Publications by authors named "Hans Lind"

5 Publications

  • Page 1 of 1

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

J Phys Condens Matter 2021 May 21;33(25). Epub 2021 May 21.

Thin Films Physics, Department of Physics, Chemistry, and Biology, Linköping University, SE-581-83 Linköping, Sweden.

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. We find all considered-MAB phases to be metallic with a significant peak in the electronic structure at the Fermi level and no significant anisotropy in the electronic band structure. The simulations also indicate that they are rather hard and stiff, in particular the Cr-based ones, with a Young's modulusof 325 GPa for″ = Sc. The Mo-based phases are similar, with= 299 GPa for″ = Sc, which is higher than the corresponding laminated carbides (-MAX phases).
View Article and Find Full Text PDF

Download full-text PDF

Source
http://dx.doi.org/10.1088/1361-648X/abf9bcDOI Listing
May 2021

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

Adv Mater 2019 Jan 4;31(2):e1805472. Epub 2018 Nov 4.

Thin Film Physics Division, Department of Physics, Chemistry and Biology (IFM), Linköping University, SE-581 83, Linköping, Sweden.

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. The effective adsorption of CO gas (≈12 mol kg ) on individual sheets of 2D transition metal carbides (referred to as MXenes) is reported here. It is shown that exposure to N gas results in no adsorption, consistent with first-principles calculations. The adsorption efficiency combined with the CO /N selectivity, together with a chemical and thermal stability, identifies the archetype Ti C MXene as a new material for carbon capture (CC) applications.
View Article and Find Full Text PDF

Download full-text PDF

Source
http://dx.doi.org/10.1002/adma.201805472DOI Listing
January 2019

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

Accid Anal Prev 2014 Nov 15;72:391-400. Epub 2014 Aug 15.

NTNU Samfunnsforskning, Studio Apertura, Dragvoll Allé 38 B, 7491 Trondheim, Norway; Norwegian University of Science and Technology, Department of Psychology, Dragvoll, 7491 Trondheim, Norway.

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). The results showed that those who prioritized efficiency and flexibility tended to commute by car, while those who prioritized safety and comfort used public (e.g. metro, tram, and train) or active (e.g. walking and cycling) transport. In a free choice scenario, the respondents who prioritized flexibility reported a preference for using a car, whereas those who prioritized safety and comfort preferred public and active transport for their commuter travels. Risk perception of high impact events, such as terrorism and major accidents, as well as risk perception related to personal impact risks (theft, violence etc.) were related to car use on commuter travels. Transport-related worry exerted weak influences on mode use and preferences. Increased speed on rail transport and more frequent departures may be effective in reducing car use on commuter travels. Risk communication should focus on highlighting the low risk of experiencing security and safety issues in the public transport sector, and this message should be complemented by efforts to reduce the probability of negative events affecting public transport.
View Article and Find Full Text PDF

Download full-text PDF

Source
http://dx.doi.org/10.1016/j.aap.2014.07.028DOI Listing
November 2014

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

ScientificWorldJournal 2013 22;2013:709423. Epub 2013 Oct 22.

Real Estate and Construction Management, School of Architecture and Built Environment (ABE), Royal Institute of Technology, KTH, Brinellvägen 1, 100 44 Stockholm, Sweden.

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. It is argued that choice of procurement type will not be a crucial factor. There is no procurement method that guarantees a better quality than another. We argue that given the right conditions all procurement methods can give good results, and given the wrong conditions, all of them can lead to low quality. What is crucial is how the client organization manages knowledge and the incentives for the members of the organization. This can be summarized as "organizational culture." One way to improve knowledge and create incentives is to use independent second opinions in a systematic way.
View Article and Find Full Text PDF

Download full-text PDF

Source
http://dx.doi.org/10.1155/2013/709423DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3819949PMC
June 2014

Phase Stability and Elasticity of TiAlN.

Materials (Basel) 2011 Sep 15;4(9):1599-1618. Epub 2011 Sep 15.

Department of Physics, Chemistry, and Biology (IFM), Linköping University, Linköping 58183, Sweden.

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. The strong dependence of the elastic properties and sound wave anisotropy on the Al-content offers detailed understanding of the spinodal decomposition and age hardening in TiAlN alloy films and multilayers. TiAlN/TiN multilayers can further improve the hardness and thermal stability compared to TiAlN since they offer means to influence the kinetics of the favorable spinodal decomposition and suppress the detrimental transformation to w-AlN. Here, we show that a 100 degree improvement in terms of w-AlN suppression can be achieved, which is of importance when the coating is used as a protective coating on metal cutting inserts.
View Article and Find Full Text PDF

Download full-text PDF

Source
http://dx.doi.org/10.3390/ma4091599DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5448856PMC
September 2011
-->