Dissertations / Theses on the topic 'Reverse fork'
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BALDI, GIORGIO. "IDENTIFICATION AND CHARACTERIZATION OF STRESSED REPLICATION FORK INTERMEDIATES." Doctoral thesis, Università degli Studi di Milano, 2019. http://hdl.handle.net/2434/609359.
Full textHallberg, Jonatan, and Joel Winninge. "In-plant reverse logistics: The reversed flow of steel scrap for reuse at Sandvik Materials Technology." Thesis, Linköpings universitet, Kommunikations- och transportsystem, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-119981.
Full textBuss, Amanda Sória. "Proposta de embalagem para logística reversa em projeto de Design para o Território." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2013. http://hdl.handle.net/10183/85034.
Full textThe packaging reverse logistics (PRL) and the territorial design (TD) are approaches with different emphases, but that have characteristics that complement each other. The packaging, for example, appears as a strategy with the potential for territory communication and environmental sustainability - assumptions of TD - through reverse logistics. The main of this work is to propose guidelines and practices for integration between the two approaches, PRL and TD. A process of organic production was used as the analysis unit. The method adopted was the action research, containing activities such as: (i) systematic literature review to identify and analyze concepts, guidelines, objectives and actions that allow integration between the PRL and TD; (ii) identification of opportunities for PRL in the context of TD, from a process mapping and suggestion of tools such as blueprint, Service Failure Mode and Effect Analysis (SFMEA) SWOT matrix; and (iii) testing the integration guidelines proposed in a packaging project. The main results of the work are: presenting a set of guidelines for PRL in TD projects; a diagnosis of a opportunity of PRL in a TD project; proposal of a tool to evaluate the level of integration between the two approaches and the degree of formality present in the planning and in the management of PRL, called Radar TD-PRL; redesign of the logistics system and packaging design, and implementation of the tool RADAR TD-PRL. It was found that the guidelines, objectives and integrated actions between PRL and TD guided satisfactorily the PRL system and the packaging design in the investigated case, showing improvements compared to its initial state. The featured guidelines are: protection and perpetuation of identity and heritage, economic development, reduced environmental impact, improving the company's image / business, and, to a lesser extent, infrastructure support system for PRL.
McAdam, Ian. "Connectionist models for reverse engineering." Thesis, McGill University, 1993. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=67543.
Full textPimenta, Aline de Barros. "Os agentes ambientais e a logística reversa dos resíduos sólidos urbanos na cidade de Juiz de Fora - MG." Universidade Federal de Juiz de Fora, 2012. https://repositorio.ufjf.br/jspui/handle/ufjf/1918.
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CAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
Em função da geração crescente e diversificada de Resíduos Sólidos Urbanos e da implantação de um sistema de gestão inadequado, configura-se o agravamento de problemas ambientais, econômicos e sociais, relacionados tanto à saúde pública, quanto à contaminação do solo e da água. Diante deste contexto urbano, mundialmente reproduzido, apresenta-se como objetivo específico evidenciar a atividade logística reversa informal, realizada pelos catadores, e a sua capacidade de ampliar as possibilidades produtivas da tecnologia reversa e potencializar a redução, reutilização e reciclagem energética e material dos resíduos sólidos produzidos cotidianamente. A fim de avaliar a relação entre os trabalhadores de rua (catadores), o ambiente de trabalho e a qualidade de vida que caracteriza seus hábitos e atuações na cidade de Juiz de Fora, Minas Gerais, foram analisados dados aferidos em 2008 e reiterados em 2010 e 2011, com base em referencial teórico multidisciplinar com o propósito de viabilizar uma análise apurada da realidade da gestão municipal de resíduos sólidos em comparação à realidade nacional. A busca por uma maior eficiência das políticas de gestão dos resíduos sólidos e da integração deste sistema está diretamente relacionada à conscientização de seus geradores e o comprometimento dos diversos setores, públicos e privados. Com a análise do potencial ambiental, econômico e social da redução, reutilização e reciclagem, energética e material, dos resíduos sólidos gerados e coletados na cidade, foi possível inferir que a gestão adequada de resíduos associa-se à maior sustentabilidade das operações de logística reversa e reinserção de bens e materiais ao ciclo produtivo.
Due to the growing and diverse generation of urban solid waste and the establishment of an inadequate management system, the environmental, economic and social problems, all related to the public health and the contamination of soil and water, have gotten worse. In the face of this urban context, reproduced worldwide, it is presented as a specific objective to evidence the reverse logistics informal activity, conducted by the garbage collectors, and its ability to expand the productive possibilities of the reverse technology and enhance the energetic and material reduction, reuse and recycling of solid waste produced daily. In order to evaluate the relationship between street workers (garbage collectors), the work environment and the quality of life that characterizes their habits and actions in the city of Juiz de Fora, Minas Gerais, were analyzed measured data in 2008 and repeated in 2010 and 2011, based on a multidisciplinary theoretical reference with the aim of enabling a detailed analysis of the reality of the municipal management of solid waste in comparison to the national reality. The search for a greater efficiency of management policies of solid waste and the integration of this system is directly related to the awareness of their generators and the commitment of several sectors, public and private. By analyzing the environmental, economic and social potential of the reduction, reuse and recycling, energetic and material, of solid waste generated and collected in the city, we could infer that the proper management of waste has been associated to a greater sustainability of the reverse logistics operations and reintegration of goods and materials to the production cycle.
Lima, Daniel Carneiro de. "Analysis of market forces and state in the formation of reverse chains of steel containers for beverages and lubricating oil in the textile industry." Universidade Federal do CearÃ, 2007. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=3647.
Full textThis study analyzes the market and governmental forces informing the recycling policies of companies in the beverage can industry and the textile lubricant industry in CearÃ. The two industries were chosen for a comparative study of environmental strategies due to differences in the specific environmental regulation to which they are subjected. Companies in these sectors are adopting more responsible environmental protection policies as part of their national and international competitive strategies, since consumers and investors are increasingly recognizing the relation between industrial performance and environmental quality. Likewise, regulation is grower stricter regarding accountability for environmental damage. The main stakeholder influences affecting company policy-making were analyzed qualitatively using the model of institutional pressures proposed by Delmas (2004), according to which companies respond to the demands of the market, regulation and other stakeholders in order to increase their competitive advantage. The companies were also analyzed with regard to their environmental strategies and their understanding of and reaction to external pressures in view of their history of environmental performance, competitive position and organizational structure. The findings for the two industries compared in the study were organized according the model of institutional pressures, relating adopted environmental practices to external pressures and company profile. Environmental practices were evaluated with the help of indicators reflecting the quality of environmental management and its insertion into the overall business system, including general management, human resources, purchasing department, legal department, production, operation and marketing. The market â informed by international environmental standards â was found to be the strongest influence on company recycling policies in the beverage can industry. In the case of textile lubricants, these policies were most often determined by the international market and national regulations.
O trabalho apresenta uma anÃlise das forÃas de mercados e de Estado que agem sobre a formaÃÃo das cadeias reversas das embalagens de aÃo para bebidas e do Ãleo lubrificante utilizado pela indÃstria tÃxtil. A escolha desses dois setores teve como objetivo a realizaÃÃo de um estudo comparativo da conduta ambiental e estratÃgica das empresas cearenses em um ambiente onde ocorre regulamentaÃÃo especÃfica, como à o caso do Ãleo lubrificante, e onde nÃo existe uma regulamentaÃÃo especÃfica, que caracteriza a cadeia das embalagens de aÃo para bebida. Destaca-se tambÃm o fato de as empresas desses setores adotarem a proteÃÃo ambiental como parte de suas estratÃgias competitivas nacionais e internacionais, pois, tanto os consumidores como os investidores, estÃo comeÃando a ver com maior clareza as relaÃÃes entre o desempenho comercial e a qualidade ambiental. AlÃm das exigÃncias dos clientes, ressalta-se o fato de as legislaÃÃes terem se tornado mais rigorosas quanto à responsabilidade por danos ambientais. Mediante de uma anÃlise qualitativa, foram avaliadas as principais influÃncias exercidas pelas partes interessadas, segundo o Modelo das PressÃes Institucionais, proposto por Delmas (2004). Com base neste modelo, a empresa responde Ãs exigÃncias dos mercados, da legislaÃÃo e das demais partes interessadas, com o objetivo de obter vantagem competitiva, alÃm de se averiguar o comportamento ambiental das empresas diante da posiÃÃo estratÃgica que ocupam e a maneira como essas percebem e reagem Ãs pressÃes em funÃÃo de fatores especÃficos, tais como: o histÃrico de desempenho ambiental, a posiÃÃo competitiva das empresas-matrizes e a estrutura organizacional das organizaÃÃes. As tÃxteis e as integrantes da cadeia das embalagens de aÃo para bebida no Cearà tiveram os seus resultados organizados segundo o modelo das pressÃes institucionais, que relaciona a adoÃÃo de prÃticas ambientais em relaÃÃo Ãs pressÃes sofridas e de acordo com as caracterÃsticas das empresas. Avaliou-se tambÃm a conduta ambiental mediante de um conjunto de indicadores que refletem a qualidade do gerenciamento ambiental ao longo do sistema de negÃcios, incluindo administraÃÃo geral, recursos humanos, compras, jurÃdico, produÃÃo e operaÃÃo e marketing. A pesquisa constatou que, no setor das embalagens de aÃo para bebidas, o mercado, influenciado por padrÃes internacionais de conduta ambiental, à o que exerce maior influÃncia sobre as empresas para a formaÃÃo da cadeia reversa. Jà na cadeia reversa do Ãleo lubrificante na indÃstria tÃxtil, constatou-se que os mercados internacionais e a legislaÃÃo nacional sÃo os que exercem maiores influÃncias para a formaÃÃo dessas cadeias reversas.
Liu, Xiaodong. "Abstraction : a notion for reverse engineering." Thesis, De Montfort University, 1999. http://hdl.handle.net/2086/4214.
Full textSit, Eric N. 1977. "Reverse HTTP tunneling for firewall traversal." Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/9086.
Full textIncludes bibliographical references (leaf 104).
This thesis describes a reverse hypertext tunneling protocol that allows a web browser from outside a firewall to access a web server inside a firewall. Reverse HTTP utilizes pre-existing proxy services to create a transparent and scalable method to tunnel through a firewall. Reverse HTTP provides an excellent solution to the problem of providing controlled access to firewall protected resources. This is because unlike traditional firewall traversal methods, reverse HTTP is completely software based and requires no changes to the existing firewall configuration. Reverse HTTP works because it tunnels traffic in a form which a web proxy server on the firewall allows to pass. A Java software implementation has been developed and tested to demonstrate the usefulness and efficacy of the reverse HTTP protocol. This experimental implementation proves that a portable, scalable solution can be developed with comparable performance characteristics to a normal web proxy. Although the implementation can be used to view protected web sites, it does not compromise the overall network security.
by Eric N. Sit.
S.B.and M.Eng.
Hughes, Nina(Nina Yuchen). "Reverse logistics supply chain process modeling and simulation." Thesis, Massachusetts Institute of Technology, 2019. https://hdl.handle.net/1721.1/122581.
Full textThesis: S.M., Massachusetts Institute of Technology, Department of Civil and Environmental Engineering, 2019, In conjunction with the Leaders for Global Operations Program at MIT
Cataloged from PDF version of thesis.
Includes bibliographical references (page 67).
As consumer preferences shift towards online shopping and utilizing their homes as fitting rooms, traditional brick and mortar retailers are faced with the challenge to adapt. Many retailers are experiencing a growing number of returned merchandize, many of which cannot be easily resold to consumers due to various supply chain challenges. This thesis explores the opportunities to improve the consumer returns process and presents methods for modeling the supply chain process for reverse logistics in the retail industry derived from case studies. The model then allows for hypothesis testing. By changing parameters in the model, this thesis further explores the scenarios in which the supply chain process may be improved to increase margin and decrease cost. The primary recommendations include specific modifications to the current reverse supply chain flow, enabling new channels that improve speed and margin, as well as developing the decision tool further for better accuracy and integration into the supply chain.
by Nina Hughes.
M.B.A.
S.M.
M.B.A. Massachusetts Institute of Technology, Sloan School of Management
S.M. Massachusetts Institute of Technology, Department of Civil and Environmental Engineering
Boyle, Casey Alex. "Process enablers for successful reverse engineering inside large organizations." Thesis, Massachusetts Institute of Technology, 2020. https://hdl.handle.net/1721.1/126949.
Full textThesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, in conjunction with the Leaders for Global Operations Program at MIT, May, 2020
"May 2020." Cataloged from the official PDF of thesis.
Includes bibliographical references (pages 131-135).
Reverse engineering has the potential to be a strategic advantage for many engineering companies. As companies continuously look for new ways to improve their business and technical expertise, reverse engineering facilitates detailed knowledge capture for many possible applications. These applications open new channels of revenue, create more options in the market, and drive value to customers. Although reverse engineering is nothing new to industry and has been actively researched, this thesis seeks to understand the key enablers that promote successful reverse engineering at scale in a modern corporation. Given that many large firms are set up with the forward engineering process in mind, what are the differentiated characteristics of an effective reverse engineering organization? By treating reverse engineering as a system of interconnected dependent events, an organization can be shaped to build a workflow with the necessary linkages for successful execution and scaling.
This "pull" more than "push" process that establishes clear communication between functions is key to preventing rework, shortening flow time, and increasing quality. Reverse engineering, like traditional forward engineering, must be organized as an integrated multifunctional process with organized information sharing, compromise, and iteration. Additionally, the teardown process itself is a central piece of the puzzle for successful reverse engineering. This is due to the multiple strategic linkages associated and interconnectedness required by key stakeholders for understanding the investigated component. A teardown is defined as an observant disassembly of a component for information gain. This thesis focuses more deeply into the teardown process. By showcasing challenges that lead to common errors, teardown process recommendations are made for a more efficient way to reverse engineer.
A lack of early stakeholder engagement prior to teardown frequently leads to inefficient knowledge sharing. More active stakeholder participation is recommended to improve the overall quality of teardown reports and serve as an additional opportunity to discover a component's hidden complexities. It is also recommended that formal design tools, such as functional analysis, be utilized for truly understanding a component's physical behavior. Implementing these recommendations and tools will increase the efficiency and output quality of reverse engineering teams, reducing rework.
by Casey Alex Boyle.
M.B.A.
S.M.
M.B.A. Massachusetts Institute of Technology, Sloan School of Management
S.M. Massachusetts Institute of Technology, Department of Mechanical Engineering
Akgul, Tankut. "Assembly Instruction Level Reverse Execution for Debugging." Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/5249.
Full textHong, I.-Hsuan Ethan. "Decentralized Decision-making for Reverse Production Systems." Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/14099.
Full textMeuli, Christian. "Reverse assays for high-thorughput multiplexd screening." Thesis, KTH, Skolan för bioteknologi (BIO), 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-149452.
Full textRadkevitch, Ulad. "Online reverse auctions for procurement of services /." Rotterdam : Erasmus Research Institute of Management, 2008. http://hdl.handle.net/1765/13497.
Full textMarklund, Sarah. "Reverse Stress Test Optimization : A study on how to optimize an algorithm for reverse stress testing." Thesis, Umeå universitet, Institutionen för fysik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-149178.
Full textPhillips, Hannah(Hannah Michelle). "A data-driven approach to continuous improvement in reverse logistics." Thesis, Massachusetts Institute of Technology, 2020. https://hdl.handle.net/1721.1/126915.
Full textThesis: S.M., Massachusetts Institute of Technology, Department of Civil and Environmental Engineering, in conjunction with the Leaders for Global Operations Program at MIT, May, 2020
Cataloged from the official PDF of thesis.
Includes bibliographical references (pages 78-79).
Verizon may rely on third-party logistics providers (3PLs) to manage some aspects of the reverse supply chain of Fios equipment. As a result, it depends on the 3PL to continually strive for increased quality, reliability, capacity, and speed. Above all, in order to have a successful partnership, the process must be economical for the 3PL. As several sources of variation are detrimental to the 3PL's margins and cause operational problems, Verizon is investing in the supplier relationship to ensure that the 3PL is profitable and positioned for the future. Making sure there is a "win-win" relationship is beneficial for both parties and helps to ensure that the investments that have been made will continue to result in success, including operational improvements. To do this, a culture of continuous improvement and data-driven decisions needs to be cultivated and developed at the 3PL. The goal of this project is two-fold. First, there is a need to understand the variation that exists in the 3PL's process as well as the associated costs, which include overtime, ineffective labor and production planning, and high turnover. The secondary goal of the project is to empower the 3PL to make data-driven decisions in the future and start to shift their culture to one that aligns better with Verizon's. By showing the benefits of collaboration between the two companies, this project will help build trust. In this thesis, we discuss how process mining is used to understand the 3PL's current state and guide data-driven continuous improvement. We introduce several opportunities for handling variation, including creating visibility into return volumes, reducing defects caused by incorrect packaging, and creating feedback mechanisms for operators. This is done in close collaboration with the 3PL to ensure they will ultimately have ownership of implementation.
by Hannah Phillips .
M.B.A.
S.M.
M.B.A. Massachusetts Institute of Technology, Sloan School of Management
S.M. Massachusetts Institute of Technology, Department of Civil and Environmental Engineering
Uichanco, Joline Ann Villaranda. "Data-driven revenue management." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/41728.
Full textIncludes bibliographical references (p. 125-127).
In this thesis, we consider the classical newsvendor model and various important extensions. We do not assume that the demand distribution is known, rather the only information available is a set of independent samples drawn from the demand distribution. In particular, the variants of the model we consider are: the classical profit-maximization newsvendor model, the risk-averse newsvendor model and the price-setting newsvendor model. If the explicit demand distribution is known, then the exact solutions to these models can be found either analytically or numerically via simulation methods. However, in most real-life settings, the demand distribution is not available, and usually there is only historical demand data from past periods. Thus, data-driven approaches are appealing in solving these problems. In this thesis, we evaluate the theoretical and empirical performance of nonparametric and parametric approaches for solving the variants of the newsvendor model assuming partial information on the distribution. For the classical profit-maximization newsvendor model and the risk-averse newsvendor model we describe general non-parametric approaches that do not make any prior assumption on the true demand distribution. We extend and significantly improve previous theoretical bounds on the number of samples required to guarantee with high probability that the data-driven approach provides a near-optimal solution. By near-optimal we mean that the approximate solution performs arbitrarily close to the optimal solution that is computed with respect to the true demand distributions.
(cont.) For the price-setting newsvendor problem, we analyze a previously proposed simulation-based approach for a linear-additive demand model, and again derive bounds on the number of samples required to ensure that the simulation-based approach provides a near-optimal solution. We also perform computational experiments to analyze the empirical performance of these data-driven approaches.
by Joline Ann Villaranda Uichanco.
S.M.
Tam, Ka-wing. "Feature based reverse engineering for thermoforming mould design /." Click to view the E-thesis via HKUTO, 2006. http://sunzi.lib.hku.hk/hkuto/record/B36537196.
Full textMatic, (Mihelcic) Sanja. "Reverse Mortgage as an Option for Funding Retirement." Thesis, Jönköping University, JIBS, Economics, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-12414.
Full textSanli, Ozgur. "A Reverse Proxy For Protecting Web Based Applications." Master's thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/4/1230382/index.pdf.
Full textPalthepu, Srinivas. "Scalable program recognition for knowledge-based reverse engineering." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape7/PQDD_0018/NQ37907.pdf.
Full textDunnewijk, Jeroen. "Reverse flow adsorption technology for homogeneous catalyst recycling." Enschede : University of Twente [Host], 2006. http://doc.utwente.nl/57601.
Full textMagdalinos, Christos. "An information retrieval tool for reverse software engineering." Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=24025.
Full textTam, Ka-wing, and 譚家榮. "Feature based reverse engineering for thermoforming mould design." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2006. http://hub.hku.hk/bib/B36537196.
Full textHerzog, Petra [Verfasser]. "Reverse genetics for Human Coronavirus NL63 / Petra Herzog." Bonn : Universitäts- und Landesbibliothek Bonn, 2015. http://d-nb.info/1080561269/34.
Full textBouma, Andrew Thomas. "Split-feed counterflow reverse osmosis for brine concentration." Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/118668.
Full textThis electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 73-77).
Brine concentration is a useful operation that allows for increased recovery ratios in water treatment systems, reduction of waste volumes, and the production of minerals from saline brines. As our world moves towards a more sustainable future, improvements in energy-efficient brine concentration will be important. While viable brine concentration technologies exist, current methods are often inefficient. In this thesis, a model is developed to simulate Counterflow Reverse Osmosis (CFRO), a membrane-based, pressure-driven brine concentration technology. Using this model, a single CFRO module is simulated and its performance characterized. Entropy generation within a single-stage system is analyzed, which provides insights for configuring and optimizing multistaged systems. Additionally, a parametric analysis of membrane parameters provides direction for the development of CFRO-specific membranes. Two existing configurations of CFRO are discussed, and compared with a new third configuration, split feed CFRO, which is presented for the first time here. Split feed CFRO systems are simulated and optimized to provide guidance for system design. A variety of multistage systems operating at a range of recovery ratios are simulated, and the results compared are with existing desalination and brine concentration technologies. Potential is shown for the maximum recovery ratio of RO systems to increase significantly when hybridized with split-feed CFRO brine concentration systems, while the energy requirements of these hybridized systems is similar to, or an improvement on, the expected performance of conventional RO systems operating at high pressures and the same conditions. A large reduction in energy usage when compared to commonly used evaporative brine concentrators is shown to be possible.
Funded by the Kuwait Foundation for the Advancement of Sciences (KFAS) Project No. P31475EC01
by Andrew Thomas Bouma.
S.M.
Kovacs, Jason Richard. "Engineering nanostructured selective layers for reverse osmosis membranes." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/98709.
Full textCataloged from PDF version of thesis.
Includes bibliographical references (pages 122-142).
A major challenge to communities across the world in the next century will be ensuring millions have access to adequate freshwater resources. Studies from the UN World Health Organization indicate that over 1.1 billion people currently lack access to reliable and secure freshwater supplies, with an estimated 2.5 million deaths per year from diseases associated with poor access and sanitation in 2007. Reverse osmosis (RO), a process through which water is desalted via pressurized flow past a salt-selective membrane, is an energy-efficient method to generate freshwater from oceanic, brackish, and waste water sources. However, there are a number of challenges to scaling up RO processes to large scale production, including the need to improve membrane selectivity and throughput. One method to assemble selective layers for RO membranes is layer-by-layer (LbL) assembly, which is a flexible, scalable assembly technique that enables the incorporation of a myriad of polyelectrolytes and inorganic nanoparticles into thin films. There is a gap in the scientific literature concerning the use of LbL to generate RO selective layers where previous approaches have not taken full advantage of the LbL process to incorporate nanomaterials that can generate ordered nanostructures for salt rejection. In particular, high-aspect ratio clay platelets are ideal for such a purpose; it was hypothesized that effective salt rejection could be achieved by hindering the diffusion of solvated ions through nano-channels formed by the platelets embedded within a polymer matrix. This body of work examines the application of spray layer-by-layer (spray-LbL) assembly with clay composite thin film architectures to generate nanostructured selective layers for use in RO membrane technology. First, appropriate substrates were identified as support layers for the deposition of spray- LbL assembled clay composite thin films. Both electrospun bisphenol-A polysulfone (PSU) mats of varying fiber diameter and polyethersulfone (PES) ultrafiltration (UF) membranes with varying pore diameters were examined. Second, a range of materials were investigated for the spray-LbL deposition of clay composite films. Laponite clay platelets were incorporated into several different film architectures including strong polyelectrolytes as well as cross-linkable weak polyelectrolytes to form both bilayer and tetralayer film architectures. The clay content was controlled via manipulating assembly conditions such as the pH and spray times of the film components. Assembled membrane architectures were tested at industrial RO operating conditions in dead-end permeation cells and evaluated for salt rejection, water permeability, and mechanical strength. Ultimately, it was determined the most uniform and robust films were those deposited on PES membranes with 30 nm pores, closely matching the characteristic length of the LAP clay platelets to reduce the impact of bridging. Although all the film architectures tested exhibited significantly greater water permeability than commercially available RO selective layers, the salt selectivity was found to be highly dependent on the film architecture and assembly conditions. The best performing film architecture consisted of a cross-linked clay composite tetralayer film, exhibiting salt rejection of 89% for aqueous 10,000 ppm NaCl solution with an order of magnitude increase in water permeability over a commercially-available thin film composite membrane. The key conclusion drawn from the studies indicate the presence of an optimal zone where the incorporation of clay platelets introduces additional salt selectivity via size exclusion, balanced with the cross-linked polymer component of the film to improve the mechanical strength and reduce the risk of critical defect formation during operation. Taken together, these investigations represent a new approach using structured nanomaterials to develop next generation clay composite RO selective layers. The increased water permeability of the clay composite selective layers offers an attractive advantage in desalting applications where high flux is desirable, such as with brackish water resources as well as in membrane unit operations near their thermodynamic limit.
by Jason Richard Kovacs.
Ph. D.
Detrich, Kahlil. "Electroding Methods for in situ Reverse Osmosis Sensors." Thesis, Virginia Tech, 2010. http://hdl.handle.net/10919/31207.
Full textMaster of Science
Harrison, Don. "Solar powered reverse osmosis desalination for remote communities." Thesis, Harrison, Don (1989) Solar powered reverse osmosis desalination for remote communities. Honours thesis, Murdoch University, 1989. https://researchrepository.murdoch.edu.au/id/eprint/40085/.
Full textBlack, Paul. "Techniques for the reverse engineering of banking malware." Thesis, Federation University of Australia, 2020. http://researchonline.federation.edu.au/vital/access/HandleResolver/1959.17/175276.
Full textDoctor of Philosophy
Susanto-Lee, Robertus. "Efficiency improvements for small-scale reverse-osmosis systems." Thesis, Curtin University, 2006. http://hdl.handle.net/20.500.11937/286.
Full textSusanto-Lee, Robertus. "Efficiency improvements for small-scale reverse-osmosis systems." Curtin University of Technology, Department of Electrical Engineering, 2006. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=16974.
Full textPetersen, Brian J. (Brian Jude). "Reverse supply chain forecasting and decision modeling for improved inventory management." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/80988.
Full textCataloged from PDF version of thesis.
Includes bibliographical references (p. 69-71).
This thesis details research performed during a six-month engagement with Verizon Wireless (VzW) in the latter half of 2012. The key outcomes are a forecasting model and decision-support framework to improve management of VzW's reverse supply chain inventory. The forecasting model relies on a reliability engineering formulation and incorporates a learning component to allow incremental forecast improvement throughout the device lifecycle. The decision-support model relies on Monte Carlo simulations to quantify the uncertainty and risk associated with different inventory management policies. These tools provide VzW stakeholders with a full-lifecycle perspective so that inventory planners can avoid costly end-of-life underages and overages. Prior to this effort, inventory planners at VzW relied on a three month returns forecast despite the fact that customers can return devices more than three years after launch. The decision-support model replaces existing heuristics to improve inventory management. Model efficacy is demonstrated through case studies. For a variety of representative SKUs, the returns forecast model is found to predict cumulative lifecycle returns within 10% using data available six months from launch. Had inventory been managed according to the policies recommended by the decision support model instead of policies from existing heuristics, VzW could have avoided an end-of-life stockout of more than 20,000 devices for a particular SKU.
by Brian J. Petersen.
M.B.A.
S.M.
Göpfert, Johannes Georg. "Model-based fault diagnosis via structural analysis of a reverse osmosis plant." Master's thesis, Pontificia Universidad Católica del Perú, 2021. http://hdl.handle.net/20.500.12404/19043.
Full textBorja, Ramirez Vicente. "Redesign supported by data models with particular reference to reverse engineering." Thesis, Loughborough University, 1997. https://dspace.lboro.ac.uk/2134/11705.
Full textRoll, Bruce A. "Online reverse auctions : a pricing tool for government contracting /." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2000. http://handle.dtic.mil/100.2/ADA386693.
Full textThesis advisors, Nissen, Mark E. ; Gates, William R. "December 2000." Includes bibliographical references (p. 63-64). Also available online.
Massons, Gassol Gerard. "Biofouling control in reverse osmosis membranes for water treatment." Doctoral thesis, Universitat Rovira i Virgili, 2017. http://hdl.handle.net/10803/461092.
Full textLa osmosis inversa (OI) es una de las tecnologías de purificación de agua más competitivas. Los sistemas de OI han evolucionado significativamente en los últimos años para proporcionar soluciones reales y sostenibles a los problemas relacionados con el agua. Uno de los principales obstáculos que impide la expansión del uso de OI en la reutilización del agua es la pérdida de rendimiento que los elementos de OI experimentan al operar con aguas contaminadas. Este fenómeno de ensuciamiento sigue siendo uno de los mayores desafíos para los elementos de OI utilizados en plantas industriales o de tratamiento de aguas residuales. Debido a la complejidad de estudiar estos problemas en sistemas de escala industrial, es necesario desarrollar protocolos para reproducir los efectos en equipos de laboratorio. Los efectos del ensuciamiento suelen ocurrir después de varios meses. Sin embargo, para poder realizar la investigación en un tiempo realista, el proceso necesita ser acelerado de manera controlada y lo más realista posible. Se ha estudiado el efecto de diferentes variables operacionales en el desarrollo del ensuciamiento biológico. También se ha evaluado el papel de los parámetros de construcción de módulos de OI, probando en paralelo diferentes membranas y espaciadores, para mejorar el diseño de elementos resistentes al ensuciamiento. Los resultados de los ensayos realizados mostraron claramente que diferentes químicas de membrana pueden proporcionar una reducción significativa en los niveles de bioensuciamiento. Sin embargo, se encontró que el principal contribuyente al desarrollo de biofilms fue el espaciador. El diseño del espaciador se estudió en detalle para lograr un comportamiento equilibrado en módulos de OI que tratan aguas propensas al ensuciamiento biológico. Se ensayaron espaciadores con diferentes espesores, espaciamiento y ángulo. Algunos diseños mostraron ventajas en la perdida presión generada, así como en la acumulación de ensuciamiento biológico y orgánico.
Reverses osmosis (RO) filtration is one of the most competitive water purification technologies. RO systems have evolved significantly in the last years to provide real and sustainable solutions to water-related problems. One of the main hurdles that hinders RO expansion in water reuse, is the loss of performance that RO elements suffer when dealing with contaminated waters. This phenomenon known as fouling, remains to be one of the biggest challenges for RO elements used in industrial or wastewater treatment plants. Due to the complexity to study these problems in large scale systems, protocols need to be developed in order to mimic full-scale plants operation on a bench scale. Fouling problems are usually occurring after several month of operations. However, for a realistic time-scale research, the process needs to be accelerated in a controlled way and as similar as possible to what would be occurring naturally. The effect of different operating variables on biofouling development was studied. The role of RO module construction was also evaluated, testing different membranes and feed spacers side-by-side, to guide the improvements on the design of fouling resistant elements. The results from the trials performed clearly showed that different membrane chemistries can provide significant reduction in the levels of biofouling detected after operation. However, it was found that the main contributor to biofilm development was feed spacer. Large differences in the amount of biofouling generated could be associated with feed spacer presence. Feed spacer design was then studied in detail to achieve a balanced performance in spiral wound RO modules treating waters prone to biofouling. Feed spacers with various thickness, spacing and angle were tested and some designs showed advantages in pressure drops, as well as on biologic and organic fouling accumulation.
Malmsten, Anders. "Reverse Transcriptase Activity Assays for Retrovirus Quantitation and Characterization." Doctoral thesis, Uppsala University, Department of Genetics and Pathology, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-4737.
Full textReverse transcriptase (RT) is a crucial enzyme for retrovirus replication, and its presence in the virion is indispensable for infectivity. This thesis illustrates the use of RT activity assays as tools for quantitation and characterization of different retroviruses, particularly HIV.
A non radioactive assay, using microtiter plates, for the RT of Moloney murine leukemia virus (MMuLV) was developed. Assay conditions for MMuLV and HIV-1 RT, together with isozyme specific RT activity blocking antibodies, were shown useful for discrimination between RTs from different retrovirus genera. RT activity assay for HIV-1 was found to quantitate different subtypes more equally efficient than p24 antigen assays did.
Viral load (VL), the amount of HIV particles in the blood, is an important marker of the clinical status of an infected person. A method for VL determination based on RT activity (ExaVir Load) was developed. After plasma pretreatment, to inactivate cellular DNA polymerases, virions in patient plasma were immobilized on a gel, which was washed to remove disturbing factors. The virions were lysed with a detergent containing buffer and the lysate eluted. Finally, the RT activity in the lysate was determined and found to correlate strongly to VL by RNA according to a PCR based standard method (Roche Amplicor 1.5). The second version of the method was able to measure VL down to approximately 400 HIV-1 RNA copies/ml. The usefulness of RT from the VL procedure for determination of susceptibility towards anti-HIV drugs was demonstrated, and the results were in agreement with genotypic data.
Due to its technical simplicity, and ability to detect a broad range of HIV-1 subtypes, ExaVir Load and the drug susceptibility application are interesting for clinical use, particularly but not only in resource limited settings. The concept is also potentially useful for research purposes, e.g. in combination with specific RT assay conditions.
Anpalagan, Subramaniam Alagan. "Reverse link channel access techniques for CDMA packet networks." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/NQ63640.pdf.
Full textCorrigan, Gary E. "Evaluation of reverse transcriptase assay for viral load monitoring /." Stockholm, 2007. http://diss.kib.ki.se/2007/978-91-7357-207-1/.
Full textChamberlain, Philip Paul. "Structural mechanisms of drug resistance for HIV reverse transcriptases." Thesis, University of Oxford, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.403941.
Full textSaibani, Nizaroyani. "Performance measurement for reverse and closed-loop supply chains." Thesis, University of Nottingham, 2010. http://eprints.nottingham.ac.uk/12102/.
Full textEl, Barky Sahar Sobhy. "An enhanced method for core assessment in reverse logistics." Thesis, University of Strathclyde, 2011. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=18808.
Full textGorlow, Stasnislaw. "Reverse audio engineering for active listening and other applications." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2013. http://tel.archives-ouvertes.fr/tel-00959329.
Full textShen, Guoling 1967. "Approximation with interval B-splines for robust reverse engineering." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/43456.
Full textNurminen, F. C. (Fiia-Charlotta). "Probabilistic model of fault displacement hazard for reverse faults." Master's thesis, University of Oulu, 2018. http://urn.fi/URN:NBN:fi:oulu-201809152805.
Full textPFDHA-menetelmä (Probabilistic fault displacement hazard analysis) on kehitetty seismisiin siirrosvyöhykkeisiin liittyvän riskin sekä seismisen siirtymän määrän ja jakauman arviointiin. Menetelmä on kehitetty normaalisiirroksille, mutta sitä on kehitetty edelleen sivuttaissiirroksiin ja työntösiirroksiin sopivaksi. Työntösiiroksille on aiemmin kehitetty vain pääsiirroksen siirtymän todennäköisyyttä ja määrää kuvaavat laskelmat, mutta sekundäärisiirrosten analyysi on puuttunut tieteellisestä keskustelusta. Tämän pro gradu -tutkielman tarkoitus on luoda todennäköisyyksiin perustuva ennustusmalli, jota voidaan käyttää mallintamaan maanpinnan muutoksiin liittyvää riskiä työntösiirrosten ympäristössä. Tämän tutkielman analyysi perustuu 11 historiallisen, hyvin tutkittuun työntösiirrosmaanjäristykseen. Näistä luotua tietokantaa käytettiin sekundäärisiirrosten avaruudellisen jakauman arvioimiseen sekä sekundäärirepeämisen vaimenemissuhteen analysoimiseen etäisyyden pääsiirrokseen kasvaessa. Käytetty menetelmä perustuu pääpiirteissään perinteiseen PFDHA-menetelmään, mutta erityisesti näiden sekundäärisiirrosten analyysin osalta menetelmää koskevia päätöksiä tuli tehdä työn edetessä, jotta lopputuloksena oli tilastollisesti pitävä ja uskottava malli, jota voidaan käyttää riskin arvioinnissa. Malli käyttää syötteenään sekundäärisiirrosten tapahtumisesta ja siirrosten suuruudesta johdettujen todennäköisyysfunktioiden muuttujia, sekä mallinnettavan siirroksen pintageometriaa. Malli laskee sekundäärirepeämän todennäköisyyden ylittää annettu siirtymä tai määritetyllä todennäköisyydellä tapahtuvan siirtymän suuruuden 10 x 10 m ruudukolla pääsiirroksen ympäristössä kullekin ruudulle erikseen. Yhdessä näille ruuduille lasketuista arvoista muodostuu jatkumoja, joita voidaan kuvata kartalla. Tämä antaa mahdollisuuden maanjäristykseen liittyvän seismisen riskin tarkkaan paikkakohtaiseen analyysiin. Työn viimeisessä osassa kehitettyä mallia sovelletaan Pohjois-Suomessa sijaitsevaan Suasselän jääkauden jälkeiseen työntösiirrokseen ja sen ympäristöön. Mallia sovelletaan skenaariolle, jossa siirros liikkuu koko pituudeltaan, ja maanpinnan liikuntojen todennäköisyyttä mallinnetaan siirroksen ympäristössä. Tässä työssä kehitettyä mallia voidaan soveltaa mille tahansa hyvin tunnetulle, aktiiviseksi määritellylle työntösiirrokselle siirroksen seismisen riskin arvioimiseen tietyissä kohteissa siirroksen ympäristössä
Pas, Joshua W. "Contract and strategic network design for reverse production systems." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/22577.
Full textCommittee Co-Chair: Ammons, Jane C.; Committee Co-Chair: Realff, Matthew J.; Committee Member: Griffin, Paul M.; Committee Member: Peoples, Robert; Committee Member: Thomas, Valerie.
Nafziger, John S. "Reverse parameterization of B-spline surfaces for data transfer." Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-06302009-040414/.
Full textHarrison, Don. "Solar powered reverse osmosis desalination: Technology for remote communities." Thesis, Harrison, Don (2001) Solar powered reverse osmosis desalination: Technology for remote communities. PhD thesis, Murdoch University, 2001. https://researchrepository.murdoch.edu.au/id/eprint/52404/.
Full textEid, Roy George. "Reverse engineering toolbox for pedagogical applications." Thesis, 2012. http://hdl.handle.net/2152/ETD-UT-2012-05-5678.
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