Search results for "hole"
showing 10 items of 2900 documents
Mine sinkhole in Sicily: geomorphologic and environment hazard
2009
Anthropogenic sinkholes in central-south Sicily
2013
Sinkholes: dissoluzione delle evaporiti in Sicilia centromeridionale
2013
SINKHOLES IN GESSOSO SOLFIFERA FORMATION (CENTRAL SICILY): HISTORICAL RESEARCH
2011
Sirds un asinsvadu slimību riska faktori Latvijā: izplatības tendence 10 gados
2022
Maģistra darba tēma ir sirds un asinsvadu slimību (SAS) riska faktoru izplatības izmaiņu tendences Latvijas iedzīvotāju populācijā 10 gadu laikā. Tēmas aktualitāti nosaka augstā SAS izplatība, kā arī tas, ka SAS ir vadošais priekšlaicīgas nāves iemesls pasaulē un Latvijā. Daudzos gadījumos sirds un asinsvadu slimības var novērst vai krietni attālināt, ievērojot veselīgu dzīvesveidu, kā arī savlaicīgi atklājot un ārstējot riska faktorus. Darba mērķis bija izanalizēt izplatītāko sirds un asinsvadu slimību riska faktoru izplatību, kā arī salīdzinot 2009. un 2019.gadā veikto pētījuma datus, noskaidrot kopējo tendenci SAS riska faktoru izplatībā Latvijas populācijā 10 gadu laikā pa vecuma un dzi…
Connecting others: Does a tertius iungens orientation shape the relationship between research networks and innovation?
2021
Research on social networks and innovation emphasizes that individuals spanning structural holes and crossing institutional boundaries have more opportunities for knowledge recombination and innovation involvement. However, transforming the potential knowledge and resources available through personal networks to attain innovation can be difficult for the focal individual. Using an ego-network approach, this study examines whether and to what extent an individual strategic orientation to cooperation (i.e. tertius iungens) contributes to strengthening the relation between two personal network properties (structural and institutional separation) and involvement in innovation. Our analysis is c…
Pseudospectrum of Reissner-Nordström black holes: Quasinormal mode instability and universality
2021
Black hole spectroscopy is a powerful tool to probe the Kerr nature of astrophysical compact objects and their environment. The observation of multiple ringdown modes in gravitational waveforms could soon lead to high-precision gravitational spectroscopy, so it is critical to understand if the quasinormal mode spectrum is stable against perturbations. It was recently shown that the pseudospectrum can shed light on the spectral stability of black hole quasinormal modes. We study the pseudospectrum of Reissner-Nordstr\"om spacetimes and we find a spectral instability of scalar and gravitoelectric quasinormal modes in subextremal and extremal black holes, extending similar findings for the Sch…
Znaczenie i rola witaminy D w praktyce farmaceutycznej
2022
Pierwsze doniesienia o witaminie D pojawiły się w pierwszej połowie XX w. Jej odkrycie wywarło istotny wpływ na prewencję i leczenie krzywicy, a także umożliwiło poznanie i udokumentowanie roli w regulacji równowagi gospodarki wapniowo-fosforanowej. Dalsze doniesienia sugerują również inne istotne dla zdrowia właściwości witaminy D, w tym wpływ na układ mięśniowy, nerwowy, immunologiczny, krążenia, gospodarkę węglowodanową, otyłość, ryzyko wystąpienia chorób nowotworowych, a także (istotne dziś) zagadnienie wpływu na przebieg i zapadalność na COVID-19. Wyróżniono sześć form witaminy D różniących się strukturą łańcuchów bocznych. Do grupy witaminy D zaliczamy: cholekalcyferol (witamina D3) p…
Luminescence Properties of Non Bridging Oxygen Hole Centers at a Silica Surface
2008
Scattering of Co-Current Surface Waves on an Analogue Black Hole
2018
We report on what is to our knowledge the first scattering experiment of surface waves on an accelerating transcritical flow, which in the analogue gravity context is described by an effective spacetime with a black-hole horizon. This spacetime has been probed by an incident co-current wave, which partially scatters into an outgoing countercurrent wave on each side of the horizon. The measured scattering amplitudes are compatible with the predictions of the hydrodynamical theory, where the kinematical description in terms of the effective metric is exact.