Search results for "GALA"
showing 8 items of 3348 documents
The role of lipid metabolism in the acquisition of desiccation tolerance inCraterostigma plantagineum: a comparative approach
2013
Summary Dehydration leads to different physiological and biochemical responses in plants. We analysed the lipid composition and the expression of genes involved in lipid biosynthesis in the desiccation-tolerant plant Craterostigma plantagineum. A comparative approach was carried out with Lindernia brevidens (desiccation tolerant) and two desiccation-sensitive species, Lindernia subracemosa and Arabidopsis thaliana. In C. plantagineum the total lipid content remained constant while the lipid composition underwent major changes during desiccation. The most prominent change was the removal of monogalactosyldiacylglycerol (MGDG) from the thylakoids. Analysis of molecular species composition rev…
Priekšlikumi viedā tūrisma attīstībai Rīgas pilsētā
2021
Maģistra darba "Priekšlikumi viedā tūrisma attīstībai Rīgas pilsētā” mērķis ir izpētīt cik lielā mērā Rīgas pilsēta patreiz ir pielāgota viedam tūrismam un izstrādāt rekomendācijas galvaspilsētai viedā tūrisma attīstībai. Pētījums ir balstīts uz frontālās strukturētās intervijas, SVID un PESTLE analīzes, galveno darbības rādītāju noteikšanas un rekomendāciju sastādīšanas metodēm, kā arī literatūras izpēti un analīzi par tēmu. Viedie tūrisma galamērķi ir pievilcīgi, ērti un pieejami visiem apmeklētājiem, piedāvājot dažādus pakalpojums lietotājiem. Šie galamērķi sasaista šos aspektus kopā ar viedās pilsētas principiem, ņemot vērā ne tikai iedzīvotāju, bet arī viesu vajadzības, cenšoties atbal…
Viulunsoiton liikkeiden oppiminen Ivan Galamianin viulunsoiton ja -opetuksen menetelmässä : vertailu ja arviointi motoristen taitojen oppimisen teori…
1997
The XENON1T Dark Matter Experiment
2017
The XENON1T experiment at the Laboratori Nazionali del Gran Sasso (LNGS) is the first WIMP dark matter detector operating with a liquid xenon target mass above the ton-scale. Out of its 3.2 t liquid xenon inventory, 2.0 t constitute the active target of the dual-phase time projection chamber. The scintillation and ionization signals from particle interactions are detected with low-background photomultipliers. This article describes the XENON1T instrument and its subsystems as well as strategies to achieve an unprecedented low background level. First results on the detector response and the performance of the subsystems are also presented. © 2017, The Author(s).
Search for inelastic scattering of WIMP dark matter in XENON1T
2021
We report the results of a search for the inelastic scattering of weakly interacting massive particles (WIMPs) in the XENON1T dark matter experiment. Scattering off $^{129}$Xe is the most sensitive probe of inelastic WIMP interactions, with a signature of a 39.6 keV de-excitation photon detected simultaneously with the nuclear recoil. Using an exposure of 0.89 tonne-years, we find no evidence of inelastic WIMP scattering with a significance of more than 2$\sigma$. A profile-likelihood ratio analysis is used to set upper limits on the cross-section of WIMP-nucleus interactions. We exclude new parameter space for WIMPs heavier than 100 GeV/c${}^2$, with the strongest upper limit of $3.3 \time…
Search for Light Dark Matter Interactions Enhanced by the Migdal Effect or Bremsstrahlung in XENON1T.
2019
Direct dark matter detection experiments based on a liquid xenon target are leading the search for dark matter particles with masses above ∼5 GeV/c2, but have limited sensitivity to lighter masses because of the small momentum transfer in dark matter-nucleus elastic scattering. However, there is an irreducible contribution from inelastic processes accompanying the elastic scattering, which leads to the excitation and ionization of the recoiling atom (the Migdal effect) or the emission of a bremsstrahlung photon. In this Letter, we report on a probe of low-mass dark matter with masses down to about 85 MeV/c2 by looking for electronic recoils induced by the Migdal effect and bremsstrahlung us…
Excess electronic recoil events in XENON1T
2020
We report results from searches for new physics with low-energy electronic recoil data recorded with the XENON1T detector. With an exposure of 0.65 t-y and an unprecedentedly low background rate of $76\pm2$ events/(t y keV) between 1 and 30 keV, the data enables sensitive searches for solar axions, an enhanced neutrino magnetic moment, and bosonic dark matter. An excess over known backgrounds is observed at low energies and most prominent between 2 and 3 keV. The solar axion model has a 3.4$\sigma$ significance, and a 3D 90% confidence surface is reported for axion couplings to electrons, photons, and nucleons. This surface is inscribed in the cuboid defined by $g_{ae}<3.8 \times 10^{-12}$,…
Madonas-Trepes vaļņa dienvidu posma morfoloģija, uzbūve un veidošanās īpatnības
2015
Broks, D., 2015. Madonas – Trepes vaļņa dienvidu posma morfoloģija, uzbūve un veidošanās īpatnības. Bakalaura darbs. Latvijas Universitāte, Rīga, 58 lpp. Bakalaurā darbā ir atspoguļots autora veiktais pētījums par Madonas – Trepes vaļņa dienvidu posma morfoloģiju, uzbūvi un veidošanās īpatnībām. Iegūtie rezultāti liecina, ka pētīto reljefa formu galvenokārt veido glaciotektoniski deformēti glaciofluviālie nogulumi un tā klasificējama kā sabīdījuma gala morēna. Darba apjoms ir 58 lapaspuses, kas ietver 4 nodaļas, 28 attēlus un 1 pielikumu.