Search results for "feature"
showing 10 items of 4091 documents
Žurnāla “Forbes” ziņu lingvistiskās iezīmes Facebook vietnē
2019
Lai gan internets un tehnoloģijas nav vienīgie faktori, kas mūsdienās sekmē izmaiņas valodā, tie noteikti ir snieguši savu ieguldījumu. Tā kā tīmekļa valodas un sociālo tīklu jēdzieni ir salīdzinoši jauni, nav daudz pētījumu veikti par tīmekļa lingvistiskajām iezīmēm. Tāpēc šī darba mērķis ir izpētīt valodas iezīmes Forbes ierakstos Facebook vietnē. Kā pētījuma metodes tiek izmantots literatūras apskats un kvantitatīva un kvalitatīva uz teksta krājuma balstīta lingvistiskā analīze kā arī tiek izmantota aptauja. Analīze atklāj, ka Forbes Facebook ierakstu nozīmīgākās valodas iezīmes ir trešās personas vietniekvārdi, modālie darbības vārdi, kas attiecas uz atļauju, iespēju vai spēju, vienkārš…
Antiutopiskie romāni pusaudžiem „Citādie”, „Delīrijs”, „Devējs”
2015
Šis pētījums ir veltīts antiutopiskās pusaudžu literatūras analīzei V. Rotas grāmatā „Citādie”, L. Oliveras romānā „Delīrijs” un L. Lorijas darbā „Devējs”. Darba teorētisko daļu veido informācija par pusaudžiem domāto literatūru utopiskās un antiutopiskās literatūras žanru attīstību. Praktiskā daļa veltīta antiutopijas pazīmju analīzei pusaudžiem paredzētajās grāmatās „Citādie”, „Delīrijs” un „Devējs”. Pētījumā izmantota kvalitatīvā pētījumu metode, kas sevī ietver saistīto teoriju izpēti un kontrastīvo analīzi, romānu „Citādie”, „Delīrijs” un „Devējs” tuvlasījumu metodi, satura analīzi, interpretāciju, kopsavilkumu un secinājumus. Iegūtā informācija ļauj veikt antiutopijas iezīmju analīzi …
Carbon dynamics in highly heterotrophic subarctic thaw ponds
2015
Abstract. Global warming has accelerated the formation of permafrost thaw ponds in several subarctic and arctic regions. These ponds are net heterotrophic as evidenced by their greenhouse gas (GHG) supersaturation levels (CO2 and CH4), and generally receive large terrestrial carbon inputs from the thawing and eroding permafrost. We measured seasonal and vertical variations in the concentration and type of dissolved organic matter (DOM) in five subarctic thaw (thermokarst) ponds in northern Quebec, and explored how environmental gradients influenced heterotrophic and phototrophic biomass and productivity. Late winter DOM had low aromaticity indicating reduced inputs of terrestrial carbon, wh…
Autochthonous organic matter promotes DNRA and suppresses N2O production in sediments of the coastal Baltic Sea
2021
Coastal environments are nitrogen (N) removal hot spots, which regulate the amount of land-derived N reaching the open sea. However, mixing between freshwater and seawater creates gradients of inorganic N and bioavailable organic matter, which affect N cycling. In this study, we compare nitrate reduction processes between estuary and offshore archipelago environments in the coastal Baltic Sea. Denitrification rates were similar in both environments, despite lower nitrate and carbon concentrations in the offshore archipelago. However, DNRA (dissimilatory nitrate reduction to ammonium) rates were higher at the offshore archipelago stations, with a higher proportion of autochthonous carbon. Th…
Carbon Budget and Molecular Structure of Natural Organic Matter in Bank Infiltrated Groundwater
2021
Groundwater : : journal of the Association of Ground-Water Scientists and Engineers, a division of the National Ground Water Association (2021). doi:10.1111/gwat.13087
Low-rank approximation based non-negative multi-way array decomposition on event-related potentials
2014
Non-negative tensor factorization (NTF) has been successfully applied to analyze event-related potentials (ERPs), and shown superiority in terms of capturing multi-domain features. However, the time-frequency representation of ERPs by higher-order tensors are usually large-scale, which prevents the popularity of most tensor factorization algorithms. To overcome this issue, we introduce a non-negative canonical polyadic decomposition (NCPD) based on low-rank approximation (LRA) and hierarchical alternating least square (HALS) techniques. We applied NCPD (LRAHALS and benchmark HALS) and CPD to extract multi-domain features of a visual ERP. The features and components extracted by LRAHALS NCPD…
Performance Evaluation of EEG Based Mental Stress Assessment Approaches for Wearable Devices
2021
Mental stress has been identified as the root cause of various physical and psychological disorders. Therefore, it is crucial to conduct timely diagnosis and assessment considering the severe effects of mental stress. In contrast to other health-related wearable devices, wearable or portable devices for stress assessment have not been developed yet. A major requirement for the development of such a device is a time-efficient algorithm. This study investigates the performance of computer-aided approaches for mental stress assessment. Machine learning (ML) approaches are compared in terms of the time required for feature extraction and classification. After conducting tests on data for real-t…
Halogens and trace metal emissions from the ongoing 2008 summit eruption of Kīlauea volcano, Hawai`i
2012
Volcanic plume samples taken in 2008 and 2009 from the Halemàumàu eruption at Kīlauea provide new insights into Kīlauea's degassing behaviour. The Cl, F and S gas systematics are consistent with syn-eruptive East Rift Zone measurements suggesting that the new Halemàumàu activity is fed by a convecting magma reservoir shallower than the main summit storage area. Comparison with degassing models suggests that plume halogen and S composition is controlled by very shallow (<3m depth) decompression degassing and progressive loss of volatiles at the surface. Compared to most other global volcanoes, Kīlauea's gases are depleted in Cl with respect to S. Similarly, our Br/S and I/S ratio measurem…
Elemental and isotope covariation of noble gases in mineral phases from Etnean volcanics erupted during 2001–2005, and genetic relation with peripher…
2008
Abstract During 2001–2005, Mount Etna was characterized by intense eruptive activity involving the emission of petrologically different products from several vents, which involved at least two types of magma with different degrees of evolution. We investigated the ratios and abundances for noble-gas isotopes in fluid inclusions trapped in olivines and pyroxenes in the erupted products. We confirm that olivine has the most efficient crystalline structure for preserving the pristine composition of entrapped gases, while pyroxene can suffer diffusive He loss. Both the minerals also experience noble gas air contamination after eruption. Helium isotopes of the products genetically linked to the …
Motor imagery in unipolar major depression
2014
International audience; Background: Motor imagery is a potential tool to investigate action representation, as it can provide insights into the processes of action planning and preparation. Recent studies suggest that depressed patients present specific impairment in mental rotation. The present study was designed to investigate the influence of unipolar depression on motor imagery ability. Methods: Fourteen right-handed patients meeting DSM-IV criteria for unipolar depression were compared to 14 matched healthy controls. Imagery ability was accessed by the timing correspondence between executed and imagined movements during a pointing task, involving strong spatiotemporal constraints (spee…