1,185 search results
Carbonitriding / carburising
Science, Maths & Technology

Carbonitriding / carburising

...C, although fluidised beds and reduced pressure furnaces operate up to 1050°C. The carburising atmosphere consists of natural gas or propane mixed with neutral “carrier gas”, usually a mixture of N2, CO, CO2, H2 and CH4. Carburising times vary with material, temperature and/or case thickness, but at 925°C can be as low as 2 h for a 1 mm case, or as high as 36 h for...
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Article 10 mins
Water: Managing the 1% in a climate changing world
Nature & Environment

Water: Managing the 1% in a climate changing world

...Las Vegas, and the Hoover Dam supplying 120 million people. The Oroville dam also reached dangerous highs during extreme rainfall in 2017, forcing evacuation of 180,000 people downstream. But change in understanding and managing the 1% is happening. One of the most innovative ways has been to give rivers legal status. In 2017, New Zealand recognised the Whanganui River as...
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Article 10 mins
Photochemical Machining (Photo-fabrication; Chemical milling)
Science, Maths & Technology

Photochemical Machining (Photo-fabrication; Chemical milling)

...C 20% solution of concentrated hydrochloric acid and water Copper 135°C Solutions of ferric chloride of specific gravity (SG) 1.35–1.41 Magnesium 130°C 10% solution of concentrated nitric acid and water Nickel 125°C Solutions of ferric chloride SG 1.35–1.41 or 20% concentrated nitric acid / 20% concentrated hydrochloric acid / 60% water Steels 135°C Solutions of...
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Article 5 mins
Hot isostatic pressing (HIP)
Science, Maths & Technology

Hot isostatic pressing (HIP)

...C with control to ±15˚C possible. Temperature depends on material, but should be high enough to cause diffusion-bonding and low enough to avoid any undesirable structural changes. Typical examples are Ti-6Al-4V, 900˚C; Al-7.5Si-0.5Mg, 500˚C; Fe-16.5Cr-4.5Ni-4Cu, 1200˚C. Times at temperature vary with component size, material and pressure, but are of the order of...
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Article 5 mins
Everything you need to know about snowflakes
Health, Sports & Psychology

Everything you need to know about snowflakes

...C or lower is not necessary for snow. Although the edges of a flake will begin to melt at any temperature above 0 °C, the water produced will evaporate, cooling the air around the flake. The drier the air, the longer the flake can persist. In the dry downdraught from a big cumulonimbus cloud, there may be snowflakes even when the air temperature approaches 10 °C. In the...
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Article 5 mins
Explore the baking and culture of Europe: Italy
Languages

Explore the baking and culture of Europe: Italy

...la diversità culturale e culinaria delle venti regioni. Tipica dell'Emilia Romagna è la piadina, un tipo di pane azzimo che risale ai tempi antichi e viene cotto su una piastra o testo. Alcuni dolci siciliani risalgono alla dominazione araba in Sicilia, per esempio la cassata - non è un gelato ma un dolce! La cassata è preparato con ingredienti esotici come zafferano,...
View activity Explore the baking and culture of Europe: Italy
Activity 10 mins
Soldering
Science, Maths & Technology

Soldering

...C. The molten filler metal is drawn into the weld gap by capillary attraction, eventually solidifying to form the bond. There are various ways to apply the heat...Principle of soldering and action of suitable flux Mating surfaces are degreased and pickled before soldering. Components are assembled or jigged as necessary. Surfaces to be soldered are coated with flux to...
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Article 10 mins
Climate threat as grave a risk as nuclear war - Climate News Network
Nature & Environment

Climate threat as grave a risk as nuclear war - Climate News Network

...C by 2100, anything from 3°C to 7°C may be possible. On this pathway, the chances of staying below 3°C will become “vanishingly small”, but the chances of exceeding 7°C will increase and could become more likely than not within the next century. The authors see very little chance that global sea level rise will slow down, and every chance that it will accelerate....
View article Climate threat as grave a risk as nuclear war - Climate News Network
Article 10 mins