Space debris is a rising concern for the sustained operation of our satellites. The population in space is continually growing, both gradually with a steady stream of new launches, and in sudden bursts, as evidenced with the recent collision between the Iridium and inactive COSMOS spacecraft. The problem is most severe in densely populated orbit regimes, where satellites face a sustained presen...

The Autonomous Formation Flight (AFF) project at the NASA Dryden Flight Research Center (Edwards, California) investigated performance benefits resulting from formation flight, such as reduced aerodynamic drag and fuel consumption. To obtain data on performance benefits, a trailing F/A-18 airplane flew within the wingtip-shed vortex of a leading F/A-18 airplane. The pilot of the trail airplane ...

Recommender systems have become widely used for providing personalized product, media and travel information. Our goal is to apply them in automotive scenarios by recommending Points-Of-Interest (POI) such as fuel stations, restaurants or parking places. Furthermore, driver distraction caused by user interaction is a problem in automotive scenarios. We aim to reduce interaction by providing rec...

The cover shows the sun over a nuclear power station. Tritium is generated by nuclear fusion reactions in the sun and would be generated in terrestrial nuclear fusion power production. It is also produced as part of the fuel cycle in current nuclear fi ssion power production and has several uses in industry.

One of the issues that need to be addressed in order to improve the durability and efficiency of a PEM fuel cell system is the management of the hydrogen feeding procedure. It has been demonstrated these aspects are improved when a hydrogen recirculation systems are used [1]. In this work, an ejector has been designed and manufactured and implemented in an experimental PEM fuel cell Test Statio...