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Cheng, Sheng-shyr. "Time allocation adjustment in married couple with children families /." free to MU campus, to others for purchase, 1996. http://wwwlib.umi.com/cr/mo/fullcit?p9737886.
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Chavez, Joy. "Couple leisure time| Building bonds early in marriage through leisure." Thesis, Utah State University, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=1586601.
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Participation in couple leisure is related to marital satisfaction as well as lower divorce rates; however, Americans seem to have less time available to participate in couple leisure and may have a harder time attaining role balance. There is currently limited research about how role balance may affect leisure as well as how couples manage to balance their leisure time with their other responsibilities, ensuring they have time to spend together in high interaction leisure. We also know very little about other possible benefits couples may experience as a result of participating in couple leisure and the factors that may either facilitate or constrain positive leisure. Using a qualitative approach to data collection and analysis, and informed by symbolic interaction theory, I interviewed nine couples in order to explore the phenomenon of newlywed couple leisure, and address these issues. Couples found significant benefits and meaning through participation in couple leisure activities. They also perceived that participation in leisure together increased satisfaction with their marriages. Many factors were found to constrain or facilitate a positive leisure experience, including time, money, and others. It was found that role balance plays a large part in finding time to participate in leisure as a couple. Being able to role balance helped couples to better enjoy the benefits and meaning couple leisure provided.
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Chavez, Joy Lynne. "Couple Leisure Time: Building Bonds Early in Marriage Through Leisure." DigitalCommons@USU, 2015. https://digitalcommons.usu.edu/etd/4262.
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Participation in couple leisure is related to marital satisfaction as well as lower divorce rates; however, Americans seem to have less time available to participate in couple leisure and may have a harder time attaining role balance. There is currently limited research about how role balance may affect leisure as well as how couples manage to balance their leisure time with their other responsibilities, ensuring they have time to spend together in high interaction leisure. We also know very little about other possible benefits couples may experience as a result of participating in couple leisure and the factors that may either facilitate or constrain positive leisure. Using a qualitative approach to data collection and analysis, and informed by symbolic interaction theory, I interviewed nine couples in order to explore the phenomenon of newlywed couple leisure, and address these issues. Couples found significant benefits and meaning through participation in couple leisure activities. They also perceived that participation in leisure together increased satisfaction with their marriages. Many factors were found to constrain or facilitate a positive leisure experience, including time, money, and others. It was found that role balance plays a large part in finding time to participate in leisure as a couple. Being able to role balance helped couples to better enjoy the benefits and meaning couple leisure provided.
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Alderete, Jacquelyn M. "Exploring Extension Faculty Members' First-Time Experience With Funded Couple Relationship Education." DigitalCommons@USU, 2014. https://digitalcommons.usu.edu/etd/3297.
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Family and Consumer Sciences (FCS) Extension faculty members are increasingly involved in offering couple and relationship education (CRE), but some have limited background in this format of family life education. This study used a phenomological approach to examine the experiences of Extension faculty members who offered CRE in their respective counties for their first time. Data were collected through face-to-face and telephone interviews. Four themes emerged from the interview data. First, considerations for offering this type of education included valuing CRE, having sufficient and specific knowledge about the needs of the county for CRE, and access to other forms of resources (mentors, previous training, or funding). Second, successes were discussed in terms of creating positive partnerships, successful recruitment strategies, and resources (utilization of funds and getting trained in CRE for the event). Third, faculty members described challenges including a lack of partnerships, limited resources, recruitment struggles, and lack of sufficient funds. Fourth, the reflections from the faculty members included plans and changes for future programming as faculty members reflected back on their actual experiences. These findings provide guidance for Extension faculty members with limited experience who are interested in offering CRE.
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Johnson, Heather Ann. "The Contribution of Couple Leisure Involvement, Leisure Time and Leisure Satisfaction to Marital Satisfaction." Diss., CLICK HERE for online access, 2005. http://contentdm.lib.byu.edu/ETD/image/etd982.pdf.
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Cooke, Kathryn Louise. "Models of Forgiveness and Adult Romantic Attachment in Ended Relationships: Forgiveness Over Time." VCU Scholars Compass, 2006. http://scholarscompass.vcu.edu/etd/1038.
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This study examined models of self and other as they relate to attachment, forgiveness, emotional and cognitive reactions to a breakup, relationship variables, and positive and negative feelings toward the self and former partner after a romantic relationship is ended. This study also tested how these variables change over time. Data were collected over a period of five weeks from 130 undergraduates who had experienced a breakup within the two weeks prior to beginning the study. Data were analyzed with a series of univariate and multivariate analyses of variance. Results found that there were differences in how participants reacted to the relationship breakup based on attachment style. There were some changes over time in the variables for all the attachment styles, and there was only one interaction between time and attachment style. Results are discussed in terms of previous research findings. Limitations of the current study are discussed and suggestions for future research are presented.
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Bäckström, Caroline A. "Professional and social support for first-time mothers and partners during childbearing." Doctoral thesis, Hälsohögskolan, Högskolan i Jönköping, HHJ. CHILD, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-38334.
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Background: Expecting a child and becoming a parent is one of life’s major events, during which the parents’ perspective on life and their couple relationship changes. For some parents, childbearing entails a decrease in parental couple relationship quality. The way in which parents are able to cope with childbearing may be connected with their Sense of Coherence; which is a person’s ability to perceive life as comprehensible, manageable and meaningful. For parents’ positive childbearing experiences, professional and social support have been proven to be valuable. However, far from all parents have access to social support; furthermore, professional support does not always meet the needs of expectant parents. Hence, more research is needed to increase knowledge about expectant parents’ experiences of professiona land social support. In addition, more research is needed to explore factors associated with quality of couple relationship among parents during childbearing. Aims: The overall aim of the thesis was to explore professional and social support for first-time mothers and partners during childbearing in relation toquality of couple relationship and Sense of Coherence. Methods: The study’s designs were explorative, prospective and longitudinal; both qualitative and quantitative methods were used. Specifically, explorative designs, qualitative methods and phenomenographic analysis were used to explore expectant first-time mothers’ (I) and partners’ perceptions of professional support (II). Furthermore, an explorative design, qualitative method and qualitative content analysis were used to explore expectant first-time mothers’ experiences of social support (III). Within Study IV, a prospective longitudinal design, descriptive statistics, non-parametric tests and multiple linear regression analysis were used to evaluate factors associated with quality of couple relationship among first-time mothers and partners, during pregnancy and the first six months of parenthood. Results: The overall results of the thesis revealed both similarities and differences between expectant first-time mothers’ and partners’ perceptions of professional support, effects from social support and associated factors with perceived quality of couple relationship. The similarities were; both mothers and partners perceived that professional support could facilitate partner involvement, influence their couple relationship and facilitate contacts with other expectant parents. According to first-time mothers’ experiences, their couple relationship with their partner was also strengthened by social support during pregnancy. Further, the results showed that both first-time mothers’ and partners’ higher perceived couple relationship quality six months after birth, was associated with their higher perceived social support. The results showed also that both mothers and partners perceived their quality of couple relationship to decrease and Sense of Coherence to increase six months after childbirth, compared to the pregnancy. Differences revealed were such as: higher Sense of Coherence was only associated with mothers’ higher perceived quality of couple relationship, and first-time mothers reported perceiving more social support compared to the partners both during pregnancy, first week and six months after childbirth. Conclusions: Professional and social support can strengthen first-time mothers and partners both individually and as a couple, in their abilities to cope with childbearing. On the individual basis, the expectant parents could be strengthened through professional and social support that contributed to their understanding and feeling of being prepared for childbirth and parenting, for instance. As a couple, the parents were strengthened by professional support that included the partner’s role, as well as higher perceived social support overall. In contrast, lack of support could have a negative influence on the expectant parents’ feeling of being prepared for childbirth and parenting. Besides this, the results indicates that childbearing has a positive effect on parents’ abilities to cope with life even though their quality of couple relationship decrease. Professionals can use these results in their further understanding about how to offer satisfactory support to first-time mothers and partners during childbearing.
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McCarthy, Laura A. "Influences of couple conflict type, division of labor, and violated expectations on first-time parents' individual and marital well-being." [Gainesville, Fla.] : University of Florida, 2006. http://purl.fcla.edu/fcla/etd/UFE0013463.
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Khesbak, Hassan. "Time-resolved HYDRATION-PERTURBATION-FTIR spectroscopy: A new method to identify water H-bond networks that couple hydration to DNA conformation." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2011. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-78111.
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The solvent-solute interface of a biomolecule is a dynamic but yet highly structured domain that links a chemically diverse solute surface to the chemically homogeneous bulk aqueous phase. The role of the resulting intermediate domain, i.e. the "hydration shell", in regulating DNA structure and recognition has been addressed here by time-resolved infrared spectroscopy. A highly reproducible automated hydration pulse regime was established and implemented for attenuated total reflectance (ATR) Fourier transform infrared (FTIR) spectroscopy to monitor the structural response of DNA to an incremental growth of its hydration shell on its intrinsic time scale of seconds. The transition from the crystallographically defined BI to the BII substate of B-DNA was found to be driven by the increase of water disorder upon growth of the hydration shell, derived from the water OH-stretching absorption frequency and band width changes. 2D correlation analysis was used to identify different water clusters from the temporal behaviour of their water OH stretching frequencies. The results show that BII-stabilizing structural constraints are exerted by strong water-DNA H-bonds in the grooves of B-DNA and are relieved when the groove-bound water merges into a contiguous hydration shell with the less H-bonded PO2- -solvation sphere at ~14 water molecules per DNA phosphate. The H-bond imbalance at the disjunct hydration sites is split symmetrically around the average H-bond strength of bulk water. Thus, merging into a contiguous hydration shell proceeds at little enthalpic cost and homogeneous connectivity to the outer bulk-like H-bond network, such that alteration in the network distant from the DNA can regulate the BI-BII transition in a cooperative manner. The water connectivity is disrupted by DNA-binding peptides. Remarkably, the data show that the replacement of hydration shell water upon ligand biding is crucial in conferring substate specific recognition by peptides that have little intrinsic structural preference. The antibacterial peptide indolicidin secreted from bovine neutrophils dehydrates the non-PO2--bound hydration sites, thereby rendering the unstructured peptide highly specific for the BI state with vibrational signature almost identical to the bacterial minor groove binder netropsin. The proposed dominant role of hydration shell water for DNA conformation was challenged by studying the competing effect of structured water in the coordination-shell of the lanthanide Eu3+ on water structure in the DNA hydration shell. Whereas no effect is seen at low hydration, a hydrogen-like phase is formed at a stoichiometric ratio of Eu3+ :DNA:H2O of 1:10:140, characterized by a strong increase of the molar volume of hydration water. This novel phase appears attractive for lanthanide and possibly actine separation approaches based on biomolecular coordination.
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Dobry, Stella Christine. "The Moderating Effect of Attachment Behaviors on the Association Between Video Game Use, Time Together as a Problem, and Relationship Quality." BYU ScholarsArchive, 2015. https://scholarsarchive.byu.edu/etd/5931.
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The purpose of this study was to test whether video game use is associated with more problems with spending time together among married couples, whether problems with time together are associated with relationship quality, and whether attachment behaviors can moderate the association between time together as a problem and relationship quality. Previous studies have found a negative association between excessive video game use and couple relationship outcomes. Excessive video game use may negatively impact relationships by taking away from time spent on shared leisure and relationship maintenance activities. The Double ABCx model provided a theoretical framework for understanding how attachment behaviors such as accessibility, responsiveness, and engagement may act as protective factors that buffer the stress created by video game use and perceiving time together as a problem on couple relationships. A sample of 415 married couples who took the Relationship Evaluation Questionnaire between 2011 and 2013 and indicated that one or both partners played video games was used. Results indicated that there was a negative indirect effect of women's sports and music game use on women's relationship quality via women's reports of time together as a problem in the relationship. There was also a positive indirect effect of women's exercise game use on relationship quality. There was also a negative association between men's and women's reports of time together as a problem on own relationship quality. Men's attachment behaviors moderated the association between women's reports of time together as a problem and women's relationship quality. Clinical implications include more thoroughly assessing why video game use may be a problem in the relationship and fostering healthy attachment behaviors.
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Bailey-Rodriguez, Deborah. ""We're both in the trenches together" : a pluralistic exploration of attachment behaviour dynamics in a heterosexual couple relationship across the transition to second-time parenthood." Thesis, Middlesex University, 2018. http://eprints.mdx.ac.uk/25870/.
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Attachment theory provides a framework for categorising behaviours in close relationships by individuals during times of stress. Attachment behaviours are commonly thought to be determined in early childhood experiences and assumed to hold through to adulthood. Further, these behaviours become particularly salient across life events, such as the transition to parenthood. Attachment styles range from security-based, in which individuals seek to alleviate distress by seeking and receiving proximity to an attachment figure, to insecurity-based styles in which attachment figures are viewed as insufficiently available. These styles have been identified primarily through the use of quantitative methods. However, this risks reducing the intricacy of relational behaviours to discrete and exclusive styles. The use of qualitative methods offers one way to preserve the complexity of relational experiences but there are a limited amount of studies which use this approach. The use of pluralistic qualitative methods allows for more holistic insight by viewing the complexities of attachment from multi-dimensional perspectives and is the methodological focus of this study. The research presents a longitudinal single case study which explores the attachment behaviours of a couple during their transition to second-time parenthood. It uses multiple methods of data collection, including individual semi-structured interviews to gather accounts of experience, diaries to gather accounts of everyday practices and behaviours, and joint unstructured interviews to gather collaborative accounts of the couple relationship. Narrative analysis is used to understand how identities are formed and reformed over the longitudinal period, and gives insight to how the participants make sense of their feelings and emotions. A psycho-social reading of the data enables understanding of some of the internal and external conflicts that the participants negotiate during this period. The plurality of epistemological and ontological paradigms brought by the different methods highlights the complex variation and intricate manners in which the couple's emotion regulation strategies affect the dynamics of their relationship. Key findings of the research illustrate that individuals engage with a variety of attachment behaviours at any given point suggesting that attachment is not a fixed feature; attachment history becomes more salient after the transition to second-time parenthood; insecure attachment behaviours (mainly avoidant ones) tend to be more marked; relationship satisfaction decreases following the birth of the second child; and the parenting relationship becomes the couple relationship after the birth of the second child. The research shows how pluralistic methods challenge traditional views of attachment as fixed and brings new insight to relational experiences by considering them as fluid and dynamic processes, informed by context, subjective meaning-making and external events across the transition to second-time parenthood.
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Blödt, Martin. "Condition Monitoring of Mechanical Faults in Variable Speed Induction Motor Drives - Application of Stator Current Time-FrequencyAnalysis and Parameter Estimation." Phd thesis, Institut National Polytechnique de Toulouse - INPT, 2006. http://tel.archives-ouvertes.fr/tel-00105482.
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Ce travail de thèse traite de la détection et du diagnostic de défaillances mécaniques par analyse du courant statorique dans les entraînements électriques à base de machine asynchrone. Deux effets d'un défaut mécanique, des oscillations de couple et une excentricité d'entrefer, sont supposés. La modélisation par approche des ondes de forces magnétomotrices et de perméance conduit à deux modèles analytiques du signal courant. La conséquence des défauts est soit une modulation de phase, soit une modulation d'amplitude du signal courant statorique. Ces phénomènes sont détectés par une analyse spectrale en régime permanent, ou des méthodes temps fréquence en régime transitoire. Les méthodes étudiées sont la fréquence instantanée, le spectrogramme et la représentation de Wigner-Ville. L'estimation paramétrique d'indices de modulation a également été traitée. Des résultats de simulation et expérimentaux permettent de valider les signatures et d'extraire de façon automatique des indicateurs de défaut. De plus, une méthode permettant la distinction des oscillations de couple d'une excentricité dynamique est proposée. L'étude est complétée par une implémentation sur DSP des méthodes temps-fréquence afin de démontrer la faisabilité d'une surveillance en ligne.
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Khesbak, Hassan Verfasser], Petra [Akademischer Betreuer] [Schwille, and Michael [Akademischer Betreuer] Mertig. "Time-resolved HYDRATION-PERTURBATION-FTIR spectroscopy: A new method to identify water H-bond networks that couple hydration to DNA conformation / Hassan Khesbak. Gutachter: Petra Schwille ; Michael Mertig. Betreuer: Petra Schwille." Dresden : Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2011. http://d-nb.info/1067729356/34.
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Khesbak, Hassan [Verfasser], Petra [Akademischer Betreuer] Schwille, and Michael [Akademischer Betreuer] Mertig. "Time-resolved HYDRATION-PERTURBATION-FTIR spectroscopy: A new method to identify water H-bond networks that couple hydration to DNA conformation / Hassan Khesbak. Gutachter: Petra Schwille ; Michael Mertig. Betreuer: Petra Schwille." Dresden : Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2011. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-78111.
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Pellegrini, Laurence. "Les activités du « couple » Valéry Giscard d’Estaing-Helmut Schmidt après 1981/82 : L’entente personnelle au service de l’Union monétaire de l’Europe." Thesis, Aix-Marseille, 2013. http://www.theses.fr/2013AIXM3046/document.
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La présente thèse de doctorat décrit comment la construction européenne, point de confluence de la démarche politique de Valéry Giscard d'Estaing et d'Helmut Schmidt, a déterminé la poursuite de leur collaboration après 1981/82. Dans ce but, elle se focalise sur les travaux du Comité pour l'Union monétaire de l'Europe, créé à l'initiative de Valéry Giscard d'Estaing et d'Helmut Schmidt en 1986, au lendemain de l'adoption de l'Acte unique européen par leurs successeurs. Quel rôle leur initiative a-t-elle joué sur la constitution du Comité Delors en 1988, chargé d'étudier le projet d'Union économique et monétaire de l'Europe, et, plus largement, sur la mise en oeuvre du traité de Maastricht ? L'analyse, en replaçant la conception européenne de Valéry Giscard d'Estaing et d'Helmut Schmidt dans les débats des années 1980 et 1990 entre approches institutionnalistes et intégrationnistes, économistes et monétaristes, keynésianistes et ordolibérales, ou encore françaises et allemandes, met à jour les enjeux du lobbyisme et de l'intégration économique dans le processus de construction européenneThe present dissertation describe how the construction of Europe, point of confluence of the political measure of Valery Giscard d'Estaing and Helmut Schmidt, was determinant in the pursuit of their collaboration after 1981/82. In this goal it is focussing on the works of the Comity for Monetary union of Europe, created by Valery Giscard d'Estaing and Helmut Schmidt in 1986, before the adoption of the Single European Act by their successors. What role their initiative did played on the constitution of the Delors Comity in 1988, charged to study the project of Economic and Monetary Union of Europe and more widly on the execution of the Maastricht Treaty? The analysis, with the replacement of the European concept of Valery Giscard d'Estaing and Helmut Schmidt in the beginning of the years 1980 and 1990between the approaches institutionalist and integrationist, economist and monetist, keynesianist and ordoliberal, or French and German , reveal the issues of the lobbyist and the economical integration in the process of the construction of Europe
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Casini, Elisa. "Le sommeil : une enjeu pour les couples confrontés aux maladies neuro dégénératives." Thesis, Lille 3, 2017. http://www.theses.fr/2017LIL30016/document.
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Cette thèse de sociologie porte sur les pratiques de sommeil des couples vieillissants confrontés à une maladie neurodégénérative. Elle se fixe comme objectif de saisir les dynamiques temporelles et spatiales de ces pratiques de sommeil, centrales dans la vie du couple, au fil de l'évolution de la maladie en accordant une attention particulière aux relations de genre. Nous avons interviewé 30 couples à domicile, dont 12 concernés par la maladie à corps de Lewy et 18 par la maladie d'Alzheimer et nous avons intégré des dispositifs d'enquête tels que la rédaction de journaux de sommeil, de journaux audio et la constitution d'un ensemble de documentation photographique. L'analyse se déploie selon trois axes. Le premier axe consiste à analyser le rôle du veilleur de nuit assumé par le conjoint aidant. Nous avons constaté le passage du statut de conjoint dormant à celui de "conjoint veilleur". Le rôle de conjoint veilleur est caractérisé par la production d'un travail domestique de soin qui se déroule la nuit et que nous avons appelé "travail domestique nocturne de soin". Nos résultats montrent que ce travail domestique nocturne peut amener le conjoint veilleur à un état d'épuisement qui peut pousser au choix d'institutionnaliser son conjoint malade. Ce travail domestique s'articule avec un état d'inquiétude nocturne du conjoint veilleur qui engendre un sommeil spécifique que l'on peut qualifier de "sommeil en état d'alerte". Il est aussi doublement invisible : il est constitué par des activités se déroulant la nuit et il repose souvent sur les femmes. Le deuxième axe consiste à analyser l'impact de la maladie et des troubles cognitifs sur l'organisation des espaces liés au sommeil en mettant en lumière les négociations qui se font autour de la chambre conjugale. Nous avons dégagé les raisons pour lesquelles une partie des conjoints reste attachée au fait de dormir ensemble. Nous avons aussi analysé les dimensions corporelles liées au partage du lit, contexte où la relation entre les corps trouve son expression privilégiée. Nous avons exploré les expériences de distanciation des conjoints : les significations et les pratiques autour du choix de dormir en couple mais séparés, de faire chambre à part. Le dernier axe porte sur l'analyse des stratégies hétérogènes de la gestion du sommeil telles que l'utilisation des médicaments pour dormir, le recours à la garde nocturne en institution ou au domicile et, enfin, le sommeil diurne. Nous avons analysé les raisons de l'adhésion ou du refus de la part des conjoints aidants et nous avons constaté que la vulnérabilité qui caractérise la nuit et le sommeil peut rendre difficile le recours aux stratégies de gestion du sommeilThis doctoral dissertation in sociology examines the sleep practices of ageing couples confronted with neuro-degenerative conditions. It aims to understand the time- and space-related aspects of these sleep practices, so central to couples’ lives, throughout the different stages of illness, and places particular emphasis on gender-based relations. Thirty couples were interviewed in their homes, 12 of whom were affected by Lewy Body Dementia and 18 by Alzheimer’s Disease. Empirical methods such as sleep journals, audio journals, and photographic documentation were incorporated into the study’s methodology. The study is divided into three branches. The first branch examines the role of “night-time guardian” assumed by the caregiving partner. The author was able to observe that a shift takes place from the status of sleeping partner to that of night-time caregiver. The role of the “night-time guardian” is characterized by domestic labor that takes the form of caregiving provided at night, a phenomenon the author calls “nocturnal domestic caregiving work”. The findings of the study show that this domestic night-time work can bring about a state of exhaustion in caregiving partners that can drive them to institutionalize the partner suffering from a medical condition. In addition to this domestic work, caregiving partners are prone to a state of night-time worry that results in a specific variety of sleep that can be described as “alert sleep”. This domestic work also goes largely unseen for two reasons: it is made up of activities that take place at night, and it often falls to women. The study's second branch offers an analysis of the impact of illness and cognitive disorders on the way areas of the home associated with sleep are organized, bringing to light the give-and-take that occurs where the marital bedroom is concerned. The author examined the reasons some sleep partners continue to insist on sleeping together. Also addressed are the bodily aspects of shared beds, a special context in which the bonds shared between bodies can be expressed in a unique way. The dissertation further explores the experience of placing distance between sleep partners: the meanings and practices surrounding the decision to sleep as a couple but in separate rooms. The final branch of the study examines a range of strategies used to manage sleep, such as taking sleeping medication, turning to in-home or institutional night-time caretaking, and day-time sleep. The author surveyed the reasons that caregiving partners accepted or refused to utilize these strategies, and the study’s findings show that the vulnerability represented by night and sleep can render it difficult to decide to use strategies to manage sleep
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Auger, Fanny. "L'aménagement de l'habitat chez des couples de nouveaux retraités Baby-Boomers : vivre le présent, anticiper l'avenir ?" Thesis, Lille 3, 2016. http://www.theses.fr/2016LIL30032/document.
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Cette thèse de sociologie qualitative porte sur les pratiques et les significations des aménagements de l’habitat chez des couples d’individus nouvellement retraités et issus du « Baby-Boom ». Elle rend compte des dynamiques - socio-historiques, identitaires et corporelles, relationnelles et de mode de vie - qui modèlent l’expérience du « vieillir » et de l’ « habiter » de ces individus, et ce, dans une double temporalité : dans le temps présent, à travers les aménagements réalisés et/ou projetés à court terme ; dans l’avenir, à travers les aménagements réalisés par anticipation des risques liés à la vieillesse et/ou projetés à long terme. Les résultats de cette thèse montrent, d’une part, que les aménagements de l’habitat et leurs pratiques afférentes constituent les « supports » d’une transition dans le parcours de vie, pour des « êtres vieillissants sans être vieux » qui arrivent à la retraite et en même temps, au dernier tiers de leur vie. Dans le même mouvement, ils montrent comment les liens et les activités diverses de « pivots générationnels » nouvellement retraités façonnent leur habitat et leur façon d’habiter en début de retraite. D’autre part, les résultats de cette thèse donnent à voir une approche « endogène » de l’adaptation de l’habitat, à l’heure où cette question constitue un enjeu essentiel pour les pouvoirs publics et pour les individus. Cette recherche montre sur ce point comment des Baby-Boomers font preuve, via l’aménagement de leur habitat, d’un empowerment notable au sujet de leur vieillissement présent et à venir, afin de vivre et de vieillir « bien » et si possible, chez eux. Les résultats exposés donnent aussi à penser le potentiel du « confort » pour accompagner les individus issus des générations du Baby-Boom dans la prévention des risques de l’avenir et la préparation de leur vieux jours. En même temps, cette recherche invite à réfléchir à certains freins liés aujourd’hui (encore) à ces questions, tels qu’un imaginaire de la vieillesse profondément négatif, que certaines images et messages véhiculés continuent de nourrirThis thesis of qualitative sociology is about practices and meanings of home’s adaptations made by newly retired couples of Baby Boomers. It reports various dynamics – sociological, historical, physical or of identity, relationship and lifestyle - that shape the experience of "ageing" and the "housing" of these individuals, and this in two different time frames : in the present, through realized and /or short-term planned developments; in the future, through the developments made by anticipation of risks linked to the ageing and/or long-term projection. The results of this thesis show, first of all, that the adaptation of housing and related practices constitute some "supports" for this transition in the life course, and for "ageing but not old yet” people coming to retirement and entering the “last third of their life”. In the same time, they show how the relationships and the various activities of newly retired "generational pillars" shape their habitat and way of living in the early retirement period. On the other hand, the results of this thesis give to see an "endogenous" approach to adaptation of housing, at a time when this issue is a major challenge for governments and individuals. Regarding this point of view, this research demonstrates how Baby Boomers show, through the development of their habitat, a significant empowerment about their present and future ageing in order to live and age "good" and if possible, at home. The exposed results also suggest the potential of "comfort" in order to help Baby Boomers in the process of risk’s prevention, for the future and the preparation of their old years. At the same time, this research encourages to think about the obstacles that still exist on these questions, such as the deep negative perception of aging, that certain popular images and messages continue to feed
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Mahadevan, Vijay Subramaniam. "Nonlinearly consistent schemes for coupled problems in reactor analysis." Texas A&M University, 2006. http://hdl.handle.net/1969.1/5000.
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Conventional coupling paradigms used nowadays to couple various physics
components in reactor analysis problems can be inconsistent in their treatment of the
nonlinear terms. This leads to usage of smaller time steps to maintain stability and
accuracy requirements thereby increasing the computational time. These inconsistencies
can be overcome using better approximations to the nonlinear operator in a time stepping
strategy to regain the lost accuracy.
This research aims at finding remedies that provide consistent coupling and time
stepping strategies with good stability properties and higher orders of accuracy.
Consistent coupling strategies, namely predictive and accelerated methods, were
introduced for several reactor transient accident problems and the performance was
analyzed for a 0-D and 1-D model. The results indicate that consistent approximations
can be made to enhance the overall accuracy in conventional codes with such simple nonintrusive
techniques.
A detailed analysis of a monoblock coupling strategy using time adaptation was also
implemented for several higher order Implicit Runge-Kutta (IRK) schemes. The
conclusion from the results indicate that adaptive time stepping provided better accuracy
and reliability in the solution fields than constant stepping methods even during
discontinuities in the transients. Also, the computational and the total memory
requirements for such schemes make them attractive alternatives to be used for
conventional coupling codes.
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Glekas, D. "Time division multiplexing on a star coupled fibre optic network." Thesis, University of Kent, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.375965.
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Fairhurst, Peter. "Towards a real-time tightly coupled GPS/INS positioning system." Thesis, University of Newcastle Upon Tyne, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.446192.
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Weber, Christopher. "Real-time studies of coupled molecular switches in photoresponsive materials." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät, 2015. http://dx.doi.org/10.18452/17401.
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Künstliche molekulare Schalter, wie beispielsweise Azobenzole, Diarylethene, Fulgide, Stilbene oder Spiropyrane wurden in den letzten Jahren intensiv erforscht, da sie zur Datenspeicherung, in selbstheilenden Materialien, molekularer Elektronik, Energiespeichern und mikromechanischen Anwendungen eingesetzt werden können. Eine der größten Herausforderungen im Forschungsfeld der molekularen Schalter ist die Frage, wie die Photoreaktion isolierter Moleküle in eine kontrollierte Photoreaktion wohldefinierter supramolekularer Systeme, wie z.B. organischer Dünnfilme oder 3D Nanostrukturen, übersetzt werden kann. Die Integration molekularer Schalter, beispielsweise von Azobenzolen, in supramolekulare Anordnungen kann zu emergenten Phänomenen wie kooperativem Schaltverhalten führen. Kooperatives Schalten bedeutet, dass die energetische Landschaft und daher auch die Isomerisationskinetik eines einzelnen molekularen Schalters von den isomerischen Zuständen benachbarter Schalter beeinflusst werden. Kooperatives Schaltverhalten, oder überhaupt Schaltbarkeit in geordneten Ensembles molekularer Schalter auf Oberflächen bewusst zu erzeugen hat sich allerdings aufgrund von sterischer Behinderung oder Delokalisierung angeregter Zustände als schwierig herausgestellt. Deshalb wäre ein besseres Verständnis der Voraussetzungen für Schaltbarkeit und kooperatives Verhalten molekularer Schalter in supramolekularen Systemen ein großer Schritt in Hinblick auf die Entwicklung von Bauelementen, die auf der gemeinsamen Bewegung molekularer Schalter basieren. Die in dieser Arbeit erzielten Resultate gewähren neue Einblicke in das Verhältnis zwischen der Photoisomerisierung einzelner Azobenzole und der Photoreaktion supramolekularer Systeme, was dabei helfen wird, neuartige und optimierte stimulireaktive Materialien zu entwickeln.Synthetic molecular switches, such as azobenzenes, diarylethenes, fulgides, stilbenes or spiropyranes, have been intensively investigated in recent times because of their possible use in data storage, self-healing materials, molecular electronics, energy and information storage and optomechanics. One of the biggest challenges in the research field of molecular switches is the translation of the photoresponse of isolated molecules into a controlled photoresponse of well-defined supramolecular systems, such as organic thin films or functional nanostructures. The main focus of this thesis lies on the photoisomerization of multi-azobenzene compounds in different structural environments. Incorporation of molecular switches, for example azobenzene, into supramolecular assemblies can lead to emergent phenomena like cooperative switching behavior. Cooperative switching means that the energetic landscape and thus also the isomerization kinetics of a single molecular switch is influenced by the isomeric state of adjacent switches. However, it has proven difficult to establish cooperative switching behavior or even switching functionality at all in ordered ensembles of molecular switches on surfaces due to steric hindrance or delocalisation of excited states. Therefore, understanding the prerequisites for switching functionality and cooperative behavior of molecular switches in supramolecular assemblies is a crucial step towards the development of devices that make use of concerted motion of molecular switches. This thesis yields unprecedented insight into the relation between the photoisomerization of isolated azobenzenes and the photoresponse of supramolecular systems, which will ultimately help to build novel and optimized stimuli-responsive materials.
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Yao, Conglun. "Strongly typed, compile-time safe and loosely coupled data persistence." Thesis, University of Birmingham, 2010. http://etheses.bham.ac.uk//id/eprint/1186/.
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A large number of approaches have been developed to simplify construction of, and to reduce errors in, data-driven applications. However, these approaches have not been particularly concerned with compile-time type safety. Type mismatch errors between program and the database schema occur quite often during program development, and the techniques used in these approaches often defer error checking on database operations until runtime. In this thesis, we take a different approach from those previously proposed, based on strict type checking at compile time, type inference, higher-order functions, phantom types, object relational mapping, and loosely coupled database interaction. Instead of using external, literal XML file and string type SQL, we embed the mapping meta data and user defined queries directly in the program, the type safety of which is guaranteed by the program compiler. Such a result is achieved by introducing additional database schema information and using type avatars, a dummy structure used to extend the type checking to embedded queries, during compilation. We show that this approach is practical and effective by implementing a compile-time type-safe object relational framework, called Qanat, in the OCaml programming language and using a loosely coupled SQL database. We further report experimental results obtained by running a number of benchmark tests, and compare the resulting Qanat applications with the equivalent, raw database driver based applications.
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Chirputkar, Shardool U. "Coupled Atomistic-Continuum Simulation Using Enriched Space-Time Finite Elements." University of Cincinnati / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1163773301.
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Lui, Kwok-on, and 呂國安. "Single particle analysis by time-resolved ICP-MS measurement." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2011. http://hub.hku.hk/bib/B46582630.
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Fernandes, Aurelio. "Time multigrid methods and D-adaptivity for coupled fluid flow solvers." Thesis, Cranfield University, 2002. http://hdl.handle.net/1826/3519.
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This Thesis is about the application of coupled multigrid solvers to the numeri-
cal simulation of viscous incompressible fluids. In the centre of discussion is the
adaptivity between a one-dimensional solver and a two-dimensional one.
The methodology used has proved highly successful for single-and multi-phase
laminar flows, leading to solution algorithms that are robust, efficient and accu-
rate. The solvers presented here required a considerable number of algorithmic
developments. Some of them have demanded the use of some well-known software
packages.
The Thesis outline is as follows: firstly, the modelling of transient single-phase
and multi-phase flows is reviewed, together with a brief overview of the numerical
schemes and multigrid methods used in the solvers. Secondly, the Navier-Stokes
governing equations are presented and the space discretization formulas based on
a control volume are formulated. After having specified the solution algorithms we
present results for each solver for a set of test cases of varying complexity. Com-
parison with our reference commercial code is outlined, showing good agreement
in the results.
Interpolation transfer operators used in the interface between the one-dimensional
solver and the two-dimensional one are addressed. The coupled solvers are then
applied on the numerical simulation of the transient flows on two complex multi-
domain problems. Comparison results with the two-dimensional solvers have been
performed.
The question of performance and accuracy is addressed in detail, both in terms
of robustness and speed of convergence. Good accelerations are obtained using the
coupled solver. The CPU-time spent to reach the expected steady-state solution is
about ten to thirty five percent of the equivalent two-dimensional solver.
Considerable gains in memory usage have been achieved. The robustness has
been easily verified in the comparison process with the two-dimensional transient
solvers. Analytic solutions have been formulated and discussed.
However some dependence on the Reynolds numbers has been observed. This
was due to the geometric constraints of the complex test cases and the change of
some fluid properties.
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Koeniger, Stormy Lee Ann. "Multidimensional ion mobility spectrometry coupled to time-of-flight mass spectrometry." [Bloomington, Ind.] : Indiana University, 2006. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3230539.
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Thesis (Ph. D.)--Indiana University, Dept. of Chemistry, 2006.Title from PDF t.p. (viewed Nov. 5, 2008). Source: Dissertation Abstracts International, Volume: 67-08, Section: B, page: 4395. Adviser: David E. Clemmer.
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Bowerbank, Christopher Ryan. "Comprehensive Isotachophoresis-Capillary Electrophoresis Coupled to Time-of-Flight Mass Spectrometry." BYU ScholarsArchive, 2001. https://scholarsarchive.byu.edu/etd/6084.
Full textAbstract:
Isotachophoresis (ITP) coupled to capillary zone electrophoresis (CE) in a comprehensive manner was used to separate mixture components in both insufficient and sufficient concentrations without heart-cutting or splitting. Examples of comprehensive ITP-CE involving multiple CE injections of preconcentrated ITP zones are demonstrated. In the comprehensive arrangement, all of the sample in the first dimension (ITP) is subjected to analysis in the second dimension (CE), without significant sample loss or decrease in sample detectability resulting from removal of a portion of the sample. This is especially important for analytes at low concentrations which may form a single mixed zone instead of individual ITP zones. Direct online coupling of ITP to CE in this comprehensive arrangement involved the use of columns having different diameters with one directly inserted inside the other. A counterflow was applied when the isotachophoretic sample stack reached the bifurcation point. Large volume (10 µL) injections were made using an electrically-insulated commercial polymeric rotary valve injector for increased reproducibility compared to previous comprehensive ITP-CE studies, with ITP and CE retention time RSD values ranging from 2-5%. An ultraviolet (UV) detector positioned at the bifurcation point was used to determine the beginning of CE injection. Application of a splitting voltage at the bifurcation point showed no affect on analyte transfer into the CE column. By using multiple injections of the ITP band(s), CE column overloading was not observed.
Online capillary isotachophoresis (ITP) and comprehensive isotachophoresis-capillary electrophoresis (ITP-CE) were also coupled with electrospray ionization (ESI)-orthogonal acceleration time-of-flight mass spectrometry (TOFMS). Separations were performed using 200 µm I.D. and 50 µM I.D. polyvinylalcohol (PVA)-coated fused silica capillaries for ITP and CE, respectively. Both ITP and ITP-CE were coupled to TOFMS for analysis of sufficient (10-5 M) and insufficient (10-6-10-7 M) concentrations of angiotensins in mixtures. ITP-TOFMS of a single mixed zone of five angiotensins (3 x 10-7 M) showed that ion suppression due to the co-elution of angiotensin III in the electrospray significantly reduced the ionization of other analytes. A practical solution to the detection difficulties for ITP mixed zones involved the insertion of a CE separation between the ITP and TOFMS for online preconcentration, separation, and identification in one system.
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Elias, Janice Graham. "Time allocation of teaching couples to work, family and personal roles /." The Ohio State University, 1989. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487671640054757.
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Fettro, Marshal Neal. "Men's and Women's Time Use: Comparing Same-Sex and Different-Sex Couples." Bowling Green State University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1530144962678369.
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Zeeb, Steffen [Verfasser], and Wolfgang [Akademischer Betreuer] Kinzel. "Chaos Synchronization in Time-Delayed Coupled Networks / Steffen Zeeb. Betreuer: Wolfgang Kinzel." Würzburg : Universitätsbibliothek der Universität Würzburg, 2013. http://d-nb.info/103731137X/34.
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Karabacak, Ozkan. "Convergence of time averages near statistical attractors and ratcheting of coupled oscillators." Thesis, University of Exeter, 2010. http://hdl.handle.net/10036/117926.
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In this thesis, convergence of time averages near statistical attractors of continuous flows are investigated. A relation between statistical attractor and essential Ω-limit set is proved, and using this a general definition for statistical attractor is given. Sufficient conditions are given for an observable to admit a convergent time average along the orbits of the flow. The general results are applied to flows on a torus, and in particular to systems of coupled phase oscillators that admit attracting heteroclinic networks in their phase space. A particular heteroclinic network that we call heteroclinic ratchet is observed and analysed in detail. Heteroclinic ratchets give rise to a novel phenomenon, unidirectional desynchronization of oscillators (ratcheting). The results obtained about the convergence of time averages near statistical attractors implies that heteroclinic ratchets induce, besides its other interesting consequences, frequency synchronization without phase synchronization. Different coupling structures that can give rise to ratcheting of oscillators are also investigated.
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Chen, Zhiyun. "Coupled space-time discontinuous Galerkin method for dynamical modeling in porous media." Aachen Shaker, 2008. http://d-nb.info/994883005/04.
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Pade, Jan Philipp. "Synchrony and bifurcations in coupled dynamical systems and effects of time delay." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät, 2015. http://dx.doi.org/10.18452/17293.
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Dynamik auf Netzwerken ist ein mathematisches Feld, das in den letzten Jahrzehnten schnell gewachsen ist und Anwendungen in zahlreichen Disziplinen wie z.B. Physik, Biologie und Soziologie findet. Die Funktion vieler Netzwerke hängt von der Fähigkeit ab, die Elemente des Netzwerkes zu synchronisieren. Mit anderen Worten, die Existenz und die transversale Stabilität der synchronen Mannigfaltigkeit sind zentrale Eigenschaften. Erst seit einigen Jahren wird versucht, den verwickelten Zusammenhang zwischen der Kopplungsstruktur und den Stabilitätseigenschaften synchroner Zustände zu verstehen. Genau das ist das zentrale Thema dieser Arbeit. Zunächst präsentiere ich erste Ergebnisse zur Klassifizierung der Kanten eines gerichteten Netzwerks bezüglich ihrer Bedeutung für die Stabilität des synchronen Zustands. Folgend untersuche ich ein komplexes Verzweigungsszenario in einem gerichteten Ring von Stuart-Landau Oszillatoren und zeige, dass das Szenario persistent ist, wenn dem Netzwerk eine schwach gewichtete Kante hinzugefügt wird. Daraufhin untersuche ich synchrone Zustände in Ringen von Phasenoszillatoren die mit Zeitverzögerung gekoppelt sind. Ich bespreche die Koexistenz synchroner Lösungen und analysiere deren Stabilität und Verzweigungen. Weiter zeige ich, dass eine Zeitverschiebung genutzt werden kann, um Muster im Ring zu speichern und wiederzuerkennen. Diese Zeitverschiebung untersuche ich daraufhin für beliebige Kopplungsstrukturen. Ich zeige, dass invariante Mannigfaltigkeiten des Flusses sowie ihre Stabilität unter der Zeitverschiebung erhalten bleiben. Darüber hinaus bestimme ich die minimale Anzahl von Zeitverzögerungen, die gebraucht werden, um das System äquivalent zu beschreiben. Schließlich untersuche ich das auffällige Phänomen eines nichtstetigen Übergangs zu Synchronizität in Klassen großer Zufallsnetzwerke indem ich einen kürzlich eingeführten Zugang zur Beschreibung großer Zufallsnetzwerke auf den Fall zeitverzögerter Kopplungen verallgemeinere.Since a couple of decades, dynamics on networks is a rapidly growing branch of mathematics with applications in various disciplines such as physics, biology or sociology. The functioning of many networks heavily relies on the ability to synchronize the network’s nodes. More precisely, the existence and the transverse stability of the synchronous manifold are essential properties. It was only in the last few years that people tried to understand the entangled relation between the coupling structure of a network, given by a (di-)graph, and the stability properties of synchronous states. This is the central theme of this dissertation. I first present results towards a classification of the links in a directed, diffusive network according to their impact on the stability of synchronization. Then I investigate a complex bifurcation scenario observed in a directed ring of Stuart-Landau oscillators. I show that under the addition of a single weak link, this scenario is persistent. Subsequently, I investigate synchronous patterns in a directed ring of phase oscillators coupled with time delay. I discuss the coexistence of multiple of synchronous solutions and investigate their stability and bifurcations. I apply these results by showing that a certain time-shift transformation can be used in order to employ the ring as a pattern recognition device. Next, I investigate the same time-shift transformation for arbitrary coupling structures in a very general setting. I show that invariant manifolds of the flow together with their stability properties are conserved under the time-shift transformation. Furthermore, I determine the minimal number of delays needed to equivalently describe the system’s dynamics. Finally, I investigate a peculiar phenomenon of non-continuous transition to synchrony observed in certain classes of large random networks, generalizing a recently introduced approach for the description of large random networks to the case of delayed couplings.
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Miller, Brent Adam. "Loosely Coupled Time Integration of Fluid-Thermal-Structural Interactions in Hypersonic Flows." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1429828070.
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Dunsmore, Joel Philip. "The time-domain response of coupled-resonator filters with applications to tuning." Thesis, University of Leeds, 2004. http://etheses.whiterose.ac.uk/3355/.
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This thesis develops a new theory of tuning filters based on the time-domain response of the filter. These methods are shown to work very well for all-pole coupledresonator filters in particular, and may be applied to automated tuning of filters. Numerous filter-tuning methods are reviewed, and the attributes and limitations of each are discussed. Key results about transfer functions, filter theory and Laplace transform theory are reviewed as applied to all-pole filters. The Fourier Transform theory is reviewed and a new, detailed analysis of the Vector Network Analyzer (VNA) time-domain transform, including gating and windowing is presented, including new work in area of the compensation for the masking effects of time-domain gating. A complete description of the time-domain tuning method is presented, which includes experimental and empirical results from simulations and measurements on filters. The theoretical underpinning supporting the novel method of time-domain tuning is developed, along with a rigorous mathematical relationship between VNA timedomain response of a simple filter, and the analytic impulse response. The timedomain results observed in experiments are shown to be directly correlated to the filter transfer functions and the specific effects that differentiate the VNA time-domain transform from the analytically derived impulse response. This thesis includes previously unpublished work that is the basis for two U.S. patents, as well as the development of a commercial filter tuning software program. An improved method for filter tuning, which uses time-domain gating on the S 11 response of the filter is introduced, and shown to be a key improvement for developing automated tuning techniques. The details of a software application for filter tuning are presented, along with methods for determining and compensating the interactions from other resonators. A case study of applying the FTS method to a complex duplex filter is described. Areas for extension into other filter types are discussed. General guidelines for the successful application of the new tuning method to various filter types are presented, along with other conclusions of this thesis.
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Yau, Ho-pan Michael. "Preconcentration of trace metals on nanoparticles for time-resolved ICP-MS measurement." Click to view the E-thesis via HKUTO, 2006. http://sunzi.lib.hku.hk/hkuto/record/B36878790.
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Yau, Ho-pan Michael, and 邱浩斌. "Preconcentration of trace metals on nanoparticles for time-resolved ICP-MS measurement." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2006. http://hub.hku.hk/bib/B36878790.
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Fong, Chung Yan. "Silicon-based laterally waveguide-coupled square microcavity channel add-drop filters /." View abstract or full-text, 2004. http://library.ust.hk/cgi/db/thesis.pl?ELEC%202004%20FONG.
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Thesis (M. Phil.)--Hong Kong University of Science and Technology, 2004.Includes bibliographical references (leaves 98-103). Also available in electronic version. Access restricted to campus users.
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Zhang, Hua, and 张华. "Characterization of signal-production processes of single particles inICP by time-resolved ICP-AES." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2011. http://hub.hku.hk/bib/B47150567.
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The research in this thesis aims to characterize the signal-production processes of single particles in the ICP using time-resolved ICP-AES. Signal-production processes, including desolvation, vaporization, atomization, ionization, and diffusion, determine the temporal emission intensity of a single particle. Bimetallic nanoparticles of BaTiO3 (average diameter = 115 nm) were used as test particles. The particles were introduced into the ICP by nebulization of the suspension of the particles in water. As the ion plume of a particle moves up in central channel of the ICP, a temporal emission peak of the analyte atoms in the plume is produced. The emission intensity at any point of time in the temporal profile is related to the degree of vaporization and excitation of the particle at the corresponding vertical position of the ICP. The signal-production processes can, in principle, be studied by measuring the temporal emission profiles. However, the emission intensity of single particles is typically low. Continuous integration of the entire ICP central channel further reduces the signal-to-background ratio (SBR).
A novel double-slit method has been developed to measure the temporal emission intensity of a single particle at two pre-defined ICP vertical positions. Two horizontal slits of slit height of 1 mm were placed in front of the monochromator. As the ion plume passes through the double-slit, two peaks in the temporal emission profile are produced. The configuration of the double-slit (slit height and distance between the two slits) was optimized for maximum signal-to-noise ratio (SNR) and temporal resolution of the double-peaks.
Fast data sampling rate (50,000 Hz) was used in proper sampling of the temporal emission peaks. Large data sets were obtained. Custom programs were developed to extract the relatively weak double-peaks from the temporal emission profiles. The data treatment strategy includes smoothing of the temporal profile to increase SNR and automated peak extraction based on the characteristics of the double-peaks (peak height, peak width, time-difference of the peak pair, and SNR). Four smoothing methods, including Moving Average Filtering, Savitzky-Golay Filtering, Fast Fourier Transform (FFT) and Wavelet Transform, were tested. FFT was adopted because the method requires only one parameter (the cutoff frequency) and is relatively easy to optimize.
Hundreds of double-peaks were obtained in a typical temporal profile of time duration of approximately 120 s. The emission intensity and peak width of the peak pair are correlated to determine the degree of vaporization of the analyte atoms, the extent of diffusion of the analyte atoms and the plume size, and the velocity of the plume in the ICP. Two types of double-peaks are identified. The relative peak height and peak width of the double-peaks in each type are related to the degree of vaporization of the single particles. Simulation of the evaporation rate of water droplets that enclose the single BaTiO3 particles shows that the time required for complete evaporation of water is a major factor that determines the degree of vaporization of BaTiO3 particles at the double-slit. Aggregation of BaTiO3 particles in the suspension was also investigated.published_or_final_version
Chemistry
Master
Master of Philosophy
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Cramer, Claire E. "A torsion balance search for spin-coupled forces /." Thesis, Connect to this title online; UW restricted, 2007. http://hdl.handle.net/1773/9764.
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Yadav, Pankaj. "Time and thermo-mechanical coupling effects in polymers." Thesis, Montpellier, 2019. http://www.theses.fr/2019MONTS061.
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L'étude du comportement mécanique et thermique des polymères est d'une importance capitale pour les applications techniques. Par conséquent, la capacité de prédire ces propriétés pour des plages étendues de fréquences de sollicitation et de température, est une forte motivation. Sur la base d'une combinaison expérimentale d'analyses rhéologiques mécaniques et thermiques (DMTA), des modèles phénoménologiques sont ainsi développés pour prédire le comportement viscoélastique linéaire des polymères avec l'utilisation traditionnelle du principe dit de "superposition temps-température (TTSP)". Lors de la mise en œuvre de ces modèles, la prise en compte (i) des effets liés à la température réelle de l'échantillon ou (ii) des effets induits par les couplages thermomécaniques n'est pas prise en compte. Cependant, les matériaux polymères sont très sensibles aux variations de température et même de faibles variations de température peuvent engendrées des sources de couplage thermomécanique ou de dissipation non négligeables dans le bilan d’énergie. L'applicabilité du TTSP dans ce contexte mérite d’être revisitée. Ainsi, une connaissance précise du comportement mécanique et thermique de cette classe de matériaux, dans le cadre de la thermodynamique des processus irréversibles, en tenant compte de l'effet dissipatif et du couplage thermomécanique, est nécessaire.Pour atteindre ces objectifs, la présente étude a été réalisée à partir d'une revue de la littérature sur le comportement thermomécanique des polymères vitreux et amorphes et du TTSP. Ensuite, nous avons rappelé le cadre théorique de la thermodynamique des processus irréversibles et sa mise en œuvre dans le formalisme des matériaux standards généralisés (GSM). Ainsi la température pu être considérée comme une variable d'état et les équations comportementales constitutives ont pu être dérivées d'un potentiel thermodynamique et de dissipation. Ce formalisme a également permis de définir puis de calculer les différentes sources de chaleur et la forme globale du bilan d’énergie.Deuxièmement, des mesures ont été effectuées pour caractériser les propriétés viscoélastiques linéaires en dessous de la température de transition vitreuse de certains polymères amorphes et rhéologiquement simples (PS, PMMA et PA-6.6). On a ensuite appliqué un TTSP classique utilisant une loi d'Arrhenius pour prédire le comportement viscoélastique linéaire sur une très large plage de température/fréquence, qui ne peut être atteinte expérimentalement. Une première série de mesures a été effectuée sur PS dans plusieurs laboratoires pour vérifier la réponse monochromatique à une charge monochromatique et construire une base de données de référence pour l'étalonnage et la validation des différentes procédures de correction (rigidité machine et déphasage électronique) de notre DMTA. Par la suite, des mesures thermographiques synchronisées ont été effectuées pour mesurer les variations de température de l'échantillon pendant les mesures DMTA. Ceci permet d'estimer l'énergie mécanique moyenne dissipée pendant un cycle ainsi que les pertes de chaleur et le couplage thermoélastique.Enfin, ces résultats expérimentaux ont été utilisés pour identifier les branches d'un modèle de Maxwell généralisé (MGM) en utilisant la méthode des moindres carrés non négatifs pour les 3 polymères différents. Dans chaque branche de ce modèle, la constante de temps viscoélastique et le module d'élasticité associé dépendent de la température (par une loi d'Arrhenius et une énergie d'activation préalablement déterminée expérimentalement). En utilisant le formalisme GSM, les différentes sources de chaleur (couplages thermomécaniques, dissipation) ont également été calculées. Le bilan énergétique a montré la prédominance des sources de couplages thermomécaniques. Pour conclure cette étude, nous avons montré qu'un MGM supposant l'hypothèse de matériau rhéologiquement simple est compatible avec le TTSPThe study of the mechanical and thermal behaviour of polymers is of prime importance for engineering applications. Therefore, the ability of predicting these properties for several decades of loading frequencies and/or several tens of degree Celsius, is a strong motivation. Based on experimental combination of mechanical and thermal rheological-analysis (DMTA), phenomenological models are thus developed to predict the linear viscoelastic behaviour of polymers with the traditional use of the so-called “time-temperature superposition principle (TTSP)”. While implementing these models, the consideration of (i) effects linked to the real temperature of the sample or of (ii) the time effects induced by thermo-mechanical couplings are not taken into account. However, polymer materials are very sensitive to temperature variations and even slight temperature variations can be due to thermo-mechanical coupling or dissipation sources. The TTSP applicability in such a context is thus not straightforward. Therefore, an accurate knowledge of the mechanical and thermal behaviour of this class of materials, under the Thermodynamics of Irreversible processes, taking into account the dissipative effect and thermo-mechanical coupling, can become of prime importance.To achieve these objectives, the present study was performed starting from a literature review on the thermo-mechanical behaviour of vitreous and amorphous polymers and the TTSP. This was followed by understanding the theoretical framework of thermodynamics of irreversible processes and its implementation in the Generalized Standard Material (GSM) formalism. The theoretical framework of GSM allowed us to consider the temperature as an internal state variable and to derive the constitutive behavioural equations from a thermodynamic and a dissipation potential. This formalism also induced the possibilities to define and then compute the different heat sources involved in the heat diffusion equation.Second, measurements were performed to characterize the linear viscoelastic properties below the glass transition temperature of selected amorphous and rheologically simple polymers (PS, PMMA and PA-6.6). This was followed by the application of a classical TTSP using an Arrhenius law to predict the linear viscoelastic behaviour on a very large temperature/frequency range, which cannot be experimentally reachable. A first set of measurements was performed on PS in several laboratories to check for its monochromatic response to a monochromatic loading and build a reference database for the calibration and validation of different correction procedures (machine stiffness and electronic phase shift) of our DMTA. Later, synchronized thermography measurements were performed to measure the temperature variations of the sample during DMTA measurements. This allows for the estimation of the average mechanical energy dissipated during one cycle together with the heat losses and thermoelastic coupling.Finally, these experimental results were used to identify the optimum branches of a generalized Maxwell model (GMM) using non negative least squares method for the 3 different polymers. In each branch of this model, the viscoelastic time constant and the associated elastic modulus depend on the temperature (through an Arrhenius law and an activation energy determined previously experimentally). Using the GSM formalism, the different heat sources (thermomechanical couplings, dissipation) were also computed. The energy rate balance showed the predominance of the thermomechanical couplings sources. To conclude this study, we stressed that a GMM assuming the rheological simple material hypothesis is TTSP compatible
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Duée, Cédric, Beate Orberger, Nicolas Maubec, Xavier Bourrat, Mendili Yassine El, Stéphanie Gascoin, Daniel Chateigner, et al. "Challenges in coupled on-line-on-mine-real time mineralogical and chemical analyses on drill cores." Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2018. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-231144.
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The SOLSA project aims to develop an innovative on-line-on-mine-real-time expert system, combining sonic drilling, mineralogical and chemical characterization and data treatment. Ideally, this combination, highly demanded by mining and metallurgical companies, will speed up exploration, mining and processing.
In order to evaluate the instrumental parameters for the SOLSA expert system, portable and laboratory analyses have been performed on four samples with contrasting lithologies: siliceous breccia, serpentinized harzburgite, sandstone and granite. More precisely, we evaluated the influence of the surface state of the sample on the signals obtained by portable X-Ray Fluorescence (pXRF) for chemistry and portable Infra-Red spectroscopy (pIR) for mineralogy. In addition, laboratory Raman spectroscopy, X-Ray Diffraction (XRD), XRF and ICP-OES laboratory analyses were performed to compare surface bulk mineralogical and chemical analyses.
This presentation highlights (1) the importance of coupling chemical and mineralogical analytical technologies to obtain most complete information on samples, (2) the effect of the sample surface state on the XRF and IR signals from portable instruments. The last point is crucial for combined instrumental on-line sensor design and the calibration of the different instruments, especially in the case of pXRF.
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Schöps, Sebastian [Verfasser]. "Multiscale Modeling and Multirate Time-Integration of Field/Circuit Coupled Problems / Sebastian Schöps." Wuppertal : Universitätsbibliothek Wuppertal, 2011. http://d-nb.info/1013799690/34.
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Polomeno, Viola. "First-time parenting couples' stress associated with at-risk pregnancy and antenatal hospitalization." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/NQ65326.pdf.
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Buckley, Rhonda Renee. "The relationships between conflict, marital satisfaction and couples' time spent in joint activity." Auburn, Ala., 2005. http://repo.lib.auburn.edu/2005%20Fall/Dissertation/BUCKLEY_RHONDA_27.pdf.
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Netuzhylov, Hennadiy. "A space-time meshfree collocation method for coupled problems on irregularly-shaped domains." Braunschweig : CSE, Computational Sciences in Engineering, Techn. Univ, 2009. http://d-nb.info/994492537/34.
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Kim, Hyunsoon. "Coupled Adjoint-based Sensitivity Analysis using a FSI Method in Time Spectral Form." Diss., Virginia Tech, 2019. http://hdl.handle.net/10919/94132.
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A time spectral and coupled adjoint based sensitivity analysis of rotor blade is carried out in this study. The time spectral method is an efficient technique to solve unsteady periodic problems by transforming unsteady equation of motion to a steady state one. Due to the availability of the governing equations in the steady form, the steady form of the adjoint equations can be applied for the sensitivity analysis of the coupled fluid-structure system. An expensive computational time and memory requirement for the unsteady adjoint sensitivity analysis is thus avoided. A coupled analysis of fluid, structural, and flight dynamics is carried out through a CFD/CSD/CA coupling procedure that combines FSI analysis with enforced trim condition. Coupled sensitivity analysis results and their validations are presented and compared with aerodynamics only sensitivity analysis results. The fluid-structure coupled adjoint based sensitivity analysis will be applied to the shape optimization of a rotor blade in the future work. Minimization of required power is the objective of the optimization problem with constraints on thrust and drag of the rotor. The bump functions are considered as the design variables. Rotor blade shape changes are obtained by using the bump function on the surface of the airfoil sections along the span.Doctor of Philosophy
The work in this dissertation is motivated by the reducing the computational cost at the early design stage with guaranteed accuracy. In the research, the author proposes that the goal can be achieve through coupled adjoint based sensitivity analysis using a fluid structure interaction in time spectral form. Adjoint based sensitivity analysis is very efficient for solving design problems with a large number of design variables. The time spectral approach is used to overcome inefficient calculation of rotor flows by expressing flow and structural state variables as Fourier series with small number of harmonics. The accuracy and the efficiency of flow solver are examined by simulating UH-60A forward flight condition. A significant reduction in the computational cost is achieved by its Fourier series form of the periodic time response and the assumption of periodic steady state. A good agreement between time accurate and time spectral analysis is noted for the high speed forward flight condition of UH-60A configuration. Prediction from both methods also agree quite well with the experimental data. The adjoint based sensitivity analysis results are compared with the finite difference sensitivity analysis results. Even with presence of small discrepancies, these two results show a good agreement to each other. Coupled sensitivity analysis includes not only the effect of fluid state changes but also the contribution of structural deformation.
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Abdul, Rahman Rafiduraida. "The theory and practice of couples managing two full-time careers in Malaysia." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/the-theory-and-practice-of-couples-managing-two-fulltime-careers-in-malaysia(d1df32a9-56c4-44e0-8e05-f4897aca4710).html.
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This thesis investigates the experiences of Malaysian dual-career couples combining career and family. Semi-structured qualitative interviews were used to collect data from 23 dual-career couples. The findings indicate that being in a dual-career relationship impacts upon how they perceive the family’s provider role; career priorities; how decisions are made; and how family work is divided. The experiences described by the participants reflect their gender role ideologies and the salience of family and work roles. The results also reveal how interaction between partners can shape their ideologies and role salience, in addition to how religious and cultural values influence their gender attitudes. A number of challenges faced by the couples are identified. The supports and strategies that help them cope with housework, childcare and work demands are also critiqued. The thesis also highlights the implications of the government and organization’s policies and support to the couples and the kind of policies and support that the couples would like to see introduced. The similarities and differences between dual-career couples in the Malaysian context compared with the West are explored. Additionally, the findings extend the use of gender role ideology and role salience theories to develop an understanding of the couples’ experiences. A summarizing framework of their experiences based on the analysis is presented. In summary, the thesis firstly fills a gap in the dual-career couples’ literature which has previously focused upon Western couples only. Secondly, the study has examines the utility of gender role ideology and role salience as a framework to understand the context of dual-career couples. Thirdly, the current research also makes an important methodological contribution in a Malaysian context. Finally, it provides some recommendations for the government and organizations in Malaysia in terms of policies that promote work-family balance and gender equality for dual-career women.
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Munn, Richard J. "Salvation Army married officer leadership for such a time as this /." Online full text .pdf document, available to Fuller patrons only, 2004. http://www.tren.com.
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Edsall, Judith E. "Time allocation, clergy wife role, and marital satisfaction among priests and wives in an Episcopal diocese." Gainesville, FL, 1986. http://www.archive.org/details/timeallocationcl00edsa.
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