Dissertations / Theses: 'Process migration'

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De, Paoli Damien, and mikewood@deakin edu au. "Multiple strategy process migration." Deakin University. School of Computing and Mathematics, 1996. http://tux.lib.deakin.edu.au./adt-VDU/public/adt-VDU20051110.115628.

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The future of computing lies with distributed systems, i.e. a network of workstations controlled by a modern distributed operating system. By supporting load balancing and parallel execution, the overall performance of a distributed system can be improved dramatically. Process migration, the act of moving a running process from a highly loaded machine to a lightly loaded machine, could be used to support load balancing, parallel execution, reliability etc. This thesis identifies the problems past process migration facilities have had and determines the possible differing strategies that can be used to resolve these problems. The result of this analysis has led to a new design philosophy. This philosophy requires the design of a process migration facility and the design of an operating system to be conducted in parallel. Modern distributed operating systems follow the microkernel and client/server paradigms. Applying these design paradigms, in conjunction with the requirements of both process migration and a distributed operating system, results in a system where each resource is controlled by a separate server process. However, a process is a complex resource composed of simple resources such as data structures, an address space and communication state. For this reason, a process migration facility does not directly migrate the resources of a process. Instead, it requests the appropriate servers to transfer the resources. This novel solution yields a modular, high performance facility that is easy to create, debug and maintain. Furthermore, the design easily incorporates providing multiple migration strategies. In order to verify the validity of this design, a process migration facility was developed and tested within RHODOS (ResearcH Oriented Distributed Operating System). RHODOS is a modern microkernel and client/server based distributed operating system. In RHODOS, a process is composed of at least three separate resources: process state - maintained by a process manager, address space - maintained by a memory manager and communication state - maintained by an InterProcess Communication Manager (IPCM). The RHODOS multiple strategy migration manager utilises the services of the process, memory and IPC Managers to migrate the resources of a process. Performance testing of this facility indicates that this design is as fast or better than existing systems which use faster hardware. Furthermore, by studying the results of the performance test ing, the conditions under which a particular strategy should be employed have been identified. This thesis also addresses heterogeneous process migration. The current trend is to have islands of homogeneous workstations amid a sea of heterogeneity. From this situation and the current literature on the topic, heterogeneous process migration can be seen as too inefficient for general use. Instead, only homogeneous workstations should be used for process migration. This implies a need to locate homogeneous workstations. Entities called traders, which store and disseminate knowledge about the resources of several workstations, should be used to provide resource discovery. Resource discovery will enable the detection of homogeneous workstations to which processes can be migrated.

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佘啓明 and Kai-ming Shea. "Process migration on multiprocessor systems." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1997. http://hub.hku.hk/bib/B31236121.

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Shea, Kai-ming. "Process migration on multiprocessor systems /." Hong Kong : University of Hong Kong, 1997. http://sunzi.lib.hku.hk/hkuto/record.jsp?B18614085.

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Nuttall, Mark Patrick. "Cluster load balancing using process migration." Thesis, Imperial College London, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.267613.

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Wong, Ying-ying, and 王瑩瑩. "Process migration for distributed Java computing." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2009. http://hub.hku.hk/bib/B43085386.

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Lu, Junde. "Model migration based on process similarity /." View abstract or full-text, 2008. http://library.ust.hk/cgi/db/thesis.pl?CBME%202008%20LU.

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Wong, Ying-ying. "Process migration for distributed Java computing." Click to view the E-thesis via HKUTO, 2009. http://sunzi.lib.hku.hk/hkuto/record/B43085386.

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Granebring, Annika. "ERP Migration Structure : an Innovation Process Perspective." Licentiate thesis, Mälardalen University, School of Business, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-81.

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馬家駒 and Ka-kui Ma. "Transparent process migration for parallel Java computing." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2001. http://hub.hku.hk/bib/B31226474.

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Ma, Ka-kui. "Transparent process migration for parallel Java computing /." Hong Kong : University of Hong Kong, 2001. http://sunzi.lib.hku.hk/hkuto/record.jsp?B23589371.

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Ho, Sai-chuen. "Process roaming." Click to view the E-thesis via HKUTO, 2007. http://sunzi.lib.hku.hk/hkuto/record/B38983424.

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Haverinen, J. (Janne). "Adaptation through a Stochastic Evolutionary Neuron Migration Process." Doctoral thesis, University of Oulu, 2004. http://urn.fi/urn:isbn:9514273079.

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Abstract Artificial Life is an interdisciplinary scientific and engineering enterprise investigating the fundamental properties of living systems through the simulation and synthesis of life-like processes in artificial media. One of the avenues of investigation is autonomous robots and agents. Mimicking of the growth and adaptation of a biological neural circuit in an artificial medium is a challenging task owing to our limited knowledge of the complex process taking place in a living organism. By combining several developmental mechanisms, including the chemical, mechanical, genetic, and electrical, researchers have succeeded in developing networks with interesting topology, morphology, and function within Artificial Computational Chemistry. However, most of these approaches still fail to create neural circuits able to solve real problems in perception and robot control. In this thesis a phenomenological developmental model called a Stochastic Evolutionary Neuron Migration Process (SENMP) is proposed. Employing a spatial encoding scheme with lateral interaction of neurons for artificial neural networks, which represent candidate solutions within a neural network ensemble, neurons of the ensemble form problem-specific spatial patterns with the desired dynamics as they migrate under the selective pressure. The approach is applied to gain new insights into development, adaptation and plasticity in neural networks and to evolve purposeful behaviors for mobile robots. In addition, the approach is used to study the relationship of spatial patterns, composed of interacting entities, and their dynamics. The feasibility and advantages of the approach are demonstrated by evolving neural controllers for solving a non-Markovian double pole balancing problem and by evolving controllers that exhibit navigation behavior for simulated and real mobile robots in complex environments. Preliminary results regarding the behavior of the adapting neural network ensemble are also shown and, particularly, a phenomenon exhibiting Hebbian-like dynamics. This thesis is a step toward a long range goal that aims to create an intelligent robot that is capable of learning complex skills and adapts rapidly to environmental changes.

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Smith, Peter W. "The possibilities and limitations of heterogeneous process migration." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/NQ27250.pdf.

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Kant, Rishi. "Silicon migration as a process for micro/nanofabrication /." May be available electronically:, 2009. http://proquest.umi.com/login?COPT=REJTPTU1MTUmSU5UPTAmVkVSPTI=&clientId=12498.

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Nishihara, Yasutaka. "Theoretical Study on Ligand Migration Process of Carboxymyoglobin." 京都大学 (Kyoto University), 2008. http://hdl.handle.net/2433/124376.

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Ho, Sai-chuen, and 何世全. "Process roaming." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2007. http://hub.hku.hk/bib/B38983424.

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Prinz, Vanessa. "Imagine migration the migration process and its destination Europe in the eyes of Tanzanian students /." [Wien] : Südwind-Verlag, 2006. http://catalog.hathitrust.org/api/volumes/oclc/79447612.html.

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Eng, Dennis. "Process evaluation of general data migration guidelines : A comparative study." Thesis, Linköping University, Department of Computer and Information Science, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-57440.

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Information systems form the backbone of many organizations today and are vital for their daily activities. For each day these systems grows bigger and more customized to the point where it is heavily integrated in the current platform. However, eventually the platform grows obsolete and the system itself becomes an obstacle for further development. Then the question arises, how do we upgrade the platform while retaining customizations and data? One answer is data migration which essentially is the process of moving data from one device to another. The problems of data migration becomes evident with extensive and heavily customized systems which effectively lead to the absence of any general guidelines for data migration.This thesis attempts to take a first step in finding and testing a set of general migration guidelines that might facilitate the creation of future migration projects. This is achieved using a comparative analysis of the general migration guidelines contra the process of migrating data between different editions of the Microsoft SharePoint framework. The analysis attempts to find out if the general guidelines are general enough for this migration process and leave it to future research to further assess their generality. This paper will also investigate the importance of using incremental migration and the ability to perform structural change during migration as well as how these issues is handled by the built in migration tool of SharePoint. In the end the general guidelines proved to be sufficient to express the SharePoint migration process and should therefore be used for further research to assess their worth in other projects. In terms of the second issue, the built-in migration tool proved weak in handling either incremental migration nor structural change which is unfortunate due to the benefits these features bring.

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VIANA, LUCIANO DALCOL RODRIGUES. "THE MIGRATION PROCESS THROUGH THE EYE OF THE (IM)MIGRANT." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2016. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=27824@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO
COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
PROGRAMA DE SUPORTE À PÓS-GRADUAÇÃO DE INSTS. DE ENSINO
Esse estudo propõe-se a criar um diálogo entre histórias de vida de (i)migrantes com as principais correntes teóricas explicativas do processo migratório. Além do próprio autor, fomos capazes de coletar outras duas histórias de vidas: a primeira, de uma brasileira que viveu no mesmo período e no mesmo lugar que o autor; e a segunda, de outra brasileira, que viveu nos EUA, mas ainda vive por lá, hoje já com dupla-cidadania. As narrativas foram obtidas por correio eletrônico, através de algumas trocas explicando o objetivo, o objeto e as questões pertinentes para conhecer a história de vida (i)migratória dessas duas voluntárias. A estrutura dessa pesquisa se apoia no movimento migratório enquanto objeto de análise, exemplificado nas histórias de vida (i)migrante coletadas. Através desse método, visualiza-se o processo migratório em sua essência, amparado por outras pesquisas que se aproximam do ambiente vivido pelos (i)migrantes pesquisados, corroborando suas narrativas. Fazemos também um estudo generalizado das principais correntes migratórias, a fim de identificar elementos norteadores, similaridades e disparidades entre as mesmas. Por fim, através dos exemplos coletados, é possível identificar partes das narrativas que se aproximam ora de uma, ora de outra corrente teórica. De fato, nenhuma corrente isoladamente consegue explicar o processo migratório, conferindo à empiria uma proposta que deva ser holística, plural e complexa como a vida e experiência dos (i)migrantes se mostra. Sendo assim, aponta-se para uma utilização mais abrangente dos modelos teóricos existentes, a fim de que reflitam essa complexidade da vida.
This research aims to build a dialogue among life stories (Menezes 1992) of (im)migrants and the main theoretical trends over the migration process. Besides the author himself, we were able to collect two other life stories: the first is a Brazilian woman who shared the migratory experience with the author; the second is another Brazilian woman who still lives in the US, already naturalized American. The narratives were acquired through emails. Information was exchanged regarding the study s objectives, object, and questions regarding the elements of life story methodology. The structure of this study is set on the object of analysis, which is the migration process itself, explained by these (im)migrant life stories. Based on this methodology, it is possible to observe the migration process in essence, supported by other researches that are related or quasi-related to the environment experienced by the (im)migrants interviewed. Additionally, a generalized study of the main studies in migratory theory are produced in order to identify their main questions, similarities, and disparities. In the end, based on the samples collected it is possible to identify parts of the narratives that near one or another theory. In fact, no single theory can explain by itself the complexity of the migratory process. According to the experiences collected, a theoretical proposal must be holistic, plural and complex such as how the lives of the (im)migrants are perceived. Therefore, it is necessary to use a broader theoretical approach in order to reflect such complexity.

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Blumer, Aric David. "Register Transfer Level Simulation Acceleration via Hardware/Software Process Migration." Diss., Virginia Tech, 2007. http://hdl.handle.net/10919/29380.

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The run-time reconfiguration of Field Programmable Gate Arrays (FPGAs) opens new avenues to hardware reuse. Through the use of process migration between hardware and software, an FPGA provides a parallel execution cache. Busy processes can be migrated into hardware-based, parallel processors, and idle processes can be migrated out increasing the utilization of the hardware. The application of hardware/software process migration to the acceleration of Register Transfer Level (RTL) circuit simulation is developed and analyzed. RTL code can exhibit a form of locality of reference such that executing processes tend to be executed again. This property is termed executive temporal locality, and it can be exploited by migration systems to accelerate RTL simulation. In this dissertation, process migration is first formally modeled using Finite State Machines (FSMs). Upon FSMs are built programs, processes, migration realms, and the migration of process state within a realm. From this model, a taxonomy of migration realms is developed. Second, process migration is applied to the RTL simulation of digital circuits. The canonical form of an RTL process is defined, and transformations of HDL code are justified and demonstrated. These transformations allow a simulator to identify basic active units within the simulation and combine them to balance the load across a set of processors. Through the use of input monitors, executive locality of reference is identified and demonstrated on a set of six RTL designs. Finally, the implementation of a migration system is described which utilizes Virtual Machines (VMs) and Real Machines (RMs) in existing FPGAs. Empirical and algorithmic models are developed from the data collected from the implementation to evaluate the effect of optimizations and migration algorithms.
Ph. D.

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Ibanez, Enric. "Reengineering Project: Database Optimization and Migration." Thesis, Linnéuniversitetet, Institutionen för datavetenskap, fysik och matematik, DFM, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-9168.

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The purpose of this project is to help a growing company reform their static information system to a dynamic system compatible with growth. The solution consists of migrating the legacy system that they have in FileMaker to an open technology platform. To solve this specific problem “patterns” have been used and this project explains these general solution “patterns”. We understand patterns like a generic solution to persistent design problems. General solutions will not only be useful in this specific problem, but they will be useful in all kind of similar migration projects as well. This thesis gives a detailed explanation of how to apply these patterns into the AEMI specific problem and how they can be useful in the migration process. The solution of the problem then, is following the advice of “patterns” to achieve our goals; these goals are the requirements that are given from the company supervisor. After the migration process a redesign process must be done in order to organize the information. This redesign consists of organizing the migrated information as well as adding the new information in the correct place. This thesis focuses on the process of migrating from a legacy system to a MySQL system through the use of the generic solution called “patterns”. The final result is a MySQL database with all the old and new information together in a more adaptable platform for the company’s scalability.

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Li, Zhen. "Minority migration from 1985 to 2005 in China| Migration process, migration outcomes, and socioieconomic incorporation at destination places of four ethnic minority groups." Thesis, State University of New York at Albany, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10109581.

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As internal migration started to increase in the late 1970s in China, ethnic minorities have also participated in this demographic event to improve their livelihood. However, minority migration has been much neglected in the current literature. To fill the gap in the literature, the dissertation aims to: (1) examine migration selectivity and destination selection process of ethnic minorities in China; (2) investigate whether migration can lead to upward socioeconomic mobility for ethnic minorities; (3) assess the extent of socioeconomic integration of minority migrants at destination places; (4) reveal and explain differences in patterns of migration and destination adaption across ethnic groups; and (5) uncover temporal patterns of minority migration, migration outcomes, minority integration at destinations. To achieve these goals, this dissertation makes use of the micro-data of the 1990 China population census, the 1995 mini-census, the 2000 census and the 2005 mini-census.

Regarding minority migration process, model results suggest that education selectivity of minority migrants is mostly positive, but it is only consistently observed for the Zhuang. While migrant networks and co-ethnic networks does not matter much for the out-migration decision for minorities, they do weigh more on minority migrants’ decision as to where to go. Minority migrants tend to go to places with larger migrant networks. In general, they also go to places with more co-ethnics, but the effect of co-ethnic networks reveals important group-specific differences.

Minorities can mostly benefit from engaging in migration. However, what is interesting is the finding that the Uyghurs stand out as the only minority group that shows a trend of deteriorating migration outcomes. Moreover, evidence also reveals that for the Uyghurs and the Zhuang, long-distance migration is not more beneficial than short-distance migration.

Finally, very different patterns of incorporation at destination communities emerge from the analyses. The relative position of the Uyghur migrants to the Han is declining over time and in the most recent time period, they are doing significantly worse than their Han counterparts. The Hui and the Koreans are doing more successfully. Surprisingly, the Zhuang migrants are disadvantaged to the Han and this disadvantage is consistent across time.

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Budathoki, Aakash. "Migration & Modernity." Thesis, Karlstad University, Faculty of Social and Life Sciences, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-2809.

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The main objective of this essay is to analyze the challenges caused by today's modern phenomenon of change in our society and to discuss it in relationship to the process of migration. In doing so I focus on questions like, "what does it really mean when a person becomes a migrant and what does it mean to be the host country?" Becoming a migrant or a host country is a complex process which involves variety of challenges both for individuals and the locality. New inventions are made in the field of science and technology. Societies and social institutions are subjected to change and we undergo several changes or modifications to fit in to this changing system. This makes integration process more tedious and complex. I feel that the process of accepting and adopting begins from the very first moment in the new society. The one who comes in also brings in new cultural perspectives, new ideologies and beliefs. This establishes the background of plurality which has both positive and negative consequences.

I believe that every factor from bigger social institutions to minute incidents associated with an individual are of equal importance in understanding society as a whole. So I approach my research question here by considering both micro and macro theorists. I have also referred to migrations history of Sweden which provides general idea of types and mode of migration in the past few decades.

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Budathoki, Aakash. "Modernity & Migration." Thesis, Karlstad University, Faculty of Social and Life Sciences, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-2807.

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Summery

The main objective of this essay is to analyze the challenges caused by today’s modern phenomenon of change in our society and to discuss it in relationship to the process of migration. In doing so I focus on questions like, “what does it really mean when a person becomes a migrant and what does it mean to be the host country?” Becoming a migrant or a host country is a complex process which involves variety of challenges both for individuals and the locality. New inventions are made in the field of science and technology. Societies and social institutions are subjected to change and we undergo several changes or modifications to fit in to this changing system. This makes intigration process more difficult and complex. I feel that the process of accepting and adopting begins from the very first moment in the new society. The one who comes in also brings in new cultural perspectives, new ideologies and beliefs. This establishes the background of plurality which has both positive and negative consequences.

I believe that every factor from bigger social institutions to minute incidents associated with an individual are of equal importance in understanding society as a whole. So I approach my research question here by considering both micro and macro theorists. I have also referred to migrations history of Sweden which provides general idea of types and mode of migration in the past few decades.

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Chen, Lin. "Process migration and runtime scheduling for parallel tasks in computational grids." Click to view the E-thesis via HKUTO, 2007. http://sunzi.lib.hku.hk/hkuto/record/B38574172.

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Reber, Adrian [Verfasser], and Michael [Akademischer Betreuer] Resch. "Process migration in a parallel environment / Adrian Reber ; Betreuer: Michael Resch." Stuttgart : Universitätsbibliothek der Universität Stuttgart, 2016. http://d-nb.info/1118369416/34.

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Nakache, Delphine. "The "Othering" process: exploring the instrumentalisation of law in migration policy." Thesis, McGill University, 2009. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=40679.

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Migration law and policy are clearly committed to the state (and its citizens) at the expense of the migrant. Receiving societies regard the migrant as a threat to the order and unity of national identity but the migrant is, in fact, also constitutive of that order and unity. This reveals a paradoxical relationship of the migrant to law. Questions of identity and alterity occupy a pivotal place in investigations related to the treatment of the migrant subject. Identity is a construct which is indeterminate and relational. This construct of the migrant brings to the fore the dependence of the migration system on the image of the migrant as repressed and marginalized. Within the international legal system, definitional discourses regarding forced/voluntary migration also have serious identity and policy related implications. The exclusion of migrants who does not fit within the narrow “boxes” of international migration law occurs precisely because international law cannot develop its ideal self-image without a caste of international refusés. Like the nation-state, international migration law achieves parts of its legitimacy through exclusion. International migration law also provide an escape mechanism which the state can access in order to advance its political goals. Both domestically and internationally, migrants are subjected by the legal discourse on migration to a form of violence which suppresses their humanity. Migrants are commandeered to help constitute the identity of international law and national societies. This de-ethicalizes the relationship with the migrant by negating the migrant’s autonomous nature. It therefore becomes necessary to introduce the ethics of alterity in law and to move the migrant back into the centre of the migration discourse. A significant way to do this is to be aware of the violence which is perpetrated upon the migrant and to work towards the elaboration of a less state-centred system open to constant reconsideration.
Le droit et les politiques migratoires servent de manière délibérée l’intérêt de l’État (et de ses citoyens) au dépend de celui des migrants. Les sociétés d’accueil considèrent que le migrant est une menace à l’ordre et à l’unité de l’identité nationale mais le migrant est en en fait nécessaire pour la constitution d’une identité nationale ordonnée et unitaire. Ceci démontre la relation ambiguë entre le droit et le migrant. Les questions d’identité et d’altérité occupent une place centrale dans toute réflexion portant sur le traitement juridique du migrant. L’identité est un construit vague et relationnel et le système migratoire repose sur une image du migrant réprimé et marginalisé. Au sein du système juridique international, les discours portant sur la définition de la migration forcée/volontaire ont aussi des implications identitaires et politiques. En effet, l’exclusion du migrant qui ne correspond pas aux critères étroits du droit international des migrations est possible précisément parce que le droit international ne peut maintenir une image idéale sans une caste mondiale de refusés. Au même titre que l’État nation, le droit international des migrations construit donc, du moins partiellement, sa propre identité à travers des mécanismes d’exclusion. Le droit international des migrations constitue aussi une échappatoire utile pour faire avancer les visés politiques de l’État. Ainsi, à tous les niveaux, national et international, le migrant est assujetti à une forme de violence qui nie son humanité. Puisque le migrant existe aux yeux de l’État uniquement pour renforcer l’identité de celui-ci et du droit international, la relation entre le droit et le migrant s’en trouve vidée de son contenu éthique, notamment en refusant d’accorder au migrant toute autonomie. Il s’avère alors nécessaire d’introduire l’éthique de l’altérité dans le droit et de ramener le migr

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Chen, Lin, and 陳琳. "Process migration and runtime scheduling for parallel tasks in computational grids." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2007. http://hub.hku.hk/bib/B38574172.

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Kratter, Matilde <1995&gt. "An insight into ion migration process in commercial oil paint system." Master's Degree Thesis, Università Ca' Foscari Venezia, 2020. http://hdl.handle.net/10579/16928.

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Negli ultimi vent’anni, i fenomeni della migrazione ionica e della formazione di saponi metallici sono stati dei temi ampiamente discussi soprattutto perché hanno interessato diverse opere d’arte provenienti da tutto il mondo. Partendo dai riferimenti presenti in letteratura più aggiornati, il presente studio si è concentrato su pitture ad olio commerciali così da comprendere meglio tale fenomeno nelle pitture ad olio contemporanee. Il progetto di ricerca è stato fatto in collaborazione con l’ Universitat Politècnica de València (UPV) e i risultati ottenuti saranno incanalati dentro un progetto più ampio noto come progetto ProMeSa coordinato dalla professoressa Laura Fuster-López. Nella prima parte della tesi, alcuni campioni, forniti dal colorificio Golden (USA) e realizzati nel 2012, sono stati analizzati attraverso diverse tecniche analitiche, come OM, FT-IR-ATR, XRD, SEM-EDX, FORS and GC-MS. questo approccio multi-analitico ha permesso di raccogliere numerose informazioni sulla loro formulazione e sul tipo di interazione tra pigmenti e legante. La seconda parte, invece, è focalizzata sulla messa a punto di una nuova procedura GC-MS che possa essere il più adatta possibile all’identificazione dei saponi metallici in sistemi pittorici complessi. Basandosi sui riferimenti disponibili riguardati il suddetto tema, è stato individuato in maniera sperimentale un metodo innovativo in grado di dare il miglior responso in termini di preparazione dei campioni, limiti di rivelazione e accuratezza quantificativa. I risultati ottenuti hanno messo in luce la complessa composizione delle pitture analizzate dimostrando che oltre al pigmento e al legante erano presenti anche vari addittivi, tipicamente rintracciabili nelle formulazioni commerciali. I risultati hanno inoltre confermato il processo di formazione dei saponi metallici nei campioni ed in particolare la presenza di stearati. La procedura GC-MS sviluppata è stata in grado di identificare e facilmente quantificare gli acidi grassi coinvolti nella formazione dei saponi metallici discriminandoli da quelli presenti come acidi grassi liberi o come prodotti di ossidazione.

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Casiano, Victor Alejandro Rosa. "Case for a closer look at migration : analysis of the puerto rican experience." Master's thesis, Instituto Superior de Economia e Gestão, 2020. http://hdl.handle.net/10400.5/20824.

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Mestrado em Actuarial Science
Neste trabalho é feito o estudo da migração em Porto-Rico, tanto no curto como no longo, usando a análise de séries temporais e o processo estocástico de Ornstein Uhlenbeck. Os resultados mostram que, de acordo com a literatura, a migração é uma variável muito difícil de modelar. Apesar dessa dificuldade, mostra-se que a migração é uma variável que tem um impacto de longo prazo na economia, na demografia e na actividade seguradora de Porto-Rico. No final é dado um exemplo numérico com aplicações na actividade seguradora. São também apresentadas conclusões e perspectivas futuras para o estudo da migração em Porto-Rico.
Migration in Puerto Rico is modeled, both in the short-term and long-term, using time series analysis and the Ornstein Uhlenbeck Stochastic Process. Results show that, in agreement with previous works, migration continues to be a very difficult and volatile variable to model. However, it is shown that contrary to most of the literature, migration is a variable that does have a long-term impact on Puerto Rico?s economy, demography, and actuarial industry.
info:eu-repo/semantics/publishedVersion

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Xu, Liyan Ph D. Massachusetts Institute of Technology. "Urbanization process models, internal rural-urban migration, and the role of institutions in China : three essays on urbanization and migration." Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/107084.

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Thesis: Ph. D. in Urban and Regional Planning, Massachusetts Institute of Technology, Department of Urban Studies and Planning, 2016.
Cataloged from PDF version of thesis.
Includes bibliographical references.
This dissertation is a collection of three essays on urbanization and migration. The first essay is a treatment on the urbanization theory. I discuss the ambiguity in the urban concept, and propose a comprehensive urban concept which includes the demographic, physical, economic, social, and cultural dimensions of urban characteristics. Based on the concept, and through analyses of the countries' preference over specific urban definition methods, I propose the Kuznets Curve for urban definition complexity, and the Hypothesis of the Unbalanced Urbanization Process. I test the hypothesis with a case study of five countries: the United States, Mexico, China, India, and Ethiopia. With the findings I call for a paradigm shift in the study of the urbanization process, which constitutes the general framing of the dissertation. The next two essays concern the application of the framework in a specific country - China, and relevant studies on the country's internal migration. The studies are based on two nation-wide, large-sample surveys on the migrants and rural households' living conditions in 2008-2009 (n=2398) and 2014-2015 (n=2097). In the second essay, I study the life-cycle migration behavior pattern of China's internal rural-urban migrants. I first conduct a statistical treatment of the general demographics as well as individual-level migration-related behavioral patterns of the migrants, and then reconstruct the life history of the migrants through survival analyses on their migrating and return migrating behaviors, and also two Cox proportional hazard models respective to the two survival processes which examine the determinants of such behaviors. Results give rise to an overlapping generational and iterative pattern of the migrants' migration behavior with a filtration mechanism, which I call "the Circle of Life" model. Lastly, in the third essay, I examine the role of China's institutional environment in shaping the unique migration behavior pattern. I conduct a thorough documentation on the evolution, and especially the recent development of China's Hukou (household registration) and land ownership policies, and show the shift of a dual social structure as a result of the policy change. Furthermore, I develop two groups of discrete choice models to examine the formation of the migrants' urban settlement intentions. Overall, I conclude that China's institutions have played an empowering function, thus giving rise to an institution-bound rational choice behavior concerning migration and settlement. Lastly, I briefly discuss the implications of the findings on urbanization and development theories, as well as the policy suggestions.
by Liyan Xu.
Ph. D. in Urban and Regional Planning

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Alkhalil, Adel. "A model to support the decision process for migration to cloud computing." Thesis, Bournemouth University, 2016. http://eprints.bournemouth.ac.uk/24525/.

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Cloud computing is an emerging paradigm for provisioning computing and IT services. Migration from traditional systems setting up to cloud computing is a strategic organisational decision that can affect organisations’ performance, productivity, and growth as well as competitiveness. Organisations wishing to migrate their legacy systems to the cloud often need to go through a difficult and complicated decision-making process. This can be due to multiple factors including restructuring IT resources, the still evolving nature of the cloud environment, and the continuous expansion of the cloud services, configurations and providers. This research explores the factors that would influence decision making for migration to the cloud, its impact on IT management, and the main tasks that organisations should consider to ensure successful migration projects. The sequential exploratory strategy is followed for the exploration. This strategy is implemented through the utilisation of a two-stage survey for collecting the primary data. The analysis of the two-stage survey as well as the literature identified eleven determinants that increase the complexity in the decisions to migrate to the cloud. In the literature some of those determinants were realised, accordingly, there have been many proposed methods for supporting migration to the cloud. However, no systematic decision making process exists that clearly identifies the main steps and explicitly describes the tasks to be performed within each step. This research aims to fill this need by proposing a model to support the decision process for migrating to cloud. The model provides a structure which covers the whole process of migration decisions. It guides decision makers through a step-by-step approach aiding organisations with their decision making. The model was evaluated by exploring the views of a group of the cloud practitioners on it. The analysis of the views demonstrated a high level of acceptance by the practitioners with regard to the structure, tasks, and issues addressed by the model. The model offers an encouraging preliminary structure for developing a cloud Knowledge-Based Decision Support System.

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Schulz, Christopher [Verfasser]. "A detailed process model for large scale data migration projects / Christopher Schulz." München : Verlag Dr. Hut, 2013. http://d-nb.info/1036345637/34.

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Chang, Shu-Chun. "Evaluation of the migration process from I-Lan county to Taipei city." Thesis, University College London (University of London), 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.395763.

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Chowdhury, M. Shadid Rashi, and MD: Aminul Islam. "SaaS Mig : A PROCESS MODEL FOR MIGRATING LEGACY SYSTEM TO SAAS." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-186408.

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Software as a Service (SaaS) är en metod för att leverera mjukvara där lösningen är centralt lagrad och erbjuden som en tjänst. SaaS erbjuder flera olika fördelar ur både den tekniska och den kommerciella synvinkeln. Som en konsekvens av det är många företag mycket motiverade att flytta sina föråldrade system till SaaS för att fortsätta vara konkurrenskraftiga på marknaden. Tyvärr så är sådana stora migreringar ofta utmanande och problematiska, SaaS lägger till ännu fler utmaningar till den problematiken. Den här studien föreslår en effektiv processmodell för SaaS-migrering när systemen som ska migreras till SaaS är föråldrade. Den föreslagna modellen siktar på att guida SaaS-migreringsprojektet i rätt riktning och därmed utöka sannolikheten för att det skall lyckas. Kvalitativa metoder har använts för att utveckla och validera modellen. Den initiala modellen utvecklades från experimentiell kunskap i kombination med att studera och analysera relevant arbete i området. Modellen modifierades iterativt ytterligare genom att konsultera både akademiska och industri-experter med relaterad bakgrund. Slutligen så valdes experted på ämnet ut och öppna intervjuer genomfördes för att validera modellen. Resultaten från intervjuerna föreslår att den föreslagna process-modellen är väl anpassad för att appliceras i industrin och förväntas kunna hjälpa en organisation att genomföra SaaS-migreringsprojekt effektivt och framgångsrikt.
Software as a Service (SaaS) is a software delivery method in which software is centrally hosted and offered as a commodity. SaaS provides numerous advantages both from technical and business perspective. Hence, many companies are highly motivated to move their legacy systems to the SaaS in order to stay competitive in the market. However, any migration of legacy systems is usually challenging and failure prone. SaaS migration adds more challenges on top of that. This thesis proposes an effective SaaS migration process model for migrating legacy application to SaaS. Proposed process model aims to guide the SaaS migration projects in the right direction and thus increase the success rate. Qualitative method was used to develop and validate our model. The initial SaaS migration process model was developed from experimental knowledge in combination with studying and analysing relevant work in this field. The model was further modified in iteration by consulting both academic and industry experts with related background. Finally, experts were selected on the subject matter and conducted structured open-ended interviews to validate the model. The interview results suggest that the proposed process model is well suited to be applied in industry and is largely expected to help an organization to drive the SaaS migration project effectively and successfully.

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Hassanbasry, Andrea. "Case study of technological change process in software upgrades management migrating from Windows-based to Web-based application /." Online version, 2001. http://www.uwstout.edu/lib/thesis/2001/2001hassanbasrya.pdf.

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Katz, David Gabriel. "Popcorn Linux: Cross Kernel Process and Thread Migration in a Linux-Based Multikernel." Thesis, Virginia Tech, 2014. http://hdl.handle.net/10919/52561.

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Proliferation of new computing hardware platforms that support increasing numbers of cores, as well as increasing ISA heterogeneity, is creating opportunity for systems software developers to question existing software architecture. One promising emerging systems architecture is the multikernel, pioneered in Barrelfish OS. The multikernel directly addresses the challenges of high core counts and increased heterogeneity by partitioning the system into multiple independently running kernel instances which cooperate to form a single operating system. Popcorn Linux is an adaptation of the multikernel concept to a Linux environment, melding the multikernel concept with the power and ubiquity of the Linux platform. The goal of the Popcorn Linux project is to provide a Linux-based single-system image environment for heterogeneous hardware. In constructing this environment, Linux must be extended to distribute the plethora of operating system services that it provides across kernel instances. This thesis presents the newly developed Popcorn Linux mechanism for migrating tasks and their address spaces between kernel instances at arbitrary points in their execution. Both process and thread migration is supported, and distributed address spaces are maintained and guaranteed to remain consistent between distributed thread group members running on different kernel instances. Tasks can migrate through an unlimited number of kernel instances, as well as back to previously visited kernel instances. Additionally, the full task life-cycle is supported, allowing migrated tasks to exit and create new children on whichever kernel instance happens to be hosting them. The mechanisms developed were vetted through unit testing, review, and a number of compute-bound benchmarks in a homogeneous x86 64bit environment. Correctness was demonstrated, and performance metrics were acquired. Popcorn Linux performance was shown to be reasonable when compared to SMP Linux. The mechanisms developed are therefore deemed feasible. Scalability was determined to be a function of workload characteristics, where in some cases Popcorn Linux out-scales SMP Linux and in other cases SMP Linux out-scales Popcorn Linux. Optimizations are recommended to reduce the maturity gap between Popcorn Linux and SMP Linux, improving Popcorn Linux performance.
Master of Science

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Ye, Huaide. "Does the family structure matter in the process of migration decision making? : a longitudinal analysis of migration among American youth: 1984-1994 /." The Ohio State University, 1999. http://rave.ohiolink.edu/etdc/view?acc_num=osu1488187763845613.

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Widerstedt, Barbro. "Moving or staying? : job mobility as a sorting process." Doctoral thesis, Umeå universitet, Institutionen för nationalekonomi, 1998. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-96660.

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Klauß, Tobias. "An Interacting Particle System for Collective Migration." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2008. http://nbn-resolving.de/urn:nbn:de:bsz:14-ds-1228074229228-77328.

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Kollektive Migration und Schwarmverhalten sind Beispiele für Selbstorganisation und können in verschiedenen biologischen Systemen beobachtet werden, beispielsweise in Vogel-und Fischschwärmen oder Bakterienpopulationen. Im Zentrum dieser Arbeit steht ein räumlich diskretes und zeitlich stetiges Model, welches das kollektive Migrieren von Individuen mittels eines stochastischen Vielteilchensystems (VTS) beschreibt und analysierbar macht. Das konstruierte Modell ist in keiner Klasse gut untersuchter Vielteilchensysteme enthalten, sodass der größte Teil der Arbeit der Entwicklung von Methoden zur Untersuchung des Langzeitverhaltens bestimmter VTS gewidmet ist. Eine entscheidende Rolle spielen hier Gibbs-Maße, die zu zeitlich invarianten Maßen in Beziehung gesetzt werden. Durch eine Simulationsstudie und die Analyse des Einflusses der Parameter Migrationsgeschwindigkeit, Sensitivität der Individuen und (räumliche) Dichte der Anfangsverteilung können Eigenschaften kollektiver Migration erklärt und Hypothesen für weitere Analysen aufgestellt werden
Collective migration and swarming behavior are examples of self-organization and can be observed in various biological systems, such as in flocks of birds, schools of fish or populations of bacteria. In the center of this thesis lies a stochastic interacting particle system (IPS), which is a spatially discrete model with a continuous time scale that describes collective migration and which can be treated using analytical methods. The constructed model is not contained in any class of well-understood IPS’s. The largest part of this work is used to develop methods that can be used to study the long-term behavior of certain IPS’s. Thereby Gibbs-Measures play an important role and are related to temporally invariant measures. One can explain the properties of collective migration and propose a hypothesis for further analyses by a simulation study and by analysing the parameters migration velocity, sensitivity of individuals and (spatial) density of the initial distribution

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Shonkwiler, Kenneth D. "Circle Letters, Produce Auctions, and Softball Games: Investigating the Internal Dynamics of the Old Order Migration Process." Ohio University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1397734257.

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Moss, Byron D. Delahoussaye Guy R. "An analysis of migration alternatives of the apply process within the United States Reserves." Monterey, Calif. : Naval Postgraduate School, 2008. http://bosun.nps.edu/uhtbin/hyperion-image.exe/08Mar%5FMoss.pdf.

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Thesis (M.S. in Information Technology Management)--Naval Postgraduate School, March 2008.
Thesis Advisor(s): Cook, Glenn. "March 2008." Description based on title screen as viewed on April 29, 2008. Includes bibliographical references (p. 113-114). Also available in print.

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Delahoussaye, Guy R. "An analysis of migration alternatives of the apply process within the United States Reserves." Thesis, Monterey California. Naval Postgraduate School, 2008. http://hdl.handle.net/10945/4253.

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As the Navy Reserve Force continues to align with the Active Navy to create a total force, initiatives are in place to migrate existing Navy Manpower, Personnel, and Distribution systems into a single enterprise system. This migration will improve data integrity, and provide the foundation for a position based Navy which is needed to support Sea Warrior. With this focus in mind, this thesis studies the feasibility of combining the current Navy Reserve Officer detailing and placement systems (APPLY/JOAPPLY) with other Navy systems with similar functionalities. The goal is to find a reasonable solution that will ultimately assist the Navy Reserves' transition toward the total force enterprise system. Currently APPLY/JOAPPLY does not exist within the active Navy; however, both active and reserve Navy use Career Management System-Interactive Detailing (CMS-ID) as a personnel management tool. Not only does CMS-ID manage enlisted records, but it also has access to officer data, though not currently in use. Using a common system for both the Active and Reserve components could provide an economy of scales in systems management and maintenance, thus providing cost savings through the elimination of the management of two different information systems.

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Ports, Michael O. "LATERALLY ASSOCIATED PROTEINS MODULATE A6 INTEGRIN CLEAVAGE, A PERMISSIVE PROCESS UTILIZED DURING CANCER METASTASIS." Diss., The University of Arizona, 2009. http://hdl.handle.net/10150/194361.

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Expression of A6 integrin, a laminin receptor, on tumor cell surfaces is associated with reduced patient survival and increased metastasis in a variety of tumors. In prostate cancer, tumor extra capsular escape occurs in part via laminin coated nerves and vascular dissemination, resulting in clinically significant bone metastases. Our group previously identified a novel form of A6 integrin, called A6p, generated by urokinase (uPA) dependent cleavage of the laminin binding domain from the tumor cell surface. Although functional consequences of cleavage have been characterized, little is known about how this process is regulated.Regulation of uPA mediated cleavage was identified by a laterally interacting protein expressed on the cellular surface. A direct interaction between the urokinase receptor (uPAR) and A6 integrin was characterized. This direct interaction was responsible for the extracellular cleavage of A6. Transient knockout of A3 integrin, a known interacting partner of uPAR, increased uPAR association with A6 integrin and enhanced production of A6p. Analysis of tissue obtained from human prostate tumors confirmed uPAR and A6 integrin expression in invasive disease. Taken together the results demonstrate a novel and dynamic role for uPAR regulation of integrin dependent adhesion through lateral interaction.Using the known conformation sensitivity of integrin function to I determined if engagement of the extracellular domain by antibodies inhibited integrin cleavage and the extravasation step of metastasis. Both endogenous and inducible levels of A6p were inhibited by engaging the extracellular domain of A6 with monoclonal antibody J8H. J8H inhibited tumor cell invasion through Matrigel. A SCID mouse model of extravasation and bone metastasis produced detectable, progressive osteolytic lesions within three weeks of intracardiac injections. Injection of tumor cells, pre-treated with J8H, delayed the appearance of metastases. Validation of the A6 cleavage effect on extravasation was confirmed through a genetic approach using tumor cells transfected with uncleavable A6 integrin. Uncleavable A6 integrin significantly delayed the onset and progression of osseous metastases out to 6 weeks post injection. The results suggest that A6 integrin cleavage permits extravasation of human prostate cancer cells from circulation to bone and can be manipulated to prevent metastasis.

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Plato, Nina. "The Child-perspective in the Swedish asylum-process." Thesis, Malmö högskola, Institutionen för globala politiska studier (GPS), 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:mau:diva-22581.

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Jag har i den här uppsatsen velat se på begreppet barn-perspektiv och hur det kommer till uttryck i den svenska asylprocessen framför allt i den svenska utlänningslagen och tillämpningen av den i migrationsverkets arbete med att handlägga och besluta i asylärenden.Genom att göra en historisk tillbakablick har jag tittat på när och varför barnperspektivet uttrycks och hur det utvecklas. Jag har också tittat på svårigheterna med att implementerabeslutet att ha ett barn-perspektiv i asylprocessen och då tagit in olika faktorer som påverkar implementeringen av ett beslut i det dagliga arbetet. Jag har använt mig av SOU-rapporter och propositioner som finns skrivna inför lagändringar och övrig litteratur som berör barnperspektivet och flyktingpolitik. För att inte enbart få en studie av lagtext utan få lite andra perspektiv på barnperspektivet och asylprocessen har jag också gjort intervjuer med representanter för Migrationsverket, Röda Korset och Barn i Väntan projektet. Vad jag framför allt diskuterar ar varför barn-perspektivet fortfarande inte är framgångsrikt implementerat och vad som gör det så svårt att genomföra ett sådant beslut. Ligger det i beslutet som sådant, migrationsmyndigheterna eller ligger orsaken i området det ska implementeras i, d.v.s. i asylprocessen?
My main purpose with this thesis has been to look at the child-perspective and how it comes to expression in the Swedish asylum-process, above all in the Swedish Aliens Act and its implementation in the work of the Migration Board in its handling and decision-making of asylum-cases. I have also done a historical review to look at when and why the childperspective first came to expression and how it has evolved. Furthermore, I have looked at thedifficulties in implementing the decision of having a child-perspective in the asylum-process and have there taken in different factors that affect the implementation of a decision in the daily work. I have used State official reports and Governmental bills that are written before alterations in the legislation and other literature about the child-perspective and the refugeepolitics.In order to not only get a study of words of an Act I have also interviewedrepresentatives from the Migration Board, the Red Cross and Children in Waiting Project and a public counsel. What I in particular discuss is why the child-perspective still is not successfully implemented and what makes it so difficult to carry through such a decision. Is it the decision itself, the migration authorities or is it because of the area in which it should be implemented, i.e. the asylum-process?

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Kale, Basak. "Europeanisation Beyond the European Union : Migration Policy and the EU's Influence on Turkey's Accession Process." Thesis, University of Oxford, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.517166.

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Shin, Julia Jiwon. "Unpacking the gendered process of international migration : the case of migrant women in South Korea." Thesis, University of Warwick, 2008. http://wrap.warwick.ac.uk/2371/.

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This study explores the `gendered' process of international migration in Asia. It proposes that gender is one of the principal analytical factors for theoretical conceptualisation in the study of international migration. The study examines the case of Korea, which has been transformed into one of the major labour receiving countries in Asia since the early 1990s, but which has received less attention in the English literature on migration. The aim of the study is to examine the process of international migration in the historical, social and political contexts of Korea, by way of the integration of theoretical analyses with a critical gendered lens. A theoretical framework for this study is based on the observation that theorising the multifaceted process of international migration - which takes place with various interrelated variables - requires multidisciplinary and multidimensional approaches. The study therefore analyses the social formation of the `gendered' process of international migration by looking closely at the three different migratory stages of women migrants: the migratory journey; employment; and settlement in the country of destination. The primary empirical data used in the study were collected during a six-month period of field research - between April and September 2005. Qualitative data were derived from in-depth interviews with 31 migrant women, as well as employers, government officials and NGO workers. Based on a feminist standpoint of the outsider-within, the study locates the lives of migrant women from the margin to centre of the analysis. The empirical study shows that migrant women are `outsiders' who exist `within' the very core of international migration system in which they are, nevertheless, marginalised and silenced. The study suggests that the ostensibly gender-neutral process of migration is gender specific, resulting in different migration experiences between women and men. Gendered and racialised social relationships of power are pervasive in the structure of international migration and state institutions. At the same time, the differently `sedimented' practices of women and men - who strategically draw on institutional rules and resources to facilitate migration - become institutionalised in a gendered way. This, in turn, influences the gendered process of international migration that is reproduced and transformed over time.

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Biela, Joachim. "Between logics of attractivity and migration management : Third-country national students’ application process to Sweden's Higher Education Institutions." Thesis, Linköpings universitet, Institutionen för samhälls- och välfärdsstudier, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-162904.

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In a context where Higher Education Institutions increasingly seek to attract students, this study follows the path of third country national students through their application process. Their particular status, situates them at the intersection between openness and closure. Between internationalization strategies that seek to attract them, and migration management policies that sometimes facilitate, sometimes restrain their movement. In a qualitative approach, it explores the application process’ different steps to Sweden's Higher Education Institutions. It uses Foucault’s governmentality, de Certeau’s strategies and tactics, along with Bourdieu’s understanding of capital, to analyze data issued from nine semi-structured interviews with third country national students, studying or recently graduate from Linköping’s University. Departing from students’ narratives on their application process to Sweden’s Higher Education Institutions, this study unravels the complex links between internationalization strategies and migration management, and how their disciplining effects appear throughout the application process.

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Chetty, Maushami. "The repatriation process: does South Africa live up to its human rights obligations?" Diss., University of Pretoria, 2004. http://hdl.handle.net/2263/1074.

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"The Aliens Control Act (ACA) was racially biased towards immigrants who were easy to assimilate into the white population. It thus did not accord with the principles of the new regime based on equality and reflected an exclusionist apartheid ideology. Not only was the act itself repugnant, but the practice of the enforcement bodies in arrest, detention and deportation procedures was maligned as well. There were allegations of violence, arbitrary arrest, harassment, exploitation, unfit detention facilities and lack of procedural fairness. This precipitated the drafting of the Green and White Papers on International Migration, the much contested Immigration Bill and the Immigration Act (IA) itself. The well researched Green Paper's recommendations about the shift in focus from control to management of migration were not taken cognisance of. The government, in consultation with US immigration specialists, focused on control to prevent an influx from the rest of Africa into South Africa's newly 'opened' borders. The only concession granted was the amnesties for long-time residents (usually mineworkers and refugees) from SADC countries, but this was not well responeded to. The South African government seemed to be intent on keeping the exclusionist mindset, with a shift from race to nationality. The IA has to be examined to see whether the contents of the legislation which inform the repatriation process meet constitutional and international law muster. This should be done with the background and criticisms of the ACA in mind. The actual practice of the enforcement agencies that effect the arrest, detention and deportation must be measured against South Africa's accepted human rights norms. A consideration of the past harsh and unconstitutional immigration control mechanisms must take place as well to track South Africa's progress towards a human rights based repatriation program." -- Introduction.
Thesis (LLM (Human Rights and Democratisation in Africa)) -- University of Pretoria, 2004.
http://www.chr.up.ac.za/academic_pro/llm1/dissertations.html
Centre for Human Rights
LLM

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Guo, Guanlong. "Coupled Hydro-Mechanical Modelling of Gas Migration in Saturated Bentonite." Thesis, Université d'Ottawa / University of Ottawa, 2020. http://hdl.handle.net/10393/41552.

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Bentonite is regarded as an ideal geomaterial for the engineering barrier system of a deep geological repository (DGR) where nuclear wastes are disposed, as it has several desirable properties for sealing the nuclear wastes, including low permeability, low diffusion coefficient, high adsorption capacity and proper swelling ability. Nevertheless, gas migration in saturated bentonite may undermine the sealing ability of the geomaterial. Previous experimental studies showed that the gas migration process is accompanied by complex hydromechanical (HM) behaviors, such as gas breakthrough phenomenon, development of preferential pathways, build-up of water pressure and total stress, nearly saturated state after gas injection test, localized consolidation, water exchange between clay matrix and developed fractures and self-sealing process. These experimentally observed behaviors should be properly modelled for conducting a reliable performance assessment for the geomaterial over the lifespan of DGR. In this thesis, two different coupled HM frameworks, i.e., one based on double porosity (DP) concept, referred to as coupled HM-DP framework, and the other on phase field (PF) method, referred to as coupled HM-PF framework, are proposed to simulate the gas migration process in saturated bentonite. For the coupled HM-DP framework, the saturated bentonite is assumed as a superposition of a MAcro-Continuum (MAC) and a MIcro-Continuum (MIC). Two-phase flow is only allowed in the MAC, whereas the MIC is impermeable to both water and gas. Nevertheless, the water can transfer between the MIC and the MAC under the water pressure gap. The first coupled HM model in this framework is based on a double effective stress concept. Mechanical behaviors of the MAC and the MIC are respectively governed by Bishop-type effective stress and Terzaghi’s effective stress. The model can well simulate the evolutions of both gas pressure and gas outflow rate, the water exchange between clay matrix and developed pathways, the high degree of saturation and the consolidation of clay matrix. To account for the development of preferential pathways, the damaging effect has been introduced in the framework. In this improved model, Bishop-type effective stress for the MAC is replaced by the independent stress state variables, i.e., net normal stress and suction, since using the net normal stress is beneficial to simulating tensile failure under high gas pressure. Numerical results showed that the damage-enhanced model can well describe the effect of the development of preferential pathways on the build-up of water pressure and total stress. In addition, the proposed hysteretic models for intrinsic and relative permeabilities make the coupled HM framework more flexible to reproduce the experimental results. To explicitly simulate the development of preferential pathways, a coupled HM-PF framework is developed by using Coussy’s thermodynamic theory and the microforce balance law. The coupled HM-PF framework is implemented in the standard Finite Element Method (FEM). To avoid the pore pressure oscillation and enhance the computational efficiency, a stabilized mixed finite element, in which linear shape functions are selected for interpolating all primary variables, is adopted to discretize the whole domain. In the developed framework, swelling pressure (initial stress) is accounted for by introducing a modified strain tensor that is the sum of the strain tensor due to deformation and the strain tensor calculated from the initial stress. The numerical results showed that the developed coupled HM-PF framework can capture some important behaviors, such as the discrete pathways, localized gas flow, built-up of water pressure and total stress under constant volume condition and nearly saturated state in clay matrix. A spatially autocorrelated random field is introduced into the framework to describe the heterogeneous distribution of HM properties in bentonite. The heterogeneity is beneficial to simulating the fracture branching and the complex fracture trajectory. Numerical results showed that some factors, such as Gaussian random field, coefficient of variation, boundary condition and injection rate, have significant influences on the fracture trajectory. At the end of the thesis, the obtained numerical results are synthesized and analyzed. Based on the analysis, the pros and cons of the developed numerical models are discussed. Corresponding to the limitations, some recommendations are proposed for future studies.

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Dissertations / Theses on the topic 'Process migration'

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