Dissertations / Theses on the topic 'Theoretical Model'
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Regular, Melvin M. "A theoretical model of curriculum planning." Thesis, University of Ottawa (Canada), 1989. http://hdl.handle.net/10393/5776.
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Schaupp, Ludwig Christian. "Website Success: An Integrated Theoretical Model." Diss., Virginia Tech, 2005. http://hdl.handle.net/10919/27418.
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As evidenced by the sheer number of websites presently on the Internet and the exorbitant amount of dollars that are spent on maintaining corporate websites determining the successfulness of these websites is of the utmost importance. In building a successful website the design must match the organizationâ s objectives and these objectives need to be clearly defined. However, the objectives of a website differ depending upon the website type. As a result, from the user perspective, this results in varying ideas of satisfaction as well as success. Thus, from the user perspective determining success across websites is both goal and context specific. This dissertation investigated five variables which were believed to impact website satisfaction: information quality, system quality, perceived effectiveness, social influence, and trust. Theories in information systems success and information technology adoption provided theoretical foundations for this dissertation. The research was conducted by surveying multiple respondents, who were regular users of two different websites, each fitting into a different category within the taxonomy of websites. Structural equation modeling techniques were used to build the models of determinants of satisfaction for each website. The research results indicate that depending upon the type of website being evaluated different determinants of satisfaction were present. Four variables were found to be significant determinants of website satisfaction in the online community website: information quality, perceived effectiveness, social influence, and trust. However, in the information specific search website only three variables were found to significantly predict website satisfaction: information quality, system quality, and perceived effectiveness. Thus, this dissertation has shown that website usersâ determinants of satisfaction and overall successfulness is dependent upon the context of the website being evaluated and that determinants of satisfaction are goal specific. Several contributions were made by this study. In particular, this research is one of the first to empirically measure determinants of satisfaction, from the user perspective, in varying website contexts.Ph. D.
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MUSTAFA, MUHAMMAD SALMAN. "A Theoretical Model of Lean warehousing." Doctoral thesis, Politecnico di Torino, 2015. http://hdl.handle.net/11583/2588573.
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Udtaisuk, Dneya Bunnag. "A theoretical model of piano sightplaying components." Diss., Columbia, Mo. : University of Missouri-Columbia, 2005. http://hdl.handle.net/10355/4123.
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Thesis (Ph. D.)--University of Missouri-Columbia, 2005.The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file viewed on (May 25, 2006) Vita. Includes bibliographical references.
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Baker, Gregory G. "Caches in a theoretical model of multicasting." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape3/PQDD_0010/MQ61405.pdf.
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Smith, Victoria Emma. "Theoretical studies of the periodic Anderson model." Thesis, University of Oxford, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.400249.
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Cleghorn, Christopher Wesley. "A Generalized theoretical deterministic particle swarm model." Diss., University of Pretoria, 2013. http://hdl.handle.net/2263/33333.
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Particle swarm optimization (PSO) is a well known population-based search algorithm,
originally developed by Kennedy and Eberhart in 1995. The PSO has been utilized
in a variety of application domains, providing a wealth of empirical evidence for its
effectiveness as an optimizer. The PSO itself has undergone many alterations subsequent
to its inception, some of which are fundamental to the PSO's core behavior, others have
been more application specific. The fundamental alterations to the PSO have to a large
extent been a result of theoretical analysis of the PSO's particle's long term trajectory.
The most obvious example, is the need for velocity clamping in the original PSO. While
there were empirical fndings that suggested that each particle's velocity was increasing
at a rapid rate, it was only once a solid theoretical study was performed that the reason
for the velocity explosion was understood. There has been a large amount of theoretical
research done on the PSO, both for the deterministic model, and more recently for the
stochastic model.
This thesis presents an extension to the theoretical deterministic PSO model. Under the
extended model, conditions for particle convergence to a point are derived. At present
all theoretical PSO research is done under the stagnation assumption, in some form or
another. The analysis done under the stagnation assumption is one where the personal
best and neighborhood best are assumed to be non-changing. While analysis under the
stagnation assumption is very informative, it could never provide a complete description
of a PSO's behavior. Furthermore, the assumption implicitly removes the notion of
a social network structure from the analysis. The model used in this thesis greatly
weakens the stagnation assumption, by instead assuming that each particle's personal
best and neighborhood best can occupy an arbitrarily large number of unique positions.
Empirical results are presented to support the theoretical fndings.Dissertation (MSc)--University of Pretoria, 2013.
gm2014
Computer Science
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Brown, A. S. "Critical phenomena in the Random Ising Model." Thesis, University of Edinburgh, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.370906.
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Williams, Paul Ivan. "The discharge-avalanche model of electrical trees." Thesis, King's College London (University of London), 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.307606.
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Cahill, Mark D. "An extension of the Skyrme model of baryons." Thesis, University of Kent, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329094.
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Manukyan, Gor. "Theoretical model for impedance spectroscopy in concentration polarization /." [Sede Boqer] : Ben-Gurion University of the Negev, Albert Katz International School for Desert Studies, 2006. http://aranne5.lib.ad.bgu.ac.il/others/ManukyanGor.pdf.
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Kelly, O. "Bullying in the workplace: towards a theoretical model." Thesis, University of Birmingham, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.492320.
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This thesis is submitted in partial fulfilment of the requirements for the degree of Doctor of Clinical Psychology (C1in. Psy. D) at The University of Birmingham. It represents both research and clinical components of the course. Volume I comprises the research component of the thesis. It consists of three research papers which have been prepared for submission to specified academic journals (see Appendix I Instructions to Authors). Contrary to journal submission requirements, in order to aid the reader, tables and figures have been integrated into the text. The first paper is a review of the literature on the definition and causes of workplace bullying. This paper has been prepared for submission to Clinical Psychology Review. The second paper is a qualitative research study of the experiences of eleven people who were bullied at work. The aim of this paper is to develop a theoretical model of the experience. This paper has been prepared for submission to Theory and Psychology. The third paper is a brief qualitative paper investigating the types of bullying behaviours experienced in the workplace. This paper has been prepared for submission to the Journal of Community and Applied Social Psychology. The final section of Volume I comprises the appendices for all three papers. Volume II comprises the clinical component of the thesis. It consist of five clinical practice reports which reflect the clinical work carried out during the course. The reports include a short case study of a pre-school boy with Oppositional Defiant Disorder; a case study of a woman with Obsessive-Complulsiv Deisorder; a single-case research design study of an older adult with a Sleeping Disorder; a consumer evaluation study of the Children and Young Persons Initiative (CYPI) -a community service for children with learning disabilities and challenging behaviours; and a psychodynamic case presentation of a 30 year old woman presenting with Agoraphobia.
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Rowe, Diane Mary. "Work-family role conflict, a new theoretical model." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/mq22666.pdf.
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Chang, Yun Kyung Mark Barbara A. "Testing a theoretical model for severe medication errors." Chapel Hill, N.C. : University of North Carolina at Chapel Hill, 2007. http://dc.lib.unc.edu/u?/etd,1361.
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Thesis (Ph. D.)--University of North Carolina at Chapel Hill, 2007.Title from electronic title page (viewed Apr. 25, 2008). "... in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the School of Nursing." Discipline: Nursing; Department/School: Nursing.
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Burns, Barrett A. (Barrett Adams) 1972. "A theoretical plasma physics model of the plasmatron." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/26912.
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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 2004.Includes bibliographical references (leaf 69).
An analysis was conducted to determine the behavior of a high pressure electric arc discharge inside the Plasmatron Fuel Reformer. The Plasmatron Fuel Reformer uses an electric arc to partially combust fuel in an internal combustion engine to increase efficiency and reduce emissions. Solutions of the conservation equations for the arc yield temperature, pressure and velocity profiles for arcs with 0.2-0.8 A currents. Acquired knowledge was used to predict arc radius and power delivered by the arc as a function of current.
by Barrett A. Burns.
S.M.
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Trinh, Chau Thi My. "Earnings forecasts : model development, evaluation and theoretical analysis." Thesis, University of Bristol, 2015. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.686827.
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Earnings forecasts are an important input for equity valuation and asset allocation decision. Nevertheless, there are many contradictory findings about the most accurate model as well as the best proxy for the market expectation of future earnings in the literature. Hence, with the aim of providing solutions to these problems, this thesis comprises four main studies of different issues related to forecasting earnings.
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Sartor, Raymond Francis. "A Theoretical Model of Supersonic Steam Nozzle Behavior /." The Ohio State University, 1996. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487932351058977.
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Han, Yunqing. "THEORETICAL STUDY OF THERMAL ANALYSIS KINETICS." UKnowledge, 2014. http://uknowledge.uky.edu/me_etds/35.
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In the past decades, a great variety of model fitting and model free (isoconversional) methods have been developed for extracting kinetic parameters for solid state reactions from thermally stimulated experimental data (TGA, DSC, DTA etc.). However, these methods have met with significant controversies about their methodologies. Firstly, model-fitting methods have been strongly criticized because almost any reaction mechanism can be used to fit the experimental data satisfactorily with drastic variations of the kinetic parameters, and no good criterion exists to tell which mechanism is the best choice. Secondly, previous model free methods originated from the isoconversional principle, which is often called the basic assumption; previous studies comparing the accuracy of model free methods have not paid attention to the influence of the principle on model free methods and, therefore, their conclusions are problematic.
This work gives, firstly, a critical study of previous methods for evaluating kinetic parameters of solid state reactions and a critical analysis of the isoconversional principle of model free methods. Then an analysis is given of the invariant kinetic parameters method and recommends an incremental version of it. Based on the incremental method and model free method, a comprehensive method is proposed that predicts the degree of the dependences of activation energy on heating programs, and obtains reliable kinetic parameters. In addition, this work also compares the accuracy of previous methods and gives recommendations to apply them to kinetic studies.
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Nakhmanson, Serge M. "Theoretical Studies of Amorphous and Paracrystalline Silicon." Ohio University / OhioLINK, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou984426180.
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Masud, Bilal. "A model for systems of two quarks and two antiquarks." Thesis, University of Oxford, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.316994.
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Shi, Jianjun. "Experimental and theoretical studies of atmospheric glow discharges." Thesis, Loughborough University, 2005. https://dspace.lboro.ac.uk/2134/7982.
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This thesis presents the experimental and theoretical studies of nonthermal and stable atmospheric-pressure glow discharges. With the excitation frequency in the kilohertz range, a uniform and stable glow discharge has been successfully produced in atmospheric helium without the usually indispensable dielectric barrier. For this barrier-free cold atmospheric discharge, there are two discharge events occurring, respectively, in the voltage-rising and the voltage-falling phases, and in general they compete with each other. This distinct feature is illustrated through a detailed fluid simulation. For direct current atmospheric glow discharges, their cathode fall region is shown to depend critically on the discharge current density. For atmospheric glow discharges excited at 13.56 MHz on the other hand, we present observations that after gas breakdown, the discharge evolves from the normal glow mode to the abnormal glow mode and then through the recovery mode back to the normal glow mode. The operation modes, namely the a mode and the y mode, in radio-frequency atmospheric glow discharges are investigated with a one-dimensional, self-consistent continuum model. This model is evaluated by comparing our numerical results with experimental data and other simulation results in literature. It is shown that gas ionization is volumetric in the a mode and localized in the boundary region between the sheath and the bulk plasma in the y mode. The stable operation regime in the a mode is found to have a positive differential conductivity, and can be expanded to higher discharge current density without compensating plasma reactivity by increasing the excitation frequency. Furthermore this plasma stability-reactivity balance is also studied for radio-frequency atmospheric glow microdischarges.
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Rowan, David Glenn. "Theoretical studies of disordered short-range spin models." Thesis, University of Oxford, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.299226.
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Yacoob, Sahal. "Canonical strangeness conservation in the hadron gas model of relativistic heavy ion collisions." Master's thesis, University of Cape Town, 2001. http://hdl.handle.net/11427/6508.
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Includes bibliographical references (leaves: 73-77)The CERN WA97 results display a strong strangeness enhancement at mid-rapidity which is dependent on the strangeness of the particle concernec, and saturates at values of participating nucleons greater than 120. These results are phenomenologically described by the mixed canonical ensemble, with canonical (exact) strangeness conservation involving all strange resonances, and grand canonical conservation of charge and baryon number. It is shown that the data are well described by an equilibrium hadron gas. Other explanations of these data are reviewed.
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Werthenbach, Anja. "Theoretical and phenomenological aspects of vector boson production." Thesis, Durham University, 2000. http://etheses.dur.ac.uk/4200/.
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The production of three gauge bosons in high-energy collisions - in particular in view of a next-linear collider with center of mass energies in the TeV range - offers an unique opportunity to probe the Standard Model (SM) of today's particle physics. In this thesis we pay particular attention to the electroweak sector of the theory. We investigate the gauge structure {i. e. possible deviations from the SM predictions of gauge boson self-interactions manifest e. g. in anomalous quartic gauge boson couplings and Radiation zeros) as well as electroweak radiative corrections in order to improve theoretical predictions for SM processes. Quartic gauge boson couplings can be regarded as a direct window on the sector of electroweak symmetry breaking. We have studied the impact of three such anomalous couplings on the processes e+e(^-) → WWγ, ZZγ and Zγγ at LEP2 and a future linear collider. In certain high-energy scattering processes involving charged particles and the emission of one or more photons, the scattering amplitude vanishes for particular configurations of the final state particles. The fact that gauge symmetry is a vital ingredient for the cancellation to occur means that radiation zeros can be used to probe physics beyond the standard model. For example anomalous electroweak gauge boson couplings destroy the delicate cancellation necessary for the zero to occur. We have studied the process qq → WWγ. To match the expected experimental precision at future linear colliders, improved theoretical predictions beyond next-to-leading order are required. By choosing an appropriate gauge, we have developed a formalism to calculate such corrections for arbitrary electroweak processes. As an example we consider here the processes e(^+)e → f f and e(^+)e(^-) → W(^+)(_T)W(^-)(_T), W(^+)(_L)W(^-)(_L) and study the perturbative structure of the electroweak Sudakov logarithms by means of an explicit two-loop calculation. In this way we investigate how the Standard Model, with its mass gap between the photon and Z boson in the neutral sector, compares to unbroken theories like QED and QCD. We observe that the two-loop corrections are consistent with an exponentiation of the one-loop corrections. In this sense the Standard Model behaves like an unbroken theory at high energies.
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Krentz, Caroline D. "A theoretical-integrative model of core curriculum policy-making." Thesis, University of Ottawa (Canada), 1989. http://hdl.handle.net/10393/20769.
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Ham, Roger, University of Western Sydney, and School of Economics and Finance. "The urban residential economic model : theoretical and empirical developments." THESIS_XXX_EFI_HAM_R.xml, 1999. http://handle.uws.edu.au:8081/1959.7/447.
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The aim of thesis is to analyse the economic model of urban residential location through the application of duality methods. Whilst some dual methods have been used in urban economic modelling in the past this paper proposes alternative dual approaches which appear to be novel, but are complimentary to existing approaches to the urban model. As part of the application of dual techniques the paper proposes a method of application which is general enough to be applied to all Von Thunen type models and tests this proposition on the fundamental agrarian model of Von Thunen. As part of the dual analysis of the urban residential model the conditions for the traditional lot size hypothesis are examined in the light of conditional demand functions stemming from the dual analysis. The work also empirically tests the traditional residential lot size hypothesis for various Australian cities. The empirical method adopted involves estimation of density gradients utilising competing non-nested flexible form models and discrimination between these alternative models utilising semi-parametric non-nested tests based on an artificial regression model. Two of the three competing models have not been used in this context before, one of them being completely novel. Moreover, the artificial regression model has not been previously used in this context, requiring some modification to deal with the problem of competing models with dependent variable transformation.Doctor of Philosophy (PhD)
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Staninska, Ana. "A theoretical model for self-assembly of flexible tiles." [Tampa, Fla.] : University of South Florida, 2007. http://purl.fcla.edu/usf/dc/et/SFE0002041.
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Zalar, Frank M. "Model and theoretical simulation of solid oxide fuel cells." Columbus, Ohio : Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1189691948.
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Ham, R. "The urban residential economic model : theoretical and empirical developments /." View thesis, 1999. http://library.uws.edu.au/adt-NUWS/public/adt-NUWS20030807.092212/index.html.
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Palframan, J. T. "Spirituality at work : the development of a theoretical model." Thesis, Liverpool John Moores University, 2014. http://researchonline.ljmu.ac.uk/4325/.
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Spirituality at work has received much interest in recent years, and a stream of research notes its benefits beyond a trend. Despite the topic’s growing recognition, the research community raised the need for the integration of spirituality at work with traditional areas of investigation (Giacalone & Jurkiewicz, 2003). A potentially fruitful first step towards this involves use of person-organisation (PO) fit theory (Ashforth & Pratt, 2003; Sheep, 2004, 2006; Singhal & Chatterjee, 2006; Singhal, 2007). The purpose of this study is to build upon initial attempts towards this integration and to promote further acknowledgement of the potential benefits of incorporating spirituality at work into wider organisational psychology frameworks. This was achieved by integrating both PO fit and transpersonal psychology, and subsequently developing a theoretical model that investigates three questions: a) what antecedents lead individuals and organisations to seek spirituality at work?, b) what are the perceived spiritual preferences (needs) of individuals and how are those preferences fulfilled through the context of the workplace (supplies)?, and c) what are the consequences of meeting spiritual preferences (needs), as perceived by individuals? Using constructivist grounded theory, analysis of interview data from thirty-four participants located in organisations (one spiritual and three non-spiritual) across The Netherlands, Ireland, the United Kingdom and Portugal led to a theory in which I propose a core category of reconciling self as a critical factor of spirituality at work. Reconciling self captures the process whereby the self consistently attempts to maintain a congruent relationship with the ego and the environment, and this construct emerged as the primary concern for participants. Reconciling self was influenced largely by meaning and purpose and the need to connect to something larger than oneself, and through the organisation making a difference. The congruence or perceived fit within the workplace was captured through the action strategy conscious reconciling experiences; in the case where the immediacy of such expression was compromised, reconciling self was noted through the action strategy active adjustment. The action strategies were influenced through a set of intervening conditions that included a set of spirituality at work needs and supplies, through a context that emphasised attributes such as spiritual values, a culture that focused on openness and support, and relational leadership. The consequences of spirituality at work included benefits such as individual job satisfaction, positivity and self-realisation, and organisational outcomes as being a force for good and fostering employee commitment. The contribution of this study includes a new theoretical model concerning why, when, and how spirituality at work influences individual and organisational processes and outcomes. Such understanding contributes to better understanding of spirituality at work, and identifies ways in which PO fit occurs within a broader psychological context than that proposed in mainstream organisational psychology (i.e. through reconciling self influenced by meaning and purpose, the need to connect to something larger than oneself, and a set of spirituality at work needs). These findings reduce the PO fit gap. Implications of the study include the findings that spirituality at work creates positive outcomes, and insistence on the role of connecting to something larger than oneself implies individuals are always in the process of moving toward reconciling self. Organisations should consider their ability to harness latent human potential and transcendence by extending self-boundaries and developing the self. Limitations and future research directions are discussed.
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Tough, Andrew John. "A theoretical model of streptomycete growth in submerged culture." Thesis, University of Aberdeen, 1989. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU553421.
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A theoretical model based on finite elements has been formulated for the growth and development of submerged mycelial pellet populations. Models based on partial differential equations proved to be mathematically unstable. The model is tested experimentally by studying the growth of the filamentous bacterium Streptomyces coelicolor A3(2) in batch and continuous culture. The effects of shear, growth rate and inoculum concentration on population development are considered. All pellets are assumed to grow according to cube root kinetics. Variations in the amount of biomass occurring throughout the width of the peripheral growth zone are accounted for. An inability to accurately simulate variations in pellet strength meant that whilst growth in low shear environments could be simulated well, growth at high shear could only be simulated qualitatively. Biomass yield was directly related to agitation rate, a phenomenon, suggested by the model, to be caused by the influence of agitation on 'pro-pellet' formation. Pellet density was inversely related to pellet radius. Although gross pellet morphology was dependent on medium composition, it was the relative effects of agitation rate and growth rate which determined the form of the pellet size distribution. Antifoam, and pH had no effect on the morphology of pellets grown in shake flasks, though the pellet size distribution was affected. Increasing concentrations of antifoam emulsion above 1&'37 v/v caused a reduction in pellet number, suggesting inhibition of germination, whereas below 1&'37 v/v an increase led to an increase in pellet number suggesting an effect on pro-pellet formation. The effect of increasing pH over a range from 5 to 9 was to reduce pellet number. Modal pellet radius was inversely related to agitation rate and inoculum concentration. Agitation rate influenced the pellet size distribution in two ways (i) by affecting spore agglomeration and hence pro-pellet formation at low shear rates, and (ii) by causing mechanical damage to pellets at high shear rates.
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Beyerlein, Susan T. "A theoretical model of technical professionals in work teams." Thesis, University of North Texas, 1994. https://digital.library.unt.edu/ark:/67531/metadc277746/.
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A two-stage study was conducted which examined role strain and its correlates among technical professional employees in team settings in 14 companies in the United States and Canada. A questionnaire was constructed based on the results of interviews with engineers and managers, and the analysis of simple plot data.
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Deknatel, William Brockway. "A theoretical model of component activities in magnesian calcites." Diss., The University of Arizona, 1991. http://hdl.handle.net/10150/185369.
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Calcium carbonate, calcite, and magnesium carbonate, magnesite, form a series of solid solutions with compositions ranging 0 to 50% magnesite which is dolomite the end member of the series. The calcite magnesite solid solutions are called magnesian calcites (Mg-calcites). Mg-calcites exist in nature, in soils, in marine skeletal materials, in some marine cements, etc., and their existence has been associated with the supersaturation of calcite in sea water and the soil solution of some calcareous soils. They are clearly more soluble than calcite, but their chemical properties has not been defined. This paper examines the basic chemistry of the Mg-calcites and develops a theoretical model derived from the regular solution model and based on classical equilibrium thermodynamics. This model can be used to predict solubility and explain the behavior of the Mg-calcites.
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SPENCER, REED FRANK. "RAISING INTELLIGENCE IN THE PUBLIC SCHOOLS: A THEORETICAL MODEL." Diss., The University of Arizona, 1985. http://hdl.handle.net/10150/187964.
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The problem addressed in this theoretical study was that although current knowledge and research indicate clearly that intelligence can be raised in the regular classroom, there did not exist a model to guide teachers in doing so. The purpose of this study, then, was to construct a model which would guide teachers in adapting their instruction so that "teaching was thinking," or teaching to raise intelligence be deliberately addressed by the way existing subjects are taught, rather than (or in addition to) as a separate subject. In other words, the purpose of the study was to propose a model which would help teachers deliberately and systematically improve students' generic skills of intelligence in the course teaching normal curricular subjects--a way of teaching rather than a separate subject. The first issue addressed is the historical context surrounding the debate over the construct of intelligence as alterable--that intelligence is not an immutable "amount," but the orchestration and use of malleable, teachable processes. Second, philosophic, psychological and educational foundations were laid and examined, and the model was proposed and discussed. Particular emphasis was given discussion of model theory, including the need for and structural parameters of academically honest models. Third is the review and discussion of research and writing relating to the instructional attempts to raise intelligence. This review begins with seminal theoretical works, and progressing through to those with increasingly specific applications to actual instruction in the classroom. Fourth, the model was used to generate specific, substantive examples--lessons plans--of instructional strategies within various subjects. Although the content used is from elementary school curricula, the model is equally applicable to high school, college, or any other instructional area. Fifth and finally, the problems and promises inherent in the attempt to implement such a curricular effort were examined.
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Hillhouse, Joel J., and Rob Turrisi. "Motivations for Indoor Tanning: Theoretical Models." Digital Commons @ East Tennessee State University, 2016. https://dc.etsu.edu/etsu-works/63.
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This chapter reviews the literature applying health behavior theories to indoor tanning. Few studies have tried to fit full versions of health behavior models to indoor tanning. Theoretical models from the family of theories referred to as the reasoned action approach (e.g., theory of planned behavior, behavioral alternative model, prototype willingness model, etc.) have been most commonly used to study indoor tanning. Results indicate that these models fit indoor tanning data moderately to extremely well. Two lesser known models, problem behavior theory and the terror management health model, have also demonstrated a reasonable fit. Two other common models, the health belief model and social cognitive theory, have never been fully tested with indoor tanning. However, key constructs from these models (e.g., perceived susceptibility and threat, modeling) have been used to understand indoor tanning. Empirical research conducted represents a solid start toward developing strong, comprehensive models of indoor tanning that can guide intervention efforts. This initial work needs to be expanded by conducting longitudinal studies and by including a broader age range in studies because the majority of existing work has focused on young adults. Incorporating findings related to tanning dependency, peer group affiliation, media influences and other constructs into these foundational models will also improve our understanding and ability to develop efficacious interventions to reduce engagement in this health risk behavior.
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Frade, Carlos Augusto Zerpa. "Performance of return models : a portfolio theoretical approach." Master's thesis, Instituto Superior de Economia e Gestão, 2017. http://hdl.handle.net/10400.5/14699.
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Mestrado em FinançasO objetivo desta investigação é avaliar o impacto das assunções dos modelos geradores de retornos nas fronteira eficiente e seus portafolios. Isto foi conseguido mediante o trabalho in-sample (assim eliminando o risco de estimação, focando a investigação no risco de modelo) em ambos mercados de ativos financeiros, o Europeo e Americano, nos 7 anos anteriores, considerando ambos, o caso em que shortselling esta permitido como também o caso em que esta proibido. O processo inclui o calculo da fronteira eficiente seguindo as assunções dos modelos geradores de retornos. Em particular o Constant Correlation Model (CCM), o Single-Index Model (SIM) e o modelo de tres factores de Fama e French (1993) Multi-Factor Model (MFM). Para os dois mercados de investimentos, comparamos a fronteira eficiente gerada aplicando MVT nos dados in-sample com a fronteira eficiente dos modelos de retorno seleccionados. Mostramos que o risco do model è importante na aplicação do MVT. Sendo os erros encontrados em todos os modelos consideravel. Também, considerando o risco de modelo para o caso de shortselling proibido, o CCM mostra melhor desempenho que os modelos mais sofisticados. Por outra parte, em condiçoes de shortselling permitido, o SIM mostra melhor desempenho.
The objective of this research is evaluating the impact of the return generating models assumptions in the efficient frontier and its portfolios. This is accomplished by working with in-sample data (eliminating the estimation risk and focus on the model risk) looking at both the European and American stock markets for the past 7 years, and considering both, the case when shortselling is allowed and the case when it is forbidden. The process includes the calculation of efficient frontier under the assumptions of return generating models. In particular, we look at the Constant Correlation Model (CCM), the Single-Index Model (SIM) and the three factors Fama and French (1993) Multi-Factor Model (MFM). For both markets we compared the true efficient frontier generated from the in-sample MVT with the corresponding efficient frontiers from the return generating models. We show model risk is an important issue when applying MVT. The errors in all model are considerable. In addition, considering model risk for cases when the short-sell is not allowed, the CCM is more accurate than more sophisticated models. On the other hand, under conditions of short-sell allowed, the SIM seams to be more accurate.
info:eu-repo/semantics/publishedVersion
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Torracchi, Federico. "Essays in empirical and theoretical labor market models." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:4703d768-3796-42ce-ae6c-75c1f582db67.
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This DPhil thesis is a collection of three theoretical and empirical papers studying labor markets in several advanced economies. Two chapters examine the relationship between the banking sector and the labor market in the US and the UK, while one evaluates a policy that has been proposed to help labor markets in the Euro Area adjust to economic shocks. In the first chapter, I develop a New Keynesian DSGE model that integrates a banking sector subject to moral hazard with a standard random search model of the labor market. I estimate the model using US data and study the role of the banking sector in determining labor market fluctuations. In the second chapter, I estimate a structural VAR model of the UK and US economies and identify bank lending shocks using a mix of sign and short-run exclusion restrictions. Consistent with the predictions of the DSGE model, an expansionary loan supply shock decreases job-destruction and increases job-creation, reducing the unemployment rate persistently. Bank lending shocks are also important drivers of labor market fluctuations, particularly during the Great Recession. Lastly, in the third chapter, I calibrate to the Euro Area a currency union DSGE model to evaluate the aggregate properties of European Unemployment Insurance (EUI). I find that EUI cannot contemporaneously stabilize the monetary union and achieve convergence in regional unemployment and inflation rates.
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Dong, Yingying. "Microeconometric Models with Endogeneity -- Theoretical and Empirical Studies." Thesis, Boston College, 2009. http://hdl.handle.net/2345/753.
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Thesis advisor: Arthur LewbelThis dissertation consists of three independent essays in applied microeconomics and econometrics. Essay 1 investigates the issue why individuals with health insurance use more health care. One obvious reason is that health care is cheaper for the insured. But additionally, having insurance can encourage unhealthy behavior via moral hazard. The effect of health insurance on medical utilization has been extensively studied; however, previous work has mostly ignored the effect of insurance on behavior and how that in turn affects medical utilization. This essay examines these distinct effects. The increased medical utilization due to reduced prices may help the insured maintain good health, while that due to increased unhealthy behavior does not, so distinguishing these two effects has important policy implications. A two-period dynamic forward-looking model is constructed to derive the structural causal relationships among the decision to buy insurance, health behaviors (drinking, smoking, and exercise), and medical utilization. The model shows how exogenous changes in insurance prices and past behaviors can identify the direct and indirect effects of insurance on medical utilization. An empirical analysis also distinguishes between intensive and extensive margins (e.g., changes in the number of drinkers vs. the amount of alcohol consumed) of the insurance effect, which turns out to be empirically important. Health insurance is found to encourage less healthy behavior, particularly heavy drinking, but this does not yield a short term perceptible increase in doctor or hospital visits. The effects of health insurance are primarily found at the intensive margin, e.g., health insurance may not cause a non-drinker to take up drinking, while it encourages a heavy drinker to drink even more. These results suggest that to counteract behavioral moral hazard, health insurance should be coupled with incentives that target individuals who currently engage in unhealthy behaviors, such as heavy drinkers. Essay 2 examines the effect of repeating kindergarten on the retained children's academic performance. Although most existing research concludes that grade retention generates no benefits for retainees' later academic performance, holding low achieving children back has been a popular practice for decades. Drawing on a recently collected nationally representative data set in the US, this paper estimates the causal effect of kindergarten retention on the retained children's later academic performance. Since children are observed being held back only when they enroll in schools that permit retention, this paper jointly models 1) the decision of entering a school allowing for kindergarten retention, 2) the decision of undergoing a retention treatment in kindergarten, and 3) children's academic performance in higher grades. The retention treatment is modeled as a binary choice with sample selection. The outcome equations are linear regressions including the kindergarten retention dummy as an endogenous regressor with a correlated random coefficient. A control function estimator is developed for estimating the resulting double-hurdle treatment model, which allows for unobserved heterogeneity in the retention effect. As a comparison, a nonparametric bias-corrected nearest neighbor matching estimator is also implemented. Holding children back in kindergarten is found to have positive but diminishing effects on their academic performance up to the third grade. Essay 3 proves the semiparametric identification of a binary choice model having an endogenous regressor without relying on outside instruments. A simple estimator and a test for endogeneity are provided based on this identification. These results are applied to analyze working age male's migration within the US, where labor income is potentially endogenous. Identification relies on the fact that the migration probability among workers is close to linear in age while labor income is nonlinear in age(when both are nonparametrically estimated). Using data from the PSID, this study finds that labor income is endogenous and that ignoring this endogeneity leads to downward bias in the estimated effect of labor income on the migration probability
Thesis (PhD) — Boston College, 2009
Submitted to: Boston College. Graduate School of Arts and Sciences
Discipline: Economics
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Qiu, Yang. "Dissolution mechanisms: theoretical and experimental investigations." Diss., University of Iowa, 2015. https://ir.uiowa.edu/etd/1892.
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The dissolution behavior of a drug substance is an important part of its bioavailability. Three solid dissolution mechanisms are recognized: transport control, interface control and mixed-kinetic control. The mixed-kinetic control mechanism is not well studied as the majority of dissolution phenomena in pharmaceutical research are assumed to be transport-controlled. A phenomenological model for mixed-kinetic control was developed in which the interfacial step comprises molecular detachment and re-deposition and is described by chemical kinetic theory. This model encompasses interface control and transport control as limiting cases.
Experimental studies on three organic compounds showed that they dissolved by transport control at 37°C, but exhibited certain degrees of interface control at lower temperatures (10°C and 3°C), which, according to the model, indicates that reducing the dissolution temperature slowed down re-deposition more than transport. Using mathematical approaches derived from the model, up to 27% interface control was calculated from the experimental results.
The second experimental investigation showed significant degrees of interface control in benzoic acid dissolution in sodium dodecyl sulfate (NaDS) solutions at 25°C. The dissolution behavior was well described by the mixed-kinetic control model and up to 73% interface control was calculated. An extension of the model was proposed to describe a potential micelle-interface interaction mechanism indicated by the model-fitted parameters.
The third investigation showed that FD&C Blue #1, a water-soluble dye, inhibited sulfathiazole dissolution in acidic media but not in water. The inhibition was attributed to the blocking of dissolution sites by dye adsorption. A potential pH-dependent adsorption mechanism was proposed in which protonation at sulfathiazole solid surface gives rise to preferential dye adsorption on detachment rates and thus reduced dissolution rates.
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Ghosh, Raja. "Spectroscopy of Polarons in Organic Semiconductors: A New Theoretical Model." Diss., Temple University Libraries, 2019. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/574625.
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ChemistryPh.D.
The spectral line-shape of the mid-IR absorption spectrum provides valuable information about the "hole" polaron coherence length in doped and undoped conjugated polymer films. In poly(3-hexylthiophene) (P3HT) films the spectrum generally consists of a narrow, low-energy peak A (700-1000 $cm^{-1}$) followed by a much broader, higher-energy peak B (2500-5000 $cm^{-1}$). Using a theory based on the Holstein Hamiltonian for mobile holes in P3HT, the IR line-shape is successfully reproduced for several recently measured spectra recorded in doped and undoped films, confirming the association of an enhanced peak ratio (A/B) with extended polaron coherence. Emphasis is placed on the origin of components polarized along the intra- and inter-chain directions and their dependence on the spatial distribution of disorder as well as the position of the dopant relative to the $\pi$-stack. The model is further adapted to treat donor-acceptor copolymers where the local HOMO energy varies periodically from donor unit to acceptor unit. The calculated line shape for a diketopyrrolopyrrole-based copolymer agrees well with the recently measured spectrum.
Temple University--Theses
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Niasar, Mohammadreza Zakeri. "Extensions of the Standard Model with Dark Matter in Some Explicit Examples." Thesis, University of California, Riverside, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10606425.
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The compelling astrophysical evidence for dark matter on one hand and the experimental evidence for neutrino masses on the other, demands modifications beyond the Standard Model. Therefore, building new models by extending the symmetries and particle content of the Standard Model is being pursued to remedy these problems. In this thesis, various models along with their predictions are presented. First, a gauge SU(2)N extension of the Standard Model, under which all of the Standard Model particles are singlet is introduced. The inverse seesaw mechanism is implemented for neutrino mass, with the new gauge boson as a dark matter candidate. The second paper is a gauge B-L extension of the Standard Model which breaks down to Z3, and it includes a long-lived dark matter candidate. The next model assumes that leptons do not couple directly to Higgs, and one loop mass generation is considered with important consequences, including Higgs decay, muon anomalous magnetic moment, etc. We then look at a U(1) gauge extension of the supersymmetric Standard Model, which has no μ term, and the Higgs boson's mass supersymmetric constraint is relaxed. The next model is a gauge B-L extension of the Standard Model with radiative seesaw neutrino mass and multipartite dark matter. We then consider another gauge U(1) extension under which quarks and leptons of each family may transform differently, while flavor-changing interactions are suitably suppressed. The next paper has an unbroken gauge SU(2) symmetry, which becomes confining at keV scale. We discuss the cosmological constraints and the implications for future e +e– colliders. Finally, an alternative left-right model is proposed with an automatic residual Z 2 × Z3 symmetry, such that dark matter has two components, i.e., one Dirac fermion and one complex scalar.
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Pachos, Jiannis. "The Schrödinger representation for ϕ⁴ theory and the O(N) σ-model." Thesis, Durham University, 1996. http://etheses.dur.ac.uk/5384/.
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In this work we apply the field theoretical Schrodinger representation to the massive ϕ⁴ theory and the O(N) σ model in 1 + 1 dimensions. The Schrodinger equation for the ϕ⁴ theory is reviewed and then solved classically and semiclassically, to obtain the vacuum functional as an expansion of local functionals. These results are compared with equivalent ones derived from the path integral formulation to prove their agreement with the conventional field theoretical methods. For the O(N) a model we construct the functional Laplacian, which is the principal ingredient of the corresponding Schrodinger equation. This result is used to construct the generalised Virasoro operators for this model and study their algebra.
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Willers, Bernard. "Pion electromagnetic form factor in the Kroll-Lee-Zumino model at zero and finite temperature." Master's thesis, University of Cape Town, 2008. http://hdl.handle.net/11427/6510.
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Includes abstract.Includes bibliographical references (p. 47-48).
The renormalizable Abelian quantum field theory model of Kroll, Lee and Zumino is used to calculate next-to-leading order corrections to the pion electromagnetic form factor in vector meson dominance. At zero temperature the predictions for both the form factor and electromagnetic radius are found to improve greatly over the tree level result, and are in good agreement with the experimental data. A calculation of the vertex and self energy functions in the Matsubara formalism at finite temperature do not agree with the results of the Gale & Kapusta calculations. The resulting prediction for the radius is found to increase with temperature, consistent vith ideas about haclronic deconfinernent.
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Roos, Magnus. "Speech Comprehension : Theoretical approaches and neural correlates." Thesis, Högskolan i Skövde, Institutionen för biovetenskap, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-11240.
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This review has examined the spatial and temporal neural activation of speech comprehension. Six theories on speech comprehension were selected and reviewed. The most fundamental structures for speech comprehension are the superior temporal gyrus, the fusiform gyrus, the temporal pole, the temporoparietal junction, and the inferior frontal gyrus. Considering temporal aspects of processes, the N400 ERP effect indicates semantic violations, and the P600 indicates re-evaluation of a word due to ambiguity or syntax error. The dual-route processing model provides the most accurate account of neural correlates and streams of activation necessary for speech comprehension, while also being compatible with both the reviewed studies and the reviewed theories. The integrated theory of language production and comprehension provides a contemporary theory of speech production and comprehension with roots in computational neuroscience, which in conjunction with the dual-route processing model could drive the fields of language and neuroscience even further forward.
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Zulkepli, Jafri. "A theoretical framework for hybrid simulation in modelling complex patient pathways." Thesis, Brunel University, 2012. http://bura.brunel.ac.uk/handle/2438/6448.
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Providing care services across several departments and care givers creates the complexity of the patient pathways, as it deals with different departments, policies, professionals, regulations and many more. One example of complex patient pathways (CPP) is one that exists in integrated care, which most literature relates to health and social care integration. The world population and demand for care services have increased. Therefore, necessary actions need to be taken in order to improve the services given to patients in maintaining their quality of life. As the complexity arises due to different needs of stakeholders, it creates many problems especially when it involves complex patient pathways (CPP). To reduce the problems, many researchers tried using several decision tools such as Discrete Event Simulation (DES), System Dynamic (SD), Markov Model and Tree Diagram. This also includes Direct Experimentation, one of techniques in Lean Thinking/Techniques, in their efforts to help simplify the system complexity and provide decision support tools. However, the CPP models were developed using a single tools which makes the models have some limitations and not capable in covering the entire needs and features of the CPP system. For example, lack of individual analysis, feedback loop as well as lack of experimentation prior to the real implementation. As a result, ineffective and inefficient decision making was made. The researcher also argues that by combining the DES and SD techniques, named the hybrid simulation, the CPP model would be enhanced and in turn will help to provide decision support tools and consequently, will reduce the problems in CPP to the minimum level. As there is no standard framework, a framework of a hybrid simulation for modelling the CPP system is proposed in this research. The researcher is much concerned with the framework development rather than the CPP model itself, as there is no standard model that can represent any type of CPP since it is different in term of its regulations, policies, governance and many more. The framework is developed based on several literatures, selected among developed framework/models that have used combinations of DES and SD techniques simultaneously, applied in a large system or in healthcare sectors. This is due to the condition of the CPP system which is a large healthcare system. The proposed framework is divided into three phases, which are Conceptual, Modelling and Models Communication Phase, and each phase is decomposed into several steps. To validate the suitability of the proposed framework that provides guidance in developing CPP models using hybrid simulation, the inductive research methodology will be used with the help of case studies as a research strategy. Two approaches are used to test the suitability of the framework – practical and theoretical. The practical approach involves developing a CPP model (within health and social care settings) assisted by the SD and DES simulation software which was based on several case studies in health and social care systems that used single modelling techniques. The theoretical approach involves applying several case studies within different care settings without developing the model. Four case studies with different areas and care settings have been selected and applied towards the framework. Based on suitability tests, the framework will be modified accordingly. As this framework provides guidance on how to develop CPP models using hybrid simulation, it is argued that it will be a benchmark to researchers and academicians, as well as decision and policy makers to develop a CPP model using hybrid simulation.
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Hallin, Nathalie. "Cognitive Dissonance : Neural Correlates and New Theoretical Approaches." Thesis, Högskolan i Skövde, Institutionen för kommunikation och information, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-7173.
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Cognitive dissonance has traditionally been defined as the negative affective state which accompanies inconsistent cognitions and motivates one to make the cognitions consistent. This thesis critically evaluates two theories about cognitive dissonance. The action-based model of dissonance argues that inconsistent cognitions have the potential to interfere with effective and unconflicted action. The new look model of dissonance, contradicting the traditional definition of dissonance, argues that it is aversive consequences rather than inconsistent cognitions that cause dissonance. Recent studies investigating the neural correlates of dissonance show that parts of anterior cingulate cortex and prefrontal cortex seem to be involved in the dissonance process. One of the major predictions of the new look model of dissonance has been undermined by recent evidence. In contrast, the action-based model of dissonance is supported by recent studies.
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Mück, Alexander. "The standard model in 5D theoretical consistency and experimental constraints /." [S.l. : s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=974408107.
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Lupisella, Mark Lewis. "A theoretical microbial contamination model for a human Mars mission." College Park, Md. : University of Maryland, 2006. http://hdl.handle.net/1903/3366.
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Thesis (Ph. D.) -- University of Maryland, College Park, 2006.Thesis research directed by: Biology. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
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Lee, Jeff. "Regen, a theoretical model for the prediction of advanced regeneration." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ35511.pdf.
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Lee, Jeff. "Regen, a theoretical model for the prediction of advanced regeneration." Thesis, University of New Brunswick, 1997. http://hdl.handle.net/1882/633.
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