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For graphene to be a viable platform for nanoscale devices, high quality growth and structures are necessary. This means structuring the SiC surface to prevent graphene from having to be patterned using standard microelectronic processes. Presented in this thesis are new processes aimed at improving the graphene as well as devices based on high quality graphene nanoribbons. Amorphous carbon (aC) corrals deposited prior to graphene growth are demonstrated to control SiC step-flow. SiC steps are shown to be aligned by the presence of the corrals and can increase SiC terrace widths. aC contacts deposited and crystallized during graphene growth are shown as a way to contact graphene without metal lift-off. Observation of the Quantum Hall Effect demonstrates the high quality of the graphene grown alongside the nanocrystalline graphite contacts. Continuing the ballistic transport measurements on sidewall graphene nanoribbons, the invasive probe effect is observed using an atomic force microscope (AFM) based technique that spatially maps the invasive probe effect. Cleaning experiments demonstrate the role of scattering due to resist residues and environmental adsorbates on graphene nanoribbons. Finally, switches based on junctions formed in the graphene nanoribbons are shown as a route toward graphene based devices.

Master of Science / Department of Journalism and Mass Communications / Louise Benjamin / In 2013, creating a 57-second video can lead to more than $150,000 in profit for the creator and the creator can be anyone. This money-making opportunity comes from a recent popular trend known as a “viral video,” defined as a phenomenon of a video becoming highly popular through rapid, user-led distribution via the internet. However, research has not determined a clear model for creating a non-professional viral video. Interviews and YouTube analytics revealed how the video “I’m Farming and I Grow It,” a non-professional video created by three Kansas boys, was spread. Using the theories Uses and Gratifications and Two-Step Flow, this case study then analyzed the comments posted on the viral video and a content analysis of the comments identified the key factors mentioned by users, which contributed to the videos’ millions of views. The results conclude the key components for making a non-professional video go viral are “opinion leaders” spreading the message and video content that elicits positive feelings such as joy, humor, or praise. This study also provides a model to help a non-professional video go viral based on previous research and this case study.

In the networks of relationships that influence others behavior and attitude are called opinion leaders. The two-step flow theory suggests that information through a variety of media will receive by opinion leaders, and the opinion leaders will spread the information and have the effect to other people. Today's consumer market companies often offer a trial to the high popularity bloggers for product placement, to establish a positive attitude, good reputation, and to enhance consumers purchase behavior. The views of opinion leaders in the virtual community, either positive or negative affect, all have impact to the members of the community (Bansal & Voyer, 2000). In this study, we view the Xbox LIFE community website as a research field, and use depth interviews of qualitative research as a major research method. Through the depth interview we can know the type difference of community website members and understand how the opinion leaders in the community convey the information. In this study we found that opinion leaders¡¦high degree of participation and professional knowledge in the community played a great influence in the community. The opinion leaders¡¦ speeches and views have also become the main sources to the members of the group.This study will help enterprises to seek more marketing-effective way in use online WMO(word of mouth) in the future. From this study we can find that to operate the community website are not just set up the fan pages just because the community websites are in vogue. We must discover the key to affect the community websites¡¦ members, and create the way to bring the community members together. That is the key to promote brand and service.

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The Two-Step Flow of Communication suggests that opinion leaders have a greater impact on consumers' product choices and decisions than marketers. With the advent of the Internet and e-commerce, many consumer researchers expanded the study of opinion leadership to incorporate electronic Word-of-Mouth behavior (eWOM) into the Two-Step Flow of Communication. Yet, with the recent and increasing prominence of social media, there appears to be a gap within the opinion leadership literature. Several studies have examined how the Internet and social media empower opinion leaders to instantaneously influence large crowds with eWOM. Marginally few studies, however, have considered how the production of user-generated content (UGC) among opinion leaders can further expand their peer influence. Furthermore, emergent research illustrates that social media is transforming into an enclave for celebrity culture, wherein celebrities use social media to invoke gossip and fantasy in consumers. These technological and cultural shifts within the Internet and social media necessitate an understanding of how UGC, social media and celebrity culture fit within the Two-Step Flow of Communication. In order to address these gaps, the current study probed the relationships amongst parasocial interaction, opinion leadership and willingness to participate in UGC and eWOM. Specifically, parasocial interaction is a history of interactions between a consumer and celebrity that manifest into a fantasized, personal relationship. Relevant hypotheses were developed and used to construct a theoretical model. Data were collected from a nationally representative sample (n = 555) and a Structural Equation Model was subsequently run to test the hypotheses. The findings suggest that social values, knowledge and parasocial interaction are positively related to opinion leadership. In turn, opinion leadership is positively related to willingness to participate in UGC and eWOM. Parasocial interaction, too, is positively related to willingness to participate in UGC and eWOM. A mediation effect was supported whereby opinion leadership significantly mediates the relationship between parasocial interaction and UGC, but not eWOM. The production of UGC is shown to be dependent upon parasocial interaction and opinion leadership. Nonetheless, eWOM does not seem to necessitate opinion leadership and can be produced directly from parasocial interactions.

The subject of the submitted thesis „Low pressure water hammer“ is handling the problems of dynamic conduct of water in low pressures. In this work are developed problems of the effect of changing pressure on the speed of sound in liquid. The problem is solved in the time domain using the Lax - Wendroff method in the theoretical analysis. At the end the mathematical model solved using Lax - Wendroff method is confront with the experiment.

Micro particle image velocimetry (microPIV) is a non-intrusive tool for visualizing flow in micron-scale conduits. Using this investigative instrument, two experimental studies were performed to understand flow behaviors in microfluidic channels - a sudden expansion step flow and laminar velocity profile variation in diffusion driven mixing. First, flow in a backward facing step feature (1:5 expansion ratio) in a microchannel was taken as the subject of microPIV flow visualization. The onset and development of a recirculation flow was studied as a function of flow rate. This flow pattern was further used to investigate two major parameters affecting microPIV measurements; the depth-of-focus and recording time-intervals between images in a microPIV image pair. The onset of recirculation was initiated at flow rates that correspond to Reynolds numbers, Re > 95, which is well beyond the typical working range of microfluidic devices (Re=0.01-10). The recirculation flow has a 3D structure due to the dimensions of the microchannel and the effect of no slip condition on the walls. Ensemble cross-correlation was found not to be sensitive to variations of depth-of-focus and the output flow fields were similar as long as the overall optical focus remained within the upper and lower bounds of the microchannel. However, variations of time intervals between images in a microPIV pair, resulted in quantitatively and qualitatively different flow patterns for a given constant flow rate and depth-of-focus. In the second experiment, the effect of the laminar velocity profile and its variation on mixing phenomena at the reduced scale is studied. It is shown that the diffusive mass flux between two miscible streams, flowing in a laminar regime in a microchannel, is enhanced if the velocity at their diffusion interface is increased. Based on this idea, an in-plane passive micromixing concept is proposed and implemented in a working device (sigma micromixer). This mixer shows considerable mixing performance by periodically varying the flow velocity profile, such that the maximum of the profile coincides with the transversely progressing diffusion fronts repeatedly throughout the mixing channel. microPIV has been used to visualize the behavior of laminar flow inside the micromixer device and to confirm the periodic variation of the velocity profile through the mixing channel.

KRY is a health-related app that provides a conversation with a doctor or psychologist through an app. KRY has chosen to market themselves through influencer marketing at different platforms like for instance Youtube. When influencers market KRY they encourage their followers to pay money for something that plays an important role regarding their own health. The purpose of this thesis is to answer the questions: What communicational strategies do influencers use to market KRY through sponsored video-vlogs? And how does the brand KRY get communicated through influencer marketing in sponsored video-vlogs? The thesis is considered relevant and is contributing to existing field of research because of the fact that much of the already existing research regarding influencer marketing is examining marketing of physical products. In other words, there exists lots of research regarding influencer marketing, but not much research focusing of influencer marketing of health-related services. This is the knowledge gap that this thesis aims to fill. The method the thesis is using is a multimodal analysis in combination with a rhetorical method. The material consists of the three vlogs in collaboration with KRY on Youtube which have the most views. The result shows that influencers market KRY by focusing on the intimacy between themselves and the viewers, talking about their own experience of using KRY, using emotion-related arguments and customizing the marketing after their own brand and their specific target groups of viewers. KRY as a brand did not get communicated very clearly, but could be distinguished by the fact that the influencers showed the app in their vlogs and that the brand KRY got related to positive emotions and words by all the influencers.