Permeability variations by changes in geometrical conditions

Optimization of Polymer Electrolyte Membrane Fuel Cell Performance by Geometrical Changes

Three-dimensional computational fluid dynamics in house-code of a Polymer Electrolyte Membrane Fuel Cell (PEMFC) has been developed. The conservation equations are numerically solved using finite volume technique. One of the important goals of this research is the investigation of the variation of bipolar plates width effect on the fuel cell performance compared with the conventional m...

Changes in permeability caused by dynamic stresses in fractured sandstone

[1] Shaking-induced changes in permeability have been invoked to explain a wide range of hydrologic responses to earthquakes. We measure the evolution of permeability in fractured sandstone in response to repeated shaking under undrained conditions. The frequency and amplitude of the imposed shaking are similar to those from earthquakes at distances of a fault length from the ruptured fault. To...

Learning by geometrical shape changes of dendritic spines

The role of dendritic spines in neuronal information processing is still not completely clear. However, it is known that spines can change shape rapidly during development and during learning and these morphological changes might be relevant for information storage (memory formation). We demonstrate the impact of shape variations on electrical signal propagation via dendritic spines using a bio...

Apparent photosynthesis of soybean plants as affected by changes in leaf water potential under field conditions

Geometrical Conditions Indispensable for Muscle Contraction

Computer simulation has uncovered the geometrical conditions under which the vertebrate striated muscle sarcomere can contract. First, all thick filaments should have identical structure, namely: three myosin cross-bridges, building a crown, should be aligned at angles of 0°, 120°, 180°, and the successive crowns and the two filament halves should be turned around 120°. Second, all thick filame...