Sökning: "Free boundary problem"

Visar resultat 1 - 5 av 29 uppsatser innehållade orden Free boundary problem.

1. 1. Symmetry in a free boundary problem

   Master-uppsats, KTH/Matematik (Avd.)

   Författare :Seuri Basilio Kuosmanen; [2023]
   Nyckelord :Analysis of PDEs; Bernoulli-type boundary condition; free boundary problem; Laplacian operator; method of moving planes; symmetry; Analys av PDEs; Bernoulli-typ randvärde; frirandsproblem; Laplaceoperatorn; moving-plane metoden; symmetri;

   Sammanfattning : We consider a variational formulation of a Bernoulli-type free boundary problem for the Laplacian operator with discontinuous boundary data. We show the existence of a weak solution to the problem. Moreover, we show that the solution has symmetry properties inherited by symmetric data. LÄS MER

3. 2. Evaluation of Physics Informed Neural Networks in engineering simple structural analysis problems

   Master-uppsats, Uppsala universitet/Institutionen för informationsteknologi

   Författare :Georgios Nentidis; [2023]
   Nyckelord :;

   Sammanfattning : Neural Networks have found many applications for a long time in Machine Learning in different disciplines, and have especially flourished in the last decade because of the ever-increasing processing power especially from GPUs. Because of their ability to operate as universal function approximators and model nonlinear processes, attempts have been made in recent years to be also used for modeling partial differential equation (PDE) solutions. LÄS MER

4. 3. Gravity water waves over constant vorticity flows: from laminar flows to touching waves

   Master-uppsats, Lunds universitet/Matematik (naturvetenskapliga fakulteten); Lunds universitet/Matematikcentrum

   Författare :Francisco Gonçalves Jorge Dias de Carvalho; [2023]
   Nyckelord :Partial differential equations; Water waves; Euler equations; Free boundary problem; Bifurcation theory; Nonlinear functional analysis; Hilbert transform; Mathematics and Statistics;

   Sammanfattning : In a recent paper, Hur and Wheeler proved the existence of periodic steady water waves over an infinitely deep, two-dimensional and constant vorticity flow and subject to gravity whose profile overhangs, among which, waves whose surface touches at a point, enclosing a bubble of air. We take this further, proving the existence of a continuous curve of water waves from a laminar flow up to a touching wave for fixed non-zero gravity. LÄS MER

5. 4. Value of decision control mechanisms in avoiding free cash flow drawbacks in the first place

   Magister-uppsats, Lunds universitet/Företagsekonomiska institutionen

   Författare :Cattleya Pamela Oktaviano; Anna Priscilla Namono; [2023]
   Nyckelord :Free Cash Flow FCF ; Internal Control; Levers of Control LOC ; Pre-decision Control; Mid-level Managers; Business and Economics;

   Sammanfattning : This thesis examines the utilization of internal controls as means of facilitating effective use of free cash flow (FCF) by managers, with the aim of preventing potential issues that may distort their relationship with shareholders. The objective was to understand the means of mitigating FCF issues by identifying internal controls within the companies to guarantee the effective utilization of cash available while aligning decision making with companies’ strategy and performance. LÄS MER

7. 5. Influence of hydrogen and carbides on high temperature cracking in cast Inconel

   Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Tillämpad mekanik

   Författare :Gunnar Dufwa; [2022]
   Nyckelord :Hydrogen embrittlement; carbide; finite element method; dislocation dynamics;

   Sammanfattning : Hydrogen embrittlement is a well-known source of cracking in metallic mechanical elements. This work studies the influence of hydrogen and carbides on the crack formation in a castnickel-alloy-component in a selective catalytic reduction system. LÄS MER