Search results for "Elektroni"
showing 10 items of 417 documents
Facebook’s Emotional Contagion Experiment as a Challenge to Research Ethics
2016
This article analyzes the ethical discussion focusing on the Facebook emotional contagion experiment published by the <em>Proceedings of the National Academy of Sciences</em> in 2014. The massive-scale experiment manipulated the News Feeds of a large amount of Facebook users and was successful in proving that emotional contagion happens also in online environments. However, the experiment caused ethical concerns within and outside academia mainly for two intertwined reasons, the first revolving around the idea of research as manipulation, and the second focusing on the problematic definition of informed consent. The article concurs with recent research that the era of social med…
Harder, Better, Faster, Stronger? The Relationship between Cognitive Task Demands in Video Games and Recovery Experiences
2019
Research has repeatedly demonstrated that the use of interactive media is associated with recovery experiences, suggesting that engaging with media can help people to alleviate stress and restore mental and physical resources. Video games, in particular, have been shown to fulfil various aspects of recovery, not least due to their ability to elicit feelings of mastery and control. However, little is known about the role of cognitive task demand (i.e., the amount of cognitive effort a task requires) in that process. Toward this end, our study aimed to investigate how cognitive task demand during gameplay affects users’ recovery experiences. Results of a laboratory experiment suggest that dif…
Elektronische Tagebücher optimieren die Kognitive Verhaltenstherapie bei Krankheitsängsten : eine randomisiert-kontrollierte Studie
2015
Zentrale Komponenten in kognitiv-behavioralen Erklärungsmodellen der Hypochondrie und den daraus abgeleiteten Behandlungen sind eine selektive Aufmerksamkeitslenkung auf körperliche Empfindungen und ein katastrophisierender Symptominterpretationsbias. Wir untersuchten, ob sich die Effektivität einer störungsspezifischen Kognitiven Verhaltenstherapie (KVT) für Patienten mit Hypochondrie durch ein zusätzliches zweiwöchiges elektronisches Tagebuchtraining (TBT), das auf eine Korrektur der Symptominterpretationen abzielt, verbessern lässt. Zu diesem Zweck wurden 35 Patienten mit Hypochondrie randomisiert zwei Interventionsformen zugewiesen: Gruppe 1 (N = 16) erhielt vor der KVT (16 Einzelsitzu…
Protonation-induced fluorescence modulation of carbazole-based emitters
2022
The development of purely organic fluorescence emitters is of great importance for their low cost and high performance. Responding to this demand, carbazole is a promising emitter due to its extensive freedom for functionalisation, high thermal and chemical stability, as well as low cost. Herein, the effect of protonation on the fluorescence of various pyridine-functionalised carbazole-based bipolar host materials was studied both in solution and in the solid-state. The restriction of intramolecular rotation of the molecules upon protonation of the pyridyl-moiety together with easier planarization of the protonated acceptor and the donor moieties and relocalisation of the LUMO orbital on th…
Necessary and Sufficient Conditions for an Extended Noncontextuality in a Broad Class of Quantum Mechanical Systems
2015
The notion of (non)contextuality pertains to sets of properties measured one subset (context) at a time. We extend this notion to include so-called inconsistently connected systems, in which the measurements of a given property in different contexts may have different distributions, due to contextual biases in experimental design or physical interactions (signaling): a system of measurements has a maximally noncontextual description if they can be imposed a joint distribution on in which the measurements of any one property in different contexts are equal to each other with the maximal probability allowed by their different distributions. We derive necessary and sufficient conditions for th…
Quantum algorithm complexity
2008
Elektroniskā versija nesatur pielikumus
Rīks standartizēta formatējuma dokumentu veidošanai
2016
Standartizēti dokumenti tiek plaši lietoti gan akadēmiskajā, gan tehniskajā vidē, tomēr nav pieejami rīki, ar kuriem varētu pārbaudīt dokumentu atbilstību tehniska noformējuma standartam. Šī darba ietvaros tika izvirzīta hipotēze, ka ar RELAX NG shēmu var nodefinēt dokumentu noformējuma standartu, pēc kura būtu iespējams pārbaudīt ODF formāta dokumentus. Pēc praktiskās daļas pētījuma hipotēze tika apstiprināta – ar RELAX NG shēmu var uzdot prasības, kurus parasti definē noformējuma standarti. No šīs metodikas problēmām jāakcentē shēmas sarežģītā struktūra pat vienkāršu nosacījumu definēšanai.
Взаимодействие свободного и связанного в атоме электрона с сильным полем излучения
1983
Nanoscale etching of III-V semiconductors in acidic hydrogen peroxide solution: GaAs and InP, a striking contrast in surface chemistry
2019
In this study of nanoscale etching for state-of-the-art device technology, the importance of surface chemistry, in particular the nature of the surface oxide, is demonstrated for two III-V materials. Striking differences in etching kinetics were found for GaAs and InP in sulphuric and hydrochloric acidic solutions containing hydrogen peroxide. Under similar conditions, etching of GaAs was much faster, while the dependence of the etch rate on pH, and on H2O2 and acid concentrations also differed markedly for the two semiconductors. Surface analysis techniques provided information on the product layer present after etching: strongly non-stoichiometric porous (hydr)oxides on GaAs and a thin st…
Bibliotēka kā universitātes informācijas un mācību telpa
2014
Latvijas Universitātes un Ukrainas sadraudzības augstskolu pētnieku un bibliotēku darba profesionāļu rakstu kopīgais krājums atspoguļo bibliotēku un informācijas nozares zinātniskās un lietišķās pētniecības darba rezultātus. Rakstu autori analizē bibliotēku pakalpojumu mērķtiecīgo attīstību mūsdienu informācijas vidē un augstskolu mācību infrastruktūrā. --- The collection of papers of the researchers and library professionals of the University of Latvia and Ukrainian universities reflects on scientific and applied research activities. The authors of the articles describe the purposeful development of library services in the modern-day information world and academic infrastructure.