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Slind, Konrad. "Reasoning about terminating functional programs." [S.l. : s.n.], 1999. http://deposit.ddb.de/cgi-bin/dokserv?idn=962069752.
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Richardson, D. S. "Terminating parallel discrete event simulations." Thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-03172010-020620/.
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Martin, Jonathan Charles. "Judgement day : terminating logic programs." Thesis, University of Southampton, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.326732.
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Wabenhorst, Axel. "On fairness in terminating and reactive systems." Thesis, University of Oxford, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.337430.
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Taylor, James Benjamin Jr. "Investment-Consumption with a Randomly Terminating Income." BYU ScholarsArchive, 2013. https://scholarsarchive.byu.edu/etd/4069.
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We develop a stochastic control model for an investor's optimal investment and consumption over an uncertain planning horizon when the investor is endowed with a defaultable income stream. The distributions of the random time of default and the random terminal time are prescribed by deterministic hazard rates, and the investor makes investments in a standard financial market with a bond and a stock, modeled by geometric Brownian motion. In addition, the investor purchases insurance against both default and the terminal date, the default insurance serving as a proxy for the investor's disutility for default. We approximate the original continuous-time problem with a sequence of discrete-time Markov chain control problems by applying dynamic programming and the Markov chain approximation. We demonstrate how the problem can be solved numerically through a logarithmic transformation of the investor's wealth variable, even when the utilities are CRRA with large risk aversion parameter. The model and computational approach are applied to a retiree's optimal annuity decision in the presence of default risk, and we demonstrate that default risk can lead a retiree to annuitize significantly smaller proportions of savings, even when a portion of the defaulted annuity can be recovered, than is traditionally considered optimal by the retirement-finance community. Hence, we show that credit risk may play an important role in resolving the annuity puzzle.
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Westmacott, Robin. "Reasons for Terminating Psychotherapy: Client and Therapist Perspectives." Thèse, Université d'Ottawa / University of Ottawa, 2011. http://hdl.handle.net/10393/20228.
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Given the high prevalence of client unilateral termination from psychotherapeutic services, elucidating client reasons for ending therapy is an important activity for researchers. Three studies were designed to shed light on reasons for both premature and appropriate termination from the perspective of adult clients and therapists: 1) In Study 1, I examined data from the Canadian Community Health Survey, Cycle 1.2, to establish base rates of client reasons for psychotherapy termination in Canada, along with their demographic and clinical correlates, 2) In Study 2, I used training clinic data to examine client and therapist perspectives of reasons for termination, working alliance, and barriers to treatment participation in mutual versus unilateral terminators, and 3) In Study 3, I collected data from Canadian clinical psychologists to examine their perspectives of client reasons for early versus later termination, and their use of engagement strategies to reduce client-initiated unilateral termination. In Study 1, 43.1 percent of respondents reported terminating therapy for reasons other than feeling better or completing treatment. In general, individuals with low income and diagnosable mental disorders had significantly increased odds of premature termination. Study 2 revealed that when clients made unilateral decisions to end therapy, therapists were only partially aware of either the extent of clients’ perceptions of their success in therapy or with their dissatisfaction with therapy. Although working alliance and barriers to treatment participation were rated as lower in the context of unilateral termination by both clients and therapists than in the context of mutual decisions to terminate therapy, all clients, in general, rated the early alliance and barriers to treatment as higher than did their therapists. In Study 3 psychologists assigned differential importance to reasons for termination depending on whether termination was before versus after the third session. Theoretical orientation (CBT versus other) did not influence views of reasons for termination, but influenced use of some engagement strategies. Results are discussed in terms of research and clinical implications.
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Barros, Jose Bernado dos Santos Monteiro Vieira de. "Semantics of non-terminating systems through term rewriting." Thesis, University of Oxford, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.260738.
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Cowton, Thomas Ralph. "Hydrology of a land-terminating Greenlandic outlet glacier." Thesis, University of Edinburgh, 2013. http://hdl.handle.net/1842/8286.
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Hydrology is recognised as an important component of the glacial system in alpine environments. In particular, the subglacial drainage of surface meltwaters is known to exert a strong influence on the motion of glaciers and on their capacity to erode the underlying bedrock. This thesis examines the more poorly understood drainage system of the Greenland Ice Sheet, with specific focus on Leverett Glacier, a landterminating outlet glacier on the ice sheet’s western margin. Because of the vast size of the ice sheet, the influence of the drainage system could have wide ranging implications, most notably for sea level rise and continental scale landscape evolution. The thesis commences with an investigation into the morphology of the drainage system of the lower 14 km of Leverett Glacier. This is undertaken using a variety of field methods, including dye tracing and the monitoring of proglacial discharge, englacial water levels, surface melt rates and glacier motion. The data reveal that the drainage system of the glacier closely resembles that of alpine glaciers, undergoing an evolution from distributed to channelised drainage morphologies as the melt season progresses. Another aspect of the field data, the suspended sediment load evacuated from the subglacial system in the emerging proglacial river, is then examined to investigate the impact that this drainage system morphology has on the interaction between the glacier and the underlying bedrock or substrate. This demonstrates that the presence of large, efficient subglacial drainage channels allows for the removal of vast quantities of basal debris during much of the melt season, facilitating an erosion rate 1-2 orders of magnitude greater than previously proposed for ice sheet settings. The thesis then focuses on the relationship between discharge, water pressure and ice motion. Observations from Greenlandic and alpine glaciers demonstrate that glaciers generally decelerate through the melt season following a maximum velocity induced by the onset of melt in the spring. The data indicate that the evolution of the drainage system from a distributed to a channelised morphology occurs rapidly and so can only explain this trend in ice velocity during the early part of the melt season. Beyond this period, ice velocity patterns can instead be explained primarily by transient fluctuations in water pressure within the channelised drainage system. These transient pressure fluctuations result from the lag between changes to the rate of meltwater input to the glacier and the subsequent adjustment of channel cross section. This indicates that it is crucial to consider temporal variability in melt rate when seeking to link climate with the dynamics of ice sheets and glaciers. This process can be simulated, which is demonstrated by using the proglacial discharge record to model subglacial water pressure and ice velocity. In the following chapter, this model is built upon by considering how these variations in water pressure, originating in discrete subglacial channels, control sliding velocities across large areas of the glacier. Detailed examination of high-resolution ice velocity records from Leverett Glacier reveals that, in keeping with theory, horizontal ice velocity is dependent on both the volume of subglacial cavities and the rate-of-change of this volume. A simple model of subglacial water movement is then used to demonstrate how these changes in the cavity system could be driven by the pressure fluctuations predicted within the channelised drainage system. This enables a system scale model of glacier hydrology to be developed, which is presented in the final chapter, linking variations in surface melt rate to channel pressure, cavity volume and ultimately ice motion. In summary, this research has helped to illuminate the morphology and functioning of the drainage system of Leverett Glacier. This has improved our understanding of how hydrology influences both the motion of the Greenland Ice Sheet and its impact on the underlying topography, and enabled better prediction of how these processes are influenced by changes in climate.
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Musser, William G. "Terminating America's wars : the Gulf War and Kosovo." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2002. http://library.nps.navy.mil/uhtbin/hyperion-image/02Jun%5FMusser.pdf.
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Sanjeevan, Vasant. "The cost of terminating parallel discrete-event simulations." Thesis, This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-09292009-020138/.
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Fleischer, Theodore E. "As good as dead? : terminating treatment of demented patients." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ37252.pdf.
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Roche, Valles David. "Statistical framework for terminating evolutionary algorithms at their steady state." Doctoral thesis, Universitat Autònoma de Barcelona, 2015. http://hdl.handle.net/10803/305235.
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El objetivo de esta tesis es de determinar la calidad de las condiciones de parada existentes para terminar un Algoritmo Evolutivo cuando llegue a su un estado estacionario.
Un Algoritmo Evolutivo es una técnica iterativa basada en poblaciones de individuos e inspirada en las reglas de la evolución natural para encontrar (o explorar) el conjunto de puntos, en un espacio de búsqueda, que mejor se ajustan a una situación dada de acuerdo con una función de coste. Delante de cualquier problema, en prácticamente todas las situaciones, se necesita explorar un conjunto de posibles soluciones donde cada una de ellas se puede evaluar. Por tanto, los Algoritmos Evolutivos se pueden entender como una técnica de optimización si tenemos una función de coste que determine la bondad del ajuste.
Como para cualquier técnica iterativa, es esencial disponer de un criterio de parada.
En el caso de los métodos de optimización, el algoritmo habría de parase en el momento en el que ha llegado a su estado estacionario y por tanto ya no se podrán mejorar los resultados. Determinar la fiabilidad de las condiciones de parada de un algoritmo evolutivo es de gran importancia. Un criterio de parada débil o equivocado puede afectar negativamente tanto al esfuerzo computacional como al resultado final.
En esta tesis introducimos un marco estadístico para determinar cuándo una condición de parada es capaz de parar el Algoritmo Evolutivo en el momento en el que llegue a su estado estacionario. Por una parte, se presenta una aproximación numérica a los estados estacionarios para detectar el momento en el cual la población de individuos del algoritmo evolutivo ha perdido su diversidad. Esta aproximación se ha aplicado a diferentes métodos de computación evolutiva que están basados en la diversidad y a una selección de funciones que cubren las propiedades más relevantes respecto a la convergencia de los algoritmos evolutivos. Los experimentos muestran que la condición presentada funciona independientemente de la dimensión del espacio de búsqueda y del perfil de la función de coste. También muestran que el método Differential Evolution (DE) figura como el mejor paradigma entre los algoritmos evolutivos para aplicar el método de parada. Por otra parte, utilizamos un modelo de regresión lineal para determinar los requisitos que aseguran que una medida derivada de la población evolutiva del algoritmo evolutivo está relacionada con la distancia al óptimo en el espacio de búsqueda. El marco teórico presentado se analiza para diferentes funciones de un conjunto de funciones marco y para dos criterios de parada estándar basados en la mejora del valor de la función de coste y en la distribución en el espacio de búsqueda de la población de individuos para cada método de los algoritmos evolutivos. Los resultados validan el marco estadístico presentado como una buena herramienta para determinar la capacidad de una medida para parar el algoritmo evolutivo y selecciona la medida basada en la distribución de la población como la más conveniente para aplicaciones en casos reales.The goal of this Thesis is assessing the quality of existing stopping conditions for terminating Evolutionary Algorithms at its steady state. An Evolutionary Algorithm (EA) is an iterative population based technique based on natural evolution rules principles to find (or explore) in a given search space the set of point that best fits a given real situation according to a cost function. When a problem is presented in practically all situations, an exploration of a set of possible solutions is needed and for each possible solution its goodness is valuable. EAs can be viewed as an optimization technique if a function is given. As any iterative technique, a stop criterion for terminating EA numeric implementation is mandatory. In the case of optimization methods, the algorithm should stop at the time it has reached a steady state so it can not improve results anymore. Assessing the reliability of termination conditions for evolutionary algorithms is of prime importance. A wrong or weak stop criterion can negatively affect both the computational effort and the final result. In this Thesis, we introduce a statistical framework for assessing whether a termination condition is able to stop EA at its steady state. In one hand a numeric approximation to steady states to detect the point in which EA population has lost its diversity has been presented for EA termination. This approximation has been applied to different EA paradigms based on diversity and a selection of functions covering the properties most relevant for EA convergence. Experiments show that our condition works regardless of the search space dimension and function landscape and Differential Evolution (DE) arises as the best EA paradigm. On the other hand, we use a regression model in order to determine the requirements ensuring that a measure derived from EA evolving population is related to the distance to the optimum in x-space. Our theoretical framework is analyzed across several benchmark test functions and two standard termination criteria based on function improvement in function space and EA population x-space distribution for the DE paradigm. Results validate our statistical framework as a powerful tool for determining the capability of a measure for terminating EA and select the x-space distribution as the best-suited for accurately stopping DE in real-world applications.
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Bartholomew, Ian David. "Hydrology and dynamics of a land-terminating Greenland outlet glacier." Thesis, University of Edinburgh, 2012. http://hdl.handle.net/1842/7613.
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The purpose of this thesis is to investigate the hydrology and dynamics of a land-terminating outlet glacier on the western margin of the Greenland Ice Sheet (GrIS). The investigations are motivated by uncertainty about the effect of meltwater on rates of ice flow in the GrIS and the possibility that hydrologically forced changes in ice velocity might increase mass loss from the ice sheet significantly in response to climate warming. The impact of meltwater on fluctuations in ice flow has been a research focus for glaciologists studying Alpine and Arctic glaciers for decades. In these settings, one of the main controls on the relationship between surface melting and ice velocity is the structure of the subglacial drainage system, which evolves spatially and temporally on a seasonal basis in response to inputs of meltwater from the glacier surface. In this thesis we present three years of field observations of glacier velocity, surface ablation and hydrology from a land-terminating glacier in west Greenland. These data are supplemented by satellite data and the use of simple models to constrain surface melting. We find that hydrologically forced ice acceleration occurs each year along a 115 km transect, first at sites nearest the ice sheet margin and at locations further inland following the onset of surface melting at higher elevations. At sites near the ice sheet margin, the relationship between surface melting and ice velocity is not consistent throughout the melt season, and ice velocity becomes less sensitive to inputs of meltwater later in the summer. This is explained by development in the efficiency of the subglacial drainage system, in a manner similar to Alpine glaciers. We perform a hydrological study which indicates that an efficient subglacial drainage system expands upglacier over the course of the melt season, in response to inputs of water from the ice sheet surface. At higher elevation sites, however, thicker ice and colder temperatures mean that it is harder to generate enough water to reach the ice-bed interface and this only occurs once enough water has accumulated to propagate fractures through thick ice to the bed. One mechanism which allows this is drainage of supraglacial lakes. Inter-annual comparison shows that increased rates of annual ablation lead to higher annual ice velocities. At high elevation sites (>1000 m), timing of drainage of meltwater to the ice-bed interface appears to be the main control on the the overall magnitude of summer acceleration. At lower elevations, although development in the structure of the subglacial drainage system limits the overall summer acceleration signal, short-term variability in meltwater input can sustain high ice velocities even once the subglacial drainage system has become channelised. Overall, the research presented in this thesis suggests that hydrologically-forced acceleration can increase mass loss from the GrIS in a warmer climate due to inland expansion of the area of the ice sheet bed which is subject to inputs of meltwater from the ice sheet surface. The relationship between surface melting and ice velocity is mediated, however, by the structure of the subglacial drainage system and variations in the rate of meltwater drainage to the ice bed interface. Insights from this work can help in the development of numerical ice sheet models which aim to predict the future contribution to sea-level rise from the Greenland Ice Sheet.
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Bovitz, Gregory Lowell. "Porkbusters in congress : the electoral politics of terminating distributive programs /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC IP addresses, 1999. http://wwwlib.umi.com/cr/ucsd/fullcit?p9945688.
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Francisco, Teresa Wise. "Adolescents' Experiences With Terminating Relationships With Perpetrators of Perinatal Abuse." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1243879369.
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Andrikonis, Julius. "Effective Method to Obtain Terminating Proof-Search in Transitive Multimodal Logics." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2011. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2011~D_20111227_091412-58067.
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In the dissertation epistemic logics with central agent interaction axiom are analysed. The research covers multimodal logics Kn, Tn, K4n and S4n. The aim of the work is finite derivation search sequent calculi for the mentioned logics. A new method to obtain the termination of derivation search is presented in the thesis and this method is applied to the mentioned logics as well as to monomodal logics K4 and S4.Disertacijoje nagrinėjamos žinių logikos su centrinio agento sąveikos aksioma. Tyrimas apima multimodalines logikas Kn, Tn, K4n ir S4n. Disertacijos tikslas – baigtinės išvedimo paieškos sekvenciniai skaičiavimai minėtoms logikoms. Darbe pristatomas naujas išvedimo paieškos baigtinumą užtikrinantis metodas, kuris yra pritaikomas minėtoms logikoms, o taip pat monomodalinėms logikoms K4 ir S4.
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Svensson, Carl Edward. "Collectivity in A 60 nuclei, superdeformed and smoothly terminating rotational bands." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape9/PQDD_0022/NQ51016.pdf.
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Svensson, Carl Edward. "Collectivity in A ~ 60 nuclei : superdeformed and smoothly terminating rotational bands /." *McMaster only, 1998.
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Tuck, Christopher. "Terminating confrontation : British strategy and the conflict with Indonesia 1963-66." Thesis, University of Reading, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.542263.
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Streuff, Katharina Teresa. "Glacimarine sedimentary processes and products at fjord-terminating tidewater glacier margins." Thesis, Durham University, 2017. http://etheses.dur.ac.uk/12520/.
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Tidewater glaciers terminate in the ocean and provide an important link between the terrestrial and marine realm, which makes them particularly vulnerable to both atmospheric and oceanographic changes. Tidewater glacier dynamics are affected by sea-level rise, which, in combination with ocean warming, can amplify glacier retreat. Most glaciers that drain the large contemporary ice sheets of Greenland and Antarctica are marine-terminating, fast-flowing outlets, and the dynamics of these glaciers have a large impact on ice sheet stability and sea level. Understanding how such glaciers have responded to climate change in the past therefore provides an important analogue for assessing current and future changes of the large ice sheets in Greenland and Antarctica. Fjords have proven to be very useful in this context, as their protected environment allows for the accumulation of thick, undisturbed sedimentary sequences, which enable the investigation of past ice sheet change at a high temporal resolution. This study uses multibeam swath-bathymetry, sub-bottom profiler data, and sediment cores from fjords in Spitsbergen and West Greenland to investigate the glacial landforms and sedimentary facies in front of fjord-terminating tidewater glaciers. The identified landform-sediment assemblages are compared to other High-Arctic fjords and are summarised in a new conceptual model. They are used to infer common sedimentary processes in glacimarine environments, to identify the factors controlling them, and to reconstruct Holocene regional ice dynamics. The results demonstrate that while the sedimentary processes are largely similar between the different regions, differences arise in the landform-sediment assemblages, even between adjacent fjords. This implies that glacier dynamics are not simply controlled by changes in the air or ocean temperatures, but can be highly variable in space and time.
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Yang, Wei-Ning. "Multivariate estimation and variance reduction for terminating and steady-state simulation /." The Ohio State University, 1989. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487672631602302.
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Sakai, Masahiko, Kouji Okamoto, and Toshiki Sakabe. "Innermost Reductions Find All Normal Forms on Right-Linear Terminating Overlay TRSs." Elsevier, 2003. http://hdl.handle.net/2237/9248.
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Davis, Andrew D. (Andrew Donaldson). "Prediction under uncertainty : from models for marine-terminating glaciers to Bayesian computation." Thesis, Massachusetts Institute of Technology, 2018. https://hdl.handle.net/1721.1/121812.
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Thesis: Ph. D. in Computational Science and Engineering, Massachusetts Institute of Technology, Department of Aeronautics and Astronautics, 2018Cataloged from PDF version of thesis.
Includes bibliographical references (pages 255-266).
The polar ice sheets have enormous potential impact on future global mean sea level rise. Recent observations suggest they are losing mass to the ocean at an accelerated rate. Skillful prediction of the ice sheets' future mass loss remains difficult, however; observations of key variables are insufficient and physical processes are poorly understood. Even when a relatively accurate dynamical model is available, computational limitations make it difficult to characterize uncertainties associated with the model's predictions. To address this prediction challenge, this thesis presents complementary developments in glaciology and in Bayesian computation.
In particular, (i) we develop new models of marine-terminating glaciers whose dynamics are controlled by an extended set of physical processes and geometric constraints; and (ii) we develop new sampling algorithms to efficiently characterize selected marginals of a high-dimensional probability distribution describing uncertain parameters. The latter algorithms have broader utility in Bayesian modeling and inference with computationally intensive models. We begin by studying laterally confined ice streams that terminate in the ocean, where they may form floating ice shelves. Such marine-terminating outlet glaciers are the main conduits by which Greenland and Antarctica drain their ice mass into the ocean. Ice shelves play an important role in buttressing the grounded inland ice. The seaward ice flow is typically accompanied by acceleration and thinning. Increased thinning eventually leads to flotation of the ice supported by buoyant forces from the ocean.
The transition region from grounded to floating ice is referred to as the grounding line (or zone), and the mass transport across the grounding line as the output flux. Previous work by Weertman (1974) and Schoof (2007) considers laterally unconfined ice streams, showing that their output flux is a monotonically increasing function of the bedrock rock depth at the grounding line. This scenario leads to the marine ice sheet instability (MISI): retreating into deeper water increases the output flux, and retreat accelerates. Therefore, stable steady states cannot exist on downward sloping beds. We extend this analysis to laterally confined glaciers and investigate when side-wall drag is sufficient to stabilize glaciers on downward sloping beds. Additionally, we include a parameterization of sub-shelf melt. We find that, whereas lateral drag can stabilize glaciers that would otherwise be subject to the MISI, sub-shelf melt can destabilize them.
Our ultimate goal is to predict future ice sheet volume and to quantify its uncertainty. We do so in the Bayesian statistical setting, conditioning our prediction on available observations. Yet characterizing a posterior distribution-using, for example, Markov chain Monte Carlo (MCMC)-involves repeated evaluations of an ice stream model, which are prohibitively expensive. Furthermore, the model parameters that need to be inferred are high dimensional, even though we are primarily interested in a low dimensional quantity: the future ice volume. We address this computational challenge by developing new structure-exploiting Monte Carlo methods that combine marginalization with surrogate modeling. Given a high-dimensional (posterior) distribution on the model parameters, whose density evaluations are computationally intensive, we construct an MCMC chain that directly targets a particular low-dimensional marginal of interest. In general, the marginal density is not available analytically.
Instead, we can compute unbiased noisy estimates of this density. Our MCMC algorithm incrementally constructs a local regression approximation of the target marginal density using these estimates. Continual refinement of the approximation, as MCMC sampling proceeds, leads to an asymptotically exact characterization of the desired marginal distribution. Analysis of the bias-variance tradeoff guides an ideal refinement strategy that balances the decay rates of different components of the error. Our approach exploits regularity in the marginal density to significantly reduce computational expense relative to both full-dimensional and pseudo-marginal MCMC.
by Andrew D. Davis.
Ph. D. in Computational Science and Engineering
Ph.D.inComputationalScienceandEngineering Massachusetts Institute of Technology, Department of Aeronautics and Astronautics
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Jeong, Seongsu. "Time Series Reconstruction of Surface Flow Velocity on Marine-terminating Outlet Glaciers." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1437602064.
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Kouchakzadeh, Salah. "The local scouring phenomenon at bridge abutments terminating in the floodplain zone." Thesis, University of Ottawa (Canada), 1996. http://hdl.handle.net/10393/9915.
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This study examines the local scouring phenomenon associated with bridge abutments exposed to combined main-channel (MC) and floodplain (FP) flows. The principal goal of the study was to develop and validate, based on a comprehensive physical-model testing programme that considered different abutment shapes, an improved relationship for predicting maximum scour depth. A relationship was established among sediment size, flow depth and longitudinal channel slope for initiating the threshold condition of bed material movement. This relationship facilitated the selection of sediment size and channel bed slope for the various experiments, which were performed in a compound channel under interacting (combined MC and FP flows) and non-interacting (isolated FP flow) conditions. Clear-water approach-flow conditions were utilized throughout the testing programme. A flow visualization technique was employed to study the various patterns of the combining flows in the MC/FP junction regions. It determined both the flow deflection angle and the extent of the influence zone (a portion of the channel width beyond the abutment) whose discharge, $Q\sb{w}$, contributes to the scour development. Maximum scour depths produced under interacting conditions were observed to be 15% to 30% greater than those observed for non-interacting conditions. This important observation clearly demonstrated the need to properly account for compound-channel effects in the simulation exercise. The scour prediction relationship presented herein is based on a dimensional analysis of the relevant parameters and incorporates the data obtained from the laboratory studies performed in a compound channel using vertical-wall, wing-wall, semi-circular, and spill-through abutment shapes. The model indicates a very good agreement between predicted and observed maximum scour depths for bridge abutments terminating in the FP zone.
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Kemp, Brian Lee. "Response and failure analysis of a graphite-epoxy laminate containing terminating internal plies." Thesis, Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/91127.
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A change in laminate thickness due to terminating internal plies acts as a stress riser for both intralamina and interlaminar stresses. This laminate configuration is referred to as a ply drop. The linear elastic, three-dimensional stress distributions in the vicinity of a ply drop are determined for a graphite-epoxy laminate subject to axial tension and compression by a finite element analysis. It is shown that the interlaminar stresses have a maximum magnitude at the ply drop-off, and decrease proceeding away from the drop-off. Two modes of failure initiation are analyzed. In the pure resin regions surrounding the dropped plies, the maximum stress criterion is assumed to govern failure. The Tsai-Wu criterion is used for intralamina failure prediction. The influence of two laminate lay-ups and a variety of ply drop geometries on the response and failure are presented.M.S.
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Tate, Rothwelle Joseph St John. "Molecular biology of signal terminating enzymes : identification and strructure-function relationships with signalling proteins." Thesis, University of Strathclyde, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.432629.
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Alpert, Steven M. "Assessing the level of service for shipments originating or terminating on short line railroads." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/38332.
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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, February 2007.Includes bibliographical references (p. [79]-[84]).
This thesis measures railroad freight trip time and trip time reliability for freight rail shipments involving short lines in 2006. It is based on an underlying MIT study commissioned by members of the short line railroading industry, including the American Short Line Rail Road Association, and RaiLinc Corporation, a company that provides many railroad-related services. The data for this thesis is provided by several short lines through RaiLinc Corporation, which gathers and releases the data. Data from a 90-day window is gathered for 39 shipping lanes spread amongst several short line railroads, with a total of 6,747 movements analyzed. In addition, two shipping lanes of 69 total movements that were provided for preliminary analysis are presented in greater detail. Two short lines have also provided their own multiyear data on car movements. The significant result of this thesis is that there is an average time from shipper to customer of 8.3 days per load, with a standard deviation of 4.3 days. There is an average 2-day percentage, or highest percentage of loads to arrive in any 2-day window, of 44.7%. These numbers represent a moderate increase in trip time and trip time unreliability from the 1990-1991 numbers presented by a 1995 trip time study.
by Steven M. Alpert.
S.M.
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Serdar, Lucas D. "The Functional Relationship between the Nonsense-Mediated mRNA Decay Pathway and the Prematurely Terminating Ribosome." Case Western Reserve University School of Graduate Studies / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=case1554304118763865.
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Moffat, Karen Ann. "Synthesis and evaluation of model initiator/reversible terminating adducts for the stable free radical polymerization process." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape10/PQDD_0002/NQ42755.pdf.
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Becker, Richard. "Terminating species and Lewis acid-base preference in oxohalides : a new route to low-dimensional compounds /." Doctoral thesis, Stockholm : Department of Inorganic Chemistry, Stockholm University, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-1414.
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Koester, Alexandria Jo. "Rapid thinning of the Laurentide Ice Sheet in coastal Maine, USA during late Heinrich Stadial 1:." Thesis, Boston College, 2017. http://hdl.handle.net/2345/bc-ir:107308.
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Thesis advisor: Jeremy D. ShakunFew data are available to infer the thinning rate of the Laurentide Ice Sheet (LIS) through the last deglaciation, despite its importance for constraining past ice sheet response to climate warming. We measured 31 cosmogenic 10Be exposure ages in samples collected on coastal mountainsides in Acadia National Park and from the slightly inland Pineo Ridge moraine complex, a ~100-km-long glaciomarine delta, to constrain the timing and rate of LIS thinning and subsequent retreat in coastal Maine. Samples collected along vertical transects in Acadia National Park have indistinguishable exposure ages over a 300 m range of elevation, suggesting that rapid, century-scale thinning occurred at 15.2 ± 0.7 ka, similar to the timing of abrupt thinning inferred from cosmogenic exposure ages at Mt. Katahdin in central Maine (Davis et al., 2015). This rapid ice sheet surface lowering, which likely occurred during the latter part of the cold Heinrich Stadial 1 event (19-14.6 ka), may have been due to enhanced ice-shelf melt and calving in the Gulf of Maine, perhaps related to regional oceanic warming associated with a weakened Atlantic Meridional Overturning Circulation at this time. The ice margin subsequently stabilized at the Pineo Ridge moraine complex until 14.5 ± 0.7 ka, near the onset of Bølling Interstadial warming. Our 10Be ages are substantially younger than marine radiocarbon constraints on LIS retreat in the coastal lowlands, suggesting that the deglacial marine reservoir effect in this area was ~1,200 14C years, perhaps also related to the sluggish Atlantic Meridional Overturning Circulation during Heinrich Stadial 1
Thesis (MS) — Boston College, 2017
Submitted to: Boston College. Graduate School of Arts and Sciences
Discipline: Earth and Environmental Sciences
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Walsh, Kaitlin M. "Changes in the Marine-Terminating Glaciers of Central East Greenland, 2000-2010, and Potential Connections to Ocean Circulation." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1306512126.
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Hennig, Anne [Verfasser], Ignacio [Gutachter] Rubio, Stefan [Gutachter] Lorkowski, and Reinold [Gutachter] Schäfer. "Investigation of the mechanisms terminating growth factor induced Ras activation / Anne Hennig ; Gutachter: Ignacio Rubio, Stefan Lorkowski, Reinold Schäfer." Jena : Friedrich-Schiller-Universität Jena, 2016. http://d-nb.info/1177611708/34.
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Roberts, Zoe J. "Design and application of novel biodegradable chain extenders and surface-tuneable hyperbranched chain terminating agents in thermoplastic polyurethane elastomers." Thesis, University of Warwick, 2017. http://wrap.warwick.ac.uk/107841/.
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This thesis is in two distinct sections. In the first section, novel diketopiperazines are synthesised and incorporated as chain extenders into thermoplastic polyurethane elastomers and the resulting mechanical, thermal and degradative properties are analysed. In the second section, hyperbranched chain terminating agents are synthesised from 1,1’-carbonyldiimidazole in a one-pot process and the potential applications of fluorinated hyperbranched chain terminating agents are investigated. Chapter 1 has three parts. First, the synthesis and applications of polyurethanes are introduced and the current market trends and growth projections are discussed. Secondly, an overview of current literature covering biodegradable polymers focusing on the incorporation of amino acids into polyurethanes and their potential applications is presented. Thirdly, hyperbranched polymers are introduced and a focus is made on the synthesis of isocyanate and non-isocyanate polyurethanes and polyureas. In chapter 2, the use of the dipeptides of tyrosine and glutamic acid as chain extenders in polyurethane synthesis is explored. The dipeptide of glutamic acid is modified to incorporate a higher content of ester and amide degradable linkages with aromatic character that form comparable chain extenders to tyrosine dipeptide. Their use in the organocatalysed step-growth polymerisation of novel thermoplastic polyurethane elastomers is described. In chapter 3, the resulting tyrosine and glutamic acid-derived thermoplastic polyurethane elastomers are utilised to explore the variation of thermal, mechanical and degradative properties of a range of polymer compositions. In chapter 4, the synthesis of novel hyperbranched materials polymerised in a one-pot, temperature-controlled sequential synthesis incorporating aromatic or fluorinated functional chain ends from both carbonylbiscaprolactam and 1,1’-carbonyldiimidazole precursors is described. In chapter 5, 1,1’-carbonyldiimidazole derived hyperbranched polymers are incorporated into an existing thermoplastic polyurethane formulation and the surface properties are studied by varying polymer composition. In chapter 6, the significant findings and conclusions are summarised. In chapter 7, the experimental methods used are set out.
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Samuel, Welsh. "Applying GIS to Investigate the Spatial Variability of Sub-Glacial Hydrology under Land Terminating Ice Sheets in Western Greenland Ice Sheet." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-305434.
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With continued warming regional surface air temperatures around the Artic in recent decades, there is growing importance in understanding how ice sheet dynamics interact with a shifting global climate system. This research investigates the spatial variability of sub-glacial hydrology under land terminating ice sheets in Western GrIS, when applying varying overburden ice pressures within Shreve’s (1972) hydraulic potential equation. The application of ArcGIS is used with adjusted k-values in the equation to route hydrological network systems under the ice sheet and help identify the processes taking place within the sub-glacial system. With focus on processes such as water piracy, we are able illustrate the effects that water at the base can have on ice sheet behaviors. i.e. velocity and mas balance. The findings conclude that the ice sheet is operating under conditions at its base with a k-value somewhere within the range of 0.9 to 1.1. This assumption is based on comparisons between modelled pro-glacial output with observed data taken from studies by Mikkelsen et al. (2014) and Smith et al. (2015), using input melt data at the surface (Lindback et. al., 2015). At this level of hydraulic potential, water piracy is effectively changing the course pathways of the hydrological network and therefore manipulating the size and shape of the sub-glacial catchments. As a result, discharge may leave the glacier from a different location than what would be assumed. Identifying the location and volume of water under particular ice sheets, compared to neighboring ice sheets, can be used to explain spatial and temporal differences in ice sheet characteristics. Such research is important in understanding both environmental and socio-economic implications at local to global scale. Although the application of GIS methodology is extremely useful is producing such results, it must be recognised that a high level of uncertainty and error exists in the data results.Temperatur kan ha en särskilt stark inverkan på hur istäcken (glaciärer) beter sig. Även om det är väl känt att temperaturerna ökar både globalt och runt Arktis så har vi bara börjat förstå vikten av effekten av detta på glaciärer. Med ökande temperaturer har vi börjat se att en ökad avsmältning och en ökad mängd smältvatten i glaciala system kan ändra sättet en ismassa beter sig. Ett exempel på en sådan förändring är en ökad hastighet som ismassan rör sig i eftersom vatten fungerar som ett glidmedel mellan glaciären och den underliggande marken. Var vattnet finns under isen påverkar var istäcket rör sig. Man tror att en ökning i hastighet vid vissa delar av istäcket kan ledda till att det tunnas ut. Med tiden lämnar en allt större mängd vatten systemet vilket bidrar till mindre, retirerande glaciärer och en höjning av den globala havsytenivån då vattnet via vattendrag till slut rinner ut i havet. I den här studien användes ett kartläggningsprogram, Geografiskt Informationssystem (GIS), för att förutsäga var flodsystem under isen befinner sig. Detta kartläggningsprogram används eftersom dessa regioner inte är tillgängliga för observationer i fält. Tjockleken på istäcket som ligger ovanpå flodsystemet utövar ett tryck på vattnet och gör att det kan flöda emot gravitationen och i riktningar och med hastigheter som inte är typiska för flodsystem i varmare klimat. Denna process kallas vattenavlänkning. I denna studie används en ekvation i GIS för att variera trycket från det ovanliggande istäcket. Genom att ändra detta ändras hur stor vattenavlänkningen blir och därför även vilken väg vattnet tar under isen. Denna teknik tillåter oss att se vilken väg vattnet tar från att det kommer in i systemet vid toppen av istäcket till var det lämnar systemet genom vattendrag nedströms. Genom att veta var vattnet befinner sig kan man utröna varför isen rör sig annorlunda gentemot omkringliggande istäcken, och därför också dess påverkan på omgivande miljö såväl som sociala konsekvenser. Även om detta är en väldigt användbar metod för att kartlägga kanalsystem så finns det osäkerheter, till exempel i hur resultatet stämmer överens med verkliga scenarion. Så även om detta är användbart för att förstå teorin bakom processerna så är resultatet kanske inte helt tillförlitligt.
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Chernos, Matthew. "The relative importance of calving and surface ablation at a lacustrine terminating glacier : a detailed assessment of ice loss at Bridge Glacier, British Columbia." Thesis, University of British Columbia, 2014. http://hdl.handle.net/2429/50182.
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Bridge Glacier is a lacustrine calving glacier located in the southern Coast Mountains and terminates in a 6.2 km² proglacial lake. The glacier has retreated more than 3.55 km up-valley since 1984, the majority of the retreat having occurred since 2003. While surface melt may have contributed to the retreat, calving allowed for an additional annual volume of ice loss. The relative contributions from surface melt and calving to the total volume of ice loss is examined for the 2013 melt season. Surface melt is quantified using on-glacier meteorological data to drive a distributed energy balance model. The calving flux is quantified using field measurements of lake bathymetry, terminus area change, and ice thickness. Calving flux estimates are completed by daily measurements of terminus surface velocity derived from manual feature tracking using oblique time lapse camera imagery. Calving accounts for 23% of the total ice loss in the 2013 melt season, suggesting that surface melt is the main driver of mass loss at Bridge Glacier.
Data from the 2013 field season is used to inform historical calving flux and surface melt estimates from 1984 to 2013. The calving flux is minor until 1991, at which point the glacier terminus achieves flotation, and begins to discharge large tabular icebergs. Calving was characterized by large, multi-annual retreats, alternating with periods of relative stability. The calving flux peaked from 2005 to 2010, when it was roughly equal to the mass loss due to surface melt. Calving was a much smaller contributor of mass loss from Bridge Glacier, except for a transient high-calving period in the late 2000s. Looking forward, Bridge Glacier will retreat into shallower water where the terminus will no longer float, and calving losses should decrease substantially. Although calving losses will become an increasingly minor portion of the mass balance, future retreat is expected at Bridge Glacier due to a legacy of dynamic thinning brought about by its transient calving phase.Arts, Faculty of
Geography, Department of
Graduate
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Girgin, Sertan. "Abstraction In Reinforcement Learning." Phd thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608257/index.pdf.
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Reinforcement learning is the problem faced by an agent that must learn behavior through trial-and-error interactions with a dynamic environment. Generally, the problem to be solved contains subtasks that repeat at different regions of the state space. Without any guidance an agent has to learn the solutions of all subtask instances independently, which degrades the learning performance.
In this thesis, we propose two approaches to build connections between different regions of the search space leading to better utilization of gained experience and accelerate learning is proposed. In the first approach, we first extend existing work of McGovern and propose the formalization of stochastic conditionally terminating sequences with higher representational power. Then, we describe how to efficiently discover and employ useful abstractions during learning based on such sequences. The method constructs a tree structure to keep track of frequently used action sequences together with visited states. This tree is then used to select actions to be executed at each step.
In the second approach, we propose a novel method to identify states with similar sub-policies, and show how they can be integrated into reinforcement learning framework to improve the learning performance. The method uses an efficient data structure to find common action sequences started from observed states and defines a similarity function between states based on the number of such sequences. Using this similarity function, updates on the action-value function of a state are reflected to all similar states. This, consequently, allows experience acquired during learning be applied to a broader context.
Effectiveness of both approaches is demonstrated empirically by conducting extensive experiments on various domains.
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Rutter, Karen. "Termination." Master's thesis, University of Cape Town, 2008. http://hdl.handle.net/11427/11596.
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Includes bibliographical references.Termination is a genre novel which follows a contemporary crime fiction format. It adheres closely to the narrative shape of modem mystery books, containing the essential elements which constitute a work in this field. With a few twists. Contemporary crime fiction can follow a couple of paths along the way to solving a misdemeanour. Which is usually a murder. The protagonist is either on the spot and in the plot by virtue of his/her job. In other words, they could be a cop, forensic specialist, medical examiner, private investigator etc. Or they could be drawn reluctantly into a scenario, by circumstance or due to an over-developed sense of "doing the right thing."
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Cropper, Nick I. "Effective termination techniques." Thesis, University of St Andrews, 1997. http://hdl.handle.net/10023/13453.
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An important property of term rewriting systems is termination: the guarantee that every rewrite sequence is finite. This thesis is concerned with orderings used for proving termination, in particular the Knuth-Bendix and polynomial orderings. First, two methods for generating termination orderings are enhanced. The Knuth-Bendix ordering algorithm incrementally generates numeric and symbolic constraints that are sufficient for the termination of the rewrite system being constructed. The KB ordering algorithm requires an efficient linear constraint solver that detects the nature of degeneracy in the solution space, and for this a revised method of complete description is presented that eliminates the space redundancy that crippled previous implementations. Polynomial orderings are more powerful than Knuth-Bendix orderings, but are usually much harder to generate. Rewrite systems consisting of only a handful of rules can overwhelm existing search techniques due to the combinatorial complexity. A genetic algorithm is applied with some success. Second, a subset of the family of polynomial orderings is analysed. The polynomial orderings on terms in two unary function symbols are fully resolved into simpler orderings. Thus it is shown that most of the complexity of polynomial orderings is redundant. The order type (logical invariant), either r or A (numeric invariant), and precedence is calculated for each polynomial ordering. The invariants correspond in a natural way to the parameters of the orderings, and so the tabulated results can be used to convert easily between polynomial orderings and more tangible orderings. The orderings of order type are two of the recursive path orderings. All of the other polynomial orderings are of order type w or w2 and each can be expressed as a lexicographic combination of r (weight), A (matrix), and lexicographic (dictionary) orderings. The thesis concludes by showing how the analysis extends to arbitrary monadic terms, and discussing possible developments for the future.
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Geser, Alfons [Verfasser]. "Relative termination / Alfons Geser." Ulm : Universität Ulm. Fakultät für Ingenieurwissenschaften und Informatik, 2012. http://d-nb.info/102529386X/34.
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Ottman, M. J., and B. R. Tickes. "Alfalfa Irrigation Termination, Yuma." College of Agriculture, University of Arizona (Tucson, AZ), 1994. http://hdl.handle.net/10150/201407.
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Alfalfa irrigation is often withheld as a water conservation measure in Arizona. The objective of this research was to test the hypothesis that alfalfa yield and stand can be permanently damaged by withholding irrigation water. Irrigation was terminated during the summer (July through October) or winter (November through February) on a Superstition sand in Yuma. Summer irrigation termination reduced plant density from 4 to 1.5 plants per square foot and reduced hay yield from 0.76 to 0.27 tons per acre per cutting after irrigation was resumed. Winter irrigation termination had no residual effect on yield or plant density. Termination of alfalfa irrigation can permanently damage stands and reduce yield on sandy soil.
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Ottman, M. J., and R. L. Roth. "Alfalfa Irrigation Termination, Maricopa." College of Agriculture, University of Arizona (Tucson, AZ), 1994. http://hdl.handle.net/10150/201408.
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Alfalfa irrigation is often withheld as a water conservation measure in Arizona. The objective of this research was to test the hypothesis that alfalfa can be permanently damaged by withholding irrigation water. Irrigation was terminated during the summer (July or August through September) or summer through winter (July or August through mid -March) on a Casa Grande sandy loam at Maricopa. Irrigation termination at Maricopa was not detrimental to stand although hay yields were depressed from 1.47 to 1.28 tons per acre following the second cycle of summer irrigation termination and from 1.57 to 1.23 tons per acre per cutting following summer through winter irrigation termination. Alfalfa water use was reduced by irrigation termination even after irrigation was resumed. Total nonstructural carbohydrates in the roots were never less than the control during irrigation termination but decreased relative to normally irrigated alfalfa when irrigation resumed.
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Wright, Joanna Jane. "Studies on transcriptional termination." Thesis, University of Edinburgh, 1987. http://hdl.handle.net/1842/11960.
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Kirtikar, Shantanu. "Termination of an axis." Thesis, Virginia Polytechnic Institute and State University, 1992. http://hdl.handle.net/10919/52120.
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“Architecture does not exist, only the spirit of architecture exists. What has presence is a work of architecture which should be made in a way that is worthy of an offering to architecture.” Louis Kahn.Master of Architecture
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Woods-Henderson, Christine Ione. "An exploratory investigation of termination : the development of the counselor termination behavior inventory /." The Ohio State University, 1985. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487262825074848.
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Sakai, Masahiko. "CLASSES WHOSE TERMINATION IS DECIDABLE." INTELLIGENT MEDIA INTEGRATION NAGOYA UNIVERSITY / COE, 2006. http://hdl.handle.net/2237/10414.
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Blidner, Aron. "Predicting termination from behavioral consultation." Thesis, McGill University, 2002. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=79287.
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The main objective of this study was to investigate whether parental perceptions of the emotional, behavioral and social skills functioning of children with conduct problems, differed for parents who completed the behavioral consultation process (N = 40) compared to those who prematurely withdrew ( N = 11). A series of between group analyses were conducted to examine whether parental perceptions existed. Parents who prematurely withdrew from the behavioral consultation process reported significantly greater incidences of anxious and depressed behavior in children, than parents who remained in consultation F(1,49) = 4.24, p = .0448. Similarly, using the Wilks' criterion, overall estimates of emotional and behavioral functioning, combined with social skills functioning were also significantly affected by group membership, F(3,47) = 3.22, p = .0310. Using the same variables in a logistic regression analysis, a test of the full model with all three predictors compared to the constant only model was statistically reliable phi2 (3, N = 51) = 10.26, p = .0336, indicating that the predictors, as a set, reliably distinguished the perceptions of those who completed the consultation process, compared to those who prematurely withdrew. This model accurately predicted 77.7% of parents' group membership. The results of the study will be discussed in terms of their usefulness for future consultants to identify families at risk for prematurely withdrawing from the consultation process, so that additional resources can be offered to encourage their continued participation in the consultation process.
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Woods, J. D. W. "Gas Dynamic Flow Pipe terminations." Thesis, Queen's University Belfast, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.517649.
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Gale, Sarah Jane. "Band termination spectroscopy of '1'5'7Er." Thesis, University of Liverpool, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240568.
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