Thesis (Ph. D.)--University of Missouri-Columbia, 1998. / Typescript. Vita. Includes bibliographical references (leaves 274-287). Also available on the Internet.

Thesis (Ph. D.)--University of Missouri-Columbia, 1998. / Typescript. Vita. Includes bibliographical references (leaves 274-287). Also available on the Internet.

Thesis (Ph. D.)--University of Oregon, 2005. / Typescript. Includes vita and abstract. Includes bibliographical references (leaves 261-272). Also available for download via the World Wide Web; free to University of Oregon users.

Ce travail explore expérimentalement en géométrie microfluidique, des instabilités sous champ de fluides magnétiques aqueux, aux propriétés bien caractérisées et dont les nanoparticules sont stabilisées électrostatiquement.La micro-convexion magnétique observée à l'interface miscible entre le fluide magnétique et l'eau est étudiée quantitativement dans une cellule de Hele-Shaw sous champ magnétique homogène, en particulier par vélocimétrie par image de particules. Les résultats sont comparés aux prédictions théoriques et à des simulations numériques. Au delà de la caractérisation des champs critiques, il est observé qu'une augmentation du champ H accélère la croissance des doigts, comme H2, tandis que la figure de digitation n'est pas modifiée. Une application au mélange en microfluidique est ici envisagée. L'étude de la micro-convexion a révélé une diffusion effective de coefficient beaucoup plus grand que celui des nanoparticules, tel que prédit par la formule de Stockes-Einstein ou obtenu par des mesures directes. Des explorations expérimentales montrent que cette diffusion effective provient d'un écoulement lié à la différence de densité des deux fluides. La diffusion semble influencée par les agents qui stabilisent les nanoparticules. Des gouttes de liquide magnétique concentré co-existant avec une phase diluée sont obtenues par séparation de phase induite par ajout de sel et/ou application d'un champ magnétique. Leur déformation sous champ permet de suivre l'évolution temporelle de la phase concentrée métastable. Dans un champ magnétique précessant à l'angle magique, les gouttes se comportent comme en champ tournant, sauf en ce qui concerne leur déformation initiale. / Magnetic field induced instabilities of magnetic fluids in microfluidic environment are investigated experimentally. Electrically stabilized water-based magnetic nanocolloids are used and throughout characterized.Magnetic micro-convection, observed at a miscible magnetic fluid-water interface in a Hele-Shaw cell in homogeneous field, is studied quantitatively and compared with theoretical predictions and numerical simulations, micro-convective flows being characterized by particle image velocimetry. Besides the critical field determination, it is shown that an increase of the magnetic field H speeds up the finger growth, which scales as H2, while the size of the fingering pattern is not changed. An application towards mixing enhancement in microfluidics is considered.The micro-convection study reveals a much larger effective diffusion coefficient of the nanoparticles than expected from Stokes - Einstein relation and standard determinations. Investigations with the same setup and with continuous microfluidics show that the effective diffusion mostly arises from a flow induced by the density difference between the miscible fluids. Additionally, the diffusion coefficient seems to be influenced by the particle stabilizing agents.Drops of a concentrated magnetic phase in co-existence with a dilute one are formed by phase separation after salt addition to the magnetic fluid and/or the application of a magnetic field. Their under-field shape deformations allow investigating the time evolution of the concentrated phase. Experiments show that in a precessing field at magic angle, the drops behave as in a rotating field except the initial shape deformation before quick elongation.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-06-06T18:56:53Z No. of bitstreams: 1 LucasAmaralMachado_DISSERT.pdf: 675823 bytes, checksum: cd1bcc94212045a3a4738ef67078d1cf (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-06-07T23:51:14Z (GMT) No. of bitstreams: 1 LucasAmaralMachado_DISSERT.pdf: 675823 bytes, checksum: cd1bcc94212045a3a4738ef67078d1cf (MD5) / Made available in DSpace on 2016-06-07T23:51:14Z (GMT). No. of bitstreams: 1 LucasAmaralMachado_DISSERT.pdf: 675823 bytes, checksum: cd1bcc94212045a3a4738ef67078d1cf (MD5) Previous issue date: 2015-03-11 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico (CNPq) / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / O objetivo deste estudo foi realizar a extra??o ?leo de r?-touro ?leo de r?-touro e desenvolver uma emuls?o adequada para uso t?pico do mesmo. Duas amostras de ?leo fora obtidas por diferentes m?todos, sendo uma por extra??o a quente e outra utilizando solvente org?nico. As amostras foram fisioquimicamente caracterizadas por t?cnicas de titula??o e seus compostos identificados atrav?s de cromatografia gasosa acoplada a espectrometria de massas (GC/EM). O equil?brio hidrif?lico-lipof?lico requerido (EHLr) do ?leo de r?-touro foi determinado e em seguida um diagrama de fases constru?do. A estabilidade da emuls?o de uso t?pico contendo diferentes adjuvantes farmac?uticos foi determinada. A an?lise de citotoxicidade do ?leo de r?-touro in natura e na emuls?o de uso t?pico foi realizada atrav?s do ensaio de MTT, utilizando linhagem de fibroblastos normais (3T3) e de melanoma (B16F10). O rendimento da extra??o a quente foi de 60,6%. Os principais compostos insaturados encontrados foram o ?cido eicosapentaen?ico (17,6%) e ?cido araquid?nico (8,4%). O estudo de EHLr demonstrou a presen?a de sistemas est?veis com EHL entre 12 e 13,5 e o diagrama de fases revelou a predomin?ncia de sistemas caracterizados como emuls?o (62%). A emuls?o t?pica apresentou tamanho de got?cula igual a 390 nm, polidispers?o de 0,05, potencial zeta -25 mV e manteve-se est?vel durante os 90 dias avaliados. O ?leo de r?-touro e a emuls?o t?pica n?o apresentaram citotoxicidade frente ? linhagem de c?lulas 3T3. No entanto, estes sistemas inviabilizaram significativamente (p > 0,05) o crescimento das c?lulas B16F10. Em conclus?o, o ?leo de r?-touro apresenta caracter?sticas qu?micas desej?veis para o desenvolvimento de sistemas terap?uticos de uso farmac?utico e/ou cosm?tico. / The skin is one of the largest organs of the human body and accounts for about 16% of body weight. The body protection against the external environment microorganisms is one of its most important functions, however is necessary that the skin remain intact for this function be exercised, so that when there is an injury on the skin, the process of restructuring needs to be starts, however this restructuration may also be compromised due to some diseases, justifying even more the need for the development of topical products that promote or accelerate the skin healing. Thus the aim of this study was to extract bullfrog oil and to develop a suitable topical emulsion. Two different oil samples were extracted by hot or organic solvent process. Titration techniques and gas chromatography- mass spectrometry were used to characterize the bullfrog oil. The required hydrophile-lipophile balance (HLBr) of bullfrog oil was determined and a pseudo-ternary phase diagram was constructed. The stability of the topical emulsion was evaluated. Then, cellular viability was determined by MTT assay using normal fibroblasts (3T3) and melanoma (B16F10) cells lines. The hot extraction yield was 60.6%. The major polyunsaturated compounds found were Eicosapentaenoic acid (17.6%) and Arachidonic acid (8.4%). HLBr study demonstrated the presence of stable systems with HLB ranging from 12.1 to 13.5 and the pseudo-ternary phase diagram showed mainly emulsion systems (62%). Topical emulsion showed 390 nm, polydispersity 0.05, zeta potential -25 mV and remained stable for ninety days. The bullfrog oil and topical emulsion did not showed citotoxicity in normal fibroblasts cells. However, these systems showed significantly inhibition of melanoma cells growth. In conclusion, the bullfrog oil presented desirable chemical characteristics required to be used for the development of a pharmaceutical and cosmetic products.

Submitted by Daniella Sodre (daniella.sodre@ufpe.br) on 2015-04-08T12:30:41Z No. of bitstreams: 2 DISSERTAÇÃO Francisco Melo da Rocha.pdf: 12498941 bytes, checksum: 5e6a701cfa71e166499f525dd85c775d (MD5) license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) / Made available in DSpace on 2015-04-08T12:30:42Z (GMT). No. of bitstreams: 2 DISSERTAÇÃO Francisco Melo da Rocha.pdf: 12498941 bytes, checksum: 5e6a701cfa71e166499f525dd85c775d (MD5) license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Previous issue date: 2014-01-31 / CAPES / A instabilidade de Saffman-Taylor acontece quando um fluido desloca outro de maior viscosidade entre as placas de uma célula de Hele-Shaw. A evolução temporal da interface entre os fluidos é marcada por sucessivas bifurcações, resultando em uma morfologia bastante ramificada. Outro tipo de instabilidade é observado quando, ao invés de injetarmos fluido continuamente, permitimos que a célula rotacione com velocidade angular constante em torno de um eixo que passa pelo seu centro. Nesta versão girante o fator crucial na desestabilização da interface não é mais o contraste de viscosidade, mas sim a diferença de densidade entre os fluidos. A desestabilização ocorre de tal forma que não mais bifurcações são observadas, mas sim uma competição no crescimento das perturbações do fluido menos denso ao penetrar o mais denso. Neste trabalho analisamos uma variante destas instabilidades onde consideramos uma tensão superficial entre os fluidos que depende da curvatura da interface que os separa. Através de uma teoria perturbativa mostramos que o acoplamento entre a tensão superficial variável e efeitos tridimensionais relacionados ao ângulo de contato, podem levar à formação de padrões diferentes dos tradicionamente vistos. Para o problema com injeção, mostramos como esta nova abordagem pode estabilizar (desestabilizar) situações convencionalmente instáveis (estáveis), bem como o fenômeno da bifurcação dos dedos. Já no caso da célula girante, focamos na capacidade do modelo em controlar perturbações lineares e também a competição existente.

No description available.

In searching for information concerning the chain of stations that William Shaw established from the Eastern Frontier of the Cape Colony towards Natal, I found that I had to consult many books. Many sources of information have recently come to light and this had to be analysed as well. In this work much had to be included that did not directly refer to Mount Coke, but it is relevant in that it affected the history of the Mission, and the effect of the Mission on the community as a whole. When histories of all the stations are written the incidents should show up in the right perspective.

Thesis (M.F.A)--Boston University. Submitted in partial fulfillment of the requirements for the degree of Master of Fine Arts. Boston University, School of Fine and Applied Arts, June 1962.

This thesis examines issues of female agency in the plays The Rover and The Widow Ranter by Aphra Behn, Mrs. Warren's Profession by George Bernard Shaw, and Votes for Women! by Elizabeth Robins. The heroines of each of these plays work toward gaining agency for themselves, and in order to achieve this goal, they often stray from cultural norms of femininity and encroach on the masculine world. This thesis postulates that agency for women becomes a fluid notion, not statically defined. These plays show a fluctuating and evolving sense of feminine agency.