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...resources and qualifications by visiting The Open University – www.open.edu/ openlearn/ free-courses...Session 3: We are causing change: Introduction - If the planet is changing, how do scientists know how much of the change is down to us? This session, you will examine IPCC assessments of the human contribution to climate change. You will continue to consider why...

...opened and component removed. [Diagram to demonstrate Melt Casting (see article)] Manufacture: Only requires melt extruder and mould. Screw-type extruder must be capable of delivering homogeneous melt, at sufficient speed, to fill mould cavity before freeze-off. Mould fills under low pressure, so can be soft steel or aluminium. Backing plates on the mould are unnecessary...

...opening in the base of the die. In cold extrusion, metal powder is compressed directly into the die, causing sections of metal to extrude from the small hole in the die base...The cold extrusion of metal powder [Diagram to demonstrate the 'Extrusion of powders' - see article ] The hot extrusion of a "canned" refractory metal powder [Diagram to demonstrate the 'Extrusion...

...Open University PhD student Sarah Needs explains:...Sugars and Proteins Sugar and proteins in the context of the cell are very different to the sugar and proteins we think of as being in our diet. The body is made up of cells and in these cells are many different proteins. These proteins are essentially the workhorses of the cell that regulate and control the body's...