Investigation of out-of-plane ordered TiMoSiBfrom first principles.

The laminated ternary boride MoSiBof T2 structure have two symmetrically inequivalent metallic sites, 16l and 4c, being occupied in a 4:1 ratio. The phase was recently shown to be stable for 80% substitution of Mo for Ti, at the majority site, forming an out-of-plane chemically ordered quaternary boride: TiMoSiB. Considering that the hypothetical TiSiBis theoretically predicted as not stable, a key difference in bonding characteristics is indicated for full substitution of Mo for Ti at the metallic sites.

In-plane ordered quaternaryM4/3'M2/3″AlB2phases (-MAB): electronic structure and mechanical properties from first-principles calculations.

We have by means of first principles density functional theory calculations studied the mechanical and electronic properties of the so called-MAB phases,'″AlB, where' = Cr, Mo, W and″ = Sc, Y. These phases, experimentally verified for MoScAlBand MoYAlB, display an atomically laminated structure with in-plane chemical order between the' and″ elements. Structural properties, along with elastic constants and moduli, are predicted for different structural symmetries, including the reportedR3̄m(#166) space group.

2D Transition Metal Carbides (MXenes) for Carbon Capture.

Global warming caused by burning of fossil fuels is indisputably one of mankind's greatest challenges in the 21st century. To reduce the ever-increasing CO emissions released into the atmosphere, dry solid adsorbents with large surface-to-volume ratio such as carbonaceous materials, zeolites, and metal-organic frameworks have emerged as promising material candidates for capturing CO . However, challenges remain because of limited CO /N selectivity and long-term stability.

Transport priorities, risk perception and worry associated with mode use and preferences among Norwegian commuters.

There is currently scant research on the role of transport priorities, risk perception and worry for travel mode use and preferences. The present study aims to examine these factors in relation to mode use and preferences among Norwegian commuters. A web-based survey was conducted in a randomly obtained representative sample of daily commuters in the extended greater Oslo area (n=690).

How can clients improve the quality of transport infrastructure projects? The role of knowledge management and incentives.

The aim of this paper is to argue for a number of statements about what is important for a client to do in order to improve quality in new infrastructure projects, with a focus on procurement and organizational issues. The paper synthesizes theoretical and empirical results concerning organizational performance, especially the role of the client for the quality of a project. The theoretical framework used is contract theory and transaction cost theory, where assumptions about rationality and self-interest are made and where incentive problems, asymmetric information, and moral hazard are central concepts.

Phase Stability and Elasticity of TiAlN.

We review results of recent combined theoretical and experimental studies of TiAlN, an archetypical alloy system material for hard-coating applications. Theoretical simulations of lattice parameters, mixing enthalpies, and elastic properties are presented. Calculated phase diagrams at ambient pressure, as well as at pressure of 10 GPa, show a wide miscibility gap and broad region of compositions and temperatures where the spinodal decomposition takes place.