Essays about: "NLS"

Showing result 1 - 5 of 7 essays containing the word NLS.

  1. 1. Numerical simulation of the non-linear Schrödinger equation A comparative study based on the summation-by-parts method in space and time

    University essay from Uppsala universitet/Institutionen för informationsteknologi

    Author : Ibrohim Hamoud; [2023]
    Keywords : ;

    Abstract : In this work, we present the numerical implementation of various time marching methods based on the summation-by-parts (SBP) method for the time integration of nonlinear dispersive systems. More specifically, we consider the nonlinear Schrödinger (NLS) equation that accepts soliton or soliton-like solution as a primary case study. READ MORE

  3. 2. Airborne Angle-Only Geolocalization

    University essay from Linköpings universitet/Reglerteknik

    Author : Tove Kallin; [2021]
    Keywords : Angle-only; Bearing-only; Bearing; Geolocalization; Localization; Jammers; NLS; EKF; UKF; Cramér-Rao Lower Bound; Terrain; Elevation Data;

    Abstract : Airborne angle-only geolocalization is the localization of objects on ground level from airborne vehicles (AV) using bearing measurements, namely azimuth and elevation. This thesis aims to introduce elevation data of the terrain to the airborne angle-only geolocalization problem and to demonstrate that it could be applicable for localization of jammers. READ MORE

  4. 3. On the variational characterization of quasi-periodic standing waves of the nonlinear Schrödinger equation

    University essay from Lunds universitet/Matematik (naturvetenskapliga fakulteten)

    Author : Gustav Jillbratt; [2018]
    Keywords : Mathematics and Statistics;

    Abstract : We consider quasi-periodic standing wave solutions U(t, x) = exp(i(ωt−px))Ψ(x) to the one-dimensional defocusing cubic nonlinear Schrödinger equation, where we assume that Ψ : R → C is 2π−periodic. We study a constrained minimization problem associated with these solutions, and we show that solutions with minimal period of Ψ(x) strictly less than 2π cannot be minimizers, whereas locally the minimum is obtained among those solutions with minimal period 2π. READ MORE

  5. 4. “It won’t happen to me” VS “It could have been me” - Changes in health behavior initiated by a negative health shock to a peer

    University essay from Lunds universitet/Ekonomisk-historiska institutionen

    Author : Lise-Lotte Verhoef; [2017]
    Keywords : health behavior; peer effects; smoking; diet; exercise; Social Sciences; Business and Economics; Medicine and Health Sciences;

    Abstract : Despite being aware of the health risks associated with making “bad” health decisions, we seem to deny our personal vulnerability to the harmful effects of poor health behavior. Aiming to explore whether the harmful effects associated with poor health behavior are personalized once our peers suffer from them, reflected by improved health behavior and referred to as “peer effects”, this study uses individual-level U. READ MORE

  6. 5. Evaluation of Different Radio-Based Indoor Positioning Methods

    University essay from Linköpings universitet/Institutionen för systemteknik; Linköpings universitet/Tekniska högskolan

    Author : Sven Ahlberg; [2014]
    Keywords : Indoor positioning; TOA; TDOA; RSSI; cell-ID; AOA; fingerprinting; probability detection; UWB; Bluetooth; Wi-Fi; RFID;

    Abstract : Today, positioning with GPS and the advantages this entails are almost infinitive, which means that the technology can be utilized in a variety of applications. Unfortunately, there exists a lot of limitations in conjunction with the signals from the GPS can’t reach inside e.g. buildings or underground. READ MORE