Temat: microtomography - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Pomiary porowatości skał metodą rentgenowskiej mikrotomografii komputerowej (Micro-CT)
Rock porosity measurements using Roentgen computed microtomography (Micro-CT)
Autorzy:: Dohnalik, M.
Zalewska, J.
Tematy:: porowatość
mikrotomografia
porosity
microtomography; Pokaż więcej
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Powiązania:: https://bibliotekanauki.pl/articles/183665.pdf Link otwiera się w nowym oknie
Opis:: Roentgen computed microtomography is an imaging technique that generates high resolution 3D images of internal structure, basing on difference in X-rays absorption inside the sample. Micro-CT provides new possibilities to obtain up to few microns resolution images of reservoir rocks in non destructive way. Such images enables to visualize and quantitative analysis of mineral composition and pore structure (volume, shape and pore throat diameter), which can be used to better understanding petrophysical properties such as permeability. This paper shows test of direct, quantitative porosity measurement based on 3D images obtained using Benchtop device and AVIZO software.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: A preliminary study of three-dimensional reconstruction of the human osseous labyrinth from micro-computed tomography scans
Autorzy:: Wróbel, Andrzej
Skrzat, Janusz
Walocha, Jerzy
Opis:: The adult human temporal bone was investigated using micro-CT scans. Various aspects of the osseous labyrinth were presented in figures which are effect of the volume rendering. The 3D reconstructions were performed to visualize the cochlea and the semicircular canals embedded in the petrous bone. The final product of this study was a digital three-dimensional model of the entire osseous labyrinth which can be viewed at different angles on the computer screen.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 3.

Tytuł:: The application of X-Ray Computed Microtomography for estimation of petrophysical parameters of reservoir rocks
Autorzy:: Kułynycz, Vitalij
Maruta, Michał
Tematy:: computer microtomography
petrophysical parameters
reservoir rocks; Pokaż więcej
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Powiązania:: https://bibliotekanauki.pl/articles/1179531.pdf Link otwiera się w nowym oknie
Opis:: In the reservoir geology, X-Ray microtomography (micro-CT) is mainly used for three-dimensional visualization of minerals and rocks. For rock sample testing, micro-CT technology enables quantitative measurements of the internal structure of rock material in a precise and non-destructive manner and, above all, allows accurate measurements of the spatial pore system. By using this method, you can get detailed information about porosity: it is possible to measure the length and number of channels pore, tracing their connections, visualization and quantitative assessment of their tortuosity and permeability, observing the penetration of water or oil in the rock, analyzing the degree of filling the pores of the rock different media and imaging and analysis of the wettability process. With this method you can also get a permeability analysis (in three orthogonal directions), estimate the fracture and hydraulic conductivity of the rock medium [1]. The paper discusses the method of X-Ray microtomography, presents data acquisition and reconstruction of the internal structure of reservoir rocks for hydrocarbons. The results of research on petrophysical parameters of Polish reservoir rocks and global oil and gas deposits were presented using a modern research method, based on the literature review of micro-CT method.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: X-ray micro computed tomography characterization of porosity in Rotliegend sandstones on the northern slope of the Wolsztyn Ridge, western Poland
Autorzy:: Poszytek, A.
Mikołajewski, Z.
Dohnalik, M.
Tematy:: Rotliegend
lithologic traps
sandstones
porosity
Wolsztyn Ridge
computed microtomography; Pokaż więcej
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Powiązania:: https://bibliotekanauki.pl/articles/2060542.pdf Link otwiera się w nowym oknie
Opis:: Natural gas in the Polish Rotliegend Basin occurs in porous and permeable aeolian sandstones, and traps are mostly structural. Lithological traps are rare and occur on the northern slope of the Wolsztyn Ridge where fluvial and aeolian sandstones overlap with alluvial facies. Both fluvial and aeolian sandstones are reservoir rocks in this area. The X-ray micro computed tomography (MCT) results and microscopic observations indicate that the sandstones in lithologic traps on the northern slope of the Wolsztyn Ridge form highly compartmentalized vertical reservoir rocks composed of four types of sandstones. The profiles are dominated by very low-porosity fluvial sandstones (F2), and low-porosity aeolian and fluvial sandstones (A2, F1). The A1 type of sandstones with high porosity (10%) occurs only in some sections of the profiles. The most important diagenetic processes that reduced porosity were compaction and cementation by carbonate cements. All studied sandstones were subjected to the same diagenetic processes. However, each of the processes ran with varying intensity in different types of sandstones. Detailed analyses of pore distribution by MCT methods with respect to primary depositional or lithofacies effects, and secondary diagenetic effects, help to understand the 3D geometry of pores and pore shape-size distributions. The results can be used in the studies of other sandstones with a different origin and age.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Osmotic dehydration and freezing as a suitable pretreatment in the process of vacuum drying kiwiberry: drying kinetics and microstructural changes
Autorzy:: Bialik, M.
Wiktor, A.
Witrowa-Rajchert, D.
Samborska, K.
Gondek, E.
Findura, P.
Tematy:: Actinidia arguta
X-ray microtomography
mathematical modelling
drying kinetics; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Agrofizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/2082900.pdf Link otwiera się w nowym oknie
Opis:: This study investigated the effects of osmotic dehydration and freezing on the kinetics and microstructure of vacuum-dried kiwiberry. Both fresh and previously frozen fruit were dehydrated in sucrose, maltitol and xylitol. Freezing and osmotic dehydration were selected as possible ways to improve the drying kinetics and positively influence the taste of the fruit. This experiment focused on the analysis of microstructural changes induced by applied processing methods using the X-ray microtomography technique. The results showed that the fruit pretreated in sucrose suffered the least structural damage as expressed by the largest condensation of small pores and thin cell walls. Freezing and xylitol resulted in the accumulation of larger pores and thicker walls. The most rapid drying time of 678-688 min was observed for unfrozen samples, dehydrated in sucrose and maltitol. Freezing slowed down the drying process, by 60-100 min, in comparison to the unfrozen samples. The applied mathematical models proved useful in predicting the kinetics of the drying process. The equation proposed by Midilli et al. provided the best fit for predicting the kinetics of the process.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Model of pathological collagen mineralization based on spine ligament calcification
Autorzy:: Orzechowska, Sylwia
Świsłocka, Renata
Lewandowski, Włodzimierz
Opis:: The aim of the study was to determine the time of mineral growth in human spine ligaments using a mathematical model. The study was based on our previous research in which the physicochemical analysis and computed microtomography measurements of deposits in ligamenta flava were performed. Hydroxyapatite-like mineral (HAP) constituted the mineral phase in ligament samples, in two samples calcium pyrophosphate dehydrate (CPPD) was confirmed. The micro-damage of collagen fibrils in the soft tissue is the crystallization center. The growth of the mineral nucleus is a result of the calcium ions deposition on the nucleus surface. Considering the calcium ions, the main component of HAP, it is possible to describe the grain growth using a diffusion model. The model calculations showed that the growth time of CPPD grains was ca. a month to 6 years, and for HAP grains >4 years for the young and >5.5 years for the elderly patients. The growth time of minerals with a radius >400 μm was relatively short and impossible to identify by medical imaging techniques. The change of growth rate was the largest for HAP deposits. The mineral growth time can provide valuable information for understanding the calcification mechanism, may be helpful in future experiments, as well as useful in estimating the time of calcification appearance
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 7.

Tytuł:: Wizualizacja przestrzeni porowej skał z wykorzystaniem mikrotomografii rentgenowskiej
Visualization of pore space using Roentgen microtomography
Autorzy:: Zalewska, J.
Dohnalik, M.
Tematy:: mikrotomografia
wizualizacja
przestrzeń porowa
piaskowce
microtomography
visualization
pore space
sandstones; Pokaż więcej
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Powiązania:: https://bibliotekanauki.pl/articles/183670.pdf Link otwiera się w nowym oknie
Opis:: Roentgen computed microtomography (micro-CT) allows visualizing internal structure of measured objects determined by density differences. Micro-CT measurements enable obtaining of many parallel 2D cross sections, which allows to project in 3D particular properties. Main micro-CT applications are porosity measurements and visualizations. The paper shows first results of measurements and imaging of rock porous space, using micro-CT method.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Saurichthys (Pisces, Actinopterygii) teeth from the Lower Triassic of Spitsbergen, with comments on their stable isotope composition (δ13C and δ18O) and X−ray microtomography
Autorzy:: Błażejowski, Błażej
Duffin, Christopher J.
Gieszcz, Piotr
Małkowski, Krzysztof
Binkowski, Marcin
Walczak, Michał
McDonald, Samuel A.
Withers, Philip J.
Tematy:: Arctic
Svalbard
fish teeth
stable isotopes
x−ray microtomography
Lower Triassic; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/2051411.pdf Link otwiera się w nowym oknie
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: X-ray microtomography (XMT) of fossil brachiopod shell interiors for taxonomy
Autorzy:: Blazejowski, B.
Binkowski, M.
Bitner, M.A.
Gieszcz, P.
Tematy:: x-ray microtomography
fossil
brachiopod
shell
taxonomy
remains
paleontology
Terebratula terebratula; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Powiązania:: https://bibliotekanauki.pl/articles/23513.pdf Link otwiera się w nowym oknie
Opis:: The ability to see and understand the three−dimensional structure of an investigated object plays a key role in studying fossil remains. All living organisms are formed in threedimensions, but unfortunately fossilization processes often reduce overall shape, making it difficult to gather information about real overall appearance, functionality, and inner structure. Here, using a specimen of the brachiopod Terebratula terebratula we demonstrate a non−destructive technique for exploring the 3−D internal structure of fossil remains. The use of tomography allows the construction of a set of transverse serial sections in the manner used by brachiopod researchers for decades.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Root Canal System Analysis with a Group of First Permanent Molars of Upper and Lower Jaw
Analiza systemu kanałowego w pierwszych zębach trzonowych szczęki i żuchwy
Autorzy:: Mroczek, K.
Szlązak, K.
Jodkowska, E.
Święszkowski, W.
Kurzydłowski, K.J.
Tematy:: endodontics
root canal system configuration
microtomography
endodoncja
konfiguracja kanałów korzeniowych
mikrotomografia; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/355703.pdf Link otwiera się w nowym oknie
Opis:: A progressive bacteria invasion on tooth tissues leads to pulp inflammation, microabscesses of the pulp, destruction and in consequence inflammation of periapical tissues. Therefore the aim of endodontic treatment is three dimensional debridement of a root canal from the vent in pulp chamber to the physiological narrowing. Therefore the aim of the study is analysis of root canal configuration, number of canals, presence of lateral canals and canal delta with the group of first permanent molars. At the same time the accuracy of the radiological examination (x-ray images) is estimated due to comprehension of X-ray images performed before teeth preparation with root canal system and after observation of transversal cuts by means of light microscopy and microtomography. This establishment is presented through the differences in conventional radiological image and clinical assessment.
Postępująca inwazja bakteryjna w tkankach zęba prowadzi do zapalenia miazgi, powstawania w niej mikroropnii, zniszczenia a w konsekwencji do zapalenia ozębnej. Z tego względu celem leczenia endodontycznego stało się trójwymiarowe oczyszczenie kanału korzeniowego od jego ujścia do przewężenia fizjologicznego. Dlatego celem pracy jest analiza konfiguracji, ilości kanałów korzeniowych, istnienia kanałów bocznych oraz delty korzeniowej w grupie pierwszych zębów trzonowych stałych w uzębieniu ludzkim. Jednocześnie ocenie poddawana jest dodatkowo swoistość badania radiologicznego (zdjęcia zębowe), poprzez porównanie zdjęć rentgenowskich wykonanych przed preparacją zębów z obrazem systemu kanałowego uzyskanego na podstawie mikrotomografii oraz po wykonaniu szlifów poprzecznych i ich obserwacji na mikroskopie świetlnym. Celem tej oceny jest zaprezentowanie rozbieżności pomiędzy oceną radiologiczną systemu kanałowego a kliniczną.
Dostawca treści:: Biblioteka Nauki

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