| 1. |
- Caldenby, Claes, 1946
(author)
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Nya Pedagogen
- 2007
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In: Arkitektur.
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Journal article (other academic/artistic)
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| 2. |
- Höök, Matilda, et al.
(author)
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The development of a portfolio of business models: a longitudinal case study of a building material company
- 2015
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In: Construction Management and Economics. - : Informa UK Limited. - 0144-6193 .- 1466-433X. ; 33:5-6, s. 334-348
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Journal article (peer-reviewed)abstract
- Dynamic aspects of intended company change can be related to the development and management of a portfolio of business models with regard to competence deployment and to performance. A portfolio of business models is seen as a reflection of the realized strategy of a company, and the dynamics aspects of company change are connected to internal and external critical strategic incidents. The business model elements considered in this research are market position, offering, and operational platform enabling a differentiation between strategic and operational effectiveness. The evolution of a Swedish supplier of building components and systems during a 15-year period is examined. The process data consists of temporal phases where a shift of phase is defined as a change of a specific portfolio of business models. The concept of a portfolio of business models helped to discover new and conflicting standardized or customized business models that were not always intended by the company. The findings indicate that unawareness of intended actions led to unintended allocation of resources or integration mechanisms that negatively affected company performance. On the other hand gains can be achieved if a strategy is deliberately managed as a portfolio of business models which then also can be a tool for managing change in a company
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| 3. |
- Johansson, Pär, 1986, et al.
(author)
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Interior Insulation Retrofit of a Brick Wall Using Vacuum Insulation Panels: Re-Creation of Cultural Historical Values in Buildings from before 1945
- 2016
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In: Proceeding of the International RILEM Conference Materials, Systems and Structures in Civil Engineering 2016: Segment on Historical Masonry, August 22-24, 2016, Lyngby, Denmark.
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Conference paper (other academic/artistic)abstract
- The Swedish housing stock is once again in focus for national energy savings, as it was after the oil crises in the 1970s. The need for renovation is equally urgent in older stocks of housing, also in those that already have been renovated but are in need of further interventions. The first part of this project concerns inventorying of building components in buildings from before 1945 in need of a second major renovation. The focus of the inventorying is energy performance, moisture resistance, long-term durability and thermal comfort. The results from the inventories will be used to investigate alternative and improved solutions for re-renovation to recreate e.g. architectural details and cultural historical values. The possible thickness of the insulation layer is limited by the existing construction. Vacuum insulation panels (VIPs) require less thickness than conventional insulation materials to reach the same thermal resistance. Therefore, it could be more appropriate to use VIPs than conventional insulation materials when retrofitting the building envelope of listed buildings. In a previous study, a brick wall with wooden beams was insulated on the interior with vacuum insulation panels (VIPs) in a laboratory. It was shown that adding interior VIPs can reduce the energy use substantially in brick buildings. Adding interior insulation decreases the temperature during the cold season, which results in higher relative humidity. In the wooden beams, the moisture content increased more in the end of the beam than close to the interior surface of the brick. There was no significant difference between the RH in the wooden beam ends in the case with and without VIPs.
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| 7. |
- Linse, Per, et al.
(author)
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A New Two-State Polymer Folding Model and Its Application to alpha-Helical Polyalanine
- 2011
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In: The Journal of Physical Chemistry Part B. - : American Chemical Society (ACS). - 1520-5207 .- 1520-6106. ; 115:39, s. 11448-11454
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Journal article (peer-reviewed)abstract
- A new two-state polymer folding model is proposed, in which the folding of a stiff helical polymer is enabled by allowing for short sequences of coils connecting shorter and separated helices. The folding is driven by short-range attraction energy among stacked helices and is opposed by the free-energy cost of forming coils from helical monomers. Principal outcomes of the model are equilibrium distribution of the number of helices and their length in helical polymers. The proposed model is applied to a-helical polyalanine. The distribution of the number of alpha-helices as a function of number of alanine residues is fitted to the corresponding result from molecular dynamics simulation employing an all-atom potential model with very good agreement. The influence and significance of the fitting parameters and possible use of the two-state folding model are discussed.
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| 8. |
- Linse, Per, et al.
(author)
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Adsorption versus aggregation. Particles and surface of the same material
- 2012
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In: Soft Matter. - : Royal Society of Chemistry (RSC). - 1744-6848 .- 1744-683X. ; 8:8, s. 2486-2493
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Journal article (peer-reviewed)abstract
- A model for the adsorption of colloidal particles on a planar surface is analyzed by using a thermodynamic chemical equilibrium model and Monte Carlo simulations. Central to this investigation are that (i) particles and surface are considered to be of the same material and (ii) the particle-surface and particle-particle interactions are related using the Derjaguin approximation using a surface-surface square-well potential as a basis. Thereby, all interactions within the system are characterized by the same parameters, and hence the difference between particle adsorption on the surface and particle aggregation in bulk is solely due to geometrical effects. Equilibrium constants for the different binary associations are calculated from the interaction potentials enabling a direct comparison between predictions based on a chemical equilibrium model and on computer simulations with no adjustable parameters. As the interaction gradually is made more attractive for a given particle concentration, we find the following sequence of events: (A) a weak particle adsorption onto the surface, (B) particle association on the surface forming a denser single adsorbed layer, (C) formation of a second adsorbed layer on the surface, (D) multiple adsorbed layers on the surface, and (E) bulk phase separation. There is a semi-quantitative agreement between the predictions of the equilibrium model and the results of the simulations. The equilibrium model calculations facilitate a conceptual understanding of the competition between association on a surface and in bulk. Our study is relevant both for understanding processes where colloidal particle adsorption is used to modify surface properties and also for the understanding of heterogeneous versus homogeneous nucleation.
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| 9. |
- Linse, Per, et al.
(author)
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Dipolar Order in Molecular Fluids: II. Molecular Influence
- 2011
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In: Journal of Statistical Physics. - : Springer Science and Business Media LLC. - 1572-9613 .- 0022-4715. ; 145:2, s. 418-440
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Journal article (peer-reviewed)abstract
- The influence on the short-range packing in dipolar fluids by molecular shape and by additional higher order electrostatic moments has been investigated by molecular dynamic simulations. The dipole polarization was found to decrease as the particles were elongated parallel to the dipole and to increase for elongation perpendicular to the dipole, eventually forming a nematic order. The addition of a quadrupole lead to a reduction of the polarization, and the influence of an axial octupole was weaker and more complex. Both a decrease and an increase of the polarization is possible depending on the relative dipole-dipole and octupole-octupole interaction strengths and the relative direction of the symmetry axes of the moments. These observations were attributed to the different parity of a dipole and a quadrupole and the same parity of a dipole and an axial octupole under reflection. In addition, further insights into the formation of dipole polarization were obtained. Short polar and long equatorial radii and strong dipole-dipole interaction are particle properties that promote a fluid with a high dipole polarization.
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| 10. |
- Linse, Per
(author)
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Effect of solvent quality on the polymer adsorption from bulk solution onto planar surfaces
- 2012
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In: Soft Matter. - : Royal Society of Chemistry (RSC). - 1744-6848 .- 1744-683X. ; 8:19, s. 5140-5150
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Journal article (peer-reviewed)abstract
- Adsorption of uncharged homopolymers in good and theta solvents onto planar surfaces at various chain flexibility and polymer-surface attraction strengths was investigated by using a coarse-grained bead-spring polymer model and simulation techniques. Equilibrium properties of the interfacial systems were obtained from Monte Carlo simulations by monitoring the bead and polymer density profiles, the number of adsorbed beads and polymers, the components of the radius of gyration perpendicular and parallel to the surface as well as tail, loop, and train characteristics. The adsorption process starting with a polymer-free zone adjacent to the surface was examined by Brownian dynamic simulations. At equilibrium, the adsorbed amount increased upon increasing chain stiffness and in poorer solvent conditions, and the structural characteristics depended also on the chain stiffness and solvent condition. The initial adsorption was diffusion controlled, but soon it became governed by the probability of a polymer to be captured by the surface attraction. Flexible polymers became flattened after attaching, but their final relaxation mechanism involved an increase in perpendicular extension. There were fewer adsorbed beads and longer tails, which was driven by the surface pressure originating from the surrounding adsorbed polymers. This structural rearrangement became more prominent in poorer solvent conditions. Finally, the integration time, which denotes the adsorption time for adsorbed polymers to become fully integrated into the adsorbed layer, and the residence times of integrated polymers were analyzed. In particular, the latter became longer with increasing chain stiffness and shorter in poorer solvent conditions.
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