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Université de Fribourg

Structural diversity with varying disorder enables the multicolored display in the longhorn beetle Sulawesiella rafaelae

Bermúdez-Ureña, Esteban ; Kilchoer, Cédric ; Lord, Nathan P. ; Steiner, Ullrich ; Wilts, Bodo

In: iScience, 2020, vol. 23, no. 7, p. -

Light control through layered photonic nanostructures enables the strikingly colored displays of many beetles, birds, and butterflies. To achieve different reflected colors, natural organisms mainly rely on refractive index variations or scaling of a fixed structure design, as opposed to varying the type of structure. Here, we describe the presence of distinct coloration mechanisms in the...

Université de Fribourg

Relationship Processes in Understudied Samples : Implications for Relationship Functioning and Sexuality in Romantic Relationships

Uhlich, Maximiliane ; Schoebi, Dominik (Dir.)

Thèse de doctorat : Université de Fribourg, 2020.

Relationship functioning can be investigated from different angles; next to investigating dyadic outcomes between couples we can also zoom into processes within subjects. Adopting a cultural lens adds another layer, as the cultural context influences norms around intimate relationships, and can be inspected using the framework of Bronfenbrenner´s (1977) ecological systems theory. In more...

Haute Ecole pédagogique Fribourg

Corporate Cosmopolitanism: Making an Asset of Diversity and Mobility at Swiss International Schools

Rey, Jeanne ; Bolay, Matthieu

In: ACME: An International Journal for Critical Geographies, 2020, vol. 19, no. 1, p. 106-130

This article explores the subjective spatial relations that international schools in Switzerland seek to produce within the cosmopolitan enclaves they form. Based on ethnographic fieldwork at 21 international schools in Switzerland, we scrutinize practices related to diversity and mobility, which international schools construe as the main vehicles leading to the desired attributes of...

Università della Svizzera italiana

Human-robot interaction with pointing gestures : intuitive interaction between co-located humans and robots

Gromov, Boris ; Gambardella, Luca Maria (Dir.) ; Giusti, Alessandro (Codir.)

Thèse de doctorat : Università della Svizzera italiana, 2020 ; 2020INFO004.

Human-robot interaction (HRI) is an active area of research and an essential component for the effective integration of mobile robots in everyday environments. In this PhD work, we studied, designed, implemented, and experimentally validated new efficient interaction modalities between humans and robots that share the same workspace. The core of the work revolves around deictic (pointing)...

Université de Fribourg

Polymerization‐induced wrinkled surfaces with controlled topography as slippery surfaces for colorado potato beetles

Bergmann, Johannes B. ; Moatsou, Dafni ; Surapaneni, Venkata A. ; Thielen, Marc ; Speck, Thomas ; Wilts, Bodo D. ; Steiner, Ullrich

In: Advanced Materials Interfaces, 2020, p. 2000129

Controlling the interaction of insect populations with their host plants has recently received renewed attention in the light of pest control. One way to modify the interaction of insects with their host plants in a non‐chemical way is through influence of their de/attachment. Insect detachment has been observed for textured biological and structured artificial surfaces with morphologies ...

Université de Fribourg

Colloidal transformations in ms2 virus particles: driven by ph, influenced by natural organic matter

Watts, Samuel ; Julian, Timothy R. ; Maniura-Weber, Katharina ; Graule, Thomas ; Salentinig, Stefan

In: ACS Nano, 2020, vol. 14, no. 2, p. 1879–1887

Enteric viruses, such as enterovirus, norovirus, and rotavirus, are among the leading causes of disease outbreaks due to contaminated drinking and recreational water. Viruses are difficult to remove from water through filtration based on physical size exclusion—for example by gravity-driven filters—due to their nanoscale size. To understand virus removal in drinking water treatment ...

Università della Svizzera italiana

Labour market outcomes : Careers, transitions and durations

Malfitano, Paolo ; Maggi, Rico (Dir.)

Thèse de doctorat : Università della Svizzera italiana, 2020 ; 2020ECO004.

This thesis contributes to labour economics by considering a wide range of factors influencing career paths, transitions to self- employment and duration in entrepreneurship. In the past literature, several studies have analysed labour market outcomes, transitions and durations. Nevertheless, there is the need of knowing more about the influence of individual and background characteristics on...

Università della Svizzera italiana

The digital birth of an African city : the case of Douala

Pucciarelli, Marta ; Cantoni, Lorenzo (Dir.)

Thèse de doctorat : Università della Svizzera italiana, 2019 ; 2019COM003.

This dissertation focuses on the online communication and representation of a digital city in Africa: Douala, the largest city of the Republic of Cameroon. In particular, it explores the evolution of the web-based reproduction (Couclelis, 2004) of Douala, the largest city of the Republic of Cameroon, from a chronological, spatial and representational perspective, with the purpose of...

Université de Fribourg

Light-induced evaporative cooling of holes in the Hubbard model

Werner, Philipp ; Eckstein, Martin ; Müller, Markus ; Refael, Gil

In: Nature Communications, 2019, vol. 10, no. 1, p. 5556

An elusive goal in the field of driven quantum matter is the induction of long-range order. Here, we propose a mechanism based on light-induced evaporative cooling of holes in a correlated fermionic system. Since the entropy of a filled narrow band grows rapidly with hole doping, the isentropic transfer of holes from a doped Mott insulator to such a band results in a drop of temperature....

Université de Neuchâtel

Compact laser sources from the extreme ultraviolet to the mid-infrared spectral range

Merceron, Loïc P. J. M. ; Südmeyer, Thomas (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2019.

Lasers have revolutionized the way we live and work in so many ways and have become a major part of our lives. We use them in telecommunications, medical care, material processing, data storage and printing, just to name a few. Lasers have proved to be important tools and are a major subject of research in science, continuously developed further and finding new uses. Pushed by the need to...