN
    Tematy:
    bioheat transfer
    tissue thermal damage
    oxygen transport
    Krogh cylinder
    oxyhemoglobin dissociation curve
    finite difference method
    shooting method
    sensitivity analysis
    Opis:
    The purpose of the study was to analyze the combined model of bioheat transfer and oxygen distribution in tissue during exposition to the external heat impulse. The effect of temperature and thermal damage to the tissue on the values of its thermophysical parameters was taken into account. The variable value of the perfusion coefficient affects the blood velocity in the capillary and thus the distribution of the partial oxygen pressure in the tissue. Various models of the oxygen dissociation curves were also considered and a sensitivity analysis was performed for the parameters of the oxygen distribution model. In the numerical realization stage, the finite difference method and the shooting method were used.
    Źródło:
    Engineering Transactions; 2023, 71, 3; 287-306
    0867-888X
    Pojawia się w:
    Engineering Transactions
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modeling of photochemical and photothermal effects in soft tissue subjected to laser irradiation
    Autorzy:
    Jasiński, Marek
    Zadoń, Maria
    Powiązania:
    https://bibliotekanauki.pl/articles/38706609.pdf
    Data publikacji:
    2024
    Wydawca:
    Instytut Podstawowych Problemów Techniki PAN
    Tematy:
    bioheat transfer
    optical diffusion equation
    photodynamic therapy
    boundary element method
    finite difference method
    transfer biociepła
    równanie dyfuzji optycznej
    terapia fotodynamiczna
    metoda elementów brzegowych
    metoda różnic skończonych
    Opis:
    The purpose of this study is to analyze the phenomena that occur in biological tissueduring photodynamic therapy (PDT). Under the influence of the laser, triplet oxygen istransformed into singlet oxygen, which is cytotoxic to cancer tissue. The impact of thelaser on the tissue may also be accompanied by changes in the thermophysical parameters,e.g., perfusion, which can affect the supply of oxygen to the tissue and, consequently,the outcome of the therapy. The proposed model uses the optical diffusion equation,the Pennes bioheat transfer equation, and reactions equations for PDT. The connectionbetween bioheat transfer and PDT models is taken into account through the respectiverelationships between perfusion rate, capillary blood velocity, and the maximum oxygensupply rate. Furthermore, a method is proposed to model abnormal vascular patterns inthe tumor subdomain. The boundary element method and the finite difference methodwere used in the numerical implementation stage.
    Źródło:
    Computer Assisted Methods in Engineering and Science; 2024, 31, 1; 29-50
    2299-3649
    Pojawia się w:
    Computer Assisted Methods in Engineering and Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mathematical modeling of the phenomena that occur in a biological tissue containing photosensitizer
    Autorzy:
    Jasiński, Marek
    Zadoń, Maria
    Powiązania:
    https://bibliotekanauki.pl/articles/2202041.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    bioheat transfer
    optical diffusion equation
    photodynamic therapy
    boundary element method
    finite difference method
    przepływ ciepła
    równanie dyfuzji optycznej
    terapia fotodynamiczna
    metoda elementów brzegowych
    metoda różnic skończonych
    Opis:
    The aim of the study is to analyze photothermal and photochemical phenomena that occur during photodynamic therapy (PDT). In this type of therapy, under the influence of the laser, reactions take place related to the transformation of triplet oxygen form into its singlet form which is cytotoxic to the tissue. The increases in temperature resulting from the laser-tissue interaction during PDT are not big; however, they can lead to changes in tissue perfusion, which can affect oxygen delivery to the tissue. The proposed model uses optical diffusion equation, Pennes bioheat transfer equation, and reactions equations for PDT. The main findings of the analysis show the impact of temperature on the value of the perfusion coefficient and triplet oxygen distributions at the end of the treatment procedure.
    Źródło:
    Journal of Applied Mathematics and Computational Mechanics; 2022, 21, 4; 40--51
    2299-9965
    Pojawia się w:
    Journal of Applied Mathematics and Computational Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Relics of Russian hunting stations on Dunöyane (West Spitsbergen)
    Autorzy:
    Chochorowski, Jan
    Jasiński, Marek E.
    Powiązania:
    https://bibliotekanauki.pl/articles/2052640.pdf
    Data publikacji:
    1995
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Arctic
    Spitsbergen
    archeology
    history
    Źródło:
    Polish Polar Research; 1995, 16, 3-4; 267-280
    0138-0338
    2081-8262
    Pojawia się w:
    Polish Polar Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of dissection on the mechanical properties of human ascending aorta and human ascending aorta aneurysm
    Autorzy:
    Kozuń, Marta
    Płonek, Tomasz
    Jasiński, Marek
    Filipiak, Jarosław
    Powiązania:
    https://bibliotekanauki.pl/articles/306886.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    tętniak
    rozwarstwienie
    aorta
    aneurysm
    dissection
    ascending aorta
    blood vessel wall
    Opis:
    The aim of the presented work is to determine (i) mechanical properties of the ascending aorta wall (DAA) and the wall of the ascending aortic aneurysm (DAAA), in which spontaneous dissection resulting from the evolving disease occurred, and (ii) the strength of the interface between the layers in the above-mentioned vessels. Methods: The mechanical tests were divided into two steps. In the first step the mechanical properties of the of DAA and DAAA walls were examined on the basis of uniaxial stretching until rapture. In the next step the mechanical parameters of the interface between layers of DAA and DAAA walls were determined by the peeling test. Results: Higher values of tensile strength (max) and Young’s modulus (E) were obtained for the DAAA group, to which the dissecting wall of the ascending aortic aneurysm was classified. For circumferential samples, the difference between the DAAA and DAA groups was 39% in the case of tensile strength and 70% in the case of the Young’s modulus. Conclusions: Summarizing, the studies performed showed that the dissection process is different in the case of the ascending aortic aneurysm wall and the ascending aorta wall. The wall of the ascending aortic aneurysm is more susceptible to dissection, as evidenced by lower values of the mechanical parameters of the interface between the intima and the media-adventitia complex. The obtained results of mechanical properties tests confirm that dissection and aneurysm should be treated as separate disease entities that may coexist with each other.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2019, 21, 2; 127-134
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Early Careers of Tertiary Graduates in Poland: Employability, Earnings, and Differences between Public and Private Higher Education
    Autorzy:
    Zając, Tomasz
    Jasiński, Mikołaj
    Bożykowski, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/1790712.pdf
    Data publikacji:
    2018-06-18
    Wydawca:
    Polskie Towarzystwo Socjologiczne
    Tematy:
    higher education
    labor market
    graduate tracking
    administrative data
    Polska
    Opis:
    Poland’s system of higher education has expanded rapidly in the last quarter century. Not all graduates of the massified educational system have succeeded in the labor market. Part of the public debate regarding the labor market performance of graduates focuses on the performance of graduates who attended private institutions and part-time programs. As yet, there has been no detailed research into the career paths of recent university graduates in Poland, let alone a comprehensive investigation of the differences between the performance of graduates of various types of studies. In this paper, we present the newly created Polish Graduate Tracking System. We use data from the system to evaluate the labor market performance of recent graduates and to demonstrate the differences between graduates of public and private education. Overall, the privately educated graduates fare better on the labor market, but a more in-depth analysis shows that this could be attributed to their strategy of early entry into the labor market.
    Źródło:
    Polish Sociological Review; 2018, 202, 2; 187-208
    1231-1413
    2657-4276
    Pojawia się w:
    Polish Sociological Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the Audibility of Electric Guitar Tonewood
    Autorzy:
    Jasiński, Jan
    Oleś, Stanisław
    Tokarczyk, Daniel
    Pluta, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/2097700.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    electric guitar
    tonewoods
    spectral analysis
    instrument timbre
    exotic woods
    guitar tone
    Opis:
    Electric guitar manufacturers have used tropical woods in guitar production for decades claiming it as beneficiary to the quality of the instruments. These claims have often been questioned by guitarists but now, with many voices raising concerns regarding the ecological sustainability of such practices, the topic becomes even more important. Efforts to find alternatives must begin with a greater understanding of how tonewood affects the timbre of an electric guitar. The presented study examined how the sound of a simplified electric guitar changes with the use of various wood species. Multiple sounds were recorded using a specially designed test setup and their analysis showed differences in both spectral envelope and the generated signal level. The differences between the acoustic characteristics of tones produced by the tonewood samples explored in the study were larger than the just noticeable differences reported for the respective characteristics in the literature. To verify these findings an informal listening test was conducted which showed that sounds produced with different tonewoods were distinguishable to the average listener.
    Źródło:
    Archives of Acoustics; 2021, 46, 4; 571-578
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Selected Aspects of 3D Printing for Emergency Replacement of Structural Elements
    Autorzy:
    Jasiński, Krzysztof
    Murawski, Lech
    Kluczyk, Marcin
    Muc, Adam
    Szeleziński, Adam
    Muchowski, Tomasz
    Chodnicki, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/2201888.pdf
    Data publikacji:
    2023
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    modal analysis
    cavity method
    additive method
    machine element repair
    Opis:
    The paper presents a synthetic characterization of modern methods of manufacturing or regenerating machine elements. Considered methods are machining and additive methods, in particular 3D printing in the FDM/FFF technique. For the study, the authors made samples of the holder bracket using selected methods. Samples made by machining operations, 3D printing with various filling were tested. The paper contains a technical and economic analysis of the production of a holder bracket using the discussed methods. The dynamics of steel and FDM/FFF printed samples were also assessed by determining their resonance curves. The vibration magnification fac-tors were analyzed - the quotient of the vibration amplitudes in the resonance to the static deformations that occurred under the influence of the constant force and the location of the vibration resonances - the natural frequencies for individual vibration modes. The study's main objective is to assess the possibility of emergency changing the manufacturing technology of selected machine components. The authors were interested in partially replacing costly and not environmentally friendly milling with 3D printing. Machine elements can be manufactured by printing in classical machine building and emergency conditions to replace a damaged component temporarily (e.g., on a ship, for the time of arrival at a port or shipyard). The main assumption guiding the authors during the preparation of this publication was the analysis of the possibility of using the production of "ad hoc" prepared spare parts and their use in the event of a lack of access to parts made of the intended materials.
    Źródło:
    Advances in Science and Technology. Research Journal; 2023, 17, 1; 274--289
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of Ignition Capability of Flammable Gases from Small Arms Propellant Gases
    Analiza możliwości zapłonu gazów łatwopalnych od gazów prochowych broni strzeleckiej
    Autorzy:
    Badurowicz, Przemysław
    Wiśniewski, Adam
    Pacek, Dawid
    Jasiński, Marcin
    Szczurowski, Krzysztof
    Woliński, Marek
    Bartkowiak, Tadeusz
    Powiązania:
    https://bibliotekanauki.pl/articles/2179955.pdf
    Data publikacji:
    2022
    Wydawca:
    Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
    Tematy:
    mechanics
    small arms
    transitional ballistics
    propellant gases
    thermal camera
    mechanika
    broń strzelecka
    balistyka przejściowa
    gazy prochowe
    kamera termalna
    Opis:
    The article presents the results of tests on the temperature of propellant gases shortly after the bullet leaves the barrel. The temperature and movement of these gases were recorded with thermal cameras and a high-speed camera. Weapons with and without muzzle devices (flash suppressor, silencer) were used. The aim of the research was to check the capability to ignite flammable gases located in the vicinity of the propellant gases produced during firing. Comparison of the maximum temperature of the propellant gases and the ignition temperature of the flammable gases makes it possible to determine the probability of fire. The lowest temperature of propellant gases was in the case of shooting with 9 × 19 mm bullets with the lowest kinetic energy (518 J), and the highest temperature of these gases was during shooting with 5.56 × 45 mm HC (SS109) bullets with the highest kinetic energy (1,785 J).
    W artykule przestawiono wyniki badań temperatury wylotowych gazów prochowych w krótkim okresie po opuszczeniu pocisku z lufy. Temperaturę i ruch tych gazów rejestrowano kamerami termalnymi i kamerą szybką. Użyto broni z urządzeniami wylotowymi (tłumik płomienia, tłumik dźwięku) oraz bez nich. Celem badań było sprawdzenie zdolności zapalenia gazów łatwopalnych znajdujących się w otoczeniu wylotowych gazów prochowych powstających w czasie strzału. Porównanie maksymalnej temperatury gazów prochowych i temperatury zapłonu gazów łatwopalnych umożliwia określenie prawdopodobieństwa powstania pożaru. Najniższa temperatura wylotowych gazów prochowych była w przypadku strzelania pociskami 9 × 19 mm o najniższej energii kinetycznej (518 J), a najwyższa temperatura tych gazów była podczas strzelania pociskami 5,56 × 45 mm HC (SS109) o najwyższej energii kinetycznej (1 785 J).
    Źródło:
    Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa; 2022, 13, 4 (50); 39--50
    2081-5891
    Pojawia się w:
    Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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