Essays about: "amplitudes"

Showing result 21 - 25 of 153 essays containing the word amplitudes.

  1. 21. Assessing the Extent of Diffuse Liver Disease: Quality Assurance of Magnetic Resonance Elastography (MRE)

    University essay from Umeå universitet/Institutionen för fysik

    Author : Anna Åkvist; [2022]
    Keywords : ;

    Abstract : The mechanical properties of liver tissue such as stiffness are closely correlated with various diseases. Magnetic resonance elastography (MRE) aims at estimating these mechanical properties by imaging the waves induced by an external driver in the liver. READ MORE

  3. 22. Towards Deep Learning Accelerated Sparse Bayesian Frequency Estimation

    University essay from Lunds universitet/Matematisk statistik

    Author : Mika Persson; [2022]
    Keywords : Bayesian Statistics; Deep Learning; Frequency Estimation; Generative Adversarial Networks; Artificial Neural Networks; Statistical Modelling; Mathematics and Statistics;

    Abstract : The Discrete Fourier Transform is the simplest way to obtain the spectrum of a discrete complex signal. This thesis concerns the case when the signal is known to contain a small (unknown) number of frequencies, not limited to the discrete Fourier frequencies, embedded in complex Gaussian noise. READ MORE

  4. 23. Calculating scattering amplitudes in φ3 and Yang-mills theory using perturbiner methods

    University essay from Uppsala universitet/Teoretisk fysik

    Author : Daniel Nilsson; Magnus Bertilsson; [2022]
    Keywords : QFT; Quantum; Quantum field theory; scattering amplitudes; Berends Giele Currents; feynman diagrams; n particle scattering;

    Abstract : We calculate tree-level scattering amplitudes in φ^3 theory and Yang-Mills theory by means of the perturbiner expansion. This involves solving the Euler-Lagrange equations of motion perturbatively via a multi-particle ansatz, and using Berends-Giele recursion relations to extract the solution from simple on-shell data. READ MORE

  5. 24. Lexical competition and predictive certainty in speech recognition: Modulations of pre-activation negativity amplitude by continuations, entropy and inhibition

    University essay from Lunds universitet/Masterprogram: Språk och språkvetenskap; Lunds universitet/Fonetik

    Author : Anna Hjortdal; [2022]
    Keywords : Speech perception; spoken word recognition; lexical competition; ERPs; PrAN.; Languages and Literatures;

    Abstract : A growing body of evidence suggests that speech recognition is facilitated by rapid activation of possible lexical candidates and subsequent competition and selection. An event-related potential (ERP) component 136-204 ms after word onset, the pre-activation negativity (PrAN), correlates with lexical competition. READ MORE

  6. 25. The Scattering matrix : Properties and one-dimensional examples

    University essay from Karlstads universitet/Fakulteten för hälsa, natur- och teknikvetenskap (from 2013)

    Author : Samuel Clarito; [2022]
    Keywords : ;

    Abstract : The scattering matrix is used to relate particle states before and after undergoing a scattering process. It is used in quantum mechanics, scattering theory and quantum field theory. When quantum theory got developed, the classical descriptions for scattering were no longer sufficient and other methods began to develop. READ MORE