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When should you use a stacked area chart?
Science, Maths & Technology

When should you use a stacked area chart?

...works pretty well in this case, because we have only three companies, and Green’s slope is gentle enough that it doesn’t distort our view of Blue. If, however, we had more companies to track, it’s a good bet that at least one of them would look worse than it is because of the tilted baseline problem. The solution to this problem is to avoid the sexy stacked area...
How do fire controls harm biodiversity?
Nature & Environment

How do fire controls harm biodiversity?

...this sort of vegetation,” he points out. Lucíola Lannes, also a biologist, at the engineering faculty of São Paulo State University in Brazil, says: “the work shows that carbon dioxide mitigation policies that favour fire suppressions cannot be a priority conservation policy in El Cerrado”. This article was originally published by SciDevNet under a CC-BY licence...
Week 1 Civilisations: The debate
History & The Arts

Week 1 Civilisations: The debate

...works of art, filmed in a mind-boggling range of locations, in response to Kenneth Clark's original Civilisation of 1969. Tonight's episode was presented by Simon Schama, who will host five episodes, but there will also be two each presented by Mary Beard and David Olusoga. Along the way the OU has been a partner on the program, and Gill Perry and I have been providing...
Transfer moulding
Science, Maths & Technology

Transfer moulding

...work is done on the material during the transfer process, and the heat transfer paths are shorter. This leads to faster heating, curing and cycle times than compression moulding. Materials: Materials are normally thermosetting polymers such as PF, UF, MF, epoxies and rubbers. Additives may be mixed with the base material to encourage free-flowing characteristics. Design:...
Hot rolling
Science, Maths & Technology

Hot rolling

...work metals than with cold rolling. Cast ingot structures, at heavy deformations and at temperatures where recrystallisation occurs, promote recrystallisation. Control of the sheet temperature can produce fine-grained structures. Design: Shaped rolling can be used to produce a wide variety of useful-shaped sections in continuous lengths: this includes T, L and U sections,...
Article 5 mins
Warm forging
Science, Maths & Technology

Warm forging

...work die steels are used for punches and dies. Lower forging loads are required than with cold forging, hence smaller-capacity presses can be used: e.g. maximum punch pressures for steel are: cold forging (62% reduction) 2000 MPa warm forging (62% at 600˚C) 1450 MPa Any critical dimension might need to be tightened by the addition of an extra coining or sizing operation....
Article 5 mins
Darwin in the land of pumas
History & The Arts

Darwin in the land of pumas

...work, and is generally overstated. The road was uninteresting, over a dry grassy plain; and on our left hand at a greater or less distance there were some low hills; a continuation of which we crossed close to the posta. Before our arrival we met a large herd of cattle and horses, guarded by fifteen soldiers; but we were told many had been lost. It is very difficult to...
Cell membrane: The cell's city wall
Nature & Environment

Cell membrane: The cell's city wall

...works, so in the cell, different functions are separated into different compartments. All these compartments co-exist quite happily within the outer boundary of the cell. The membranes of these internal compartments are made up of the same material as the outer membrane. VACUOLE The vacuole is found only in plant cells. In a plant cell the vacuole increases the cell...