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Dissertationen zum Thema „Cristobalit“

Autor: Grafiati

Veröffentlicht am 4. Juni 2021

Zuletzt aktualisiert am 16. Februar 2022

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1

Janek, Ondřej. "Vliv tepelné expozice na pórovou strukturu a mineralogii hutného dinasu." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2017. http://www.nusl.cz/ntk/nusl-265425.

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Silica bricks is a refractory building material which contains at least 93 % of silicon dioxide in polymorphic forms, mostly -tridymite, -cristobalite and unreacted -quartz. In glass industry is used for building crowns of glass tanks and in coke industry is used for building coke oven batteries. The advantage is the high refractoriness under load, high resistance to acidic melts. The disadvantage is the low resistance to changes in temperature below 600 °C. The thesis deals with the influence of repeated firing on the silica bricks and to its porous structure and mineralogical composition.

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2

Bürgisser, Christa S. "Transportverhalten von nicht-linear sorbierenden Stoffen in chromatographischen Säulen am Beispiel der Adsorption an Cristobalit /." [S.l.] : [s.n.], 1994. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=10653.

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3

Harima, Eiji. "Estabilização da fase β e obtenção da fase α da cristobalita a partir do resíduo da casca de arroz queimada." Universidade de São Paulo, 1997. http://www.teses.usp.br/teses/disponiveis/88/88131/tde-25112014-160127/.

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A sílica obtida da queima de casca de arroz foi convertida nas fases α e β. A estabilização da fase β foi obtida pela introdução de alumínio e cálcio na rede de sílica, 10001100 °C, na proporção CaO:2Al2O3:38SiO2. Foi observado que a transição de fase α→β da cristobalita α tem sua temperatura de transição reduzida de 175°C bem como sua entalpia de transição, de 16,0 J/g para 7,0 J/g. Esse efeito é causado pela introdução de íon K+, presente na casca de arroz, na estrutura da sílica. O processamento empregado nessa conversão usa equipamentos normalm

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4

Silva, Leila Maria Sotocorno e. "Utilização de areia descartada de fundição e resíduos inorgânicos de indústria de papel e celulose – grits e lama de cal – na produção de materiais vitrocerâmicos /." Presidente Prudente, 2019. http://hdl.handle.net/11449/192704.

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Orientador: Sílvio Rainho Teixeira<br>Resumo: A falta de sincronismo entre o desenvolvimento industrial e a conscientização ambiental trouxe inúmeros impactos adversos ao meio ambiente. A quantidade de resíduos industriais gerados diariamente aumenta, enquanto a adoção de sistemas de gerenciamento ainda falha em muitos aspectos. Assim, o objetivo principal deste trabalho é desenvolver materiais vitrocerâmicos através da mistura de Areia Descartada de Fundição (ADF) com resíduos sólidos oriundos da indústria de papel e celulose (grits e lama de cal), visando o desenvolvimento de novos produtos

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5

Sun, Tawei. "Effects of solid solution on the high-low inversion of cristobalite and the stabilization of high cristobalite." Diss., Virginia Polytechnic Institute and State University, 1989. http://hdl.handle.net/10919/54793.

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The inversion temperature of cristobalite was investigated by incorporating TiO₂, AlPO₄, and BPO₄ into the cristobalite phase using solid state reactions. The combination of TiO₂ and AlPO₄ proved to be most effective in lowering the inversion temperature of cristobalite. Phase diagrams at the high silica corner were constructed for the respective systems. High cristobalite was stabilized for compositions prepared from the CaO-Al2₂O₃-SiO₂ and CuO-Al₂O₃-SiO₂ system using sol-gel processing. The stabilization mechanism is attributed to the surface energy effect resulting from the formation of fin

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6

Swainson, Ian Peter. "The phase transition and dynamic disorder in cristobalite." Thesis, University of Cambridge, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.281903.

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7

Damby, David Ernest. "From dome to disease : the respiratory toxicity of volcanic cristobalite." Thesis, Durham University, 2012. http://etheses.dur.ac.uk/7328/.

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Exposure to fine-grained volcanic ash can potentially cause acute and chronic respiratory disease. The toxicity of ash is likely to vary depending on the type and style of eruption; eruptions at dome-forming volcanoes, in particular, can produce ash containing substantial quantities of respirable crystalline silica, a recognised human carcinogen and causative agent of silicosis. Volcanic domes crystallise crystalline silica as cristobalite, which is metastable at dome-forming temperatures (ca. 850 °C), through deposition from silica-saturated vapours and through devitrification of volcanic gla

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8

Doyle, Kathryn. "Stabilization of β-cristobalite in the SiO2-AlPO4-BPO4 system". Wright State University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=wright1610107429523976.

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9

Guibovich, Pérez Pedro M. "Cristobal de Albornoz y el Taki Onqoy." Pontificia Universidad Católica del Perú, 2014. http://repositorio.pucp.edu.pe/index/handle/123456789/121773.

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10

Dominguez, Christian. "Integrated hydrogeological study of San Cristobal Island (Galapagos)." Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066225/document.

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La compréhension du cycle de l'eau d'une région où les ressources en eau sont limitées est fondamentale pour assurer une gestion durable de celles-ci, c'est le cas de Galápagos. Cette thèse présente la première étude intégrée du fonctionnement hydrogéologique des aquifères perché de l'île San Cristóbal. Pour ce faire, une approche pluridisciplinaire, fondée sur la mise en place d'un site expérimental sur le bassin versant de Cerro Gato (CG), a été conduite. Pour quantifier les entrées d'eau dans le système hydrologique une approche canopée-transfert hydrique du sol a été utilise. La recharge e

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11

Zhao, Hui. "Calculations of the elastic constants of crystals as functions of pressure with applications to quartz and cristobalite." Thesis, This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-07112009-040508/.

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12

Arasa, Cid Carina. "Procesos químicos con oxigeno y nitrógeno sobre beta-cristobalita: estudio teórico desde primeros principios." Doctoral thesis, Universitat de Barcelona, 2007. http://hdl.handle.net/10803/2757.

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El objetivo principal de esta tesis es el estudio de los procesos fisico-químicos que tienen lugar en las interfases gas-superficie sólida, partiendo desde primeros principios y haciendo un estudio de estructura electrónica, dinámico y cinético de los mismos.<br/>En particular, se pretende hacer un estudio teórico de algunas de las reacciones producidas en las superficies de los vehículos espaciales durante su reentrada en la atmósfera de la Tierra (78% N2, 21% O2, y 1% Ar). Estos vehículos llegan a velocidades de entre 22 y 30 veces la velocidad del sonido, con temperaturas que oscilan entre

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13

Colbeau-Justin, Christophe. "Cristallochimie et proprietes non lineaires de nouveaux composes a structures cristobalite et tridymite deformees." Paris 6, 1996. http://www.theses.fr/1996PA066768.

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L'objectif de ce travail est l'elaboration et la caracterisation de nouveaux materiaux susceptibles de presenter des proprietes non lineaires. La synthese et la mise en evidence de neuf nouvelles phases ont ete realisees. Les composes de type a#2bxo#4 cristallisent selon une structure de type cristobalite et les composes abxo#4 selon une structure de type tridymite. Des methodes de cristallogenese telles que la croissance en flux et la synthese hydrothermale ont permis d'obtenir des monocristaux des composes kznaso#4 et tigageo#4 dont les structures ont ete determinees. Les structures des comp

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14

Castillo, Ameyali Ramos. "Water governance in San Cristobal de las Casas, Chiapas, Mexico." Thesis, University of Oxford, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.550571.

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Through a case study of the city of San Cristobal de las Casas, Chiapas, Mexico, this dissertation queries the relevance of current water governance frameworks to cities in the global south and brings to light a major mismatch between official water governance policies and the realities of cities in the global South. Drawing on a diversity of methodological tools and theoretical approaches, this dissertation demonstrates that current water governance approaches - be them state- based, market driven, or participatory - have systematically failed because they are based on assumptions of socio-po

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15

Černok, Ana [Verfasser], and Leonid [Akademischer Betreuer] Dubrovinsky. "Diversity of compressional mechanisms among SiO2 polymorphs : case of coesite and cristobalite / Ana Cernok. Betreuer: Leonid Dubrovinsky." Bayreuth : Universität Bayreuth, 2015. http://d-nb.info/1081718102/34.

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16

Cope, Elizabeth Ruth. "Dynamic properties of materials : phonons from neutron scattering." Thesis, University of Cambridge, 2010. https://www.repository.cam.ac.uk/handle/1810/226116.

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A detailed understanding of fundamental material properties can be obtained through the study of atomic vibrations, performed experimentally with neutron scattering techniques and coupled with the two powerful new computational methodologies I have developed. The first approach involves phonon-based simulations of the pair distribution function - a histogram of localised atomic positions generated experimentally from total scattering data. This is used to reveal ordering behaviour, to validate interatomic models and localised structure, and to give insights into how far dynamic behaviour can b

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17

Nattrass, Claire. "The crystalline silica conundrum : the effect of impurities on the respiratory toxicity of diatomaceous earth and synthetic cristobalite." Thesis, Durham University, 2015. http://etheses.dur.ac.uk/11257/.

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Crystalline silica, in the form of quartz and cristobalite, can cause respiratory diseases, such as silicosis. However, the observed toxicity and pathogenicity of crystalline silica is highly variable. This has been attributed to a number of inherent and external factors, including the presence of impurities that can react with the silica surface. Substitutions of aluminium (Al) for silicon in volcanic cristobalite, and phases occluding its surface, have been hypothesised to decrease its reactivity. Diatomaceous earth (DE), an industrial source of cristobalite exposure, is studied to determine

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18

Whitbeck, Douglas Craig. "Mapping of Sonoran Desert vegetation communities of San Cristobal Valley and southern Sentinel Plains, Barry M. Goldwater Range and variables influencing route proliferation in the Barry M. Goldwater Range's San Cristobal Valley." Thesis, The University of Arizona, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=1544892.

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<p> The vegetation associations in the Eastern San Cristobal Valley of Barry M. Goldwater Range-East (BMGR) were mapped using a combination of field surveys (relevés) and interpretation of aerial imagery in order to contribute to ongoing mapping efforts of Barry M. Goldwater Range -East. Throughout the San Cristobal Valley, 149 relevé samples were collected to characterize the vegetation associations. Seventeen vegetation associations were identified and mapped, including a new <i>Larrea tridentata/Ambrosia dumosa/Grusonia kunzei</i> (Creosote bush-White bursage-Devil's cholla) a

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Yang, Quan. "Molecular dynamics simulation of penetrant transport in composite poly (4-methyl-2-pentyne) and nanoparticles of different types." Diss., Virginia Tech, 2013. http://hdl.handle.net/10919/24521.

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Membranes made of composite polymer material are widely employed to separate gas mixtures in industrial processes. These membranes have better performance than membranes consisting of polymer alone. To understand the mechanism and therefore aid membrane design it is essential to explore the penetrant transport in the complex composites from the molecular level, but few researchers have done such research to our knowledge. Herein the penetrant transport in the composite Poly (4-methyl-2-pentyne) (PMP) and silica nanoparticle is being explored with molecular dynamics (MD) simulations. The struc

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20

Parsons, Zachary David. "CAUSE SPECIFIC MORTALITY OF DESERT BIGHORN SHEEP LAMBS IN THE FRA CRISTOBAL MOUNTAINS, NEW MEXICO, USA." The University of Montana, 2008. http://etd.lib.umt.edu/theses/available/etd-12172007-115521/.

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Desert bighorn sheep (Ovis canadensis mexicana) are an endangered species in New Mexico. Many of the small, isolated populations of desert bighorn are declining, and factors affecting their growth rates include low lamb recruitment and high mortality of adults due to cougar predation. No one has previously reported cause-specific mortality rates for desert bighorn lambs. My objectives were to determine the causes, extent, and timing of lamb mortality in the Fra Cristobal Mountains, New Mexico, USA. I tested 3 capture techniques during 2001 and 2002: approaching lambs on foot and restraining th

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21

Salazar, Nava Diana. "Análisis de la segregación socioespacial en el municipio de Huixquilucan, Caso: Localidad de San Cristobal Texcalucan." Tesis de Licenciatura, Universidad Autónoma del Estado de México, 2013. http://hdl.handle.net/20.500.11799/58579.

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El municipio de Huixquilucan localizado en la porción poniente del Distrito Federal, presentan los niveles de ingreso más altos en el Estado de México 1 , a pesar de ello, existen grandes disparidades internamente. Se halla población, que no disfruta de los elementos que permiten el status de una buena calidad de vida. En contraparte se presenta una desigualdad en los ingresos, diferentes tipos de empleo, educación, salud, vivienda, servicios, transporte entre otros elementos que acentúan la desigualdad dentro del dinamismo del

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22

Dinca, Daniel. "Gold, Landscape, and Economy in Cristobal de Acuña’s Nuevo Descubrimiento del Gran Rio de las Amazonas (1641)." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1440386056.

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23

Godoy, Jr Martin. "Flute Music of Cristóbal Halffter: His Roots in Spanish Tradition and Place in the Avant-Garde Generación del 51." Thesis, University of North Texas, 2020. https://digital.library.unt.edu/ark:/67531/metadc1703350/.

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Cristóbal Halffter, born in 1930, established himself as an important figure in Spanish avant-garde composition in the middle of the twentieth-century. As one of the prominent leaders of the Generación del 51, he helped establish modernity in music as a part of Spain's identity. His compositional style mixing tradition with the avant-garde was built on the success and breakthrough of Manuel de Falla, a composer with close ties to Halffter's family and served as a 'father figure' to the Generación del 51. This study begins with a discussion on Falla's work and reception, as he lay the groundwor

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Girardi, Lavin Cristobal Verfasser], and Andreas [Akademischer Betreuer] [Schäffer. "Comparison of the biodegradation of pharmaceuticals and biocides in water and soil systems / Cristobal Girardi Lavin ; Betreuer: Andreas Schäffer." Aachen : Universitätsbibliothek der RWTH Aachen, 2011. http://d-nb.info/1127861492/34.

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25

Cajo, Salazar Rene Luzmila. "Proceso de enseñanza aprendizaje para el desarrollo de la comprensión lectora en la I.E. 10197 San Cristobal Grande-Olmos." Bachelor's thesis, Pontificia Universidad Católica del Perú, 2018. http://tesis.pucp.edu.pe/repositorio/handle/123456789/11656.

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Al terminar los estudios de la Segunda Especialidad en Gestión Escolar con Liderazgo Pedagógico ejecutado por la Pontificia Universidad Católica del Perú, presento el Plan de Acción titulado “PROCESO DE ENSEÑANZA APRENDIZAJE PARA EL DESARROLLO DE LA COMPRENSIÓN LECTORA EN LA I.E 10197 SAN CRISTOBAL GRANDEOLMOS”, lo que moviliza los diferentes procesos dentro de la I.E y ayuda a mejorar la planificación curricular en el marco de una educación de calidad , planificar el monitoreo y acompañamiento a la práctica docente en el aula y promover un clima institucional caracterizado por la equidad y el

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Girardi, Lavin Cristobal [Verfasser], and Andreas [Akademischer Betreuer] Schäffer. "Comparison of the biodegradation of pharmaceuticals and biocides in water and soil systems / Cristobal Girardi Lavin ; Betreuer: Andreas Schäffer." Aachen : Universitätsbibliothek der RWTH Aachen, 2011. http://nbn-resolving.de/urn:nbn:de:hbz:82-opus-38054.

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27

Vabre, Marie-José. "Les récits Nahuas de l'histoire aux XVIe et XVIIe siècles : Cristobal del Castillo : vie et oeuvre : analyse de la description de Huitzilopochtli." Toulouse 2, 1998. http://www.theses.fr/1998TOU20093.

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Andraos, Michel. "Praxis of peace, the pastoral work and theology of Bishop Samuel Ruiz and the Diocese of San Cristobal de Las Casas, Chiapas, Mexico." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ54044.pdf.

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Benzerara, Karim. "Géomicrobiologie de la météorite de Tataouine." Paris 7, 2002. http://www.theses.fr/2002PA077021.

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30

Shepherd, Ashley Lauren. "Mapping of Sonoran Desert Vegetation Communities and Spatial Distribution Differences of Larrea Tridentata Seed Density in Relation to Ambrosia Dumosa and Ambrosia Deltoidea, San Cristobal Valley, Arizona." Thesis, The University of Arizona, 2011. http://hdl.handle.net/10150/217053.

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Vegetation in the San Cristobal Valley of Barry M. Goldwater Range-East was mapped using a combination of field surveys and aerial imagery interpretation to contribute to ongoing inventory of natural resources for the BMGR-East as well as assist in resource management decisions. Eighteen vegetation associations were identified and mapped through collection of 186 samples to characterize vegetation associations. The most common vegetation association was Larrea tridentata monotype, covering 29% of the area mapped. Larrea tridentata is a widely spread shrub throughout the Sonoran, Chihuahuan and

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García, Chiang Armando. "Le christianisme de la libération au Mexique." Paris, EHESS, 2002. http://www.theses.fr/2002EHES0045.

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32

Yung-WeiTsai та 蔡永偉. "The Study on Mullite Synthesis Using Submicrometric Cristobalite-α-Al2O3 Powders". Thesis, 2014. http://ndltd.ncl.edu.tw/handle/nef5q5.

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碩士<br>國立成功大學<br>資源工程學系<br>102<br>Particle size effects of starting materials on mullite formation in the α-Al2O3/cristobalite powder systems was examined. α-Al2O3 and cristobalite powders with D50 values of 200, 300, and 400 nm were mixed in a stoichiometric composition of 3Al2O3∙2SiO2 (71.8 wt% α-Al2O3 and 28.2 wt% SiO2) as starting powder systems. Differential thermal analysis (DTA), X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and transmission electron microscopy (TEM) techniques were used in this study. The results showed that mu

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Schweizer, Federico Rodolfo 1970. "Cristobal Lozano's ideology in Soledades de la vida y desengaños del mundo." 2007. http://hdl.handle.net/2152/16021.

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This work analyzes Cristobal Lozano's (1609-2667) novel: Soledades de la Vida y Desengaños del Mundo (1658) as a representative work of the author's moralizing ideology related to the Counter Reformation. Lozano was one of the most popular writers in Spain during the second part of the seventeenth century. Today, this writer is almost forgotten and finding the majority of his works is becoming difficult. Part of this dissertation, addresses this issue by locating a large section of his literary work, something that has not been done since the beginning of the twentieth century. Another importa

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Berg, Ginna. "Zapaturismo in San Cristobal de las Casas, Mexico: marketplace capitalism meets revolutionary tourism." 2008. http://hdl.handle.net/1993/3071.

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The EZLN (Ejercito Zapatista de Liberacion Nacional) resistance in Chiapas, Mexico remade the image of San Cristobal, from a quaint tourist destination, to a location of adventure and social revolution. The Zapatista, and their ideas of Zapatismo, according to some North American social activists, was a keystone movement facing off against the pressures of neo-liberal capitalism. One of the most notable contributions has been the stimulation of an overwhelming rise in international solidarity actors to the area. These factors along with a proximity to popular Maya archaeological sites, a high

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Τσουκαλά, Βασιλική. "Μελέτη μετατροπής τέφρας φλοιού ρυζιού σε συνθετικούς ζεόλιθους". Thesis, 2012. http://hdl.handle.net/10889/5837.

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Η Τέφρα Φλοιού Ρυζιού (ΤΦΡ) είναι ένα από τα κυριότερα γεωργικά απόβλητα και προέρχεται από την καύση του φλοιού ρυζιού (ΦΡ) στις ορυζοβιομηχανίες για παραγωγή ενέργειας ή και μείωσης του όγκου των αποβλήτων. Η τέφρα φλοιού ρυζιού αποτελεί περίπου το 18-20% του φλοιού του ρυζιού, ο οποίος αποτελεί περίπου το 20% του ακατέργαστου ρυζιού ενώ συνήθως είναι κρυσταλλική. Καθώς ο παγκόσμιος όγκος της ετήσιας παραγωγής σε ρύζι και κατ’ επέκταση σε τέφρα φλοιού ρυζιού αυξάνεται διαρκώς, εγείροντας περιβαλλοντικά και οικονομικά ζητήματα, η ανεύρεση ενός αποδοτικού και οικολογικού τρόπου εκμετάλλευσης

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Canas, Cuevas Sandra. "Entre pueblo mágico y ciudad multicultural : ciudadanías diversas en la Periferia Urbana de San Cristóbal de Las Casas, Chiapas = Between enchanted town and multicultural city : citizenship formations among the Mayas in San Cristobal de Las Casas, Chiapas, Mexico." Thesis, 2014. http://hdl.handle.net/2152/26862.

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This dissertation is an ethnographic analysis of state led multiculturalism and its impacts on indigenous people in the former colonial city of San Cristobal de Las Casas in Southern Mexico. Based on an eighteen-month period of fieldwork, it examines how the colonial order is being redeployed in the urban space through multicultural programs that seek to govern indigenous people. In particular, it discusses how indigenous people are transformed into multicultural citizens and their lands into natural reserves. In showing how indigenous people are being produced as citizens and governed through

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Součková, Kristina. "Mayská kultura v perspektivě antropologie turismu." Doctoral thesis, 2017. http://www.nusl.cz/ntk/nusl-372345.

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My thesis is based on a broader context of theories and categories of tourism and touristic experiences elaborated by authors belonging to a comparatively new subdiscipline of social and cultural anthropology - the anthropology of tourism. I focus on Mexico, the area of my interest and a part of el Mundo Maya (Maya World) through the eyes of tourism categorization of Valene Smith (1989). I specify two distinct (but yet similar) anthropological fields - one being Riviera Maya with fieldwork in Cancún, Tulum and Chichén Itzá and the other one Ruta Maya with fieldwork in San Cristobal de las Casa

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