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    Wyświetlanie 1-9 z 9
    Tytuł:
    Estimation of solar radiation transmission for polycarbonate retractable swimming pool enclosures
    Autorzy:
    Zapałowicz, Zbigniew
    Garnysz-Rachtan, Agnieszka
    Powiązania:
    https://bibliotekanauki.pl/articles/1845493.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    outdoor swimming pool
    swimming pool roofing system
    pool enclosure
    polycarbonate enclosure
    solar transmission through enclosure
    Opis:
    Application of retractable enclosures enables to lengthen operation periods for outdoor swimming pools operated in the moderate climate zone. Enclosures allow to diminish energy losses from water in the pool to the environment. Thermal calculations for pools with retractable enclosures are difficult to carry out because of a number of required parameters which can only be estimated. One of them is the transmission of solar radiation through the enclosure. The present paper presents the method of estimation of this parameter for swimming pool enclosures made of polycarbonate panels that have multichannels structure. In order to calculate transmission, the methodology considering the multiples of solar reflection inside the enclosure and their absorption by polycarbonate has been elaborated. Calculation results for transmission of the enclosure were verified experimentally. Analysis of results show that the transmission depends strongly on the enclosure’s construction and on the direction of solar radiation on the enclosure. Mean transmission values of enclosure under research were determined both from calculations and experiment are equal to about 0.69 and 0.64, respectively. However, experimentally determined mean values of total transmission by parallel and perpendicular solar directions in relation to channel axes are equal to about 0.69 and 0.60, respectively.
    Źródło:
    Archives of Thermodynamics; 2021, 42, 1; 129-146
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of pressure on heat transfer during pool boiling of water-A1[2]0[3] and water-Cu nanofluids on stainless steel smooth tube
    Autorzy:
    Cieślinski, J.T.
    Kaczmarczyk, T.Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/185613.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    nanofluid
    ciśnienie robocze
    pool boiling
    operating pressure
    Opis:
    Experimental investigation of heat transfer during pool boiling of two nanofluids, i.e. water-Al203 and water-Cu has been carried out. Nanoparticles were tested at the concentration of 0.01%, 0.1%, and 1% by weight. The horizontal smooth stainless steel tubes having 10 mm OD and 0.6 mm wall thickness formed the test heater. The experiments have been performed to establish the influence of nanofluids concentration on heat transfer characteristics during boiling at different absolute operating pressure values, i.e. 200 kPa, ca. 100 kPa (atmospheric pressure) and 10 kPa. It was established that independent of nanoparticle materials (A1203 and Cu) and their concentration, an increase of operating pressure enhances heat transfer. Generally, independent of operating pressure, sub- and atmospheric pressure, and overpressure, an increase of nanoparticle concentration caused heat transfer augmentation.
    Źródło:
    Chemical and Process Engineering; 2011, 32, 4; 321-332
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zarządzanie miastem w chmurze – Cloud City
    Management of City „in Cloud”
    Autorzy:
    Wrana, Krzysztof
    Kmieć, Błażej
    Kmieć, Tadeusz
    Powiązania:
    https://bibliotekanauki.pl/articles/2028973.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Common pool resources
    intelligent cities
    open governance
    public participation
    Opis:
    Information society is characterized by self-organization and distributed information processing abilities. At the same time there is an increase in demand for participation in local decision processes. To meet these new expectations the authors present new, alternative framework for management of cities, in which local authorities are moderators, consultants and managers, whereas all stakeholders participate in decision making within purposely created networks and groups. In the article authors also indicate selected city infrastructure elements, which ownership and management could be transferred into “city cloud”.
    Źródło:
    Studia komitetu przestrzennego zagospodarowania kraju PAN; 2014, 157; 91-104
    0079-3507
    Pojawia się w:
    Studia komitetu przestrzennego zagospodarowania kraju PAN
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of heat transfer during pool boiling on minifins surface coated with carbon nanotubes
    Autorzy:
    Strąk, E.
    Pastuszko, R.
    Kłosowiak, R.
    Urbaniak, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/175588.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    pool boiling
    carbon nanotube
    heat transfer coefficient
    power
    electronic cooling
    Opis:
    The article describes the study of heat transfer during pool boiling on minifins surface coated with nanostructure. This is a molecular level technology used in engineering or mechanical factory. A surface with carbon nanotubes (CNTs) is highly effective in reducing the superheat incipience and enhancing both the heat flux and heat transfer coefficient. The paper focuses on the comparison of the surfaces, on which pool boiling heat transfer occurs, i.e., on minifins coated with carbon nanotubes (MF+N) with surfaces formed by sintering the woven copper wire mesh to the minifins tips (MF+M) and with plain minifins surface (MF). The experiments were carried out for two boiling fluids: water and ethyl alcohol. The purpose of the presented study was to find out which of those tested surfaces and fluids could be the best alternative for use in the cooling of electronic devices and which surfaces could be used as thermosyphon or heat pipe evaporator.
    Źródło:
    Transactions of the Institute of Fluid-Flow Machinery; 2015, 128; 59-72
    0079-3205
    Pojawia się w:
    Transactions of the Institute of Fluid-Flow Machinery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ethanol pool fire on a one-meter test tray – validation of CFD results
    Autorzy:
    Cherbański, Robert
    Rudniak, Leszek
    Machniewski, Piotr
    Molga, Eugeniusz
    Tępiński, Jarosław
    Klapsa, Wojciech
    Lesiak, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/2173418.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ogień w basenie
    etanol
    CFD
    SBES
    pool fire
    ethanol
    large-scale
    Opis:
    The ethanol fire hazards will become more frequent due to the new established targets for the consumption of renewable energy sources. With this in mind, this paper aims to widen the current knowledge on CFD modelling of such a fire. As previous works rely heavily on the data of small pool fire diameters (below 1 m), this research deals with ethanol pool fire on a one-meter test tray, using our own experimental data. A mathematical model was developed and solved using a commercial CFD package (ANSYS Fluent). A new hybrid RANS-LES (SBES) model was employed to calculate turbulent stresses. Generally, the simulation results showed a good fit with the experimental results for flame temperatures at different elevations. In particular, a minor discrepancy was only observed for the top thermocouple (1.9 m above the tray). The flame heights computed with the CFD model were on average higher than the experimental one. Good agreement was observed for the radiative fraction and the axial temperature profile on the plume centreline. The latter showed an almost perfect fit between the temperature profiles obtained from CFD simulations and those calculated from the plume law for temperature.
    Źródło:
    Chemical and Process Engineering; 2022, 43, 1; 23--44
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dobro wspólne okiem socjologa — kilka uwag porządkujących
    The Common Good in the Eye of the Sociologist—A Few Ordering Remarks
    Autorzy:
    Mika, Bartosz
    Powiązania:
    https://bibliotekanauki.pl/articles/1373002.pdf
    Data publikacji:
    2017-10-10
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    multitude
    socialization
    ownership
    common-pool resources
    wielość
    uspołecznienie
    własność
    dobra wspólnej puli
    Opis:
    This text can be defined as an attempt to look at the question of the common good through sociological glasses. The author suggests that many of the issues subsumed under  the term “the common good” have already been elucidated and described in detail on the basis of classical and contemporary sociology. If it is assumed that the common good can be understood triply, as (1) a postulate of the social good, (2) materially, as an object of collective ownership, and (3) as an effect of the individual’s life in society, then it must be admitted that, at least in the third case, reference to the collected achievements of sociology is necessary in order to describe the common good properly.
    Źródło:
    Kultura i Społeczeństwo; 2017, 61, 4; 49-63
    2300-195X
    Pojawia się w:
    Kultura i Społeczeństwo
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pool boiling of nanofluids on rough and porous coated tubes: experimental and correlation
    Autorzy:
    Cieśliński, J. T.
    Kaczmarczyk, T. Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/240179.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    pool boiling
    nanofluids
    correlation equation
    rough and porous coated tubes
    wrzenie w objętości
    nanopłyny
    równanie korelacyjne
    rury z powłoką porowatą
    Opis:
    The paper deals with pool boiling of water-Al2O3 and water-Cu nanofluids on rough and porous coated horizontal tubes. Commercially available stainless steel tubes having 10 mm outside diameter and 0.6 mm wall thickness were used to fabricate the test heater. The tube surface was roughed with emery paper 360 or polished with abrasive compound. Aluminium porous coatings of 0.15 mm thick with porosity of about 40% were produced by plasma spraying. The experiments were conducted under different absolute operating pressures, i.e., 200, 100, and 10 kPa. Nanoparticles were tested at the concentration of 0.01, 0.1, and 1% by weight. Ultrasonic vibration was used in order to stabilize the dispersion of the nanoparticles. It was observed that independent of operating pressure and roughness of the stainless steel tubes addition of even small amount of nanoparticles augments heat transfer in comparison to boiling of distilled water. Contrary to rough tubes boiling heat transfer coefficient of tested nanofluids on porous coated tubes was lower compared to that for distilled water while boiling on porous coated tubes. A correlation equation for prediction of the average heat transfer coefficient during boiling of nanofluids on smooth, rough and porous coated tubes is proposed. The correlation includes all tested variables in dimensionless form and is valid for low heat flux, i.e., below 100 kW/m2.
    Źródło:
    Archives of Thermodynamics; 2014, 35, 2; 3-20
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Instytucjonalna ciągłość i zmiana w społeczności lokalnej. Na przykładzie zarządzania wspólnymi zasobami w Jurgowie, wsi polskiego Spisza
    Institutional Continuity and Change in the Local Community. Example of Commons Governing in Jurgów, Village of Polish Spisz
    Autorzy:
    Chmielewski, Piotr
    Chmielewski, Jan
    Powiązania:
    https://bibliotekanauki.pl/articles/427916.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    instytucjonalni przedsiębiorcy
    dylematy społeczne
    działanie kolektywne
    struktura instytucjonalno-organizacyjna
    wspólne zasoby
    institutional entrepreneurs
    social dilemmas
    collective action
    institutional-organizational structure
    common-pool resources
    Opis:
    Artykuł analizuje ciągłość i zmianę reguł instytucjonalnych organizujących gospodarowanie wspólnymi leśnymi zasobami społeczności lokalnej Jurgowa, na polskim Spiszu. W wyniku zmiany część zasobów przyrodniczych wykorzystywanych zgodnie z tradycją została przekształcona w ośrodek sportów zimowych. Takie innowacyjne przedsięwzięcie wymagało nowych sposobów zbiorowego działania. Ważną rolę odegrali członkowie wspólnoty występujący w charakterze „okazjonalnych przywódców” i „instytucjonalnych przedsiębiorców”. Mieli oni ułatwione zadanie ze względu na tradycyjnie ugruntowane we wspólnocie sposoby rozwiązywania dylematów społecznych, wysoki poziom kapitału społecznego i zaufania wśród członków wspólnoty oraz spiskie zasoby kulturowe. Artykuł zwraca uwagę na potrzebę badania wspólnych zasobów w Polsce wskazując na fakt, iż ten aspekt różnorodności instytucjonalno-organizacyjnej i społeczno-kulturowej jest szczególnie ważny w obliczu zachodzących zmian. Tekst jest efektem badań jakościowych inspirowanych teoriami nowego instytucjonalizmu, w szczególności „Analizy Instytucjonalnej Rozwoju”.
    The article includes analysis of continuity and change of institutional rules applicable to governing the common-pool forest resources in possession of local community of Jurgów village, located within Polish Spisz. As a result of occurring change, traditionally exploited part of environmental resources was repositioned into modern winter sports resort. Such innovative adaptation required, and was challenged, by new collective action that was introduced by local society as common approach. It is such roles of local society members’ representatives, described as ‘occasional leaders’ and ‘institutional entrepreneurs’, that were taking major part in this complex process of transformation. Also noteworthy is that this task was to certain extent simplified by their traditionally rooted within local community resolving of social dilemmas skills, comparably high level of social capital, trust gained over the years among community members and cultural resources of Spisz area. The article directs readers attention towards need of Polish research on common pool resources, indicating that aspects of institutional-organizational structure, as well as, social-cultural diversity is particularly important in face of such changes taking place. This text was also result of qualitative research inspired by new institutionalism theories, in particular ‘Institutional Analysis and Development”.
    Źródło:
    Studia Socjologiczne; 2017, 3(226); 99-128
    0039-3371
    Pojawia się w:
    Studia Socjologiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Association between body iron stores and level of oxidatively modified DNA bases
    Autorzy:
    Dziaman, T.
    Jurgowiak, M.
    Olinski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/80695.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    atherosclerosis
    cancer
    cardiovascular disease
    cellular DNA
    free radical damage
    heterozygosity
    iron deficiency anaemia
    labile iron pool
    oxidative damage
    oxidative stress
    reactive oxygen species
    vascular disease
    Źródło:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2011, 92, 2
    0860-7796
    Pojawia się w:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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