Role of multi-level states on quantum-dot emission in photonic-crystal cavities

Semiconductor quantum dots embedded in photonic-crystal nanostructures have been the subject of intense study. In this context, quantum dots are often considered to be simple two-level emitters, i.e., the complexities arising from the internal finestructure are neglected. We show that due to the intricate spatial variations of the electric field polarization found in photonic crystal, the two orthogonal finestructure states of quantum dots in general both couple significantly to a cavity mode, implying that the two-level description is not sufficient. As a consequence the emission dynamics and spectra, which are often recorded in experiments, are modified both in the weak- and strong-coupling regimes. The proposed effects are found to be significant for system parameters of current state-of-the-art photonic-crystal cavities

Regularity of Solutions of the Parabolic Normalized p-Laplace Equation

The parabolic normalized p-Laplace equation is studied. We prove that a viscosity solution has a time derivative in the sense of Sobolev belonging locally to $L^2$

PRETTY: Grazing altimetry measurements based on the interferometric method

The exploitation of signals stemming from global navigation systems for passive bistatic radar applications has beenproposed and implemented within numerous studies. The fact that such missions do not rely on high power amplifiersand that the need of high gain antennas with large geometrical dimensions can be avoided, makes them suitable forsmall satellite missions. Applications where a continuous high coverage is needed, as for example disaster warning,have the demand for a large number of satellites in orbit, which in turn requires small and relatively low cost satellites.The proposed PRETTY (Passive Reflectometry and Dosimetry) mission includes a demonstrator payload for passivereflectometry and scatterometry focusing on very low incidence angles whereby the direct and reflected signal will bereceived via the same antenna. The correlation of both signals will be done by a specific FPGA based hardwareimplementation. The demonstration of a passive reflectometer without the use of local code replica implicitly showsthat also signals of unknown data modulation can be exploited for such a purpose.The PRETTY mission is proposed by an Austrian consortium with RUAG GmbH as prime contractor, relying on theresults from a previous CubeSat mission (OPS-SAT) conducted by TU Graz under ESA contract [18]. Within thepresent paper we will describe the architecture of the passive reflectometer payload within this 3U CubeSat mission anddiscuss operational routines and constraints to be elaborated in the frame of the proposed activity

Befolkningens reaktion på COVID-19 set i lyset af aviser og andre medier: Artikel 2

COVID-19 satte den danske befolkning i en ny og ukendt situation. Så befolkningens vurderinger af risiko og heraf følgende forholdsregler imod smitte var umiddelbart afhængige af de informationer, der blev udbredt gennem pressen. Statens pressehåndtering og mediernes brede opbakning som bliver behandlet trin for trin fra 11. marts til begyndelsen af oktober 2021 fik dermed afgørende betydning. Artiklen er organiseret, således at befolkningens reaktioner på de temaer som surveyet om COVID-19 belyser i temanummerets øvrige artikler, er dækket ind. Det drejer sig om: den gru som pandemien vakte, generelle etiske overvejelser om let og lige adgang til sundhedsvæsnet, arbejdsløshed, klima og ikke mindst religion og COVID-19. Dette tema behandles i forhold til om pandemien kunne skyldes Guds straf, naturens svar på menneskenes mishandling af naturen. Endelig behandles nedlukningen af offentlige ritualer og brugen af private ritualer

Appendix. Metoder og opmærksomhedspunkter

Først og fremmest forklarer appendikset operationaliseringen af surveyet. Dernæst præsenteres beregningerne af forskellige skalaer, det drejer sig om religiøsitet og forskellige skalaer der adresserer det psykiske og eksistentielle velvære. Endelig præsenterer og diskuterer vi problemerne ved at sammenligne surveys indsamlet til forskellig tid og med forskellige udvælgelsesprocedurer af informanterne

Innovative sea surface monitoring with GNSS-REflectometry aboard ISS: overview and recent results from GEROS-ISS

GEROS-ISS (GEROS hereafter) stands for GNSS REflectometry, Radio Occultation and Scatterometry onboard the International Space Station. It is a scientific experiment, proposed to the European Space Agency (ESA) in 2011 for installation aboard the ISS. The main focus of GEROS is the dedicated use of signals from the currently available Global Navigation Satellite Systems (GNSS) for remote sensing of the System Earth with focus to Climate Change characterisation. The GEROS mission idea and the current status are briefly reviewed.Peer ReviewedPostprint (author's final draft

Regularity of solutions of the parabolic normalized p-Laplace equation

The parabolic normalized p-Laplace equation is studied. We prove that a viscosity solution has a time derivative in the sense of Sobolev belonging locally to L2{L^{2}}