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 247 for “"Planck"”.
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CMB analysis with ACT and Planck
… the Atacama Cosmology Telescope (ACT) and the Planck satellite. This includes extensive discussion of CMB analysis methods and the challenges in analysing these datasets individually and together, as well as presentation of new constraints on multiple cosmological models using these data. We …
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Fokker-Planck models and globular cluster evolution
… evolution using the orbit-averaged Fokker-Planck equation are compared with observations of the globular clusters M71 and NGC 6397. The first set of models studied includes a mass spectrum, a tidal boundary and allows for a central energy source from the formation, hardening and destruction …
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Relaxation to equilibrium for kinetic Fokker-Planck equation
… behaviour of solutions $f_t$ of kinetic Fokker-Planck equation in $\mathbb{R}^d$, namely their convergence towards equilibrium $f_\infty$ in the form \[ \textrm{d}(f_t,f_\infty)\leq C_1 e^{-C_2 t}\textrm{d}(f_0,\mu) \] for appropriate distances $\textit{d}$ and constants $C_1 \geq 1$, $C_2>0$. …
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The Fokker-Planck and Related Equations in Theoretical Population Dynamics
… of "white noise type", the SDE leads to a Fokker-Planck equation, a second order parabolic partial differential equation for the probability density function. Using separation of variables and simple transformations the Fokker-Planck equation reduces to a time independent ordinary differential …
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Quasi-Optical Modelling of Telescope Systems for Planck and STEAMR
… systems, with special attention paid to the Planck satellite, but further work is also performed on the Stratosphere-Troposphere Exchange And climate Monitor Radiome- ter (STEAMR) and the Far Infrared Instrument (FIRI). The primary work surrounds the modelling of far sidelobe (FSL) patterns …
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Tests of the Planck Cosmology at High and Low Redshifts
… the cosmic microwave background measured by the Planck satellite. There are, however, indications of features in the Planck power spectra, possible differences with high redshift ground-based CMB experiments, and ‘tensions’ between Planck and low redshift measurements of the Hubble constant and …
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Cosmology with Planck: an all-sky temperature and polarisation analysis
… by many experiments over the last decade. The Planck satellite was launched in 2009, observed the sky in temperature and polarisation, and released the nominal mission temperature data to the public in 2013. Planck has shed new light on CMB polarisation anisotropies and the polarisation signal …
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Solution of the Fokker-Planck Equation by Sequentially Optimized Meshfree Approximation
… thesis presents a technique to solve the Fokker-Planck equation by applica- tion of the Sequentially Optimized Meshfree Approximation (SOMA) method. It is well known that numerical solution of the Fokker-Planck equation is made di cult by the challenges of positivity enforcement, in nite domain, …
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Fokker -Planck Modeling of Spherical Inertial Electrostatic, Virtual -Cathode Fusion Systems
… solutions of the bounce-averaged Fokker-Planck equation in which the Maxwellian ion population---absolutely confined in the electrostatic well---is dominant correspond to lowest ion recirculation powers (and hence highest fusion energy gains). Also, it is shown that the square-well …
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A Dynamical Study of the Poisson-Nernst-Planck System for Three Ions
… The one-dimensional steady-state Poisson-Nernst-Planck (PNP) system is a useful representation of these devices, but experience shows that describing the reservoirs as boundary conditions is difficult. We study the PNP system for three types of ions with three regions of piecewise constant …
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Steady-State Poisson-Nernst-Planck Systems: Asymptotic expansions and applications to ion channels
… solution to the steady-state Poisson-Nernst-Planck system. In general, for nonlinear systems, it is impossible to obtain any representations of solutions. Due to the presence of a singular parameter in the PNP system, we can treat the system as a singularly perturbed problem. This system with …
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The integrated Sachs-Wolfe effect with Planck and the 2Mass Photometric Redshift Catalogue
… CMB data used are from the 2013 release from the Planck satellite, and the large-scale structure data are from the 2MASS Photometric Redshift Catalogue (2MPZ). The galaxy data were divided into redshift shells, and HEALPix was used to create pixelised maps of the CMB temperature anisotropies and …
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Efficient solution of the Fokker-Planck Equation via smooth particle hydrodynamics for nonlinear estimation
… is to solve the system's corresponding Fokker-Planck equation. The Fokker-Planck Equation (FPE) is the degenerate parabolic partial differential continuity equation that fully defines the evolution of the states' transition probability density function (PDF) over time. This also makes the …
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A framework for ship stability in a seastate using the state-space Fokker-Planck method
… Chief among them is the use of the Fokker-Planck equation (FPE), a deterministic partial differential equation governing the joint probability density function of the states of the SDE. The formulation for a rectangular barge rolling in beam waves is presented, with the approach readily …
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Mathematical and Deep Learning Methods in High-Energy Physics: From Temporal Variability in M82 ULXs to Spatial Features in Planck Maps
Modern Astronomy gathers data from a plethora of instruments from the ground and from space, spanning the entire electromagnetic spectrum and even some non-electromagnetic carriers of information, such as neutrinos and gravitational waves. The quality and quantity of data is rapidly increasing over …
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Drift-diffusion of a vacancy in inhomogeneous media and its material constants : a Fokker-Planck equation approach with an application to foreign exchange data
… mobility and diffusion coefficients of a Fokker-Planck equation describing a vacancy hopping in inhomogeneous media in one dimension under a directed stress. The study used the general master equation as a basis for a physical model because of the mesoscopic view that the change in average …
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Analysing M. avium-macrophage interactions and establishing a long-term infection in a novel and realistic model of lung alveolar macrophages, Max Planck Institute Cells
Mycobacterium avium Complex (MAC) are species of the non-tuberculous branch of the Mycobacteria family that is responsible for the development of pulmonary lung disease in immunocompromised individuals. One of the first lines of defence from the host involve a specialised group of tissue …
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Nonuniqueness of Laws on State and Path Space: Flow Selections and Superposition for Fokker-Planck-Kolmogorov Equations and Convex Integration for Stochastic Hypodissipative Navier-Stokes Equations
… In Parts I and II, we study parabolic Fokker--Planck--Kolmogorov equations (FPK equations), which are second-order differential equations for measures. In both parts, we prove structural results, which are of particular interest in cases of nonuniqueness of solutions.<br /><br /> More …
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