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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.
111

Trojaborgarnas dolda agenda : En övergripande beskrivning av trojaborgar i Sverige och en jämförelse av olika teorier om trojaborgarnas funktion / The Hidden Agenda of the Troy Towns

Olsson Söderhäll, Kristina January 2019 (has links)
A Troy Town is a labyrinth either built of stones or made of turf. They can be found in northern Europe, especially in Scandinavia. The number of Troy Towns in Sweden is outstanding. They are around 400. Most of them are situated on the coast but there are still approximatly 80 inland about 20 of which are located on ancient burial grounds from both bronze and iron age. The Troy Towns in Sweden are mostly marked with round circles of stones, the size of human skulls, and placed directly on the ground. The entrance of a Troy Town is often formed as a cross. There are some turf labyrinths left in Denmark, England and Germany but most of them are overgrown by grass and can no longer be seen. The Troy Towns are hard to date. Away from the coast one can examine their contexts whilst along the coast lichenometry and the sea level may be used to determine the age of them. There are different ways to describe the purpose of them depending on what period they belong to and where they are situated. Researchers do not agree on all the theories and many of them are based on older explanations. Still new theories appear. My purpose apart from describing the Troy Towns is to examine and compare the theories and to evaluate their plausibility. / <p>Uppsatsen ventilerad 2019-05-27</p><p>Uppsatsen godkänd 2019-06-12</p>
112

L’art de bâtir à Río Bec (Campeche, Mexique)

Gillot, Céline 02 1900 (has links)
No description available.
113

Utilização de métodos geoelétricos para auxílio do planejamento de lavra em pedreira de gnaisse / Utilization of geoelectrical methods as a tool to aid in work front planning in gneiss mine

Martins, Camila Carroci 06 May 2014 (has links)
Este trabalho apresenta e discute resultados de aplicações de métodos geofísicos elétricos como ferramenta de auxílio no planejamento e lavra em pedreira de gnaisse para fabricação de brita. Neste trabalho a espessura do capeamento foi investigada, além de identificar zonas da transição solo-rocha e mapear o contato entre diferentes litologias para avaliar a profundidade do corpo rochoso na base da cava da pedreira. Para isso foram adquiridos treze SEVs e quatro CE em duas frentes de trabalho, a primeira em outubro de 2011 onde foram adquiridos uma parte dos dados de SEVs e todos os caminhamentos elétricos e a segunda frente em fevereiro de 2012 onde foi adquirido o restante dos dados de SEVs. A metodologia utilizada foi a eletrorresistividade e a polarização induzida, diante do histórico de sucesso em aplicações semelhantes. As SEVs possibilitaram delimitar o contato com a rocha sã em subsuperfície, bem como mostrar as relações entre o xisto e o gnaisse, além de identificar uma possível intercalação xisto-gnaisse na porção oeste da pedreira. Ademais as SEVs sugerem que o contato no mapa geológico deve ser reavaliado, especialmente a SEV04, que de acordo com o mapa estaria em área de gnaisse, mas a sondagem apresentou resistividades muito baixas para esse tipo de litologia. Através dos caminhamentos foi possível identificar o contato entre a rocha da jazida, o gnaisse e o xisto em todas as seções. Especificamente as linhas CE02 e CE04 mostraram os contatos entre as litologias um pouco discordantes do esperado pelo mapa geológico da área da pedreira. Dessa forma, foi possível definir melhor os contatos geológicos em algumas áreas e corroborar a interpretação estrutural em outras áreas, de forma a auxiliar o planejamento de futuras frentes de lavra. / This work presents end discusses the results of applying electrical geophysical methods as a tool to aid in work front planning in gneiss mine for crushed stones application. This mine produces aggregates for civil construction industry and has a gneiss source rock. In this work the topsoil thickness has been investigated, as well the transitional areas between soil and rock. Moreover the contacts between different lithology have mapped in order to assess the source rock´s depth at the mining boundaries. Thereunto thirteen VES and four EP were acquired in two different stages, the first one was performed on October 2011, where a portion of VES and all the EP were acquired. The second stage was on February 2012 to record the rest of VES data. The methodology used was electroresistivity and induced polarization, due the success history of these methodologies in similar applications. VES allowed to define the contact with the bedrock in subsurface and show the relationships between the schist and the gneiss. Moreover those results identified a possible intercalation of schist-gneiss on west portion at the mine. Furthermore the VES suggest a reevaluation in the geological map, mainly where SEV04 took place, because for the map, the contact would be on gneiss environment, but the sounding showed slower resistivity values for this kind of rock. Through the EP was possible to identify the contact between the gneiss and the schist in all the sections. Specifically the lines CE02 and CE04 showed the contact for both lithologies slightly discordant that were expect for the geological map. Thereby was possible to better define the geological contacts in some places and corroborate the interpretation in others, in order to assess the future work front planning for this mine.
114

Avaliação química e termoanalítica de cálculos biliares e bile vesicular humana de pacientes do sexo masculino / Chemical evaluation and termoanalítica of human gallstones and gallbladder bile of male patients

Tortorelli, Cláudia Mônica 23 February 2006 (has links)
Este trabalho teve como meta principal ampliar o estudo anteriormente relatado por Mercuri em 2000, agora com a caracterização química e termoanalítica de cálculos biliares e as biles vesiculares humanas, especificamente, de pacientes do sexo masculino. Para ambos os tipos de caracterização foram utilizadas várias técnicas, como: (a) Análise Elementar (AE), para determinação de teores de C, H e N. (b) Espectroscopia no infravermelho com transformada de Fourier (FTIR), com o objetivo de verificar as bandas de absorção no IV e assim identificar algumas substâncias que fazem parte desses materiais. (c) Difratometria de Raios X (DRX), para identificar formações cristalinas de espécies presentes nas amostras de cálculos biliares. (d) Espectrometria de Absorção Atômica (AAS), para a determinação do teor de alguns metais como por exemplo: Cd, Pb e Cu. (e) Ressonância Magnética Nuclear (RMN), para ratificar a presença de colesterol e afastar a hipótese de ter-se ergosterol na amostra e (f) TG/DTG e DSC aplicadas para o estudo do comportamento térmico das amostras de cálculos biliares e biles. Este trabalho permitiu concluir que: alguns tipos de cálculos biliares do universo de pacientes do sexo masculino que foram estudados puderam ser inseridos na classificação proposta anteriormente, no entanto, cinco dessas amostras não se encaixaram em nenhum desses grupos, sugerindo, com isso, a adição de novos grupos. Verificou-se, também, que a porcentagem de cálculos biliares formados por colesterol é menor para essa classe de pacientes. Em duas amostras de cálculos biliares encontrou-se CaCO3 cristalizado como aragonita, outra indicou a presença de fosfato de cálcio e em duas dessas amostras foram encontrados um alto teor de chumbo. No caso das biles, seis amostras indicaram a presença de NaCl (halita) e uma delas indicou, também, a presença de colesterol. / This work had as goal main to enlarge the study previously related for Mercuri in 2000, now with the chemical and thermoanalytical characterization of gallstones and the human vesicular bile, specifically, of patient of the masculine sex. For both the kinds of characterization were used several techniques, as: (a) Elementary analysis (AE), for contents determination of C, H and N. (b) Fourier Transform Infrared Spectroscopy (FTIR), with objective of verifying the absorption bands in the IV and thus identify some substances that do part of these materials. (c) X-rays diffraction (DRX), to identify present crystalline species formations in the gallstones sample. (d) Atomic Absorption Spectrometry (AAS), for some metals content determination such as: Cd, Pb and Cu. (e) Nuclear Magnetic resonance (RMN), to ratify the cholesterol presence and to remove the hypothesis of have ergosterol in the sample and (f) TG/DTG and DSC applied to the gallstones and bile samples thermal behavior study. This work allowed to conclude that: some universe gallstones kinds of patient of the masculine sex that were studied could be inserted in the proposed classification previously, however, five of these samples did not case in none of these groups, suggesting, with that, the addition of new groups. It verified, also, that the gallstones percentage formatted for cholesterol is smaller for this class of patient. In two gallstones samples were found CaCO3 crystallized as aragonite, other indicated the calcium phosphate presence and in two of these samples were found a Pb high content. In the biles case, six samples indicated presence of NaCl (halita) and their one indicated, also, the cholesterol presence.
115

Síntese, atividade antiurolítica, e estudos de biotransformação de ácidos galoilquínicos de espécies de Copaifera por fungos filamentosos / Synthesis, antiurolithic activity, and biotransformation studies of galloylquinic acids from Copaifera species by filamentous fungi

Abdelsalam, Mohamed Ahmed Mohamed Hamed 31 August 2018 (has links)
Calculo renal, também conhecido como urolitíase, é comum com uma taxa de prevalência estimada global recente de 14,8%, a qual parece estar aumentando, com uma taxa de recorrência em cinco anos de até 50%. As várias atividades biológcas promissoras de extratos de plantas ricas em ácidos galolquínicos, como as folhas das espécies de Copaifera, levaram nosso interesse em sintetizar o éster metílico do ácido 3,4,5-tri-O-galoilquinico trissubstituído (TGAME), com o objetivo de desenvolver um composto com potencial para prevenção de cálculos renais. A síntese total incluiu seis etapas a partir dos ácidos quínico e gálico disponíveis comercialmente. O passo-chave na via sintética foi a esterificação de Steglich viável do quinato de metila com ácido 3,4,5-tribenziloxibenzóico usando diciclo-hexilcarbodiimida e N, N-(dimetilamino)piridina como reagentes de acoplamento. As estruturas químicas do composto final e seus intermediários sintéticos foram elucidados por métodos espectroscópicos, espectrométricos e espectrofotométricos de análises. O efeito potencial do composto sobre a ligação de cristal monoidratado de oxalato de cálcio (COM) à superfície de células de rim caninas tipo I de Madin-Darby (MDCKI) e o crescimento de cristais em modelo de túbulos Malpighi de Drosophila melanogaster foi investigado. As quantidades de membrana, citosólica e total de Annexina A1 (ANXA1), Alfa-enolase e HSP90 foram examinadas por análise de transferência de Western após fracionamento subcelular, as quais foram confirmadas por coloração por imunofluorescência de células cultivadas. O pré-tratamento de células MDCKI com TGAME por até 6 h diminuiu significativamente a ligação de cristal COM de uma maneira dependente da concentração. O TGAME (50 ?M) inibiu significativamente a expressão superficial de ANXA1 por microscopia de imunofluorescência, enquanto o ANXA1 intracelular aumentou. A análise de Western Blot confirmou alterações de expressão de ANXA1 na membrana e frações citosólicas de células tratadas com os compostos, enquanto a ANXA1 de células inteiras permaneceu inalterada. O TGAME também diminuiu significativamente o tamanho, o número e o crescimento de cristais de COM induzidos em um modelo de túbulos Malpighi de Drosophila melanogaster, o qual apresentou também potente atividade antioxidante em um ensaio de DPPH. Adicionalmente, realizamos estudos de biotransformação de derivados do ácido galoilquínico, utilizando fungos filamentosos, para prever seus comportamentos farmacocinéticos. Os resultados mostraram que os ácidos galoilquínicos das folhas de Copaifera lucens (fração n-butanólica, BF) foram transformados por Aspergillus alliaceus em um metabólito majoritário, o ácido 3-O-metil gálico (M1), que é um dos metabolitos conhecidos do ácido gálico estudado em humanos. O produto biotransformado foi identificado por UPLC-MS/MS. O pré-tratamento de células MDCKI com BF e seu produto transformado por 3 h diminuiu significativamente a ligação de cristal COM a estas células em concentrações de 50 ?g/mL e 5 ?M, respectivamente. Os compostos reduziram significativamente a expressão superficial das ANXA1 e HSP90 (proteínas de ligação COM) como evidenciado por microscopia de imunofluorescência, enquanto o nível intracelular aumentou. A análise por Western blot confirmou estas alterações nas frações de membrana e citosol das células tratadas com estes compostos, enquanto as células inteiras permaneceram inalteradas. M1 também apresentou atividade antioxidante promissora no ensaio DPPH. / Renal stone disease, also known as urolithiasis, is common with a recent overall estimated prevalence rate of 14.8% that appears to be rising, with a five-year recurrence rate of up to 50%. The promising diverse bioactivities of plant extracts rich in galloylquinic acids such as Copaifera species leaves prompted our interest to synthesize the tri-substituted 3,4,5-tri-O-galloylquinic acid methyl ester (TGAME), with the goal of developing a lead compound for kidney stone prevention. The total synthesis included six steps starting from commercially available quinic and gallic acids. The key step in the synthetic pathway was through Steglich esterification of methyl quinate with 3,4,5-tribenzyloxybenzoic acid using dicyclohexylcarbodiimide and N,N-(dimethylamino) pyridine as the coupling reagents. The chemical structures of the final compound and its synthetic intermediates were elucidated by spectroscopic, spectrometric and spectrophotometric methods of analyses. The potential effect of the compound on calcium oxalate monohydrate (COM) crystal binding to the surface of Madin-Darby Canine Kidney Cells type I (MDCKI) and crystal growth in a Drosophila melanogaster Malpighian tubule model were investigated. Membrane, cytosolic and total Annexin A1 (ANXA1), ?-enolase and HSP90 amounts were examined by Western blot analysis after subcellular fractionation, then confirmed by immunofluorescence staining of cultured cells. Pretreatment of MDCKI cells with TGAME for up to 6 h significantly diminished COM crystal-binding in a concentration-dependent manner. TGAME (50 ?M) significantly inhibited ANXA1 surface expression as evident by immunofluorescence microscopy, whereas intracellular ANXA1 increased. Western blot analysis confirmed ANXA1 expression changes in the membrane and cytosolic fractions of compound-treated cells, whereas the whole cell ANXA1 remained unchanged. TGAME also significantly decreased the size, number, and growth of COM crystals induced in a Drosophila melanogaster Malpighian tubule model, and possessed a potent antioxidant activity in a DPPH assay. We also have performed a biotransformation study of galloylquinic acid compounds using filamentous fungi to predict their pharmacokinetic behaviors. The results showed that galloylquinic acids from Copaifera lucens leaves (n-butanolic fraction, BF) were transformed by Aspergillus alliaceus into one major metabolite 3-O-methyl gallic acid (M1), which is one of the known metabolites of gallic acid studied in humans. The biotransformed product was identified by UPLC-DAD-MS/MS and 1H NMR. Pretreatment of MDCKI cells with BF (50 ?g/mL) and its transformed product M1 (5 ?M) for 3 h significantly diminished COM crystal-binding to these cells. The compounds significantly reduced surface expression of ANXA1 and HSP90 (COM-binding proteins) as evidence by immunofluorescence microscopy, whereas the intracellular level increased. Western blot analysis confirmed these changes in membrane and cytosolic fractions of compound-treated cells, whereas whole cells remained unchanged. M1 also showed a promising antioxidant activity in DPPH assay.
116

Utilização de métodos geoelétricos para auxílio do planejamento de lavra em pedreira de gnaisse / Utilization of geoelectrical methods as a tool to aid in work front planning in gneiss mine

Camila Carroci Martins 06 May 2014 (has links)
Este trabalho apresenta e discute resultados de aplicações de métodos geofísicos elétricos como ferramenta de auxílio no planejamento e lavra em pedreira de gnaisse para fabricação de brita. Neste trabalho a espessura do capeamento foi investigada, além de identificar zonas da transição solo-rocha e mapear o contato entre diferentes litologias para avaliar a profundidade do corpo rochoso na base da cava da pedreira. Para isso foram adquiridos treze SEVs e quatro CE em duas frentes de trabalho, a primeira em outubro de 2011 onde foram adquiridos uma parte dos dados de SEVs e todos os caminhamentos elétricos e a segunda frente em fevereiro de 2012 onde foi adquirido o restante dos dados de SEVs. A metodologia utilizada foi a eletrorresistividade e a polarização induzida, diante do histórico de sucesso em aplicações semelhantes. As SEVs possibilitaram delimitar o contato com a rocha sã em subsuperfície, bem como mostrar as relações entre o xisto e o gnaisse, além de identificar uma possível intercalação xisto-gnaisse na porção oeste da pedreira. Ademais as SEVs sugerem que o contato no mapa geológico deve ser reavaliado, especialmente a SEV04, que de acordo com o mapa estaria em área de gnaisse, mas a sondagem apresentou resistividades muito baixas para esse tipo de litologia. Através dos caminhamentos foi possível identificar o contato entre a rocha da jazida, o gnaisse e o xisto em todas as seções. Especificamente as linhas CE02 e CE04 mostraram os contatos entre as litologias um pouco discordantes do esperado pelo mapa geológico da área da pedreira. Dessa forma, foi possível definir melhor os contatos geológicos em algumas áreas e corroborar a interpretação estrutural em outras áreas, de forma a auxiliar o planejamento de futuras frentes de lavra. / This work presents end discusses the results of applying electrical geophysical methods as a tool to aid in work front planning in gneiss mine for crushed stones application. This mine produces aggregates for civil construction industry and has a gneiss source rock. In this work the topsoil thickness has been investigated, as well the transitional areas between soil and rock. Moreover the contacts between different lithology have mapped in order to assess the source rock´s depth at the mining boundaries. Thereunto thirteen VES and four EP were acquired in two different stages, the first one was performed on October 2011, where a portion of VES and all the EP were acquired. The second stage was on February 2012 to record the rest of VES data. The methodology used was electroresistivity and induced polarization, due the success history of these methodologies in similar applications. VES allowed to define the contact with the bedrock in subsurface and show the relationships between the schist and the gneiss. Moreover those results identified a possible intercalation of schist-gneiss on west portion at the mine. Furthermore the VES suggest a reevaluation in the geological map, mainly where SEV04 took place, because for the map, the contact would be on gneiss environment, but the sounding showed slower resistivity values for this kind of rock. Through the EP was possible to identify the contact between the gneiss and the schist in all the sections. Specifically the lines CE02 and CE04 showed the contact for both lithologies slightly discordant that were expect for the geological map. Thereby was possible to better define the geological contacts in some places and corroborate the interpretation in others, in order to assess the future work front planning for this mine.
117

Caracterização experimental de soluções de reforço para placas de rochas ornamentais / Experimental characterization of reinforcement to ornamental stones slabs

Pazeto, Abiliane de Andrade 20 March 2017 (has links)
Um grande número de rochas de granulação grosseira tem valor agregado muito alto quando usadas como materiais de construção, as chamadas rochas exóticas. No entanto, existem problemas com a utilização desses materiais dado a sua fragilidade, que está relacionada com a sua textura muito heterogênea. No Brasil é empregado empiricamente um reforço (compósito) que utiliza resina epóxi e fibra de vidro para melhorar o desempenho mecânico de tais rochas quando empregadas como materiais de construção. Os objetivos da presente pesquisa foram estudar o reforço tradicional brasileiro (telagem) para determinar sua eficiência e, ao mesmo tempo, propor outras soluções de reforço alternativas e mais eficientes, e avaliá-las através da caracterização mecânica experimental. Foi proposto um critério denominado Declive Global para avaliar as tensões de serviço dos materiais pegmatíticos estudados, quando os reforços propostos foram aplicados. Para validar esse critério foi utilizado um sistema de correlação digital de imagem (CDI) para observar e medir o comportamento de deformação e fratura durante a realização de testes de flexão em 4 pontos. Tanto o critério proposto como a CDI mostraram que a propagação de fissuras ocorre muito antes do material atingir a carga máxima. O reforço alternativo proposto, que emprega resina epóxi e uma fibra de vidro 600 g/m² apresentou o melhor desempenho mecânico, elevando a carga de ruptura até 6x em comparação com as amostras onde nenhum reforço foi aplicado. Os resultados demonstrados pelos reforços propostos são promissores e aumentam a possibilidade de aplicar rochas exóticas frágeis como materiais de construção, além do critério proposto fornecer uma ferramenta importante para a compreensão mecânica prévia de produtos de rocha que utilizam reforços compósitos. / A great number of coarse-grained natural stones have very high added-value when used as building materials, the so called exotic stones. However, problems using these materials arise from its brittleness behavior, which are related to its very heterogeneous texture. Glass fiber-reinforced epoxy composite (GFRC) is being used to improve mechanical performance of such stones when employed as building materials. The objectives of this present investigation it were studying the Brazilian traditional reinforcement to determinate its efficiency and, at the same time, a number of alternative solutions were proposed and evaluated through experimental mechanical characterization. It was proposed a slope-based criterion to evaluate the useful service loads of pegmatitic materials when glass fiber-reinforcement is applied. To validate the proposed criterion, a digital image correlation (DIC) system was employed to observe and measure strain and fracture behavior during the realization of 4-point bending tests. Both proposed criterion and DIC show that crack propagation occurs long before the material reaches maximum load. GFRC acts as a crack inhibitor, raising the breaking load up to 6x in comparison with the specimens where no reinforcement was applied. The results from this study enhance the capability to apply such materials as building materials and provide an important tool to perform prior mechanical understanding of stone products using GFRC.
118

Bildstenarna och den muntliga traditionen på Gotland under yngre järnålder

Andersson, Josefina January 2009 (has links)
<p>Andersson, J. 2008. <em>Bildstenarna och den muntliga traditionen på Gotland under yngre järnålder</em>. <em>The Picture Stones and the Oral Tradition of Gotland During the Late Iron Age. </em>Högskolan i Kalmar ht 2008.</p><p>This is a study of the picture stones of Gotland and the oral tradition connected to them. This study consists of two main parts; in the main part the discussion focus on the oral tradition and the continuity of the same, where the memory plays a significant role. It also contains a discussion of the physical environment and its influences of the oral tradition. The second part concentrates around the picture stones, the variation of the scenes and the numerous of them. </p><p>Keywords: oral traditions, picture stones, late iron age, Gotland, Nordic mythology.</p><p> </p><p> </p>
119

Skärvstenshögar med människoben i norra Mälarområdet / Mounds of fire-cracked stones with human bones in the region north of lake Mälaren

Noge, Anna-Sara January 2008 (has links)
<p>Mounds of fire-cracked stones is a typical Bronze Age monument for the region around lake Mälaren. They are usually, because of their content, interpreted as piles of rubbish. But as they often have kerbs, are situated on cemeteries and sometimes contain human bones, the traditional interpretation is not fully satisfactory.</p><p>The main focus of this essay is on the mounds of fire-cracked stones which contain human bones in the region north of lake Mälaren. With a detailed study of these, and a comparison with those without human bones, my aim is to get closer to an explanation why the human bones were deposited. The essay consist of a comp­ilation  of 98 excavated mounds and a database with various information gathered from excavation reports and archive documents.</p><p>With different kinds of osteological aspects taken in consideration, the study shows that human bones have been found in about a third of the mounds. The mounds with human bones more often have kerbs. The same types of artefacts are found both in mounds with and without human bones. A significant difference is that the mounds with human bones contain more categories of artefacts and sometimes even bronze. The study also shows that there is nothing that indicates that the bones were deposited after the primary use of the mound. The human bones could therefore had been deposited contemporary to the “rubbish”. To understand this phenomenon I strongly believe that the mounds no longer only can be interpreted as heaps of garbage.</p>
120

Kiviksgraven : analys av dess historia och framtid sett utifrån bevaringsfrågor / The Kivik monument : an analysis of its history and future from a preservation angle

Klintberger Wändahl, Anna January 2009 (has links)
<p>This essay focuses upon the Kivik monument and its conservation difficulties, since its discovery at 1748 until modern time. The Kivik monument is found in southeast of Scania, and dated within the Bronze Age period. The perspective of the conservation on the monument has merely been on the monuments inner cist of stone and the rock carvings on the cist-slabs. When the monument was first archaeological examined at 1931, its sizeable cairn (75 m in diameter) had almost vanished and the cist was sheltered by a casing of concrete and metal roof. Between 1932 and 1933 the monument has undergone a large-scale restoration, and this criticized restoration resulted in a low antiquarian value with the responsible authority. With a low antiquarian value, the protection of ancient monuments by national laws is nearly none and the interest by responsible authority is insignificantly. This has lead to substandard preservation of the monument and its surrounding area. By comparing the Kivik monument with the monument Ales stones, who undergone equal restorations, I discovered that Ales stones is still considered an intact ancient monument with a high antiquarian value with the responsible authority and therefore in a good state of preservation. This is probably a result of that the restorations of the Kivik monument contain none authentic material as concrete and its museological construction, which Ales stones is not and therefore perceived as a genuine ancient monument.</p>

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