414 search results
Manual metal arc welding (MMA)
Science, Maths & Technology

Manual metal arc welding (MMA)

...carbonate (CaCO3) – decomposes to form CaO, and hence a basic slag. Calcium fluoride (CaF2)– increases slag fluidity. Sodium oxide (Na2O) – acts as a coating binder and promotes slag fluidity. Ferro-silicon – acts as deoxidant. Iron powder – increases the rate of deposition. Sizes of welding machines are designated according to their output rating, which may...
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Article 10 mins
Warm forging
Science, Maths & Technology

Warm forging

...carbon case hardening steels to medium carbon (0.4–0.5% C) steels for induction hardening applications). Cr-Ni-V steels are used to produce socket heads for socket sets. Only a slight improvement in material properties compared with cold forging. Design: Dimension and tolerance control is not as good as for cold forging. Tolerances: diameter 0.3–0.6 mm length...
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Article 5 mins
Ecosystems: living communities
Science, Maths & Technology

Ecosystems: living communities

...the role of the sun, carbon, and energy interactions between organisms in ecosystems Humans enter the equation How human activity affects the delicate energy balance in an ecosystem with often adverse consequences Managing or meddling? How ecosystems need careful understanding if we are to sustain them for the future whilst using them to our economic advantage...
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Audio 18 mins
Climate change – How awareness is prevented through media sanitation
Nature & Environment

Climate change – How awareness is prevented through media sanitation

...carbon dioxide. The loss of this carbon sink adds to the increasing carbon emissions that lead to climate change. Palm oil is also an issue of social justice affecting the livelihoods of local indigenous people, and their cultures that are destroyed through deforestation. When they protest against the continued practice of unsustainable farming, they are thrown in jail...
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Article 10 mins
How Volkswagen got caught cheating emissions tests by a clean air NGO
Science, Maths & Technology

How Volkswagen got caught cheating emissions tests by a clean air NGO

...carbon alternatives such as electric and hybrid-electric vehicles increasingly available, as well as, more recently, the first commercial fuel-cell cars, the need for diesel as a carbon reduction technology is becoming less central. Unanswered questions For VW itself, apart from the massive loss of share value in recent days, its corporate social and environmental...
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Article 10 mins
Professor Andrew Watson - Stories of Change
Nature & Environment

Professor Andrew Watson - Stories of Change

...carbon dioxide and other greenhouse gases, chlorofluorocarbons and other ocean tracers. Andy was made a Fellow of the Royal Society in 2003. He is a recipient of the European Geophysical Union’s Nansen Medal for contributions to marine science (2003), and the Plymouth Marine Sciences medal (2009). Since 2009 he has been funded as a Royal Society Research Professor. He...
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Audio 5 mins
Why is Enceladus a possible home for life - and should we visit to find out?
Science, Maths & Technology

Why is Enceladus a possible home for life - and should we visit to find out?

...carbon monoxide, carbon dioxide, simple organic molecules and salts. [Enceladus cutaway, as described in the text] Cutaway view inside Enceladus, showing where hot water and rock interact below the ice Eventually, in March 2015, it detected microscopic particles of silica. By then, the composition of the plumes showed almost every sign that ocean water had reacted...
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Video 5 mins
Phosphating (non-electrolytic coatings)
Science, Maths & Technology

Phosphating (non-electrolytic coatings)

...carbon content of the steel (the higher the carbon content, the darker the coating). Used as lubricant. Iron phosphates are chiefly used as a base for subsequent painting, and have excellent adhesion. Manganese phosphates are used on ferrous parts such as internal combustion (IC) engine components, for breaking in and to prevent galling. They are usually brown-black or...
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Article 10 mins