1,197 research outputs found
Tap av lam på beite - sammenheng mellom slippvekt og predasjon av jerv, gaupe og rødrev
Nesten to millioner søyer og lam blir sluppet på utmarksbeite i Norge hvert år. Rundt 125 000 av disse kommer ikke tilbake om høsten. Mortalitet grunnet predasjon av fredet rovvilt er økende i mange områder, og miljøforvaltningen betaler årlig ca. 75 millioner kroner i erstatning for rovviltdrepte sauer (www.rovbase.no). Tap av sau kan også skyldes ulykker og sjukdom, og sammenhengene mellom tapsårsaker er komplekse...
Method and apparatus for producing an aircraft flare path control signal
Aircraft altitude, ground velocity, and altitude rate signals are input to a computer which, using a unique control law, generates a pitch control surface command signal suitable for guiding an aircraft on its flare path to a specified runway touchdown point despite varying wind conditions
Aircraft landing control system
Upon aircraft landing approach, flare path command signals of altitude, vertical velocity and vertical acceleration are generated as functions of aircraft position and velocity with respect to the ground. The command signals are compared with corresponding actual values to generate error signals which are used to control the flight path
Effect of mixing and spatial dimension on the glass transition
We study the influence of composition changes on the glass transition of
binary hard disc and hard sphere mixtures in the framework of mode coupling
theory. We derive a general expression for the slope of a glass transition
line. Applied to the binary mixture in the low concentration limits, this new
method allows a fast prediction of some properties of the glass transition
lines. The glass transition diagram we find for binary hard discs strongly
resembles the random close packing diagram. Compared to 3D from previous
studies, the extension of the glass regime due to mixing is much more
pronounced in 2D where plasticization only sets in at larger size disparities.
For small size disparities we find a stabilization of the glass phase quadratic
in the deviation of the size disparity from unity.Comment: 13 pages, 8 figures, Phys. Rev. E (in print
Glass transition of binary mixtures of dipolar particles in two dimensions
We study the glass transition of binary mixtures of dipolar particles in two
dimensions within the framework of mode-coupling theory, focusing in particular
on the influence of composition changes. In a first step, we demonstrate that
the experimental system of K\"onig et al. [Eur. Phys. J. E 18, 287 (2005)] is
well described by point dipoles through a comparison between the experimental
partial structure factors and those from our Monte Carlo simulation. For such a
mixture of point particles we show that there is always a plasticization
effect, i.e. a stabilization of the liquid state due to mixing, in contrast to
binary hard disks. We demonstrate that the predicted plasticization effect is
in qualitative agreement with experimental results. Furthermore, also some
general properties of the glass transition lines are discussed.Comment: 12 pages, 8 figures, J. Non-Cryst. Solids (in print
Diffusionsmålinger med Ramanspektroskopi:Viden om diffusioner er i mange sammenhænge af stor betydning. Her beskrives en simpel måde til at studere diffusioner i væsker
Misinformation about Covid-19 Vaccines on Social Media: Rapid Review
Background: The development of COVID-19 vaccines has been crucial in fighting the pandemic. However, misinformation about the COVID-19 pandemic and vaccines is spread on social media platforms at a rate that has made the World Health Organization coin the phrase infodemic. False claims about adverse vaccine side effects, such as vaccines being the cause of autism, were already considered a threat to global health before the outbreak of COVID-19. Objective: We aimed to synthesize the existing research on misinformation about COVID-19 vaccines spread on social media platforms and its effects. The secondary aim was to gain insight and gather knowledge about whether misinformation about autism and COVID-19 vaccines is being spread on social media platforms. Methods: We performed a literature search on September 9, 2021, and searched PubMed, PsycINFO, ERIC, EMBASE, Cochrane Library, and the Cochrane COVID-19 Study Register. We included publications in peer-reviewed journals that fulfilled the following criteria: original empirical studies, studies that assessed social media and misinformation, and studies about COVID-19 vaccines. Thematic analysis was used to identify the patterns (themes) of misinformation. Narrative qualitative synthesis was undertaken with the guidance of the PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) 2020 Statement and the Synthesis Without Meta-analysis reporting guideline. The risk of bias was assessed using the Joanna Briggs Institute Critical Appraisal tool. Ratings of the certainty of evidence were based on recommendations from the Grading of Recommendations Assessment, Development and Evaluation Working Group. Results: The search yielded 757 records, with 45 articles selected for this review. We identified 3 main themes of misinformation: medical misinformation, vaccine development, and conspiracies. Twitter was the most studied social media platform, followed by Facebook, YouTube, and Instagram. A vast majority of studies were from industrialized Western countries. We identified 19 studies in which the effect of social media misinformation on vaccine hesitancy was measured or discussed. These studies implied that the misinformation spread on social media had a negative effect on vaccine hesitancy and uptake. Only 1 study contained misinformation about autism as a side effect of COVID-19 vaccines. Conclusions: To prevent these misconceptions from taking hold, health authorities should openly address and discuss these false claims with both cultural and religious awareness in mind. Our review showed that there is a need to examine the effect of social media misinformation on vaccine hesitancy with a more robust experimental design. Furthermore, this review also demonstrated that more studies are needed from the Global South and on social media platforms other than the major platforms such as Twitter and Facebook.publishedVersio
Transferred hyperfine interaction at 295 K between the rare-earth ions and the fluorine and lithium nuclei in lithium rare-earth fluorides
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