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Context. We describe the atomic and molecular data that were used for the abundance analyses of FGK-type stars carried out within the Gaia-ESO Public Spectroscopic Survey in the years 2012 to 2019. The Gaia-ESO Survey is one among several current and future stellar spectroscopic surveys producing abundances for Milky-Way stars on an industrial scale. Aims. We present an unprecedented effort to cre
We present and discuss new determinations of metallicity, rotation, age,kinematics, and Galactic orbits for a complete, magnitude-limited, andkinematically unbiased sample of 16 682 nearby F and G dwarf stars. Our∼63 000 new, accurate radial-velocity observations for nearly 13 500stars allow identification of most of the binary stars in the sampleand, together with published uvbyβ photometry, Hipp
Galactic Archaeology is the study of the formation and evolution of the Milky Way through the properties of stars and stellar populations. The combination of stellar ages, chemical compositions, positions, and velocities can reveal the history of star formation and chemical enrichment in different regions of the Galaxy. A large number of stellar spectroscopic, photometric, and astrometric surveys
Det finns åtta planeter i bana runt vår egen stjärna Solen och flera dvärgplaneter. Astronomer har numera upptäckt avlägsna exoplaneter kretsande runt andra stjärnor i vår galax Vintergatan. Här lyfter vi blicken upp och beundrar nattens alla stjärnor och stjärnbilder och följer astronomerna på deras upptäcktsfärd bland avlägsna exoplaneter.Orbiting our star, the Sun, there are eight planets and several dwarf planets. Astronomers have now discovered planets orbiting several nearby stars in our galaxy, the Milky Way. In this planetarium show we look up into the starry night sky, familiarize ourselves with the stars and the constellations, and together we discover the exoplanets out there and how they can be detected.
När vi tittar upp mot natthimlen för att utforska stjärnorna i rymden, så är stjärnspektroskopi ett av de främsta medlen. Med hjälp av den metoden kan vi komma fram till vilka kemiska element en stjärna består av, och eftersom en stjärnas sammansättning i stort sett inte förändras över tiden, därmed få en bild av vilka kemiska element stjärnan bestod av när den föddes. Naturvetenskapliga teorier hA major avenue in the study of the Galaxy is the investigation of stellar populations and Galactic chemical evolution by stellar spectroscopy. Due to the dust obscuration in the line-of-sight, stars in the plane and toward the centre of the Galaxy can only be observed in the near-IR wavelength region. Important questions can thus be addressed by observing stars in the near-IR, a field that is in r
Partikelfysikens standardmodell är en av de mest exakta modellerna inom fysiken. Den beskriver interaktionerna mellan fundamentala partiklar som kvarkar och leptoner, hur Higgspartikeln ger massa till andra partiklar och tre av universums fyra fundamentala krafter: elektromagnetism, svag växelverkan och stark kärnkraft. Tyvärr finns det frågor som inte ens standardmodellen kan svara på. "Varf
Quantum key distribution (QKD) is a secure encryption key generation process to be used by two users in the presence of an eavesdropper. The no-cloning theorem allows the sender "Alice" to securely send qubits with single photons to the receiver "Bob". However, due to real-life imperfections, it is not always possible to have a single-photon source with its properties matching Since the dawn of the first civilizations, the security of information has proven vital to the success of any given community. History records the first attempts at using cryptography techniques in a 1900 BC to 600 BC time frame. In ancient times, the working mechanism of this technique involved the use of letters in the alphabet. To secure the information, these techniques shifted the letters’ nu
Ecoist AB utvecklar en prototyp till en trehjulig elbil för två personer. Två komponenter till fordonet har undersökts: den övre bärarmen i den främre hjulupphängningen och en bussning som sitter i denna bärarm. Målet med examensarbetet har varit att se om det finns några funktionella eller ekonomiska fördelar med att tillverka dessa genom 3D-printing. Olika sätt att framställa komponenterna har u
Exact analytical expressions for the ∆S = 1 coupling Im GE in terms of observable spectral functions are given. This coupling determines the size of the ∆I = 3/2 contribution to ε′ . We show analytically how the scheme-dependence and scale dependences vanish to all orders in 1/Nc and NLO in αS explicitly both for Q7 and Q8 . Numerical results are derived for both Q7 and Q8 from the τ-data and know
A feed-forward neural network method is developed for reconstructing the invariant mass of hadronic jets appearing in a calorimeter. The approach is illustrated in W→qq, where W-bosons are produced in pp reactions at SPS collider energies. The neural network method yields results that are superior to conventional methods. This neural network application differs from the classification ones in the
A model for total cross sections with virtual photons is presented. In particular γ*p and γ*γ* cross sections are considered. Our approach extends on a model for photoproduction, where the total cross section is subdivided into three distinct event classes: direct, VMD and anomalous. With increasing photon virtuality, the latter two decrease in importance. Instead Deep Inelastic Scattering dominat
Gas turbines, in simple and combined cycle, are common and economically profitable on the power generating market today. Several new cycles have been proposed as future competing technologies, but all studies about these cycles have, so far, been paperwork. The requirements for these new cycles are better efficiency than those of today, provide better flexibility, offer short start up times, less
The 3s(2)3p(2 3)P(1.2)-3s3p(3) S-5(2) intercombination lines for Si-like Rh have been investigated using the techniques of beam-foil spectroscopy. Two lines have been identified as belonging to these transitions having, however, different wavelengths from what would be expected based on published iso-electronic trends. The identifications suggested here are strengthened by requirements on (a) the
SO2 plays an important role in the atmospheric chemistry of the Earth, Venus, and Io. This paper presents photoabsorption cross sections of SO2 from 213 to 325 nm at 198 K, encompassing the (C) over tilde B-1(2) - (X) over tilde (1)A(1) and (B) over tilde B-1(1) - (X) over tilde (1)A(1) electronic bands. These measurements are part of a series of measurements over the 160 to 300 K temperature rang
Transition isotope shifts of 3s-3p transitions in Ne II and Ne III are measured in Fourier transform spectra from a hollow-cathode source. Accurate absolute line-center positions of the Ne-20 isotope are derived for the purpose of tertiary wavelength standards in the region 2000-5000 angstrom. A robust statistical treatment is applied, yielding line-position uncertainties that are lower than for t
Organisationer väljer idag i större utsträckning att övergå från traditionella medier till digitala plattformar för att kommunicera sin varumärkesidentitet. Digital marknadsföring ger organisationer möjlighet att nå ut till en stor publik, kommunicera sitt varumärke och lyfta upp deras värderingar. I samband med denna utveckling har organisationer idag ett större behov av att differentiera sig fråOrganizations are increasingly choosing to switch from traditional media to digital platforms to communicate their brand identity. Digital marketing gives organizations the opportunity to reach out to a larger audience, communicate their brand and express their values. In coherence with this development, organizations have a greater need to differentiate themselves from competitors and take action
I Sverige finns ingen författningsreglerad minimilön eller möjlighet att göra kollektivavtal allmängiltiga. Istället är det arbetsmarknadens parter som tillsammans förhandlar fram kollektivavtalets innehåll om löner och andra anställningsvillkor. Den svenska arbetsrätten har en tradition av långtgående fackligt inflytande och avsaknad av statlig inblandning. Staten har uttryckt att författningsregIn Sweden, there is an absence of a minimum wage legislation. The terms and conditions for most workers is constituted in the collective agreement, made by the parties of the Swedish labour market. The government has expressed itself unable to legislate in the matter as it would mean a violation to the “Swedish labour model”, keeping its neutral policy intact. The collective agreement has a very s
