Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 4674 for “"spread"”.
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Spatial spread of infectious diseases
… in the form of simple diffusion have on the spreading of infectious diseases. This study is undertaken within the context of the SI and SIR models, two of the most fundamental models for the propagation of infectious diseases. The diffusive SI and SIR models are supplemented with no flux …
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The simulation of fire growth and spread within enclosures using an integrated CFD fire spread model
… solid surfaces, etc. into a complete fire spread model. Shortcomings in the conventional six-flux radiation model are highlighted. These were demonstrated through a simple artificial test case and corrected in the modified six-flux model. The computational cost and accuracy of the six-flux …
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Studying wildfire spread using stationary burners
… to carefully study instabilities observed in spreading fires that suggest they play a critical role in fire spread. Two types of flow conditions were used to perform experiments similar to wildfire spread conditions: sloped fuel surface and forced-flow (wind aided). Small- scale inclined …
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Locational Spread Options with Stochastic Correlation
… correlation in modeling for locational spread options for natural gas. We first derive a model with Ornstein–Uhlenbeck process between two spread assets with constant correlation and then a combination of the Ornstein–Uhlenbeck and Jacobi process is used to model a stochastic …
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Compressive Measurement of Spread Spectrum Signals
Spread Spectrum (SS) techniques are methods used in communication systems where the spectra of the signal is spread over a much wider bandwidth. The large bandwidth of the resulting signals make SS signals difficult to intercept using conventional methods based on Nyquist sampling. Recently, a …
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Spatial spread of farm animal diseases
Data on cattle movements within the United Kingdom have recently become available. As part of the conditions for lifting an export ban on British beef following the bovine spongiform encephalopathy epidemic, the European Union required that the UK should have "An effective animal identification and …
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Flame spread through a solid fuel
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1963.
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Underwater acoustic communication over Doppler spread channels
… communication channels where the Doppler spread is more severe than the delay spread. An appropriate representation of the linear time- variant channel is introduced, and the wide sense stationary uncorrelated scattering (WSSUS) channel assumption enables characterization in terms of …
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Mathematical models for Tuberculosis spread in humans
… in case of an outbreak, the disease will not spread. Simulation results also shows that increasing the rate of treatment significantly reduces the value of the reproductive number. Hence, we concluded through this study that proper screening, early detection and a high treatment rate, leading …
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Computer Virus Spread Containment Using Feedback Control.
… connection is an important one to contain the spread. Based on the feedback model, this symptom is fed back and a state model using queuing theory is developed to delay the connections and slow down the rate of outgoing connections. Upon implementation of this model, whenever an infected …
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The Spread of Change in French Negation
<p>Many varieties of French have changed over the years from expressing predicate negation (Geurts 1998) with ne alone, to the embracing construction ne ... pas, and then to postverbal pas alone (Jespersen 1917). When the increase in the frequency of ne ... pas over time is plotted on a graph, it …
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Doppler spread estimation in mobile fading channels
The Doppler spread, or equivalently, the mobile speed, is a measure of the spectral dispersion of a mobile fading channel. Accurate estimation of the mobile speed is important in wireless mobile applications which require such as knowledge of the rate of channel variations. In this dissertation, …
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Point Spread Function Engineering in Fluorescence Spectroscopy
Die Synthese von Mikroskopie und Fluoreszenzspektroskopie hat das Mikroskop in ein vielseitiges Werkzeug zur funktionelle Analyse biologischer Systeme verwandelt. In dieser Arbeit wird untersucht, ob und wie kürzlich entwickelte Techniken zur Manipulation von Punktabbildungsfunktionen neue …
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Point Spread Function Engineering for Scene Recovery
… can be effectively characterized by their point spread functions (PSFs): the intensity distribution on an image sensor as a response to a point light source in a scene. This thesis explores the techniques to characterize, evaluate and optimize computational cameras via PSF engineering for …
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Crédito direcionado, impactos alocativos e spread bancário
… de subsídio cru- zado, para o aumento do spread bancário após a ativação da política de direcionamento a lá política brasileira. Apresenta-se na pesquisa uma ex- planação, pautada em um modelo de competição bancária, de quais e como surgem as distorções no mercado bancário após a …
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