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Mayer reviews HANDLE WITH CARE: Ownership and Control of Ethnographic Materials by Sjoerd R. Jaarsma.

International audience ; Today's electronics packages are smaller and more powerful than ever before. This leads to ever increasing thermal challenges for the systems designer. The automotive electronic control unit (ECU) package faces the same challenge of thermal management as the industry in general. This is coupled with the latest European Union legislation (Euro 6 standard) which forced the ECU manufacturers to completely re-design their ECU platform with improved hardware and software capability. This will result in increased power densities and therefore, the ability to dissipate heat will be a key factor. A higher thermal conductivity (TC) material for the ECU housing (than the currently used Aluminium) could improve heat dissipation from the ECU. This paper critically reviews the state-of-the-art in thermal management materials which may be applicable to an automotive ECU. This review shows that of the different materials currently available, the Al/SiC composites in particular have very good potential for automotive ECU application. In terms of metal composites processing, the liquid metal infiltration process is recommended as it has a lower processing cost and it also has the ability to produce near net-shape materials.

Computer simulation is a tool of multiple uses. One is the ability to dynamically model theories and discover unexpected interactions and outcomes. A propositional theory of organizational control, based on the work of Collins (1975, 1988), is modeled and simulated here. The verbal theory synthesizes other theories to explain how formal organizations attain and maintain compliance from members. The modeling and simulation of Collins' theory discovers a number of interesting and informative, but unexpected, outcomes. While the control processes of organizations do produce stable compliance, this compliance is punctuated by episodic periods of noncompliance that increase in frequency and duration over time, resulting ultimately in the breakdown of the control process.