4,536 research outputs found
Topology and shape optimization of induced-charge electro-osmotic micropumps
For a dielectric solid surrounded by an electrolyte and positioned inside an
externally biased parallel-plate capacitor, we study numerically how the
resulting induced-charge electro-osmotic (ICEO) flow depends on the topology
and shape of the dielectric solid. In particular, we extend existing
conventional electrokinetic models with an artificial design field to describe
the transition from the liquid electrolyte to the solid dielectric. Using this
design field, we have succeeded in applying the method of topology optimization
to find system geometries with non-trivial topologies that maximize the net
induced electro-osmotic flow rate through the electrolytic capacitor in the
direction parallel to the capacitor plates. Once found, the performance of the
topology optimized geometries has been validated by transferring them to
conventional electrokinetic models not relying on the artificial design field.
Our results show the importance of the topology and shape of the dielectric
solid in ICEO systems and point to new designs of ICEO micropumps with
significantly improved performance.Comment: 18 pages, latex IOP-style, 7 eps figure
IMPROVING PROJECT MANAGEMENT FOR SUSTAINABLE DEVELOPMENT
Institutional and Behavioral Economics,
AGROFORESTRY POLICIES CONTRIBUTE TO SUSTAINABLE LAND USE
Resource /Energy Economics and Policy,
On the probability of occurrence of rogue waves
A number of extreme and rogue wave studies have been conducted theoretically, numerically, experimentally and based on field data in the last years, which have significantly advanced our knowledge of ocean waves. So far, however, consensus on the probability of occurrence of rogue waves has not been achieved. The present investigation is addressing this topic from the perspective of design needs. Probability of occurrence of extreme and rogue wave crests in deep water is here discussed based on higher order time simulations, experiments and hindcast data. Focus is given to occurrence of rogue waves in high sea states
Breathing New Life into Interstitial Lung Disease in Rheumatoid Arthritis
Clinical heterogeneity is a hallmark of many autoimmune disorders, and clinical or subclinical pulmonary involvement is a common extraarticular feature of the rheumatoid arthritis (RA) phenotype. High-resolution computed tomography reveals evidence of pulmonary abnormalities in more than half of patients with RA, and clinically significant interstitial lung disease (ILD) will develop in approximately 10% of patients.It is currently difficult to identify these patients and to intervene early in the clinical course of their lung disease
Topology and shape optimization of induced-charge electro-osmotic micropumps
For a dielectric solid surrounded by an electrolyte and positioned inside an externally biased parallel-plate capacitor, we study numerically how the resulting induced-charge electro-osmotic (ICEO) flow depends on the topology and shape of the dielectric solid. In particular, we extend existing conventional electrokinetic models with an artificial design field to describe the transition from the liquid electrolyte to the solid dielectric. Using this design field, we have succeeded in applying the method of topology optimization to find system geometries with non-trivial topologies that maximize the net induced electro-osmotic flow rate through the electrolytic capacitor in the direction parallel to the capacitor plates. Once found, the performance of the topology-optimized geometries has been validated by transferring them to conventional electrokinetic models not relying on the artificial design field. Our results show the importance of the topology and shape of the dielectric solid in ICEO systems and point to new designs of ICEO micropumps with significantly improved performance
Highly efficient photonic nanowire single-photon sources for quantum information applications
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