574 research outputs found
Forskningen i forandring â hvad med bibliotekerne?
Kan man ved at analysere udviklingen inden for forskning fastslĂĽ, hvordan fremtidens forskningsbibliotek skal indrettes? Hvilken rolle skal det i givet fald spille? Og hvad skal der til for at realisere denne rolle? Det er hovedspørgsmĂĽlene i en ny rapport bestilt af DEFF, Danmarks Elektroniske Fag- og Forskningsbibliotek. âThe Future of Research and the Research Libraryâ viser, at forskningssektoren er under forandring i disse ĂĽr. Og at der mĂĽ trĂŚffes vigtige strategiske valg pĂĽ forskningsbibliotekerne
Oligonucleotide directed mutagenesis of <i>Aspergilli </i>genomes using CRISPR-Cas9 technology
Resonance shifts and spill-out effects in self-consistent hydrodynamic nanoplasmonics
The standard hydrodynamic Drude model with hard-wall boundary conditions can
give accurate quantitative predictions for the optical response of noble-metal
nanoparticles. However, it is less accurate for other metallic nanosystems,
where surface effects due to electron density spill-out in free space cannot be
neglected. Here we address the fundamental question whether the description of
surface effects in plasmonics necessarily requires a fully quantum-mechanical
approach, such as time-dependent density-functional theory (TD-DFT), that goes
beyond an effective Drude-type model. We present a more general formulation of
the hydrodynamic model for the inhomogeneous electron gas, which additionally
includes gradients of the electron density in the energy functional. In doing
so, we arrive at a Self-Consistent Hydrodynamic Model (SC-HDM), where spill-out
emerges naturally. We find a redshift for the optical response of Na nanowires,
and a blueshift for Ag nanowires, which are both in quantitative agreement with
experiments and more advanced quantum methods. The SC-HDM gives accurate
results with modest computational effort, and can be applied to arbitrary
nanoplasmonic systems of much larger sizes than accessible with TD-DFT methods.
Moreover, while the latter typically neglect retardation effects due to
time-varying magnetic fields, our SC-HDM takes retardation fully into account.Comment: 27 pages, including 4 figures. Supplemental Material is available
upon request to author
Waiting time to surgery and pancreatic cancer survival:A nationwide population-based cohort study
Matching conditions in the quasicontinuum method: Removal of the error introduced at the interface between the coarse-grained and fully atomistic region
Reducing discards without reducing profit:Free gear choice in a Danish result-based management trial
The 2013 Common Fisheries Policy introduced a landing obligation on a range of species, bringing more focus on the full accountability of all catches. To investigate the potentials and challenges of these paradigm shifts, a 6-months âunrestricted gearâ trial was performed in Denmark in 2015. Twelve trawlers were challenged to test their own solutions to reduce unwanted bycatch and/or choke species, while maintaining profitable. The participating fishers tested different options depending on their fishery and the type of issues they faced individually, and adjusted their test fishery over time through incremental small steps. Nine vessels reduced discard ratio in the test fishery, one showed no difference between test and control fishery, while two vessels displayed an increase in discard ratio. Catch compositions also differed, with fewer âchoke speciesâ occurring in the test fisheries and a more valuable size composition. Ultimately, despite smaller landings in multiple vessels, no vessel showed reduction in value-per-unit-effort (VPUE) and one Baltic vessel significantly increased the VPUE. This trial showed that relaxing technical regulations combined with proper incentives has a potential to provide some flexibility to cope with the landing obligation, where unwanted catches could be reduced to some extent without negative effects on economic viability.</jats:p
- âŚ