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The Global ETD Search service is a free service for researchers
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Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
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Showing 1 to 3 of 3 (0.021 seconds)| 1 |
Tamara de Lempicka : Kunstkritik und Künstlerinnen in Paris /Thormann, Ellen. January 1993 (has links)
Texte remanié de: Diss.--Universität--Hamburg, 1989. / Bibliogr. p. 235-255.
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Secagem de tamara (Phoenix dactylifera L.) para obtenção de tamara passaPrado, Monica Elisabeth Torres 16 November 1998 (has links)
Orientador: Kil Jin Park / Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia de Alimentos / Made available in DSpace on 2018-07-24T09:35:52Z (GMT). No. of bitstreams: 1
Prado_MonicaElisabethTorres_D.pdf: 9993030 bytes, checksum: e0ad297d796382611034068672717694 (MD5)
Previous issue date: 1998 / Resumo: Estudou-se o comportamento do processo de secagem de tâmaras da variedade Zahidi, a fim de se obter uma tâmara-passa deste fruto, que vem apresentando boas perspectivas de cultivo e comercialização no Brasil. Os dados experimentais das ísotermas de sorção nas temperaturas de 60, 70 e 80 °C, com umidade relativa variando de 10,51% a 80,25% obtida através de soluções saturadas de sais , foram ajustadas pelos modelos de BET, GAB, Halsey e Oswin. Os melhores ajustes foram obtidos peias equações de BET e GAB. O encolhimento foi determinado e correlacionado com a perda de umidade através dos modelos propostos por SUZUKI et al. (1978). Para a caracterização da geometria do fruto foram testadas quatro formas geométricas distintas: cilindro com tampa, cilindro sem tampa, elipse oblata e elipse proiata. Os resultados mostraram que a tâmara pode ser considerada um cilindro sem tampa. As corridas experimentais de secagem foram conduzidas em um secador vertical convectivo, nas temperaturas de 60, 70 e 80 ° C, com umidade relativa variando de 6,68 a 11,59%. As curvas de secagem foram ajustadas peia equação de difusão líquida para geometria esférica e geometria cilíndrica do material, considerando ou não o encolhimento. A melhor correlação das curvas de secagem foi obtida utilizando o modelo difusional de Fick para a geometria cilíndrica da tâmara considerando o encolhimento. Os valores de difusividade efetiva foram de 1,02 .10-7 a 4,52 . 10-7 m2/s para curvas de secagem sem encolhimento e de 0,71 .10-7 a 3,81 . 10-7 m2/s para curvas com encolhimento. A energia de ativação de Arrhenius foi calculada para os valores de difusividade sem e com a consideração do encolhimento, variando de 41,23 kj/mol. K a 60,98 kj/mol. Ke de 36,35 kj/mol. K a 69,59 kj/mol. K, respectivamente / Abstract: Drying process behavior of date was studied to obtain dried date (passa). The production and commerciaiization of date are successfully growing in Brazil. The experimentai values of sorption isotherms at 60, 70 and 80°C were obtained at relative humidity ranging from 10,51 % to 80,25% and were correlated by BET, GAB, HALSEY and OSWIN model. BET and GAB models presented the best
correlation. The shrinkage during drying was observed and verified by SUZUKí et ai (1978) equations'. Date geometric forms were characterized by four different shapes-cylinder with caps, cylinder without caps, oblate ellipse and prolate ellipse. The results indicate that the date may be considered as a cylinder without caps. The experimental drying curves were obtained to 60, 70 and 8Q°C in a convective vertical dryer. The relative humidity ranged from 6.66% to 11.59%. The drying curve was using Fick's second law for liquid diffusion solved for spherical and cylindrical boundaries, with and without shrinkage. The best correlation was obtained to cylindrical geometry with shrinkage. Effective diffusivity obtained ranged from 1.02 . 10-7 to 4,52 . 10-7 m2/s without shrinkage and from 0.72 . 10-7 to 3,81 . 10-7 m2/s with shrinkage. Arrenious type activation energy was calculated using the effective diffusivities, ranging from 41,23 kJ/mol. K to 60,98 kJ/mol. K without and from 36,35 kJ/mol. K to 69,59 kj/mol. K with shrinkage / Doutorado / Doutor em Engenharia de Alimentos
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Shaping the fieldPerlina, Anna 18 November 2016 (has links)
Die vorliegende wissenschaftliche Arbeit rekonstruiert die Entwicklung der deutschen Psychologie zwischen der Eröffnung des ersten psychologischen Labors in 1879 und der Gleichschaltung durch das Nazi-Regime in den 1930er Jahren. Die Dissertation stellt den konzeptuellen und methodologischen Rahmen der psychologischen Disziplin anhand von drei Generationen von Pionierforschung dar. Hierbei wird herausgearbeitet, wie sich die frühe experimentelle Psychologie einen eigenen Platz zwischen den Natur- und Geisteswissenschaften kreiert. Die gestaltpsychologische Schule spielt darin eine entscheidende Rolle. Der zentrale Fokus der Arbeit liegt in der historischen Periode zwischen 1922 und 1936, über welche sich Kurt Lewins Untersuchungen zur Handlungs- und Affektpsychologie erstrecken. In dieser deutschen Schaffensperiode wurden der theoretische und methodologische Rahmen, sowie praktische experimentelle Designs erschaffen, welche die amerikanische Arbeit Lewins entscheidend prägten. Der Aufbau von Lewins berühmter Feldtheorie wird im Detail rekonstruiert. Die Dissertation zeigt auf, wie Lewin originelle psychologische Konzepte aus interdisziplinärer Erfahrung formte, und wie experimentelle Praktiken der Zeit die Entstehung eines immer komplexer werdenden Konzeptgerüstes herbeiführten. Anschließend wird die Bedeutung des Gestalt-Lewin-Falles für die Psychologiegeschichte erörtert. In die langfristige Wissenschaftsgeschichte ist Lewins Arbeit nicht etwa als gebündeltes Forschungsgebiet eingegangen. Stattdessen ist sie in so unterschiedliche Bereiche wie Entwicklungs- und Persönlichkeitspsychologie, Soziologie und Wirtschaftsmanagement eingeflossen und hat diese geprägt. / This dissertation represents a historical reconstruction of the development and transformation of German experimental psychology between the emergence of the first experimental laboratory in 1879 and its Gleichschaltung by the Nazi regime in the 1930s. It traces the evolution of the conceptual as well as the experimental framework of psychology over the course of these years following three generations of experimental research. Hereby, the work attempts to grasp how early experimental psychology negotiated its place between the humanities and the natural sciences. The project’s major focus lies in the period between 1922 and 1936, in which Kurt Lewin’s Berlin Experimental Program on Action and Emotions took place. The work specifically investigates the process of constitution of Lewin’s field theory, a system of concepts coined by Lewin in order to study psychological processes underlying human conduct. The dissertation shows how Lewin’s concepts emerged out of interdisciplinary sources, and how experimental practices in psychology triggered the emergence of new knowledge. Eventually, it is shown how the investigated historical case of Gestalt psychology in Berlin fits into and plays a decisive role in the long-term development of experimental psychology.
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