Sökning: "bred väg"

Visar resultat 1 - 5 av 7 avhandlingar innehållade orden bred väg.

  1. 1. Miljögeotekniskt bedömningssystem : applikation på väg- och järnvägsbyggnadsmaterial

    Författare :Bo Svedberg; Luleå tekniska universitet; []

    Sammanfattning : Material som används vid väg- och järnvägsbyggnad påverkar och samverkar med den omgivande mark- och vattenmiljön. Att klarlägga och värdera denna påverkan såväl kvantitativt som kvalitativt är av central betydelse för att på ett säkert och bra sätt kunna nyttja traditionella material såväl som till exempel industriella restprodukter. LÄS MER

  2. 2. Modeling and optimization of least-cost corridors

    Författare :Lindsi Seegmiller; Takeshi Shirabe; Kai-Florian Richter; KTH; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; raster data modeling; raster-based geographic information systems; route planning; optimal routing; corridor; wide path; corridor width; distortion; three-dimensional grid; rasterdatamodellering; rasterbaserade geografiska informationssystem; ruttplanering; optimal dirigering; korridor; bred väg; korridorbredd; distorsion; tredimensionellt rutnät; Geoinformatik; Geoinformatics;

    Sammanfattning : Given a grid of cells, each having a value indicating its cost per unit area, a variant of the least-cost path problem is to find a corridor of a specified width connecting two termini such that its cost-weighted area is minimized. A computationally efficient method exists for finding such corridors, but as is the case with conventional raster-based least-cost paths, their incremental orientations are limited to a fixed number of (typically eight orthogonal and diagonal) directions, and therefore, regardless of the grid resolution, they tend to deviate from those conceivable on the Euclidean plane. LÄS MER

  3. 3. Transition-Metal Catalyzed Synthesis of Small- and Medium-Sized Rings Applications toward oxazole synthesis, cycloheptadienes, and natural products

    Författare :Henrik von Wachenfeldt; Centrum för analys och syntes; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; catalysis; transition metal; cyclization; cycloaddition; natural product;

    Sammanfattning : This thesis deals with the development of novel methodologies for the synthesis of hetero- and carbocycles enabled by transition metal catalysis. The second chapter of the thesis describes a gold-catalyzed three-component reaction to form a variety of substituted oxazoles from readily available N-benzylimines, terminal alkynes, and acyl chlorides. LÄS MER

  4. 4. Ab initio Investigation of Face-centered cubic High-Entropy Alloys

    Författare :Xun Sun; Levente Vitos; Torbjörn Björkman; KTH; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; ab initio; high-entropy alloys; twinning; martensitic transformation; elastic properties; phase stability; Materials Science and Engineering; Teknisk materialvetenskap;

    Sammanfattning : High-entropy alloys (HEAs) represent a special group of solid solutions containing five or more principal elements. The new design strategy has attracted extensive attention from the materials science community. The design and development of HEAs with desired properties have become an important subject in materials science and technology. LÄS MER

  5. 5. Towards an All-Embracing Elliptic Solver in 2D

    Författare :Rikard Ojala; Matematik LTH; []

    Sammanfattning : This thesis addresses solving elliptic partial differential equation using integral equation methods, with emphasis on accuracy, speed and stability. Of particular interest are such equations on non-smooth domains, and several different elliptic problems such as electrostatic and elastostatic ones are treated and solved in this setting... LÄS MER