Since the 1960s, the United States has experienced steady declines in news consumption and commensurate attrition in civic engagement and political participation. Americans read newspapers at less than one fourth the rate of 60 years ago; voter turnout has fallen to the point where the U.S. ranks 23 out of 24 established democracies; signing petitions, volunteering for a civic organization like the PTA and political party affiliation are all at contemporary lows. But these indicators only tell half the story…the younger half. Because among Americans over age 50, attrition in all these areas is much milder; among those under age 30 they are much steeper. So do young adults get news? If so, how do they get news? If not, how do they find out about things? A 21-year old journalism student reported that: “I usually just hear it from friends, when I talk to friends.” The present study employed four methods: Secondary analysis of longitudinal Pew data; interviews and focus groups about news consumption and media use habits, including social media and wireless devices; a survey on social media use and its relationship to news and news knowledge; and an experiment testing a novel game as a way to convey news and civics knowledge, all involving students at three large state universities. Findings include the following: students often rank social media use, like Facebook, as their most important and most-used media; social media are negatively related with traditional news use and with news knowledge; students draw clear and important distinctions between news and information; one method of teaching (direct instruction) works well while another (a news game) works, but not as well. Of particular interest is the role of opinion leaders in the two-step flow of news, and the role of relevance and need for orientation in agenda setting. Novel contributions include a clearer definition of students’ distinction between news and important information as they define it, a framework by which to experiment with creating an interactive game using news to promote news seeking, and some provocative recommendations for future research. / text

Syfte: Syftet med denna uppsats var att undersöka informationsinhämtningen hos folk i vår närhet angående COVID-19. Vi ville veta vilken plattform dessa människor får/fått sin primära information under dessa två perioder, men också få en förståelse kring vilka informationskällor som de tycker/tyckte vsr viktigast för dem.Forskningsfrågor: Vilka plattformar har folk i vår närhet under Varningsperioden och Rekylperioden? Vilka informationskällor var viktiga för folk i vår närhet under Varningsperioden och Rekylperioden? Vilka medier/plattformar har folk i vår närhet mest förtroende för under Varningsperioden och Rekylperioden?Metod: Vår studie genomfördes med hjälp utav en kvantitativ enkätundersökning. Studien använde sig utav en kvantitativ och tvärsnittsdesign, även kallad survey design.Resultat: Resultatet i vår enkätundersökning visade tydligt att respondenterna primära informationsinhämtning kom genom olika plattformar från myndigheterna, deras hemsidor och sociala medier under båda dessa perioder. Bortser vi myndigheterna, så var de journalistiska nyhetsmedierna respondenternas andrahandsval. När det gäller respondenternas viktigaste informationskällor under dessa två perioder, så föredrog de myndigheternas hemsidor och de journalistiska nyhetsmedierna. Angående respondenternas förtroende för medier under dessa två perioder, så visade det sig att respondenterna hade mest förtroende för medier under dessa två perioder, så visade det sig att respondenterna hade mest förtroende för myndigheterna, och förtroendet har stigit med tiden. Respondenternas engagemang låg överlägset mest hos myndigheterna under både Varningsperioden och Rekylperioden.Slutsats: Vår enkätundersökning visade tydligt att folk i vår närhets primära informationsinhämtning angående COVID-19 kom genom olika plattformar från myndigheterna, såsom Folkhälsomyndigheten och 1177 Vårdguiden under både Varningsperioden och Rekylperioden. De journalistiska nyhetsmedierna var respondenternas andrahandsval, såsom Aftonbladet och SVT under båda perioderna. Respondenternas förtroende under båda perioderna var starkast för myndigheterna, såsom Folkhälsomyndigheten, och i nuläget var det jämnt med hos båda två. Lägst trovärdighet var för sociala medier.

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This diploma thesis is thematically oriented towards early theories of public opinion of the late 19th century. Concretely, it deals with the theories of Alexis de Tocqueville, John Stuart Mill and James Bryce. The thesis presents an analysis, interpretation and a comparison of these three thinkers and concentrates on the following topics: the definition of the term "public opinion"; the formation of public opinion; the influence individuals, groups and society as a whole have on public opinion; and the role the media play in public opinion. Further, it shows how these authors' thoughts are continued in selected 20th century theories of public opinion, namely in Walter Lippmann's concept of public opinion, the Two-step flow model developed by Elihu Katz and Paul Lazarsfeld, Elisabeth Noelle-Neumann's Spiral of Silence, Irving Crespi's theory of the Public Opinion Process and Giovanni Sartori's "cascade model" of public opinion. Key words: public opinion, media, Two-step flow model, Spiral of Silence, Public Opinion Process, cascade model of public opinion, Alexis de Tocqeuville, John Stuart Mill, James Bryce, W. Lippmann, E. Katz, P. Lazarsfeld, E. Noelle-Neumann, I. Crespi, G. Sartori

Flow separation and reattachment happens in many fluid mechanical situations occurring in engineering applications as well as in nature. The flow over a backward-facing step represents a geometrically simple flow situation exhibiting both flow separation and reattachment. Broadly speaking there are only two important parameters in the problem, the Reynolds number(Re) based on the step height(h),and a geometrical parameter, referred to as the Expansion ratio(ER), defined as the downstream channel height to the upstream channel height. In spite of the relative simplicity of this geometry, the flow downstream is quite complex. The main focus of the present work is to elucidate the unsteady three-dimensional coherent structures present in this flow at large Re, Re>36,000,based on the step height(h). For this, we use velocity field measurements from Particle Image Velocimetry (PIV)in conjunction with hotwire anemometry measurements. The time-averaged structure of this flow is first studied in detail, including the effect of Reynolds number(Re) and Expansion Ratio(ER), on it. These studies show that at sufficiently large Re (Re>20,000), the reattachment length becomes independent of Re. The detailed internal structure of the separation bubble is also found to be independent of Re, but for Revalues that are relatively larger(Re>36,000). At large Re, the main effect of ER ,is found to be on the reattachment length, which increases with ER and saturates for ER values greater than about 1.8. The detailed internal structure of the separation bubble has been mapped at high Re and is found to be nearly the same for all ER, when the streamwise length is normalized by the reattachment length. In order to elucidate the unsteady coherent vortical structures, PIV measurements are done in two orthogonal planes downstream of the backward-facing step. These measurements are done for ER= 1.50 at large Re(Re=36,000) and in a large aspect ratio facility(AR= span length/step height= 24); the latter being important to avoid any effects due to span-wise confinement. In the spanwise plane parallel to the lower wall(x-z plane),instantaneous velocity fields show counter rotating vortex pairs, which is a signature of the three-dimensional vortical structures in this plane. Using conditional averaging, this counter-rotating vortex pair signature is captured right from upstream of the step, to well after reattachment. Spatial correlations are used to get the length scale of these coherent vortical structures, which varies substantially from the attached boundary layer before separation to the region after reattachment. The variation of these structures in the cross-stream (vertical) direction at reattachment and beyond gives an idea about their three dimensional shape. The circulation of these counter-rotating pairs is measured from the conditionally aver-aged fields, and is found to increase with streamwise distance reaching normalized circulation values (Γ/Uoh) of about 0.5 around reattachment. Velocity spectra downstream of the step show peaks corresponding to both the shear layer frequency(Stsl)and a relatively lower frequency that corresponds to large-scale shedding from the separation bubble (Stb); the latter in particular being quasi-periodic. Small amplitude sinusoidal forcing at the shedding frequency(Stb) is applied close to the step, by blowing and suction, to make the quasi-periodic shedding more regular. Measurements show that this has a very small effect on both the mean separation bubble and on the counter-rotating structures in the x-z plane. This mild forcing however enables phase locked PIV measurements to be made which shows the bubble shedding phenomenon in the cross-stream plane(side view or x-y plane). The phase-averaged velocity fields show significant variations from phase to phase. Although there is some hint of structures being shed, from these phase-averaged fields, it is not very clear. One of the primary reasons is the fact that the flow is effectively spanwise averaged, as the three-dimensional structures are not locked in the spanwise direction. To get a three dimensional view of the sheddin gphenomenon, it is necessary to lock the spanwise location with respect to the three-dimensional vortical structures before averaging across the different phases. We use the condition, u’<- urms, to locate the central plane between the counter-rotating structures, which in effect are the “legs” of the three-dimensional structure. With this condition, we effectively get a slice of the shedding cycle cutting through the “head” of the three-dimensional structure. Apart from this cut, we also get a cut between adjacent structures from the weak sweep events, with the condition u’<- urms. Using these conditions, on the phase-locked velocity fields, we effectively lock the structures in time, as well as in the spanwise direction. With this ,a clearer picture of the shedding process emerges. The flow is highly three-dimensional near reattachment and the shedding of the separation bubble is modulated in the spanwise direction owing to the three-dimensional hairpin like vortical structures in the flow. The separation bubble is seen bulged out and lifted high at locations where the head of the hairpin vortex passes, owing to the strong ejection of fluid caused by the vortical structure. On the other hand, outside the hairpin vortices, weak sweep events push the flow towards the wall and make it shallow and less prominent, with the shedding being very weak in this plane. From these observations, a three-dimensional picture of the flow is proposed.

Listan över influerare som har gjort skönhetsingrepp kan göras lång. För att nämna ett exempel har Bianca Ingrosso med ett följarantal på 343 000 på Youtube talat öppet om att hon gjort lipfillers (Ingrosso, 2020). Dessa inlägg där influerare talar om hur de korrigerar sin kropp i kombination med att de unga är i majoritet på internet och sociala medier (Svenskarna och internet 2019) ligger till grund för vår vilja att genomföra denna undersökning. Syftet med denna studie är att undersöka hur influerares reklam och framställning av skönhetsingrepp kan skapa betydelse för hur unga kvinnor ser på den egna kroppen. För att genomföra studien har vi använt oss av sex stycken kvalitativa intervjuer med kvinnor i åldrarna 15–17 år. Intervjuerna har spelats in och transkriberats och materialet har sedan analyserats för att besvara våra frågeställningar. Utifrån våra intervjuer kan vi se att influerares sätt att tala om och göra reklam för skönhetsingrepp har betydelse för unga kvinnors attityder till den egna kroppen. Några av respondenterna har även uttryckt att de blivit osäkra gällande sin egen kropp efter att ha sett inlägg gällande skönhetsingrepp från en influerare. Vi kan tydligt se att respondenterna tror att unga kvinnor är den grupp som påverkas mest av influerares framställning av skönhetsingrepp. Intervjuerna visar att respondenterna tar del av ett dominerande skönhetsideal på sociala medier och de beskriver idealet som att man ska vara smal, lång och vacker. Vi kan tydligt se, genom de analyserade intervjuerna, att de unga kvinnorna som deltog i denna studie är kritiska till influerare som talar om och gör reklam för skönhetsingrepp, då de tycker att det uppmanar andra till att korrigera sin kropp. Trots kritiken så spelar influerare en stor roll i de unga kvinnornas liv och de uttrycker att de får inspiration av influerare gällande var och vad man äter, hur man klär sig och hur man tränar. Vi kan därmed se en viss ambivalens i respondenternas svar då de följer specifika influerare samtidigt som de riktar kritik gentemot dessa. / The list of influencers who has had cosmetic procedures done can be made long. To mention one example, Bianca Ingrosso with 343 000 followers on Youtube, has spoken openly about her lip fillers (Ingrosso 2020). These types of posts, where influencers talk about how they correct their body, in combination with the fact that young people are a majority of the internet and social media users (Svenskarna och internet 2019) forms the basis of our motivation to conduct this study. This study aims to analyze whether, and if so, how influencers advertising and speech about cosmetic procedures contribute in creating meaning regarding how young women view their own body. This study was conducted with six qualitative interviews, with women in age 15-17. The interviews have been recorded and transcribed and the material has been analyzed to answer our research questions. Throughout our analyzed interviews can we see that influencers' speech and advertising about cosmetic procedures are meaningful regarding young women's attitudes to their own body. Some of the respondents expressed that they felt insecure about their own body after seeing an influencer talk about cosmetic procedures. We can also see that the respondents think that young women as a group of people are affected by influencers' opinions about cosmetic procedures. In the interviews, we can also see that the respondents take part in constructing a dominating beauty ideal on social media and they define the ideal as being skinny, tall and beautiful. Clearly the young women who took part in this study are critical of how influencers talk and do commercials about cosmetic procedures, they think influencers tell others to correct their body. Despite the criticism, the young women in this study are still inspired by influencers, regarding where and what they eat, how they dress and how they work out. We can clearly see some ambivalence in the way the respondents answer as they follow specific influencers while they also are criticizing them.