| 1. |
- Byass, Peter, et al.
(författare)
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Beyond 2015 : time to reposition Scandinavia in global health?
- 2013
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Ingår i: Global Health Action. - Järfälla, Sweden : CoAction Publishing. - 1654-9716 .- 1654-9880. ; 6
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Tidskriftsartikel (refereegranskat)abstract
- Global health currently finds itself in an exciting, almost bewildering, state of flux. A plethora of initiatives, statements, high-level meetings, and other activities are generating a continuous flow of new ideas, with the impetus at least partly driven by the advent of the 2015 target date set for the Millennium Development Goals that were adopted in 2000. Whatever shape the post-2015 global health landscape may eventually take, it is already clear that there will be new targets of some kind as the world tries to make further progress on some of the less tractable health issues.
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| 2. |
- Friberg, Peter, et al.
(författare)
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Public and global engagement with global health
- 2013
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Ingår i: The Lancet. - : Elsevier. - 0140-6736 .- 1474-547X. ; 381:9883, s. 2066-2066
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Tidskriftsartikel (refereegranskat)abstract
- Global health is widely regarded as being grounded in public and global engagement. But much of the process of global health is dominated by Northern institutions, expert groups, think-tanks, high-level meetings, and the like. Indeed, the exponential growth of global health in the past decade may soon turn into terminal decline unless truly global and broad-based ownership of the concept can be achieved.
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| 3. |
- Almqvist, Andreas, et al.
(författare)
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A new approach for studying cavitation in lubrication
- 2014
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Ingår i: Journal of tribology. - : ASME International. - 0742-4787 .- 1528-8897. ; 136:1
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Tidskriftsartikel (refereegranskat)abstract
- The underlying theory, in this paper, is based on clear physical arguments related to conservation of mass flow and considers both incompressible and compressible fluids. The result of the mathematical modeling is a system of equations with two unknowns, which are related to the hydrodynamic pressure and the degree of saturation of the fluid. Discretization of the system leads to a linear complementarity problem (LCP), which easily can be solved numerically with readily available standard methods and an implementation of a model problem in matlab code is made available for the reader of the paper. The model and the associated numerical solution method have significant advantages over today's most frequently used cavitation algorithms, which are based on Elrod-Adams pioneering work
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| 4. |
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| 5. |
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| 6. |
- Almqvist, Andreas, et al.
(författare)
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Homogenization of a Reynolds equation describing compressible flow
- 2012
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Ingår i: Journal of Mathematical Analysis and Applications. - : Elsevier BV. - 0022-247X .- 1096-0813. ; 390:2, s. 456-471
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Tidskriftsartikel (refereegranskat)abstract
- We homogenize a Reynolds equation with rapidly oscillating film thickness function hε, assuming a constant compressiblity factor in the pressure-density relation. The oscillations are due to roughness on the bounding surfaces of the fluid film. As shown by previous studies, homogenization is an effective approach for analyzing the effects of surface roughness in hydrodynamic lubrication. By two-scale convergence theory we obtain the limit problem (homogenized equation) and strong convergence in L2 for the unknown density ρε. By adding a small corrector term we also obtain strong convergence in the Sobolev norm.
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| 7. |
- Almqvist, Andreas, et al.
(författare)
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Homogenization of the Reynolds equation
- 2013
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Ingår i: Encyclopedia of Tribology. - Berlin : Springer-Verlag New York Inc.. - 9780387928968 - 9780387928975 ; , s. 1685-1690
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Bokkapitel (refereegranskat)
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| 8. |
- Almqvist, Andreas, et al.
(författare)
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Multiscale homogenization of a class of nonlinear equations with applications in lubrication theory and applications
- 2011
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Ingår i: Journal of Function Spaces and Applications. - : Hindawi Limited. - 0972-6802 .- 1758-4965. ; 9:1, s. 17-40
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Tidskriftsartikel (refereegranskat)abstract
- We prove a homogenization result for monotone operators by using the method of multiscale convergence. More precisely, we study the asymptotic behavior as epsilon -> 0 of the solutions u(epsilon) of the nonlinear equation div a(epsilon)(x, del u(epsilon)) = div b(epsilon), where both a(epsilon) and b(epsilon) oscillate rapidly on several microscopic scales and a(epsilon) satisfies certain continuity, monotonicity and boundedness conditions. This kind of problem has applications in hydrodynamic thin film lubrication where the bounding surfaces have roughness on several length scales. The homogenization result is obtained by extending the multiscale convergence method to the setting of Sobolev spaces W-0(1,p)(Omega), where 1 < p < infinity. In particular we give new proofs of some fundamental theorems concerning this convergence that were first obtained by Allaire and Briane for the case p = 2.
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| 9. |
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| 10. |
- Almqvist, Andreas, et al.
(författare)
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Similarities and differences between the flow factor method by Patir and Cheng and homogenization
- 2011
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Ingår i: Journal of tribology. - : ASME International. - 0742-4787 .- 1528-8897. ; 133:3, s. 031702-1
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Tidskriftsartikel (refereegranskat)abstract
- Different averaging techniques have proved to be useful for analyzing the effects of surface roughness in hydrodynamic lubrication. This paper compares two of these averaging techniques, namely the flow factor method by Patir and Cheng (P&C) and homogenization. It has been rigorously proved by many authors that the homogenization method provides a correct solution for arbitrary roughness. In this work it is shown that the two methods coincide if and only if the roughness exhibits certain symmetries. Hence, homogenization is always the preferred method.
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