Tesis sobre el tema "Decay stage"
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Hart, Sarah Jane. "The early stage of wood decay : wood/fungus interaction and its attraction to xylophagous Coleoptera, especially cerambycids and their hymenopteran parasitoids". Thesis, Imperial College London, 2013. http://hdl.handle.net/10044/1/11146.
Texto completoKazkaz, Kareem. "Finding excited-state decays of Germanium-76 /". Thesis, Connect to this title online; UW restricted, 2006. http://hdl.handle.net/1773/9660.
Texto completoMendive, Tapia David. "Computational modelling of excited state decay in polyatomic molecules". Thesis, Imperial College London, 2013. http://hdl.handle.net/10044/1/11149.
Texto completoDoss, Natasha. "Calculated final state probability distributions for T₂ β-decay measurements". Thesis, University College London (University of London), 2007. http://discovery.ucl.ac.uk/1445423/.
Texto completoZhou, Jian-huai. "Photoconductivity decay and recombination in hydrogenated amorphous silicon films". Thesis, University of Cambridge, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240172.
Texto completoAl-Jaghoub, Mahmoud Ismail. "Decay and final-state interaction effects of near-threshold #omega# production". Thesis, University College London (University of London), 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.362385.
Texto completoHayer, Anna. "Excited state formation, stabilisation and decay in polymer light-emitting diodes". Thesis, University of Cambridge, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.613996.
Texto completoMartínez, Llinàs Jade. "Photonic systems with multiple delay times: synchronization, square-ware switching and state-dependent delay". Doctoral thesis, Universitat de les Illes Balears, 2016. http://hdl.handle.net/10803/401423.
Texto completoEsta tesis doctoral se centra en el estudio teórico y numérico de sistemas fotónicos con realimentación y múltiples líneas de retardo, en el límite en el que los tiempos de retardo son mucho más grandes que las escalas de tiempo intrínsecas del sistema. Se consideran dos sistemas ópticos con realimentación: i) dos osciladores optoelectrónicos (OEOs) mutuamente acoplados con retardo y ii) un láser de semiconductor con retardo dependiente del estado mediante el filtrado frecuencial desde dos cavidades con diferentes longitudes y frecuencias centrales. Aunque estos dos sistemas tienen en común la presencia de múltiples líneas de retardo, se trata de dos sistemas bastante diferentes. En el primero en todo momento intervienen dos tiempos de retardo. En el segundo, en cambio, la luz toma una única línea de retardo en cada momento; en este sistema, el valor del retardo es seleccionado intrínsicamente por el estado del sistema entre dos valores diferentes mediante el filtrado frecuencial de la luz desde dos filtros con diferentes frecuencias centrales colocados en dos cavidades de diferente longitud. Por un lado, se modelizan estos sistemas y se desarrollan métodos analíticos para encontrar soluciones aproximadas. Estos métodos podrían utilizarse para comprender la dinámica de otros sistemas con retardo. Por otro lado, se contrastan los resultados analíticos o experimentales con simulaciones numéricas. La tesis está dividida en cuatro partes. Las partes I, II y IV contienen varios capítulos, mientras que la parte III está formada por un solo capítulo. La parte I, Introducción, objectivos, herramientas y resultados anteriores , está dividida en tres capítulos: En el Capítulo 1, primero se introducen algunos ejemplos de sistemas en los cuales la presencia de retardos determina las propiedades dinámicas del sistema, en algunos casos dando lugar a comportamiento complejo. A continuación se presenta el problema general de un sistema con retardo y su modelización con ecuaciones diferenciales con retardo. Se explican dos ejemplos en detalle, incluyendo su modelización con ecuaciones diferenciales con retardo. Luego se introduce el régimen dinámico de oscilación periódica de tipo onda cuadrada que se puede obtener con OEOs y otros sistemas con retardo, y se resaltan algunas aplicaciones de estas ondas cuadradas, como el control del período y la codificación de información. El capítulo termina con un resumen de los objetivos de la tesis. En el Capítulo 2, se introducen algunos métodos numéricos y teóricos usados en esta tesis, como el análisis de estabilidad lineal, métodos y herramientas para el estudio de la estabilidad de soluciones periódicas, y algoritmos para integrar numéricamente las ecuaciones diferenciales con retardo. El Capítulo 3 está dedicado al estudio de la dinámica de sistemas sencillos en los que se basan los sistemas estudiados en esta tesis: un único OEO y un láser de semiconductor con realimentación óptica. En cada caso, se describe en detalle el sistema, se introduce su modelización con ecuaciones diferenciales con retardo, y se presentan sus diferentes regímenes dinámicos y posibles aplicaciones. La parte II está dedicada a la Sincronización en osciladores optoelectrónicos mutuamente acoplados con retardo y contiene cuatro capítulos: En el Capítulo 4, se describe el sistema de dos OEOs mutuamente acoplados y con dos tiempos de retardo diferentes, el de la propia realimentación y el del acoplamiento. Primero se derivan las ecuaciones dinámicas del sistema. A continuación se escriben las ecuaciones dinámicas en forma adimensional y se calcula la solución estacionaria estática (punto fijo) del sistema. Finalmente se introduce el caso de OEOs idénticos, se simplifican las ecuaciones dinámicas y se demuestra que el análisis de estabilidad lineal de la solución cero da lugar a soluciones periódicas sincronizadas en fase y en antifase. El Capítulo 5 se centra en la generación de pulsos simétricos de onda cuadrada mediante el sistema de dos OEOs idénticos mutuamente acoplados con retardo descrito en el capítulo 4, en el caso de realimentacion negativa, la cual tiende a reducir el efecto de las perturbaciones del estado etacionario estático. Primero se aplica el método de estabilidad lineal para obtener el período de las soluciones oscilatorias en función de la relación entre los dos tiempos de retardo diferentes. Se demuestra que múltiples soluciones periódicas de tipo onda cuadrada en fase coexisten cuando la razón entre el tiempo de retardo intrínseco y el del acoplamiento satisface una relación racional entre dos números impares. De manera similar, múltiples ondas cuadradas en antifase con diferentes períodos pueden coexistir cuando la razón entre el tiempo de retardo intrínseco y el del acoplamiento es un racional impar/- par. A continuación, se aplican métodos asintóticos para obtener mapas para la amplitud de las soluciones. Se demuestra que las ondas cuadradas periódicas experimentan una ruta al caos del tipo doblamiento de período. Después se analiza el efecto de cambiar ligeramente los valores de los parámetros en la forma de las soluciones. Finalmente, a partir del cálculo preciso del período de las soluciones, se observa un fenómeno de división del período en diferentes valores. El Capítulo 6 está dedicado a la aparición de pulsos de onda cuadrada estables con el mismo modelo que en el Capítulo 5 pero en el caso de realimentación positiva, la cual tiende a aumentar el efecto de las perturbaciones del estado etacionario estático. Las ondas cuadradas que surgen con realimentación positiva tienen un ciclo asimétrico y son más flexibles y robustas que las obtenidas con realimentación negativa; en particular, la asimetría de su ciclo les permite adaptar su forma en respuesta a cambios en los valores de los parámetros en vez de experimentar un doblamiento de período. Primero se aplica el análisis de estabilidad lineal del estado estacionario estático para obtener el período de las ondas cuadradas de mayor frecuencia en función de la relación entre los dos tiempos de retardo diferentes. Se demuestra que el sistema tiene soluciones sincronizadas en fase y en antifase, y que múltiples soluciones pueden coexistir, de manera similar al caso de realimentación negativa. Sin embargo, a diferencia del caso de realimentación negativa, aquí las soluciones en antifase siempre coexisten con soluciones en fase con diferentes períodos. Además, este sistema tiene soluciones periódicas de menor frecuencia, sincronizadas en fase y coexistiendo con las soluciones cuadradas rápidas para los mismos valores de los parámetros. A continuación se aplica un método asintótico para determinar la amplitud y forma de las ondas cuadradas. Se demuestra que el ciclo de las ondas cuadradas generadas con realimentación positiva se puede controlar cambiando el voltaje constante aplicado a los OEOs, manteniendo el período constante. También se analiza el efecto de variar ligeramente los valores de los parámetros en la forma de las soluciones. Se demuestra que las ondas cuadradas generadas con realimentación positiva son más robustas frente a cambios en los valores de los parámetros que las obtenidas con realimentación negativa. Finalmente, a partir del cálculo preciso del período de las soluciones, se demuestra que el período de las soluciones se divide en diferentes valores. En el Capítulo 7, se considera el caso de OEOs no idénticos, incluyendo las posibilidades de realimentación negativa, positiva y mixta. Se demuestra que este sistema puede generar múltiples ondas cuadradas, con diferentes tipos de sincronización (en fase, en antifase y a un cuarto del período) dependiendo del signo de la realimentación de cada oscilador. Las ondas cuadradas con sincronización a un cuarto del período aparecen principalmente cuando la realimentación es negativa para un oscilador y positiva para el otro. Finalmente se analiza la robustez de las soluciones sincronizadas a un cuarto del período frente a pequeños cambios en los valores de los parámetros. La parte III se centra en el tema Sistemas fotónicos con retardos que dependen del estado y está formada per un único capítulo: En el Capítulo 8, se considera un sistema de láser de semiconductor con filtrado frecuencial desde dos cavidades de longitudes y frecuencias centrales diferentes, como prototípico para estudiar la dinámica de un sistema con retardo que depende del estado. Primero se introduce el diseño experimental, basado en un láser de semiconductor con realimentación filtrada desde dos filtros de Bragg con diferentes frecuencias centrales y situados en dos cavidades de diferetes longitudes, y por lo tanto asociados a diferentes tiempos de retardo. Se demuestra que la dinámica de este sistema se caracteriza por saltos erráticos entre los dos valores del tiempo de retardo. A continuación se introduce un modelo teórico con filtrado lorenciano desde dos cavidades diferentes. Se calculan las soluciones estacionarias y se analiza la dinámica errática con retardo que depende del estado para diferentes valores de los parámetros. Se demuestra que los resultados numéricos en el régimen errático concuerdan de forma cualitativa con los resultados experimentales. También se demuestra que este sistema tiene soluciones más regulares, similares a las ondas cuadradas, con retardo dependiente del estado. Finalmente se analiza la estadística de los tiempos de residencia durante los que el retardo toma un valor constante. La parte IV, Resumen y perspectivas de trabajo , contiene dos capítulos de conclusiones: el Capítulo 9, correspondiente a la parte de los OEOs; y el Capítulo 10, referido a la parte de sistemas fotónicos con retardos dependientes del estado. En estos capítulos, se resumen los principales resultados obtenidos y se proponen algunas perspectivas de trabajo para futuras investigaciones.
This PhD thesis focuses on the theoretical and numerical study of photonic systems with feedback from multiple delay lines, in the limit in which the delay times are much longer than the intrinsic time scales of the system. Two optical systems with feedback are considered: i) two mutually delay-coupled optoelectronic oscillators (OEOs) and ii) a semiconductor laser with a delay time that depends on the state of the system via the filtered feedback from two cavities with different length and central frequency. Although these two systems have in common the presence of multiple delay lines, they are indeed quite different. In the former, two different delay times take part at any time. In the latter, in contrast, light takes a single delay line at any time; in this system, the delay time value is intrinsically selected among two different values by the state of the system since the frequency of light is selectively filtered by using two filters of different central frequencies placed in two cavities of different lengths. On the one hand, these systems are modelled and analytical methods are developed to find approximate solutions. These methods could be used to understand the dynamics of other systems with delay. On the other hand, extensive numerical simulations are compared to analytical or experimental results. The thesis is divided into four parts. Parts I, II and IV contain several chapters, whereas part III has a single chapter. Part I, Introduction, objectives, tools and previous results , is divided in three chapters: In Chapter 1, some examples of systems in which the presence of delays determines the dynamical properties of the system, often giving rise to complex behavior, are first introduced. After that, the generic problem of a system with delay and its modelling with delay differential equations is presented. Two examples are explained in detail, including their modelling with delay differential equations. Then, the square-wave periodic regime that can be obtained with OEOs and other systems with delay is introduced, and some applications of the square-wave regime are highlighted, such as the control of the period and information encoding. The chapter ends with a summary of the objectives of the thesis. Chapter 2 introduces some analytical and numerical methods and tools used in this thesis, such as the linear stability analysis, methods and tools for the study of the stability of periodic solutions, and algorithms to integrate numerically delay differential equations. Chapter 3 is devoted to the study of the dynamics of simple systems in which the systems studied in this thesis are based: a single OEO and a semiconductor laser with optical feedback. In each case, the system is described in detail, its modelling with delay-defferential equations is introduced, and its different dynamical regimes and possible applications are presented. Part II is devoted to the Synchronization in mutually delay-coupled optoelec- tronic oscillators and contains four chapters: Chapter 4 describes the system of two mutually delay-coupled OEOs with two different delay times, the self-feedback delay time and the coupling delay time. First, the dynamical equations of the system are derived. After that, the equations are writen in non-dimensional form and the steady state (fixed point) of the system is found. Finally, the case of identical OEOs is introduced, the dynamical equations are simplified and it is shown that the linear stability analysis of the zero solution gives rise to periodic solutions synchronized in phase and out of phase. Chapter 5 focuses on the generation of symmetric square-wave pulses by the system of two identical mutually delay-coupled OEOs described in Chapter 4, in the case of negative feedback, which tends to reduce the effect of the perturbations of the steady state solution. First, linear stability analysis is applied to obtain the period of the solutions as a function of the ratio between the two different delay times. It is shown that multiple in-phase square waves with different periods can coexist when the ratio between the self-feedback and the cross-feedback delay times satisfies a rational relationship involving two odd numbers. Similarly, multiple outof- phase square waves with different periodicity can coexist when the ratio between the self- and the cross-delay times is an odd/even rational. After that, asymptotic methods are applied to obtain maps for the amplitude of the solutions. It is found that the symmetric square-wave periodic solutions undergo a period doubling route to chaos. Then, the effect of the parameter mismatch in the form of the solutions is analyzed. Finally, a splitting of the period in different values is demonstrated by performing a precise calculation of the period of the solutions. Chapter 6 is devoted to the emergence of stable square-wave pulses with the system described in Chapter 4 in the case of positive feedback, which tends to amplify the effect of the perturbations of the steady state solution. The square waves arising with positive feedback have an asymmetric duty cycle and turn out to be more flexible and robust than those obtained with negative feedback; in particular, the asymmetry of their duty cycle allows them to adapt their shape in response to changes in the parameter values instead of undergoing a period doubling. First, the linear stability analysis of the steady state is applied to obtain the period of the oscillatory solutions as a function of the two different delay times. It is shown that the system has stable in- and out-of-phase synchronized solutions, and that several solutions can coexist, similarly to the case of negative feedback. Nevertheless, in contrast to the negative feedback case, here out-of-phase solutions always coexist with in-phase solutions with different periods. Furthermore, this system has limit cycles of lower frequency, synchronized in phase and coexisting with the aforementioned fast square waves for the same values of the parameters. After that, an asymptotic method is applied to determine the amplitude and the shape of the square waves. It is shown that the duty cycle of the square waves generated with positive feedback can be tuned with the constant voltage applied to the OEOs, while the total period remains constant. The effect of the parameter mismatch on the form of the solutions is also analyzed. It is found that the square waves generated with positive feedback are more robust to parameter mismatch than those obtained with negative feedback. Finally, a splitting of the period in different values is demonstrated by performing a precise calculation of the period of the solutions. Chapter 7 addresses the case of two non-identical OEOs, including the possibilities of negative, positive, and mixed feedback. It is shown that this system can generate multiple square-wave solutions, with different kinds of synchronization (in-phase, out-of-phase, or at a quarter of the period) depending on the sign of the feedback on each oscillator. The square waves with synchronization at a quarter of the period mainly appear when the feedback is negative for one oscillator and positive for the other one. Finally, the robustness of the solutions synchronized at a quarter of the period to parameter mismatch is analyzed. Part III focuses on the topic Photonic systems with state-dependent delays and contains a single chapter: In Chapter 8, a semiconductor laser system with frequency filtering from two cavities of different lengths and central frequencies is considered as prototypical to study the dynamics of a system with state-dependent delay. First, the experimental setup is presented. It is based on a semiconductor laser with filtered feedback from two Bragg filters of different central frequencies placed in two cavities of different lengths, and thus associated to different delay times, experiencing erratic jumps between the two delay-time values. Then, a theoretical model with lorentzian filtering from different cavities is introduced. The stationary solutions are calculated and the erratic dynamics with state-dependent delay is analyzed for different parameter values. It is shown that numerical results in the erratic regime are in qualitative agreement with the experiments. It is also shown that this system has more regular solutions, similar to the square waves, with state-dependent delay. Finally, the switching statistics is analyzed from the residence times during which the delay time remains constant. Part IV, Summary and future work , contains two concluding chapters: Chapter 9, corresponding to the part of OEOs; and Chapter 10, associated to the part of photonic systems with state-dependent delays. In these chapters, the main results are summarized and some perspectives of future work are proposed.
Stewart, Beverly. "Computational chemistry applied to the excited state decay of molecular photonic devices". Thesis, University of Newcastle Upon Tyne, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.538922.
Texto completoDavies, Simon I. "Generation and decay of quantised vortices in ultra-pure helium-4 below 200mK". Thesis, Lancaster University, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.268153.
Texto completoU, Eddy. "Professional degeneration and political decay Shanghai schoolteachers and the Socialist state, 1949-1968 /". online access from Digital dissertation consortium access full-text, 2001. http://libweb.cityu.edu.hk/cgi-bin/er/db/ddcdiss.pl?3019838.
Texto completoNiecknig, Johanna [Verfasser]. "Final-state interactions in heavy-meson decays / Johanna Niecknig". Bonn : Universitäts- und Landesbibliothek Bonn, 2018. http://d-nb.info/1167856953/34.
Texto completoNoah, Ramsey S. "Bimolecular recombination and complete photocurrent decay in metallophthalocyanine thin films". California State University, Long Beach, 2013.
Buscar texto completoDracopoulos, John. "The influence of shear on the triplet state decay of chromophores in synthetic polymers". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0001/MQ44161.pdf.
Texto completoYoon, Do Yeon. "A continuous-time multi-stage noise-shaping delta-sigma modulator with analog delay". Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/75689.
Texto completoCataloged from PDF version of thesis.
Includes bibliographical references (p. 73-75).
A new continuous-time multi-stage noise-shaping delta-sigma modulator has been designed. This modulator provides high resolution and robust stability characteristics which are the primary advantages of the conventional multi-stage noise-shaping architecture. At the same time, previous critical challenges that degraded the overall performance of multi-stage noise-shaping delta-sigma modulators are eliminated through several unique techniques. Additionally, these techniques relax the requirements of each component of the proposed delta-sigma modulator. As a result, this new delta-sigma modulator architecture can provide several advantages that are not obtainable in other modulator architectures.
by Do Yeon Yoon.
S.M.
Bucci, Robert Joseph. "Molecular based identification of wood decay fungi from two field sites in Mississippi". Master's thesis, Mississippi State : Mississippi State University, 2008. http://library.msstate.edu/etd/show.asp?etd=etd-06182008-141603.
Texto completoYilmaz, Umit Oktay. "The Polarization Properties Of The Final State Particles In The Rare Radiative B-meson Decay". Phd thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12606100/index.pdf.
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l+l- decay by using the most general model independent form of the effective Hamiltonian is presented. The total and the differential branching ratios for these decays, when photon is in the positive and negative helicity states, are studied. The sensitivity of "
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and the longitudinal, transverse and normal polarization asymmetries of final state leptons, as well as lepton-antilepton combined asymmetries in Bs &
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l+l- decay to the new Wilson coefficients are also investigated. It is shown that all these physical observables are very sensitive to the existence of new physics beyond SM and their experimental measurements can give valuable information about it.
Pakhlova, G., I. Adachi, H. Aihara, K. Arinstein, V. Aulchenko, T. Aushev, A. M. Bakich et al. "Observation of the Ψ(4415)→ D\bar{D}_2^* (2460) Decay Using Initial-State Radiation". American Physical Society, 2008. http://hdl.handle.net/2237/11347.
Texto completoLee, Ian R. (Ian Richard) 1953 Carleton University Dissertation Political Science. "The Canadian postal system: origins, growth and decay of the state postal function, 1765-1981". Ottawa.:, 1989.
Buscar texto completoCheng, Kin On. "A multi-stage optical switch with output buffer using WDM for delay lines sharing /". View Abstract or Full-Text, 2003. http://library.ust.hk/cgi/db/thesis.pl?ELEC%202003%20CHENG.
Texto completoIncludes bibliographical references (leaves 77-79). Also available in electronic version. Access restricted to campus users.
Shivakumaraiah, Lokesh. "Automated mapping of clocked logic to quasi-delay insensitive circuits". Master's thesis, Mississippi State : Mississippi State University, 2007. http://sun.library.msstate.edu/ETD-db/ETD-browse/browse.
Texto completoBenedito, Antone dos Santos. "Multi-stage population models applied to insect dynamics". Botucatu, 2020. http://hdl.handle.net/11449/192335.
Texto completoAbstract: This thesis presents two manuscripts previously sent to publication in scientific journals. In the first manuscript, a delay differential equation model is developed to study the dynamics of two Aedes aegypti mosquito populations: infected by the intracellular bacteria Wolbachia and non-infected (wild) individuals. All the steady states of the system are determined, namely extinction of both populations, extinction of the infected population and persistence of the non-infected one, and coexistence. Their local stability is analyzed, including Hopf bifurcation, which promotes periodic solutions around the nontrivial equilibrium points. Finally, one investigates the global asymptotic stability of the trivial solution. In the second manuscript, after rearing soybean looper Chrysodeixis includens in laboratory conditions, thermal requirements for this insect-pest are estimated, from linear and nonlinear regression models, as well as the intrinsic growth rate. This parameter depends on the life-history traits and can provide a measure of population viability of the species.
Doutor
O'Farrell, Hayley. "Temporal modelling of disease outbreaks using state space and delay differential equations". Thesis, University of Surrey, 2016. http://epubs.surrey.ac.uk/809649/.
Texto completoMäntyniemi, A. (Antti). "An integrated CMOS high precision time-to-digital converter based on stabilised three-stage delay line interpolation". Doctoral thesis, University of Oulu, 2004. http://urn.fi/urn:isbn:951427461X.
Texto completoMaximowitsch, Egle [Verfasser] y Tatiana [Akademischer Betreuer] Domratcheva. "Molecular mechanisms of spectral tuning and excited-state decay in phytochrome photoreceptors / Egle Maximowitsch ; Betreuer: Tatiana Domratcheva". Heidelberg : Universitätsbibliothek Heidelberg, 2020. http://d-nb.info/1210647702/34.
Texto completoFeldmaier, Matthias [Verfasser] y Jörg [Akademischer Betreuer] Main. "Phase-space resolved decay rates of driven systems near the transition state / Matthias Feldmaier ; Betreuer: Jörg Main". Stuttgart : Universitätsbibliothek der Universität Stuttgart, 2020. http://d-nb.info/1220692832/34.
Texto completoBramburger, Jason. "Steady State/Hopf Interactions in the Van Der Pol Oscillator with Delayed Feedback". Thèse, Université d'Ottawa / University of Ottawa, 2013. http://hdl.handle.net/10393/24325.
Texto completoMorales, Tolentino Zang Daniela [Verfasser]. "Final state interactions in strong two-body baryon decays / Daniela Morales Tolentino Zang". Bonn : Universitäts- und Landesbibliothek Bonn, 2014. http://d-nb.info/1077288883/34.
Texto completoZhang, Zhengyang. "A class of state-dependent delay differential equations and applications to forest growth". Thesis, Bordeaux, 2018. http://www.theses.fr/2018BORD0062/document.
Texto completoThis thesis is devoted to the studies of a class of state-dependent delay differential equations. This class of equations is derived from a size-structured model.The motivation comes from the parameter fittings of this system to a forest simulator called SORTIE. Cases of both single species forest and two-species forest are considered in Chapter 2. The numerical simulations of the system correspond relatively very well to the forest data generated by SORTIE, which shows that this system is able to be used to describe the population dynamics of forests. Moreover, an extended model considering the spatial positions of trees is also proposed in Chapter 2 for the two-species forest case. From the numerical simulations of this spatial model one can see the diffusion of forests in space. Chapter 3 and 4 focus on the mathematical analysis of the state-dependent delay differential equations. The properties of semiflow generated by this system are studied in Chapter 3, where we find that this semiflow is not time-continuous. The boundedness and dissipativity of the semiflow for both single species model and multi-species model are studied in Chapter 4. Furthermore, in order to study the population dynamics after the introduction of parasites into a forest, a predator-prey system consisting of the above state-dependent delay differential equation (describing the forest) and an ordinary differential equation (describing the parasites) is constructed in Chapter 5 (only the single species forest is considered here). Numerical simulations in several scenarios and cases are operated to display the complex behaviours of solutions appearing in this system with the predator-prey relation and the state-dependent delay
Boutin, David. "First direct observation of bound-state beta-decay measurements of branching and lifetime of 207 Tl 81+ fragments /". Darmstadt : GSI, 2005. http://deposit.d-nb.de/cgi-bin/dokserv?idn=978036662.
Texto completoKang, Xian-Wei [Verfasser]. "Chiral Dynamics and Final State Interactions in Semileptonic B Meson Decay and Antinucleon-Nucleon Scattering / Xian-Wei Kang". Bonn : Universitäts- und Landesbibliothek Bonn, 2014. http://d-nb.info/1238687415/34.
Texto completoTomida, Natsuki. "Search for η’-nucleus bound states from ¹²C(γ, p) reaction with simultaneous detection of decay products". Kyoto University, 2020. http://hdl.handle.net/2433/258972.
Texto completoMagpantay, Felicia Maria. "On the stability and numerical stability of a model state dependent delay differential equation". Thesis, McGill University, 2012. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=106523.
Texto completoDans cette thèse, l'équation différentielle à retard (DDE) modèle d'état dépendant suivante est considérée,epsilon.u'(t) = mu.u(t) + sigma.u(t-a-c.u(t)).Pour epsilon, a et c fixés, la région de stabilité analytique de cette équation est connue et est la même pour le retard constant (c=0) ainsi que pour l'état de retard dépendant (c non nulle). Différentes approches sont utilisées pour prouver directement la stabilité dans certaines parties de cette région analytique pour la DDE d'état dépendant: d'abord en utilisant un argument de Gronwall, puis en utilisant une méthode de Lyapunov-Razumikhin qui est une généralisation du travail de Barnea [6] qui considère le cas mu = c = 0. Les régions de paramètres dans lesquelles la stabilité est prouvée par ces méthodes contiennent la partie entière de retard indépendant de la région de stabilité analytique et certaines parties de la portion de retard dépendant. Ces méthodes sont ensuite étendues pour montrer la stabilité de la méthode d'Euler arrière avec interpolation linéaire appliquée à la DDE modèle. En utilisant la méthode de Lyapunov-Razumikhin, la stabilité est prouvée dans des regions de paramètres plus grandes qui dépendent du pas de discrétisation, mais qui contiennent toujours la région trouvée pour la DDE. Des expressions analytiques pour les régions dans lesquelles les méthodes Theta générales sont stables ont également été tirées et évaluées numériquement. Dans le dernier chapitre d'un nouveau schéma pour intégration numérique des DDE scalaires avec des multiples retards d'état dépendant est présenté. Ce schéma est basé sur des méthodes de Runge-Kutta singulièrement et diagonalement implicites (SDIRK) afin de résoudre des problèmes raides tels que l'équation ci-dessus avec des petites valeurs de epsilon. En raison de la nature des méthodes SDIRK, s'il n'y a pas de chevauchement, alors à chaque iteration un ensemble d'équations scalaires sont résolues, une par une, en utilisant un algorithme de bissection de Newon. Des nouvelles extensions continues qui sont polynomiales par morceaux sont choisies pour accompagner le schéma SDIRK afin de ne pas détruire la structure SDIRK dans les cas de chevauchement et pour éviter le problème des piques quand il y a un changement brusque de la solution numérique.
MacKeigan, Linda Dawn. "Context effects in health state utility assessment: Etiology, framing, and delay of health outcomes". Diss., The University of Arizona, 1990. http://hdl.handle.net/10150/185266.
Texto completoKing, Shiva. "Measurement of the double beta decay half-life of ¹⁰⁰Mo to the 0⁺₁ excited state, and ⁴⁸Ca to the ground state in the NEMO 3 experiment". Thesis, University College London (University of London), 2009. http://discovery.ucl.ac.uk/15784/.
Texto completoSchwindt, Thomas [Verfasser]. "Evidence for the Higgs Boson Decay to tau+ tau- in the Lepton + Hadrons Final State with ATLAS / Thomas Schwindt". Bonn : Universitäts- und Landesbibliothek Bonn, 2015. http://d-nb.info/1077289472/34.
Texto completoKenzie, Matthew. "Properties of the Higgs-like state around 125 GeV in its decay into two photons at the CMS experiment". Thesis, Imperial College London, 2014. http://hdl.handle.net/10044/1/24976.
Texto completoTeklishyn, Maksym. "Measurement of the η c (1S) production cross-section via the decay η c to proton-antiproton final state". Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112224/document.
Texto completoThis thesis addresses a study of the η c (1S) charmonium state using decays to proton-antiproton final state at the LHCb experiment. The production cross-section of the η c meson in parton interactions and in b-hadron decays are reported. Production of the η c (1S) state is measured via the decay to ppbar with the LHCb detector, using an integrated luminosity of 0.7 fb⁻¹ accumulated at 7 TeV centre-of-mass energy in 2011, and an integrated luminosity of 2 fb⁻¹ accumulated at 8 TeV centre-of-mass energy in 2012. The measurements are performed using the J/ψ → ppbar decay as a reference channel. High centre-of-mass energies available in proton-proton collisions at the LHC allow models describing charmonium production to be tested. We distinguish promptly produced charmonia from those originating from b-hadron decays. Promptly produced charmonia include charmonia directly produced in parton interactions and those originating from the decays of heavier quarkonium states, which are in turn produced in parton interactions. Prompt charmonium production comprises direct production in the parton interaction and charmonium originating from decays of heavier states. The relative rate of prompt production of the η c and J/ψ states in the LHCb acceptance (rapidity range 2.0 < y < 4.5) and for p T (J/ψ , η c ) > 6.5 GeV/c is measured for the first time to be σ (η c) /σ (J/ψ) = 1.74 ± 0.29 stat ± 0.28 syst ± 0.18 B at a centre-of-mass energy 7 TeV, and σ (η c) /σ (J/ψ) = 1.60 ± 0.29 stat ± 0.25 syst ± 0.17 B at a centre-of-mass energy s = 8 TeV. Using the J/ψ production cross-section measured by LHCb and assuming no J/ψ polarization, the absolute η c prompt production cross-section in the same kinematic regime is found to be σ η c = 0.52 ± 0.09 stat ± 0.08 syst ± 0.06 σ J/ψ , B at a centre-of-mass energy 7 TeV, and σ η c = 0.59 ± 0.11 stat ± 0.09 syst ± 0.08 σ J/ψ , B at a centre-of-mass energy s = 8 TeV. The third error component corresponds to the uncertainty in the J/ψ → pp and η c → pp branching fractions and the J/ψ cross-section measurement. The relative η c to J/ψ inclusive branching fraction from b-hadron decays is measured to be B(b→η c X) /B(b→J/ψ X) = 0.42 ± 0.06 stat ± 0.02 syst ± 0.05 B. Using the J/ψ inclusive branching fraction from b-hadron decays measured with the J/ψ → μμ decay channel, the inclusive η c branching fraction from b-hadron decays is found to be B(b→η c X) = (4.9 ± 0.6 stat ± 0.3 syst ± 0.7 B) × 10 ⁻³ ,where the third error component corresponds to the uncertainty in the J/ψ → pp and η c → pp branching fractions (and the J/ψ inclusive branching fraction from b-hadron decays). The measurement of the relative η c inclusive branching fraction from b-hadron decays is the most precise to date. Using low-background sample of η c from b-hadron decays, the J/ψ and η c mass difference, ∆M J/ψ , η c = 114.7 ± 1.5 ± 0.1 MeV/c² , is measured. The value of the relative inclusive η c production to J/ψ is important for distinguishing between a variety of theoretical models. The η c cross-section is measured in bins of transverse momentum. It exhibits a similar behaviour to those obtained in the J/ψ production analysis, though with significantly larger uncertainties. The upper limits on the production of some other charmonium states are addressed
Benk, Véronique. "Effect of delay in initiating radiotherapy in patients with early-stage breast cancer : results of a natural experiment". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape9/PQDD_0020/MQ55038.pdf.
Texto completoPatel, Bhavin Ramesh. "State space formulation of TFEA & uncharted islands of instability in milling". Diss., Columbia, Mo. : University of Missouri-Columbia, 2007. http://hdl.handle.net/10355/4898.
Texto completoThe 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 January 7, 2008) Includes bibliographical references.
Vaheid, Halimeh. "Generation and Validation of di-Higgs events in the 4τ final state". Thesis, Uppsala universitet, Högenergifysik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-355744.
Texto completoNagpal, Charu. "A delay-efficient radiation-hard digital design approach using code word state preserving (cwsp) elements". Texas A&M University, 2008. http://hdl.handle.net/1969.1/85906.
Texto completoVALA, Ladislav. "Measurement of the 2\nu\beta\beta decay of ^100Mo to the excited 0^+_1 state in the NEMO3 experiment". Phd thesis, Université Paris Sud - Paris XI, 2003. http://tel.archives-ouvertes.fr/tel-00005471.
Texto completoFANTINI, GUIDO. "Search for Double Beta Decay of 130Te to the 0+ States of 130Xe with the CUORE Experiment". Doctoral thesis, Gran Sasso Science Institute, 2020. http://hdl.handle.net/20.500.12571/9989.
Texto completoWhitaker, Shree Yvonne. "A Biologically-Based Controlled Growth and Differentiation Model Using Delay Differential Equations: Development, Applications and Stability Analysis". NCSU, 2000. http://www.lib.ncsu.edu/theses/available/etd-20001120-152601.
Texto completoThis work investigates the development, applications and stability analysis of a biologically-based dose-response model for developmental toxicology. The biologically-based controlled growth and differentiation model is based on a model originally developed by Leroux et al. (1996). The original model had two basic states; precursor cells and differentiated cells with both states subject to a linear birth-death process. The research discussed in this dissertation describes the development of a mathematical model that is both biologically- and statistically-based. The model is developed with a highly controlled birth and death process for precursor cells. This model limits the number of replications allowed in the development of a tissue or organ and more closely reflects the presence of a true stem cell population. The mathematical formulation of the Leroux et al. (1996) model was derived from a partial differential equation for the generating function that limits further expansion into more realistic models of mammalian development. The same formulae for the probability of a defect (a system of ordinary differential equations) can be derived through the Kolmogorov forward equations due to the nature of this Markov process. This modified approach is easily amenable to the expansion of more complicated models of the developmental process. Comparisons between the Leroux et al. (1996) model and the controlled growth and differentiation (CGD) model are also discussed.The versatility of the CGD model is highlighted through a discussion of two general applications. The normal developmental process of spermatocytogenesis is investigated as the first application. Time delays are introduced into the system to more accurately mimic the development of male germ cells. As the second application, the spermatocytogenesis model is then altered to demonstrate a modeling strategy for hormesis. Asymptotic stability is investigated using the system of delay differential equations for spermatocytogenesis. The direct Lyapunov method for linear differential equations without delay is modified to establish delay-dependent stability conditions for delay differential equations with multiple delays. The stability conditions are expressed in terms of the existence of a positive definite solution to the Riccati matrix equations. Numerical simulations further verify the stability conditions.
Ramesh, Chithrupa, Henrik Sandberg y Karl Henrik Johansson. "Stability analysis of multiple state-based schedulers with CSMA". KTH, Reglerteknik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-111461.
Texto completoQC 20130116
Sidhu, Ragandeep Singh [Verfasser] y Yuri A. [Akademischer Betreuer] Litvinov. "Measurement of the bound-state beta decay of bare 205Tl81+ ions at the ESR / Ragandeep Singh Sidhu ; Betreuer: Yuri A. Litvinov". Heidelberg : Universitätsbibliothek Heidelberg, 2021. http://d-nb.info/1238076491/34.
Texto completoHanna, Molin. "Optimal steady-state design of bioreactors in series with Monod growth kinetics". Thesis, Uppsala universitet, Avdelningen för systemteknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-338760.
Texto completoBioreaktorer används för att utföra olika biologiska processer och används vanligen inom biogasproduktion eller för rening av avloppsvatten. Två vanliga hydrauliska modeller som används vid modellering av bioreaktorer är helomblandad bioreaktor (på engelska continuous stirred tank reactor, CSTR) eller pluggflödesreaktor (på engelska plug-flow reactor, PFR). I den här rapporten presenteras ett system av differentialekvationer som används för att beskriva koncentrationerna av substrat, biomassa och inert biomassa i både CSTR och PFR. Ekvationssystemet används för analys och design av en serie CSTRs vid steady-state. Tillväxten av biomassa beskrivs av Monod-kinetik. Avdödning av biomassa är inkluderat i studien. Från ekvationssystemet formulerades två optimeringsproblem som löstes för N CSTRs i serie och för CSTR+PFR. Det första optimerinsproblemet var att minimera substrathalten i utflödet givet en total volym. I det andra minimerades den totala volymen som krävs för att nå en viss substrathalt i utflödet. Resultaten visade att ekvationssystemet kan användas för att hitta den optimala volymsfördelningen som löser optimeringsproblemen. Den optimala volymen för N CSTRs i serie minskade när antalet CSTRs ökade. När N ökade konvergerade resultaten mot de för en CSTR sammankopplad med en PFR. En analys av hur avdödningshastigheten påverkade resultaten visade att en ökad avdödningshastighet gav mindre skillnad mellan de två olika konfigurationerna när den totala volymen hölls konstant. När den totala volymen istället minimerades ledde en ökad avdödningshastighet till att de två konfigurationerna divergerade från varandra. Modellen som presenteras i studien kan användas för att fördela en total reaktorvolym i mindre zoner på ett optimalt sätt och på så vis öka substratomvandlingen, något som kan vara av intresse i exempelvis befintliga avloppsreningsverk där utrymmet är begränsat. En relativt bra approximation till den optimala designen av N CSTRs i serie är att optimera volymerna för en CSTR+PFR, använda volymen för CSTR som första volym i konfigurationen med N CSTR i serie, och sedan fördela den kvarvarande volymen lika mellan de övriga zonerna.
Furutani, Eiko. "On State-Predictive Servo Controllers for Time-Delay Systems and Their Application to Blood Pressure Control". Kyoto University, 1996. http://hdl.handle.net/2433/77845.
Texto completoAkinbohun, Olugbenga John. "To ascertain why some women delay in seeking termination of pregnancy (TOP) for unwanted pregnancies in Lejweleputswa District (DC18), Free State". Thesis, University of the Western Cape, 2005. http://etd.uwc.ac.za/index.php?module=etd&.
Texto completoRegardless of the availability of choice of TOP, some pregnant women still present late (after 12 weeks) for TOP when the risks of complications and costs are higher. Women who present late for TOP usually have to be admitted to a district or regional hospital and managed. The costs at such institutions are high. TOPs before 12 weeks (early TOP) are done in a primary health care (PHC) facility (TOP center) and no admission is required hence less cost. Complications of early TOP are also very mild and rare. In Lejweleputswa district there is only one TOP Center (Kopano TOP Clinic) and this serves both Lejweleputswa and the Northern Free State districts. Early TOPs (less than 12 weeks) are done and completed at this center. Late TOPs (above 12 weeks but not more than 20 weeks) are initiated at this TOP center and referred to district or regional hospitals nearest to the patient&rsquo
s home, in both districts for completion.
Problems - An increasing number of women are seeking TOP service at late stages of pregnancies and the incidence of severe complications like severe bleeding, retained placenta, infection, amniotic fluid embolism, death etc, are increasing. The hospital&rsquo
s bed space and budget are stretched to the limit due to the influx of late term TOP to the hospitals. Lack of manpower, especially doctors, in these hospitals also create some problems, as the few doctors available have to attend to other ill patients as well. Sometimes bleeding TOP patients are transfused with blood and placed on a waiting list for theatre and this often increases the risk of complications. The emotional effect of late TOP on hospital staff (doctors and nurses) are enormous as the expelled fetus are much more developed than in early TOP where no fetus is seen at evacuation with simple Manual Vacuum Aspiration (MVA).