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...simple polymers like polyethylene as well as entirely new stereoregular polymers like polypropylene. That progress has continued at an increasing rate up to the present. Novel polymers, like aromatic polyamides and polyimides which were discovered only in the 1960s, have been developed, while speciality, high temperature materials like polysulphones have penetrated new...

...simple zoom slider control, which magnifies the area around the cross-hairs. The slider dot can be dragged or, alternatively, you can click to the right or left of the zoom dot to zoom in and out of the specimen. If you wish to zoom into another area, simply drag the image, so that the area is located on the cross-hairs, then zoom in. The five millimetre scale bar at the...

...simple design jobs such as planning and redecorating a bedroom. When the task concerns the design of a new building, aeroplane, car, or even modest consumer products such as an electric iron, then the process of seeking compromise calls for a wide range of skills, knowledge, abilities and sensitivities. Design problems usually have many, many possible solutions. One of...