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Dissertations / Theses on the topic 'Fragmentation secondaire'

Author: Grafiati

Published: 8 June 2024

Last updated: 31 July 2025

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1

Crawley, George. "Granulométrie des suspensions de particules fines par mesures turbidimétriques spectrales. Application à l'étude de la fragmentation des cristaux dans une cuve agitée." Phd thesis, Ecole Nationale Supérieure des Mines de Saint-Etienne, 1994. http://tel.archives-ouvertes.fr/tel-00843935.

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Les propriétés physiques, chimiques, mécaniques et rhéologiques des matériaux pulvérulents dépendent de manière notable de leur état granulaire. Ceci justifie la multiplicité des techniques granulométriques. Du fait de leur conception et de leur technologie, la plupart de ces techniques requièrent une préparation ou un prélèvement qui peuvent altérer l'état granulaire de l'échantillon. Une sonde granulométrique utilisable <i>in situ</i> présente donc un intérêt majeur, autant pour caractériser et contrôler en continu un procédé que pour obtenir des informations sur un mécanisme. C'est dans ce

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2

Liu, Yubo. "Characterisation of block cave mining secondary fragmentation." Thesis, University of British Columbia, 2016. http://hdl.handle.net/2429/58516.

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Block cave mining is a widely employed mining method around the world due to its low operating cost. One of the key factors that affects block caving mine’s productivity is fragmentation; accordingly, significant efforts have been made and are currently being made to study fragmentation processes, including the use of numerical modelling and remote sensing techniques. It is desirable to develop fragmentation models that could be used to provide reliable estimates of the range and distribution of the sizes of the rock blocks expected to be induced by caving. In the context of block and panel ca

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3

Wei, Linkai. "Development of a new steam explosion model for the MC3D software." Electronic Thesis or Diss., Université de Lorraine, 2023. http://www.theses.fr/2023LORR0097.

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L'explosion de vapeur est l'un des phénomènes les plus critiques et complexes qui peuvent se produire lors d'un accident grave dans une centrale nucléaire. Le code MC3D est reconnu comme une référence pour l'évaluation de ce phénomène. Ce phénomène explosif est analogue à une détonation. L'explosion est due à la fragmentation du combustible fondu, au passage de l'onde de choc et à la libération très rapide de l'énergie associée. Cependant, les mécanismes précis du processus de pressurisation sont très incertains et ont fait l'objet de travaux réalisés dans le cadre du programme RSNR-ICE (2014-

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4

Nguyen, Thong T. (Trieu Thong) 1963 Carleton University Dissertation Computer Science. "Creepy: an incremental secondary storage garbage collector." Ottawa.:, 1989.

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5

Gómez, Puigpinos René Esteban. "Experimental Assessment of hang up and secondary fragmentation for block caving." Tesis, Universidad de Chile, 2015. http://repositorio.uchile.cl/handle/2250/137096.

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Magíster en Minería<br>En minería es cada vez más recurrente el desarrollo de operaciones a mayores profundidades. En particular, en la minería subterránea masiva explotada por el método de Block/Panel caving esto genera como consecuencia grandes alturas de columna de material quebrado, desarrollando altos esfuerzos producto de la sobrecarga. Es así que surge la presente investigación, con el propósito de estudiar el impacto de mayores esfuerzos en la extracción y fragmentación del mineral El estudio se centra en dos áreas de interés: la fragmentación secundaria y los eventos de colgadura. E

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6

Henriquet, Pierre. "Étude de l’émission de particules chargées secondaires dans l’optique d’un monitorage faisceau et de la dosimétrie en ligne en hadronthérapie." Thesis, Lyon 1, 2011. http://www.theses.fr/2011LYO10111/document.

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Ce travail est consacré à l'étude de faisabilité d'une imagerie par reconstruction de vertex (IRV) pour le contrôle qualité en temps réel de la thérapie par faisceau d'ions carbone. La détection de vertex d'interactions nucléaires repose sur la détection de particules secondaires : grâce à un dispositif de détection spatiale des fragments chargés (tracker), on peut reconstruire les trajectoires des particules émergeant du patient et les extrapoler jusqu'à leur point d'origine (le vertex)... Dans le cadre de notre étude, la position du vertex est déterminée de deux manières différentes : soit e

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7

Dorador, Leonardo. "Experimental investigation of the effect of broken ore properties on secondary fragmentation during block caving." Thesis, University of British Columbia, 2016. http://hdl.handle.net/2429/59392.

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Block cave mining is experiencing a global growth in importance as new large, lower grade and deeper ore bodies favouring underground mass mining methods are developed. With block caving, the rock mass fragmentation process is decisive in the design and success of the operation. The last stage of this fragmentation process known as secondary fragmentation, plays a major role in the design and success of a caving operation. Despite this, it is the least understood fragmentation stage due in part to the complex mechanisms and the numerous variables involved in this phenomenon. The broken ore den

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8

Svensson, Ofir. "Does small-scale land use affect the understory birds negative in the Peruvian National Reserve Allpahuayo Mishana?" Thesis, Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-25017.

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Human activities that lead to fragmentation and habitat loss are big problems in the world. Due to global climate change the negative effects of fragmented habitats can be catastrophic for many organisms. In the Amazon rainforest, that is most sensitive to human impact, stands a big risk to lose its species diversity. Fragmentation and climate change together seems to escalate the death rate of rainforest plants and that will change the whole ecosystem. Birds and insects are depending on the trees and the trees faces big challenges now. Many of the rainforest organisms have been noticed to emi

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9

Noda, Margareth. "Fragmentação do mercado secundário: desafios para a regulação do Brasil." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/2/2132/tde-17122015-105852/.

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O mercado de capitais, e especialmente o mercado secundário, está entre os setores da economia que reagem mais prontamente às inovações tecnológicas. Nos últimos anos, o desenvolvimento tecnológico e das telecomunicações alterou dramaticamente a configuração do mercado secundário: os pregões viva-voz desapareceram, dando lugar aos sistemas eletrônicos de negociação que executam negócios a velocidades imperceptíveis ao ser humano. Concomitantemente, alterações regulatórias visando ao aumento da concorrência nos mercados secundários proporcionaram a criação de ambientes de negociação com e sem t

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10

Yakambram, P. "Synthetic studies toward peloruside a, clavosolides and temperature dependent isomerisation versus net fragmentation of secondary allylic alcohols with grubbs’ catalyst." Thesis(Ph.D.), CSIR-National Chemical Laboratory, Pune, 2006. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/2502.

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11

Henriquet, Pierre. "Etude de l'émission de particules chargées secondaires dans l'optique d'un monitorage faisceau et de la dosimétrie en ligne en hadronthérapie." Phd thesis, Université Claude Bernard - Lyon I, 2011. http://tel.archives-ouvertes.fr/tel-00712778.

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Ce travail est consacré à l'étude de faisabilité d'une imagerie par reconstruction de vertex (IRV) pour le contrôle qualité en temps réel de la thérapie par faisceau d'ions carbone. La détection de vertex d'interactions nucléaires repose sur la détection de particules secondaires : grâce à un dispositif de détection spatiale des fragments chargés (tracker), on peut reconstruire les trajectoires des particules émergeant du patient et les extrapoler jusqu'à leur point d'origine (le vertex)... Dans le cadre de notre étude, la position du vertex est déterminée de deux manières différentes : soit e

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12

Stangler, Eva [Verfasser], and Ingolf [Gutachter] Steffan-Dewenter. "Effects of habitat fragmentation on trap-nesting bees, wasps and their natural enemies in small secondary rainforest fragments in Costa Rica / Eva Stangler ; Gutachter: Ingolf Steffan-Dewenter." Würzburg : Universität Würzburg, 2015. http://d-nb.info/1128074370/34.

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13

SILVA, Lucineia Avelino da. "Florística e fitossociologia de um remanescente urbano de floresta atlântica em regeneração e a resposta da diversidade funcional aos atributos florais em fragmentos florestais urbanos da Região Metropolitana do Recife." Universidade Federal de Pernambuco, 2015. https://repositorio.ufpe.br/handle/123456789/16549.

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Submitted by Fabio Sobreira Campos da Costa (fabio.sobreira@ufpe.br) on 2016-04-13T14:28:14Z No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Versão definitiva dissertação.pdf: 2215795 bytes, checksum: 6ae1c11599069fa2b9b187adf1935e10 (MD5)<br>Made available in DSpace on 2016-04-13T14:28:15Z (GMT). No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Versão definitiva dissertação.pdf: 2215795 bytes, checksum: 6ae1c11599069fa2b9b187adf1935e10 (MD5) Previous issue date: 2015-08-27<br>CNPq<br>A maioria

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14

Bryant, Litticia M. "Cryptic diversity and evolutionary relationships among Australian closed-forest Melomys (Rodentia: Muridae) and related Australo-Papuan mosaic-tailed rats." Thesis, Queensland University of Technology, 2013. https://eprints.qut.edu.au/60846/1/Litticia_Bryant_Thesis.pdf.

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This thesis investigates patterns of evolution in a group of native Australo-Papuan rodents. Past climatic change and associated sea level fluctuations, and fragmentation of wet forests in eastern Australia has facilitated rapid radiation, diversification and speciation in this group. This study adds to our understanding of the evolution of Australia’s rainforest fauna and describes the evolutionary relationships of a new genus of Australian rodent.

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15

Couldrick, C. A. "A systems approach to the design of personal armour for explosive ordnance disposal." Thesis, Cranfield University, 2004. http://hdl.handle.net/1826/828.

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A qualitative description of the personal armour design system is elicited by comparing armour throughout the ages. Inputs that 'shape' designs are the materials technology, threat, wearer, task and environment. The emergent properties of protection, ergonomic effectiveness and financial cost form the basis of trade-offs to select final solutions. Work on the protection subsystem refines the key positive emergent property of personal armour. Existing quantifications of protection effectiveness are rejected in favour of a novel measure named the Usefulness Factor, UF. This is the first measure

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16

Couldrick, Christopher A. "A systems approach to the design of personal armour for explosive ordnance disposal." Thesis, Cranfield University, 2004. http://dspace.lib.cranfield.ac.uk/handle/1826/828.

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A qualitative description of the personal armour design system is elicited by comparing armour throughout the ages. Inputs that 'shape' designs are the materials technology, threat, wearer, task and environment. The emergent properties of protection, ergonomic effectiveness and financial cost form the basis of trade-offs to select final solutions. Work on the protection subsystem refines the key positive emergent property of personal armour. Existing quantifications of protection effectiveness are rejected in favour of a novel measure named the Usefulness Factor, UF. This is the first measure

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17

Prill, Nadine. "Effects of environmental change on plant performance and plant-herbivore interactions." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:c58761e9-666c-4b7d-a78a-d70de7f253d4.

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Global environmental change fundamentally affects plants and their interactions with other species, and this has profound impacts on communities and ultimately ecosystems. In order to understand the mechanisms involved, we need to elaborate on the combined effects of different global change drivers on multiple levels of plant organization, including the biochemical level (production of defence compounds), the whole organism, the population, and the plant-herbivore interaction level. This thesis investigates (1) the combined effects of factors related to climate change and habitat fragmentation

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18

Nordkvist, Rickard. "Att begripliggöra det förflutna : En studie av hur åtta historielärare i samtal och planering föreställer sig historieundervisning inriktad mot att motverka fragmentering." Licentiate thesis, Karlstads universitet, Centrum för de samhällsvetenskapliga ämnenas didaktik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-48239.

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Fragmentation refers to the difficulties that students face when attempting to utilise substantive knowledge to make a useable big picture of the past. What possibilities are there to prevent fragmentation, within the framework of regular history teaching in school? In this thesis I tackle this question with interest in teaching methods proposed by history teachers. The research project is designed with the intention to provide the participating teachers with “reasonably good conditions” to be able to form an opinion about the problem of fragmentation. In the research project the participating

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19

Fu, Tingting. "3D and High Sensitivity Micrometric Mass Spectrometry Imaging." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS218/document.

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L'imagerie par spectrométrie de masse est d’un grand intérêt pour aborder les questions biologiques en fournissant simultanément des informations chimiques et spatiales. En particulier, la spectrométrie de masse baptisée TOF-SIMS est bien reconnue par sa haute résolution spatiale (< 1 μm), qui est essentielle pour révéler l'information chimique dans une zone submicronique. L'emploi croissant de cette technique dans la caractérisation des échantillons biologiques a bénéficié du développement de nouvelles sources d'ions d’agrégats. Cependant, les processus d'ionisation/désorption des analytes

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20

Schuhmann, Imelda. "Aufbau einer HPLC-UV-ESI-MS-MS-Datenbank und ihre Anwendung im Screening arktischer und antarktischer Meeresbakterien." Doctoral thesis, [S.l.] : [s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=977037568.

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21

López-Baucells, Adrià. "Assessment of the effects of forest fragmentation on aerial insectivorous bats in the Amazonian rainforest." Doctoral thesis, 2019. http://hdl.handle.net/10451/42288.

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Land use change and habitat fragmentation are among the most severe threats to biodiversity, especially in the tropics. In the Amazon, the abandonment of formerly deforested areas allowed the expansion of secondary regrowth, a type of habitat where bats are known to provide important ecosystem services. Amongst them, aerial insectivorous bats have been neglected in most Neotropical studies and remain poorly studied. However, the current upsurge in acoustic technology makes them easy targets to be monitored using ultrasound detectors. The aim of this thesis was to reveal the diversity of aerial

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22

Stangler, Eva. "Effects of habitat fragmentation on trap-nesting bees, wasps and their natural enemies in small secondary rainforest fragments in Costa Rica." Doctoral thesis, 2015. https://nbn-resolving.org/urn:nbn:de:bvb:20-opus-108254.

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Summary (English) I. Human induced global change threatens biodiversity and trophic interactions. Fragmentation is considered as one of the major threats to biodiversity and can cause reduced species richness, population declines, loss of genetic diversity and disruption of trophic interactions such as predation and parasitism. However forest fragmentation effects can be eclectic due to species specific traits. Specialist species with narrower niches or at higher trophic levels may be in danger of extinction whereas generalist species with less specific habitat requirements may even profit fro

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23

Prabhakaran, Prasanth. "Moist Rayleigh Benard Convection." Doctoral thesis, 2018. http://hdl.handle.net/11858/00-1735-0000-002E-E4D9-E.

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24

Püttker, Thomas [Verfasser]. "Effects of fragmentation on use of vegetation structures, density, movement patterns and parasite load of selected small mammal species in secondary forest fragments of the coastal Atlantic forest, Brazil / vorgelegt von Thomas Püttker." 2007. http://d-nb.info/985213620/34.

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25

Kormann, Urs Gabriel. "Scale-dependent management of biodiversity and ecosystem processes in fragmented landscapes." Doctoral thesis, 2014. http://hdl.handle.net/11858/00-1735-0000-0023-9639-3.

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