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Tytuł:
Porównanie modelowania MES z wykorzystaniem elementów bryłowych i osiowosymetrycznych na przykładzie zamykania nitu na prasie
Comparison of FEM modelling techniques with solid and axisymmetric elements on example of press riveting simulation
Autorzy:
Gadalińska, E.
Kaniowski, J.
Wronicz, W.
Powiązania:
https://bibliotekanauki.pl/articles/211232.pdf
Data publikacji:
2010
Wydawca:
Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:
zamykanie nitu
MES (metoda elementów skończonych)
modele bryłowe i osiowosymetryczne
dyfraktometria rentgenowska
naprężenia własne
riveting process
FEM
solid and axisymmetric models
X-ray diffractometry
residual stresses
Opis:
W pracy porównano dwa sposoby modelowania zamykania nitu na prasie: z wykorzystaniem elementów bryłowych oraz osiowosymetrycznych. Celem pracy jest określenie, jaki jest wpływ ww. sposobów modelowania na wyniki oraz jakie posiadają one wady i zalety. Analizowano modele używane podczas aktualnie prowadzonych prac. Analizowano modele z różną gęstością siatki, przy czym dla danej gęstości siatka w modelu osiowosymetrycznym odpowiada siatce w przekroju modelu bryłowego, w płaszczyznach symetrii. Uwzględniono nieliniowe własności materiałów oraz zjawiska kontaktowe. Obliczenia prowadzono przy użyciu oprogramowania MSC MARC. Porównano uzyskane wyniki oraz czasy obliczeń dla poszczególnych modeli i wielkość plików wynikowych. Wyniki obliczeń porównano z wynikami pomiaru naprężeń wokół nitu metodą dyfrakcji rentgenowskiej.
The paper presents comparison of FEM modelling of press riveting with solid and axisymmetric elements. The aim of the work was to determine the influence of mentioned techniques on results as well as their advantages and disadvantages. Models used in current works were analysed. Models with different mesh density were studied. For particular density, the mesh in the axisymmetric model corresponds to the mesh in a cross section of the solid model in its symmetry plane. Nonlinear material properties were taken into account as well as contact phenomena. Calculations were performed with the MSC MARC software. Results obtained for various models were compared as well as time of calculations and size of result files. Results of FEM calculations were compared with x-ray diffractometry measurements around rivets.
Źródło:
Biuletyn Wojskowej Akademii Technicznej; 2010, 59, 4; 379-398
1234-5865
Pojawia się w:
Biuletyn Wojskowej Akademii Technicznej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Random Vortex Method approach to axisymmetric jet in a large tank
Autorzy:
Hedar, I.M.
Styczek, A.
Powiązania:
https://bibliotekanauki.pl/articles/279559.pdf
Data publikacji:
1999
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
viscous jet flow
stochastic method
axisymmetric vortex blob
Opis:
In the paper we give an extention of the Vortex Blob Method to cover axisymmetric flows of of viscous liquid. We also present a simple simulation of a jet flowing into a half-space large tank. This example shows that the method works and that a more reliable numerical simulation can be performed.
W pracy podano rozszerzenie metody "Vortex Blob" na ruch osiowosymetryczny i przedstawiono symulację strugi płynu lepkiego wpływającego do półograniczonego obszaru. Przykład pokazuje możliwości, choć nie jest wyliczony perfekcyjnie.
Źródło:
Journal of Theoretical and Applied Mechanics; 1999, 4; 863-872
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stress-strain state simulation of non-uniformly heated elements of components and assemblies of automotive
Autorzy:
Hrevtsev, O.
Selivanova, N.
Popovych, P.
Poberezhny, L.
Brych, V. Ya.
Rudyak, Yu.
Shevchuk, O.
Bakulina, N.
Rozum, R.
Buriak, M.
Powiązania:
https://bibliotekanauki.pl/articles/2201070.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
mathematical model
elasticity theory
axisymmetric problems
critical infrastructure
metal structures
stress-strain state
displacement functions
thermal deformation
thermodynamically inverse process
cylinder
finite length
thickness
model matematyczny
teoria sprężystości
symetria osiowa
infrastruktura krytyczna
konstrukcje metalowe
stan naprężeń i odkształceń
odkształcenie termiczne
proces termodynamiczny
proces odwracalny
skończona długość
grubość
Opis:
Purpose Develop a method for determining and evaluating the stress-strain state, particularly the distribution of thermomechanical stresses in the materials of individual rotating parts of vehicles. Design/methodology/approach The proposed method is based on the principle of gradual approximations of the solution when the boundary conditions are satisfied on the curvilinear limiting surfaces of the disk body. Findings The proposed method of determining and estimating the distribution of thermomechanical stresses in the disk material makes it possible to take into account the variable geometry: thickness and presence of a hole in the central part of the disk, also correctly determine stress-strain state at any point of unevenly heated rotating axial body. Research limitations/implications The work uses generally accepted assumptions and limitations for thermomechanical calculations. Originality/value It is proved that in real disks, the stress-strain state is spatial, and the well - known method based on the hypotheses of the plane-stress state does not provide the possibility of calculating the values of stresses in the thickness of the disk. The obtained results can be used to improve the methodology of auto technical examination of road accidents. In addition, they can be taken into account by bus drivers on urban routes when choosing a safe distance in heavy traffic, as well as design engineers of car brake systems.
Źródło:
Journal of Achievements in Materials and Manufacturing Engineering; 2022, 115, 1; 26--32
1734-8412
Pojawia się w:
Journal of Achievements in Materials and Manufacturing Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Solving the problem of elasticity for round thick plates at axially symmetric strain
Autorzy:
Hvertsev, O.
Selivanova, N.
Powiązania:
https://bibliotekanauki.pl/articles/2140678.pdf
Data publikacji:
2016
Wydawca:
Fundacja Centrum Badań Socjologicznych
Tematy:
theory of elasticity
axisymmetric function movement
temperature change
thermodynamically reversible (inverse) process
bending round plate
Opis:
An exact solution of the equations of elasticity for round plates loaded axially symmetric. The problem of bending round plates, which are under the influence of normal forces attached to any law to load any type of resistance. It is shown that pasture circular plate under axially symmetric load leads to appearance of temperature field.
Źródło:
Journal of Sustainable Development of Transport and Logistics; 2016, 1, 1; 40-48
2520-2979
Pojawia się w:
Journal of Sustainable Development of Transport and Logistics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Axisymmetric free vibration of layered cylindrical shell filled with fluid
Autorzy:
Izyan, M. D. Nurul
Sabri, Nur Ain Ayunni
Hafizah, A. K. Nor
Sankar, D. S.
Viswanathan, K. K.
Powiązania:
https://bibliotekanauki.pl/articles/2106463.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
drgania swobodne
powłoka cylindryczna
efekt Love'a
axisymmetric
free vibration
cylindrical shell
Love’s first approximation theory
inviscid fluid
spline approximation
eigenvalues
Opis:
The aim of the study is to analyse the axisymmetric free vibration of layered cylindrical shells filled with a quiescent fluid. The fluid is assumed to be incompressible and inviscid. The equations of axisymmetric vibrations of layered cylindrical shell filled with fluid, on the longitudinal and transverse displacement components are obtained using Love’s first approximation theory. The solutions of displacement functions are assumed in a separable form to obtain a system of coupled differential equations in terms of displacement functions. The displacement functions are approximated by Bickley-type splines. A generalized eigenvalue problem is obtained and solved numerically for a frequency parameter and an associated eigenvector of spline coefficients. Two layered shells with three different types of materials under clamped-clamped boundary conditions are considered. Parametric studies are made on the variation of the frequency parameter with respect to length-to-radius ratio and length-to-thickness ratio.
Źródło:
International Journal of Applied Mechanics and Engineering; 2021, 26, 4; 63--76
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental verification of theoretical calculations of the natural frequencies of axisymmetric vibrations of thin circular plates clamped at the edge
Weryfikacja doświadczalna obliczeń teoretycznych częstości własnych drgań osiowosymetrycznych cienkich płyt kołowych utwierdzonych na obwodzie
Autorzy:
Jaroszewicz, J.
Powiązania:
https://bibliotekanauki.pl/articles/271250.pdf
Data publikacji:
2017
Wydawca:
Centralny Ośrodek Badawczo-Rozwojowy Aparatury Badawczej i Dydaktycznej, COBRABiD
Tematy:
eksperyment
drgania osiowo symetryczne
płyta kołowa
experimental
axisymmetric vibrations
circular plates
Opis:
The paper presents an overview of methods of measuring the frequency of vibration. Harmonic or random excitations are commonly used methods for this purpose. The classic method of harmonic excitation involves the use of sinusoidally variable, frequency-modulated excitation. In the case of study of structural dynamics, a special significance deserves to be attached to the shock pulse method (SPM), in which short shocks function as a way of excitation of vibration, and the fact that this method does not require the use of complex measurement systems is one of its obvious advantages. The paper demonstrates that when measuring frequency of vibrations of thin plates and membranes with piezoelectric sensors, disregarding the influence of their weight, which may comprise from 0.05 to 0.03 in relation of weight of the plate, may result in considerable errors in the method, in the range of 5-10%. In such cases, negative approximations should be considered whose values in this study were calculated using analytical method of influence function and a numerical method of finite elements (FEM).
W pracy przedstawiono przegląd metod pomiaru częstości drgań. Powszechnie stosuje się metody wymuszenia harmonicznego lub losowego. Klasyczna metoda wymuszenia harmonicznego polega na stosowaniu sinusoidalnie zmiennego wymuszenia z modulowaną częstotliwością. W przypadku badania dynamiki konstrukcji na szczególną uwagę zasługuje metoda impulsowa, w której jako wymuszenie drgań stosuje się krótkotrwały udar. Jej niewątpliwą zaletą jest to, że nie wymaga ona stosowania złożonych układów pomiarowych. Uzasadniono, że w przypadku pomiaru częstości drgań cienkich płyt i membran czujnikami piezoelektrycznymi nieuwzględnienie wpływu ich masy, która może stanowić od 0,05 do 0,03 w stosunku do masy płyty, prowadzi do znacznych błędów metody, w granicach 5-10%. W takich przypadkach należy uwzględnić poprawki ujemne, które w niniejszej pracy zostały obliczone metodą analityczną funkcji wpływu oraz numeryczną elementów skończonych.
Źródło:
Aparatura Badawcza i Dydaktyczna; 2017, 22, 1; 4-11
2392-1765
Pojawia się w:
Aparatura Badawcza i Dydaktyczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An experimental and numerical study of supercavitating flows around axisymmetric cavitators
Autorzy:
Javadpour, S. M.
Farahat, S.
Ajam, H.
Salari, M.
Nezhad, A. H.
Powiązania:
https://bibliotekanauki.pl/articles/949307.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
natural cavitation
mass transfer
water tunnel
finite element method
drag coefficient
axisymmetric cavitators
Opis:
It has been shown that developing a supercavitating flow around under-water projectiles has a significant effect on their drag reduction. As such, it has been a subject of growing attention in the recent decades. In this paper, a numerical and experimental study of supercavitating flows around axisymmetric cavitators is presented. The experiments are conducted in a semi-open loop water tunnel. According to the Reynolds-Averaged Navier-Stokes equations and mass transfer model, a three-component cavitation model is proposed to simulate the cavitating flow. The corresponding governing equations are solved using the finite element method and the mixture Rayleigh-Plesset model. The main objective of this research is to study the effects of some important parameters of these flows such as the cavitation number, Reynolds number and conic angle of the cavitators on the drag coefficient as well as the dimensions of cavities developed around the submerged bodies. A comparison of the numerical and experimental results shows that the numerical method is able to predict accurately the shape parameters of the natural cavitation phenomena such as cavity length, cavity diameter and cavity shape. The results also indicate that the cavitation number declines from 0.32 to 0.25 leading to a 28 percent decrease in the drag coefficient for a 30° cone cavitator. By increasing the Reynolds number, the cavity length is extended up to 322% for a 60° cone cavitator.
Źródło:
Journal of Theoretical and Applied Mechanics; 2016, 54, 3; 795-810
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical analysis of a velocity distribution of a fluid flow inside a reversing chamber
Autorzy:
Judt, W.
Bartoszewicz, J.
Powiązania:
https://bibliotekanauki.pl/articles/242487.pdf
Data publikacji:
2018
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
numerical analysis
reversing flow
fluent
axisymmetric flow
Opis:
Axisymmetric stream, which is directed into an obstacle, is an important type of a fluid flow for technical applications in a large amount of thermal and flow devices. The article presents a case wherein stream of a fluid is directed into a flat surface and changes the direction of a flow by an angle equal to 90°. After that, the free stream is changing a character of a flow into impinging stream. The article presents a methodology of numerical calculations preparation in ANSYS Fluent environment for a velocity distribution of an airflow inside a reversing chamber. Numerical calculations were prepared for a three-dimensional model as an unsteady simulation with Delayed Detached Eddy Simulation model of turbulence. A stream of an air, which was analysed inside a reversing chamber, was not initially swirled. Obtained results of realized calculations were compared with experimental analysis and numerical calculations, which was realized in a different environment by co-author. Model of reversing chamber, which was implemented into numerical analysis has the same dimensions as used in experimental research. Obtained results show areas of intense flow turbulence inside reversing chamber. Prepared numerical calculations agreed with experimental results of research and allowed to designate areas of stream core and impinging stream inside modelled chamber.
Źródło:
Journal of KONES; 2018, 25, 3; 247-251
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Entropy generation on mhd flow of Powell-Eyring fluid between radially stretching rotating disk with diffusion-thermo and thermo-diffusion effects
Autorzy:
Khan, N. A.
Aziz, S.
Ullah, S.
Powiązania:
https://bibliotekanauki.pl/articles/386796.pdf
Data publikacji:
2017
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
axisymmetric flow
entropy generation
stretching disk
Powell-Eyring fluid
diffusion
Opis:
An investigation is performed for an alyzing the effect of entropy generation on the steady, laminar, axisymmetric flow of an incompressible Powell-Eyring fluid. The flow is considered in the presence of vertically applied magnetic field between radially stretching rotating disks. The Energy and concentration equation is taking into account to investigate the heat dissipation, Soret, Dufour and Joule heating effects. To describe the considered flow non-dimensionalized equations, an exact similarity function is used to reduce a set of the partial differential equation into a system of non-linear coupled ordinary differential equation with the associated boundary conditions. Using homotopy analysis method (HAM), an analytic solution for velocity, temperature and concentration profiles are obtained over the entire range of the imperative parameters. The velocity components, concentration and temperature field are used to determine the entropy generation. Plots illustrate important results on the effect of physical flow parameters. Results obtained by means of HAM are then compared with the results obtained by using optimized homotopy analysis method (OHAM). They are in very good agreement.
Źródło:
Acta Mechanica et Automatica; 2017, 11, 1; 20-32
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Generation of surface waves due to initial axisymmetric surface disturbance in water with a porous bottom
Autorzy:
Kundu, P.
Mandal, B. N.
Powiązania:
https://bibliotekanauki.pl/articles/265312.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
transformata Laplace'a
powierzchnia porowata
transformata Henkel'a
axisymmetric surface disturbance
porous bottom
Laplace and Hankel transform
method of stationary phase
free surface depression
Opis:
A two-dimensional Cauchy Poisson problem for water with a porous bottom generated by an axisymmetric initial surface disturbance is investigated here. The problem is formulated as an initial value problem for the velocity potential describing the motion in the fluid. The Laplace and Hankel transform techniques have been used in the mathematical analysis to obtain the form of the free surface in terms of a multiple infinite integral. This integral is then evaluated asymptotically by the method of stationary phase. The asymptotic form of the free surface is depicted graphically in a number of figures for different values of the porosity parameter and for different types of initial disturbances.
Źródło:
International Journal of Applied Mechanics and Engineering; 2019, 24, 3; 625-644
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Strength statistical characteristics of the isotropic materials with disc-shaped defects
Autorzy:
Kvit, R.
Powiązania:
https://bibliotekanauki.pl/articles/122597.pdf
Data publikacji:
2018
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
isotropic material
disc-shaped crack
distribution law
failure loading
strength statistical characteristics
axisymmetric loading
materiał izotropowy
wytrzymałość materiałów
charakterystyka statystyczna
pęknięcie
Opis:
The expressions of the probabilities density distribution of failure loading for an elastic isotropic body under the action of a homogeneous axisymmetric loading are written. The disc-shaped cracks that do not interact with each other are uniformly distributed. The correlation for finding the most probable, mean value, dispersion and variation coefficient of failure loading are obtained. The dependence of the mentioned statistical strength characteristics on the type of applied loading, number of defects (body sizes) and structure material heterogeneity are investigated.
Źródło:
Journal of Applied Mathematics and Computational Mechanics; 2018, 17, 4; 25-34
2299-9965
Pojawia się w:
Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of probabilistic aspects reliability of isotropic bodies with internal defects
Autorzy:
Kvit, Roman
Powiązania:
https://bibliotekanauki.pl/articles/2202039.pdf
Data publikacji:
2022
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
fracture
reliability
distribution law
axisymmetric loading
disc-shaped crack
isotropic material
pękanie
niezawodność
obciążenie osiowosymetryczne
materiał izotropowy
Opis:
A study of the stress state and reliability of an isotropic body with the same material crack resistance and evenly distributed internal defects-cracks under the conditions of homogeneous axisymmetric loading is carried out. Defects are characterized by two independent random variables – a radius and orientation angle. The probability density distribution of the defect radius is chosen in the form of an exponential law. The probability density distribution of the defect orientation angle is chosen in the form of a law that corresponds to the material isotropy. The influence of the loading level, type of stress state and body size (number of defects) on the most probable value, the mean value and the dispersion of failure loading (strength) are investigated.
Źródło:
Journal of Applied Mathematics and Computational Mechanics; 2022, 21, 3; 73--84
2299-9965
Pojawia się w:
Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Axisymmetric Torsion of an Elastic Layer Sandwiched between Two Elastic Half-Spaces with Two Interfaced Cracks
Autorzy:
Madani, Fateh
Kebli, Belkacem
Powiązania:
https://bibliotekanauki.pl/articles/178508.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
axisymmetric torsion
penny-shaped crack
dual integral equations
Fredholm integral equations
Opis:
The present article examines the problem related to the axisymmetric torsion of an elastic layer by a circular rigid disc at the symmetry plane. The layer is sandwiched between two similar elastic half-spaces with two penny-shaped cracks symmetrically located at the interfaces between the two bonded dissimilar media. The mixed boundary-value problem is transformed, by means of the Hankel integral transformation, to dual integral equations, that are reduced, to a Fredholm integral equation of the second kind. The numerical methods are used to convert the resulting system to a system of infinite algebraic equations. Some physical quantities such as the stress intensity factor and the moment are calculated and presented numerically according to some relevant parameters. The numerical results show that the discontinuities around the crack and the inclusion cause a large increase in the stresses that decay with distance from the disc-loaded. Furthermore, the dependence of the stress intensity factor on the disc size, the distance between the crack and the disc, and the shear parameter is also observerd.
Źródło:
Studia Geotechnica et Mechanica; 2019, 41, 2; 57-66
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Three-dimensional MHD boundary layer flow due to an axisymmetric shrinking sheet with radiation, viscous dissipation and heat source/sink
Autorzy:
Madhu, M.
Balaswamy, B.
Kishan, N.
Powiązania:
https://bibliotekanauki.pl/articles/265263.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
promieniowanie
lepki płyn
przenoszenie ciepła
axisymmetric shrinking sheet
dual solution
radiation
viscous dissipation
FEM
Opis:
An analysis is made to study a three dimensional MHD boundary layer flow and heat transfer due to a porous axisymmetric shrinking sheet. The governing partial differential equations of momentum and energy are transformed into self similar non-linear ordinary differential equations by using the suitable similarity transformations. These equations are, then solved by using the variational finite element method. The flow phenomena is characterised by the magnetic parameter M, suction parameter S, porosity parameter Kp, heat source/sink parameter Q, Prandtl number Pr, Eckert number Ec and radiation parameter Rd. The numerical results of the velocity and temperature profiles are obtained and displayed graphically.
Źródło:
International Journal of Applied Mechanics and Engineering; 2016, 21, 2; 393-406
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bending of a generalized circular sandwich plate under a concentrated force with consideration of an improved shear deformation theory
Autorzy:
Magnucki, K.
Magnucka-Blandzi, E.
Wittenbeck, L.
Powiązania:
https://bibliotekanauki.pl/articles/38695688.pdf
Data publikacji:
2022
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
circular sandwich plate
shear deformation theory
axisymmetric bending
Opis:
The paper is devoted to an axisymmetric bending problem of a generalized circular sandwich plate with continuous variation of mechanical properties in the thickness direction of the core. The plate is clamped and carries a concentrated force in its center. The improved shear deformation theory of the normal straight line to the neutral surface is elaborated. The deformation of this normal straight line is graphically presented for the exemplary sandwich structures of the plate. Two differential equation of equilibrium of the plate are obtained based on the principle of stationary potential energy. This system of equations is analytically solved and the maximum deflection of the example plates are derived. Moreover, the deformation of the normal strain line and the maximum deflection of the plate are calculated numerically (FEM). Results of these calculations are compared.
Źródło:
Archives of Mechanics; 2022, 74, 4; 267-282
0373-2029
Pojawia się w:
Archives of Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
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