Essays about: "numerisk"

Showing result 1 - 5 of 366 essays containing the word numerisk.

  1. 1. Gravitational Collapse of a Massless Scalar Field in a Theory of Minimally Modified Gravity

    University essay from KTH/Fysik

    Author : Atabak Fathe Jalali; [2024]
    Keywords : Theoretical physics; astrophysics; modified gravity; minimally modified gravity; gravitational collapse; VCDM; scalar collapse; apparent horizon; numerical relativity; Teoretisk fysik; astrofysik; modifierad gravitation; minimalt modifierad gravitation; gravitationskollaps; VCDM; skalär kollaps; uppenbar horisont; numerisk relativitet;

    Abstract : This thesis explores the spherically symmetric gravitational collapse of a massless scalar field in a minimally modified gravity theory denoted VCDM (V replaces $\Lambda$ in the $\Lambda$CDM abbreviation), a class of theories propagating the same degrees of freedom as general relativity at the expense of broken 4D diffeomorphism invariance. Numerical evolution of the equations of motion reveals that for small initial scalar profile amplitudes, no black hole forms from the collapse. READ MORE

  3. 2. Analysis of a shape morphing structural battery: manufacturing, analytical modeling and numerical simulation

    University essay from KTH/Lättkonstruktioner, marina system, flyg- och rymdteknik, rörelsemekanik

    Author : Alfredo Bici; [2023]
    Keywords : ;

    Abstract : A reduction in the global use of fossil fuels is necessary when striving for a more sustainable future. One key strategy in the transition from fossil fuels is electrification. This strategy is particularly prominent within the transport sector, where more efficient ways to store electric energy are being pursued. READ MORE

  4. 3. Samband mellan fysisk aktivitet och sömn hos hundägare samt nattvila hos hund : effekter av ett gemensamt träningsprogram

    University essay from SLU/Dept. of Clinical Sciences; SLU/Dept. of Anatomy, Physiology and Biochemistry

    Author : Moa Blomstedt; Emma Flyman; [2023]
    Keywords : aktivitetsmätare; fysisk aktivitet; hund; hundägare; samsovning; sömn; träningsprogram; vila;

    Abstract : Fysisk aktivitet är viktigt för att hund och hundägare ska må bra. Flera studier gjorda på människa och hund visar att en god fysisk aktivitet ger flera hälsofördelar. Inom humanstudier påvisas även att fysisk aktivitet ger en bättre sömn som även är en viktig del för måendet. READ MORE

  5. 4. Randomized Diagonal Estimation

    University essay from KTH/Matematik (Avd.)

    Author : Niclas Joshua Popp; [2023]
    Keywords : Diagonal estimation; randomized numerical linear algebra; low-rank approximation; matrix functions; Diagonalestimering; randomiserad numerisk linjär algebra; lågrankad approximation; matrisfunktioner;

    Abstract : Implicit diagonal estimation is a long-standing problem that is concerned with approximating the diagonal of a matrix that can only be accessed through matrix-vector products. It is of interest in various fields of application, such as network science, material science and machine learning. READ MORE

  6. 5. Predictive Controllers for Load Transportation in Microgravity Environments

    University essay from KTH/Skolan för elektroteknik och datavetenskap (EECS)

    Author : Sujet Phodapol; [2023]
    Keywords : Model Predictive Control; Decentralized control; Multi-robot systems; Space technology; Modell-prediktiv reglering; Decentraliserad reglering; Multirobotsystem; Rymdteknologi;

    Abstract : Space activities have been increasing dramatically in the past decades. As a result, the number of space debris has also increased significantly. Therefore, it is necessary to clean up and remove them to prevent a collision between space debris and spacecraft. READ MORE