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Dissertations / Theses on the topic 'Ash clouds'

Author: Grafiati

Published: 11 December 2022

Last updated: 31 July 2025

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1

Watson, Elizabeth Jane. "Using cryptotephra layers to understand volcanic ash clouds." Thesis, University of Leeds, 2016. http://etheses.whiterose.ac.uk/13386/.

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The aim of this thesis is to evaluate the use of microscopic volcanic ash (‘cryptotephra’) layers for providing information on the timing, characteristics and spatial extent of past volcanic ash clouds. The fine ash produced by explosive eruptions can travel long distances and even in low concentrations represents a hazard for aviation. Understanding the frequency and nature of ash clouds is important if economic and social losses are to be mitigated. This thesis is split into two research compartments. Compartment 1 focusses on understanding the limits of tephrochronology and investigates cry

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2

Poret, Matthieu <1989&gt. "Modelling ash cloud dispersion and the impact of ash aggregation during volcanic eruptions." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amsdottorato.unibo.it/8633/1/Poret_Matthieu_Tesi_Revised.pdf.

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Improvements for characterizing eruption processes are made commonly through field or remote-sensing measurements, lab experiments and numerical models. However, the main volcanological parameters inter-dependency makes challenging the assessment of tephra dispersion and sedimentation, from which mass eruption rate, total erupted mass, and Total Grain-Size Distribution (TGSD) are typically estimated. This thesis aims at better constraining Eruption Source Parameters (ESP) and in particular the TGSD, usually derived from field sample analysis. The estimation of very fine ash (i.e. < 30 μm) frac

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3

Skoglund, Eric. "Recent Icelandic Tephra in a Swedish Peat Deposit." Thesis, Stockholms universitet, Institutionen för naturgeografi och kvartärgeologi (INK), 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-79134.

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Two eruptions from Icelandic volcanoes have in the last years caused widespread dispersalof volcanic ash in the atmosphere. The transportation of tephra from Iceland to mainlandEurope is not an uncommon event and it can cause large disruptions to society. In thisthesis I present the ndings of a tephrochronological study of recent sediment from a bogcalled Trolls mosse in southern Sweden. The results show the presence of recent tephrafrom what is most likely the Grímsvötn eruption in May 2011, but geochemical analysisof the tephra could not conrm the exact origin of it, and a possibility that t

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4

Klimt, Roman. "Informační systémy v éře cloud computingu." Master's thesis, Vysoká škola ekonomická v Praze, 2011. http://www.nusl.cz/ntk/nusl-124798.

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This thesis is focused on cloud computing and its impact on enterprise resource planning information systems. The historical background of cloud computing is discussed in the first of the thesis. After that, analysis of all possible services and types of cloud computing are provided. In this first part of this thesis, there is also an analysis of cloud computing providers who provide one of the possible cloud computing service - Infrastructure as a Service(IaaS). This thesis evaluates IaaS providers based on suggested methodology. According to this methodology each provider is ranked and the p

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5

Gueugneau, Valentin. "Etude de la formation et de la mise en place des déferlantes pyroclastiques par modélisations numérique et expérimentale." Thesis, Université Clermont Auvergne‎ (2017-2020), 2018. http://www.theses.fr/2018CLFAC050/document.

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Les écoulements pyroclastiques sont des écoulements volcaniques complexes dont le comportement physique fait encore l'objet de débats. Ils sont composés de deux parties : l'écoulement dense basal, riche en particules et en blocs, surmonté par la déferlante, diluée et turbulente. Les interactions entre ces deux parties ne sont pas bien comprises, tout comme leurs échanges de masses et de quantités de mouvement. Partant de ce constat, cette thèse se concentre sur l’étude des mécanismes de formation de la déferlante à partir de l’écoulement dense.Les expériences mettent en évidence un mécanisme d

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6

Hammar, Karl. "Orders From the Cloud : Business Integration as a Service." Thesis, Jönköping University, JIBS, Business Informatics, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-10159.

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<p>This thesis describes the development of a SOA-based architecture for integrating large EDI-using manufacturing companies purchasing processes with smaller non-EDI capable manufacturing companies, using online services.</p><p>The underlying need for this project lies with the fact that these small manufacturing companies risk to miss out on business, due to their inability to communicate via the industry standard EDI format. At the same time, getting EDI-capable involves significant investments in software licenses, connectivity services and consulting or training that these small companies

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7

Šapovalov, Tomáš. "Budoucnost outsourcingu IT v době SaaS." Master's thesis, Vysoká škola ekonomická v Praze, 2011. http://www.nusl.cz/ntk/nusl-85131.

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Information technologies develop very quickly. And in the same way should be changed the companie's attitude to them. But the question is whether this is actually happening. If the companies and their employees are able to adapt to new technologies as quickly as these technologies arise. One of the phenomena of recent years is delivering applications through Software As A Service (SaaS). This concept is closely linked with the issue of Cloud computing and its use can be solved by outsourcing corporate IT structure. So here we meet three very exposed concepts. But their terms are often used con

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8

Jurica, Martin. "SaaS ve firemním ICT - důsledky, změny, příležitosti." Master's thesis, Vysoká škola ekonomická v Praze, 2011. http://www.nusl.cz/ntk/nusl-72606.

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This thesis is focused on analyzing the current state of SaaS (Software as a Service) and impact of SaaS on corporate's ICT as a whole. The aim is to explain the concepts and implications of modern forms of providing services, to describe and to evaluate their benefits and risks and to assess future developments in this area. The attention will be paid on specifics of the environment of Czech companies. The first part of this work deals with the current SaaS solutions and related technologies. Emphasis is placed on acquainting the reader with currently available (or introduced by mid-2011) tec

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9

ZUCCHETTI, FIONA. "Transposon based technology in DHFR knockout CHO cell line improves generation of AMH high producing clones for industrial applications." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2018. http://hdl.handle.net/10281/198952.

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In ricerca ed in applicazione industriale la richiesta di proteine ricombinanti è in continua crescita; vengono investite sempre più risorse per sviluppare un sistema efficace in grado di ottenere un’elevata espressione proteica.Le cellule di mammifero sono l’ospite di elezione per lo sviluppo di proteine ricombinanti in quanto ne garantiscono la qualità.Linee cellulari CHO deficitarie dell’enzima diidrofolato reduttasi(DHFR) sono molto diffuse come sistema di espressione.In tali linee, il DHFR, un enzima essenziale coinvolto nella sintesi di purine, viene sfruttato come marker di selezione. È

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10

Waak, Elisabet. "Listeria monocytogenes : farm and dairy studies /." Uppsala : Dept. of Food Hygiene, Swedish Univ. of Agricultural Sciences ([Institutionen för livsmedelshygien], Sveriges lantbruksuniv.), 2002. http://epsilon.slu.se/avh/2002/91-576-6376-9.pdf.

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11

Rosvall, Ola. "Enhancing gain from long-term forest tree breeding while conserving genetic diversity /." Umeå : Swedish Univ. of Agricultural Sciences (Sveriges lantbruksuniv.), 1999. http://epsilon.slu.se/avh/1999/91-576-5643-6.pdf.

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12

Soukop, Robin. "Vliv vulkanického popela na leteckou dopravu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2012. http://www.nusl.cz/ntk/nusl-230173.

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This master's thesis deals with the issue of volcanic ash as a complex and its impact on aviation, including the volcanic activity itself (conditions for its existence, for existence of eruptions and their basic products). In addition, the thesis also deals with effect of volcanic ash on aircraft and airports, possibilities of its detection or monitoring as well as mechanism of its spreading in airspace. The emphasis is laid mainly on air incidents related to volcanic ash and on danger it poses to the airspace of the Czech Republic.

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13

Bhattacharya, Sankar Prasad. "The radiative properties and thermal effects of ash clouds and deposits in pulverised fuel fired furnaces." Thesis, 1995. http://hdl.handle.net/1959.13/1312419.

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Research Doctorate - Doctor of Philosophy (PhD)<br>A theoretical and experimental study was undertaken on the radiative properties of solids suspended in furnace gases and those of the solid deposits formed on the furnace wall during pulverised coal combustion. Experiments included measurement of the absorption indices of coal, char, ash and slag particles, and the emittance of their deposits, both real time and ex-situ, to assess the effects of particle size, physical state, iron and unburnt carbon (UC), devolatilisation and heating. Theoretical studies included formulation of mathematical mo

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14

Malmo, Francesco. "INITIAL ISSUES ABOUT AUTOMATIC PLATFORM TO MONITOR REAL TIME AIRCRAFT POSITION RESPECT TO VOLCANIC ASH OR DESERT SAND CLOUDS." Tesi di dottorato, 2015. http://www.fedoa.unina.it/10551/1/Malmo-TesiDottorato2015.pdf.

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The safety problem which can arise when a plane encounters volcanic ash or desert sand clouds is discussed. The main aim of Ph.D. dissertation is to explain fundamental principles of a new automatic IT platform, which can monitor real time the presence of volcanic ash or desert sand clouds in the airspace around each airplane; so, this system will increase safety of flights, above all ensuring two very important advantages: - it will allow flight crews to fly avoiding encounters with volcanic ash or desert sand clouds, which represent a severe risk of disaster; - it will allow air-traffic cont

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15

Richards, Michael S. "Volcanic ash cloud heights using the MODIS CO₂-slicing algorithm." 2006. http://catalog.hathitrust.org/api/volumes/oclc/66388089.html.

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Thesis (M.S.)--University of Wisconsin--Madison, 2006.<br>Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 82-87).

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16

Agrillo, Giuseppe. "Weather predictions at high spatial resolutions for a volcanic ash cloud tracking system." Tesi di dottorato, 2014. http://www.fedoa.unina.it/10023/1/GiuseppeAgrillo_PhD_thesis-1.4.pdf.

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The CCMMMA (Centro Campano per il Monitoraggio e la Modellistica Marina ed Atmosferica) is the marine weather center of the University of Naples “Parthenope” and its purpose is expose multi-disciplinary services for the environmental monitoring, produce weather, marine and air quality forecast for Europe, Italy and Campania region (southern Italy) at as high as possible spatial resolution. The weather data of CCMMMA has been used to customize a prototype system focused on volcanoes of southern Italy that allows the on-demand forecast of ash cloud dispersion. The aim is to deploy a workflow of

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