419 search results
Reaction injection moulding (RIM) and Reinforced reaction injection moulding (RRIM)
Science, Maths & Technology

Reaction injection moulding (RIM) and Reinforced reaction injection moulding (RRIM)

...carbon, and polypropylene are currently under investigation. Material properties of RRIM systems: Property Urethane, high modulus Nylon 6 Epoxy Glass content (%) 23* 25* 45 - 52† Tensile strength (MPa) 45 52 193 - 303 Elongation (%) 14 13 – Flexural modulus at 24˚C (MPa) 2620 1896 17,927 - 25,511 Coefficient of linear thermal expansion (parallel to fibres) (× 10-6...
View article Reaction injection moulding (RIM) and Reinforced reaction injection moulding (RRIM)
Article 5 mins
Hot forging (closed die)
Science, Maths & Technology

Hot forging (closed die)

...Carbon and alloy steels 760 - 1200 Stainless steels 930 - 1180 Nickel alloys 750 - 1125 Titanium alloys 825 - 900 Niobium alloys 1050 - 1250 Molybdenum alloys 1050 - 1350 Tungsten and its alloys 1200 - 1500 Large quantities of low-alloy steels of the Ni-Cr and Ni-Cr-Mo types are used for highly stressed parts such as axle shafts and other automobile parts. Wrought...
View article Hot forging (closed die)
Article 5 mins
Ceres: Is it an asteroid? Is it a comet? Erm...
Science, Maths & Technology

Ceres: Is it an asteroid? Is it a comet? Erm...

...carbonate. The clay minerals could have been produced by silicates reacting with ammonia ice. However, if Ceres had formed where it is now, it would not have been able to pick up any ammonia ice to enable such a reaction, because the ice would not be stable. This means that Ceres may have originally formed in the Kuiper Belt on the outskirts of the solar system and then...
View article Ceres: Is it an asteroid? Is it a comet? Erm...
Article 5 mins
Too much of a good thing? Choice challenges in sustainable clothes shopping
Money & Business

Too much of a good thing? Choice challenges in sustainable clothes shopping

...carbon; recycled), but there is little guidance to help shoppers navigate a ‘best’ purchase choice. There is not a single, international, all encompassing ‘omni-label’ that covers everything, so – is it better to choose recycled materials or support fair wages when buying that T-shirt? H&M offer organic leather, hemp, silk, cotton and linen but also garments...
View article Too much of a good thing? Choice challenges in sustainable clothes shopping
Article 5 mins
Speed of Arctic changes defies scientists
Nature & Environment

Speed of Arctic changes defies scientists

...carbon dioxide and methane. The WMO secretary-general, Petteri Taalas, said the Arctic changes had also been a factor in unusual winter weather patterns in North America and Europe. He said the thawing of the permafrost could release vast quantities of greenhouse gases into the atmosphere. “These are part of the vicious circles of climate change which are the subject of...
View article Speed of Arctic changes defies scientists
Article 10 mins
Understanding water quality
Nature & Environment

Understanding water quality

...carbon dioxide. Natural rainwater is slightly acidic as a result of this reaction, with an average pH of 5.7, whereas the average pH of seawater is 8.2 (Box 1). Rainwater may be even more acidic in areas where the highly soluble acidic gases sulphur dioxide and nitrogen dioxide (both produced by fossil fuel power generation, transportation and industrial processes) are...
View course Understanding water quality
Level 2: Intermediate 10 hrs
White dwarfs and neutron stars
Science, Maths & Technology

White dwarfs and neutron stars

...carbon and oxygen in the star’s core, again releasing energy. Low mass stars (< 3 M☉) and intermediate mass stars (in the range 3–8 M☉) ultimately begin a second ascent of the red giant branch (known as the asymptotic giant branch, or AGB) when core helium is exhausted and helium fusion only continues in a shell surrounding an inert carbon/oxygen core. Massive...
View course White dwarfs and neutron stars
Level 3: Advanced 6 hrs
Icy bodies: Europa and elsewhere
Science, Maths & Technology

Icy bodies: Europa and elsewhere

...carbon-rich) material erupted from geysers. The rugged surface beyond the polar cap is methane-rich ice, contaminated by nitrogen, carbon dioxide, carbon monoxide and water. (NASA) Beyond its large satellites each giant planet has a second collection of small irregular-shaped satellites, travelling in elongated, inclined and in many cases retrograde orbits. Most are dark...
View course Icy bodies: Europa and elsewhere
Level 2: Intermediate 17 hrs