Search results for "ground"
showing 10 items of 2432 documents
1,2-DICHLOROETHANE CONTAMINATED AQUIFER: MICROBIAL COMMUNITY RESPONSE TO BIOSTIMULATION IN MICROCOSM
2022
Study of anthropogenic sinkholes in the Marsala area (western Sicily) through numerical analyses of instability processes in underground quarries
2011
Search for low-energy neutrinos from astrophysical sources with Borexino
2019
We report on searches for neutrinos and antineutrinos from astrophysical sources performed with the Borexino detector at the Laboratori Nazionali del Gran Sasso in Italy. Electron antineutrinos ($\bar{\nu}_e$) are detected in an organic liquid scintillator through the inverse $\beta$-decay reaction. In the present work we set model-independent upper limits in the energy range 1.8-16.8 MeV on neutrino fluxes from unknown sources that improve our previous results, on average, by a factor 2.5. Using the same data set, we first obtain experimental constraints on the diffuse supernova $\bar{\nu}_e$ fluxes in the previously unexplored region below 8 MeV. A search for $\bar{\nu}_e$ in the solar ne…
Borexino’s search for low-energy neutrino and antineutrino signals correlated with gamma-ray bursts
2017
International audience; A search for neutrino and antineutrino events correlated with 2350 gamma-ray bursts (GRBs) is performed with Borexino data collected between December 2007 and November 2015. No statistically significant excess over background is observed. We look for electron antineutrinos ( ν¯e ) that inverse beta decay on protons with energies from 1.8 MeV to 15 MeV and set the best limit on the neutrino fluence from GRBs below 8 MeV. The signals from neutrinos and antineutrinos from GRBs that scatter on electrons are also searched for, a detection channel made possible by the particularly radio-pure scintillator of Borexino. We obtain currently the best limits on the neutrino f…
Oppilaiden näkemyksiä luonnontieteiden opettajan auktoriteetistä
2019
Tässä tutkimuksessa selvitettiin oppilaiden näkemyksiä luonnontieteiden opettajan auktoriteetista, sen muodostumisesta ja kehittämisestä. Tutkimus pohjautuu fenomenologis-hermeneuttisen tutkimuksen piirteisiin. Oppilaiden (N = 25) näkemyksiä selvitettiin kyselytutkimuksen avulla ja tutkimusaineisto analysoitiin sekä tilastollisen analyysin että aineistolähtöisen sisällönanalyysin keinoin. Tulosten perusteella auktoriteetti liitettiin osaksi opettajan persoonaa ja asiantuntijuutta. Osaltaan auktoriteetin katsottiin tarkoittavan myös vuorovaikutussuhdetta, jossa opettajalla on oppilasta enemmän valtaa. Auktoriteetin koettiin muodostuvan vuorovaikutussuhteessa, jossa merkittäviä tekijöitä oliv…
L’autoreprésentation féminine dans la bande dessinée pornographique
2017
What happens when feminine authors investigate porn-comics and draw themselves in it ? Self-depiction of feminine authors conveys something original in a field where it usually is a way to express a private fantasy. From feminist comics of the 70s to the most recent porn comics, authors’ bodies are not sex objects anymore, they are the subject of a narration. Self-depiction is a new material for porn-comics and gives sincerity to the stories, it may be a way to express political views. Self-fantasy, sex confession or physical metamorphosis are the multiple ways self-depiction provides the feminine author to strengthen her authorship. Implicitly those self-depicted porn-authors draw up an in…
Time-integrated Neutrino Source Searches with 10 years of IceCube Data
2020
Physical review letters 124(5), 051103 (1-9) (2020). doi:10.1103/PhysRevLett.124.051103
Neutrinos below 100 TeV from the southern sky employing refined veto techniques to IceCube data
2020
Many Galactic sources of gamma rays, such as supernova remnants, are expected to produce neutrinos with a typical energy cutoff well below 100 TeV. For the IceCube Neutrino Observatory located at the South Pole, the southern sky, containing the inner part of the Galactic plane and the Galactic Center, is a particularly challenging region at these energies, because of the large background of atmospheric muons. In this paper, we present recent advancements in data selection strategies for track-like muon neutrino events with energies below 100 TeV from the southern sky. The strategies utilize the outer detector regions as veto and features of the signal pattern to reduce the background of atm…
Comparison between simulated and observed LHC beam backgrounds in the ATLAS experiment at E beam =4 TeV
2018
Results of dedicated Monte Carlo simulations of beam-induced background (BIB) in the ATLAS experiment at the Large Hadron Collider (LHC) are presented and compared with data recorded in 2012. During normal physics operation this background arises mainly from scattering of the 4 TeV protons on residual gas in the beam pipe. Methods of reconstructing the BIB signals in the ATLAS detector, developed and implemented in the simulation chain based on the FLUKA Monte Carlo simulation package, are described. The interaction rates are determined from the residual gas pressure distribution in the LHC ring in order to set an absolute scale on the predicted rates of BIB so that they can be compared qua…
Spectral shapes of forbidden argon β decays as background component for rare-event searches
2018
The spectral shape of the electrons from the two first-forbidden unique ${\beta }^{-}$ decays of 39Ar and 42Ar were calculated for the first time to the next-to-leading order. Especially the spectral shape of the 39Ar decay can be used to characterize this background component for dark matter searches based on argon. Alternatively, due to the low thresholds of these experiments, the spectral shape can be investigated over a wide energy range with high statistics and thus allow a sensitive comparison with the theoretical predictions, in particular at low electron energies where the shape of the computed β spectrum has a slight dependence on the value of the weak axial-vector coupling constan…