Sökning: "gradient structure"

Visar resultat 1 - 5 av 251 avhandlingar innehållade orden gradient structure.

  1. 1. Structure and dynamics of complex materials in the water-poor regime

    Författare :Sanna Gustavsson; Fysikalisk kemi; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Hydration; cellulose; dissolution; sugar surfactant; hydrated crystals; structure; dynamics; phase diagram; fuel cell; pulsed-field-gradient PFG spin-echo NMR; Polarization Transfer solid state NMR; PXRD; GVS; TGA; amphiphilic;

    Sammanfattning : In the solid state, molecules are normally ordered in a specific structure. With time, and as a result of influence from the surroundings, solid materials can change their molecular and/or crystal structure and, as a consequence, obtain completely different properties. Water is particularly important in this respect. LÄS MER

  3. 2. Epidemiology of cardiovascular disease risk factors in Ethiopia : the rural-ruban gradient

    Författare :Fikru Tesfaye; Rainer Sauerborn; Umeå universitet; []
    Nyckelord :Epidemiology; epidemiologi;

    Sammanfattning : BackgroundChanges in the population structure and the main causes of death result in the growing burden of chronic diseases, which characterize the epidemiological transition. The transition takes place at different paces in different parts of the world. LÄS MER

  4. 3. Structure of Zero Pressure Gradient High Reynolds Number Turbulent Boundary Layers

    Författare :Murat Tutkun; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Fourier decomposition.; proper orthogonal decomposition; large scale structures; Turbulent boundary layers; zero pressure gradient; wind tunnel; calibration; cross-correlations; hot-wire; two-point correlations; high Reynolds number;

    Sammanfattning : This thesis presents part of the large research program funded by the European Commission calledWallturb: A European synergy for the assessment of wall turbulence. The main aim of this researchprogram is to create new experimental and numerical databases on the characteristics of turbulent wall-bounded flows, especially turbulent boundary layers. LÄS MER

  5. 4. Structure Analysis of a Transient Protein Complex - NMR, X-ray crystallographic and Mass Spectrometric Studies of the Soluble Domains of the Proton-Pump Transhydrogenase from E. coli

    Författare :Tomas Johansson; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; nuclear magnetic resonance; proton-translocating transhydrogenase; structure; interactions; x-ray crystallography;

    Sammanfattning : Interactions between macromolecules in the cell are fundamental to life. However, many interactions are of a transient nature and are as such difficult to study at the atomic level using existing techniques. LÄS MER

  7. 5. Computational modeling of polycrystals using gradient crystal plasticity

    Författare :Mikkel Grymer; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; parallel algorithms; crystal plasticity; dual mixed finite element method; gradient hardening; grain modeling;

    Sammanfattning : This thesis treats the modeling of grain size dependence inmicrostructure models of metals. It is shown how gradient hardening, in a thermodynamically consistent fashion, can be included into a crystal plasticity model, which is used as the constitutive model in each grain of the polycrystal. LÄS MER