38,741 research outputs found
Equilibrium Clusters in Concentrated Lysozyme Protein Solutions
We have studied the structure of salt-free lysozyme at 293 K and pH 7.8 using
molecular simulations and experimental SAXS effective potentials between
proteins at three volume fractions, 0.012, 0.033, and 0.12. We found that the
structure of lysozyme near physiological conditions strongly depends on the
volume fraction of proteins. The studied lysozyme solutions are dominated by
monomers only for <0.012; for the strong dilution 70% of proteins are in a form
of monomers. For 0.033 only 20% of proteins do not belong to a cluster. The
clusters are mainly elongated. For 0.12 almost no individual particles exits,
and branched, irregular clusters of large extent appear. Our simulation study
provides new insight into the formation of equilibrium clusters in charged
protein solutions near physiological conditions
The inertial dynamics of thin film flow of non-Newtonian fluids
Consider the flow of a thin layer of non-Newtonian fluid over a solid
surface. I model the case of a viscosity that depends nonlinearly on the
shear-rate; power law fluids are an important example, but the analysis here is
for general nonlinear dependence. The modelling allows for large changes in
film thickness provided the changes occur over a large enough lateral length
scale. Modifying the surface boundary condition for tangential stress forms an
accessible base for the analysis where flow with constant shear is a neutral
critical mode, in addition to a mode representing conservation of fluid.
Perturbatively removing the modification then constructs a model for the
coupled dynamics of the fluid depth and the lateral momentum. For example, the
results model the dynamics of gravity currents of non-Newtonian fluids even
when the flow is not very slow
Towards a kansei-based user modeling methodology for eco-design
We propose here to highlight the benefits of building a framework linking Kansei Design (KD), User Centered Design (UCD) and Eco-design, as the correlation between these fields is barely explored in research at the current time. Therefore, we believe Kansei Design could serve the goal of achieving more sustainable products by setting up an accurate understanding of the user in terms of ecological awareness, and consequently enhancing performance in the Eco-design process. In the same way, we will consider the means-end chain approach inspired from marketing research, as it is useful for identifying ecological values, mapping associated functions and defining suitable design solutions. Information gathered will serve as entry data for conducting scenario-based design, and supporting the development of an Eco-friendly User Centered Design methodology (EcoUCD).ANR-ECOUS
- âŠ