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Kollari, Enes. "Pulmonary vein isolation (PVI) in patients with atrial fibrillation." Thesis, Örebro universitet, Institutionen för medicinska vetenskaper, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-66697.
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Schubert, Martin Verfasser], Marcus A. [Akademischer Betreuer] [Glomb, and Thomas [Akademischer Betreuer] Simat. "Untersuchungen zum Einsatz von PVI, PVP bei Bier und Wein / Martin Schubert. Betreuer: Marcus Glomb ; Thomas Simat." Halle, Saale : Universitäts- und Landesbibliothek Sachsen-Anhalt, 2011. http://d-nb.info/1025231163/34.
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Beckené, Stéphanie [Verfasser]. "Evaluation der Aussagekraft des Plethysmographie-Variabilitätsindex (PVI) während operativer Eingriffe bei Früh- und Neugeborenen / Stéphanie Beckené." Bonn : Universitäts- und Landesbibliothek Bonn, 2015. http://d-nb.info/1080592083/34.
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Souza, João Augusto Leonel de [UNESP]. "Pressão subaracnóide, índice pressão volume e parâmetros cardiorrespiratórios em ovinos submetidos a mielografia lombar." Universidade Estadual Paulista (UNESP), 2016. http://hdl.handle.net/11449/143861.
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
A mielografia é muito realizada na prática veterinária, entretanto, existem importantes efeitos adversos associados a ela. O objetivo da presente pesquisa foi avaliar os possíveis efeitos sobre a pressão subaracnoide, parâmetros cardiorrespiratórios (TC, FR, FC, PAS, PAD, PAM, EtCO2, SpO2, InspISO e FeISO) e do índice de pressão-volume (PVI) em ovelhas hígidas submetidas à mielografia lombar. Foram utilizados 8 ovinos fêmeas sadios, os quais foram pré-medicados com Midazolan (0,5 mg/Kg), indução anestésica com Propofol (3-6 mg/Kg) e manutenção anestésica com Isoflurano. Primeiramente, os animais foram submetidos à punção da cisterna magna para monitoramento da pressão subaracnoide (Sap). Ato contínuo, foi realizado a mielografia lombar por meio da aplicação de Iohexol (300 mg/mL, taxa de 4,1 mL/min e dose de 0,4 mL/Kg). Os momentos estudados foram: imediatamente após a estabilização anestésica (M0), durante a punção lombar (M1), dois, quatro e seis minutos após a aplicação do contraste (M2, M3 e M4, respectivamente). A Sap foi colhida imediatamente após à punção atlanto-occipital (Sap0), o maior valor durante a aplicação do meio de contraste (Sapmax), dois, quatro e seis minutos após a aplicação do meio de contraste (Sap2, Sap3 e Sap4, respectivamente). Constataram-se diferenças significativas a 5% de confiança entre os momentos as variáveis: TC, PAS, PAD, PAM, InspISO, FeISO Sap e PPC pelo teste de Tukey. Com a correlação de Pearson TC/FR, FC/SpO2, FC/FR, FR/PAS, FR/PAD, FR/PAM, FR/PPC, Sap/PAS, PAD/Sap, PAM/Sap, EtCO2/SPO2, EtCO2/InsplSO, PAD/PAS, PAS/PAM, PAM/PAD, FelSO/InsplSO e Sap/PPC. Com base nos resultados concluímos que os valores de PVI, para a espécie ovina, com a metodologia empregada foi de 17,91 mL. Durante a realização da mielografia lombar ocorre aumento significativo da Sap (média de 101,87 mmHg), provocando grave redução da PPC.
The myelography is very accomplished in veterinary practice, however there are significant adverse effects associated with it. The aim of this research was to evaluate the possible effects of subarachnoid pressure, cardiorespiratory parameters (TC, FR, FC, PAS, PAD, PAM, EtCO2, SpO2, InspISO and FeISO) and pressure-volume index (PVI) in sheep otherwise healthy undergoing lumbar myelography. 8 healthy female sheep were used, which were pre-medicated with midazolam (0.5 mg / kg) anesthetic induction with propofol (3-6 mg / kg) and anesthesia maintained with isoflurane. First, the animals were submitted to the puncture of the cisterna magna and pressure monitoring. Subsequently, the lumbar myelography was performed by application of iohexol (300 mg / ml at rate 4.1 ml / min and a dose of 0.4 ml / kg). The time points studied were: immediately after anesthetic stabilization (M0) during a lumbar puncture (M1), two, four and six minutes after application of contrast (M2, M3 and M4, respectively). Subarachnoid pressure (Sap) was taken immediately after the atlanto-occipital punch (Sap0), the largest value during application of the contrast medium (Sapmax), two, four and six minutes after application of the contrast medium (SAP2, Sap3 and Sap4, respectively). They found significant differences at 5% confidence between times the variables TC, PAS, PAD, PAM, InspISO, FeISO Sap and PPC by Tukey test. With the Pearson correlation TC/FR, FC/SpO2, FC/FR, FR/PAS, FR/PAD, FR/PAM, FR/PPC, Sap/PAS, PAD/Sap, PAM/Sap, EtCO2/SPO2, EtCO2/InsplSO, PAD/PAS, PAS/PAM, PAM/PAD, FelSO/InsplSO and Sap/PPC Based on the results we conclude that the PVI values for the sheep, the methodology employed was 17.91 mL, close to normal values for adults of the human species. While performing the lumbar myelography is significant increase in Sap (average of 101.87 mmHg), causing severe reduction in PPC.
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Yauschew-Raguenes, Nathalie. "Dynamique saisonnière de la végétation forestière (arbres et sous-bois) dans le massif des Landes : application de la télédétection optique au suivi des hétérogénéités à l'échelle régionale." Thesis, Bordeaux 1, 2012. http://www.theses.fr/2012BOR14702/document.
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L’objectif de la thèse est d'évaluer l’apport des données satellites dans le suivi saisonnier de la végétation forestière (sous-bois et strate arborée). L'étude a été conduite sur la forêt landaise. Elle est basée sur une série de sept ans d'observations satellitaires décadaires d’un indice de végétation (PVI) et de mesures in situ de la surface foliaire (LAI) du sous-bois et des arbres. Tout d’abord, les observations in-situ ont été analysées. Elles montrent que le sous-bois est le déterminant majeur de la trajectoire saisonnière du LAI de l’ensemble du couvert végétal. Puis, ces informations ont été comparées aux données satellitaires. Il apparaît que la phénologie printanière du PVI renseigne sur celle du LAI du sous-bois. Enfin, ces résultats été exploités à l’échelle régionale et une carte régionale des types de landes a pu être produite. Cette étude ouvre des perspectives en matière d'intégration et de spatialisation des bilans d'eau et de carbone des écosystèmes forestiers à l'échelle régionaleThe aim of this thesis is to assess the potential of the remote sensing data to monitor the seasonal dynamic of the forest vegetation (understory and tree canopy). The study has been carried out on the maritime pine forest in the Southwest of France. It is based on a 7-year time-series of the 10-day vegetation index PVI composite derived from satellite and on in situ leaf area measurements (LAI) of understory and tree story.At first, the in situ observations have been analysed. It shows that the understory vegetation is the main driver of the seasonal dynamic of the whole forest LAI (understory+tree story). Then, these informations have been compared with the time-series of remote sensed PVI . It appears that the spring phenology of the PVI informs directly about the LAI understory one.Finally, these results have been used at the regional scale and a regional map of the lande types has been produced. This study opens some new prospects about integration and spatialisation of water and carbon balance of forest ecosystems at regional scale
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Liu, Hailong, Wenhua Qi, Qishan Zhang, and Jinpei Wu. "PKI/PMI AND SMART TOKENS IN HEALTHCARE INFORMATION SYSTEMS." International Foundation for Telemetering, 2003. http://hdl.handle.net/10150/606668.
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International Telemetering Conference Proceedings / October 20-23, 2003 / Riviera Hotel and Convention Center, Las Vegas, NevadaWhile healthcare industry is striving to achieve e-health systems for improvements in healthcare quality, cost, and access, privacy and security about medical records should be considered carefully. This paper makes a deep study of Public Key Infrastructures (PKIs) and Privilege Management Infrastructures (PMIs) and how they can secure e-health systems. To access resources, e.g. patient records, both authentication and authorization are needed, so public key certificates and attribute certificates are both required to protect healthcare information. From a typical medical scenario, we see not only static but also dynamic permissions are required. Dynamic authorization maybe the most complex problem in e-health systems.
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Bourget, Baptiste. "Ondes internes, de l'instabilité au mélange. Approche expérimentale." Thesis, Lyon, École normale supérieure, 2014. http://www.theses.fr/2014ENSL0912/document.
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Les ondes internes de gravité jouent un rôle important dans les échanges énergétiques océaniques, en particulier par leur mécanisme d'atténuation. Il est alors crucial de déterminer et de quantifier les différents processus permettant un transfert d'énergie vers les petites échelles et aboutissant ainsi au mélange océanique. Nous avons, pour cela, étudié précisément l'un de ces mécanismes: l'Instabilité Paramétrique Sous-harmonique (PSI). Cette instabilité permet la génération de deux ondes internes, de fréquence et de vecteurs d'ondes différents, à partir d'une onde primaire, par interaction non-linéaire résonante. L'étude expérimentale de cette instabilité a ainsi permis de mettre en évidence l'importance de certains paramètres (fréquence, amplitude, largeur de faisceau) quant au développement et à la sélection des ondes secondaires. Ces paramètres influent donc sur le transfert énergétique entre les échelles. En outre notre dispositif expérimental a permis de tester les limites de la théorie développée jusqu'à présent et a conduit à l'élaboration d'un nouveau modèle validé expérimentalement et numériquement.Par ailleurs, nous avons adapté la technique de Fluorescence Induite par Laser (LIF) à des fluides continûment stratifiés afin d'effectuer des mesures simultanées de vitesse (PIV) et de densité (LIF). Cette technique permet ainsi d'étudier expérimentalement l'effet de la propagation et de la déstabilisation des ondes internes de gravité sur une stratification linéaire, et d'accéder à des grandeurs associées au mélangeInternal waves are believed to be of primary importance as they affect energy transfer, especially their dissipation mechanism. Therefore it is crucial to identify and measure the different processes evolving a transfer to smaller scales and leading to oceanic mixing. We have chosen to focus on one of these mechanisms: the Parametric Subharmonic Instability (PSI). This instability allows the generation from a primary wave of two secondary internal waves, with different frequencies and waves vectors, by nonlinear resonant interaction. The experimental study of this instability has helped to highlight the importance of some parameters (frequency, amplitude, beam width) for the development and the selection of secondary waves. Thus these parameters affect the energy transfer between scales. Moreover, our experimental device was used to test the limits of the theory developed so far and has led to the development of a new model, which has been validated experimentally and numerically.In addition, we adapted the technique of Laser Induced Fluorescence (LIF) to continuously stratified fluids, with the aim of performing simultaneous measurements of velocity (PIV) and density (LIF). This technique allows us to study experimentally the effect of propagation and destabilization of internal gravity waves on a linear stratification, and to access to quantities related to the mixing
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Recco, Lucas Custódio [UNESP]. "Produção de Sensor Polimérico reforçado com Nanotubos de Carbono." Universidade Estadual Paulista (UNESP), 2016. http://hdl.handle.net/11449/144674.
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Neste trabalho foram estudadas síntese e caracterização de filmes finos híbrido de polímeros escovas constituídos de polieletrolíticos reforçados com nanotubos de carbono sobre o substrato de óxido de índio e estanho (ITO). Para a caracterização das superfícies dos filmes foram utilizadas as técnicas de microscopia eletrônica de varredura (MEV), energia dispersiva de raio-x (EDX) e espectroscopia Raman. Foram avaliadas diferentes propriedades estímulo-responsivas dos polímeros escovas que levam a modificações estruturais dos filmes como a influência de pH e da força iônica. Os polímeros escolhidos como modelos foram os polímeros Poli (Vinil Imidazol)-(PVI) e Poli (Àcido Acrilíco)-(PAA). Os ensaios eletroquímicos evidenciaram uma dependência da conformação dos polímeros escovas com a variação de pH e da força iônica e também revelaram o aumento da capacitância desses polímeros quando reforçados com os nanotubos de carbono, sendo que, o PVI obteve melhor resposta quando exposto a pH ácido, uma vez que suas cadeias poliméricas estavam estendidas e carregadas positivamente, permitindo a difusão da espécie redox carregada negativamente até a superfície do eletrodo. O PAA também obteve melhor resposta em meio ácido. Nesse caso as cadeias colapsadas aproximam os tubos do transdutor (ITO), facilitando a troca do par redox. Após a caracterização dos referidos polímeros, os mesmos foram testados como sensores para o monitoramento de hormônios e neurotransmissores que desempenham funções importantes no nosso organismo.
This study describes the synthesis and characterization of hybrid polyelectrolyte based on polymer brush reinforced multi-layer type carbon nanotubes. The characterization of the thin films we used the scanning electron microscopy techniques (SEM), energy dispersive x-ray (EDX) and Raman spectroscopy . The influence of pH and ionic strength were evaluated by electrochemical technique. The polymers Poly (vinyl imidazole) - (PVI) and poly (acrylic acid) - (PAA) were used as matrix brush for anchoring the nanotubes. Electrochemical tests showed a dependence of the conformation of the brush polymers with pH change and ionic strength, and also showed the increase in capacitance of these polymers when reinforced with carbon nanotubes, and the PVI obtained a better response when exposed to acidic pH since its polymer chains were extended and positively charged, allowing the diffusion of negatively charged redox species to the electrode surface. The PAA also obtained better response in acid. In this case the collapsed chains near the transducer tubes (ITO) facilitate the electrons transference. The made electrodes were applied to monitor hormones and neurotransmitters that play important functions in our body.
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Oliveira, Maria José Alves de. "Obtenção de membranas de hidrogéis para tratamento alternativo de Leishmaniose Tegumentar." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/85/85134/tde-08082013-170247/.
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Os hidrogéis foram obtidos a partir de material polimérico reticulado por processo de radiação ionizante de acordo com a técnica de Rosiak. Nos últimos 40 anos o uso dos hidrogéis têm sido investigado para diversas aplicações como curativos. Neste trabalho foram sintetizadas membranas de hidrogéis com poli(N-2- pirolidona) (PVP), poli(álcool vinílico) (PVAl), quitosana e argila laponita em encapsulamento do fármaco para liberação controlada de glucantime sobre a superfície cutânea de tecidos lesados por leishmaniose. O tratamento tradicional dos pacientes infectados pelos parasitas é feito com antimoniato pentavalente de forma injetável. Entretanto estes antimoniatos são muito tóxicos e provocam efeitos colaterais nestes pacientes, além disso, pacientes portadores de doenças cardíacas e renais não podem fazer uso deste tratamento. No tratamento com membranas de hidrogéis aplicadas na superfície de tecidos lesados pela leishmaniose, o fármaco é liberado diretamente no ferimento de forma controlada, diminuindo os efeitos colaterais. As membranas preparadas neste trabalho foram caracterizadas por difração de raios X (DRX), análise de termogravimetria (TG), intumescimento, fração gel, espectroscopia no infravermelho (FTIR), microscopia eletrônica de varredura (MEV) e microscopia de força atômica (AFM). As caracterizações funcionais foram feitas com teste de citotoxicidade e de liberação do fármaco in vitro e in vivo, de acordo com o protocolo de ética do Instituto de Medicina Tropical do Hospital das Clinicas da Faculdade de Medicina da USP. O teste \"in vivo\" dessas membranas provou ser eficiente na liberação controlada de fármacos diretamente nas superfícies lesadas pela leishmaniose. Nos testes \"in vivo\" as membranas de PVP/PVAl/argila 1,5% e glucantime apresentaram evidente contribuição para redução do ferimento chegando a uma cura clínica.Polymeric Hydrogels formed by crosslinked polymeric chains were obtained by ionizing radiation process according to Rosiak technique. In the last 40 years the use of hydrogels has been investigated for various applications as curatives. In this work hydrogel membranes were synthesized with poly (N-2-pyrrolidone) (PVP), poly (vinyl alcohol) (PVA), chitosan and laponita clay for use as a vehicle for controlled glucantime release on the surface of skin tissues injured by leishmaniasis. Leishmaniasis is a disease caused by a protozoan parasite of the genus Leishmania transmitted by the bite of phlebotomies sandfly. The traditional treatment of patients infected by these parasites is done with pentavalent antimony in injectable form. However, these antimonates are highly toxic and cause side effects in these patients. In addition, patients with heart and kidney disease can not use this treatment. In treatment with drug delivery hydrogel membrane applied on the surface of leishmaniasis injured tissues the drug is released directly to the wound in a controlled manner, reducing the side effects. Membranes prepared in this study were characterized by X-ray diffraction (XRD), thermogravimetric analysis (TG), swelling, gel fraction, infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and atomic force microscopy (AFM). The characterizations of cytotoxicity and drug release were made \"in vitro\" and \"in vivo\" with functional test according to ethical protocol of the Division of Infectious and Parasitic Diseases at the Hospital of Clinics, São Paulo University-School of Medicine, University. The \"in vivo\" test of these membranes proved to be effective in controlled release of drugs directly into leishmaniasis damaged tissues. Results of \"in vivo\" tests using PVP/PVAl / clay 1,5% and glucantime membrane showed remarkable contribution to wound reduction and cure in clinical therapy.
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Makhoul, Khaldoun. "CP violation in flavor-tagged Bs̳ --> J/[psi][phi] decays." Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/53233.
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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 2009.In title on title page, [psi][phi] appears as lower case Greek letter italic and double underscored "s" appears as subscript. Cataloged from PDF version of thesis.
Includes bibliographical references (p. 193-200).
In this dissertation, we present the results of a time-dependent angular analysis of Bs -+ J/,0 decays performed with the use of initial-state flavor tagging. CP violation is observed in this mode through the interference of decay without net mixing and decay with net mixing, that is, Bs -- J/0 and Bs -+ B, -+ J/q0. The time-dependent angular analysis is used to extract the decay widths of the heavy and light B, eigenstates and the difference between these decay widths AF, - FL - FH. Initial-state flavor tagging is used to determine the matter-antimatter content of the B. mesons at production time. We combine flavor tagging with the angular analysis, which statistically determines the contributions of the CP-even and CP- odd components at decay time, to measure the CP-violating phase 0,. The phase 3, is expressed in terms of elements of the Cabibbo-Kobayashi-Maskawa matrix as s - arg (-VtsV4/VcsV*b), and is predicted by the Standard Model to be close to zero, O3SM = 0.02. In the measurement of AF,, we use a dataset corresponding to 1.7 fb- of luminosity, collected at the CDF experiment from proton-antiproton collisions at a center of mass energy f = 1.96 TeV. In the measurement of Ps, we use a dataset corresponding to 1.3 fb-1 of collected luminosity. We measure AF, = (0.071+0.064 ± 0.007) ps-1 using the time-dependent angular analysis. Combining the angular analysis with flavor-tagging, we find that assuming the Standard Model predictions of p/ and AF,, the probability of a deviation as large as the level of the observed data is 33%. We obtain a suite of associated results which are discussed in detail in this dissertation alongside the main results.
by Khaldoun Makhoul.
Ph.D.
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Cabrera, Sotelo Julieta Gladys. "Hidrogeles de PVA-PVP conteniendo nanopartículas de plata obtenidos por radiación gamma." Universidad Nacional de Ingeniería. Programa Cybertesis PERÚ, 2009. http://cybertesis.uni.edu.pe/uni/2009/cabrera_sj/html/index-frames.html.
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Santos, Fernanda Henriques dos 1980. "Caracterização de polivinilálcool e polivinilpirrolidona (PVAI/PVP) para reparo de cartilagem articular mandibular." [s.n.], 2011. http://repositorio.unicamp.br/jspui/handle/REPOSIP/263590.
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Orientadores: Cecília Amélia de Carvalho Zavaglia, Vanessa Petrilli BavarescoDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecânica
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Resumo: Na área médica, para se desenvolver um dispositivo que funcione como implante, deve-se utilizar materiais que sejam compatíveis para funções específicas do corpo humano, e esses são classificados como biomateriais. Neste trabalho, foram determinados os parâmetros que serão aplicados ao laser de infravermelho (condutividade térmica do material, densidade do material e comprimento de onda do laser) utilizado na máquina de prototipagem rápida, a qual será usada para a fabricação do implante. Este implante será composto por um biomaterial polimérico a base de Polivinilalcool (PVAl) e, terá como objetivo a substituição da cartilagem articular mandibular. Estudos já avaliaram as propriedades mecânicas de hidrogéis poliméricos de PVAl mostrando sua aplicabilidade como reparadores da cartilagem articular em articulação de quadril, porém a articulação mandibular é submetida à aplicações de cargas superiores havendo a necessidade de melhoria de suas propriedades mecânica. A mistura física de dois ou mais polímeros é denominada blenda polimérica e seu objetivo é aperfeiçoar ou modificar as propriedades dos materiais adequando-as para uma aplicação específica. A literatura relata que PVAl e Polivinilpirrolidona (PVP) são polímeros miscíveis entre si e, quando não reticulados são solúveis em água. O PVP é um polímero amorfo e autolubrificante, e por isso, foi escolhido para melhorar as propriedades mecânicas do PVAl. Blendas nas composições de 90:10 de PVAl e PVP respectivamente, reticuladas via laser infravermelho utilizando concentração de 2,5% de termoiniciador cianovalérico foram caracterizadas via Espectroscopia do Infravermelho Médio, Calorimetria Exploratória Diferencial (DSC), Microscopia Eletrônica de Varredura (MEV) e Extração sol-gel. Através desses experimentos foram determinados os parâmetros do laser para posterior utilização na máquina de prototipagem rápida. Foi possível também realizar a cura do material através do laser de infravermelho. A cura foi confirmada através dos outros ensaios realizados
Abstract: In the medical area to develop a device that functions as an implant, one should use materials that are compatible for specific functions of the human body, and these are classified as biomaterials. In this study, we determined the laser parameters that will be applied to the infrared laser (thermal conductivity, material density and wavelength of the laser) in rapid prototyping machine, which will be used to manufacture the implant. This implant is a polymeric biomaterial based on polyvinylalcool (PVAl) and will aim to replace the articular cartilage of the mandible. Studies have evaluated the mechanical properties of polymeric hydrogels PVAl showing its applicability as repairing articular cartilage in hip joint, but the mandibular joint is subjected to loads greater than applications having the need to improve their mechanical properties. The physical mixture of two or more polymers is called polymer blend and its goal is to improve or modify the properties of materials making them suitable for a specific application. The literature reports that PVAl and PVP polymers are miscible and, when not crosslinked, are soluble in water. PVP is an amorphous polymer and selflubricating, and therefore was chosen to improve the mechanical properties of PVAl. Blends in the compositions of 90:10 PVAl and PVP respectively, crosslinked using infrared concentration of 2.5% termoiniciador cianovaléric were characterized by mid-infrared spectroscopy, Differential Scanning Calorimetry (DSC), Scanning Electron Microscopy (SEM) and sol-gel fraction. Through these experiments were determined laser parameters for subsequent use in rapid prototyping machine. It was also possible to realize the cure of material through the infrared laser. The cure was confirmed by other tests
Mestrado
Materiais e Processos de Fabricação
Mestre em Engenharia Mecânica
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Amaral, Renata Hage. "Estudo da incorporação e liberação de um extrato de algas vermelhas em membranas de hidrogel." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/85/85134/tde-16112009-145201/.
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Os hidrogéis estão dentre as matrizes poliméricas mais utilizadas em tecnologia farmacêutica em razão de sua vasta aplicação e funcionalidade, especialmente em sistema de liberação de fármacos. Tendo em vista o grande avanço nas inovações dos produtos cosméticos, tanto por meio da introdução de novos princípios ativos quanto pelas matrizes utilizadas para liberação controlada dos mesmos, o objetivo deste trabalho foi incorporar e avaliar a liberação de um princípio ativo natural, o ArctAlg®, em membranas de hidrogel, de modo a obter um dispositivo de liberação para fins cosméticos. O ArctAlg® é um extrato aquoso que possui uma excelente ação anti-oxidante, lipolítica, anti-inflamatória e citoestimulante. Foi realizado o estudo das propriedades mecânicas, físicoquímicas e a biocompatibilidade in vitro das membranas de hidrogéis de poli(vinil- 2- pirrolidona) (PVP) e poli(vinil álcool) (PVA) obtidas pela reticulação por radiação ionizante. A caracterização físico-química das matrizes poliméricas foi obtida pelos ensaios de fração gel e intumescimento e o de biocompatibilidade in vitro pelo ensaio de citotoxicidade pelo método de incorporação do vermelho neutro. No ensaio de fração gel tanto o hidrogel de PVP quanto o de PVA apresentaram um alto grau de reticulação. O hidrogel de PVP apresentou uma maior porcentagem de intumescimento em relação ao de PVA e no ensaio de citotoxicidade os hidrogéis mostraram-se atóxicos. A propriedade citoestimulante do ArctAlg® foi verificada no ensaio de citoestimulação com células fibroblásticas de pele de coelho, em que foi evidenciado um aumento de cerca de 50% das células quando em contato com 0,5% do princípio ativo. As membranas de hidrogel preparadas com 3% de ArctAlg® foram submetidas ao ensaio de liberação em incubadora a 37ºC e as alíquotas coletadas durante o ensaio foram quantificadas por cromatografia líquida de alta eficiência (HPLC). Os resultados obtidos na cinética de liberação mostraram que as membranas de hidrogel de PVP liberaram cerca de 50% do ArctAlg® incorporado e as de PVA em cerca de 30%. No ensaio de citoestimulação do ArctAlg® liberado, o dispositivo de PVP apresentou um aumento em cerca de 80% da população celular em relação ao controle do ensaio, mostrando ser o dispositivo mais indicado para ser utilizado em processos de reparação cutânea.In pharmaceutical technology hydrogel is the most used among the polymeric matrices due to its wide application and functionality, primarily in drug delivery system. In view of the large advance innovations in cosmetic products, both through the introduction of new active agents as the matrices used for its controlled release, the objective of this study was to evaluate the release and immobilization of a natural active agent, the Arct\'Alg® in hydrogel membranes to obtain a release device for cosmetics. Arct\'Alg® is an aqueous extract which has excellent anti-oxidant, lipolytic, anti-inflammatory and cytostimulant action. Study on mechanical and physical-chemical properties and biocompatibility in vitro of hydrogel membranes of poly(vinyl-2- pyrrolidone) (PVP) and poly(vinyl alcohol) (PVA) obtained by ionizing radiation crosslinking have been performed. The physical-chemical characterization of polymeric matrices was carried out by gel fraction and swelling tests and biocompatibility by in vitro test of cytotoxicity by using the technique of neutral red incorporation. In the gel fraction test, both the PVP and PVA hydrogel showed a high crosslinking degree. The PVP hydrogel showed a greater percentage of swelling in relation to PVA and the cytotoxicity test of the hydrogels showed non-toxicity effect. The cytostimulation property of Arct\'Alg® was verified by the cytostimulation test with rabbit skin cells, it was showed an increase at about 50% of the cells when in contact with 0,5% of active agent. The hydrogel membranes prepared with 3% of Arct\'Alg® were subjected to the release test in an incubator at 37°C and aliquots collected during the test were quantified by high performance liquid chromatography (HPLC). The results obtained in the kinetics of release showed that the PVP hydrogel membranes released about 50% of Arct\'Alg® incorporated and the PVA hydrogel membranes at about 30%. In the cytostimulation test of released Arct\'Alg®, the PVP device showed an increase at about 80% of cell population in relation of test control, showing to be the greater device to be used in processes of skin repair.
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Farias, Italo Fernando. "Estudo da influência da radiação gama nas propriedades mecânicas e térmicas de \"elastômeros termoplásticos\" blendas de poli (cloreto de vinila) com poli (vinil butiral)." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/85/85134/tde-11102018-083413/.
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A vasta gama de sistemas poliméricos classificados como blendas tem sido alvo crescente no meio acadêmico e científico. A possibilidade de obtenção de propriedades combinadas e múltiplas, associada a incorporações de blendas poliméricas, enriquece a condição de pesquisa abrindo assim uma extensa área de atuação. Neste trabalho foi proposto o estudo de mistura de composto de poli (cloreto de vinila) plastificado com resíduo de poli (vinil butiral), proveniente de laminados para produção de para-brisas da indústria automotiva, bem como a investigação do efeito da irradiação gama com dose absorvida de 25 kGy, 30 kGy e 40 kGy, controlado com uso de dosímetro de PMMA e taxa de dose equivalente de 0-10 kGy.h-1. Foram analisadas variações das propriedades mecânicas e térmicas das amostras antes e após exposição à radiação gama. As formulações foram constituídas em diferentes concentrações: composto de PVC-C, resíduo de PVB-R, PVC-C/PVB-R 90/10, PVC-C/PVB-R 50/50 e PVC-R/PVB-R 50/50. O composto de poli (cloreto de vinila) foi formulado e aditivado, apresentando comportamento de um elastômero termoplástico, produto flexível. Foram incorporadas aparas moídas de poli (vinil butiral), provenientes de laminados para produção de para-brisas. Ambos os materiais foram incorporados em extrusora granuladora tipo rosca simples e submetidos ao processo de calandragem para efetivação da mistura e formação de mantas plásticas. As mantas foram irradiadas em um reator multipropósito de 60Co e caracterizadas para verificação das propriedades mecânicas e térmicas. Para tanto, as blendas após exposição à radiação gama apresentaram propriedades mecânicas e térmicas intermediarias as propriedades dos seus componentes, mostrando-se um material resistente e de baixo custo. Por meio da microscopia eletrônica de varredura obteve uma redução nos vasos interfaciais mostrando um aumento na capacidade de percolação do PVB na matriz de PVC, favorecendo suas propriedades físicas.The wide range of polymer systems classified as blends has been increasingly targeted in the academic and scientific milieu. The possibility of obtaining multiple and combined properties, combined with the incorporation of polymer blends, enriches the research condition, thus opening up an extensive area of performance. In this work the study of the poly (vinyl butyral) plasticized polyvinyl chloride mixture from laminates for automotive windshield production was investigated, as well as the investigation of the effect of gamma irradiation with absorbed dose of 25 kGy, 30 kGy and 40 kGy, controlled with use of PMMA dosimeter and equivalent dose rate of 0-10 kGy.h-1. Variations of the mechanical and thermal properties of the samples were analyzed before and after exposure to gamma radiation. The formulations were constituted in different concentrations: PVC-C compound, PVB-R residue, PVC-C/PVB-R 90/10, PVC-C/PVB-R 50/50 and PVC-R/PVB-R 50/50. The polyvinyl chloride compound was formulated and added, exhibiting the behavior of a thermoplastic elastomer, a flexible product. Poly (vinyl butyral) ground chips were produced from laminates for the production of windshields. Both materials were incorporated in a single-thread granulator extruder and submitted to the calendering process to effect the mixing and formation of plastic blankets. The blankets were irradiated in a 60Co multipurpose reactor and characterized for verification of mechanical and thermal properties. In order to do so, the blends after exposure to gamma radiation presented mechanical properties and intermediate thermal properties of their components, showing a resistant material and low cost. By means of the scanning electron microscopy it obtained a reduction in the interfacial vessels showing an increase in the percolation capacity of the PVB in the PVC matrix, favoring its physical properties.
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Khanji, Basem. "Recherche de nouvelle physique dans le canal B0s --> J/psi phi auprès de l'expérience LHCb." Phd thesis, Université de la Méditerranée - Aix-Marseille II, 2011. http://tel.archives-ouvertes.fr/tel-00631168.
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Recherche de nouvelle physique dans le canal B0s --> J/psi phi auprès de l'expérience LHCb: Dans le Modèle Standard, la différence de phase apparaissant dans la désintégration B0s --> J/psi phi est prèdite avec une grande précision. Cette observable est une sonde pour mettre en évidence de la Nouvelle Physique car l'oscillation B0s -B0sbar s'effectue via un diagramme en boucles sensible à la nouvelles particules. Nous avons développé une sélection simplifiée pour les données de 2010. Elle évite tous biais sur la distribution en temps propre afin de réduire l'incertitude systématique. De plus, nous contrôlons les performances d'étiquetage pour les événements B0s --> J/psi phi en utilisant les canaux similaires B0d--> J/psi K*0 et B+ --> J/psi K+. Avec les données de 2010, nous obtenons 570 événements de signal avec une luminosité intégré de 36 pb−1, une puissance de d'étiquetage de (2, 2 ± 0, 4)% et une résolution temporelle de 50 fs. Nous avons étudié une sélection alternative, qui maximise la sensibilité à la phase phis en utilisant des coupures biasant le temp propre. Nous avons proposé une méthode pour corriger la déformation de temps propre à partir des données. Nous avons développé un programme d'ajustement pour déterminer la phase phis. Avec les données 2010, la valeur touveé est phis = [−2, 7,−0, 5] rad à 68% de confiance. Ce résultat est compatible avec la prédiction du Modèle Standard.
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Hong, Sathapanaroth Satha. "Modélisation de dispersions eau-VCM-PVC en présence de tensio-actifs macromoléculaires à base de PVA." Mulhouse, 2005. http://www.theses.fr/2005MULH0784.
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L'objectif de cette étude est de préparer et de caractériser des nanoparticules à base d'alcool polyvinylique (PVA) qui pourront par la suite être utilisées comme stabilisants particulaires de type "Pickering" lors de la polymérisation en suspension du chlorure de vinyle (VCM). Du fait de la toxicité du VCM, un solvant modèle, le chlorobutane (CIBu), est utilisé à la place du VCM dans l'étude de l'émulsion de départ. Nous avons ainsi montré qu'il est possible d'o6tenir, par un procédé de coacervation, des dispersions aqueuses à base de PVA formées de nanoparticules colloïdales monodisperses en taille, de diamètre compris entre 150 et 300 nm. Les différentes techniques de caractérisation utilisées ont permis de mettre en évidence une structure sphérique de type "coeur-couronne" des nanoparticules dont la composition joue un rôle important sur leur capacité à stabiliser l'émulsion CIBu/eau, une stabilisation de type "Pickering" étant plus favorable qu'une stabilisation purement stériqueThe objective of this study was to prepare and to characterize colloidal particles based on polyvinyl alcohol (PVA) which could be used as particie stabilizers, called "Pickering" stabilizers, in suspension polymerization of vinyl chloride (VCM). Due to VCM toxicity, a model solvent, butyl chloride (CIBu), is used instead of VCM in the initial emulsion study. We have shown that it is possible to obtain, with a coacervation technique, aqueous dispersions based on PVA formed by colloidal particles monodispersed in size, with a diameter between 150 and 300 nm. Different characterization techniques, enabied to demonstrate a spherical "core-shell" structure of the nanoparticles which composition plays an important role on their ability to stabilise CIBu/water emulsion, a "Pickering" stabilisation being better than a pure steric stabilisation
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Quispe, Sagastegui Jose Andy, Schilder Luisiana Rioja, Manuel Silvera, and Jose Reyes. "Pavement management system to improve local road administration using PCI, IRI and PSI for pavement failures identification." Institute of Electrical and Electronics Engineers Inc, 2020. http://hdl.handle.net/10757/656415.
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El texto completo de este trabajo no está disponible en el Repositorio Académico UPC por restricciones de la casa editorial donde ha sido publicado.A pavement management system (PMS) is a tool that supports decision-making specialists to maintain the pavement at an optimal service level. The absence of a PMS could lead to inadequate decision-making, a disorganized road inventory, poor selection in road maintenance techniques and inefficient technical support to justify the execution of maintenance activities. For these reasons, this research proposes the application of a PMS, with the objective of improving and standardizing the processes for evaluating the condition of roads that are under the jurisdiction of low-budget government organizations, guaranteeing the selection of the most appropriate type of maintenance. As a case of study, a 1.1 km local road located in one of the districts of Lima was evaluated, which was divided into 11 sections. With this evaluation, it was obtained that 2,605.43 m2 of the total road is in poor condition, due to the presence of functional failures. For the identification of failures, the pavement condition index (PCI), the international roughness index (IRI) and the present serviceability index (PSI) were used to determine the condition, roughness and serviceability of the pavement. In conclusion, it was identified that the proposed PMS is adequately adapted to the way of working and available budget of a local administration, since if it is applied it would only spend 20.55% of the fund that would be destined to a total reconstruction of road.
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Bursztein, Jean-Gérard. "Incommensurabilité entre psychanalyse et neurosciences : réflexion à partir du Projet-programme freudien (phi, psi, omega) de 1895." Paris 10, 2003. http://www.theses.fr/2003PA100063.
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La thèse porte sur le statut scientifique de la psychanalyse sur la transformation du principe d'inertie sur l'incommensurabilité entre psychanalyse et neurosciences. Elle se compose de trois parties : 1° explication du projet Freudien de 1895 2° situation du projet Freudien de 1895 dans l'histoire des sciences (HELMHOLTZ) 3° critique et incommensurabilité entre psychanalyse et neurosciencesThis thesis deals with the scientific status of psychanalysis of the transformation of the principe of inertia. It is composed in three parts : 1° exploration of the Freudian project of 1895 2° situation of the Freudian project into the history of sciences (HELMHOLTZ) 3° critics and incommensurability between psychanalysis and neurosciences
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Cyr, Linda. "Apport des indices de végétation pour l'évaluation de la couverture du sol en vue d'une modélisation spatiale de l'érosion." Mémoire, Université de Sherbrooke, 1993. http://hdl.handle.net/11143/11136.
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Résumé : Au Québec méridional, la principale source de dégradation du sol est l'érosion causée par la pluie. L'augmentation de la monoculture en rangs dans les secteurs à topographie accidentée, tel que l'Estrie, accroît les risques d'érosion hydrique. En effet, ce type de culture laisse les champs à découvert, sans protection, au cours des mois de l'année les plus propices à l'érosion hydrique. On peut alors affirmer que les risques d'érosion varient en fonction de plusieurs facteurs, en particulier le degré de protection offert par le couvert végétal en place. Ainsi, pour l'amélioration du calcul des pertes de sol causée par l'érosion hydrique, il devient important de pouvoir calculer le plus précisément possible le pourcentage de couverture au sol de différentes cultures pour une saison végétative, en plus de l'érosivité des pluies dont l'agressivité varie dans le temps et dont l'effet est intimement relié au couvert en place. Des mesures radiométriques (CIMEL) et photographiques furent prises sur le terrain à intervalle d'environ dix jours pour six cultures dominantes. Les mesures radiométriques nous permettent de calculer les indices de végétation tandis que les photographies servent à estimer le taux de couverture végétale pour une saison végétative. L'utilisation d'images SPOT multidates va permettre de déterminer les relations entre les indices de végétation mesurés sur le terrain et ceux calculés avec l'imagerie satellitaire. Par la suite, la relation entre le taux de couverture et les indices de végétation pour chaque culture est établie. Les résultats démontrent différents comportements en terme de couvert, qui correspondent aux périodes de forts et faibles risques d'érosion hydrique pour une saison végétative. Il est également intéressant de constater que l'indice de végétation, en général, surestime le taux de couverture en début de saison et le sous-estime en fin de saison végétative. De plus, la sénescence pose un problème au calcul du taux de couverture à l'aide des indices de végétation, ces cerniers ayant été conçu pour l'estimation de la végétation verte vivante.|| Abstract : In southern Quebec, the main source of soil degradation is erosion induced by rain fall. The growing use of in-row crop planting practices in areas of rough terrain, such as The Eastern Townships, increases the risk of water erosion. These agricultural practices leave the bare soil with no protection during the months of high erosion risk. Erosion risks are related to several factors however, the main factor is the level of protection offered by the vegetation cover. To achieve more accurate results from the Universal Soil Loss Equation, the percentage of ground cover for different crop types should be calculated as precisely as possible, for an entire growing season. It is equally important to measure the strength and quantity of rainfall over the affected area. Field radiometric and photographic data were taken on an interval of approximately ten days for six main crop types. The radiometric measurements allow us to calculate the vegetation indices and the photographic measurements are used to calculate the amount of vegetal cover throughout a growing season. The use of multitemporal SPOT imagery assisted in establishing the relationship between the vegetation indices calculated from the field data, and the ones calculated from the satellite imagery. The relationship between the amount of vegetation ground cover and the vegetation indices for each crop type was then calculated. The results show different behaviours in terms of cover, which are related to the periods of high and low water erosion over a growing season. We can also observe that as a general rule the vegetation indices over-estimate the amount of vegetation ground cover at the beginning of the growing season and under-estimate it at the end. Senescent vegetation creates a problem when calculating the amount of ground cover with the indices since the indices were created to estimate living vegetation.
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Demerjian, Jacques. "Services d'autorisation et Intégration au protocole d'attribution dynamique des adresses." Paris, ENST, 2004. http://www.theses.fr/2004ENST0036.
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La sécurité est un enjeu majeur des technologies numériques modernes. Avec le développement de l'Internet, les besoins de sécurité sont de plus en plus importants. Le développement d'applications Internet telles que le commerce électronique implique de nouveaux besoins comme, l'identification des entités communicantes, l'authentification des entités, l'anonymat du propriétaire du certificat, la procuration, etc. Qu'il s'agisse de données médicales, fiscales ou bancaires, le besoin en sécurité est essentiel afin de crédibiliser le système, tout en respectant à la fois les besoins des utilisateurs et des applications. Cette sécurité a néanmoins un prix : celui de l'établissement de la confiance entre les partenaires en communication. La confiance des utilisateurs passe par la sécurisation des transactions, par exemple au moyen d'une procédure de certification, et la reconnaissance des signatures électroniques. Malgré la diversité des certificats numériques existants (certificat d'identité X509, SPKI, certificat d'attributs, etc. ), ils sont encore limités, génériques et répondent ainsi insuffisamment aux besoins spécifiques des applications électroniques et des utilisateurs. D'où la nécessité de spécifier une nouvelle approche pour la génération de certificats numériques répondant à ces exigences, légers, simplifiés et plus ouverts que ceux existants. Les travaux de recherche présentés dans cette thèse consistent à proposer une nouvelle approche pour la génération de certificats numériques pour contribuer aux services d'autorisation, puis à intégrer cette contribution au protocole d'attribution dynamique des adresses DHCP afin de renforcer sa sécurité. Security is a major stake of modern numerical technologies. With the development of the Internet, the needs for security are increasingly becoming more important than ever before. The development of Internet applications such as e-business, medical applications or videoconference, implies new needs such as, identification of the communicating entities, integrity of the exchanged messages, confidentiality of the transaction, authentication of the entities, anonymity of the certificate owner, procuration, etc. Whether they are medical, tax or banking related data, the requirement in security is essential in order to give credibility to the system, while respecting at the same time users' and applications' needs. This security has nevertheless a price: that of the establishment of trust between communicating partners. Users' trust goes through transactions security, for example by means of a certification procedure, and the recognition of electronic signatures. Despite the diversity of existing certificates (X. 509 identity certificate, SPKI, attributes certificate, etc), they are still limited, generic and thus, meet insufficiently the specific needs of electronic applications and users. Hence, the need for specifying a new approach for the generation of certificates answering these requirements, light, simplified and more open than those existing. The research tasks presented in this thesis consist in proposing a new approach for the generation of certificates to contribute to the authorization services, then to integrate this contribution to DHCP (Dynamic Host Configuration Protocol) in order to reinforce its security
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Maurice, Emilie. "Mesure de la violation de CP dans les désintégrations Bs -> J/psi phi auprès du détecteur LHCb." Phd thesis, Aix-Marseille Université, 2012. http://tel.archives-ouvertes.fr/tel-00742181.
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La mesure de la phase phis violant la symétrie CP dans les désintégrations Bs -> J/psi phi est une des analyses phares de l'expérience LHCb. Le Modèle Standard prédit cette observable avec une faible incertitude théorique. La présence de Nouvelle Physique notamment dans les diagrammes en boucle de l'oscillation Bs - anti Bs peut significativement modifier la mesure de cette phase. Durant cette thèse, nous avons participé à différents aspects de l'analyse des désintégrations Bs -> J/psi phi. Nous avons proposé une sélection multi-variables, basée sur un algorithme d'arbres de décision boostés. Cette nouvelle sélection augmente le nombre de signal Bs -> J/psi phi de 19% mais nécessite une correction temporelle. Une étude portant sur l'origine des distorsions angulaires caractéristiques des désintégrations Bs -> J/psi phi a aussi été menée. Il s'avère que la principale source de distorsion est la géométrie du détecteur LHCb. Nous avons aussi contribué à un autre élément clef de cette analyse : l'étiquetage de la saveur. Afin de connaître la saveur initiale des mésons B, un algorithme d'étiquetage a été développé. Il exploite les traces chargées provenant du hadron B de côté opposé. Nous avons participé à son optimisation ainsi qu'à son étalonnage en étudiant les désintégrations Bd -> J/psi K*. En utilisant l'intégralité des données enregistrées en 2011, soit 1 fb-1, après optimisation et calibration de cet algorithme, la puissance d'étiquetage dans le canal Bs -> J/psi phi est : (2.29 +- 0.07 +- 0.26) %. La valeur de phis mesurée est alors : \phis = -0.001 +- 0.101 +- 0.027 rad dans les désintégrations Bs -> J/psi phi. L'analyse combinée de Bs -> J/psi phi avec les désintégrations Bs -> J/psi \pi+ \pi- donne la meilleure mesure mondiale de \phis = -0.002 +- 0.083 +- 0.027 rad. Cette mesure est compatible avec le Modèle Standard, mais ses incertitudes laissent possible la présence de Nouvelle Physique.
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Pajvani, Mehulkumar. "Universal celebrity endorser and interaction between perceived celebrity image (PCI) And perceived brand image(PBI) across national boundaries." Thesis, University of Leeds, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.511170.
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AMARAL, RENATA H. "Estudo da incorporacao e liberacao de um extrato de algas vermelhas em membranas de hidrogel." reponame:Repositório Institucional do IPEN, 2009. http://repositorio.ipen.br:8080/xmlui/handle/123456789/9445.
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Made available in DSpace on 2014-10-09T12:26:52Z (GMT). No. of bitstreams: 0Made available in DSpace on 2014-10-09T14:06:12Z (GMT). No. of bitstreams: 0
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Reddy, Keerthi, Mary Kearns, Santiago Alvarez‐Arango, Ismael Carrillo‐Martin, Nathaly Cuervo‐Pardo, Lyda Cuervo‐Pardo, Ves Dimov, et al. "Youtube and Food Allergy: An Appraisal of the Educational Quality of Information." Digital Commons @ East Tennessee State University, 2018. https://doi.org/10.1111/pai.12885.
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Background: Food allergy affects an estimated 8% of children and 3% of adults in the United States. Food‐allergic individuals increasingly use the web for medical information. We sought to determine the educational quality of food allergy YouTube videos.
Methods: We performed a YouTube search using keywords “food allergy” and “food allergies”. The 300 most viewed videos were included and analyzed for characteristics, source, and content. Source was further classified as healthcare provider, alternative medicine provider, patient, company, media, and professional society. A scoring system (FA‐DQS) was created to evaluate quality (−10 to +34 points). Negative points were assigned for misleading information. Eight reviewers scored each video independently.
Results: Three hundred videos were analyzed, with a median of 6351.50 views, 19 likes, and 1 dislike. More video presenters were female (54.3%). The most common type of video source was alternative medicine provider (26.3%). Alternative treatments included the following: water fast, juicing, Ayurveda, apple cider, yoga, visualization, and sea moss. Controversial diagnostics included kinesiology, IgG testing, and pulse test. Almost half of the videos depicted a non‐IgE‐mediated reaction (49.0%).Videos by professional societies had the highest FA‐DQS (7.27). Scores for videos by professional societies were significantly different from other sources (P < .001). There was a high degree of agreement among reviewers (ICC = 0.820; P < .001).
Conclusion: YouTube videos on food allergy frequently recommend controversial diagnostics and commonly depict non‐IgE‐mediated reactions. There is a need for high‐quality, evidence‐based, educational videos on food allergy.
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Presland, A. D. "Identification and measurement of low energy electrons and the decay B'0â†s->J/#psi##phi# at CMS." Thesis, University of Bristol, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.367940.
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Augry, Ludivine. "Contrôle des mécanismes d'interactions nanocharge/polymère en milieu solvant : application aux revêtements à base de PVC et de PAI." Phd thesis, INSA de Lyon, 2011. http://tel.archives-ouvertes.fr/tel-00965287.
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Ce travail de thèse a consisté à améliorer certaines propriétés de revêtements fonctionnels à base de polychlorure de vinyle (PVC) plastifié et de polyamide-imide (PAI) par incorporation de nanocharges inorganiques préformées, lamellaires ou divisées. La compatibilisation des nanocharges avec la matrice dans laquelle elles ont été incorporées s'est avérée indispensable pour obtenir des films nanocomposites avec une distribution homogène et un état de dispersion le plus fin possible. Différentes stratégies de compatibilisation ont été étudiées, comme la physisorption, la chimisorption, l'intercalation ou encore la chélation d'agents compatibilisants judicieusement choisis et adaptés à chacun des systèmes. Les nouvelles nanocharges ainsi modifiées ont été caractérisées en vue de leur introduction dans la matrice. Les films nanocomposites " compatibilisés " ont été élaborés en voie solvant et/ou par polymérisation in-situ, suivie d'une gélification physique pour le PVC ou d'une réticulation chimique pour le PAI. La caractérisation morphologique des films, réalisée par DRX et MEB/MET, ainsi que les propriétés thermiques et thermomécaniques des films, évaluées par ATG, DSC et DMA, mettent en évidence l'importance de deux paramètres : la chimie de surface des nanocharges, à l'origine des interactions interfaciales nanocharge/polymère, et le procédé d'élaboration du nanocomposite.
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Augry, Ludivine. "Contrôle des mécanismes d’interactions nanocharge/polymère en milieu solvant : application aux revêtements à base de PVC et de PAI." Thesis, Lyon, INSA, 2011. http://www.theses.fr/2011ISAL0027.
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Ce travail de thèse a consisté à améliorer certaines propriétés de revêtements fonctionnels à base de polychlorure de vinyle (PVC) plastifié et de polyamide-imide (PAI) par incorporation de nanocharges inorganiques préformées, lamellaires ou divisées. La compatibilisation des nanocharges avec la matrice dans laquelle elles ont été incorporées s’est avérée indispensable pour obtenir des films nanocomposites avec une distribution homogène et un état de dispersion le plus fin possible. Différentes stratégies de compatibilisation ont été étudiées, comme la physisorption, la chimisorption, l’intercalation ou encore la chélation d’agents compatibilisants judicieusement choisis et adaptés à chacun des systèmes. Les nouvelles nanocharges ainsi modifiées ont été caractérisées en vue de leur introduction dans la matrice. Les films nanocomposites « compatibilisés » ont été élaborés en voie solvant et/ou par polymérisation in-situ, suivie d’une gélification physique pour le PVC ou d’une réticulation chimique pour le PAI. La caractérisation morphologique des films, réalisée par DRX et MEB/MET, ainsi que les propriétés thermiques et thermomécaniques des films, évaluées par ATG, DSC et DMA, mettent en évidence l’importance de deux paramètres : la chimie de surface des nanocharges, à l’origine des interactions interfaciales nanocharge/polymère, et le procédé d’élaboration du nanocompositeThis study aims at improving some properties of functional PVC- and PAI- based coatings by adding preformed inorganic lamellar or spherical nanofillers. The compatibilization of nanofiller with the polymer matrix in which they are introduced, is required in order to obtain nanocomposite films with an homogeneous distribution and a dispersion state as fine as possible. Different compatibilization strategies, well-suited for each system, have been studied: compatibilizer physisorption, chemisorption, intercalation or chelation. The new modified nanofillers have been characterized before their introduction into the matrix. Various strategies have been considered to obtain the “compatibilized” nanocomposite films such as the solution mixing and/or the in-situ polymerization, followed by a physical gelation or curing step for PVC- or PAI-based nanocomposites, respectively. The morphological characterization of the films, through XRD and SEM/TEM analysis, and the thermal and thermomecanical properties, evaluated by TGA, DSC and DMA, underlined the importance of two parameters: the nanofiller surface chemistry, responsible for the nanofiller/polymer interfacial interactions, and the elaboration process of the nanocomposite
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Linn, Christian [Verfasser], and Ulrich [Akademischer Betreuer] Uwer. "Measurement of the CP-violating phase phis using Bs->J/Psi Phi and Bs->J/Psi pi+pi- decays with the LHCb experiment / Christian Linn ; Betreuer: Ulrich Uwer." Heidelberg : Universitätsbibliothek Heidelberg, 2013. http://d-nb.info/1177248808/34.
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Poma, Deza Jorge Edinson. "Reingeniería de procesos de una planta de PVC para la producción automatizada de cloruro de polivinilo clorado mediante metodología PMI." Bachelor's thesis, Universidad Nacional Mayor de San Marcos, 2012. https://hdl.handle.net/20.500.12672/15665.
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Publicación a texto completo no autorizada por el autorDe acuerdo con la evolución del precio de los metales de uso doméstico, como el cobre, es preciso buscar nuevas alternativas económicas como el PVC, que se viene sintetizando desde 1928 en Estados Unidos; sin embargo, la empresa mexicana Lubrizol pudo “clorar” al PVC para obtener Cloruro de Polivinilo Clorado (CPVC) en 1969, difundiéndola en todo el mundo y en el Perú empresas como Pavco, Tuboplast, Nikol, Politubo y Plastimar lideran el mercado y utilizando tecnología de punta vienen eliminando a la competencia. Se propone realizar la reingeniería a una planta de Producción de PVC, de una empresa peruana, a fin de obtener CPVC de manera automatizada, para lo cual se realiza lo siguiente: análisis y cálculos de la química de las reacciones, propuesta de sistema automatizado, simulación de la nueva planta e implementación mediante metodología Project Managment Institute. Finalmente se espera lograr la implementación adecuada de la nueva planta, lo cual devendrá en una mejora sustancial para la empresa volviéndola competitiva, lo que le permitirá aumentar su participación en el mercado.
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Rodrigues, Isadora Reis. "Síntese e caracterização de redes poliméricas a base de quitosana com PVP e PVA para aplicação na liberação controlada de fármacos." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2006. http://hdl.handle.net/10183/8349.
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Neste trabalho foram desenvolvidos hidrogéis na forma de membranas a base de quitosana (QUI) com polivinilpirrolidona (PVP) ou poli (álcool vinílico) (PVA), usando como agente de reticulação glutaraldeído, para obtenção de redes poliméricas semiinterpenetrantes e redes poliméricas híbridas, respectivamente. Os hidrogéis foram sintetizados em diferentes razões de PVP/QUI e PVA/QUI (%p/p) com duas concentrações distintas de glutaraldeído, visando estudar a influência da composição química nas propriedades dos materiais. Os hidrogéis foram caracterizados através das técnicas de FTIR, DSC, TGA e DMA. O grau de inchamento, ou capacidade de absorção de água dos hidrogéis foi avaliada em testes de inchamento com soluções aquosas de pH 3, 7 e 9. Os hidrogéis foram avaliados por espectroscopia de impedância eletroquímica para avaliar a sua condutividade iônica. A capacidade de armazenamento de amoxicilina pelos hidrogéis e a liberação controlada desta, foi avaliada por espectrofotometria UV e por transporte passivo em uma célula de difusão. O grau de inchamento e o transporte de amoxicilina dos hidrogéis de PVP/QUI e PVA/QUI dependem da composição destes e também do pH do meio. A determinação da condutividade iônica das membranas PVP/QUI e PVA/QUI mostrou-se depende da composição dos hidrogéis. Resultados promissores foram obtidos quanto a condutividade iônica dos hidrogéis e a liberação controlada de amoxicilina.In this work hydrogels based on chitosan with polyvinylpirrolidone (PVP) or poly (vinyl alcohol) (PVA) were obtained, using glutaraldehyde as a crosslinking agent in order to produce semi-interpenetrating polymer networks or hybrid polymer networks. The hydrogels were synthesized using different PVP/chitosan and PVA/chitosan ratios and different glutaraldehyde concentrations aiming to observe the influence of chemical composition on the hydrogels properties. The hydrogels were characterized by FTIR spectroscopy, DSC, TGA, DMA, swelling ratio and impedance spectroscopy. Furthermore, the incorporation of amoxicillin into the hydrogels was carried out and for drug release studies under different pH conditions were realized. It was observed that the hidrogel swelling ratio and amoxicillin delivery of PVP/chitosan and PVA/chitosan hydrogels were influenced by the composition and pH. The impedance studies revealed that the ionic conductivity of membranes is influenced by their composition.
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Gutkovas, Ramunas. "Exercising Psi-calculi : A Psi-calculi workbench." Thesis, Uppsala universitet, Institutionen för informationsteknologi, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-157883.
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This thesis presents an automated tool for manipulation and analysis of mobile concurrent systems described in the Psi-calculi framework. Psi-calculi is a family of process calculi, parameterised on data, conditions and a logic. We provide a general framework for implementing instantiations of these parameters, yielding a Psi-calculus. The tool implements simulation of Psi-calculus processes based on symbolic operational semantics, process constants for providing an environment for processes, and a symbolic bisimulation algorithm for checking bisimilarity. The tool has a command interpreter frontend for interactive use.
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Hinarejos, Campos M. Francisca. "Seguridad en redes de computación ubicua: contribución a la validación de credenciales." Doctoral thesis, Universitat Politècnica de Catalunya, 2010. http://hdl.handle.net/10803/77916.
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Technology progress in both user devices and networks allows communications anytime and anywhere. New communication environments offer a wide range of possibilities to users, but also
generate new threats. For this reason, it is necessary to establish measures to find out who is establishing a communication and what actions is authorized to do. Currently proposed solutions in the literature are not completely adapted to the new features such as user mobility, network disconnections and constraints of devices and networks. Many of the existing proposals have focused in providing specific solutions to particular scenarios, but they do not consider a global heterogeneous scenario. Therefore, it is necessary to design security mechanisms able to adapt themselves to new scenarios. In this sense, digital certificates are a standardized and widely used solution. Digital certificates enable performing user authentication and authorization in a distributed way. The problem is that ubiquitous environments complicate the process of digital certificates validation. This complexity could result in a service being not accessible.
The goal of this thesis is to contribute in making ubiquitous scenarios more secure. More specifically, the work proposes solutions for reducing the credential validation cost and for improving the availability of authentication and authorization services. In first place, we propose a solution for credential validation that works properly in environments with connection to on-line servers and also in environments where the connection to servers is sometimes not possible. In second place, we propose a cascade revocation system where the delegation is partially centralized. Delegation provides high flexibility to authorization systems, but adds complexity to the system. Our proposal reduces the burden on the verifier-side. In third place, we propose a revocation system for delegation chains based on prefix codes. This proposal deals with the problem of centralization of the previous proposal. In particular, the decentralized solution presented keeps the load reduction achieved in the partially centralized proposal, and also enables dynamic delegation and distribution of revocation data. While the user is connected, revocation data distribution can be done with a certificate revocation list. However, in scenarios where the connection can be lost temporally, this might not be possible. To address this issue, we have proposed a system in which users can perform the functions of revocation servers without being trusted entities. This will allow increasing the availability of validation service, and reduce resource consumption. Each proposal has been analyzed and compared with existing solutions to verify the improvements achieved.El avance tecnológico tanto de los dispositivos de usuario como de las redes permite que se puedan establecer comunicaciones en cualquier momento y en cualquier lugar. Si bien estos entornos ofrecen un gran abanico de posibilidades a los usuarios, también es cierto que generan nuevas amenazas. Por este motivo, son necesarias medidas que permitan saber con quién se está estableciendo la comunicación y qué acciones se pueden autorizar. Las soluciones propuestas en la literatura no se adaptan completamente a las nuevas características de movilidad, desconexión y limitaciones tanto de los dispositivos como de las redes. De hecho, muchas de las propuestas existentes se han centrado en ofrecer soluciones concretas a escenarios particulares, sin tener en cuenta que el usuario puede entrar a formar parte de entornos heterogéneos. Por lo tanto, se hace necesario diseñar mecanismos de seguridad que conviviendo con los estándares vigentes, se adapten a los nuevos escenarios. En este sentido, los certificados digitales son una solución estandarizada y ampliamente extendida. Los certificados digitales permiten llevar a cabo tanto la autenticación como la autorización de un usuario de forma distribuida. Sin embargo, las características de los entornos ubicuos complican el proceso de validación de certificados. Esta complejidad podría llevar a que no se puediera acceder a los servicios. El objetivo de esta tesis es contribuir a aumentar la seguridad en entornos ubicuos. Más concretamente, se proporcionan soluciones para reducir la carga en la validación de credenciales y aumentar la disponibilidad de los servicios de autenticación y autorización. En primer lugar se propone un sistema de verificación de credenciales que se adapta para funcionar tanto en entornos con conexión a servidores on-line, como en sistemas off-line. Por otra parte, el proceso de delegación en sistemas de autorización, aporta una gran flexibilidad a estos entornos, pero a su vez añade complejidad al sistema. Para reducir esta carga sobre el verificador se propone un sistema de revocación en cascada con delegación centralizada. Sin embargo, esta centralización del servicio limita la escalabilidad y flexibilidad de la solución. Para dar solución a ese inconveniente, se ha propuesto un sistema de revocación en cadenas de delegación basado en códigos prefijo. Esta solución permite mantener la reducción de la carga en la validación lograda en la propuesta centralizada, y además, hace posible la delegación dinámica y la distribución de la información de revocación. Esta distribución puede realizarse a través de listas de revocación de credenciales. En redes con desconexión temporal esta información podría no estar accesible. Para solventarlo, se ha propuesto un sistema en el que los usuarios pueden realizar las funciones de servidores de revocación sin ser entidades de confianza. De esta forma se permite aumentar la disponibilidad del servicio de validación, y reducir el consumo de los recursos. Cada una de las propuestas realizadas se ha analizado para verificar las mejoras proporcionadas frente a las soluciones existentes. Para ello, se han evaluado de forma analítica, por simulación y/o implementación en función de cada caso. Los resultados del análisis verifican el funcionamiento esperado y muestran las mejoras de las propuestas frente a las soluciones existentes.
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Langenbruch, Christoph [Verfasser], and Ulrich [Akademischer Betreuer] Uwer. "Measurement of the Bs mixing phase in the decay Bs -> J/psi phi with the LHCb experiment / Christoph Langenbruch ; Betreuer: Ulrich Uwer." Heidelberg : Universitätsbibliothek Heidelberg, 2011. http://d-nb.info/1179782607/34.
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Coronel, Castro Marianella, Gutiérrez Claudia Alexandra Echevarría, Montero Manuel Daniel López, Arévalo Alejandro Alonso Rodríguez, and Cotrina Alexander Sifuentes. "PSI-SOS." Bachelor's thesis, Universidad Peruana de Ciencias Aplicadas (UPC), 2021. http://hdl.handle.net/10757/655499.
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El objetivo del presente plan de negocios es la creación de la empresa PSI-SOS, la cual brinda un servicio de atención online a personas con problemas de salud mental a través de su plataforma web, para lo cual cuenta con un directorio de psicólogos, a quienes se contacta y contrata para brindar un servicio especializado a nuestros usuarios registrados.
La empresa está enfocada en la atención a los casos referidos a problemas de salud mental que se vienen dando en la población, sobre todo ahora, en una etapa crucial para la humanidad, como lo es la pandemia del Covid-19, la cual marca un precedente en el comportamientos de los seres humanos.
En PSI-SOS afirmamos que la terapia online es la forma más accesible para una sesión con el psicólogo, por lo cual estructuramos una plataforma interactiva para informar fácilmente a nuestros usuarios potenciales, así como atender a nuestros clientes.
Por eso nuestros servicios están distribuidos en paquetes de sesiones para los diversos tipos de necesidades y tratamiento que pueden elegir las personas, asimismo está focalizado en realizar promociones y seguimiento de nuestros clientes para lograr su fidelización a nuestros servicios, lo que también puede ser uno de los factores que aporten un incremento de nuestras ventas.
Finalmente, después de un exhaustivo análisis financiero, hemos reconocido un costo de oportunidad del capital (COK) del 9.99% y un costo promedio ponderado (WACC) de 10.96%, cifras claves que validan nuestro plan de negocios confirmando la viabilidad económica de la empresa.The aim of this business plan is the development of the company PSI-SOS, which provides an online care service to people with mental health problems through its web platform, for which it has a directory of psychologists, at who is contacted and contracted to provide a specialized service to our registered users. The company is focused on attending to cases referring to mental health problems that are occurring in the population, especially now, at a crucial stage for humanity, such as the Covid-19 pandemic, which marks a precedent in the behavior of human beings. At PSI-SOS we affirm that online therapy is the most accessible way for a session with the psychologist, which is why we have structured an interactive platform to easily inform our potential users, as well as serve our clients. That is why our services are distributed in session packages for the various types of needs and treatment that people can choose, it is also focused on promoting and monitoring our clients to achieve their loyalty to our services, which can also be one of the factors that contribute to an increase in our sales. Finally, after an exhaustive financial analysis, we have recognized an opportunity cost of capital (COK) of 9.99% and a weighted average cost (WACC) of 10.96%, key figures that validate our business plan confirming the economic viability of the company.
Trabajo de investigación
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Velazquez, Alberto. "Microstructure and thermal stability of PVC and chemically modified PVC." Thesis, McGill University, 1989. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=74243.
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This thesis describes a study of the effect of microstructure on the thermal stability of poly(vinyl chloride), PVC, vinyl chloride-ethylene, VC-E, and vinyl chloride-propylene, VC-P, copolymers obtained by chemical modification of PVC. The VC-E copolymers, with an ethylene content between 1.1 and 21 mole %, are random copolymers with approximately the same degree of polymerization as the original PVC. A decrease in the number of defect sites is observed with extent of reaction. Concomitantly, the syndiotacticity increases. The VC-P copolymers, with propylene content of ca. 0.1%, also have less labile chlorines than the homopolymer since these react preferentially.The thermal stability of solid state samples was studied, at temperatures between 150 and 190$ sp circ$C under a nitrogen atmosphere, using a conductimetric method to measure evolved HCl. The thermal stability of the modified samples is improved relative to that of the initial homopolymers. For the VC-E copolymers, a linear relationship is observed between the rates of degradation and the number of labile chlorines, total double bonds and the degree of syndiotacticity. The role of syndiotacticity on the thermal degradation behavior is confirmed in results obtained with two unmodified PVC samples, with a similar number of defect sites but different syndiotacticity. The more syndiotactic resin shows a higher thermal stability. The average polyene sequence length is independent of the ethylene concentration. Thus, the ethylene units do not interfere in the development of polyene sequences.
The VC-P copolymers also show improved thermal stability as compared to that of PVC. However, the improvement is less than that of the VC-E copolymers, due to a lower extent of substitution of labile sites.
PVC previously saturated with HCl shows a markedly increased rate of degradation reflecting the autocatalytic role of HCl. For the PVC coated samples, a decrease in the degradation rates with decreasing PVC film thickness is observed due to more efficient removal of HCl. The PVC mixtures with Chromosorb W or silica gel exhibit a decrease in the dehydrochlorination rate constants with decreasing PVC content. The inert substrate acts as a diluent and avoids agglomeration of the samples and thus facilitates the removal of HCl.
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Silva, Fábio Eduardo da. "Psi: é possível treinar? revisando a literatura sobre desenvolvimento psi." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/47/47134/tde-09082013-122528/.
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Estuda as experiências anômalas (EAs), as quais podem ser definidas como incomuns e irregulares, ainda que vivenciadas por uma grande parcela da população. Dentre a variedade de EAs, concentra-se nas experiências relacionadas a psi, que incluem duas categorias. A primeira abrange relatos de percepção extra-sensorial (ESP), ou seja, indicativos da capacidade de se obter informação sem a utilização dos canais sensoriais ou de inferências lógicas. A segunda é chamada de Psicocinesia (PK) e refere-se a relatos da ação ou efeito da mente sobre a matéria, ou seja, quando as preferências ou pensamentos de pessoas parecem afetar o ambiente físico, sem a mediação do sistema muscular ou outra força física ou mecanismo físico reconhecido. Investiga se: a) é possível treinar pessoas para estarem mais aptas para perceber e utilizar os fenômenos psi no contexto experimental e b) se a manipulação de certos fatores pode aumentar significativamente os índices de psi em laboratório. Para tanto, revisa e discute por meio de sistematização a eficácia das pesquisas de treinamentos psi (TP) e os resultados de estudos que manipulam variáveis consideradas psicondutivas (VCP). Agrupa os estudos nestas duas categorias (TP e VCP), considerando variáveis específicas e comuns para os dois grupos. Avalia os estudos em blocos, segundo as variáveis consideradas, com ênfase nos dados estatísticos e do método. A revisão da literatura ocorre de março de 2007 a fevereiro de 2008 e abrange livros e artigos científicos relacionados ao tema. 128 estudos são revisados, sendo 87 deles relacionados a manipulação de VCP e 41 relacionados ao TP, totalizando 9.153 participantes em 845.815 ensaios. Avalia que 37% dos estudos TP são criticados, sendo a maior parte das críticas endereçada a problemas de método, enquanto que 16% dos estudos VCP recebem críticas. Conclui que os estudos não são eficazes em treinar psi ou manipular variáveis psi-condutivas, ainda que a maior parte deles obtenha resultados significativos e na direção esperada. De uma forma geral eles falham em termos da elaboração de métodos capazes de excluir hipóteses alternativas àquelas testadas, sendo que as principais falhas são: 1. falta de grupos controle; 2. controle inadequado da variável crença, tanto em relação aos sujeitos como aos pesquisadores; 3. falha em avaliar o real aprendizado; a maioria dos estudos são de curta ou curtíssima duração e sem a avaliação e/ou correlação dos fatores, aos quais se atribui aprendizado, com os escores psi. Com exceção de um estudo, os demais não apresentam testes posteriores para verificar a possível manutenção dos níveis de psi alcançados; 4. o efeito experimentador psi e psicológico é amplamente ignorado pela maioria dos estudos; 5. falta de parâmetros padrões para avaliar determinadas características ou estados (ex. hipnose, meditação, ganzfeld); 6. falta de uma abordagem sistêmica e integrada em relação aos fenômenos psi, aos métodos para testá-los e as múltiplas variáveis passíveis de influenciá-lo. Considera estas falhas apresentando sugestões para superá-las e uma proposta inicial exploratória de treinamento psiThis dissertation is about studies of anomalous experiences (AEs), which can be defined as uncommon and irregular, but reported by a large segment of the population. Among the variety of AEs, this work concentrates on psi-related experiences, which includes two categories. The first are reports of extrasensory perception (ESP), which suggest the capacity of obtaining information without the use of the sensory channels or logical inference. The second is called of psychokinesis (PK), which refers to reports of the action or effect of the mind on matter, or when people\'s thoughts seem to affect the physical environment, without the mediation of the muscular system, a physical force, or a recognized physical mechanism. The study explores if: a) it is possible to train people to be more capable to perceive and use psi phenomena in the experimental context and, b) if the manipulation of some factors can increase psi scores significantly in the laboratory. A review of the research on the effectiveness of psi trainings (PT) and of studies that manipulate psi-conductive variables (PCV) is presented. The studies are grouped in these two categories (PT and PCV), considering specific and common variables for both groups. Studies are evaluated in subgroups, according to specific variables, with emphasis on statistics and methods. The literature review was conducted from March 2007 to February 2008, and it includes books and scientific papers on the topic. 128 studies are reviewed; 87 of them about the manipulation of VCP and 41 of TP, for a total of 9.153 participants in 845.815 trials. 37% of the TP studies are criticized, mostly on methodological grounds, while the same was the case for 16% of the VCP studies. Although most of the studies obtained significant results in the expected direction, it is concluded that they are not effective to train psi or to manipulate psiconductive variables. In general they fail in terms of the elaboration of methods capable to exclude alternative hypotheses, and the main flaws are: 1. lack of control groups; 2. inappropriate control of the variable of belief, for both the subjects and researchers; 3. lack of evaluation of learning; most of the studies were of brief duration and without the evaluation and/or correlation of the factors to which learning is attributed, and in relation to psi scores. With the exception of one study, the rest do not present subsequent analyses to verify the possible maintenance of the psi levels obtained; 4. the experimenter effect (psi and psychological) is ignored completely in most of the studies; 5. lack of standard parameters to evaluate certain characteristics or states (for example hypnosis, meditation, ganzfeld); 6. lack of a systemic and integrated approach in relation to psi phenomena, to the methods used to test them, and to multiple variables that may influence them. In addition to discussing these problems, suggestions are presented to improve the situation, together with an exploratory initial proposal for psi training
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Heller, Claudio. "Measurement of the CP violating phase phiS and the decay width difference DeltaGammaS in the decay B0s->J/psi phi with the ATLAS experiment." Diss., Ludwig-Maximilians-Universität München, 2013. http://nbn-resolving.de/urn:nbn:de:bvb:19-159942.
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Åman, Pohjola Johannes. "Verifying Psi-calculi." Thesis, Uppsala universitet, Institutionen för informationsteknologi, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-132192.
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Psi-calculi are mobile process calculi, parametrised with arbitrary nominal datatypes representing data, communication channels, assertions and conditions, as well as morphisms over those datatypes. The framework for psi-calculi has been formalised in the interactive theorem prover Isabelle, along with both strong and weak bisimulation. This master's thesis project presents a tool for formally verifying that psi-calculus candidates are well-defined within the Isabelle/HOL-Nominal framework. It employs custom-made, heuristic proof tactics that discharge as many proof obligations as possible automatically, and passes any remaining proof obligations back to the user, who must supply manual proofs. The implementation of the tool as well as the proof strategies employed are described. The tool is applied to verify encodings of both the monadic and polyadic variants of the pi-calculus, as well as the pi-F calculus.
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Karlsson, Julia, and Moa Sjöström. "Forecasts of PMI." Thesis, Umeå universitet, Institutionen för matematik och matematisk statistik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-172416.
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Purchasing Mangers' Index (PMI) is an index published by the Institute for Supply Management. The index is based on a monthly survey answered by hundreds of purchasing managers in the manufacturing business all over the United States. The questions capture the activities of companies when it comes to orders, production, employment, supplier deliveries and inventories. PMI is an important and reliable macro economic factor and has shown a high correlation with the GDP which means that it may be of interest for a bank as Nordea to predict it. The purpose of this thesis is to evaluate whether it is possible to use neural networks, more precisely sequence-to-sequence models and recurrent neural networks, to forecast PMI with a multivariate data set. Simpler methods and models are also evaluated and compared to the neural networks. In total, there was two naive models, one Autoregressive Moving Average (ARMA) model, two linear regression models, and three neural network models that was implemented and compared to each other. All models were evaluated by their mean squared error (MSE) and mean absolute error (MAE). By analyzing MSE and MAE for the different models it is shown that the ARMA-model predicted only slightly better than the persistence algorithm which assumes that PMI next month equals PMI current month. Only one neural network model performed better compared to the linear regression models, and the same model also gave a better prediction compared to the persistence algorithm.
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Lindberg, My, and Frida Lindstrii. "PVK IN SITU." Thesis, Malmö högskola, Fakulteten för hälsa och samhälle (HS), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:mau:diva-26113.
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Lindberg M & Lindstrii F. PVK in situ. En observationsstudie av följsamhet tillriktlinjer gällande skötsel, dokumentation vid fixeringsförband,komplikationssymptom samt tid in situ. Examensarbete i omvårdnad 15högskolepoäng. Malmö högskola: Fakulteten för hälsa och samhälle, institutionenför vårdvetenskap, 2014.Bakgrund: perifer ven kateter (PVK) är ett mycket vanligt ingrepp inomsjukvården som medför risker för kateterrelaterade komplikationer. I Sverige ärdet främst sjuksköterskans uppgift att hantera vården kring PVK. Vårdhandbokenhar som uppgift att säkerhetsställa en god säker vård genom att publiceralättillgängliga riktlinjer för olika moment inom sjukvården. Genom att följavårdhandbokens riktlinjer avseende PVK kan riskerna för komplikationer minska.Syfte: beskriva följsamhet till vårdhandbokens riktlinjer gällande skötsel av PVK,dokumentation vid fixeringsförband, byte vid komplikationssymptom samt attbeskriva tid in situ av PVK på vårdavdelningar.Metod: en observationsstudie genomfördes på ett större och ett mindre sjukhusi södra Sverige. Datainsamling gjordes under två veckors tid med hjälp av ettvaliderat och reabilitetstestat instrument, PVC – Assess, och ett eget framtagetprotokoll av författarna. Totalt insamlades 64 PVK observationer.Resultat: följsamheten till vårdhandbokens riktlinjer var inte tillfredsställande vidmajoriteten av variablerna i PVC-Assess, dokumentation vid fixeringsförbandetoch tid in situ.Slutsats: studien har metodologiska brister som medför att resultatets trovärdighetblir låg. Dock antyder resultatet på att det finns brister i följsamheter kringriktlinjer avseende PVK.Lindberg M & Lindstrii F. PVC in situ. An observational study of adherence towards guidelines regarding the management, documentation at fixationdressings, symptoms of complications and the time in situ. Degree project in nursing 15 credit points. Malmö University: Faculty of health and society, Department of care science, 2014.Background: peripheral vein catheter (PVC) is a very common procedure in healthcare that involves risks for catheter-related complications. In Sweden, the management and care of PVC is primary performed by nurses. The handbook for healthcare’s task is to provide a good and safe care by publishing accessible guidelines on various topics in healthcare. By following the handbook for healthcare’s guidelines regarding PVC the risks for complications can be reduced. Aim: describe adherence to the handbook for healthcare’s guidelines regarding the management of PVC, documentation at fixation-dressings, changing by complication-symptoms and to describe time in situ of PVC in wards.Method: an observational study was conducted on a larger and a smaller hospital in southern Sweden. Data collection was done in two weeks’ time with the help of a validated and reliability-tested instrument, PVC - Assess, and a protocol developed by the authors. Total of 64 PVC were observed.Results: adherence to the handbook for healthcare’s guidelines were not being guaranteed by the majority of the variables in PVC-Assess, documentation at fixation dressing and the time in situ.Conclusion: the study has methodological shortcomings that lowers the results credibility. However, the results suggests that there is still a lack of compliance regarding PVC-guidelines.
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De, Marco Lisa. "Rilievo virtuale ad alto rendimento di pavimentazioni stradali: studio sperimentale per la valutazione di un indicatore sintetico di stato." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2010. http://amslaurea.unibo.it/948/.
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Leopold, Teresa Ingeborg, and n/a. "The construction of a disaster destination : rebuilding Koh Phi Phi, Thailand." University of Otago. Department of Tourism, 2008. http://adt.otago.ac.nz./public/adt-NZDU20080430.100246.
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The popular tourist destination island of Koh Phi Phi Don, Thailand was heavily affected by the Indian Ocean Tsunami in December 2004, which resulted in a destroyed tourism infrastructure and complete downturn of tourism. Extensive recovery and rebuilding work by emerging community groups, returned locals, international volunteers and Thai government units provided an efficient but hasty reconstruction of the destination. Ethnographic research conducted in the community provided insights into the complex stakeholder interactions and their roles and influences on the reconstruction of the community.
The community�s level of vulnerability on Koh Phi Phi Don was influenced by social processes and interactions during the destination�s recovery process as the various stakeholders (e.g. government vs. locals) had differing perceptions of the island�s economic, environmental and social vulnerability. These disputes are grounded in different social time processes, particularly illustrated through land law disputes among locals, landowners and the government. Other factors which influenced the reconstruction of Koh Phi Phi as a tourist destination were pre-tsunami conditions (past overdevelopment), the empowerment of the community, the reconstructed place identity, various anniversary celebrations and the early warning system.
A model is suggested to illustrate and discuss Koh Phi Phi Don as a disaster destination, which provides insights into the dynamics which govern a destination�s post-disaster recovery period. Thus, it illustrates how stakeholder interaction is influenced by distinct understandings of the multiple notions of vulnerability. Furthermore, this study establishes essential links between disaster and tourism theories and suggests an extended tourism disaster management framework, which calls for an inclusion of post-recovery processes.
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Searle, J. R. "Titanium dioxide pigment photocatalysed degradation of PVC and plasticised PVC coatings." Thesis, Swansea University, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.638788.
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Due to its ubiquitous presence in paints of all colours, titanium dioxide represents the primary pigment used in Organically Coated Steel (OCS) for construction applications. However the semi-conducting nature of TiO2 translates into a possibility of inducing photodegradation when exposed to Ultra Violet (UV) radiation such as that present in sunlight. Initial research concentrated on developing a test procedure of the photoactivity of these pigments within a PVC binder. Model coatings, using pigments of known performance, have been tested to evaluate the success of this rapid test technique and excellent correlation has been shown. Building on this, Chapter 4 details a unique cell that has been designed, constructed and tested resulting in a more versatile testing environment. This cell has been used to examine the photostability of 4 commercially available pigments while present within a standard emulsion paint binder. Chapters 5 and 6 detail work performed on Plasticised PVC paint films and the resultant effects this has on the kinetics of photodegradation as monitored via the evolution of CO2. Also incorporated into this design is the ability to identify and quantify volatile organic components that are evolved during the degradation process, thus providing information regarding the photodegradation mechanism occurring within the film. It has been found that in these model films, the addition of plasticiser increases the rate of photogenerated CO2 and also produces volatile components that can be directly related to the parent plasticiser molecule. There is some evidence to suggest that for certain plasticisers, a sacrificial protection mechanism is at work, resulting in increased CO2 evolution but decreased attack on the binder matrix. Finally in Chapter 7, a number of complimentary techniques are employed to assess the effect that TiO2 photocatalysed PVC degradation has on the underlying substrate material. The techniques include electrochemical impedance spectroscopy (EIS), electro-generated chemiluminescence (ECL) and 3-D scanning vibrating electrode technique (3-D SVET). Photodegradation leads to porosity development in coatings and eventual through coating penetrative defects lead to corrosion.
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Walker, Ryan Christopher Gareth. "Poi Poi Revolution: A real-time feedback training system for objectmanipulation." Thesis, University of Canterbury. Human Interface Technology Laboratory, 2013. http://hdl.handle.net/10092/8039.
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The affordability and availability of fast motion cameras presents an
ideal opportunity to build computer systems that create real-time feed-
back loops. These systems can enable users to learn at a faster rate than
traditional systems, as well as present a more engaging experience. In
this dissertation, I document the development and evaluation of a real-
time audio and visual feedback system for geometric poi manipulation.
The goal of the system is to present an experiential and objectively su-
perior learning tool when compared to traditional learning techniques in
the object manipulation community. For the evaluation, I conduct an
experiment that compares the feedback training system with traditional
learning techniques in the object manipulation community. The results
suggest that the feedback system presents a more engaging experience
than traditional mirror feedback training, and conclude that further re-
search is warranted.
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Cherer, Evandro de Quadros. "A noção de pai em psicanálise do declínio ao pai morto." reponame:Repositório Institucional da UnB, 2018. http://repositorio.unb.br/handle/10482/34156.
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Tese (doutorado)—Universidade de Brasília, Instituto de Psicologia, Programa de Pós-graduação em Psicologia Clínica e Cultura, 2018.Às voltas com as mudanças familiares na sociedade vienense, no final do século XIX, e com a sexualidade histérica, Sigmund Freud atentou-se para a questão do pai, inserindo-a no campo da psicanálise. A propósito disso, o presente estudo consiste em uma proposta de investigação teórica sobre a questão do pai à luz da psicanálise, tendo como objetivo investigar a noção de pai, redimensionando-a no campo da psicanálise. Particularmente, buscou-se que os operadores conceituais da psicanálise fossem reconsiderados, fundamentalmente no que diz respeito à questão do pai em relação ao declínio da imago paterna e suas eventuais repercussões na constituição subjetiva. Acerca disso, percorreu-se como a noção de pai surgiu, desenvolveu-se e foi trabalhada na obra freudiana. De início, o pai foi apreendido enquanto sedutor e associado à etiologia das neuroses. Entretanto, a teoria da sexualidade infantil promoveu uma torção, deslocando o pai para o complexo de Édipo. Nesse, o pai seria o interditor do objeto de desejo e, simultaneamente, o ideal, na medida em que detém para si a mãe ao possuir o falo. Essa relação ambivalente, ou seja, de rivalidade e idealização, foi nomeada de complexo paterno, aspecto fundamental na noção de pai. Situando essa questão nas origens da humanidade, Freud formulou o mito do parricídio inaugural. O Urvater, o pai primordial, foi assassinado pelos filhos e, mesmo morto, tornou-se mais forte que se vivo estivesse. Semelhantemente, Moisés teria sido assassinado pelos judeus ao conduzi-los à terra prometida. Nas três principais versões freudianas do pai (Édipo, Urvater e Moisés), o parricídio está presente. O pai, o Um da exceção, é, a rigor, o pai morto, aquele cujo lugar ninguém está efetivamente à altura. De modo semelhante, investigou-se o declínio do pai e a problemática de suas eventuais repercussões na obra do jovem Lacan, na qual repercussões foram tributadas ao declínio da família paternalista, bem como eventuais falhas na constituição subjetiva atribuídas ao pai no seio familiar. Foi visto que essa lógica da contração familiar como prejudicial à constituição subjetiva está presente mesmo atualmente. Contrapondo-se a essa perspectiva, a problemática do pai também foi considerada em o “retorno a Freud” feito por Lacan, período no qual a noção de pai passou a ser apreendida a partir do caráter linguajeiro, sendo cunhado o conceito de Nome-do-Pai enquanto suporte da função simbólica. Distanciando-se do familialismo, é numa função lógica que o pai foi situado. Com isso, esta tese procurou investigar o que é o pai em psicanálise, essencialmente na teoria freudiana e nas (re)leituras produzidas por Lacan, contrapondo-se ao uso que se faz atualmente das noções de “enfraquecimento” ou “declínio” da função paterna, redimensionando essas questões no campo da psicanálise e defendendo a hipótese segunda a qual há uma radical distinção entre os pais, que estão sempre aquém, e a função paterna enquanto tal.
In view of family changes in Viennese society at the end of the nineteenth century, and with hysterical sexuality, Sigmund Freud occupied himself at the question of the father, inserting it into the field of psychoanalysis. In this regard, the present study consists of a theoretical research on the question of the father in the light of psychoanalysis, aiming to investigate the notion of father, redimensioning it in the field of psychoanalysis. Particularly, it has tried to reconsider the conceptual operators of psychoanalysis, fundamentally what it comes to the question of the father in relation to the decline of paternal imago and its possible repercussions on subjective constitution. Regarding this, it was studied how the idea of father arose, developed and was worked out in Freudian literature. At first, the father was apprehended as seductive and associated with the etiology of the neuroses. However, childhood sexuality promoted a twist, shifting the father to the Oedipus complex, in which the father would be the interdictor of the object of desire and, simultaneously, the ideal, considering that he holds for himself the mother as he possesses the phallus. This ambivalent relation, that is, of rivalry and idealization, was named paternal complex, fundamental aspect in the notion of father. Contextualizing this question in the origins of humanity, Freud formulated the myth of the inaugural parricide. Urvater, the primordial father, was murdered by his sons and, even dead, became stronger than if he were alive. Similarly, Moses have been murdered by the Jews when leading them to the promised land. In the three major Freudian versions of father (Oedipus, Urvater, and Moses), parricide is present. The father, the One of the exception, is, strictly speaking, the dead father, the one whose place no one is effectively up to. In a similar way, the present study also investigated father's decline and the problematic of its eventual repercussions in the work of young Lacan, in which repercussions were tributed to the decline of the paternalistic family, as well as possible failures in the subjective constitution attributed to the father within the family. It has been seen that this logic of family contraction as detrimental to the subjective constitution is present even today. In contrast to this perspective, the father's problematic was also considered in Lacan's "return to Freud", a period in which the notion of father became apprehended by the character of langage, and the concept of the Name-of-Father was coined as support of the symbolic function. Distancing itself from familialism, it was in a logical function that the father was placed. Thus, this thesis sought to investigate what the father is in psychoanalysis, essentially in Freud's theory and in the (re)readings produced by Lacan, in opposition to the current use of notions of "weakening" or "decline" of function paternal, redimensioning these issues in the field of psychoanalysis and defending the hypothesis according which there is a radical distinction between the fathers, who always fall short, and the paternal function.
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Mitby, Amy K. (Amy Kirsten) 1979. "A PCI/PCI-X test card for I/O system verification." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/87243.
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Conner, Gretchen M. "A three part study exploring psi-conduciveness and psi-defensiveness in groups /." View online, 2009. http://repository.eiu.edu/theses/docs/32211131559729.pdf.
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Hitchman, Glenn A. "Testing the psi mediated instrumental response theory using an implicit psi task." Thesis, University of Northampton, 2012. http://nectar.northampton.ac.uk/8859/.
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LUO, HONG. "Resolution en elements finis des equations d'euler en variables [phi-vecteur psi] par une methode de decomposition d'operateurs : applications aux ecoulements de fluides en regime transsonique stationnaire." Paris 6, 1989. http://www.theses.fr/1989PA066325.
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L'etude porte sur la resolution des equations d'euler transsoniques stationnaires en elements finis a l'aide d'une methode de decomposition d'operateurs. Nous presentons un algorithme base sur une technique pseudo-instationnaire et la methode de decomposition d'operateurs permettant de decoupler de facon physique les trois difficultes rencontrees en trois sous-problemes dans la nouvelle formulation des equations d'euler basee sur la decomposition d'helmholtz: la compressibilite, la portance et la partie rotationnelle. Plusieurs resultats sont presentes, discutes et compares avec ceux obtenus par l'approche potentielle et l'approche d'euler en formulation conservative. Les experiences numeriques en dimension deux et trois realisees dans un contexte industriel montre que l'algorithme obtenu permet de resoudre les equations d'euler pour des ecoulements de fluides en regime stationnaire transsonique d'une maniere robuste et rapide
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Vess, Lora Elizabeth. "The politics of PVC /." Connect to title online (Scholars' Bank) Connect to title online (ProQuest), 2007. http://hdl.handle.net/1794/6195.
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Thesis (Ph. D.)--University of Oregon, 2007.Typescript. Includes vita and abstract. Includes bibliographical references (leaves 252-277). Also available online in Scholars' Bank; and in ProQuest, free to University of Oregon users.