Search results for "RL"
showing 10 items of 13546 documents
Pulsed flow-through cultivation of Margaritifera margaritifera : effects of water source and food quantity on the survival and growth of juveniles
2020
AbstractConservation of the endangered freshwater pearl mussel (FPM) includes artificially rearing juveniles, but the pulsed flow-through (PFT) method, enabling the continuous renewal of water and food in culture containers, has not been applied to FPM. This study tested the PFT method in culture of FPM juveniles, and the effect of water source (tap vs well water) and food concentration (mixture of commercial phytoplankton products) on the survival and growth of juveniles. Beaker-specific survival rates varied from 0 to 100% (mean: 34%) and from 0 to 58% (mean: 16%) in the 1st (2-week) and 2nd (10-week) experiment, respectively. In the 1st experiment, juveniles attained statistically signif…
Associations of near work time, watching TV, outdoors time, and parents' myopia with myopia among school children based on 38-year-old historical dat…
2021
Purpose To study the prevalence and risk factors of myopia with data from a questionnaire study conducted in 1983 among Finnish school children. Methods School children (n = 4 961) from the 1st, 5th and 8th grades of school (7-, 11- and 15-year-olds) in Central Finland were screened for vision followed by a questionnaire, which was returned by 4 352 (87.7%) participants. Myopia was categorized based on the questionnaire. Items concerned daily time spent on near work and outdoor activities, excluding time spent at school, watching TV and parental myopia and the associations of myopia with these factors were studied. Results The prevalence of myopia was 3%, 15% and 27% among the 7-, 11- and 1…
Sand Play for 0–8-Year-Old Children’s Health and Development: A Systematic Review Protocol
2021
Sand play may be a significant determinant of health and development in early childhood, but systematically synthesised evidence is absent in the literature. The main objective of this study was to present a planned methodology to systematically review, and synthesise, the evidence regarding sand play and its associations with 0–8-year-old children’s health and development. The systematic review following the Preferred Reporting Items for Systematic Reviews and Meta-Analyses Protocols statement was registered to PROSPERO (CRD42021253852). Literature searches will be conducted using information from eight electronic databases. Studies will be included when participating children were aged 0–…
Ultra-High Energy Neutrinos at the Pierre Auger Observatory
2013
The observation of ultrahigh energy neutrinos (UHE nu s) has become a priority in experimental astroparticle physics. UHE nu s can be detected with a variety of techniques. In particular, neutrinos can interact in the atmosphere (downward-going nu) or in the Earth crust (Earth-skimming nu), producing air showers that can be observed with arrays of detectors at the ground. With the surface detector array of the Pierre Auger Observatory we can detect these types of cascades. The distinguishing signature for neutrino events is the presence of very inclined showers produced close to the ground (i.e., after having traversed a large amount of atmosphere). In this work we review the procedure and …
Age of Information Based URLLC-enabled UAV Wireless Communications System
2022
This paper considers an unmanned aerial vehicles (UAV) communication network, where UAV operate as an aerial mobile relay between a source and a destination of the network. To capture the “timelines” of the received information at the destination node, a new performance metric named age of information (AoI) is considered. In addition, a short packet communication scheme maintains low latency in the proposed UAV wireless communication system. The finite block-length theory investigates the performances of short packet communications scheme in the UAV-assisted wireless communications system. In this paper, the Average Age of Information (AAoI) is estimated by applying the Stochastic Hybrid Sy…
Ultraviolet A1 radiation induces nitric oxide synthase-2 expression in human skin endothelial cells in the absence of proinflammatory cytokines.
2001
Skin exposure to ultraviolet radiation from sunlight causes erythema and edema formation as well as inflammatory responses. As some of these ultraviolet-induced effects are potentially mediated by nitric oxide synthases, we examined the role of cytokines and ultraviolet A 1 radiation (340–400 nm) on the expression of the nitric oxide synthase-2 in endothelia of normal human skin biopsies during short-term organ culture as well as expression and activity of the nitric oxide synthase-2 in in vitro cell cultures of human dermal endothelial cells. Both, cytokine challenge (interleukin-1β + tumor necrosis factor-α + interferon-γ) but also ultraviolet A 1 exposure (50 J per cm 2 ) in the absence …
Revisiting neutralization theory and its underlying assumptions to inspire future information security research
2022
Over two decades ago, neutralization theory was introduced to information systems research from the field of criminology and is currently emerging as an influential foundation to both explain and solve the information security policy noncompliance problem. Much of what we know about the theory focuses exclusively on the neutralization techniques identified in the original as well as subsequent criminological writings. What is often left unexamined in IS research is the underlying assumptions about the theory’s core elements; assumptions about the actor, the act, the normative system, and the nature of neutralizing itself. The objective of this commentary is to revisit the origin of neutrali…
The Problematic of Conceptualizing a European Cultural Heritage
2016
The idea of a common European cultural heritage is frequently referred to in the political discourses and practices of the EU. The idea of a European cultural heritage elevates the ideas of ownership and inheritance beyond the local, regional, or national frameworks and transforms the heritage sites and objects into a ‘common good’ belonging to all Europeans and into a source of a common European cultural identity. Scholars have debated the possibility of a common European cultural heritage, and in case such could exist, what it could be grounded upon. Critical scholars have asked what might be the trans-border European dimension of heritage that goes beyond the mere sum of national, region…
"Service-learning" within Physical Education university degrees: Physical exercise for elderly people
2016
La sociedad actual demanda cada vez más una participación ciudadana con carácter social hacia colectivos en riesgo de exclusión social. La universidad, apelando a su responsabilidad social en el ámbito docente, debería facilitar dicha participación y fomentar en el alumnado la transmisión de valores tanto éticos como de concienciación hacia los demás. Un método pedagógico útil para cristalizar este compromiso firme con determinados colectivos que realmente lo necesitan es el «aprendizaje-servicio» (en adelante ApS). En este contexto, el presente estudio justifica la idoneidad y viabilidad de desarrollar proyectos de ApS con el colectivo de personas mayores dentro de los grados universitario…
L'université face au déferlement numérique
2016
International audience