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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    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.
11

Caracterização do comportamento da ionosfera durante eventos " magnetic crochets"

Almeida, Alexandre Rodel de 15 February 2017 (has links)
Submitted by Rosa Assis (rosa_assis@yahoo.com.br) on 2017-09-27T15:26:54Z No. of bitstreams: 2 Alexandre_Rodel_Almeida.pdf: 4116056 bytes, checksum: 5bc4c8bbde7317bac5b10754faa7b9bd (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) / Approved for entry into archive by Paola Damato (repositorio@mackenzie.br) on 2017-10-02T14:44:26Z (GMT) No. of bitstreams: 2 Alexandre_Rodel_Almeida.pdf: 4116056 bytes, checksum: 5bc4c8bbde7317bac5b10754faa7b9bd (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) / Made available in DSpace on 2017-10-02T14:44:26Z (GMT). No. of bitstreams: 2 Alexandre_Rodel_Almeida.pdf: 4116056 bytes, checksum: 5bc4c8bbde7317bac5b10754faa7b9bd (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Previous issue date: 2017-02-15 / Fundo Mackenzie de Pesquisa / In the present work a statistical study involving medium and high intensity solar flares occurred between 2011 and 2015, in the diurnal period, in the Brazilian territory is presented. This statistic provides important information about the flares associated with rare events called "magnetic crochets", which are variations in the horizontal component of the surfacial geomagnetic field associated with the electromagnetic radiation of the Sun. For a better understanding of these phenomena and for the characterization of the behavior of the ionosphere during the "magnetic crochets", some examples are shown in which ionospheric, solar and geomagnetic parameters are compared. This type of analysis is infrequent nowadays and the literature does not present studies with such characteristics in the region of South America involving ionospheric soundings. The results show a good correlation between more intense X-ray and H-alpha explosions originating in active regions with more complex magnetic structures near the central meridian on the solar disk, which occurred around 15:00 UT (~ 12:00 local time Time), with a considerable number of "crochets". The results also show variations in the horizontal component of the atipically high surfacial geomagnetic field at stations around 22 ° south latitude, while in other regions of the globe the variations in this latitude range are smaller than in the equatorial regions, suggesting anomaly's influence in this region of South America. Results of the analysis related to the low ionosphere showed a good correlation between the more impulsive and intense events in the X-ray range of 0.4 to 1 Angstrom, with modification in the height of reflection of the signal in (VLF) and conductivity change at the ionosphere's base, which may suggest a characteristic of flares associated with magnetic crochets. / No presente trabalho é apresentado um estudo estatístico envolvendo flares solares de média e alta intensidade ocorridos entre 2011 e 2015, no período diurno, no território brasileiro. Essa estatística fornece informações importantes a respeito dos flares associados a eventos raros denominados “magnetic crochets”, que são variações na componente horizontal do campo geomagnético superficial associadas a radiação eletromagnética do Sol. Para melhor entendimento desses fenômenos e para a caracterização do comportamento da ionosfera durante os “magnetic crochets”, são mostrados alguns exemplos nos quais são comparados parâmetros ionosféricos, solares e geomagnéticos. Esse tipo de análise é pouco frequente atualmente e a literatura não apresenta estudos com tais características na região da América do Sul envolvendo sondagem ionosférica. Os resultados apresentados mostram boa correlação entre explosões mais intensas em raios-X e H-alfa originadas em regiões ativas com estruturas magnéticas mais complexas das proximidades do meridiano central no disco solar, ocorridas em torno das 15:00 UT (~12:00 Local Time), com um número considerável de “crochets”. Os resultados também mostram variações na componente horizontal do campo geomagnético superficial atipicamente alta em estações em torno de 22º de latitude Sul, enquanto que em outras regiões do globo as variações nessa faixa de latitude são menores do que nas regiões equatoriais, sugerindo influência da região da anomalia magnética presente nessa região da América do Sul. Resultados da análise relacionada à baixa ionosfera mostraram boa correlação entre os eventos mais impulsivos e intensos na faixa dos raios-X de 0,4 a 1 Angstrom, com modificação na altura de reflexão do sinal em frequências rádio muito baixas (VLF) e modificação da condutividade na base da ionosfera, o que pode sugerir uma característica de flares associados aos “magnetic crochets”.
12

Emergent Explorations: Analog and Digital Scripting

Worden, Alexander 13 June 2011 (has links)
This book documents an exploration of emergent and linear modes of defining space, form, and structure. The thesis highlights a dialog between analog and digital modeling techniques, in concept and project development. It identifies that analog modeling techniques, coupled with judgment, can be used to develop complex forms. The thesis project employs critical judgment and the textile techniques of crochet as a vehicle generate form. Crochet lends itself to this investigation because it is a serial process of fabrication that allows for the introduction of specific non-linear modifications. The resulting emergent forms produced by this mode of working can be precisely described by digital modeling techniques. These analog crochet models are translated into the digital through the employment of advanced digital modeling tools. This translation enables the visualization, development, testing, and execution of an architectural space, form, and structure. / Master of Architecture
13

Home Sweet Home: An Infinite Grid Of Memory And Repressed Abuse Trauma

Bush, Melissa 01 January 2013 (has links)
Incorporating traditional craft mediums of crochet and embroidery, I use digital technology to experiment with wording to graphically represent my abuse trauma. Due to the severity of the subject matter and the work ethic I employ in my art practice, using my hands and being completely involved is a form of masochistic pleasure. My process takes on a Sisyphean approach of penance for the sins of others in my work. During my studio practice, my process reaches a meditative state where my mind is clear and free of the burden. Once I've completed a panel of trauma, the burden is transported into the art and a state of enlightenment is achieved. I began this program taking an analysis from an external perspective, gradually shifting my focus of artistic practice to my internal struggles with memory and repressed abuse trauma. Since I have selfishly focused on my personal tragedies for inspiration for the past three years, my work can now address a more universal subject matter in the future
14

Fibonaccibikini: Hyperbolische Geometrien im Raum: 2. Platz

Haberland, Heinke 17 November 2023 (has links)
Die extensive Zunahme von lebendigem Wachstum am Beispiel der mathematischen Fibonacci-Folge ergibt räumliche Strukturen von eigentümlichen Stülpungen und Auffaltungen, die den universellen Gesetzmäßigkeiten des Kosmos gehorchen. Solche mathematisch-abstrakten Ideen wollte ich dreidimensional in Skulpturen umsetzen und versuchte erst vergeblich, mir die daraus enstehenden räumlichen Körper rein imaginär vorzustellen und zeichnerisch oder klassisch skulptural umzusetzen – doch erst als mir die Idee kam, entlang dieser Gesetzmäßigkeiten zu häkeln, gelang es.
15

Molecular study on efficacy of benzimidazoles against the canine hookworm Ancylostoma caninum in dogs

Nezami, Roxana 08 1900 (has links)
Ancylostoma caninum, un nématode parasite, présente une prévalence élevée chez les chiens dans le monde. L'ankylostomiase canine peut être diagnostiquée à l'aide de tests coprologiques qui détectent les œufs ressemblant à des ankylostomes, ainsi que la présence de symptômes tels que l'anémie et les selles noires. Ces dernières années, le nombre de rapports établissant une résistance aux anthelminthiques chez A. caninum aux États-Unis d’Amérique a considérablement augmenté. Cette tendance émergente a incité notre enquête sur la possibilité qu’un scénario similaire se produise au Canada. L'objectif de cette étude était d'étudier la survenue d'une infection à A. caninum chez un groupe de chiens de refuge au Québec ayant préalablement reçu un traitement anthelminthique. De plus, l'étude visait à évaluer l'établissement potentiel d'une résistance anthelminthique contre ce parasite en employant des approches modifiées pour détecter les infections à faible prévalence. La procédure d'examen a été réalisée dans deux groupes distincts : un groupe local et un groupe composé de trois chiens des États-Unis d'Amérique (groupe USA). Le test coprologique a été réalisé avant et après un traitement anthelminthique incluant les benzimidazoles. De plus, la présence d'A. caninum a été confirmée par une amplification PCR précise du gène ITS-2. Le groupe local a montré un effet thérapeutique significatif après avoir reçu du fenbendazole. L'identification d'une mutation hétérozygote au niveau du codon 167 du gène de l'isotype 1 de la β-tubuline dans le groupe américain a été réalisée par analyse moléculaire. Ainsi, en évaluant les résultats thérapeutiques du fenbendazole, nous pouvons confirmer son efficacité variable comme anthelminthique contre A. caninum. De plus, des preuves moléculaires indiquent la présence d'isolats résistants dans le pays, ce qui pourrait potentiellement constituer un défi important pour contrôler les nématodes gastro-intestinaux chez les animaux de compagnie / Ancylostoma caninum, a parasitic nematode, exhibits a high prevalence in dogs globally. Canine ancylostomiasis can be diagnosed using coprological tests that detect hookworm-like eggs, as well as the presence of symptoms such as anaemia and dark stool. In recent years, there has been a significant rise in the number of reports establishing anthelmintic resistance in A. caninum within the United States of America. This emerging trend has prompted our investigation on the possibility of a similar scenario occurring in Canada. The objective of this study was to investigate the occurrence of A. caninum infection in a group of shelter dogs in Quebec who had previously received anthelmintic treatment. Additionally, the study aimed to assess the potential establishment of anthelmintic resistance against this parasite by employing modified approaches to detect infections with a low prevalence. The examination procedure was carried out in two distinct groups: a native group and a group consisting of three dogs from the United States of America (USA group). The coprological test was undertaken both prior to and following anthelmintic treatment, which included the benzimidazoles. Moreover, A. caninum presence was confirmed via precise PCR amplification of the ITS-2 gene. The native group showed a significant treatment effect after receiving fenbendazole. The identification of a heterozygous mutation at codon 167 on the β-tubulin isotype-1 gene in the USA group was achieved through molecular analysis. Thus, by assessing the therapeutic outcomes of fenbendazole, we can confirm its varying effectiveness as an anthelmintic against A. caninum. Additionally, molecular evidence indicates the presence of resistant isolates in the country, which could potentially pose a significant challenge for controlling gastrointestinal nematodes in companion animals.
16

Rigidité du crochet de Poisson en topologie symplectique

Rathel-Fournier, Dominique 09 1900 (has links)
No description available.
17

Structures de Nambu et super-théorème d'Amitsur-Levitzki

GIÉ, Pierre-Alexandre 19 November 2004 (has links) (PDF)
Dans cette étude, nous cherchons à établir des identités polynomiales dans le cadre de la combinatoire non-commutative. Dans un premier temps, nous présentons de nouvelles structures de Nambu-Lie, en classifiant totalement les (n-1)-structures sur l'espace R^n, et en donnant une méthode permettant de construire des crochets de tout ordre sur une algèbre de Lie. Nous proposons également une quantification de l'une de nos structures, grâce aux polynômes standards et aux algèbres de Clifford d'indice pair. Dans un second moment, en généralisant la notion de polynôme standard au cas des algèbres graduées, nous cherchons à démontrer une version du théorème d'Amitsur-Levitzki sur les superalgèbres de Lie osp(1,2n) en suivant une démonstration de Kostant dans le cas classique. Nous sommes amenés à démontrer des super-versions des propriétés et résultats nécessaires à la démonstration dans le cas classique, notamment en définissant un super-opérateur de transgression de Cartan-Chevalley.
18

Opérateurs de Rankin-Cohen et matrices de fusion / Rankin-Cohen Operators and fusion matrices

Medina luna, Manuel Jair 26 January 2016 (has links)
Ce travail est consacré a l'étude des déformations covariantes des orbites co-adjointes du groupe de Lie SL(2,R).Nous établissons un lien entre des méthodes de quantification basées sur les crochets de Rankin-Cohen et les matrices de fusion pour les modules de Verma. Par ailleurs nous formalisons et étudions la notion associée d'algèbre de Rankin-Cohen qui contrôle l'associativité de ces déformations. / This work is devoted to the study of covariant star-product on coadjointorbits of the Lie group SL(2,R). We establish a correspondence between two quantization methods. The first is based on the Rankin-Cohen brackets and the second is based in the canonical element associate to the Shapovalov form and fusion matrices for Verma modules.Furthermore we formalize and study the associated notion of non-commutative algebra that controls the associativity of these deformations.
19

Personalisering med virkning : Emotionellt hållbara produkter genom prosumtion ochanvändarcentrerade metoder / Personalization with crochet : Emotional sustainable products through prosumption anduser-centred methods

Ekberg, Gry January 2023 (has links)
Studien undersöker hur man med virkningen kan göra det möjligt för användaren att agera somprosument, samtidigt som de kan personalisera en produkt som bidrar till emotionell hållbarhet.Anledningen var för att öka det emotionella värdet i produkten vilket leder till en längre livscykel. Teoriernasom lade grund för projektet är design för emotionell hållbarhet, design för personalisering, samtprosumtion. Vidare användes användarcentrerade metoder för att skapa stor förståelse för användarensbehov och önskemål. Intervjuer och enkäter samlade in grundinformation, medan återkopplingoch användartester med användaren gav en djup förståelse av deras behov inom det specifikaforskningsområdet. Designmetoder som skiss, prototyper, experiment, urvalsmetoder, samt produktresaformade slutkonceptet och resultatet av studien. Detta var ett avlastningsbord där användaren agerarsom prosument genom att virka två av hyllplanen samtidigt som de ytbehandlar träkonstruktionen själva.Det gör det möjligt att personalisera produkten, vilket leder till emotionell hållbarhet. I diskussionen tasdet slutligen upp förslag på vidareutveckling som lyfter vikten av användarcentrerade metoder för enlyckad emotionellt hållbar produkt. / The study explores how crochet can enable users to act as prosumers while also personalizing a productthat contributes to emotional sustainability. The reason for this is to increase the emotional value of theproduct, which leads to a longer life cycle. The theories that formed the basis of the project are designfor emotional sustainability, design for personalization, and prosumption. User-centred methods werefurther used to create a deep understanding of user needs and desires. Interviews and surveys gatheredbasic information, while feedback and user testing provided a deeper understanding of their needswithin the specific research area. Design methods such as sketching, prototypes, experiments, selectionmethods, and product journeys shaped the final concept and outcome of the study. This was a side tablewhere the user acts as a prosumer by crocheting two of the shelves while also finishing the woodenconstruction themselves. This enables personalization of the product, leading to emotional sustainability.The discussion finally presents suggestions for further development that emphasize the importance ofuser-centred methods for a successful emotionally sustainable product.
20

Procédés d'assemblage dans la technologie de transformation des tissus : Tapis de l'Ile d'Orléans

Mathieu, Jocelyne 11 April 2018 (has links)
Québec Université Laval, Bibliothèque 2012

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