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Language and thought: introducing representation
History & The Arts

Language and thought: introducing representation

...think it means, whatever that might be, or does what you say carry its own meaning, separate from your intentions in saying it? This free course, Language and thought: introducing representation, introduces you to the key questions about how meaning is conveyed in language...How does what you say come to mean something? Does what you say inherently represent what you, the...
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Level 3: Advanced 20 hrs
How can mobile technology help underpin reproductive rights?
Health, Sports & Psychology

How can mobile technology help underpin reproductive rights?

...systems. Babatunde Osotimehin, executive director and under-secretary-general of the United Nations, tells SciDev.Net that governments and all partners in reproductive health need to provide information and access to voluntary family planning to all people of reproductive age. “These will enable both women and men to make informed decisions about their reproductive...
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Article 5 mins
CLA – Hitchiner process
Science, Maths & Technology

CLA – Hitchiner process

...systems, these include: aluminium-based alloys nickel-based alloys stainless steels cobalt-based alloy for surgical implants. The CLV process is used for vacuum cast alloys, to reduce contamination by reactive elements such as nickel-, cobalt- and titanium-based alloys. Design: Gates (6–12 mm in length) are removed at a rate of 600 per hour to an accuracy of ±0.012 mm....
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Article 5 mins
Hot isostatic pressing (HIP)
Science, Maths & Technology

Hot isostatic pressing (HIP)

...systems will make process economical for a wider range of components. Pressures vary from 50 to 200 MPa, and temperatures up to 2000˚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,...
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Article 5 mins
Cold isostatic pressing
Science, Maths & Technology

Cold isostatic pressing

...system. Depending on the size of the chamber, several bags can be loaded into the space available. This is a batch process and compaction cycle time varies between 2 and 5 min. Dry-bag technique. Flexible bag is “fixed” in the pressure vessel and powder is loaded into the bag(s) without the bag having to leave the pressure vessel. The dry-bag technique lends itself to...
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Article 5 mins
How lenses and mirrors work
Health, Sports & Psychology

How lenses and mirrors work

...systems. Converging (convex) lenses and converging (concave) mirrors each cause parallel rays of light to come together at the focal point, or focus, of the lens or mirror as shown below. In contrast, diverging (concave) lenses and diverging (convex) mirrors each cause parallel rays of light to spread out as if emanating from the focal point situated at a distance of one...
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Article 5 mins
Marketing food to children and young people: Why it matters even more in the digital age
Education & Development

Marketing food to children and young people: Why it matters even more in the digital age

...systems; and urban planning and deprivation that doesn’t support physical activity or healthy food supply. In addition to all these – and interacting with them – is the promotion (marketing and advertising) of unhealthy foods in the media and elsewhere, which has been shown to increase children’s eating. From their earliest days, children recognise more unhealthy...
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Article 10 mins
The Great Fall: A personal perspective, before and after
Languages

The Great Fall: A personal perspective, before and after

...systemic flaws and distortions had been serious, Walter grimly predicted huge losses in East Germany’s progressive social programmes now the Wall was down. As we walked around what was East Berlin Walter, then in his 83rd year, talked about the need for a radical rethink of socialist strategies, so our children and grandchildren would grow up in a better world. Those of...
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Article 5 mins