In situ observation of oscillatory redox dynamics of copper

How a catalyst behaves microscopically under reaction conditions, and what kinds of active sites transiently exist on its surface, is still very much a mystery to the scientific community. Here we present an in situ study on the red-ox behaviour of copper in the model reaction of hydrogen oxidation. Direct imaging combined with on-line mass spectroscopy shows that activity emerges near a phase boundary, where complex spatio-temporal dynamics are induced by the competing action of simultaneously present oxidizing and reducing agents. Using a combination of in situ imaging with in situ X-ray absorption spectroscopy and scanning photoemission microscopy, we reveal the relation between chemical and morphological dynamics and demonstrate that a static picture of active sites is insufficient to describe catalytic function of redox-active metal catalysts. The observed oscillatory redox dynamics provide a unique insight on phase-cooperation and a convenient and general mechanism for constant re-generation of transient active sites

Developing an Interactive Case to Support Student Learning of Educational Psychology

This poster presents samples of our ongoing work developing an interactive case study for use in teaching behaviorist concepts to undergraduate Teacher Education students. During the first phase of a larger project, we created a case study that involves teacher decision-making about student actions as viewed through a behaviorist lens. We piloted the study in Summer 2014 with a graduate-level educational psychology course in order to determine the perceived value of the case as an instructional tool. During the pilot we collected feedback on the case narrative and functionality and the influence on student efficacy regarding their ability to understand and implement behaviorist principles. The pilot also allowed us to assess instrument and case design for the continuing study. We used the findings from the pilot study to revise the interactive cases and hone our data collection and analysis procedures. In Fall 2014 and Spring 2015, we continued the research by implementing the cases with undergraduate educational psychology courses. This work shares initial findings from these latest implementations

Online Content Control, Memory and Community Isolation

(EN) This chapter discusses a 2011 defamation case against a Portuguese online community and association of precarious workers (Precários Inflexíveis). The author argues that prospects for a strengthening of community cannot overlook the facts of contemporary life at the margins—connectivity without leisure, work without security, presence without sense of belonging. If community-building and identity-sharing move online to overcome these dilemmas, socio-technological systems should be revised so as to not hinder the prospects of a more open and plural public life