Sökning: "adiabatic"

Visar resultat 21 - 25 av 68 uppsatser innehållade ordet adiabatic.

  1. 21. Effekt av fasändringsmaterial på hydratiseringprocessen hos Portlandcement: En experimentell studie

    Kandidat-uppsats, KTH/Byggteknik och design

    Författare :Lubna Al-Khaffaf; Hala Khalil; [2020]
    Nyckelord :Phase change material PCM ; established environmental requirements; hydration properties; heat flow; cement hydration; set time; energy consumption; slump flow; density; compressive strength.; Fasändringsmaterial PCM ; etablerade miljökraven; hydratiseringsegenskaperna; värmeflöde; cementhydratisering; inställningstid; energiförbrukning; slumflöde; densitet; tryckhållfasthet;

    Sammanfattning : The Phase change materials (PCM) have the ability to absorb and release heat as the temperature changes from high to low temperature and vice versa. The use of phase change materials has increased in the construction sector due to the established environmental requirements and the various application benefits, especially in the thermal comfort of building applications and construction of sustainable infrastructure around the world (Berardi and Gallardo, 2019). LÄS MER

  3. 22. Fundamental combustion properties of alternative fuels for energy transition

    Master-uppsats, Lunds universitet/Fysiska institutionen; Lunds universitet/Förbränningsfysik

    Författare :Yijing Mao; [2020]
    Nyckelord :Physics and Astronomy;

    Sammanfattning : Validation and improvement of chemical kinetic modelling require accurate experimental data. The over goal of the present work is to obtain accurate data by using techniques that have been previously implemented in common flames, e.g. LÄS MER

  4. 23. Towards the Formation of the Antihydrogen Molecular Ion

    Magister-uppsats, Stockholms universitet/Fysikum

    Författare :Thomas Nerdi; [2020]
    Nyckelord :Antihydrogen; Resonance Scattering; Non-Hermitian Quantum Mechanics;

    Sammanfattning : The ALPHA experiment at CERN is an ongoing project which tests fundamental symmetries between matter and antimatter by producing and trapping antihydrogen atoms in order to perform precision spectroscopic measurements. A logical next step is to form the antihydrogen molecular ion (consisting of one positron and two antiprotons). LÄS MER

  5. 24. Ensemble Green's Function Theory for Interacting Electrons with Degenerate Ground States

    Master-uppsats, Lunds universitet/Matematisk fysik; Lunds universitet/Fysiska institutionen

    Författare :Erik Linnér; [2019]
    Nyckelord :Green s function; Degeneracy; Density matrix; Ensemble; GW; Zero-temperature; Finite-temperature; Hubbard model; Two-dimensional harmonic oscillator; Ising model; Hydrogen-like model; Physics and Astronomy;

    Sammanfattning : An ensemble Green's function theory for many-electron systems with degenerate ground states, based on the von Neumann density matrix formalism, is proposed. The formalism is constructed without an assumption of an adiabatic connection. An ensemble analogue of Hedin's equations and the GW Approximation (GWA) is constructed. LÄS MER

  7. 25. Best practice of extracting magnetocaloric properties in magnetic simulations

    Master-uppsats, Uppsala universitet/Materialteori

    Författare :Johan Bylin; [2019]
    Nyckelord :Magnetocaloric effect; Thermodynamics; Statistical mechanics; Monte Carlo simulations; Metropolis algorithm; Wang-Landau method; Isothermal change in entropy; Adiabatic change in temperature; Numerical methods; Effective spin models;

    Sammanfattning : In this thesis, a numerical study of simulating and computing the magnetocaloric properties of magnetic materials is presented. The main objective was to deduce the optimal procedure to obtain the isothermal change in entropy of magnetic systems, by evaluating two different formulas of entropy extraction, one relying on the magnetization of the material and the other on the magnet's heat capacity. LÄS MER