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Wyszukujesz frazę "Śloderbach, Z." wg kryterium: Autor

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    Wyświetlanie 1-15 z 15
    Tytuł:
    The influence of thermomechanical coupling on the behaviour of athick-walled metallic tube subjected to internal pressure
    Autorzy:
    Śloderbach, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/264368.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    grubościenna rura
    naprężenia rzeczywiste
    naprężenia szczątkowe
    odkształcenia
    ciśnienie
    thick-walled tube
    thermomechanical coupling
    actual and residual stresses
    strain
    pressure
    Opis:
    In this study, the influence of thermomechanical coupling effect - the effect of thermal expansion due to dissipation of the energy of plastic deformation, with and without taking into account the stored energy of plastic deformation (SEPD) for the distribution of stresses, strains, temperature, the applied pressure and the residual stresses is examined. The residual stresses remain in a thick-walled tube (a cylindrical thick-walled tank) after removing the internal pressure in the process of purely elastic unloading. The analysis is made on the example of an analitycal solution for a thick-walled tube subjected to a quasistatically increasing internal pressure for the case of adiabatic processes (without heat flow). Since the loading with internal pressure is quasi-static (monotonic), then neglecting the process of heat flow can lead to some different results in calculated stresses, deformations, temperature, internal pressure and residual stresses. The calculations for isothermal type of processes of deformations (without heat or ideal cooling) are also performed for the estimation of these differences. The results calculated for the process with heat flow should be intermediate between the values obtained for isothermal and adiabatic processes.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2018, 23, 3; 751-766
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of two conditions of loss of stability in analysis of the tube bending process
    Autorzy:
    Śloderbach, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/265422.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    dopuszczalne naprężenia
    kąt zginania
    warstwa neutralna
    kolanko
    allowable strains and stresses
    bending angles
    neutral layer
    wall thickness of elbows
    Opis:
    In this paper, the derivation of expressions for admissible values of strains and stresses for vertex points of layers subjected to tension during tube bending at bending machines is presented. The conditions of the dispersed and located loss of stability of the bent tube were assumed as criteria of instability. The original element of this paper is the extension of the criterion of strain location in a form of possible initiation of a neck or furrow (introduced by Marciniak for thin plates [1]) to bending thin- and thick-walled metal tubes at bending machines. The conditions of the dispersed and localized loss of stability together with formation of the plane state of deformation (PSD) in the plane stress state (PSS) were assumed as the criteria of instability. The calculation results were presented as graphs being useful nomograms. We present also simple examples of calculations of permissible and critical strains and values of bending angles including and not including displacement of the neutral axis y0, during cold bending metal thin-walled tubes at bending machines for bending angles […].
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2019, 24, 4; 200-223
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Closed system of coupling effects in generalized thermo-elastoplasticity
    Autorzy:
    Śloderbach, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/266002.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    termodynamika
    sprzęgło
    naprężenia
    odkształcenia
    tworzywa sztuczne
    thermodynamic potentials
    couplings effects
    stresses
    deformations
    temperature
    entropy
    enthalpy
    constitutive and rate equations
    yield surface
    plastic potential
    Opis:
    In this paper, the field equations of the generalized coupled thermoplasticity theory are derived using the postulates of classical thermodynamics of irreversible processses. Using the Legendre transformations two new thermodynamics potentials P and S depending upon internal thermodynamic forces Π are introduced. The most general form for all the thermodynamics potentials are assumed instead of the usually used additive form. Due to this assumption, it is possible to describe all the effects of thermomechanical couples and also the elastic-plastic coupling effects observed in such materials as rocks, soils, concretes and in some metalic materials. In this paper not only the usual postulate of existence of a dissipation qupotential (the Gyarmati postulate) is used to derive the velocity equation. The plastic flow constitutive equations have the character of non-associated flow laws even when the Gyarmati postulate is assumed. In general formulation, the plastic strain rate tensor is normal to the surface of the generalized function of plastic flow defined in the the space of internal thermodynamic forces Π but is not normal to the yield surface. However, in general formulation and after the use the Gyarmati postulate, the direction of the sum of the plastic strain rate tensor and the coupled elastic strain rate tensor is normal to the yield surface.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2016, 21, 2; 461-483
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A derivation of the generalized model of strains during bending of metal tubes at bending machines
    Autorzy:
    Śloderbach, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/955183.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    zginanie
    rura metalowa
    giętarka
    bending
    metal tubes
    bending machine
    strains
    neutral axis
    Opis:
    According to the postulate concerning a local change of the “actual active radius” with a bending angle in the bend zone, a generalized model of strain during metal tube bending was derived. The tubes should be subjected to bending at tube bending machines by the method of wrapping at the rotating template and with the use of a lubricated steel mandrel. The model is represented by three components of strain in the analytic form, including displacement of the neutral axis. Generalization of the model during bending metal tubes at the tube bending machines as compared with the existing papers (Śloderbach, 1999; Śloderbach and Rechul, 2000) consists in including the neutral axis displacement and possibility of determination of strains at each point along the thickness of the wall of the bent tube in the bending and bend zone. The derived scheme of strain satisfies initial and boundary kinematic conditions of the bending process, conditions of continuity and inseparability of strains. The obtained analytic expressions can be classified as acceptable from the kinematic point of view.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2014, 19, 1; 145-163
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of the parameters of vibrations during dynamic balancing of the fan rotor according to Polish and International Standards
    Autorzy:
    Śloderbach, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/947331.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    parametry drgań
    wirnik wentylatora
    normy ISO
    wyważanie dynamiczne
    parameters of vibrations
    ISO standards
    fan rotor
    dynamic forces
    dynamic balancing
    Opis:
    In the paper a procedure and methodology of acceptable calculations of powers, displacements (of amplitudes) and velocities of pulses according to ISO standards depending on the rotational speeds (frequencies) of rotor during attempts of dynamic breaking down taking into account effectiveness of vibration isolation were described. The proposed method is regarding one-sidedly hung rotors appearing in such appliances as rotors of fans, blowers, pumps and others. As permissible parameters of pulses values which are given in international standards PN-ISO-10816-1:1998P and PN-ISO-7919-1:2001 were assumed. Calculations were compared in the form of tables and they depicted with relevant graphs which have the character of useful nomograms. Also, recommendations for the design of the foundations and guidelines related to dimensions of the foundation, the weight and the way of fixing the device were given. In the end also closing remarks and conclusions were given.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2019, 24, 2; 473-483
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Generalized model of strains during bending of metal tubes in bending machines
    Autorzy:
    Śloderbach, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/279709.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    tubes bending
    deformations
    bending angle
    thickness of the wall
    neutral axis
    Opis:
    According to the postulate concerning a local change of the “actual active radius” with a bending angle in the bent zone, a generalized model of strain during bending of ametal tube has been derived. The considered tubes should be subjected to bending in tube bending machines by the method of wrapping on a rotating template and with the use of a lubricated steel mandrel. The model is represented by three components of strain in the analytical form, including displacement of the neutral axis. Generalization of the model of metal tubes in the existing papers consists in including the displacement of the neutral axis and the possibility of determination of strains at each point along the thickness of the wall of the bent tube in the bending zone. The derived scheme of strain satisfies initial and boundary kinematic conditions of the bending process, conditions of continuity and inseparability of strains. The obtained analytical expressions can be classified as acceptable from the kinematic point of view.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2014, 52, 4; 1093-1106
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of strains and thicknesses of pipe elbows on the basis of expressions resulting from the EU-Directive for the case of large and small deformations
    Autorzy:
    Śloderbach, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/264378.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    EU Directive
    required thicknesses of pipe elbows
    pipe bending processes
    relative and logarithmic measures of deformation
    required initial thickness of a bent tube
    Dyrektywa UE
    kolanko rurowe
    rura
    Opis:
    The relations to calculate the maximum value of strains in processes of bending tubes on benders, in stretched layers of tubes, are presented in this work on the basis of the EU-Directive concerning production of pressure equipment. It has been shown that for large deformations that occur during bending of the pipes on knees, logarithmic strain measures (real) and relative strain measures give different values of strain but equal wall thicknesses in the bending zone. Logarithmic measures are frequently used in engineering practice and are valid for large and small deformations. Reverse expressions were also derived to calculate the required initial wall thickness of the tube to be bent, in order to obtain the desired wall thickness of the knee after bending.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2017, 22, 4; 1113-1127
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Derivation of relations and analysis of tube bending processes using discontinuous fields of plastic strains. Part I. Derivation of geometric-analytic relationships
    Autorzy:
    Śloderbach, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/264482.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    bending tubes
    three simplifications
    strains
    wall thickness
    discontinuous strain fields
    naprężenia
    kinematyka
    gięcie rur
    Opis:
    The generalized strain scheme in bending metal tubes at bending machines with the use of a mandrel presented in Śloderbach (1999; 2002; 20131,2; 2014) satisfies initial and boundary kinematic conditions of bending, conditions of continuity and inseparability of strains. This paper introduces three formal simplifications gradually imposed into forms of principal components of the generalized strain model giving suitable simplifications of the 1st, 2nd and 3rd types. Such mathematical simplifications cause that the obtained strain fields do not satisfy the condition of consistency of displacements and strain continuity. The simplified methods determine safer values of the wall thickness than those from the generalized continuous strain scheme. The condition of plastic incompressibility was used for the derivation of an expression for distribution of Wall thickness of the bent elbow in the layers subjected to tension and compression for three examples of discontinuous kinematic strain fields.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2015, 20, 2; 417-426
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Conditions of stability loss during the test of hydraulic forming of drawpieces. Part II. Discussion and analysis of the results
    Autorzy:
    Śloderbach, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/265430.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    hydraulic forming
    stability loss
    boundary strains
    height of the drawpiece
    normal and plane anisotropy
    odkształcenia plastyczne
    utrata stabilności
    wytłoczki
    Opis:
    This part of the paper contains the calculation results presented in the form of suitable diagrams and tables. The calculations were made according to the relationships obtained in Part I devoted to a laboratory test of hydraulic forming for some chosen engineering conditions of stability loss. The influence of the coefficient of material hardening, the coefficient of normal anisotropy and the coefficients of plane anisotropy on acceptable plastic strains and heights of the formed drawpieces corresponding to a given condition of stability loss was tested, too.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2015, 20, 4; 928-938
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the uniqueness conditions and bifurcation criteria in coupled thermo-elasto-plasticity
    Autorzy:
    Śloderbach, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/266253.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    bifurcation of the equilibrium state
    conditions and criteria of uniqueness
    boundary-value problem
    generalized coupled thermo-elasto-plasticity
    comparison bodies
    family of local conditions of uniqueness
    parameter of the optimization
    termoplastyczność
    elastoplastyczność
    odkształcenie plastyczne
    Opis:
    The global and local conditions of uniqueness and the criteria excluding a possibility of bifurcation of the equilibrium state for small strains are derived. The conditions and criteria are derived analyzing the problem of uniqueness of solution of the basic incremental boundary problem of coupled generalized thermo-elasto-plasticity. This paper is a continuation of some previous works by the author, but contains new derivation of the global and local criteria excluding a possibility of bifurcation of the equilibrium state for a comparison body dependent on statically admissible fields of stress velocity. All the thermal elastoplastic coupling effects, non-associated laws of plastic flow and influence of plastic strains on thermoplastic properties of a body were taken into account in this work. Thus, the mathematical problem considered here is not a self-conjugated problem. The paper contains four Appendices A, B, C and D where the local necessery and sufficient conditions of uniqueness have been derived.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2017, 22, 1; 199-227
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Conditions of stability loss during the test of hydraulic forming of drawpieces. Part I. Derivation of basic equations and relationships
    Autorzy:
    Śloderbach, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/955298.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    hydraulic forming
    stability loss
    boundary strains
    normal and plane anisotropy
    utrata stabilności
    wysokie wytłoczki
    odkształcenia plastyczne
    Opis:
    The paper contains two parts. In the first part, basic relationships were derived and some problems connected with stability loss during hydraulic forming of round metallic drawpieces with liquid pressure were discussed. The aim of the considerations is to test drawability of sheets by estimation of acceptable values of plastic strains and the corresponding heights of spherical shells. The analysis was based on some selected real conditions of stability loss. The influence of the coefficient of material hardening for the drawpiece, the coefficient of normal anisotropy and coefficients of plane anisotropy on acceptable values of plastic strains and heights of the formed drawpieces corresponding to the given condition of stability loss was also tested.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2015, 20, 4; 917-927
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Derivation of relations and analysis of tube bending processes using discontinuous fields of plastic strains. Part II. Discussion and analysis of the obtained results
    Autorzy:
    Śloderbach, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/955329.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    three simplifications
    strains
    wall thickness
    allovable strains and ovalization
    odkształcenia plastyczne
    gięcie rur
    naprężenia
    Opis:
    This paper presents the calculation results obtained on the basis of three formal simplifications (derived in Part I) gradually led into the main components of the generalized model of strain where suitable simplifications of the 1st, 2nd and 3rd type have been obtained. The paper also presents the results of considerations on the wall thickness distribution in the vertex point of the elongated layers of the bent elbow, and values of main components of the strain state and intensity of the strain (equivalent strain) depending on the bending angle for the generalized strain scheme and three simplified methods. The results are shown in the form of graphs and table.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2015, 20, 2; 427-435
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of strain hardening and normal anisotropy on admissible values of strain and stress in pipe-bending processes
    Autorzy:
    Śloderbach, Z.
    Rechul, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/279236.pdf
    Data publikacji:
    2000
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    plasticity of metals
    pipe bending
    deformational instability
    Opis:
    The paper aims at discussing the effect of hardening exponent and normal anisotropy index values on admissible values of bending angle and strain in cold bending of thin- and thick-walled steel pipes. A condition of distributed instability onset was adopted as a limiting criterion for the process. The analysis reveals that higher indexes of hardening and material anisotropy result in larger values of admissible strain and bending angle. The neutral axis position corresponding to the critical instability onset is shown to be shifted toward compressed layers of the pipe. The fracture problem associated with the bending process is presented.
    Wpływ umocnienia i anizotropii normalnej na dopuszczalne wartości odkształceń i naprężeń w procesie gięcia rur. W niniejszej pracy analizowano wpływ parametrów wzmocnienia i anizotropii normalnej materiału na dopuszczalne (krytyczne) wartości kąta giecia i wartości odkształcenia podczas gięcia na zimno cieńko- i grubościennych rur metalowych w zakresie kąta gięcia...[0-180]. Jako kryterium ograniczające proces gięcia przyjęto warunek rozproszonej utraty stateczności materiału dla przypadku jednoosiowego rozciągania i płaskiego stanu naprężenia. W pracy wykazano, że wzrost współczynników wzmocnienia i anizotropii normalnej zwiększa wartość dopuszczalnego odkształcenia zastępczego i kąta gięcia. W pracy obliczono także wartości przesunięcia osi obojętnej gięcia odpowiadające stanom rozproszonej utraty stateczności oraz wykazano, że przy założonych warunkach procesu gięcia jest to przesunięcie w kierunku warstw ściskanych łuku i którego wartość zwiększa się wraz ze wzrostem kąta gięcia. Rozpatrzono także proplem pękania w procesie gięcia rur,w którym czynnikiem oceny jest wskaźnik techniczny plastyczności A5.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2000, 38, 4; 843-859
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stored energy of plastic deformation in tube bending processes
    Autorzy:
    Śloderbach, Z.
    Pająk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/264871.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    odkształcenia plastyczne
    gięcie rur
    energia zmagazynowana
    stal austenityczna
    kocioł stalowy
    plastic deformation
    tube bending
    stored energy
    austenitic steel
    boiler steel
    Opis:
    The paper presents an aproximate analytic method for determination of the stored energy of plastic deformation during cold bending of metal tubes at bending machines. Calculations were performed for outer points of the tube layers subjected to tension and compression (the points of maximum strains). The percentage of stored energy related to the plastic strain work was determined and the results were presented in graphs. The influence and importance of the stored energy of plastic deformation on the service life of pipeline bends are discussed.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2013, 18, 1; 235-248
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of Ranges of Components of Heat Affected Zone Including Changes of Structure
    Określenie zakresów składowych strefy wpływu ciepła uwzględniając zmiany struktury
    Autorzy:
    Śloderbach, Z.
    Pająk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/353514.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    welding
    heat-affected zone
    weld
    length of components of HAZ
    pipelines
    spawanie
    strefy wpływu ciepła
    spoina
    HAZ
    rurociągi
    Opis:
    A simplified analytical method to determine the range of the heat affected zone and its components during welding is presented. Heat affected zone (HAZ) is an area formed during welding in which, as the result of temperature, some structural changes in the welded material occured. Knowledge of the area and sub-areas of HA Z is important from practical point of view, since the area of the fine-grained HAZ is a critical place in terms of creep strength and thermal fatigue. Heat affected zone is often the cause of future damage of many devices in which welding technology was used for their repair.
    Przedstawiono uproszczoną analityczną metodę służącą do określenia zakresu wpływu strefy ciepła i zakresów jej stref składowych podczas spawania. Obszar (strefa) wpływu ciepła (HA Z) to obszar, w którym podczas procesu spawania w wyniku działania wysokiej temperatury zaszły strukturalne zmiany w spawanym materiale. Wiedza na temat obszaru i podobszarów HA Z jest ważna z praktycznego punktu widzenia, ponieważ np. strefa drobno-ziarnistego HA Z jest krytycznym obszarem wytrzymałości na pełzanie oraz zmęczenia cieplnego. HA Z (strefa wpływu ciepła) jest często miejscem i przyczyną późniejszego uszkodzenia wielu urządzeń, które naprawiano techniką spawania.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 4; 2607-2612
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-15 z 15

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