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Dissertations / Theses on the topic 'Microfractura'

Author: Grafiati

Published: 5 June 2025

Last updated: 16 July 2025

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Consult the top 21 dissertations / theses for your research on the topic 'Microfractura.'

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1

Toal, Victoria Rachel. "The mechanics of microdamage and microfracture in trabecular bone." Thesis, Queensland University of Technology, 2013. https://eprints.qut.edu.au/62884/1/Victoria_Toal_Thesis.pdf.

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This thesis presents a study using mechanical testing techniques combined with advanced computational methods to examine the mechanics of bone. It contributes novel observations and analysis of how bones fail at the microscopic level, which will be valuable in furthering our understanding and the treatment of bone damage in health and disease, including osteoporosis.

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2

Rainey, Michelle M. "Microfractures in the weathering of igneous rock." Thesis, Queen's University Belfast, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.239231.

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3

DUEZ, MICHEL. "Fractures et microfractures de l'organe dentaire : cas particuliers et detection." PARIS 6, DENTAIRE, 1994. http://www.theses.fr/1994PA06H003.

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4

Fan, Zhiqiang. "Primary migration of hydrocarbons through microfracture propagation in petroleum source rocks." Thesis, The University of Maine, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=3573311.

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<p>Petroleum is generated from finely grained source rocks rich in organic materials and accumulated and trapped in reservoir rocks with relatively higher permeability and porosity. Expulsion of petroleum through and out of source rocks is called primary migration. Primary migration, as a link between source rocks and carrier rocks, presents a vital challenge to the society of petroleum geosciences and exploration and attracts the research interests of many geologists and geochemists. Despite extensive research the effective mechanisms responsible for primary migration of hydrocarbons are stil

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5

Liebesny, Paul Hancock. "Single-dose growth factor treatments to enhance cell recruitment and neotissue integration in an augmented microfracture cartilage repair model." Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/104225.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Biological Engineering, 2016.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 198-215).<br>Focal cartilage defects caused by joint injury have a limited capacity to self-repair, and if left untreated, can lead to the early onset of osteoarthritis. The current gold standard of care, microfracture surgery, induces an endogenous repair response, but typically results in poorly integrated fibrocartilage, rather than native hyaline cartilage. The objective of this thesis was to test the hypot

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6

Doria, Jaureguizar Guillermo. "Estudio in vitro mediante microscopio electrónico de barrido de las microfracturas producidas en la preparación de la resección radicular y la cavidad retrógrada." Doctoral thesis, Universitat Internacional de Catalunya, 2017. http://hdl.handle.net/10803/461361.

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La evaluación radiográfica y las pruebas diagnósticas son de vital importancia para realizar un adecuado plan de tratamiento. Hasta la actualidad las Radiografías Periapicales han sido un complemento indispensable para realizar el tratamiento endodóntico. Sin embargo, está demostrado que las Radiografías Periapicales presentan ciertas limitaciones. La tomografía computarizada de haz cónico (TCHC), es una herramienta que puede ayudar a superarlas. Esta tesis doctoral se configura mediante un compendio de dos artículos de primer cuartil (publicados en el Journal of Endodontics) y se ha basado

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7

Fathy, Tahoun Mahmoud. "The value of using chitosan based implant with microfractures for treatment of acetabular cartilage lesions associated with femoroacetabular impingement." Doctoral thesis, Universitat Autònoma de Barcelona, 2020. http://hdl.handle.net/10803/671091.

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El xoc femoroacetabular (XFA), com un canvi en la morfologia de l’fèmur proximal o l’acetàbul, produeix una alteració mecànica en l’articulació del maluc que pot iniciar el procés degeneratiu i finalment l’osteoartritis. Hi ha dos problemes seriosos associats amb XFA; La delaminació condral, que passa amb més freqüència amb el cap no esfèrica de l’fèmur (tipus CAM) a causa de les forces de tall repetides, i el dany labral que és més freqüent amb la sobrecobertura acetabular (tipus pinça) a causa de les forces de compressió repetides. El propòsit d’aquest estudi va ser avaluar els resultats a c

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8

Carvalho, Pedro Henrique de. "Estudo do efeito da injeção de PRP e concentrado de medula óssea sobre o reparo de defeitos condrais experimentalmente induzidos e tratados com microfraturas e ácido hialurônico." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/10/10137/tde-16092015-153526/.

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Defeitos de cartilagem e a mais comum doença articular, a osteoartrite, são caracterizadas pela destruição da cartilagem articular, e consequentemente na perda da função articular em humanos e animais. As estratégias atuais de tratamento, conservativas e cirúrgicas, são insuficientes: não resultam em restauração total da cartilagem hialina, e, portanto trazem um prognóstico reservado a longo prazo. O presente estudo tem por objetivo avaliar os efeitos do administração conjunta de concentrado de medula óssea, plasma rico em plaqueta sobre lesões condrais experimentalmente induzidas e tratadas c

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9

Agnew, Amanda Marie. "Histomorphometry of the Elderly Rib: A methodological approach with implications for biomechanics, function, and fracture risk." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1305558389.

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10

Borhara, Krishna. "Assessing the Role of Silica Gel as a Fault Weakening Mechanism in the Tuscarora Sandstone." Bowling Green State University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1429218108.

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11

Toussaint, Renaud. "Fracturation des roches en compression : le processus de localisation en tant que phénomène critique." Phd thesis, Université Rennes 1, 2001. http://tel.archives-ouvertes.fr/tel-00012208.

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La fracturation fragile des roches soumises à des cisaillements sous<br />fortes pressions de confinement présente des traits communs avec une transition de phase thermodynamique: la déformation se localise rapidement à l'échelle des grains dès la sortie du régime élastique réversible, tout en restant d'abord homogène aux grandes échelles. Alors que les microfractures individuelles croissent encore de façon stable, apparaissent autour de la contrainte pic des structures de grande échelle (bandes de cisaillement) qui brisent spontanément les symétries translationnelle et rotationnelle du problè

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12

Michel-Normand, Dominique. "Minéralisations aurifères et morphoscopie de l'or natif." Vandoeuvre-les-Nancy, INPL, 1993. http://www.theses.fr/1993INPL159N.

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Des études géochimiques et morphoscopiques de l'or natif dans différents types de minéralisations aurifères, intégrées dans chaque cas au contexte gitologique, ont permis de déterminer les mécanismes de mise en place de l'or. Dans les veines de quartz aurifères des ceintures de roches vertes des mines de fazenda brasileiro et maria Lazara (brésil), il existe deux générations d'or natif, systématiquement associées à des sulfures, en présence de microfractures. La présence de grains d'or à aspect globulaire-réniforme et à développement bidimensionnel avec de nombreuses perimorphoses rhombiques,

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13

Eljarray, Abdelali. "Circulations fluides et altérations hydrothermales associées à des dépôts U (As, F) dans le massif de Saint Sylvestre (NW du massif central français)." Vandoeuvre-les-Nancy, INPL, 1993. http://www.theses.fr/1993INPL009N.

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Ce travail consacre à l'étude des transferts de l'uranium aux différents stades hydrothermaux dans le massif de saint sylvestre (NW du M. C. F. ), et aux caractéristiques des perturbations d'ordre géochimique, minéralogique et structural qui leur sont associées, a été réalisée grâce à une approche pluridisciplinaire. Il a permis de connaitre: (1) la remobilisation tardive d'uranium hors du gisement et son ampleur; (2) les relations entre les différentes phases d'altération et la minéralisation primaire qui se traduisent par des marqueurs spécifiques et des orientations de réseaux de micro à ma

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14

Ni, Liu Yen, and 劉燕妮. "The microfracture mechanism of heat-treated 7075 Aluminum." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/12781995433523909532.

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15

Bradley, Erin. "Characterization of Damage Zones Associated with Laboratory Produced Natural Hydraulic Fractures." 2012. https://scholarworks.umass.edu/theses/893.

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Both joint sets and fault-related fractures serve as important conduits for fluid flow. In the former case, they can strongly influence both permeability and permeability anisotropy, with implications for production of water, hydrocarbons and contaminant transport. The latter can affect issues of fluid flow, such as whether a given fault seals or leaks, and fault mechanics. These fractures are commonly interpreted as Natural Hydraulic Fractures (NHFs), i.e., mode 1 fractures produced when pore fluid pressure exceeds the tensile strength of the rock. Various mathematical models have been a rich

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16

Aderibigbe, Aderonke. "Rock-Fluid Chemistry Impacts on Shale Hydraulic Fracture and Microfracture Growth." Thesis, 2012. http://hdl.handle.net/1969.1/ETD-TAMU-2012-05-11129.

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The role of surface chemical effects in hydraulic fracturing of shale is studied using the results of unconfined compression tests and Brazilian tests on Mancos shale- cored at depths of 20-60 ft. The rock mineralogy, total organic carbon and cation exchange capacity were determined in order to characterize the shale. Adsorption tests to study the interaction of the shale and aqueous fluid mixture were also carried out using surface tension measurements. The uniaxial compressive strengths and tensile strengths of individual shale samples after four hours exposure to water, 2.85 x 10^-3 M cati

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17

Weng, Biing-Jyh, and 翁炳志. "On the Strengthening and Microfracture Behaviors of 6000 Series Aluminum Composites." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/62577378990229133393.

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18

Lin, K. jack, and 林克劼. "Acoustic Emission Wave Propagation due to Microfractures in Composite Laminates." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/16461069593625936653.

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碩士<br>國立交通大學<br>機械工程系<br>87<br>Acoustic Emission Wave Progagation due to Microfractures in Composite Laminates Student : K. Jack Lin Advisor : Dr. Ching-Chung Yin Department of Mechanical Engineering National Chiao Tung University ABSTRACT Surface responses of acoustic emission waves resulted from microfractures in composite laminates is theoretically studied in this thesis. The representation theorem with seismic moment tensors is used to formulate dynamic responses due to formation of the micro-defects, such as fi

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19

Apiwathanasorn, Sippakorn. "Evidence of Reopened Microfractures in Production Data of Hydraulically Fractured Shale Gas Wells." Thesis, 2012. http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11749.

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Frequently a discrepancy is found between the stimulated shale volume (SSV) estimated from production data and the SSV expected from injected water and proppant volume. One possible explanation is the presence of a fracture network, often termed fracture complexity, that may have been opened or reopened during the hydraulic fracturing operation. The main objective of this work is to investigate the role of fracture complexity in resolving the apparent SSV discrepancy and to illustrate whether the presence of reopened natural fracture network can be observed in pressure and production data of

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20

Xu, Guangjian. "Fluid inclusion studies of microfractures in Eriboll Formation, NW Scotland : insights into timing of fracture opening." Thesis, 2012. http://hdl.handle.net/2152/ETD-UT-2012-05-5857.

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The Cambrian Eriboll Formation exposed in the footwall of the Moine Thrust, NW Scotland, provides a suitable outcrop analog for naturally fractured tight-gas sandstone reservoirs. Previous studies distinguished five regional sets of quartz-lined or quartz-filled macrofractures (>10 m in opening displacement) that have the following strikes, from oldest to youngest, N, NW to WNE, NE, EW, and NNE (set A through set E), respectively (Laubach and Diaz-Tushman, 2009). Crosscutting relations among microfractures imaged by scanning electron microscope cathodoluminescence (SEM-CL) indicate that micro

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21

Ayyildiz, Muhammed. "Scales Depencence of Fracture Density and Fabric in the Damage Zone of a Large Displacement Continental Transform Fault." Thesis, 2012. http://hdl.handle.net/1969.1/148095.

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Characterization of fractures in an arkosic sandstone from the western damage zone of the San Andreas Fault (SAF) at San Andreas Fault Observatory at Depth (SAFOD) was used to better understand the origin of damage and to determine the scale dependence of fracture fabric and fracture density. Samples for this study were acquired from core taken at approximately 2.6 km depth during Phase 1 drilling at SAFOD. Petrographic sections of samples were studied using an optical petrographic microscope equipped with a universal stage and digital imaging system, and a scanning electron microscope with ca

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