Dissertations / Theses on the topic 'Bone bride'
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Duarte, Ricardo José de Jesus. "Comparative study of the techniques to bridge the bone loss in T.K.A." Master's thesis, Universidade de Aveiro, 2011. http://hdl.handle.net/10773/7649.
Full textThis thesis objective was to study the biomechanical aspects of the di erent repair techniques of bone loss in the proximal tibia, in the revision of total knee arthroplasty. We sought to speci cally evaluate how each of the di erent techniques changes the load transfer to the supporting bone, thus gauging the potential for bone resorption or fatigue failure of the supporting bone. Was also assessed, in a comparative way, the stability of each repair construction of the bone defects, relatively to the solutions without bone defects. We also sought, in this work, to evaluate the e ect of the use of intramedullary stems when associated to di erent techniques. For this purpose, as a rst step, we tried to perform a detailed analysis of the knee joint in its anatomical and biomechanical aspects, with special focus on arthroplasty and its revision process. We selected the knee prosthesis P.F.C. Sigma as an element for the realization of the comparative study. The prosthetic metal elements used in the di erent bone replacement constructions were also the same model, hemi-wedge, wedge and block total. As a complement two more bone repair techniques were also compared: using only bone cement in contrast with the use of a bovine bone graft. In the following phase experimental models were developed using the tibia in composite material, where the bone defects were created and the di erent techniques applied during "in vitro" surgeries. In order to assess the changes of load transfer and stability in the region annexed to the bone defect were placed gauges, allowing the evaluation of the models main surface deformations, as well as the use of video techniques for assessing the stability of the tibial plateau in the di erent techniques. These models were subjected to a severe case of load on the medial condyle where the defect is located, proceeding to evaluation and comparison of results of deformation and stability of the bone plate. At a later stage we proceeded to the development of nite element numerical models that seek to replicate the models evaluated experimentally. The models were subjected to two load cases, one case identical to the one applied in experimental models that allowed the validation of numerical models and another load case representing a physiological load condition during the walking cycle. The numerical models have allowed the assessment of biomechanical parameters, not eligible for evaluation before, using experimental models. Thereby the strains imposed on cortical and cancellous bone in the vicinity of the defect and in the interface with this have been analysed. These same models were compared with results obtained in experimental models in order to assess their correlation. The experimental and numerical results obtained allow us to show a good correlation between these numerical models demonstrating that they are able to faithfully replicate the behaviour of experimental models. The results obtained in both types of models show changes in load transfer and stability between the di erent types of techniques. The models with full wedge and block, on average, increased the strains on the medial side (the one with defect) of the cortical bone adjacent to the implant when compared with the bone and cement graft model and metallic hemi-wedge. However is during the construction with bovine bone graft that takes place the maximum increment of strain in cortical bone, on the medial side. These increases observed in the cortical bone for larger buildings is opposite to the behavior observed in the cancellous bone at the implant interface, in which case these constructions originate a reduction of deformation on the solution without defect. So the more invasive solutions potentiate the risk of fatigue damage in cortical bone and simultaneously increase the risk of bone resorption in the adjacent cancellous bone. In terms of stability only the metallic block implant proved to be signi cantly more stable than the other techniques. The additional stability provided by stems was felt only in less invasive constructions with the use of bone cement and hemi-wedge. The experimental and numerical results obtained allow us to show a good correlation between these numerical models demonstrating that they are able to faithfully replicate the behaviour of experimental models. The results obtained in both types of models show changes in load transfer and stability between the di erent types of techniques. The models with full wedge and block, on average, increased the strains on the medial side (the one with defect) of the cortical bone adjacent to the implant when compared with the bone and cement graft model and metallic hemi-wedge. However is during the construction with bovine bone graft that takes place the maximum increment of strain in cortical bone, on the medial side. These increases observed in the cortical bone for larger buildings is opposite to the behavior observed in the cancellous bone at the implant interface, in which case these constructions originate a reduction of deformation on the solution without defect. So the more invasive solutions potentiate the risk of fatigue damage in cortical bone and simultaneously increase the risk of bone resorption in the adjacent cancellous bone. In terms of stability only the metallic block implant proved to be signi cantly more stable than the other techniques. The additional stability provided by stems was felt only in less invasive constructions with the use of bone cement and hemi-wedge.
Nesta tese foi objectivo estudar os aspectos biomecânicos das diferentes técnicas de colmatação de perda óssea na tibia proximal aquando da revisão da artroplastia total do joelho. Procurou-se especi camente avaliar como cada uma das diferentes técnicas altera a transferência de carga ao osso de suporte, aferindo assim potenciais riscos de reabsorção óssea ou mesmo falha por fadiga do osso de suporte. Foi também avaliada de uma forma comparativa a estabilidade de cada construção de colmatação do defeito relativamente à solução sem defeito ósseo. Procurou-se também nesta tese avaliar o efeito da utilização da haste intramedular quando associada às diferentes técnicas. Para o efeito numa primeira fase procurou-se realizar uma analise detalhada à articulação do joelho na sua vertente anatómica e biomecânica com especial enfoque na artroplastia e no processo de revisão desta. Foi seleccionada a prótese do joelho P.F.C. Sigma como elemento para a realização do estudo comparativo, os elementos protésicos metálicos utilizados nas diferentes construções da substituição óssea foram também do mesmo modelo; hemi-cunha, cunha total e bloco. Em complemento foram também comparadas mais duas técnicas de colmatação óssea; uma com recurso apenas ao cimento ósseo e outra com a utilização de um enxerto de osso bovino. Na fase seguinte desenvolveram-se modelos experimentais com recurso à tibia em material compósito, onde os defeitos ósseos foram gerados e as diferentes técnicas de colmatação aplicadas através da realização de cirurgias "in-vitro". A m de aferir as alterações de transferência de carga e estabilidade foram colocados extensometros na região anexa ao defeito permitindo a avaliação das deformações principais na superfície dos modelos, assim como recorreu-se a utilização de técnicas de vídeo para avaliação da estabilidade do prato tibial nas diferentes técnicas. Estes modelos foram submetidos a um severo caso de carga no condilo medial onde se situa o defeito, tendo-se procedido à avaliação e comparação dos resultados das deforma ções no osso e estabilidade do prato. Numa fase posterior procedeu-se ao desenvolvimento de modelos numéricos de elementos nitos que procuram replicar os modelos avaliados experimentalmente. Este modelos foram submetidos a dois casos de carga, um idêntico ao aplicado nos modelos experimentais que permitiu a validação destes modelos numéricos e um outro caso de carga representativo de uma condição de carga mais siológica durante o ciclo de marcha. Este modelos numéricos permitiram a avaliação de parâmetros biomecânicos não passíveis de avaliação com recurso aos modelos experimentais anteriores. Foram assim analisadas as deformações impostas aos osso cortical e esponjoso na vizinhança do defeito e na interface com este. Estes mesmos modelos foram comparados com os resultados obtidos nos modelos experimentais de forma a avaliar a sua correlação. Os resultados experimentais e numéricos obtidos permitiram evidenciar boa correlação entre estes demonstrando que os modelos numéricos são capazes de replicar com delidade o comportamento dos modelos experimentais. Os resultados obtidos em ambos os tipos de modelos evidenciam alterações de transferência de carga e estabilidade entre os diferentes tipos de técnicas. Os modelos com cunha total e bloco aumentaram em média as deformações no lado medial (lado do defeito) do osso cortical adjacente ao implante quando comparados com o modelo de colmatação só com cimento ósseo e hemicunha. No entanto, os valores de máximos de incremento de deformação no osso cortical no lado medial ocorram para a construção com enxerto ósseo bovino. Estes incrementos observados no osso cortical para as construções de maior dimensão é oposto ao comportamento observado no osso esponjoso na interface com o implante, pois neste caso estas construções originam uma redução das deformações relativamente à solução sem defeito. Assim, temos que as soluções mais invasivas potenciam o risco de dano por fadiga óssea do osso cortical e simultaneamente potencializam o risco de reabsorção óssea no osso esponjoso adjacente. Em termos de estabilidade apenas a construção com bloco se revelou signi cativamente mais estável que as restantes técnicas. O efeito adicional de estabilidade das hastes apenas se fez sentir nas construções menos invasivas com recurso ao cimento ósseo e hemi-cunha.
Sumbalová, Lenka. "Bioinformatický nástroj pro návrh disulfidických můstků v proteinové struktuře." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2016. http://www.nusl.cz/ntk/nusl-255430.
Full textShearrer, Andrew Joseph. "Sustainable and durable bridge decks." Thesis, Kansas State University, 2014. http://hdl.handle.net/2097/17646.
Full textDepartment of Civil Engineering
Robert J. Peterman
Epoxy polymer overlays have been used for decades on existing bridge decks to protect the deck and extend its service life. The polymer overlay’s ability to seal a bridge deck is now being specified for new construction. Questions exist about the amount of drying time needed to achieve an acceptable concrete moisture content to ensure an adequate bond to the polymer overlay. Current Kansas Department of Transportation (KDOT) specifications for new bridge decks call a 14 day wet curing period followed by 21 days of drying (Kansas DOT, 2007) If not enough drying is provided, the moisture within the concrete can form water vapor pressure at the overlay interface and induce delamination. If too much drying time is provided projects are delayed, which can increase the total project cost or even delay overlay placement until the next spring. A testing procedure was developed to simulate a bridge deck in order to test the concrete moisture content and bonding strength of the overlay. Concrete slabs were cast to test typical concrete and curing conditions for a new bridge deck. Three concrete mixtures were tested to see what effect the water –cement ratio and the addition of fly ash might have on the overlay bond strength. Wet curing occurred at 3 different temperatures (40°F, 73°F, and 100°F) to see if temperature played a part in the bond strength as well. The concrete was then allowed to dry for 3, 7, 14, or 21 days. Five epoxy-polymer overlay systems that had been preapproved by KDOT were each used in conjunction with the previously mentioned concrete and curing conditions. After, the slabs were setup to perform pull-off tests to test the tensile rupture strength. The concrete slabs with the different epoxy overlays were heated to 122-125°F to replicate summer bridge deck temperatures. Half of the pull-off tests were performed when the slabs were heated and half were performed once the slabs had cooled back down to 73°±5°F. Results from the pull-off tests as well as results from a moisture meter taken on the concrete prior to the overlay placement were compared and analyzed. Testing conditions were compared with each other to see which had a larger effect on the epoxy polymer overlay’s bond strength.
Perkins, Jake. "Concrete fluidity effects on bond of prestressed tendons for lightweight bridge girders." Thesis, Manhattan, Kan. : Kansas State University, 2008. http://hdl.handle.net/2097/1080.
Full textAtanassova, Evelina. "Should I Bridge or Should I Bond? Social Capital Strategies and Contingencies." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLH018/document.
Full textMy dissertation expands the line of inquiry of the contingent value of social capital to individual performance by raising three novel questions. In the first essay of my dissertation I focus on “How to bridge and how to bond” and propose a new theoretical framework for analyzing social capital, which deconstructs its major function beyond bridging or bonding into its substance as social relations versus position in network structure. Considering these two dimensions of social network analysis I propose four distinct sources of social capital that have different predictive value for individual achievements: bridging network, bridging relations, bonding network and bonding relations. The lead question in the second chapter of my dissertation is “When to bridge and when to bond”. Joining the research on the contingent value of social capital, I look at organization and individual level factors to predict the value of each social capital source to performance and theorize about the strategies individuals should pursue in order to achieve better performance. In the third essay I ask “Should one start with bridging or with bonding?” Building on the categorization proposed in the first chapter I investigate the most successful social capital path to on-the-job performance
DeFreese, James Michael. "Glass Fiber Reinforced Polymer Bars as the Top Mat Reinforcement for Bridge Decks." Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/36289.
Full textMaster of Science
Markosian, Nicholas. "Calcium Sulfoaluminate Cement Concrete for Prestressed Bridge Girders: Prestressing Losses, Bond, and Strength Behavior." DigitalCommons@USU, 2019. https://digitalcommons.usu.edu/etd/7474.
Full textHockerman, Samantha Jo. "Laboratory testing of precast bridge elements, verification of post-tensioning forces and construction documentation of the Boone County IBRC accelerated bridge replacement project." [Ames, Iowa : Iowa State University], 2007.
Find full textHaramis, John Emmanuel II. "Investigation of Bond Strength and Watertightness of Asphalt Concrete Wearing Surfaces for Timber Bridge Decks." Thesis, Virginia Tech, 1997. http://hdl.handle.net/10919/36954.
Full textThe testing regime used in this research to evaluate watertightness and bond performance incorporated three parameters: three waterproofing membranes, two wood preservative treatments, and two environmental degradation conditions induced by temperature cycling in a moisture saturated condition. Control groups were evaluated for each study parameter and duplicate specimens were prepared and tested for each of the study parameters. A total of 160 specimens were constructed and tested.
Watertightness of each system was determined by measuring the electrical impedance across a test specimen perpendicular to the direction of bond orientation in the pavement. The bond strength between each material of the paving systems was assessed using a shear test apparatus designed and built for this study.
In addition to the laboratory constructed specimens, three drilled cores were taken from a bridge located on Creekside Drive in East Pennsboro Township, Pennsylvania. The deck was constructed using the new design proposed in this research and each core was tested for watertightness and bond strength.
Results of watertightness testing indicated that low temperature environments appear to be most detrimental to system integrity in both the existing and proposed paving system configurations examined in this research. In general, each membrane appeared to perform equally well in the proposed paving system configuration as well as with all of the wood preservative treatments used in the existing pavement system.
Bond strength between asphalt and wood with no membrane was observed to be nonexistent whether or not any preservative treatment was present. The placement of a membrane between these two layers did, however, result in a significant increase in bond strength because each membrane tested was able to adhere to the wood base better than the asphalt overlay. This gain is strength was significantly offset when petroleum solvent based preservative treatments were present in the wood substrate. Protectowrap M400 membrane performed slightly better than the other membranes when used with untreated wood, but all of the membranes performed equally when preservative treatments were present. The highest interlayer bond strengths (asphalt/asphalt or asphalt/wood) observed in this research occurred when asphalt concrete surface material was placed directly on top of asphalt concrete base material, however the addition of a membrane between the asphalt lifts consistently reduced this strength. The results of bond testing indicate that the proposed system will perform better in terms of shoving in the pavement overlay. Based on bond test results of cores taken from the Creekside Drive bridge, it appears that a shear strength greater than 25 psi after 200 low temperature exposure cycles will provide acceptable paving system performance in a low temperature (0-40ºF) environment.
Master of Science
Atta, M. O. A. "A comparative study of the bond strength of chemical and mechanical retention systems for direct bonded bridge retainers." Thesis, King's College London (University of London), 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.320471.
Full textZhang, Huiying. "An Evaluation of the Durability of Polymer Concrete Bonds to Aluminum Bridge Decks." Thesis, Virginia Tech, 1999. http://hdl.handle.net/10919/31655.
Full textMaster of Science
Bowers, Ryan Paul. "Laboratory testing of full-depth precast, prestressed concrete deck panels used in the Boone County IBRC accelerated bridge replacement project." [Ames, Iowa : Iowa State University], 2009.
Find full textLarson, Kyle Hatch. "Evaluating the time-dependent deformations and bond characteristics of a self-consolidating concrete mix and the implication for pretensioned[sic] bridge applications." Diss., Manhattan, Kan. : Kansas State University, 2006. http://hdl.handle.net/2097/219.
Full textPeiris, Nisal Abheetha. "STEEL BEAMS STRENGTHENED WITH ULTRA HIGH MODULUS CFRP LAMINATES." UKnowledge, 2011. http://uknowledge.uky.edu/gradschool_diss/204.
Full textPham, Keimann, and Jesse Olsson. "Bestämning av skjuvhållfasthet med vridprovning för pågjutna betongkonstruktioner." Thesis, KTH, Byggteknik och design, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-136826.
Full textDamages and wear on concrete bridges are due to de-icing salt or salt water, reinforcement corrosion and repeated freeze-thaw cycles in combination with increasing traffic loads. The most common repair operation for these types of damages is to remove the deteriorated concrete and replace it with a new concrete overlay. To evaluate how well a bonded concrete overlay is, the bond strength between the new and old concrete has to be determined. The most widely used method for this purpose is the so-called pull off test to determine the tensile bond strength. In practice however the shear bond strength is of greater interest and is therefore approximated on the basis of tensile bond strength, but with a torsion test the shear bond strength can be directly determined. The purpose of this study is to investigate the reliability of the torsion test to determine the shear bond strength in a more direct and accurate manner. The thesis examines the reliability of the torsion test to determine the shear bond strength with the pull off test as a reference. The study includes eight parallel tests of pull off and torsion tests where the lowest measured shear bond strength is compared with the calculated design value of shear bond strength according to EC2. The work is done in connection with the Spårväg city project at Sergels torg, Stockholm, in collaboration with the Traffic Administration Office in Stockholm and CBI, the Swedish Cement and Concrete Research Institute. The results of the tests showed that the failures in the interface between new and old concrete, which are of interest, were more common for pull off tests than torsion tests where only two of the eight test samples showed failure in the interface. The wide scatter of the measured values is a consequence of the low number of failures in the interface. The mean value of the tensile bond strength was 1,43 MPa, which indicates good bond strength. The shear bond strength however made with torsion tests show a mean value of only 1,61 MPa. Lower than the expected value of about twice the tensile bond strength of 2,86 MPa. Interestingly, the lowest measured value of the shear bond strength of 0,83 MPa was unusually low, but still higher than the calculated design value of shear bond strength of 0.59 MPa according to EC2. The study has shown that torsion test is a difficult method for determining the shear strength of the bond between the new and old concrete. The reason for this is mainly due to three factors, the low number of tests, the large scatter of values, and the difficulty to interpret failures of the test samples. Despite this the torsion test seems to be a future method for structural engineers and contractors as a tool to determine shear strength for repaired concrete structures in general and not only the shear bond strength.
Bode, Brid [Verfasser], Ilona [Akademischer Betreuer] Ostner, Julia [Akademischer Betreuer] Fischer, and Walter [Akademischer Betreuer] Paulus. "Genetic interaction of Per- and Dec-genes in the mammalian circadian clock / Brid Bode. Gutachter: Ilona Ostner ; Julia Fischer ; Walter Paulus. Betreuer: Ilona Ostner." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2011. http://d-nb.info/1043024107/34.
Full textElgabbas, Fareed Mahmoud. "Development and structural testing of new basalt fiber-reinforced-polymer (BFRP) bars in RC beams and bridge-deck slabs." Thèse, Université de Sherbrooke, 2016. http://hdl.handle.net/11143/8734.
Full textAbstract: The advances in fiber-reinforced-polymer (FRP) technology have spurred interest in introducing new fibers, such as basalt FRP (BFRP), which has the potential to offer an efficient solution when implemented in concrete structure, such as corrosion resistant, durable and cost-effective. Furthermore, the available design codes and guides do not provide any recommendations for the use of BFRP bars since fundamental studies and relevant applications are still limited. Therefore, investigations are needed to characterize and understand the behavior of BFRP bars in concrete members. Consequently, the main objectives of this experimental investigation are to evaluate the short- and long-term characteristics of newly developed BFRP bars, as well as evaluate the structural performance of these new bars as internal reinforcement for concrete beams and bridge-deck slabs to introduce these new reinforcing bars to the design codes and guides. The experimental tests were completed through three parts. The first part was conducted on three newly developed BFRP bars and tendons to investigate their physical and mechanical properties. Durability and long-term performance were assessed by conditioning the BFRP bars in an alkaline solution simulating the moist concrete environment to determine their suitability as internal reinforcement for concrete elements. Thereafter, the properties were assessed and compared with the unconditioned (reference) values. The second part of this study was conducted on seven full-scale edge-restrained concrete bridge-deck slabs simulating actual slab-on-girder bridge-deck that is commonly used in North America to evaluate the performance of concrete bridge-deck slabs reinforced with BFRP and steel bars. The deck slabs measured 3000 mm long × 2500 mm wide × 200 mm deep. The slabs were tested up to failure under single concentrated load acting on the center of each slab simulating the footprint of sustained truck wheel load. The punching shear capacities were predicted using the available provisions, and compared with the experimental results. The third part of this study included testing of fourteen concrete beams of 3100 mm long × 200 mm wide × 300 mm deep to investigate the flexural behavior and serviceability performance of sand-coated and ribbed BFRP bars in concrete beams. The beams were tested under four-point bending over a clear span of 2700 mm until failure. The results are introduced and discussed in terms of cracking behavior, deflection, flexure capacity, and failure modes. In addition, the bond-dependent coefficient (kb) of the BFRP bars was determined and compared with the recommendations of the current FRP design codes and guides. The findings of this study concluded the feasibility of producing BFRP bars meet the requirements of the current FRP standards. Also, the test results revealed that the BFRP bars had good mechanical behavior and could be placed in the same category as grade II and grade III GFRP bars. Moreover, the behavior of the concrete bridge-deck slabs and beams reinforced with BFRP bars was quite similar to the counterparts reinforced with glass- and carbon-FRP bars and the available FRP provisions are applicable for BFRP bars. The beam test results yielded an average bond-dependent coefficient (kb) of 0.76±0.03 and 0.83±0.03 for the sand-coated and ribbed BFRP bars, respectively.
Yang, Kaiyuan. "Substitution Chemistry of the Cobalt Complexes [Co₂(CO)₆(PhC≡CR) (R=Ph, H) and PhCCo₃(CO)₉] with the Diphosphine Ligands [Bis(diphenylphosphino)maleic Anhydride (BMA) and (Z)-Ph₂PCH=CHPPh₂]. Reversible Chelate-to-Bridge Diphosphine Ligand Exchange, Phosphorus-Carbon Bond Cleavage and Phosphorus-Carbon Bond Formation." Thesis, University of North Texas, 1994. https://digital.library.unt.edu/ark:/67531/metadc279206/.
Full textHussein, Husam H. "Analysis and Design of Ultra-High-Performance Concrete Shear Key for PrecastPrestressed Concrete Adjacent Box Girder Bridges." Ohio University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1522147809016232.
Full textMongon, Mauricio Leal Dias 1977. "Técnicas de otimização de cotos em amputações transtibiais = proposta de um novo retalho osteoperiosteal para ponte ossea = Cortical tibial osteoperiosteal flap technique to achieve a bony bridge during transtibial amputation of adults." [s.n.], 2014. http://repositorio.unicamp.br/jspui/handle/REPOSIP/312519.
Full textTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Ciências Médicas
Made available in DSpace on 2018-08-25T22:20:14Z (GMT). No. of bitstreams: 1 Mongon_MauricioLealDias_D.pdf: 3191083 bytes, checksum: 7d82ec3811a7941ce0efb53f33c4ecea (MD5) Previous issue date: 2014
Resumo: Introdução: A amputação, especialmente dos membros inferiores, é um procedimento cirúrgico antigo que permite excelentes resultados quando realizada nas indicações apropriadas. Na década de 1940 , Ertl desenvolveu uma técnica reprodutível para amputação transtibial com o princípio de osteomioplastia , que restaurou a pressão intra-óssea por meio da obliteração do canal medular e ampliou a área de apoio terminal , formando uma ponte óssea entre a fíbula e a tíbia distais (sinostose). Objetivos: O objetivo deste estudo foi investigar a eficácia de uma modificação da técnica original Ertl, em que um retalho pediculado osteoperiosteal é usado para formar a ponte óssea na amputação transtibial em adultos . Resultados: Todos os nove pacientes apresentaram cotos indolores e capazes de apoio terminal total em 24 semanas pós-operatório. Conclusão: A construção de um retalho pediculado tibial osteoperiosteal cortical para alcançar uma ponte óssea durante a amputação transtibial é um procedimento seguro e eficaz que proporciona um coto estavel e indolor que permite apoio terminal. Trata-se de uma opção útil para pacientes jovens , atletas e pacientes com grande demanda física
Abstract: Background: Amputation, especially of the lower limbs, is an ancient surgical procedure that gives excellent results when conducted under the appropriate conditions. In the 1940s, Ertl developed a reproducible technique for transtibial osteomyoplastic amputation, which restored the intraosseous pressure through canal obliteration and expanded the area of terminal support by forming a bony bridge between the fibula and distal tibia. Objectives: The aim of this study was to investigate the effectiveness of a modification of the original Ertl technique, whereby a cortical tibial osteoperiosteal flap technique is used to achieve a bony bridge during transtibial amputation in adults. Results: All of the patients had stumps that were painless and able to bear the total terminal weight at 24th week post-surgery. Conclusion: The construction of a cortical tibial osteoperiosteal flap to achieve a bony bridge during transtibial amputation is a safe and effective procedure that provides a strong and painless stump that is terminal weight-bearing. This constitutes a useful option for young patients, athletes, and patients with high physical demands
Doutorado
Fisiopatologia Cirúrgica
Doutor em Ciências
Lima, Lívia Bonjardim. "Impacto do número de implantes empregados em protocolos mandibulares - Revisão sistemática." Universidade Federal de Uberlândia, 2017. https://repositorio.ufu.br/handle/123456789/18207.
Full textPurpose: To assess edentulous patients rehabilitated by implant-supported mandibular full-arch bridges and to analyze the impact of the different number of implants used on implant survival rate, bone loss around the fixtures and prosthesis survival rate. Material and methods: This systematic review followed PRISMA guidelines and was registered on PROSPERO (registration number CRD42016048523). PubMed/MEDLINE electronic database was searched for articles published up until July 17th, 2016 without restrictions about publication year and aimed to answer the following question in PICO format: “In edentulous patients, full arch-bridges supported by three implants, compared to those with different number of implants, show satisfactory implant survival rate, bone loss and prosthesis survival rate?” Evidence level of studies were evaluated according to OCEBM e the methodological quality by MINORS scale and Cochrane Risk of Bias Tool. Descriptive statistics was performed when applicable. Implant survival curves were constructed with Kaplan-meyer method and marginal bone loss was analyzed with kruskal-Wallis, Dunn’s and Mann Whitney tests. Results: 21 studies were enrolled. Overall, 4712 implants and 1245 implant-supported fullarch bridges were examined in 1245 patients. Results were grouped on categories based on the number of fixtures on each patient: Group 1 (three implants) showed an implant survival rate of 90%, Group 2 (four implants) presented 95% and the Group 3 (five implants) reached the lowest implant survival rate (74%). Group 1 and Group 3 showed the lowest values of first year bone loss (0.73 and 0.70 mm respectively), statistically significant different of Group 2 that registered median = 1,31mm (p = <0.001). Conclusion: Despite of the limitations regarding the lack of high level of evidence studies and the methodology of MeSH terms research itself, it was concluded that full archbridges supported by three implants show satisfactory implant survival rate and first year bone loss. The prosthesis survival rate, however, was inferior to the other groups and this suggests a bigger follow-up of these rehabilitations with the aim of clarifying data and search for solutions.
Dissertação (Mestrado)
Sajedi, Siavash. "RELIABILITY-BASED DESIGN OPTIMIZATION OF CORROSION MANAGEMENT STRATEGIES FOR REINFORCED CONCRETE STRUCTURES." University of Akron / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=akron1503333406583485.
Full textEmmens, Joanne. "The animal-human bond in the psychotherapy relationship a bridge towards enhanced relational capability : a dissertation submitted to Auckland University of Technology in partial fulfilment of the degree of Master of Health Science in Psychotherapy, Auckland University of Technology, 2007." Click here to access this resource online, 2007. http://hdl.handle.net/10292/657.
Full textMacsai, Carmen Elizabeth. "Cellular and molecular mechanisms involved in the repair of the injured growth plate in young rats." Thesis, 2012. http://hdl.handle.net/2440/77097.
Full textThesis (Ph.D.) -- University of Adelaide, School of Paediatrics and Reproductive Health, 2012
Pan, Yue Ming. "Tensile bond failures of resin-bonded bridge adhesives." 1986. http://books.google.com/books?id=5aY9AAAAMAAJ.
Full textLIN, ZHI-SHENG, and 林志聲. "Photoelastic stress analysis on alveolar bone of abutment teeth in long span bridge restorations." Thesis, 1991. http://ndltd.ncl.edu.tw/handle/52986022393839138346.
Full text黃全榮. "Bridge and Bond Link in Complex Networks: Detection, Analysis and Applications." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/69064907950588268673.
Full text國立交通大學
多媒體工程研究所
98
A concept of strong-ties and weak-ties played an important role in complex network studies. However, different researcher would face following problem in defining strong or weak of links: (1) Ambiguous definition between strong and weak, and (2) Clear definition of limit between strong and weak but link is either strong-tie or weak tie (dichotomy method). We considered that characteristic of links varies in different network layers (hierarchy property). Some links have obvious influence on information transmission in local area, but have no effect on information transmission in global scale; and some link have significant influence on information transmission from local to global scale. To avoid ambiguous definition and dichotomy method when quantifying links, we applied characteristic of links to propose the concept of bridge link and bond link, and designed an algorism which can detect varies characteristic of links in the different network layers according to topology properties and statistically significant, then classify links into four types:Global bridge link, N degree bridge link, Bond link, and Sink bridge link. In this paper, we observed the characteristic of links in different layers under three real networks, and realized variation in properties of every links from local to global view, then classified links into different types according to the algorism. We can describe the topology structure and specific dynamic properties of networks by means of the proportion of different link types. Ultimately, we proposed three applications based on hierarchy property of links and the proportion of different link types: (1) find community structure in complex network; (2) complex network clustering; (3) analyzing the correlation between real-world network and theoretic network on topology structure. The results demonstrated that the concept we proposed not only led to decent results on these applications, but also resolved different problems with the consistent methodology. By analyzing and realizing hierarchy property of links, researchers in many fields of science will have a better understanding of design principle or evolution principle beyond complex network.
Shih-Jung, Lo. "Control of Hydrogen Bond Strengths in Donor-Bridge-Acceptor Three-Component Systems: The Effects of Bridge Structures and Substituents." 2003. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0021-2603200719133129.
Full textLo, Shih-Jung, and 駱思融. "Control of Hydrogen Bond Strengths in Donor-Bridge-Acceptor Three-Component Systems: The Effects of Bridge Structures and Substituents." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/87668584466263343011.
Full text國立臺灣師範大學
化學研究所
92
The importance of hydrogen bonding has prompted us to investigate systems in which the strengths of hydrogen bonds can be modulated at will by external stimuli. Three-component systems consisting of a hydrogen-bonding site (electron donor), a bridge, and a reaction center (electron acceptor) have been designed to achieve this goal of hydrogen-bonding modulation. When the reaction center was protonated, a signal was sent out to the other end of the three-component molecule via intramolecular charge transfer (ICT) and thus affected the binding ability of the binding site. It has been found that the constituents of the bridge greatly influence the efficiency of remote signal communication between the reaction and binding centers. In the current theoretical study, we focused on the carbon-based conjugated bridges and studied the effects of bridge structure and substituents on signal transduction. It was found that the quinoidal bridges or bridges with cyano substitutions near the reaction center were more effective than the parent unsubstituted transoid (CH=CH)3 bridge. For bridges such as (CR1=CR2)n or (CR1=CR1-CR2=CR2)n, signal reduction due to longer bridge lengths could be minimized if R2 are substituted with electron-withdrawing substituents such as F and CN. Finally, the (C(CN)=C(CN))n bridges are signal amplifying, i.e., longer bridge lengths cause stronger binding change at the binding site.
RAMESHNI, RAMIN. "INNOVATIVE HYBRID FRP/STEEL SPLICE DETAILS FOR MODULAR BRIDGE EXPANSION JOINTS." Thesis, 2011. http://hdl.handle.net/1974/6896.
Full textThesis (Ph.D, Civil Engineering) -- Queen's University, 2011-11-30 16:53:07.385
Onilov, Oxana. "To Bridge or to Bond? Exploring the Impact of Facebook Use on Protest Participation in Moldova." Thesis, 2020. http://hdl.handle.net/10453/142277.
Full textAlthough there has been a considerable amount of literature exploring the potential of social media for protest participation, only a few studies have explored this in less-established democracies such as the post-Soviet space. This study addresses this gap by examining the impact of Facebook use and online social capital on offline protest participation through the case of the post-Soviet Moldova: a hybrid state with a politically monopolised media, but a relatively uncensored internet. Specifically, it analyses the Moldovan protests against the governing political elites of 2015. The thesis aims to explore how the media and political contexts affect the relationship between social media, social capital and protest participation. In order to achieve this, a mixed methods research design was adopted in this thesis. This design combines both quantitative and qualitative data collection and analysis. The first quantitative phase consisted of a web survey that was administered through Facebook messenger and completed by protesters. The data were used to examine statistically the relationship between social media, online social capital and protest participation. The second qualitative phase consisted of semi-structured interviews with protesters and activists. Thematic analysis of data allowed to explain quantitative results in more depth. The findings of the two phases demonstrated that Facebook use had an impact on protesters’ participation; however, the contribution was small, and its significance lay in the dialogic relationship with other factors, such as television and offline social ties. First, the impact of Facebook on participation was mediated by online bridging social capital, the type of social capital that is missing or considered low in many post-Soviet countries. In a politically monopolised media context, the development of online bridging social capital allowed people to connect with a large and diverse network of actors; access novel and alternative information; find mobilising and political knowledge; form an opinion; and construct a collective identity, all significant antecedents of protest participation. However, the impact was small because it mainly described the post-Soviet young generation, the cohort that less engaged in the protests. The study also showed that the relationship between social media and protest resulted to be complex and its mobilising potential mainly rested on integrating and bridging online and offline, as well as other media channels. These elements were mutually constitutive and together emphasised the ways in which Facebook could support protest engagement. These results can inform broader theories about protest participation and digital activism in the post-Soviet space, which is vital when understanding non-Western contexts.
Huang, Yi-Ying, and 黃怡螢. "Remote Control of Hydrogen Bond Strengths in Donor-bridge-Acceptor Systems: The Effects of Torsion and Metalation." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/97844119708803392267.
Full text國立臺灣大學
化學研究所
93
Remote control of hydrogen bond strengths can be modulated in a three-component system consisting of a hydrogen bonding site (pyrrole), a conjugated bridge and a reaction center (imine). Protonation of the reaction center can trigger intramolecular charge transfer thus altering the binding ability of the remote hydrogen-bonding site. The signaltransduction from the reaction center to the hydrogen-bonding site can be easily observed. In the first part of the study, we investigated the effect of non-planarity in the π-conjugated system has on the binding strength in the three-component system. Computational study showed that the torsion angle between the binding site and the bridging unit could greatly influence the remote signal communication in our three-component system. Dihedral angle drive calculations on the hydrogen-bonding site were performed to show how the binding energies behaved as the torsion angle is varied. The results showed decay in the binding strength and transduction sensitivity as the torsion angle is increased. Small decrease in the binding energies is observed when the torsion angle is within 45°, so that intramolecular charge transfer is not seriously affected by small distortion in the torsion angle. When we compare the CH=CH bridge and N=N bridge, the N=N bridge, which displays more efficient charge-transfer ability than the CH=CH bridge in planar configuration, is less affected by the variation of the torsion angle, as long as the torsion angle is within 30°. In general, the decrease of binding energy in the α-systems is slightly more than the β-systems as the three-component systems become nonplanar. In the second part of the study, we observed the extent of charge transfer that was induced by metalation and compared it with protonation-induced charge transfer. We studied four three-component systems: system A (pure CH=CH-CH=CH bridge), system B (with two substituted CN groups in the CH=CH-CH=CH bridge), system C (with two substituted CN groups in the reaction center), and system D (with four substituted CN groups in the reaction center). The results showed that the abilities of charge transfer and sensitivity for metalation with M2+ ions are similar to protonation in all four systems. However, the abilities of charge transfer and sensitivity for metalation with M+ ions are very weak and are similar to the neutral state. The binding energies of different metals with the same oxidation state are similar (Ru2+ > Zn2+ = Mg2+ ; Li+ > Na+). The strengths of binding energies ordered from high to low observed in the four systems are system B > system D > system C > system A and sensitivities ordered from high to low in four systems are system D > system C > system B > system A. When we observed the bridge length effect on the four systems, the charge-transfer ability of system B is the least affected as the length of the bridge increase. Our studies have provided great insights in the understanding of remote hydrogen bond communication in our three-component systems and they could provide guidelines for the synthetic design of these materials.
Chen, Wei-hao, and 陳韋豪. "Remote Control of Hydrogen Bond Strengths in Donor-Bridge-Acceptor Systems : The Effects of Metalation on Three-Component Porphyrin and Heteroporphyrin Systems." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/99802500891688325236.
Full text國立中央大學
化學研究所
97
Remote control of hydrogen bond strengths can be modulated in a three-component system containing a hydrogen bonding site(pyrrole),a conjugated bridge and a reaction center (porphyrin). Metalation of the reaction center can trigger intramolecular charge transfer(ICT), thus altering the binding ability of the remote hydrogen-bonding site. In our computational study, we have investigated two topics. The first one is to study the effect of metalation in the porphyrin three-component systems with different bridge positions. In this case, we have found that the porphyrin ring does not induce ICT in the metalated states, so we changed the reaction center to heteroporphyrins. Remote control of hydrogen bond strengths was successfully achieved with heteroporphyrins. The second topic is to construct two different types of multiple-way control systems which have multiple binding sites controlled by one metalation center. One has the similar binding strengths at all binding sites and the other has different binding strengths. We also compare the effectiveness of metalation in terms of remote control in single-way and multiple-way systems.
Samant, Rahul G. "Substrate Transformations Promoted by Adjacent Group 8 and 9 Metals." Phd thesis, 2009. http://hdl.handle.net/10048/745.
Full textBüschken, Meike. "Morphometrische und biomechanische Untersuchung der Sehnen-Knochen-Verbindung bei anatomischer Rekonstruktion der Rotatorenmanschette mittels der sogenannten Fadenbrücken-Technik am Tiermodell." Doctoral thesis, 2011. http://hdl.handle.net/11858/00-1735-0000-0006-B265-3.
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