Resonances in ultracold dipolar atomic and molecular gases

A previously developed approach for the numerical treatment of two particles that are confined in a finite optical-lattice potential and interact via an arbitrary isotropic interaction potential has been extended to incorporate an additional anisotropic dipole–dipole interaction (DDI). The interplay of a model but realistic short-range Born–Oppenheimer potential and the DDI for two confined particles is investigated. A variation of the strength of the DDI leads to diverse resonance phenomena. In a harmonic confinement potential some resonances show similarities to s-wave scattering resonances while in an anharmonic trapping potential like the one of an optical lattice additional inelastic confinement-induced dipolar resonances occur. The latter are due to a coupling of the relative and center-of-mass motion caused by the anharmonicity of the external confinement.Peer Reviewe

Ferdydurke

Bruno Schulz: Ferdydurke

Dark interlayer plasmons in colloidal gold nanoparticle bi- and few-layers

We demonstrate the excitation of dark plasmon modes with linearly polarized light at normal incidence in self-assembled layers of gold nanoparticles. Because of field retardation, the incident light field induces plasmonic dipoles that are parallel within each layer but antiparallel between the layers, resulting in a vanishing net dipole moment. Using microabsorbance spectroscopy we measured a pronounced absorbance peak and reflectance dip at 1.5 eV for bi- and trilayers of gold nanoparticles with a diameter of 46 nm and 2 nm interparticle gap size. The excitations were identified as dark interlayer plasmons by finite-difference time-domain simulations. The dark plasmon modes are predicted to evolve into standing waves when further increasing the layer number, which leads to 90% transmittance of the incident light through the nanoparticle film. Our approach is easy to implement and paves the way for large-area coatings with tunable plasmon resonance

Deutsche meereskundliche Untersuchungen in der Nordsee im Sommer 1921

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ICCS 2009 International Report: Civic knowledge, attitudes and engagement among lower secondary school students in thirty-eight countries.

The International Civic and Citizenship Education Study (ICCS) studied the ways in which countries prepare their young people to undertake their roles as citizens. ICCS was based on the premise that preparing students for citizenship roles involves helping them develop relevant knowledge and understanding and form positive attitudes toward being a citizen and participating in activities related to civic and citizenship education. These notions were elaborated in the ICCS framework, which was the first publication to emerge from ICCS (Schulz, Fraillon, Ainley, Losito, & Kerr, 2008)

IEA International Civic and Citizenship Education Study 2016 Assessment Framework

The purpose of the International Civic and Citizenship Education Study (ICCS) is to investigate the ways in which young people are prepared to undertake their roles as citizens in a range of countries in the second decade of the 21th century. ICCS 2016 is a continuation of this study, which was initiated in 2009. The development of a framework for ICCS 2016 needed to take account of recent developments and ongoing challenges. The international project team identified areas related to civics and citizenship education, which had either gained more attention in recent years or were regarded as relevant, but which were not addressed in great detail in the previous ICCS survey. The following three areas were identified for inclusion to broaden the scope of ICCS 2016: environmental sustainability in civic and citizenship education; social interaction in school; and the use of new social media for civic engagement. In addition, two further areas were identified that had been included in previous IEA surveys as deserving more explicit acknowledgement in the ICCS 2016 assessment framework: economic awareness as an aspect of citizenship; and the role of morality in civic and citizenship education. This report is divided into three major sections starting with background and an overview of the current study; followed by the civic and citizenship framework covering definitions and content domains; and finally the contextual framework which looks at the contexts for civic and citizenship education

Abrupt cold events in the North Atlantic Ocean in a transient Holocene simulation

Abrupt cold events have been detected in numerous North Atlantic climate records from the Holocene. Several mechanisms have been discussed as possible triggers for these climate shifts persisting decades to centuries. Here, we describe two abrupt cold events that occurred during an orbitally forced transient Holocene simulation using the Community Climate System Model version 3. Both events occurred during the late Holocene (4305–4267 BP and 3046–3018 BP for event 1 and event 2, respectively). They were characterized by substantial surface cooling (−2.3 and −1.8 ∘C, respectively) and freshening (−0.6 and −0.5 PSU, respectively) as well as severe sea ice advance east of Newfoundland and south of Greenland, reaching as far as the Iceland Basin in the northeastern Atlantic at the climaxes of the cold events. Convection and deep-water formation in the northwestern Atlantic collapsed during the events, while the Atlantic Meridional Overturning Circulation was not substantially affected (weakening by only about 10 % and 5 %, respectively). The events were triggered by prolonged phases of a positive North Atlantic Oscillation that caused substantial changes in the subpolar ocean circulation and associated freshwater transports, resulting in a weakening of the subpolar gyre. Our results suggest a possible mechanism by which abrupt cold events in the North Atlantic region may be triggered by internal climate variability without the need of an external (e.g., solar or volcanic) forcing