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1
Canino, Michael Francis. "Shunkan: Genesis of a Narrative." Thesis, The University of Arizona, 1995. http://hdl.handle.net/10150/560508.
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Sullivan, Regina. "The Relationship between Ventriculoperitoneal Shunts and Shunt Revisions versus Visual Complaints among Patients with Spina Bifida in the Arkansas Spina Bifida Research Project." Digital Archive @ GSU, 2012. http://digitalarchive.gsu.edu/iph_theses/231.
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Many patients with Spina Bifida suffer from hydrocephalus as a complication of their developmental disability and surgeons commonly treat this condition with ventriculoperitoneal shunts. Surgeons have speculated for years that these shunts may cause some type of visual disturbance because of their close proximity to the visual pathways in the brain. Little research has been done, however, to support or discourage this commonly held belief. Questions and data from the Arkansas Spina Bifida Research Project were used to examine whether ventriculoperitoneal (VP) shunts and VP shunt revisions increase reports of visual complaints for the individuals participating in this research project. This cross sectional design used responses to the vision questions from the 2005 Arkansas Spina Bifida Questionnaire. Results showed a 333% increase in reported vision complaints after receiving a VP shunt, but no significance with the increase in vision complaints for those having three or more VP shunt revisions. Females were 50% to 60% less likely to report vision complaints in both multivariate linear logistic models. While these results indicate the potential relationship between VP shunts and vision concerns, they must be viewed cautiously in light of study limitations due to the small sample size, selection bias, and study design.
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Boyd, Louise Anne. "Art, sex, and institutions : defining, collecting, and displaying shunga." Thesis, University of Glasgow, 2016. http://theses.gla.ac.uk/7546/.
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In Edo-Japan (c.1603 – 1868) shunga, sexually explicit prints, paintings and illustrated books, were widely produced and disseminated. However, from the 1850s onwards, shunga was suppressed by the government and it has largely been omitted from art history, excluded from exhibitions and censored in publications. Although changes have taken place, cultural institutions continue to be cautious about what they collect and exhibit, with shunga largely remaining a prohibited subject in Japan. Since the 1970s there has been a gradual increase in the acceptance of shunga outside Japan, as evidenced in the growing number of exhibitions and publications. The initial impetus behind this thesis was: Why and how did shunga become increasingly acceptable in Europe and North America in the twentieth century, whilst conversely becoming unacceptable in post-Edo Japan? I discuss how and why attitudes to shunga in the UK and Japan have changed from the Edo period to the present day, and consider how definitions can affect this. My research examines how shunga has been dealt with in relation to private and institutional collecting and exhibitions. In order to gauge modern responses, the 2013 Shunga: Sex and Pleasure in Japanese Art exhibition at the British Museum is used as an in-depth study – utilising mixed methods and an interdisciplinary approach to analyse curatorial and legal decisions, as well as visitor feedback. To-date there are no official or standardised guidelines for the acquisition, cataloguing, or display of sexually explicit artefacts. It is intended that institutions will benefit from my analysis of the changing perceptions of shunga and of previous shunga collections and exhibitions when dealing with shunga or other sexually explicit items in the future.
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Shuka, Romeo [Verfasser]. "Parallele adaptive Schwarmsuche für Blackbox-Probleme / Romeo Shuka." Hannover : Gottfried Wilhelm Leibniz Universität Hannover, 2019. http://d-nb.info/1197227539/34.
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Spirakis, Susan E. "Incidence of Unilateral, High Frequency, Sensorineural Hearing Loss in Shunt Treated Hydrocephalic Children Ipsilateral to Shunt Placement." Scholar Commons, 2000. https://scholarcommons.usf.edu/etd/1548.
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The purpose of this study was to investigate further the characteristics of hearing loss in ventriculoperitoneal (VP) shunted hydrocephalus. Twelve (VP) shunt treated hydrocephalus children participated in this study. The etiology of the hydrocephalus was either intraventricular hemorrhage or spina bifida. A recent neurological examination reported the shunt to be patent in each child. Audiometric examination included pure tone air conduction thresholds, tympanometry, contralateral and ipsilateral acoustic reflex thresholds and distortion product otoacoustic emissions (DPOAEʹs). A unilateral, high frequency, sensorineural hearing loss was found in the ear ipsilateral to shunt placement in 10 (83%) of the 12 shunt treated hydrocephalic children. No hearing loss was observed the ear contralateral to shunt placement. Based on the pure tone findings coupled with the decrease in DPOAE amplitude in the shunt ear, the hearing loss appears to be cochlear in nature. It is hypothesized that the cochlear hydrodynamics are disrupted as the result of fluid pressure reduction within the perilymph being transmitted via a patent cochlear aqueduct as a reaction to the reduction of CSF via a patent shunt. In addition, a concomitant brainstem involvement is evidenced in the ART pattern possibly produced by the paten shunt draining CSF from the subdural space resulting in cranial base hypoplasia.
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Njozi, Hamza Mustafa. "Critical artistry in Utenzi wa Shufaka." Universitätsbibliothek Leipzig, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-93065.
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For the past 150 years studies on Kiswahili language, literature and culture have engaged the scholarly attention of many researchers (Hauner 1979. In their analyses of Kiswahili literary works, however, most critical studies have, generally, tended to neglect the aspect of artistic design. Instead, the central focus has primarily been on two interlocking aspects of these works: (1) their content, values or thematic messages and (2) their cultural and socio-historical contexts (Dorsey 1988). This widespread tendency to undervalue the importance of artistic design in Kiswahili literary works is not surprising as it was largely promoted by some of the earlier European authorities who popularised the idea that Kiswahili literature `is not of literary interest´ and `that social, cultural, and historical commentary by anthologists are more relevant to this literature than literary study´ (Biersteker and Plane 1989:451). It is encouraging to see, however, that in recent years more and more scholars, like Mlamali (1980), Fiedel and Shariff (1986), Biersteker (1991) and Mbele (1996), to mention but a few, address issues of artistic design in their critical appraisals of Kiswahili literary works. This article is a modest attempt to follow their example by looking at Utenzi wa Shujaka as an object of design; how the poet has used the technical instruments of verbal craftsmanshjp in his bid to elicit an aesthetic response from his audience.
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Knipper, Barbara Katharina. "Operative Behandlung congenitaler zyanotischer Vitien modifizierter Blalock-Taussig-Shunt versus Kirklin-Shunt /." [S.l.] : [s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=971652627.
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Ramli, Mohd Shamir. "Investigation of circuit breaker switching transients for shunt reactors and shunt capacitors." Thesis, Queensland University of Technology, 2008. https://eprints.qut.edu.au/17822/1/Mohd_Shamir_Ramli_Thesis.pdf.
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Switching of shunt reactors and capacitor banks is known to cause a very high rate of rise of transient recovery voltage across the circuit breaker contacts. With improvements in circuit breaker technology, modern SF6 puffer circuits have been designed with less interrupter per pole than previous generations of SF6 circuit breakers. This has caused modern circuit breakers to operate with higher voltage stress in the dielectric recovery region after current interruption. Catastrophic failures of modern SF6 circuit breakers have been reported during shunt reactor and capacitor bank de-energisation. In those cases, evidence of cumulative re-strikes has been found to be the main cause of interrupter failure.
Monitoring of voltage waveforms during switching would provide information about the magnitude and frequency of small re-ignitions and re-strikes. However, measuring waveforms at a moderately high frequency require plant outages to connect equipment. In recent years, there have been increasing interests in using RF measurements in condition monitoring of switchgear. The RF measurement technique used for measuring circuit breaker inter-pole switching time during capacitor bank closing is of particular interest.
In this thesis, research has been carried out to investigate switching transients produced during circuit breaker switching capacitor banks and shunt reactors using a non-intrusive measurement technique. The proposed technique measures the high frequency and low frequency voltage waveforms during switching operations without the need of an outage. The principles of this measurement technique are discussed and field measurements were carried out at shunt rector and capacitor bank installation in two 275 kV air insulated substations. Results of the measurements are presented and discussed in this thesis.
The proposed technique shows that it is relatively easy to monitor circuit breaker switching transients and useful information on switching instances can be extracted from the measured waveforms. Further research works are discussed to realise the full potential of the measuring technique.
9
Ramli, Mohd Shamir. "Investigation of circuit breaker switching transients for shunt reactors and shunt capacitors." Queensland University of Technology, 2008. http://eprints.qut.edu.au/17822/.
Full textAbstract:
Switching of shunt reactors and capacitor banks is known to cause a very high rate of rise of transient recovery voltage across the circuit breaker contacts. With improvements in circuit breaker technology, modern SF6 puffer circuits have been designed with less interrupter per pole than previous generations of SF6 circuit breakers. This has caused modern circuit breakers to operate with higher voltage stress in the dielectric recovery region after current interruption. Catastrophic failures of modern SF6 circuit breakers have been reported during shunt reactor and capacitor bank de-energisation. In those cases, evidence of cumulative re-strikes has been found to be the main cause of interrupter failure.
Monitoring of voltage waveforms during switching would provide information about the magnitude and frequency of small re-ignitions and re-strikes. However, measuring waveforms at a moderately high frequency require plant outages to connect equipment. In recent years, there have been increasing interests in using RF measurements in condition monitoring of switchgear. The RF measurement technique used for measuring circuit breaker inter-pole switching time during capacitor bank closing is of particular interest.
In this thesis, research has been carried out to investigate switching transients produced during circuit breaker switching capacitor banks and shunt reactors using a non-intrusive measurement technique. The proposed technique measures the high frequency and low frequency voltage waveforms during switching operations without the need of an outage. The principles of this measurement technique are discussed and field measurements were carried out at shunt rector and capacitor bank installation in two 275 kV air insulated substations. Results of the measurements are presented and discussed in this thesis.
The proposed technique shows that it is relatively easy to monitor circuit breaker switching transients and useful information on switching instances can be extracted from the measured waveforms. Further research works are discussed to realise the full potential of the measuring technique.
10
Weststrate, Marnus. "LC-ladder and capacitive shunt-shunt feedback LNA modelling for wideband HBT receivers." Thesis, University of Pretoria, 2011. http://hdl.handle.net/2263/26615.
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Although the majority of wireless receiver subsystems have moved to digital signal processing over the last decade, the low noise amplifier (LNA) remains a crucial analogue subsystem in any design being the dominant subsystem in determining the noise figure (NF) and dynamic range of the receiver as a whole. In this research a novel LNA configuration, namely the LC-ladder and capacitive shunt-shunt feedback topology, was proposed for use in the implementation of very wideband LNAs. This was done after a thorough theoretical investigation of LNA configurations available in the body of knowledge from which it became apparent that for the most part narrowband LNA configurations are applied to wideband applications with suboptimal results, and also that the wideband configurations that exist have certain shortcomings. A mathematical model was derived to describe the new configuration and consists of equations for the input impedance, input return loss, gain and NF, as well as an approximation of the worst case IIP3. Compact design equations were also derived from this model and a design strategy was given which allows for electronic design automation of a LNA using this configuration. A process for simultaneously optimizing the circuit for minimum NF and maximum gain was deduced from this model and different means of improving the linearity of the LNA were given. This proposed design process was used successfully throughout this research. The accuracy of the mathematical model has been verified using simulations. Two versions of the LNA were also fabricated and the measured results compared well with these simulations. The good correlation found between the calculated, simulated and measured results prove the accuracy of the model, and some comments on how the accuracy of the model could be improved even further are provided as well. The simulated results of a LNA designed for the 1 GHz to 18 GHz band in the IBM 8HP process show a gain of 21.4 dB and a minimum NF of only 1.7 dB, increasing to 3.3 dB at the upper corner frequency while maintaining an input return loss below -10 dB. After steps were taken to improve the linearity, the IIP3 of the LNA is -14.5 dBm with only a small degradation in NF now 2.15 dB at the minimum. The power consumption of the respective LNAs are 12.75 mW and 23.25 mW and each LNA occupies a chip area of only 0.43 mm2. Measured results of the LNA fabricated in the IBM 7WL process had a gain of 10 dB compared to an expected simulated gain of 20 dB, however significant path loss was introduced by the IC package and PCB parasitics. The S11 tracked the simulated response very well and remained below -10 dB over the feasible frequency range. Reliable noise figure measurements could not be obtained. The measured P1dB compression point is -22 dBm. A 60 GHz LNA was also designed using this topology in a SiGe process with ƒT of 200 GHz. A simulated NF of 5.2 dB was achieved for a gain of 14.2 dB and an input return loss below -15 dB using three amplifier stages. The IIP3 of the LNA is -8.4 dBm and the power consumption 25.5 mW. Although these are acceptable results in the mm-wave range it was however found that the wideband nature of this configuration is redundant in the unlicensed 60 GHz band and results are often inconsistent with the design theory due to second order effects. The wideband results however prove that the LC-ladder and capacitive shunt-shunt feedback topology is a viable means for especially implementing LNAs that require a very wide operating frequency range and also very low NF over that range.Thesis (PhD(Eng))--University of Pretoria, 2011.
Electrical, Electronic and Computer Engineering
unrestricted
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Rodríguez, Cerrón Maritza. "Los Petroglifos de Shunte (Tocache - San Martín)." Master's thesis, Universidad Nacional Mayor de San Marcos, 2021. https://hdl.handle.net/20.500.12672/17892.
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La región San Martín cuenta con material arqueológico desde el Periodo Arcaico hasta
la cultura Chachapoyas. Según la Dirección Regional de Cultura de San Martín, son 176
sitios entre las provincias, conformados por petroglifos, arquitectura pre inca, depósitos de
cerámica, espacios funerarios, etc. Sin embargo, su presencia no parece generar el interés por parte de las autoridades para
su puesta en valor. Las investigaciones realizadas hasta el momento sobre el material, no ha
presentado mayor eco; puesto que los vacíos de origen cultural e histórico de la región San
Martín siguen en crecimiento. La presente es una investigación que aborda el estudio del complejo rupestre Shunte (Tocache
– San Martín) desde la mirada del paisaje cultural, relacionándolo al carácter simbólico de sus
motivos. A través de la selección y reconocimiento de los temas representados, se determina las
características formales y otras consideraciones compositivas como el estilo, la forma, el espacio,
la composición, la técnica, los materiales y la finalidad. De esta forma, se establece la relación entre los
petroglifos y el paisaje cultural, se plantea las concepciones e intereses de primeros pobladores
en la región San Martín.
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Lima, Márcia Maria Macêdo. "Infecções em dispositivos neurológicos implantáveis em crianças e adolescentes." Universidade Federal de Sergipe, 2005. https://ri.ufs.br/handle/riufs/3829.
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Coordenação de Aperfeiçoamento de Pessoal de Nível SuperiorThe management of hydrocephalus by means of a ventriculoperitoneal shunt (VPS) has, as a major threat, surgical infections. Factors, such as cause of hydrocephalus, age below six months, shunt primary insertion, trainaing curve of surgeons, conditions of antisepsis and length of the procedure contribute to the occurrence of infectious complications. The study aimed at determining the incidence, cause, site of ocurrence and clinical and laboratory manifestations of infections in the children and teenagens who underwent VPS in Hospital Gov. João Alves (HGJAF), Aracaju, SE. Fifteen patients were studied prospectively from January 2003 to October 2004. Hospital records were analised and data were obtained during hospital stay and after discharge. The results were analised through Yates Chi-square, Fisher s exact test, relative risk and odds ratio. A confidence interval of 95% was used. All patients underwent VPS because of hipertensive hydrocephalus and subsequent infection rate per procedure was 27.6%. Infection rates according to surgical risk index were 25.7% for risk 0 and 30.4% for risk 1/2 (NNISSCDC). Surgical site infection (deep and superficial) was the major complication (87.5%) with early appearance (mean 27.6 days). Fever was the most frequent sign in 13 of 16 cases. Infection related mortaliy rate was 10% (5/50). However, there was no statistical significance for cause of hydrocephalus (p = 0.858), type of procedure (p = 0.330), age at diagnosis (p = 0.926), pre-operative length of stay (p = 0.172), duration of procedure (p = 0.534, RR = 1.09, IC95% [0.6-2.0]), antibiotic prophylaxis (p = 0.567), previous use of CNS catheter (P = 0.361) and risk index (0, 1, 2) (p = 0.926, RR = 1.07, IC95% [0.76-1.49]. The present study was meant to caracterize the management of hydrocephalus at HGJAF and identify problems that could be mimimized through prevention of infectious complications.
O tratamento cirúrgico da hidrocefalia através da derivação ventrículo peritoneal (DVP), tem nas complicações infecciosas o seu maior desafio. A etiologia da hidrocefalia, crianças menores de seis meses, inserção primária do sistema de derivação, inadequada habilidade técnica da equipe cirúrgica, condições de assepsia e anti-sepsia e duração da cirurgia são alguns dos fatores de risco que contribuem para a persistência das taxas de infecção. A proposta do presente estudo foi determinar a freqüência, as causas, o sítio específico e as manifestações clínicas e laboratoriais das infecções em crianças e adolescentes após a implantação de dispositivos neurológicos no HGJAF (Aracaju-SE). Prospectivamente, foram estudados 50 pacientes entre 0 e 17 anos, submetidos a DVP (58 procedimentos), no período de janeiro de 2003 a outubro de 2004, através de levantamento de dados dos prontuários durante a internação e após a alta hospitalar. Os resultados foram analisados pelo teste do qui-quadrado, teste exato de Fischer, odds ratio e risco relativo. Foi considerado significante valor de p < 0,005. Observou-se que todas as indicações de sistema de DVP foram por hipertensão intracraniana em hidrocefalia e que a taxa de infecção por procedimento (27,6%) e as taxas de infecção de acordo com o índice de risco cirúrgico zero (25,7%) e índice de risco cirúrgico 1 e 2 (30,4%) (metodologia NNISS-CDC) foram elevadas. A infecção de sítio cirúrgico (superficial e cavidade) foi a principal complicação infecciosa (87,5%), com precocidade na sua manifestação (média de 27,6 dias). A manifestação clínica mais freqüente foi a febre com 81,3% (13/16). A taxa de mortalidade por infecção em DVP foi de 10% (5/50). No entanto, não houve significância estatística com relação à etiologia da hidrocefalia (p = 0,858), ao tipo de procedimento (derivação primária e reinserção) (p = 0,330), idade do paciente (p = 0,926), tempo de internação pré-operatória (p = 0,172), duração da cirurgia (p = 0,534, RR = 1,09, IC95% [0,6-2,0]), uso de antibioticoprofilaxia (p = 0,567), uso de cateter SNC prévio (p = 0,361) e índice de risco cirúrgico (0, 1, 2) (p = 0,926, RR = 1,07, IC95% [0,76-1,49]). Este estudo serviu para caracterizar a infecção após implantação de sistema de DVP no HGJAF, apontar problemas a serem discutidos através de uma política de prevenção e intervenção precoces.
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Jalan, Rajiv. "Transjugular intrahepatic portosystemic stent-shunt." Thesis, University of Edinburgh, 2000. http://hdl.handle.net/1842/22346.
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The purpose of this thesis was to evaluate (i) the effect of TIPSS on the natural history of cirrhosis (ii) the changes in shunt function following its insertion and study the potential pathogenic mechanisms (iii) the place of TIPSS in the management of variceal haemorrhage in patients with cirrhosis and (iv) the use of TIPSS as a 'model' to study the pathogenesis of sodium retention in patients with cirrhosis. The thesis aims to answer these questions by studying defined cohorts of patients with cirrhosis and portal hypertension undergoing TIPSS insertion for a variety of indications. The thesis is divided into various sections which deal with the above questions. The first section deals with the outcome of patients with cirrhosis treated with TIPSS and assesses the factors predicting mortality, rebleeding, encephalopathy and shunt insufficiency. It also prospectively assesses changes in liver function, neuropsychological profile, haematological profile and appraises their relationship with changes in the portal pressure. Studies in the next section were designed to evaluate the methods for assessment of shunt function and to study the pathogenesis of shunt insufficiency. The place of TIPSS in the management of variceal haemorrhage in patients with cirrhosis is evaluated in a randomised and controlled study in comparison with variceal band ligation. The last section looks at the mechanisms of sodium retention in cirrhosis particularly with reference to the 'hepatorenal reflex'. The final chapter is dedicated to discussing the findings of this study in the light of the available literature and define the areas of deficiency in our understanding and to outline future perspectives. In conclusion, TIPSS is an exciting innovation which is relatively safe and can be performed in the vast majority of patients with cirrhosis with a very low procedure related mortality. Although its place in the management of uncontrolled variceal haemorrhage appears certain, further controlled studies are needed to assess its role in the secondary prophylaxis of variceal haemorrhage and in refractory ascites.
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Lopes, Ricardo Manuel Vinagre. "Clínica médica e cirúrgica em animais de companhia: tomografia computorizada no diagnóstico de anomalias vasculares." Master's thesis, Universidade de Évora, 2015. http://hdl.handle.net/10174/14534.
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Este relatório representa a conclusão de seis meses de estágio curricular incorporado no
Mestrado-Integrado em Medicina Veterinária e pretende descrever as atividades médicas
realizadas e assistidas, assim como a apresentação de uma monografia intitulada “Tomografia
Computorizada no Diagnóstico de Anomalias Vasculares”, a qual representa uma revisão
bibliográfica médica atual do estado de arte do tema.
A tomografia computorizada (TC) destaca-se das restantes modalidades de imagiologia
médica, pelo extraordinário potencial diagnóstico de um vasto leque de condições clínicas, nas
quais se destaca a doença vascular, permitindo a sua caracterização e correta abordagem
médica e cirúrgica.
Permite aquisição de imagens de excelente resolução espacial com muito boa resolução
de densidades, o que permite uma excelente discriminação anatómica, permitindo a visualização
de alterações com tradução macroscópica, que se manifestem por modificação da forma,
dimensão, contorno, densidade ou padrão de captação de contraste, possibilitando a
visualização de eventuais modificações na homogeneidade de órgãos parenquimatosos; Abstract:
Computed Tomography in the Diagnosis of Vascular Anomalies
This report presents the completion of six months of traineeship incorporated into the
Integrated Masters in Veterinary Medicine and is intended to describe the medical activities
performed and assisted, as well as the presentation of a monograph entitled "Computed
Tomography in Diagnosis of Vascular Anomalies", which is an actual medical literature review of
the subject state of the art.
Computed tomography (CT) stands out from the other variants of the medical radiology
by its extraordinary diagnostic potential of a wide range of clinical conditions, in which vascular
disease stands out, allowing its characterization and therefore its correct medical and surgical
approach.
It allows the acquisition of excellent resolution spacial images with a very good resolution
of densities, which allows an excellent anatomic discrimination, enabling to visualize the
alterations with a macroscopic translation, that manifest by the modification of shape, dimension,
outline, density or contrast captation pattern, being possible to visualize the eventual
modifications in the homogeneity of the parenchymatous organs.
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Maurya, Devalāla. "Hindī sāhitya kā itihāsa-darśana aura Rāmacandra Śukla /." Ilāhābāda : Eksīlensa pabliśarsa, 1993. http://catalogue.bnf.fr/ark:/12148/cb36190705w.
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Mota, Vítor Gomes. "Achados Ecodopplercardiográficos em Pacientes com Doença Hepática Crônica com Shunt Intrapulmonar quando comparados aos sem Shunt." Universidade Federal de Pernambuco, 2013. https://repositorio.ufpe.br/handle/123456789/10339.
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A doença hepática crônica (DHC) apresenta elevada incidência e prevalência em todo o mundo. Entre as suas principais causas, destacam-se a ingestão crônica e excessiva de álcool, as hepatites virais e a esquistossomose. O ecoDopplercardiograma trasnstorácico contrastado (ETC) é o exame padrão ouro na pesquisa de shunt intrapulmonar (SIP), no diagnóstico da cardiomiopatia cirrótica (CMC) e no rastreio da hipertensão portopulmonar nos pacientes com DHC. Essa pesquisa objetiva verificar as alterações ecoDopplercardiográficas em hepatopatas crônicos com SIP quando comparados ao pacientes sem SIP, tendose a hipótese de que a ocorrência de alterações ecocardiográficas é mais elevada em pacientes com doença hepática e SIP quando comparada aos sem SIP. Consiste de uma revisão sistemática intitulada: ´´O EcoDopplercardiograma na Doença Hepática Crônica``, onde se faz uma análise sobre os artigos publicados avaliando a ocorrência de alterações ecocardiográficas em pacientes com DHC, enfatizando-se o cálculo do volume atrial esquerdo, a identificação da disfunção diastólica no diagnóstico da CMC, protocolos utilizados na pesquisa de SIP e rastreio da hipertensão portopulmonar. Cento e sessenta e oito pacientes foram elegíveis para o estudo, oriundos do ambulatório de hepatologia do Hospital das Clínicas da Universidade Federal de Pernambuco, no período de 2010 a 2012, em Recife, PE. No artigo com título ´´Achados ecoDopplercardiográficos em pacientes com doença hepática crônica com shunt intrapulmonar quando comparados aos sem shunt``, descreveu-se o estudo em detalhes. Em seus resultados observou-se maior ocorrência de disfunção diastólica moderada nos pacientes com SIP (24 vs. 16, P = 0,034). Os pacientes com grau II de SIP apresentaram frequência mais elevada de disfunção diastólica moderada do que os de grau I (16 vs 8, P = 0,028). Não houve diferença estatística em relação ao volume atrial esquerdo entre os grupos (58 vs 55, P = 0,181), bem como na ocorrência de hipertensão arterial pulmonar (25 vs 33, P = 0,963). A presença de SIP, assim como o grau II de SIP apresentaram boa correlação com disfunção diastólica moderada pelo ETC. A disfunção diastólica moderada pareceu ter efeito preditor para aparecimento de SIP.
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Van, Greunen Corneluis Erasmus. "Neutral-point-clamped shunt active filter." Thesis, Link to the online version, 2005. http://hdl.handle.net/10019/1265.
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Rodgers, Jackie Michele. "The immunology of hydrocephalus shunt infections." Thesis, University College London (University of London), 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.246215.
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Ellero, Bernard. "Shunt veino-veineux en transplantation hepatique." Université Louis Pasteur (Strasbourg) (1971-2008), 1986. http://www.theses.fr/1986STR1M206.
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Heine, Christopher Raphael Tazio. "CT-basierte Untersuchungen zur Korrelation von pulmonaler Belüftungsstörung und Gasaustausch im Tierexperiment." Doctoral thesis, Universitätsbibliothek Leipzig, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-156277.
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Maschinelle Beatmung kann eine vorbestehende Lungenerkrankung weiter aggravieren und das Lungenparenchym zuvor lungengesunder Patienten schädigen. Pulmonale Atelektasen können diese Schädigung noch verstärken. Aus diesem Grund ist es erstrebenswert das Auftreten von Atelektasen frühzeitig zu erkennen und zu quantifizieren, um Gegenmaßnahmen wie Rekrutierung oder PEEP-Applikation zu ergreifen. Den aktuellen Goldstandard zur Detektion und Quantifizierung von Belüftungsstörungen stellt die quantitative Analyse mittels Computertomographie (qCT) dar, welche jedoch nur mit hohem Aufwand und potenziellen Risiken für den Patienten durchführbar ist. Wir untersuchten daher anhand von 14 Schafen mit gesunden Lungen die Beziehung zwischen Atelektasen und intrapulmonaler Shuntfraktion sowie dem arteriellen Sauerstoffpartialdruck (PaO2) mit dem Hintergrund, eine möglichst bettseitig durchführbare Alternative zur qCT zum Zwecke der Quantifizierung der pulmonalen Atelektasen zu erhalten. Die Quantifizierung der Atelektasen könnte es ermöglichen, die Notwendigkeit einer Beatmungsoptimierung festzustellen und deren Erfolg zu beurteilen. Hierzu wurden die o.g. Schafe standardisiert mit einer inspiratorischen Sauerstofffraktion von 1 maschinell beatmet und das nichtbelüftete Lungengewebe mittels qCT quantifiziert. Parallel wurden der arterielle und gemischt-venöse Sauerstoffpartialdruck gemessen sowie die Shuntfraktion berechnet. Mittels Regressionsanalyse konnte eine starke Korrelation zwischen nichtbelüftetem Lungengewebe und natürlichem Logarithmus des PaO2 (R2=0,8) einerseits und der Shuntfraktion (R2=0,83) andererseits aufgezeigt werden. Aufgrund der Ergebnisse scheint es möglich über eine einfache Messung des PaO2 oder Berechnung des Shunts Rückschlüsse auf das Ausmaß der Atelektasen zu ziehen und so durch geeignete Gegenmaßnahmen die beatmungsassoziierte Schädigung von Lungenparenchym zu reduzieren.
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Mokrani, Bilal. "Piezoelectric shunt damping of rotationally periodic structures." Doctoral thesis, Universite Libre de Bruxelles, 2015. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/209112.
Full textAbstract:
New materials and new fabrication techniques in turbomachinery lead to monolithicstructures with extremely low damping which may be responsible for severe vibrations
and possible high-cycle fatigue problems. To solve this, various techniques
of damping enhancement are under investigation. The present work is focused on
piezoelectric shunt damping.
This thesis considers the RL shunt damping of rotationally periodic structures using
an array of piezoelectric patches, with an application to a bladed drum representative
of those used in turbomachinery. Due to the periodicity and the cyclic symmetry of
the structure, the blade modes occur by families with very close resonance frequencies,
and harmonic shape in the circumferential direction; the proposed RL shunt
approaches take advantage of these two features.
When a family of modes is targeted for damping, the piezoelectric patches are
shunted independently on identical RL circuits, and tuned roughly on the average
value of the resonance frequencies of the targeted modes. This independent
configuration offers a damping solution effective on the whole family of modes, but
it requires the use of synthetic inductors, which is a serious drawback for rotating
machines.
When a specific mode with n nodal diameters has been identified as critical and
is targeted for damping, one can take advantage of its harmonic shape to organize
the piezoelectric patches in two parallel loops. This parallel approach reduces considerably
the demand on the inductors of the tuned inductive shunt, as compared
to independent loops, and offers a practical solution for a fully passive integration
of the inductive shunt in a rotating structure.
Various methods are investigated numerically and experimentally on a cantilever
beam, a bladed rail, a circular plate, and a bladed drum. The influence of blade
mistuning is also investigated.
Doctorat en Sciences de l'ingénieur
info:eu-repo/semantics/nonPublished
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Yiauw, K. H. "An investigation of shunt active power filters." Thesis, Swansea University, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.636711.
Full textAbstract:
Electrical power quality has grown from obscurity to a major issue due to the wide use of non-linear power electronic loads in many applications. Passive filters have been extensively used to prevent harmonics from entering the power system. However, there are many disadvantages and hence active power filters provide an alternative solution to the passive filters. Active power filters have the advantages over the passive filters such as low cost, smaller physical size and are able to compensate for randomly varying harmonic currents. In this thesis, Shunt active power filters have been employed for harmonic current and reactive power compensation for typical non-linear loads. The characteristics of active power filters have been discussed and the operation modes of both single-phase and three-phase active power filters have been documented. The proposed APF system is based on voltage-source current-controlled PWM converter topology, and uses two separate controllers, namely current control loop (CCL) and voltage control loop (VCL). CCL deals with the supply current using a PI controller for current harmonic reduction by injecting the required amount of harmonic current components with equal in magnitude but opposite in polarity to the utility to cancel the harmonic currents produced by the non-linear power electronics load. The VCL is based on sliding mode (SLMC) control, it served two purposes: it regulates and maintains the DC capacitor voltage at a constant level and provides the feedback information for the reference current. The design of the proposed active power filter system has been carried out using ORCAD PSPICE simulation software package. The contribution of this research work is in-depth investigation of the shunt active power filter for supply current harmonics reduction and reactive power compensation, the current waveform is maintained sinusoidal and in phase with the supply voltage for a given non-linear load so as to improve the power factor. The current information is extracted using the supply current detection method and the voltage source current controlled PWM converter is employed to extract the voltage information required for the APF action. The simulation and practical results are discussed and conclusion drawn.
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Gripp, Jorge Augusto de Bonfim. "Piezoelectric shunt damping using adaptive resonant circuits." Instituto Tecnológico de Aeronáutica, 2015. http://www.bd.bibl.ita.br/tde_busca/arquivo.php?codArquivo=3307.
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Piezoelectric shunt damping is a well-known technique to damp mechanical vibrations of a structure. This technique consists in using a piezoelectric transducer to convert mechanical vibration energy into electrical energy, which is partially dissipated in an electrical circuit. Among the circuits proposed over the last decades for the efficient conversion of mechanical vibration energy into electric energy, the resonant circuit was the first one that achieved satisfactory results. Resonant shunts consist of a resistor (R) and a inductor (L) connected in series with a piezoelectric transducer, which already contains an intrinsic capacitance. The resonance frequency of this circuit is tuned to the vibration natural frequency of the mechanical structure, which results on the maximum energy conversion and maximum vibration damping. Unfortunately, this technique presents limitations in real aplications, because small variations in the structure, circuit components, and operational conditions can decouple the electrical and mechanical natural frequencies and radically reduce the performance. In order to damp mechanical vibrations in lightweight structures subject to variabilities, a new piezoelectric shunt damping technique with improved performance and robustness is presented in this work. This thesis describes an adaptive resonant piezoelectric vibration absorber enhanced by a synthetic negative capacitance. The resonant shunt circuit autonomously adapts its inductance value (L) by comparing the phase difference of the vibration velocity and the current flowing through the shunt circuit. Moreover, a synthetic negative capacitance is added to the shunt circuit to enhance the electromechanical coupling in the energy conversion and, as a consequence, improve the vibration damping. Validation of the proposed method is done by bonding the piezoelectric absorber on a metallic shell to attenuate vibrations. The circuitry is implemented using analog components.
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Fredriksson, Daniel, and Göransson Milou Carlfors. "Evaluation of Shunt Distancein Resistance Spot Welding." Thesis, KTH, Materialvetenskap, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-277903.
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The purpose of this study was to generate a greater understanding of how the shunt distance affects the shunting phenomena which occurs when working with resistance spot welding (RSW). Shunting affects the quality of the weld and the goal of the study was to create guidelines for RSW to minimize its impact on the weld quality. In order to minimize waste from production and to reduce the welding time there is need for understanding of what the shunt effect depends on. To evaluate what impact the shunt distance will have on the weld, two different experiments were performed. In the first experiment, a one-dimensional welding lobe was manufactured for various materials and the current range was compared over three different shunt distances. The second experiment consisted of welding with a constant current on different shunt distances to investigate how this would impact the second weld performed in the welding sequence. A range of different steel grades and sheet thicknesses was used in the experiments to further explore what impact different material properties will have on the shunt effect. The result showed that the shunt distance has little impact on the acceptable weld-current range, with minor deviations. However, the shunt distance will affect the size of the shunted weld, which decreases as the shunt distance is reduced. Overall, the data collected in this study is not expansive enough to make guidelines that could be implemented in today´s industry. The phenomena of shunting require more data to fully be understood.Syftet med denna studie var att skapa en större förståelse för hur shuntavståndet påverkar det shunt-fenomen som uppstår när man arbetar med punktsvetsning (RSW). Shuntning påverkar svetsens kvalitet och målet var att skapa riktlinjer för arbete med RSW för att minimera shunt-effektens påverkan på svetsen. I syfte att kunna minimera spill i produktionen samt att minska svetstiden krävs det förståelse av vad shunt effekten beror på. För att utvärdera vilken påverkan shuntavståndet kommer att ha på svetsen utfördes två olika experiment. I det första experimentet skapades en endimensionell svetslob för varje material och det genererade strömintervallet jämfördes över tre olika shuntavstånd. Det andra experimentet bestod av svetsning med en lika stor ström vid olika shuntavstånd för att undersöka hur detta skulle påverka den andra svetsen. En rad olika stålsorter och plåttjocklekar användes för att ytterligare se vilken påverkan dessa faktorer kom att ha på shunteffekten. Resultatet visade att shuntavståndet hade liten inverkan på det acceptabla svetsströmintervallet, med mindre avvikelser. Emellertid påverkar shuntavståndet storleken på den shuntade svetsen genom att storleken minskar när shuntavståndet minskas. Sammantaget räcker inte de uppgifter som samlats in i denna studie för att skapa riktlinjer som skulle kunna implementeras i dagens industri, utan det krävs mer data för att fullständigt kartlägga shunteffekten.
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Poincloux, Laurent. "Shunt portosystémique par échoendoscopie sur modèle animal." Thesis, Clermont-Ferrand 1, 2016. http://www.theses.fr/2016CLF1MM08.
Full textAbstract:
L’échoendoscopie thérapeutique occupe une place croissante et incontournable de l’activité médico-chirurgicale en pathologie digestive depuis le développement des sondes sectorielles. Les domaines d’application de cette technique interventionnelle mini-invasive sont de plus en plus nombreux, d’une part en pathologie biliopancréatique et entérale permettant la réalisation d’anastomoses évitant un recours à la chirurgie traditionnelle, et d’autre part en cancérologie digestive car elle permet de délivrer un agent thérapeutique, une source de rayonnement ou des cellules liées au système immunitaire dans une lésion ciblée. L’abord vasculaire est une voie récente et prometteuse de l’échoendoscopie interventionnelle offrant des perspectives thérapeutiques en hépatologie notamment dans le domaine de l’hypertension portale. Ce travail se décompose en trois parties décrivant successivement l’état de l'art des applications de l’échoendoscopie interventionnelle, puis deux travaux originaux expérimentaux : dans un premier temps, le transfert de la technique d’anastomose biliodigestive (réalisée régulièrement dans notre centre) à l’abord vasculaire portosystémique sur animal sain, puis dans un deuxième temps la validité de la technique sur modèle animal de fibrose hépatique. La première série d’expérimentations a permis de mettre au point la technique de création d’un shunt intrahépatique portosystémique par échoendoscopie chez 23 cochons sains, en collaboration avec l’équipe de radiologie vasculaire. Ces procédures ont été réalisées dans une salle de cathétérisme vasculaire expérimentale (laboratoire Caviti) dans le cadre du laboratoire d’accueil ISIT (Image Science for Interventional Techniques, Pr. L. Boyer, Pr. J.-Y. Boire, UMR CNRS/UDA 6284). Les résultats ont été concluants puisque le shunt est apparu faisable dans 91% des cas, fonctionnel dans 81% des cas avec une morbidité de 14,2%. La deuxième série d’expérimentations a permis de valider cette technique d’échoendoscopie chez un modèle porcin de fibrose hépatique par embolisation radiologique, en collaboration avec l’Institut National de Recherche Agroalimentaire de Theix pour la stabulation des animaux. Ce travail multidisciplinaire a permis une collaboration étroite entre endoscopistes, radiologues, chirurgiens viscéraux et anatomopathologistes, s’inscrivant dans une démarche de recherche transversale. Les résultats sont encourageants puisqu’un shunt intrahépatique porto-systémique par échoendoscopie s’est révélé techniquement faisable et fonctionnel sur modèle de fibrose hépatique avec une survie à 7 jours des animaux dans deux tiers des cas. Avant d’envisager une étude princeps chez l’homme, des études complémentaires sont néanmoins nécessaires sur des modèles porcins présentant une fibrose hépatique associée à une hypertension portale en augmentant la durée de stabulation, en homogénéisant la procédure de squelettisation de l’artère hépatique et en adaptant la dose de solution injectée. Cette technique pourrait constituer à terme une alternative en cas d’échec de la technique standard pour complications de l’hypertension portale (shunt intrahépatique portosystémique par voie transjugulaire) chez des patients alors en situation d’impasse thérapeutiqueTherapeutic endoscopic ultrasonography is a growing and essential part of the medical and surgical activity in digestive pathology since the development of sectoral probes. The fields of application of this minimally invasive interventional technique are more and more numerous, on the one hand in biliopancreatic and enteral pathology, allowing the realization of anastomoses without traditional surgery, and on the other hand in digestive oncology, because it makes it possible to deliver a therapeutic agent, a source of radiation or cells linked to the immune system in a targeted lesion. The vascular approach is a recent and promising way of interventional endoscopic ultrasound offering therapeutic perspectives in hepatology, especially in the field of portal hypertension.This work is divided into three parts successively describing the state of the art of the applications of interventional ultrasonoscopy, then two original experimental works: initially, the transfer of the technique of biliodigestive anastomosis (performed regularly in our center ) at the portosystemic vascular approach on healthy animal, then in a second time the validity of the animal model technique of liver fibrosis.The first series of experiments led to the development of the technique for the creation of an intrahepatic shunt portosystemic by echoendoscopy in 23 healthy pigs, in collaboration with the vascular radiology team. These procedures were performed in an experimental vascular catheterization room (Caviti laboratory) as part of the ISIT host laboratory (Image Science for Interventional Techniques, Prof. L. Boyer, Pr. J.-Y.Boire, UMR CNRS / UDA 6284). The results were conclusive since the shunt appeared feasible in 91% of cases, functional in 81% of cases with a morbidity of 14.2%. The second series of experiments validated this endoscopic ultrasound technique in a porcine model of liver fibrosis by X-ray embolization, in collaboration with Theix National Institute for Food Research for Animal Stabling. This multidisciplinary work has allowed close collaboration between endoscopists, radiologists, visceral surgeons and anatomopathologists, as part of a transversal research approach. The results are encouraging since a porto-systemic intrahepatic shunt by endoscopic ultrasonography proved to be technically feasible and functional on a hepatic fibrosis model with a 7-day survival of the animals in two-thirds of the cases. Before considering a primary study in humans, additional studies are nevertheless necessary on porcine models presenting hepatic fibrosis associated with portal hypertension by increasing the duration of stabulation, by homogenizing the procedure of skeletonization of the hepatic artery and by adjusting the dose of injected solution. This technique could eventually be an alternative in case of failure of the standard technique for complications of portal hypertension (intrahepatic portosystemic shunt transjugular) in patients then in a situation of therapeutic impasse
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Fan, Shuxia [Verfasser], and Steffen [Akademischer Betreuer] Massberg. "Calcium signaling in platelet migration / Shuxia Fan ; Betreuer: Steffen Massberg." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2018. http://d-nb.info/1230754474/34.
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DUCOIN, HENRI. "Shunts portosystemiques intrahepatiques : etude histopathologique a propos de 22 cas." Toulouse 3, 1994. http://www.theses.fr/1994TOU31552.
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Zhou, Biao. "Etude de l'amortissement piézoélectrique shunté appliqué aux roues aubagées désaccordées." Phd thesis, Ecole Centrale de Lyon, 2012. http://tel.archives-ouvertes.fr/tel-00945457.
Full textAbstract:
Ce travail porte sur l'étude d'amortissement piézoélectrique shunté pour les roues aubagées désaccordées de turbomachines. Les problèmes vibratoires sont de première importance pour les motoristes aéronautiques et, parmi ceux-ci, les vibrations causées par le désaccordage des aubes tiennent une place importante puisqu'elles sont à l'origine des phénomènes de fatigue oligocyclique et des risques de défaillance associés. L'usage de technologies d'amortissement est donc assez répandu pour réduire l'amplitude vibratoire. Ici, on s'intéresse à l'étude de l'amortissement piézoélectrique shunté appliqué aux roues aubagées désaccordées. Dans notre stratégie, des patchs piézoélectriques shuntés sont attachés sur la surface de la roue entre les aubes adjacentes afin de dissiper l'énergie mécanique de la roue. Par conséquent, l'amplitude des aubes peut être réduite du fait du couplage entre les aubes et la roue. Cette stratégie est d'intérêt pour l'ingénieur car les transducteurs piézoélectriques sont placés en dehors du flux principal des turbomachines. Un modèle numérique a été développé intégrant des circuits piézoélectriques shuntés résonnants. L'amortissement piézoélectrique shunté et un motif optimisé de désaccordage piézoélectrique sont tous les deux introduits afin de minimiser l'effet du désaccordage des aubes. En pratique, le désaccordage des aubes change au cours de la vie du moteur. Les raisons peuvent être multiples comme l'usure, des endommagements par impacts qui vont conduire inévitablement à une évolution du motif du désaccordage. En s'appuyant sur la stratégie de contrôle adaptatif, nous avons proposé un shunt piézoélectrique résonant capable de suivre l'évolution de la structure au cours du temps. Les simulations numériques montrent qu'une bonne efficacité est obtenue en termes de réduction des vibrations de roues aubagées désaccordées. Dans cette thèse, une dernière stratégie est proposée qui correspond à la mise en place d'un système de pompage énergétique nonlinéaire basé sur les éléments piézoélectriques. Une fois intégrées dans une structure mécanique, il est donc en mesure d'agir en tant qu'amortisseur de vibrations, adaptatif et large bande. Une méthode numérique, à coefficient variables de balance harmonique, a été développée afin de calculer les réponses quasi-périodiques associés à ce type de problème. Ce dispositif de pompage énergétique piézoélectrique semble particulièrement intéressant dans le cadre des roues aubagées désaccordées, car il est capable d'interagir de façon adaptative avec chaque secteur de la roue désaccordé. Des résultats prometteurs ont été obtenus et illustrent démontrent ce point de vue.
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Shukla, Aditi [Verfasser]. "Analysis of overlapping reading frames in viral genomes / Aditi Shukla." Lübeck : Zentrale Hochschulbibliothek Lübeck, 2016. http://d-nb.info/1103156020/34.
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Cui, Shuna [Verfasser], and Ursula [Akademischer Betreuer] Bilitewski. "The cellular and molecular properties of genistein against C. albicans infection / Shuna Cui ; Betreuer: Ursula Bilitewski." Braunschweig : Technische Universität Braunschweig, 2011. http://d-nb.info/1175826618/34.
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Su, Yingjun, and 蘇穎君. "The emerging regulatory state in China: a study of Shunde's experience." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2003. http://hub.hku.hk/bib/B31227831.
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Thierry, Olivier. "Réduction des vibrations de structures composites complexes par dispositifs piézoélectriques shuntés : application aux aubes de turbomachines." Thesis, Paris, CNAM, 2016. http://www.theses.fr/2016CNAM1111/document.
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Cette thèse CIFRE (Conventions Industrielles de Formation par la REcherche), en collaboration avec Safran Aircraft Engines, concerne la réduction des vibrations de flexion en basse fréquence d'une aube de rotor de soufflante en matériau composite. L'intérêt premier est de réduire les marges au flottement en augmentant l'amortissement des aubages pour permettre l'utilisation des moteurs dans des plages de fonctionnement à haut rendement actuellement inexploitées. Les autres avantages directement liés à la réduction de vibration sont l'augmentation de la durée de vie des pièces ainsi que la réduction du bruit du moteur. L'objet de cette étude, est d'étudier différents dispositifs d'amortissement de vibrations piézoélectriques, en basses fréquences, applicables à une aube de turbomachine fabriquée en matériaux composites. Les applications principalement visées sont des aubes de rotor de soufflante ou des pales de rotor non caréné ("open-rotor"), de géométrie élancée et complexe. Les solutions étudiées utilisent des éléments piézoélectriques couplés à un circuit électrique passif ou semi-passif. Le coeur de ce travail de thèse, encore un verrou scientifique à l'heure actuelle, est de proposer des solutions performantes qui intègrent les éléments piézoélectriques aux aubes de soufflante afin de respecter les contraintes aérodynamiques imposées pour ce type de structure, tout en augmentant l'amortissement sur un des premiers modes de vibration. Les performances de ce genre de dispositifs sont directement liées à une grandeur : le facteur de couplage électromécanique, qu'il s'agit de maximiser. Il dépend de toutes les caractéristiques de la structure : les matériaux utilisés (structure composite hôte, matériau piézoélectrique), mais surtout du placement et de la géométrie des éléments piézoélectriques. L'utilisation de matériaux piézoélectriques connectés à des circuits actifs, semi-passifs ou passifs a été largement étudiée mais les expériences traitent presque toujours de cas académiques de poutres ou de plaques. L'objectif est ici, pour le dispositif piézoélectrique développé, de pouvoir évaluer les performances des shunts en terme d'atténuation sur une structure massive faiblement amortie. Une partie du travail consiste ainsi à bâtir un modèle éléments finis prédictif de la structure composite couplée aux matériaux piézoélectriques, en vue de quantifier les performances du dispositif. Plusieurs solutions sont testées sur une structure simple pour évaluer l'influence sur les performances du dispositif, (1) du choix du matériau piézoélectrique, (2) du placement et de la géométrie des éléments piézoélectriques ainsi que (3) du circuit électrique dissipatif. Différentes solutions d'intégration à l'aube sont proposées et une méthode de caractérisation des propriétés des matériaux tissés est développée dans la perspective d'intégrer les matériaux actifs à la préforme du composite. Cette étude est à la fois numérique et expérimentale : un démonstrateur, utilisant une aube en matériaux composites est conçu puis testé en laboratoire pour valider les concepts proposésThis thesis concerns the vibration reduction in the low frequency range of a composite fan blade of a turbojet engine with piezoelectric devices. The interest is to increase lifespan and avoid flutter phenomena by reducing the vibration amplitude. The purpose of this thesis is to study several shunted piezoelectric devices, in the low frequency range, that can be applied to a woven composite turbojet fan blade. The targeted applications are the LEAP fan blades or the “open-rotor” fan blade, both of them required to manage a complex geometry. The solutions investigated used piezoelectric elements coupled to a passive or semi-passive circuit. The core of this thesis, still a scientific obstacle at present, is to propose efficient solutions that integrate the piezoelectric elements to the fan blades in order to meet aerodynamic constraints for this type of structure, while increasing damping level on one of the first modes of vibration. The performances of such devices are directly related to a coefficient: the electromechanical coupling factor that requires to be maximized. This coefficient depends on all the features of the structure: materials used (host composite structure, piezoelectric material), but especially the placement and geometry of the piezoelectric elements. The use of piezoelectric material connected to active, semi-passive or passive circuits has been extensively studied but the experiences almost always deal with academic cases such as beams or plates. The aim is for the developed piezoelectric device, to evaluate the damping performance of a weakly damped massive structure.A part of the work is thus to develop a predictive finite element model of the structure coupled to the piezoelectric material to quantify the performance of the device. Several solutions are tested on a simple structure to evaluate the influence on the device performance of, (1) the choice of the piezoelectric material, (2) the placement and geometry of the piezoelectric elements, and (3) of the dissipative circuit. Various integration solutions in the blade are proposed and a method for characterizing the properties of woven materials is developed in the perspective of integrating the active materials in the composite preform.This study is both numerical and experimental: a demonstrator using a composite fan blade is designed and tested in the laboratory to validate the proposed concepts
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Uz, Eda. "Design And Implementation Of Thyristor Switched Shunt Capacitors." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12611616/index.pdf.
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This research work deals with the analysis, design and implementation of thyristor switched plain capacitor banks and thyristor switched shunt filter banks. Performances of various thyristor switched capacitor (TSC) topologies are also investigated by simulations. The theoretical findings have been verified by carrying out experimental work on two prototypes implemented within the scope of this research work, one is a wye-connected laboratory prototype and the other is a delta-connected application prototype integrated to some of the SVCs existing in Turkish Coal Enterprise s Plants. The advantages of back-to-back connected thyristor switches over conventional electromechanical contactors are also made clear by conducting an intensive experimental work in the laboratory. A good correlation have been obtained between theoretical and experimental results.
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Sedighy, Mohammad. "A robust VSC-based shunt active power filter." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0002/NQ41307.pdf.
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Haugan, Thomas Sagvold. "Smart Grid: Shunt Compensation in Non-Sinusoidal Regimes." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for elkraftteknikk, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-20732.
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The electric power theory is of fundamental importance in most aspects of electric power engineering, enabling to analyze and control the grid based on an unambiguous physical interpretation of the power and current flow. The futuristic SmartGrid concept will include scenarios of potentially very challenging network conditions, due to large impact of non-linear loads, combined with unsymmetric and non-sinusoidal voltage regimes. New and more advanced power theories are needed, in order to maintain correct physical understanding of the power grid, independently of voltage conditions. Moreover sophisticated power theories can help identify and eliminate detrimental effects induced by loads; i.e. unsymmetry, reactive power consumption and harmonic pollution. This project has reviewed the recent and promising conservative power theory (CPT). Major part of the project was dedicated to experimental research, evaluating the CPT purely from a power theory perspective. Central part of these experiments was a real-time rapid prototyping system (RPS) and three-phase voltage source converter. Control system for the programmable voltage source, data acquisition and CPT-algorithm were implemented by the RPS. Based on extensive tests it was found that the CPT offers enhanced and physical correct interpretation of current and power flow. Obtained results from the virtual instrumentation are principally consistent with and support previous research presented in the literature. Second part evaluated the CPT in context of shunt active power filter (SAPF). Experimental implementation of SAPF failed, mainly as the RPS did not provide sufficient sampling rate. Selected cases of reactive and harmonic compensation were demonstrated, utilizing computer modeling tools (MATLAB/Simulink). The results conclude that the CPT performs excellent selective compensation, only when grid voltages are balanced sinusoidal. In scenarios of unsymmetric or distorted voltages, the compensation strategies provided by the CPT are apparently less versatile and effective, compared to the popular pq-theory. Overall this study demonstrated that optimal network operation can only be achieved, through the joint action of series and parallel compensators. Future work will amongst others include further in-depth study of the rapid prototyping system, and experimental implementation of SAPF.
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El-Habrouk, Mohamed. "A new configuration for shunt active power filters." Thesis, Brunel University, 1998. http://bura.brunel.ac.uk/handle/2438/5241.
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This thesis presents a new power circuit configuration to be used in shunt active power filters. A new control algorithm based on the linear voltage control suitable for the proposed circuit is introduced. The system is analysed both in time and frequency domains. The practical implementation of the system proves its suitability for the proposed task. The switching frequency of the proposed circuit is much lower than that in other active filters. The switching losses are then considerably reduced, in addition to the fact that the switching devices can withstand larger values of currents being switched on and off at lower frequencies which is an advantage to this circuit. The component sizes (capacitors and inductors) in the proposed circuit are also much smaller than those in other filter configurations. In addition, the thesis presents a new method for categorising the active filter systems proposed in the surveyed literature. The survey includes a comparison of these techniques showing their respective merits and drawbacks. The thesis also includes an implementation of a reference current generator that is suitable for single-phase applications without the need for excessive computations. The technique involves a modified Fourier analysis, which is suitable for active filtering applications.
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Stabile, Alessandro. "Electromagnetic shunt damper for spacecraft micro-vibration mitigation." Thesis, University of Surrey, 2018. http://epubs.surrey.ac.uk/845703/.
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The stringent stability requirements imposed by advanced, high-resolution payloads have produced an increased interest in the development of better-performing micro-vibration isolators. Several devices aimed at mitigating micro-vibrations have been studied and implemented, but their application is still far from being ideal due to the several drawbacks that they present, such as limited low-frequency attenuation for passive systems or high power consumption and reliability issues for active systems. This research focuses on the modelling and testing of Electromagnetic Shunt Dampers (EMSD) characterised by the use of negative impedance converter circuits. An electromagnetic damper is a self-excited device that exploits the interaction between a moving magnetic field and a conductive material to provide a reaction force to the applied motion. An EMSD presents several advantages, but the high ratio of system mass over damping force produced has limited its application in space missions. The use of a negative resistance can considerably lower this ratio since it produces an overall reduction of the circuit resistance that results in an increase of the induced current in the closed circuit and thus the damping performance. In this thesis, the development of a multiphysics, multi-parametric model of an EMSD is presented and accurately corroborated by an extensive test campaign. This damper can be classified as a semi-active damper since the negative resistance circuit does not require any control algorithm to operate. In terms of damping performance, this research demonstrates that an EMSD applied to a 1-DoF system is capable of behaving, throughout the whole temperature range of interest, like a 2nd-order mechanical filter in which the resonance peak is eliminated and the roll-off slope is -40 dB/dec. Additionally, the proposed EMSD is characterised by low required power, simplified electronics and small device mass that could allow it to be comfortably integrated on a satellite. This study presents also a possible novel 2-collinear-DoF system design with embedded EMSDs. This isolator is capable of achieving a remarkable final decay rate of -80 dB/dec while completely eliminating the two resonance peaks due to the high attenuation performance of the dampers. Moreover, other aspects of the proposed 2-collinear-DoF system are investigated in order to assess not only the damping performance but also its features at system level. This work demonstrates that the fundamental advantages of this system can make it a viable, competitive alternative to other actively controlled struts.
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Welgemoed, Frans Marx. "Shunt reactive compensation of voltage dips and unbalance." Thesis, Stellenbosch : University of Stellenbosch, 2010. http://hdl.handle.net/10019.1/5315.
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Thesis (MScEng (Electrical and Electronic Engineering))--University of Stellenbosch, 2010.ENGLISH ABSTRACT: The use of power electronic converters provides a more efficient, accurate and dynamic solution to reactive compensation. In this thesis the application of power electronic converters to shunt reactive compensation will be discussed. In particular voltage dips and voltage unbalance are considered as both can be mitigated by means of shunt reactive compensation. A pre-existing uninterruptible power supply is adapted to operate as a shunt reactive compensator. The uninterruptible power supply consists of a 250 kVA three phase voltage source inverter. The modifications are limited to software and control algorithms that do not alter the normal operation of the uninterruptible power supply. Control algorithms are designed and discussed in detail. A typical double loop control strategy is implemented on the power electronic converter. The inner loop consists of a dead-beat current controller. The outer loop consists of three proportional and integral controllers controlling the DC-bus voltage, AC voltage and voltage unbalance respectively. Voltage dips and unbalance are compensated for using only reactive power. Focus is placed on producing a result can be used easily in practice.
AFRIKAANSE OPSOMMING: Drywings elektroniese omsetters wat gebruik word vir newe reaktiewe kompensasie lewer meer effektiewe, akkurate en dinamiese resultate. In hierdie tesis word die toepassing van drywings elektroniese omsetters vir newe reaktiewe kompensasie bespreek. Daar word meer spesifiek na spannings duike en spannings wanbalans gekyk aangesien albei met newe reaktiewe kompensasie verminder kan word. ’n Bestaande nood kragbron is aangepas om as n newe reaktiewe kompenseerder te funksioneer. Die nood kragbron bestaan hoofsaaklik uit ’n 250 kVA drie fase omsetter spanningsbron. Die aanpassings is beperk tot sagteware en beheer algoritmes wat nie die oorspronklike funksionaliteit van die nood krag bron beinvloed nie. Beheer algoritmes word ontwerp en deeglik bespreek. ’n Tipiese dubbel lus beheer strategie word op die drywings elektroniese omsetter toegepas. Die binnelus bestaan uit ’n voorspellende stroom beheerder. Die buite-lus bestaan uit drie proportioneel en integraal beheerders wat onderskeidelik die GS-bus spanning, WS spanning en spanning wanbalans reguleer. Spannings duike en wanbalans is verminder deur slegs reaktiewe drywing te gebruik. Die doel was ook om ’n prakties bruikbare resultaat te lewer.
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Patil, Ashok R. "High power shunt regulation of spacecraft solar arrays." Diss., Virginia Tech, 1995. http://hdl.handle.net/10919/40216.
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Van, der Toorn Sean. "The protection of high-voltage shunt capacitor banks." Master's thesis, University of Cape Town, 1999. http://hdl.handle.net/11427/19565.
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Bibliography: pages 86-88.The use of shunt capacitor bank equipment is essential if a utility wishes to control the flow of reactive power effectively. The most significant results stemming from this will be lower losses on the system and an increased power transfer capability. Thus it is important that the methods used to protect a shunt capacitor bank will ensure that the bank is available when required. While the more common shunt capacitor problems are related to capacitor unit failures, conditions such as bank over currents, surge voltages and harmonics can cause extended undesired conditions. Today's protection methods are able to remove a shunt capacitor bank from service before extensive damage is done, although the location of the faulty capacitor units will not be known (if this was in fact the reason for the protection tripping the bank). This thesis explores the subject of improving the protection of high-voltage shunt capacitor banks, specifically with respect to the detection of unhealthy fuseless capacitor units. An extensive literature search was carried out on the theory pertaining to the protection of shunt capacitor banks, and a model of a fuse less shunt capacitor bank was built in the laboratory to better understand the failing process of an element within a capacitor unit. The changes in the capacitor unit's current and voltage profiles, as well as those of the remaining healthy capacitor units, were monitored as an element failure was simulated (whereby the element forms a solid weld, or short circuit).Stemming from these experiments, it was found that where a bank consists of strings of units with no interconnection between the units of different strings, an element failure in a capacitor unit would cause a significant decrease in voltage across the affected unit. This voltage change could be used to identify when elements are failing in capacitor units, and the location of the unhealthy unit could also be determined. One potential method would be to have capacitor units with built-in voltage transformers attached across each element section in the unit. As element failures occur either send this information to ground level, where it can be read by a microprocessor relay device, or have a display on the outside of the capacitor unit. In the case of the change in unit current, it was found to be very small and thus had no function for detecting unhealthy capacitor units.
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Smith, Joanna. "Parents' management of their child's hydrocephalus and shunt." Thesis, University of Leeds, 2010. http://etheses.whiterose.ac.uk/1911/.
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Introduction Shunts are the main treatment for hydrocephalus. When shunts malfunction the consequences are serious and can be life threatening. Identifying shunt malfunction requires effective parent-professional collaboration: parents need to recognise and respond appropriately to the symptoms of shunt malfunction in their child; professionals need to integrate parents' information about their child's symptoms during clinical decision-making and diagnosis. This thesis explored parents' experiences of living with a child with hydrocephalus and parents' and professionals' contribution to the diagnosis of shunt malfunction in acute hospital admissions. Methods Two exploratory studies were undertaken using interview and observational methods to elicit data. The framework approach and conversation analysis were used to analyse and interpret data. Findings Parents gain considerable skills and knowledge about their child's health needs. They are able to distinguish between symptoms indicating shunt problems from other childhood illnesses. Deciding where or when to seek help is influenced by minimising disruption for the whole family and prior experiences of healthcare services. Parents' perceive that their expertise is not always valued by health professionals and not always used to make clinical decisions. Analysis of parent-professional interactions suggests health professionals' involvement of parents' in decisions about their child's care is variable. There was evidence of some collaborative practice but tensions were evident within the interactions when parents disagreed with professionals' judgments. Conclusion A collaborative paradigm is appropriate when engaging with expert parents living with a child with hydrocephalus. The challenge for health professionals is to integrate parents' expertise of their child's presenting symptoms within their clinical assessment when planning the child's care.
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Aslan, Seda. "A Computational Fluid Dynamics Study on Bidirectional Glenn Shunt Flow with an Additional Pulsatile Flow Through a modified Blalock-Taussig Shunt." ScholarWorks@UNO, 2017. http://scholarworks.uno.edu/td/2294.
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The blood flow through the Bidirectional Glenn shunt (BGS) and modified Blalock-Taussig shunt (mBTS) to the pulmonary arteries (PAs) was analyzed using Computational Fluid Dynamics. This study consisted of the steady and pulsatile cases. In case one, the results of blood flow through the BGS for the Newtonian and non-Newtonian viscosity models were compared. Case two focused on having an additional pulsatile blood flow through the mBTS using the non-Newtonian Carreau viscosity model. The geometries were created based on the angiograms. In case one, boundary conditions to be specified at the inlets were obtained from the flow rate measurements via Doppler flow studies in children and young adults. The averaged velocities were obtained from these flow rates and specified as parabolic velocity profiles at the inlets. The average PA pressures were obtained from the catheterization data and specified at the branches of the PA outlets. In case two, boundary conditions at the same inlets were constant during the cardiac cycle. The pulsatile PA and aortic pressure tracings obtained from the catheterization data were specified at the outlets and mBTS inlet, respectively. A comparison is made between the first and second case results.
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Tatge, Lena [Verfasser], and Thomas [Akademischer Betreuer] Mir. "Retrospektiver Vergleich zweier palliativer Operationsverfahren bei Kindern mit verminderter Lungendurchblutung : Modifizierter Blalock-Taussig Shunt versus Central Shunt / Lena Tatge. Betreuer: Thomas Mir." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2013. http://d-nb.info/1033403334/34.
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Hau, Hans Michael, Peter Fellmer, Markus B. Schoenberg, Moritz Schmelzle, Mehmet Haluk Morgul, Felix Krenzien, Georg Wiltberger, Albrecht Hoffmeister, and Sven Jonas. "The collateral caval shunt as an alternative to classical shunt procedures in patients with recurrent duodenal varices and extrahepatic portal vein thrombosis." Universitätsbibliothek Leipzig, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-151556.
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Upper gastrointestinal bleeding episodes from variceal structures are severe complications in patients with portal hypertension. Endoscopic sclerotherapy and variceal ligation are the treatment options preferred for upper variceal bleeding owing to extrahepatic portal hypertension due to portal vein thrombosis (PVT). Recurrent duodenal variceal bleeding in non-cirrhotic patients with diffuse porto-splenic vein thrombosis and subsequent portal. cavernous transformation represent a clinical challenge if classic shunt surgery is not possible or suitable.
In this study, we represent a case of recurrent bleeding of duodenal varices in a non-cirrhotic patient with cavernous transformation of the portal vein that was successfully treated with a collateral caval shunt operation.
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Arnell, Kai. "Cerebrospinal Fluid Shunts in Children : Technical Considerations and Treatment of Certain Complications." Doctoral thesis, Uppsala University, Department of Surgical Sciences, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-8295.
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Ventriculo-peritoneal shunting is the most commonly used method for the treatment of paediatric hydrocephalus. Despite improved shunts and surgical techniques there are still complications. This retrospective study focuses on diagnoses and treatment of shunt malfunction and infections. Cost/benefit of using an adjustable shunt was assessed. Two adjustable cerebrospinal fluid shunts and their compatible antisiphon devices were compared in-vitro.
In 21 of 46 children the standard shunt was changed to an adjustable one due to over-drainage. Adjustment of the shunt was performed in 73% of the children thereby avoiding surgery in several cases. This was a financial advantage.
Ascites or an abdominal pseudocyst without infection was detected in eight children due to resorption difficulties. A ventriculo-atrial shunt was inserted for a period of time. In three children it could successfully be reverted to a ventriculo-peritoneal.
In six children papilloedema was the only sign of shunt dysfunction. At revision the intracranial pressure ranged from 25 to 52 cm H2O. Fundoscopic examination in children older than 8 years may detect symptomless shunt malfunction.
During a 13-year period 39 shunt infections were diagnosed. Skin bacteria were found in 80%. Prolonged and anaerobic cultures increased the detection rate by more than one third. The intraventricular infections were treated with intraventricular and systemic antibiotics resulting in quick sterilisation. No relapses were encountered. In five older children with distal catheter infection Propionibacterium acne was found. These were treated with intravenous antibiotics and exchanging of the shunt system.
Strata NSCTM and Codman HakimTM worked according to the manufacturers except at the lowest setting. The resistance was below and in the lower range of the physiological one respectively. The antisiphon device of Strata shunt had to be placed in line with shunt to function properly.
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Sénéchal, Aurélien. "Réduction de vibrations de structure complexe par shunts piézoélectriques : application aux turbomachines." Phd thesis, Conservatoire national des arts et metiers - CNAM, 2011. http://tel.archives-ouvertes.fr/tel-00862517.
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L'objet de cette thèse est d'étudier différents dispositifs d'amortissement de vibrations en basses fréquences des aubes de rotor de soufflante ("fan") d'un turboréacteur. Les solutions étudiées utilisent des pastilles piézoélectriques, liées à l'aube et connectées à un circuit électrique passif ou semi-passif. Dans la première partie, il s'agit de mettre en pratique le modèle électromécanique développé dans la thèse de Julien Ducarne, puis de l'étendre au cas tridimensionnel par l'utilisation de la méthode des éléments finis. Ce modèle de comportement prend en compte le couplage entre une structure mécanique quelconque et des pastilles piézoélectriques planes ou courbes. Par la suite, un modèle réduit à faible nombre de degrés de liberté est construit, ce qui permet après résolution de prédire l'efficacité des dispositifs amortissants. Deux techniques, nommées "shunt" et "switch" sont appliquées au cas d'une aube fan. La première consiste à utiliser un circuit électrique résistif ou résonant. La seconde, encore à l'état de recherche, comporte un circuit muni d'un interrupteur synchronisé aux oscillations de la structure, ce qui produit un amortissement analogue à celui d'un frottement sec. La modélisation et l'optimisation électrique de ces circuits, issus de différents travaux antérieurs, ne font l'objet que d'un rappel dans ce mémoire. Une procédure d'optimisation est développée pour pouvoir trouver les géométries et les emplacements des pastilles qui maximisent le couplage électromécanique. Deux algorithmes différents (recuit simulé et recherche avec liste taboue) sont utilisés et mis en interaction avec les outils de calcul éléments finis pour trouver des solutions optimisées. Afin de valider sur un cas industriel l'ensemble des travaux sur les dispositifs piézoélectriques, une campagne d'essai est menée sur une aube fan de CFM56-7b. Les niveaux d'atténuation mesurés et ceux prévus par le modèle sont ensuite comparés. La seconde partie est consacrée à l'évaluation de l'effet des nonlinéarités géométriques sur la dynamique d'une structure tournante. Initialement prévue pour être intégrée à la partie shunt piézoélectrique, ceci afin de pouvoir estimer l'efficacité de ce dernier lorsque la structure tourne et vibre en grande amplitude, l'étude n'a pas été poursuivie et constitue une partie sans lien avec les techniques de réduction de vibrations. Néanmoins, les résultats obtenus en 1D, ainsi que la méthode de prise en compte des nonlinéarités dans le cas 3D viennent compléter et enrichir les différentes études actuelles menées sur le sujet, raison pour laquelle ce chapitre a été ajouté à ce mémoire. La détermination des caractéristiques dynamiques modales et leurs évolutions en fonction de certains paramètres de fonctionnement de l'aube constituent l'objet de cette partie. Plusieurs modèles sont développés et comparés pour pouvoir juger de la présence et de l'importance des divers phénomènes non linéaires dans la réponse forcée d'une poutre en rotation.
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Braun, Marlon Alexander [Verfasser], and P. [Akademischer Betreuer] Shukla. "Scalarized Preferences in Multi-objective Optimization / Marlon Alexander Braun ; Betreuer: P. Shukla." Karlsruhe : KIT-Bibliothek, 2018. http://d-nb.info/1159637571/34.
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Li, Xiangnong. "The role of intrahepatic shunts in the normal and cirrhotic rat liver." Thesis, King's College London (University of London), 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.271055.
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Hong, Jeesoon. "Gendered modernism of Republican China : Lu Yin, Ling Shuhua and Zhang Ailing." Thesis, University of Cambridge, 2004. https://www.repository.cam.ac.uk/handle/1810/284028.
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Basseau, Fabrice. "Etude des débits dans les shunts d'hémodialyse par " color velocity imaging quantification "." Bordeaux 2, 1999. http://www.theses.fr/1999BOR23025.
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