795 search results
The science behind sunblocks, tanning and sunburn
Science, Maths & Technology

The science behind sunblocks, tanning and sunburn

...oxide. A sunscreen contains chemicals that absorb the energy contained in the ultraviolet rays and reflect it away as lower-energy long-wave radiation, which is emitted as heat. [sun block versus sunscreen] Final thoughts A good way to limit exposure to UV light is to avoid being outdoors in sunlight too long. UV rays are most intense between the hours of 10 am and 4 pm....
View article The science behind sunblocks, tanning and sunburn
Article 10 mins
Women in engineering - interview with Robyn Moates
Science, Maths & Technology

Women in engineering - interview with Robyn Moates

...Energy Options (geo), and talked to us about her life as an engineer. You may also be interested in the Open University course Engineering: professions, practice and skills. The best thing about being an engineer Transcript. I never feel alone as an engineer. No matter what’s happening, something, you need something done, it will get done. And it will get done by...
View video Women in engineering - interview with Robyn Moates
Video 10 mins
Laser beam welding
Science, Maths & Technology

Laser beam welding

...energy laser beam directed at the joint to be welded. The surfaces of the workpiece melt, bonding the two parts together. Results in a narrow weld zone and HAZ. Combining laser and gas tungsten arc (GTA) welding can produce deeper weld penetration...[Images to demonstrate 'Laser beam welding' - see article ] A high energy laser beam is focused onto the surface to be...
View article Laser beam welding
Article 10 mins
Ion implantation
Science, Maths & Technology

Ion implantation

...energy stream of ions that penetrate the surface. This is not a diffusion process. Once impregnated into the surface, the ions (usually carbon or nitrogen) lose their energy and stop moving. The compressive stresses generated in the surface layers improve mechanical and fatigue properties, as well as corrosion and wear resistance...[Images to demonstrate 'Ion...
View article Ion implantation
Article 10 mins
What is polonium - and why is it so dangerous?
Science, Maths & Technology

What is polonium - and why is it so dangerous?

...energy) of alpha particles produced by radiation is specific to the isotope that emits them and leaves a kind of signature, with which the original isotope can be identified. A sample of fluid suspected of containing polonium is dried onto a surface and the energy of the emitted particles is measured. The number of particles with a particular energy is directly...
View article What is polonium - and why is it so dangerous?
Article 5 mins
Why the size of your plate might be making you overweight
Health, Sports & Psychology

Why the size of your plate might be making you overweight

...energy intake by up to 16% among UK adults or 29% among US adults. [Woman drinking from a double-sized cup] The Double-Sized Big Gulp cup was a marketing gimmick - but could large-sized cups, plates and packages be encouraging us to over-eat? Overeating increases the risks of heart disease, diabetes, and many cancers, which are among the leading causes of ill health and...
View article Why the size of your plate might be making you overweight
Article 5 mins
Leaving no stone unturned in the pursuit of female athletic performance
Health, Sports & Psychology

Leaving no stone unturned in the pursuit of female athletic performance

...energy. A lead car shone a laser onto the road to pinpoint the shortest route, ensuring Kipchoge didn’t run a step too far. A cyclist rode alongside him to pass specially formulated sports drink to ensure he didn’t become depleted of energy or dehydrated. And that’s only some of the science that supported this incredible feat. The ‘default male’ in sports...
View article Leaving no stone unturned in the pursuit of female athletic performance
Article 15 mins
What is a scientific model?
Science, Maths & Technology

What is a scientific model?

...solar system move, then you would need to put in a mathematical description of gravity, and then you could set your solar system going and watch things moving. And you wouldn’t need to describe all of the autonomic physics that gives you the structure of each individual planet. For your model of the solar system you could have a rather simple description of gravity, and...
View audio What is a scientific model?
Audio 5 mins