Sökning: "principal"

Visar resultat 21 - 25 av 1197 avhandlingar innehållade ordet principal.

  1. 21. Mesoporous transition metal oxides for oxygen electrocatalysis in energy conversion technologies

    Författare :Zhixing Wu; Emma Björk; Magnus Odén; Mikhail Vagin; Freddy Kleitz; Linköpings universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : Electrocatalysis, the foundation of electrical to chemical energy transformation, enables the mitigation of the electrical energy losses during reactions and the control of selectivity of the process to certain chemical products. The slow rate and the multi-step complexity of oxygen-associated reactions, namely oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), motivate the use of platinum group metals (PGM) catalysts, which significantly increase the price of the technologies due to the cost and scarcity of PGM-based materials. LÄS MER

  3. 22. Ultracold atoms in optical potentials : from noise-induced transport to superfluidity

    Författare :Martin Zelan; Claude Dion; Sile Nic Chormaic; Umeå universitet; []
    Nyckelord :Brownian motors; noise-induced transport; superfluidity; ultracold atoms; optical potentials; optical lattices; laser coooling; fysik; Physics;

    Sammanfattning : In this thesis, both experimental studies and numerical simulations of ultracold atoms in optical potentials are presented in a collection of nine scientific papers. In particular, noise-induced transport in dissipative optical lattices and superfluid properties of Bose-Einstein condensates have been studied. LÄS MER

  4. 23. Very Low Bitrate Video Communication : A Principal Component Analysis Approach

    Författare :Ulrik Söderström; Haibo Li; Luis Torres; Umeå universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Video compression; Very low bitrate; Principal component analysis; Complexity; Semantically important areas; Wearable video; Other electrical engineering; electronics and photonics; Övrig elektroteknik; elektronik och fotonik;

    Sammanfattning : A large amount of the information in conversations come from non-verbal cues such as facial expressions and body gesture. These cues are lost when we don't communicate face-to-face. But face-to-face communication doesn't have to happen in person. With video communication we can at least deliver information about the facial mimic and some gestures. LÄS MER

  5. 24. Rektorns beslutsfattande om skolans organisation : Navigering utifrån beslutslogiker i oländig terräng

    Författare :Tina Bröms; Elisabet Nihlfors; Anders Arnqvist; Daniel Nordholm; Ulf Leo; Uppsala universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Principal; Decision-Making; Governance of schools; Principals Decision-Making; Decision theory; Educational Leadership; Rektor; Beslutfattande; Styrning av skolan; Rektorns beslutfattande; Beslutsteori; Skolledarskap; ; Pedagogik; Education;

    Sammanfattning : Over the past several years, there has been a greater demand for accountability of principal´s for the education they provide. Through the Education Act (SFS 2010:800), the Swedish parliament has increased the regulation and clarification of the principal´s responsibility in several areas, for example the responsibility to decide on the school’s internal organization. LÄS MER

  7. 25. Aspects of common principal components

    Författare :Toni Duras; Thomas Holgersson; Jönköping University; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : The focus of this thesis is the common principal component (CPC) model, the generalization of principal components to several populations. Common principal components refer to a group of multidimensional datasets such that their inner products share the same eigenvectors and are therefore simultaneously diagonalized by a common decorrelator matrix. LÄS MER