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...solar system, and how it can be modelled mathematically appreciate the difficulties inherent in predicting chaotic systems, like weather forecasting. The Open University would really appreciate a few minutes of your time to tell us about yourself and your expectations for the course before you begin, in our optional start-of-course survey. Participation will be completely...

...Energies of approximately 10kWh m-3 and thermal efficiencies of 85–90% can be achieved. There are three commonly used plasma systems. Manufacture An alternative to flame cutting, laser cutting, electrical discharge wire cutting and abrasive jet cutting. Used mainly for profile cutting of metal sheets and slabs up to 200 mm thick, but can also be used for cutting,...

...energy. An electrolyte medium separates the tool (cathode) from the electrically conductive metal workpiece (anode), creating an electrolytic cell. A high amperage, low voltage current is passed through the cell, selectively dissolving away the material to be removed. Produces distortionless, burr-free components with an excellent surface finish in hard,

...energy into electricity. New Designs: Postmobile Design for a specific market: a new designer explains how he secured sponsorship from the Royal Mail to develop his prototype. New Designs: Pushchair Redesigning and problem solving: a new designer describes her journey from concept to prototype. New Designs: Scooter Designing for the environment: a new designer tests his...