Tesis sobre el tema "Ablation mechanism"
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Lo, Ka Ming. "Laser ablation of aqueous samples at 193-nm : mechanism and applications". HKBU Institutional Repository, 2000. http://repository.hkbu.edu.hk/etd_ra/224.
Texto completoKolloch, Mihai Andreas Jonas [Verfasser]. "Plasmon Resonances for Sub-100 nm Silicon Ablation : Quantitative Measurement and Nanometer-Scale Ablation Mechanism / Mihai Andreas Jonas Kolloch". Konstanz : Bibliothek der Universität Konstanz, 2012. http://d-nb.info/1037311949/34.
Texto completoIntini, Marques Rodrigo. "A mechanism to accelerate the late ablation in pulsed plasma thrusters". Thesis, University of Southampton, 2009. https://eprints.soton.ac.uk/67314/.
Texto completoLappalainen, J. (Jyrki). "Laser-ablation deposition and characterization of polycrystalline Nd-modified Pb(Zr,Ti)O3 thin films". Doctoral thesis, University of Oulu, 1999. http://urn.fi/urn:isbn:9514254317.
Texto completoTamura, Ayaka. "Mechanism of laser-plasma formation in water and the application to in-situ elemental analysis". 京都大学 (Kyoto University), 2015. http://hdl.handle.net/2433/199322.
Texto completoLippert, Thomas. "Photopolymers designed for laser ablation ablation mechanisms and applications /". Zürich : ETH, Eidgenössische Technische Hochschule Zürich, Paul Scherrer Institut, Materials Development and Characterization Group, 2002. http://e-collection.ethbib.ethz.ch/show?type=habil&nr=8.
Texto completoAlbagli, D. (Douglas). "Fundamental mechanisms of pulsed laser ablation of biological tissue". Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/33521.
Texto completoAllen, Matthew Robert. "Mechanisms of impaired osteoblast function during disuse". Diss., Texas A&M University, 2003. http://hdl.handle.net/1969.1/1056.
Texto completoVIDAL, JOSE T. "Desenvolvimento de um sistema opto-mecanico para micro usinagem com laser de fentossegundos". reponame:Repositório Institucional do IPEN, 2010. http://repositorio.ipen.br:8080/xmlui/handle/123456789/9563.
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Dissertacao (Mestrado)
IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
Molto, Cécile. "Understanding reaction mechanisms of electrochemical metallization processes used for silicon photovoltaic cells". Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPASV016.
Texto completoIn this thesis work, Ni/Cu electrochemical deposition (“plating”) is studied as an alternative to the mainstream screen-printing technique based on Ag and Al metallic pastes to produce industrial c-Si solar cells. Ni/Cu plating has the potential to improve the quality of metallic contacts and increase c-Si solar cell efficiency. The use of cheaper metals is a strong asset to reduce the production costs. However, Ni/Cu plating is still at an introductory phase and there are some issues to deal with.The goal of this thesis is to investigate the successive steps of Ni/Cu plating process for bifacial n-PERT c-Si solar cells and understand the physico-chemical phenomena involved to address the related issues.On the first step, laser ablation parameters have been optimized to selectively ablate the dielectric layers while limiting the impact on the underlying Si. An ablation mechanism has also been proposed. Next steps of deoxidation and Pd activation of Si surface have been studied in two fluoride media (HF and NaHF2). NaHF2 provided higher SiOx etching rates and better Si surface activation. Next, homogeneity issues of Ni electroless deposition have been found, highlighting the need to make the deposition in dark conditions. Poor adherence on polished surface has been observed and areas of improvement have been suggested. The impact of non-optimized annealing parameters on cells conversion efficiencies has been demonstrated. The Ni/Cu plating process has been improved similar efficiencies than those of screen-printed reference cells have been achieved
Poçi, Dritan. "Atrial fibrillation : on its trigger mechanisms, risks and consequenses /". Göteborg : Dept. of Molecular and Clinical Medicine/Cardiology, Institute of Medicine, The Sahlgrenska Academy, University of Gothenburg, 2010. http://hdl.handle.net/2077/21927.
Texto completoStoian, Razvan. "Adaptive techniques for ultrafast laser material processing". Habilitation à diriger des recherches, Université Jean Monnet - Saint-Etienne, 2008. http://tel.archives-ouvertes.fr/tel-00352662.
Texto completoWidger, Alexander David. "Ablating ATR in mouse meiosis and its consequences for synapsis, recombination and meiotic surveillance mechanisms". Thesis, University College London (University of London), 2018. http://discovery.ucl.ac.uk/10043772/.
Texto completoKlein, Nina. "Contributions to understanding the mechanisms of action of electrolytic electroporation". Doctoral thesis, Universitat Pompeu Fabra, 2021. http://hdl.handle.net/10803/672699.
Texto completoLa electroporación es un fenómeno biofísico por el cual se aumenta la permeabilidad de la membrana celular a iones y moléculas cuando la célula se expone brevemente a elevados campos eléctricos. La electroporación es la base de múltiples modalidades novedosas de tratamiento clínico. La electroporación reversible es la base de la electroquimioterapia (ECT por sus siglas en inglés), una modalidad de tratamiento del cáncer en la que se aplican impulsos eléctricos para mejorar la absorción celular de agentes quimioterapéuticos. También es la base de la electrotransferencia génica, que se utiliza en múltiples terapias en pruebas clínicas, entre ellas vacunas y tratamientos contra el cáncer. La electroporación irreversible (IRE por sus siglas en inglés) se utiliza como técnica de ablación no térmica para el tratamiento de tumores sólidos. La electroporación electrolítica (E2) es una novedosa técnica de ablación de tejidos que combina la electroporación reversible con la electrólisis. El objetivo de este proyecto de investigación fue conocer mejor la interacción entre los dos componentes de la E2 para lograr la erradicación de los tumores. Para investigar el mecanismo de destrucción de células, se llevaron a cabo estudios in vitro, in vivo e in silico, y la información obtenida se combinó para demostrar los mecanismos de actuación subyacentes de la E2.
Jégou, Carole. "Intégration d'un film mince de Pb(Zr,Ti)O₃ dans une structure capacitive pour applications RF". Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112322/document.
Texto completoFerroelectric materials are raising a lot of interest due to their physical properties such as piezoelectricity, ferroelectricity or high dielectric constant. Thus, they are generally integrated in micro- and nano-systems as thin films in a capacitive configuration. Especially, the lead zirconate titanate oxide (PZT) is an attractive material for capacitive RF applications due to its high dielectric constant. The growth of the PZT thin film has to be controlled on metallic electrodes for its integration on coplanar transmission lines. Moreover, electrical properties such as leakage current and ferroelectric behavior of PZT have to be monitored upon application of a dc voltage bias for RF device operation. In this context, PZT thin films were grown by the pulsed laser deposition technique (PLD) on a La₀.₆₇Sr₀.₃₃MnO₃ (LSMO) / Pt (111) electrode on a monocrystalline sapphire substrate. The LSMO buffer layer is mandatory to avoid the formation of the paraelectric pyrochlore phase. The control of the crystalline orientation of the LSMO layer allows for the control of the PZT layer texture. Leakage currents through the Pt/PZT/LSMO/Pt stack were then studied in the 220-330K temperature range to determine the conduction mechanisms. A transition is evidenced between a bulk-controlled mechanism near room temperature and an interface-controlled mechanism at low temperature. A hopping mechanism is identified above 280K in line with the presence of extended defects and the columnar structure of the PZT layer. Several strategies were tested to control leakage currents. The first one consists in inserting an insulating oxide layer at the top Pt/PZT interface. In this way, charge injection was modified and leakage currents were reduced. The second strategy consists in changing the PZT layer bulk structure by elaborating a layered or columnar dielectric/PZT composite. Thus, an insulating oxide layer was inserted in the middle of the PZT layer and permitted to reduce leakage currents. Moreover, the control of the PZT nucleation allowed for the elaboration of a columnar PZT/pyrochlore composite. The leakage currents in this composite can be tuned through the pyrochlore pillars density among the ferroelectric matrix. Then, PZT and the heterostructures for leakage current control were integrated in a capacitive RF structure with gold coplanar transmission lines. RF performances in terms of isolation and insertion loss of these materials were studied and gave good results. In particular the heterostructures developed to control the leakage currents are promising for their integration in capacitive RF devices. Besides, I tried to extract the permittivity of PZT at high frequency with the PZT layer in a capacitive configuration. This study highlighted the essential modifications of the capacitive structure that have to be made in order to be able to exploit PZT properties at high frequency
Schaumberg, Christian Alexander. "Mechanismen der Laserablation zur Synthese nanoskopischer Kolloide". Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät, 2016. http://dx.doi.org/10.18452/17482.
Texto completoThe synthesis of colloidal nanoparticles has become a major topic in recent years. The pulsed laser ablation in liquids poses an alternative to the common wet-chemical approaches. Key features of the pulsed laser ablation in liquids are its simple setup, its versatility, and the possibility to generate surfactant-free colloidal nanoparticles. A further development of this technique is the use of suspended powders instead of bulk targets. This leads to higher productivities and even new materials. Although the generation of colloids by irradiating a suspension is straight forward, the underlying mechanisms of the size reduction from micrometer to nanometer sized particles appear to be quite complex. In order to reveal the mechanism a chemical approach was chosen. Hence, various copper compounds (Cu2C2, Cu5Si, Cu3N, Cu(N3)2, Cu3P, Cu2O, CuO, Cu2S, CuS and CuI) were used as a model system in order to investigate the impact of the leaving group on the ablation process. The generated nanoparticles were characterized with analytical transmission electron microscopy. These investigations clearly show that there are two distinct mechanisms involved in nanoparticle formation. The laser irradiation of precursors like CuO and Cu3N results in the formation of metallic copper nanoparticles. In the generated plasma copper atoms nucleate and form small primary particles. These particles later coalesce to larger secondary particles. In contrast to this reductive ablation, the irradiation of CuI follows a fragmentation mechanism. Here, the absorbed power of the laser beam does not produce a plasma but introduces thermal stress leading to fragmentation of the crystal while the chemical composition is preserved. The question which mechanism is predominant is of utmost importance as the chemical composition of the nanoparticles depends on the formation process. This is discussed on the example of the synthesis of Bi2Te3 nanoparticles, which can be used in thermoelectric applications.
Benchikh, Épouse Sbaï Nadia. "Couches minces nanostructurées de carbone amorphe dopées ou alliées : Elaboration par ablation laser femtoseconde et Caractérisations". Phd thesis, Université Jean Monnet - Saint-Etienne, 2005. http://tel.archives-ouvertes.fr/tel-00142211.
Texto completoL'ablation laser en régime femtoseconde est la technique utilisée pour la synthèse des couches minces de DLC dopées ou alliées. Ce sujet met également en évidence l'apport de cette technique sur les propriétés morpho-structurales et physiques des DLC dopés ou alliés.
O'Brien, Daniel. "Ablation Laser de microparticules de Terfenol-D (Tb0.3Dy0.7Fe1.92) en aérosol etdépôt supersonique des nanoparticules en résultant pour la fabrication defilms magnétostrictifs épais". Phd thesis, Ecole Centrale de Lille, 2007. http://tel.archives-ouvertes.fr/tel-00137712.
Texto completoLes couches déposées ont été caractérisées par la méthode des poutres pour déterminer le module élastique et le niveau de magnétostriction. Les couches étant poreuses en raison de leur nature granulée, leur module élastique était réduit à environ 15 GPa. Le niveau de magnétostriction des couches était d'environ 15 ppm ; cette magnétostriction réduite (1/30 de celui des couches fines) étant dû à un problème d'oxydation. Une analyse spectroscopique du plasma produit par l'ablation a permit la détermination de la source d'oxydation. L'étendue de l'oxydation des couches est apparue directement dépendante de la taille des microparticules utilisées initialement pour fabriquer les nanoparticules. Après calculs théoriques, pour des densités typiques d'aérosol utilisées dans le procédé LAM, il a été démontré que les nanoparticules fabriquées à partir de microparticules de plus de 3 µm de diamètre n'étaient pas affectées de façon significative par les impuretés présentes dans le gaz ou par l'oxydation de surface des microparticules. En revanche, les nanoparticules fabriquées à partir de microparticules de 0,3 µm de diamètre ou moins étaient, elles, oxydées et les couches en résultant l'étaient aussi. Experimentalement le diamètre des microparticules injectées en aérosol était présumé être entre ces deux cas.
Abtahi, Seyed Ali. "Ultrafast Laser Sampling of a Plant Tissue and ion Conductivity Measurement for Investigation of Light Stress Generation Mechanisms". Thesis, University of North Texas, 2010. https://digital.library.unt.edu/ark:/67531/metadc31522/.
Texto completoSchroeder, Olivia. "Verification and Validation Studies for the KATS Aerothermodynamics and Material Response Solver". UKnowledge, 2018. https://uknowledge.uky.edu/me_etds/122.
Texto completoHelvey, Jacob. "Experimental Investigation of Wall Shear Stress Modifications due to Turbulent Flow over an Ablative Thermal Protection System Analog Surface". UKnowledge, 2015. http://uknowledge.uky.edu/me_etds/57.
Texto completoClark, Ian Gauld. "Aerodynamic design, analysis, and validation of a supersonic inflatable decelerator". Diss., Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/34708.
Texto completoDavuluri, Raghava Sai Chaitanya. "Modeling of spallation phenomenon in an arc-jet environment". UKnowledge, 2015. https://uknowledge.uky.edu/me_etds/63.
Texto completoConrad, Stefan [Verfasser], Görge [Gutachter] Deerberg y Eckhard [Gutachter] Weidner. "Experimentelle Betrachtung einer Pyrolysedampfkondensation zur stofflichen Fraktionierung der flüssigen Produkte am Beispiel eines mechanisch-ablativen Schnellpyrolysesystems / Stefan Conrad ; Gutachter: Görge Deerberg, Eckhard Weidner ; Fakultät für Maschinenbau". Bochum : Ruhr-Universität Bochum, 2021. http://d-nb.info/1236813898/34.
Texto completoArnal, Bastien. "Elastographie pour le suivi des thérapies par ultrasons focalisés et nouveau concept de cavité à retournement temporel pour l'histotripsie". Phd thesis, Université Paris-Diderot - Paris VII, 2013. http://pastel.archives-ouvertes.fr/pastel-00786523.
Texto completoGuo, Ming Shin y 郭明勳. "Growth Mechanism of High-Tc Superconducting Thin Films by Laser Ablation". Thesis, 1993. http://ndltd.ncl.edu.tw/handle/26794275848008874312.
Texto completoJohnson, Stephen L. "Resonant-infrared laser ablation of polymers mechanisms and applications /". Diss., 2008. http://etd.library.vanderbilt.edu/ETD-db/available/etd-08082008-140048/.
Texto completoChee, Ana Virginia. "The mechanisms of ablation of antiviral effects of interferon by herpes simplex virus type 1 /". 2003. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pqdiss&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft_dat=xri:pqdiss:3077047.
Texto completoLin, Chia-Hsien y 林嘉嫻. "The Anti-Cancer Mechanism of Cyclin D1-Ablative Drug on Breast Cancer". Thesis, 2008. http://ndltd.ncl.edu.tw/handle/tdxjrt.
Texto completo國立中山大學
生物醫學研究所
96
Breast cancer is the fifth most common cause of cancer death in the worldwide. In the past decades, tamoxifen has been used for clinical treatment for breast cancers. The derivatives of compound thiazolidinedione (TZDs) including troglitazone (rezulin) and rosiglitazone (avandia) are also in the stages of clinical trials. But in the earlier research, some studies reported that the use of these drugs was associated with some serious side effects. Cyclin D1 plays an important role in G1/S phase cell cycle progression and in growth factor- or estrogen-induced mammary epithelial cell proliferation. Cyclin D1 overexpression is also found in high percentage (over 30%) of human breast cancers, correlating with poor prognosis. In this study, we used a cyclin D1-ablative drug VGH No.47 to reduce the expression of cyclin D1 in human breast adenocarcinoma cell line MCF-7 (ER-positive) and MDA-MB-231 (ER-negative) and to study its effect on cell proliferation. Our results demonstrated that VGH No.47 decreased the protein stability of cyclin D1. Conversely, VGH No.47 reduced cyclin D1 at both transcriptional level and protein stability in ER-negative MDA-MB-231 cells. We found that VGH No.47 caused G2/M arrested in both breast cancer cell lines. In addition, we tested whether cyclin D1-ablative drug could sensitize breast cancer cells to tamoxifen and TZDs. We expect to lower the dose of tamoxifen, troglitazone or rosiglitazone to reduce the side effects, but the results do not meet our expectation and do not exhibit synergistic effect.
Hu, Yu-Feng y 胡瑜峰. "The Association of Inflammation and the Recurrence of Atrial Fibrillation after Catheter Ablation and its Pathophysiological Mechanisms". Thesis, 2013. http://ndltd.ncl.edu.tw/handle/82747593731705456116.
Texto completo國立陽明大學
臨床醫學研究所
101
Background: Inflammation is an important mechanism in the pathogenesis of atrial fibrillation (AF). It remains unclear if inflammation is associated with the outcome of AF after catheter ablation. Furthermore, the patho-physiological process of AF recurrence and its associated cytokines and inflammatory pathways are also not clear. Methods: We enrolled prospective patients receiving catheter ablation for AF and tracked the recurrence of AF for 1 to 2 years. Different inflammation associated pathways and cytokines were screened using different methods, such as flow cytometry, real-time polymerase chain reaction (RT-PCR), and ELISA. Monocyte expression of CD36 was determined by flow cytometry. Heat shock protein 27 (HSP27), tumor necrosis factor alpha (TNF-α), interleukin 10 (IL-10), and HSP70 were detected by ELISA. High-sensitivity CRP (HsCRP) was determined using particle-enhanced immunoturbidimetry. Hemoxygenase-1 (HO-1) gene promoter polymorphisms and mRNA were determined using RT-PCR. Results: Of the screened cytokines or biomarkers, lower levels of monocyte CD36 protein and lower serum levels of HSP27 were independently associated with AF, but these variables were not associated with changes in TNF-α, IL-10, C-reactive protein, HSP70, or hemoxygenase-1 (HO-1) gene promoter polymorphisms. Monocyte CD36, HSP27, and HO-1 gene promoter polymorphisms were independently associated with AF recurrence after catheter ablation using a Kaplan–Meier analysis from different cohorts. CD36 and HSP27 were associated with different electro-anatomic properties, such as left atrial diameter and left atrial mean voltage. HSP27 levels were associated with non-pulmonary ectopies and fractionated intervals. An analysis of mRNA levels from the buffy coat revealed that CD36 levels were positively correlated with IL-10 levels but were inversely correlated with PPAR-γ and TNF-α levels. Similarly, HSP27 levels were inversely associated with TNF-α and positively correlated with IL-10, as indicated by both ELISA and mRNA, indicating the role of anti-inflammation. However, CD36 did not interact with HSP27. CD36 regulated monocyte inflammation, and HSP27 was associated with different lymphocyte levels, but not neutrophil levels. These findings suggest that chronic inflammation plays a more important role than acute inflammation. From the literature, HO-1 gene promoter polymorphisms have been associated with different inflammatory statuses. However, in the present study, we did not see an association between the number of GT repeats and CRP, IL-10, or TNF-α, implying other inflammatory pathways or alternative mechanisms such as anti-apoptosis may be involved. Conclusions: Specific inflammatory pathways such as monocyte CD36, HSP27S levels, and HO-1 gene promoter polymorphisms correlated with electro-anatomical remodeling and predicted AF recurrence after catheter ablation.
Παπαθανασίου, Ζαφειρία. "Η εφαρμογή του θερμοκαυτηριασμού με ραδιοσυχνότητες (RF ablation) στη θεραπεία καλοηθών οστικών όγκων". Thesis, 2010. http://nemertes.lis.upatras.gr/jspui/handle/10889/4102.
Texto completoTreatment of benign primary bone tumors depends on the anatomical location, symptoms, the natural history of the tumor and the morbidity of treatment and in most cases involves either simple excision or curettage although occasionally it is necessary to perform a complete excision using the same principles as for malignant tumors. CT-guided radiofrequency ablation (RFA), has emerged as minimally invasive alternative to destroy the tumor, overcome surgical difficulties and potential hazards and preserve the functional ability of the patient. The present study demonstrates the healing effect of RFA and evaluates its efficacy and safety in the treatment of osteoid osteomas, chondroblastomas and osteoblastomas. Additionally, this series compare the imaging pattern of the bone tumors prior and post RFA and correlate the results with other selected tumor parameters. MATERIAL AND METHODS From December 2003 to December 2009 a total number of 33 patients (23 male, 10 female, 11-39 years, mean: 22, 5 years) with 33 benign bone tumors were treated with RFA. Informed consent and institutional board approval were obtained. The tumors consisted of 29 osteoid osteomas, three biopsy-proved chondroblastomas and one biopsy-proved osteoblastoma. The mean maximum diameter was 7mm (range: 4-12 mm) for osteoid osteomas, 29 mm for chondroblastomas (range: 26-32 mm) and 32mm for the osteoblastoma. Lesions were located in the limbs (n: 27, 82%), the upper arm (n: 4, 12%) and two in the spine (n: 2, 6%). Intra-articular location was detected in 11(33%) tumors. Diagnosis of osteoid osteomas was base on imaging and clinical criteria. Ablation was performed using a straight rigid RF electrode in 31 tumors while a multi-tined expandable RF electrode was used in two cases of femoral chondroblastomas. Primary success rate, total secondary success rate, recurrences, complications, follow-up and statistical analysis results were assessed. RESULTS Technical success was achieved in 33 patients (33/33, 100%). Recurrence occurred in three osteoid osteomas (3/33, 9%); one intra-articular medullar lesion and two extra-articular cortical lesions at two, six and four months post RFA respectively (mean: 4 months). Failure was attributed to inadequate RF electrode positioning in the cortical lesions whilst articular damage was the main reason for pain relapse in the third intra-articular case. Primary success rate was 91% and total secondary success rate was 94%. Mean clinical follow-up period was 28 months (range: 6-70 months) for all lesions. Complications comprised of one mild thermal skin injury, one hip joint degenerative arthritis (third intra-articular failure case) and a case of septic arthritis with bony changes and cutaneous fistula, due to wound infection, which required surgical debridement. Statistical analysis of bone tumor parameters regarding 25 cases of osteoid osteomaswith available CT-follow-up, like complete, partial or absent ossification of the treated nidus, patient age and sex, tumor size and location, pre-existing calcifications, clinical outcome and CT follow-up, reached the following results (Kendall’s t-test): 1) Absence and/or minimal of post RFA ossification does not necessarily indicate clinical failure (P=0.14). 2) Detection of post RFA ossification showed an intense positive correlation with a long-lasting CT follow-up (≥ 12 months) (P= 0.014). 3) The “big” size of osteoid osteomas (>7mm) showed an intense negative correlation with the cortical (P=0.001), extra-articular (P= 0.003) and diaphyseal location (P=0.001). 4) Also, the “big” size of osteoid osteomas (>7mm) tends to correlate with the presence of calcifications (prior RFA), which represents a “maturity” marker of the tumor (P= 0.086). All three cases of chondroblastomas showed signs of internal ossification post RFA on regular imaging follow-up while the osteoblastoma did not show any imaging changes on the 6-month follow-up. On the other hand, the osteoblastoma and the remaining three cases of chondroblastomas presented an excellent post RFA clinical course without any signs of relapse. CONCLUSIONS Percutaneous RFA is a minimally invasive therapeutic option for osteoid osteomas which provides immediate pain relief and low rates of complications and recurrences. It is considered as the treatment of choice for appendicular and pelvic osteoid osteomas and for surgical recurrences as well. Biopsy is not mandatory provided that the diagnosis can be safely based on clinical and imaging grounds. The determination of an adverse clinical outcome should be based on clinical evaluation and not on the imaging pattern. The study and correlation of tumor parameters like size, location and pre-existing calcifications of osteoid osteomas can help in understanding their pathogenesis. The present study also suggests that RFA, when correctly performed, should be included in the treatment algorithm of selected cases of other benign bone tumors like chondroblastomas and osteoblastomas.
Decker, Franziska. "Mechanisms of microtubule nucleation in metaphase spindles and how they set spindle size". Doctoral thesis, 2017. https://tud.qucosa.de/id/qucosa%3A31788.
Texto completoGeorge, L. L. "Trace and minor elements in galena: a reconnaissance LA-ICP-MS study". Thesis, 2013. http://hdl.handle.net/2440/100088.
Texto completoMany minor/trace elements can substitute into the crystal lattice of galena at various concentrations. In-situ LA-ICP-MS analysis and trace element mapping are used to obtain minor/trace element data from a range of natural galena specimens aiming to enhance understanding of the governing factors that control minor/trace element partitioning. The coupled substitution Ag+ + (Bi, Sb)3+ ↔ 2Pb2+, is confirmed by data obtained, although when Bi and/or Sb are present at high concentrations (~> 0.002 mol.%), site vacancies most likely come into play through the additional substitution 2(Bi, Sb)3+ + □ ↔ 3Pb2+. Galena is the primary host of Tl in all mapped mineral assemblages. Thallium is likely incorporated into galena along with Cu through the coupled substitution: (Ag, Cu, Tl)+ + (Bi, Sb)3+ ↔ 2Pb2+. Tin can reach significant concentrations in galena, particularly when the latter formed via metamorphic recrystallisation. Tin is concentrated in galena, likely via the substitution: Sn4+ + □ ↔ 2Pb2+, involving the creation of lattice vacancies, or Sn2+ ↔ Pb2+. Tin and In concentrations show a strong positive correlation across the sample suite indicating that the availability of these elements is intimately linked in natural systems. Cadmium and minor Hg can be incorporated into galena; the simple isovalent substitution (Cd, Hg)2+ ↔ Pb2+ is inferred. Significant oscillatory compositional zoning, and lesser sector zoning of minor/trace elements (Ag, Sb, Bi, Se, Te) is confirmed, for the first time, in galena from two epithermal ores. Zoning is attributed to slow crystal growth into open spaces within the vein at relatively low temperatures. The datasets generated increase understanding of the nature and distribution of minor/trace elements in galena, and partitioning between galena and coexisting minerals. These data have several applications in the minerals industry, particularly in studies of mineral deposit genesis, ore processing and, potentially, also in mineral exploration.
Thesis (B.Sc.(Hons)) -- University of Adelaide, School of Physical Scences, 2013