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    Wyświetlanie 1-12 z 12
    Tytuł:
    Digital Material Representation Model of Porous Microstructure Based on 3D Reconstruction Algorithm
    Autorzy:
    Madej, Ł.
    Mojżeszko, M.
    Chrapoński, J.
    Roskosz, S.
    Cwajna, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/356105.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    3D reconstruction
    digital material representation
    serial sectioning
    porous microstructure
    finite element method
    Opis:
    Development of the Digital Material Representation (DMR) model, based on 3D reconstruction algorithm and serial sectioning, is the main goal of the present paper. Details on the serial sectioning and image processing algorithms are presented first. Serial sectioning is realized on the basis of light microscopy (LM). Then concept of 3D reconstruction and developed algorithms are presented. Two approaches, based on shape coefficients and the flood fill algorithms, are developed to identify corresponding features on subsequent 2D images. Then, the interpolation algorithm to reconstruct 3D volume between 2D images is presented. Finally, obtained 3D model is an input for finite element mesh generation software for subsequent finite element calculations.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 2A; 563-569
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical modeling of porous ceramics microstructure
    Autorzy:
    Miedzińska, Danuta
    Powiązania:
    https://bibliotekanauki.pl/articles/298116.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie
    Tematy:
    porous ceramics
    finite element method
    microstructure
    Opis:
    The presented research is directed to the porous ceramics microstructural behaviour assessment with the use of numerical methods. Such new material can be used for thermal insulation, filters, bio-scaffolds for tissue engineering, and preforms for composite fabrication. One of the newest and most interesting applications, considered in this work, is a usage of those materials for production of proppants for hydraulic fracturing of shale rocks. The hydraulic fracturing is a method of gas recovery from unconventional reservoirs. A large amount of fracturing fluid mixed with proppant (small particles of sand or ceramics) is pumped into the wellbore and its pressure causes the rock cracking and gas release. After fracturing the fluid is removed from the developed cracks leaving the proppant supporting the fracture. In the paper the grain porous ceramics which is used for proppant particles preparation was studied. The influence of grains distribution on the porous ceramics mechanical behaviour during compression was simulated with the use of finite element method.
    Źródło:
    Technical Sciences / University of Warmia and Mazury in Olsztyn; 2019, 22(1); 5-17
    1505-4675
    2083-4527
    Pojawia się w:
    Technical Sciences / University of Warmia and Mazury in Olsztyn
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Badania mikrostruktury porowatych pokryć modelowych implantów dokostnych
    Experimental investigations of porous coatings microstructure of model endoosseous implants
    Autorzy:
    Uklejewski, R.
    Winiecki, M.
    Rogala, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/284916.pdf
    Data publikacji:
    2009
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Tematy:
    mikrostruktura
    implanty
    porowate pokrycia
    microstructure
    implants
    porous coatings
    Źródło:
    Engineering of Biomaterials; 2009, 12, no. 89-91; 113-115
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electrochemical Formation and Microstructure of Porous Gallium Phosphide
    Autorzy:
    Treideris, M.
    Simkiene, I.
    Selskis, A.
    Balevicius, Z.
    Babonas, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1505468.pdf
    Data publikacji:
    2011-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    82.45.Yz
    81.07.Bc
    61.46.-w
    78.40.Pg
    Opis:
    Electrochemical formation and microstructure of porous GaP have been investigated. Nanostructured porous GaP layers of thickness up to ≈ 20 μm were fabricated on n-type (111)-oriented crystalline c-GaP substrates. Studies of microstructure of porous GaP in dependence on electrolyte type and regimes of technological procedure have been carried out by scanning electron microscopy. The samples were characterized by spectroscopic ellipsometry in visible and near UV spectral range. The investigations have shown that the structure and optical response of porous GaP can be efficiently controlled by technological procedure of electrochemical formation. The shape and dimension of pores can be varied from nanometer-scaled cylindrical pores to GaP nanorods.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 2; 131-134
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructure of porous space in cement sheath used for sealing oil wells
    Autorzy:
    Kremieniewski, M.
    Rzepka, M.
    Stryczek, S.
    Wiśniowski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/298870.pdf
    Data publikacji:
    2018
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    cement slurry
    drilling
    oil wells
    Opis:
    The effect of cement slurry modification on the microstructure of the annular space in a wellbore is presented in this paper. An admixture of macromolecular copolymer GS was used, which is usually applied in cement slurry technology to counteract gas migration by the binding cement slurry. The copolymer addition also results in sealing up the cement matrix at the stage of the binding and formation of hardened cement slurry. The modification of a slurry composition with this admixture results in the fact that the cement matrix has low porosity and is strongly compact. Consequently, a significantly higher number of micropores with small diameters are formed than those with larger micropores in the analyzed hardened cement slurry sample. An admixture of a macromolecular copolymer (7 wt.% of the cement) was added and 10% of the latex was removed from the recipe to show the influence of the modified recipe on the microstructure of the cement sheath. Thanks to this modification, the microcement participation could be reduced by 50% with the simultaneously improved quality of the most important technological parameters of fresh and hardened cement slurry. The basic and modified recipes were analyzed. The following parameters of the slurry were determined: rheology, filtration, water settlement, and time of densification. The influence of the modified slurry on the parameters describing the microstructure of the hardened slurry was analyzed for the hardened slurry (i.e., porosimetric porosity and microtomographic porosity). The microstructure of a sample fracture was also investigated. The analyses were conducted for recipes of slurries to be used for sealing wells at a temperature of 40°C and pressure of 10 MPa.
    Źródło:
    AGH Drilling, Oil, Gas; 2018, 35, 3; 433-442
    2299-4157
    2300-7052
    Pojawia się w:
    AGH Drilling, Oil, Gas
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analiza mikrostruktury warstw porowatych nanoszonych w procesie mikrospawania
    Analysis of microstructure of porous layers obtained using microwelding process
    Autorzy:
    Depczyński, W.
    Spadło, S.
    Ziach, E.
    Młynarczyk, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/251135.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Naukowo-Wydawniczy TTS
    Tematy:
    mikrostruktura warstw porowatych
    mikrospawanie
    porous layers formation process
    microwelding
    Opis:
    Celem pracy było przeprowadzone badania mikrostruktury warstw porowatych. W części przeanalizowano skład chemiczny oraz strukturę napawanych powierzchni, które posłużyły do dalszych badań. Dla scharakteryzowania właściwości uzyskanej napoiny porowatej zostały przeprowadzone badania własności mechanicznych - pomiar mikrotwardości oraz obserwacja mikrostruktury na zgładach metalograficznych za pomocą mikroskopu metalograficznego. Obserwację wykonano na zgładach trawionych. Została przeprowadzona analiza liniowa dzięki której został otrzymany rozkład stężenia wybranych pierwiastków rozmieszczonych wzdłuż tej linii.
    The paper describes the study of porous layers for-mation process made with Fe on the carbon steel base. To form the layer there was used method of consisting combination of pulse microwelding paste layer on the S235 steel surface. The paste layer was combined as a mixture of different powders like Fe2O3, Fe, Cu and mineral oil. The resistive pulse microwelding techniques were applied on the layer. Whole process of applying layers was controlled manually. The deposit was sintered with reduction oxides in dissociated ammonia. There was prepared mixture of iron powder ASC 100.29, ASC 100.24, Distaloy SE (source: the Höganäs company) and iron oxide in various compositions. Tomixturesthere were also added Cu, inorder to im-prove thelayer propertiesafter sintering. The layers were investigated with metallographic methods and EDS analyses. Using EDS analysis, there were identi-fied a types of alloying elements and the extent of diffu-sion from Fe foam into to S235 steel. Also, there was investigated microhardness by Vicers method. Microscopic examinationwas carried outto examinethe structure offormedlayers.Image analysismethodswere usedto measurethe size ofthe cross-sectionporosity. Studies have determined basic quality parameters of the covered layers.
    Źródło:
    TTS Technika Transportu Szynowego; 2015, 12; 374-377, CD
    1232-3829
    2543-5728
    Pojawia się w:
    TTS Technika Transportu Szynowego
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pool Boiling Heat Transfer from Rough and Microstructure Coated Surfaces
    Wymiana ciepła przy wrzeniu na powierzchniach chropowatych i z pokryciem mikrostrukturalnym
    Autorzy:
    Orman, Łukasz J.
    Orman, Katarzyna
    Wojton, Iwona
    Powiązania:
    https://bibliotekanauki.pl/articles/1811614.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    boiling heat transfer
    porous coatings
    rough surface
    wymiana ciepła przy wrzeniu
    pokrycie porowate
    chropowatość
    Opis:
    The paper presents the test results of pool boiling heat transfer on the rough surface and the surface covered with capillary – porous microstructure. The porous layer is made of copper fibers sintered in the reduction atmosphere. The volumetric porosity amounted to 68%, while its height 1 mm. Distilled water and ethyl alcohol were used as the working fluids. The experiments have been carried out under the atmospheric pressure. Enhancement of heat transfer in relation to the smooth reference surface has been recorded especially for the low range of superheats, which might be related to the density of active nucleation sites. Experimental results have been compared with selected models of boiling available in literature.
    Artykuł przedstawia wyniki badań wymiany ciepła przy wrzeniu na powierzchniach chropowatych i z porowatym pokryciem metalowo-włóknistym. Mikrostruktura porowata została wykonana z włókien miedzianych spiekanych w atmosferze redukcyjnej. Porowatość objętościowa wynosi 68%, a wysokość warstwy 1 mm. Badania prowadzono dla wody destylowanej i alkoholu etylowego jako cieczy wrzących pod ciśnieniem atmosferycznym. Zaobserwowano intensyfikację wymiany ciepła w porównaniu do powierzchni gładkiej, szczególnie w zakresie małych przegrzań, co może być związane z gęstością aktywnych centrów nukleacji. Wyniki badań eksperymentalnych porównano z wybranymi modelami wrzenia dla danych powierzchni.
    Źródło:
    Rocznik Ochrona Środowiska; 2020, Tom 22, cz. 1; 514-525
    1506-218X
    Pojawia się w:
    Rocznik Ochrona Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characterization Of The Graded Microstructure In Powder Sintered Porous Titanium
    Charakterystyka gradientowej mikrostruktury porowatego tytanu spiekanego z proszku
    Autorzy:
    Oak, J.-J.
    Bang, J. I.
    Bae, K.-C.
    Kim, Y. H.
    Lee, Y. C.
    Chun, H. H.
    Park, Y. H.
    Powiązania:
    https://bibliotekanauki.pl/articles/356239.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    titanium
    powder metallurgy
    porous structure
    sintering
    biomaterial
    tytan
    metalurgia proszków
    struktura porowata
    spiekanie
    biomateriał
    Opis:
    The proposed sintering process produce porosity and functional graded microstructure in the sinterd titanium powders. Titanium powders with different micro sizes were sintered at the proposed temperature region at 1200 and 1300°C for 2h. The apatite-forming on the graded microstructure is observed by immersion test in Hanks balanced salt soluion at 37°C. Sintering condition of titanium powders is estimated by thermogravitmetry-differential thermal analysis (TG-DTA). The synthersied surface structures and apatite-forming ability were characterized by a field emission scanning electron microscopy (FE-SEM) observation and energy dispersive X-ray spectroscopy (EDS) analysis. As results, these graded microstructure of sintered porous titanium powders reveals apatite-forming ability as osseointegration by calcification in Hanks balanced salt soluion(HBSS) at 37°C.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 2B; 1265-1269
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment of the microstructure and mechanical properties of porous gelatin scaffolds
    Autorzy:
    Morawska-Chochół, Anna
    Powiązania:
    https://bibliotekanauki.pl/articles/2058382.pdf
    Data publikacji:
    2021
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Tematy:
    scaffold
    microstructure
    tissue engineering
    gelatin
    freeze-drying
    mikrostruktura
    inżynieria tkankowa
    żelatyna
    Opis:
    Gelatin scaffolds are in the interest of tissue engineering and drug release. The scaffold porosity and microarchitecture are of great importance in proper tissue regeneration. In this work, the freeze-drying method was used to produce the scaffolds. The effect of concentration of the initial gelatin solution and pre- -freezing temperature on the scaffold’s microstructure and microarchitecture (porosity, pores size, shape, and distribution) was evaluated. The mechanical tests of samples were performed. Moreover, the influence of the gentamicin sulphate addition on the gelatin scaffolds microstructure and mechanical properties was also studied. The linear relationship of porosity to the concentration of the initial solution was observed. Therefore, it is possible to obtain a scaffold with a planned porosity. Pores were interconnected with an aspect ratio between 1.5-1.8. For porosity 74 ± 9% the average pore size was 0.7 ± 0.6 mm, with most pores in the range 0.2-0.4 mm. For the samples with porosity 57 ± 14%, the average pore size was 0.2 ± 0.2 mm, with most pores in the range 0.05-0.2 mm. The process of pre-freezing the solution in liquid nitrogen caused the highest porosity of the sample, the smaller pores size and the lower pores size distribution in comparison to the sample pre-frozen in -20°C. The mechanical parameters for all the samples are sufficient for filling bone defects. The addition of a drug to gelatin caused only slight changes in the pore architecture. This material could be applied as a scaffold in the bone loss correlated to bacterial infection.
    Źródło:
    Engineering of Biomaterials; 2021, 4, 160; 22--27
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evolutionary identification of microstructure parameters in the thermoelastic porous material
    Autorzy:
    Długosz, Adam
    Schlieter, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/1839666.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    thermoelasticity
    identification
    numerical homogenization
    evolutionary algorithms
    Opis:
    The work is devoted to the identification of microstructure parameters of a porous body under thermal and mechanical loads. The goal of the identification is to determine the parameters of the microstructure on the basis of measurements of displacements and temperatures at the macro level. A two-scale 3D coupled thermomechanical model of porous aluminum is considered. The representative volume element (RVE) concept modeled with periodical boundary conditions is assumed. Boundary-value problems for RVEs (micro-scale) are solved by means of the finite element method (FEM). An evolutionary algorithm (EA) is used for the identification as the optimization technique.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2020, 58, 2; 373-384
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Al2O3 decoration on the opto-electrical properties of a porous Si/Cr2O3 composite
    Autorzy:
    Ghrib, Mondher
    Tlili, B.
    Razeg, M.
    Ouertani, R.
    Gaidi, M.
    Ezzaouia, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1818241.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    porous Si
    microstructure
    optical and electrical properties
    Opis:
    In this work, we present an extensive investigation of the effect of Al₂O₃ decoration on the morphological, structural and opto-electronic properties of a porous Si (Sip)/Cr₂O₃ composite. The Sip layers were prepared by the anodization method. Al₂O₃ and Cr₂O₃ thin films were deposited by physical vapour deposition. The morphological and micro-structural properties of Sip/Cr₂O₃/Al₂O₃ were studied using the scanning electron microscope, energy dispersive X-ray spectroscopy and X-ray diffraction techniques. It was found that Al₂O₃ decoration with different concentration strongly affects the Sip/Cr₂O₃ microstructure mainly at the level of porosity. Variable angle spectroscopic ellipsometry demonstrates a strong correlation between optical constants (n and k) of Sip/Cr₂O₃/Al₂O₃ and microstructure properties. Dielectric properties of Sip/Cr₂O₃/Al₂O₃ such as electrical conductivity and conduction mechanism were explored using impedance spectroscopy over the temperature interval ranging from 340 to 410°C. A semiconductor to the metallic transition has been observed at high frequency.
    Źródło:
    Opto-Electronics Review; 2020, 28, 3; 155 --163
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multiobjective optimiaztion of microstructure parameters in a thermoelastic porous material by means of differential evolution and elements of game theory
    Autorzy:
    Długosz, Adam
    Schlieter, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/29520065.pdf
    Data publikacji:
    2022
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    multiobjective optimization
    thermoelasticity
    porous materials
    multiscale problem
    representative volume element
    differential evolution
    game theory
    Opis:
    The paper is devoted to the optimization of the microstructure parameters of a porous medium under thermo-mechanical loading. Four different criteria related to the properties of the porous material have been proposed and numerically implemented. To solve a multiobjective problem, a novel method based on the coupling of differential evolution and elements of game theory is used. The proposed algorithm features an appropriate balance between exploration and exploitation of objective space, which is necessary for the successful optimization of these types of tasks with the use of numerical simulations. The model of the thermo-elastic porous material is composed of two-scale direct analysis based on a numerical homogenization. Direct thermoelastic analysis with representative volume element (RVE) and finite element method (FEM) is performed. Numerical example of the optimization illustrating the usefulness of the proposed method is included.
    Źródło:
    Computer Methods in Materials Science; 2022, 22, 3; 117-124
    2720-4081
    2720-3948
    Pojawia się w:
    Computer Methods in Materials Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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