Screw misfit dislocations perpendicular to one or two free surfaces

ABSTRACT

When a screw dislocation pierces one or two free surface(s), noticeable elastic relaxation takes place nearby these surfaces. To refine the theoretical interpretation of an electron microscopy image this relaxation should be included in a precise imaging model. In the present work, the relaxation field is evaluated for a periodic set of misfit screw dislocations normal to the free surface of a semi-infinite or plate-like heterogeneous bicrystal. The proposed approach uses an appropriate combination of known biperiodic elastic fields. For a homogeneous medium and when the period increases, the results around a misfit screw dislocation converge to those of Eshelby and Stroh (1951) who considered an isolated translation screw dislocation.     

Politics on the move: The democratic control of the design of sustainable technologies

This article examines how “design rationality” could help remediate the controversy over environmental degradation. Drawing on the case of designing sustainable forms of traffic management, it argues that this will only be effective to a limited degree. “Policy conversation” does indeed take place but within a coalition of actions that pushes a particular set of solutions. This facilitates due procedure but erodes political legitimacy, thus potentially reproducing an intractable controversy. The article suggests a five-phase model of democratic control as an alternative. He primarily works in the field of sociology of technology and environment. He is presently involved in a research project on the social redefinition of mobility, analyzing the translation of sustainable development into new institutional arrangements.     

Information Privacy for Technology Users With Intellectual and Developmental Disabilities: Why Does It Matter?

This article aims to explore the attitudes and behaviors of persons with intellectual and developmental disabilities (IDD) related to their information privacy when using information technology (IT). Six persons with IDD were recruited to participate to a series of 3 semistructured focus groups. Data were analyzed following a hybrid thematic analysis approach. Only 2 participants reported using IT every day. However, they all perceived IT use benefits, such as an increased autonomy. Participants demonstrated awareness of privacy concerns, but not in situations involving the use of technology; their awareness is not transferred to the abstract context of IT use. Privacy breaches were revealed to be a major risk for persons with IDD, who did not seem to understand how their personal information was used. Most protection mechanisms and tools reported were those suggested and implemented by caregivers and close relatives who had a great influence on the participants’ attitudes and behaviors toward IT and privacy. Our findings suggest that when using IT, persons with IDD often experience the consequences of a trade-off between autonomy and privacy. Further research and action is needed to support persons with IDD to understand and balance the benefits of IT use and the inherent threats to information privacy.