513 search results
Electroless plating
Science, Maths & Technology

Electroless plating

...cast iron, Al, Co, stainless steels, Ti and Mg; requiring catalytic initiation – Cu, Ag and plastics. Surfaces which cannot be plated directly are Zn, Cd and Pb. Materials which can form coatings include the following: Ni-(8–12%)P Ni-B Ni-Co electroless Ni composite coatings (25–30% by volume) with coating thicknesses of 10–25 μm electroless Ni-SiC (7 µm size)...
View article Electroless plating
Article 10 mins
Introducing engineering
Science, Maths & Technology

Introducing engineering

...aluminium, and is hinged at the chainwheel bracket. This means that the chain and chainwheel are on the outside when the bicycle is folded, and the two wheels come together. In essence, Ritchie was inspired by the thought that he could do better. His two major criticisms were that the bicycle didn't fold well because the chainwheel, the dirtiest part of a bicycle, was...
View course Introducing engineering
Level 1: Introductory 15 hrs
Growing plants, growing communities: Climate Camp, Veggie Gardens and Local Politics
Society, Politics & Law

Growing plants, growing communities: Climate Camp, Veggie Gardens and Local Politics

...cast votes in a referendum and the following day, the votes cast will be reflected in the names taking up local council posts and whether the future of voting in Britain will remain the 'first past the post' system or 'AV'. But what happens when there is no vote – if an issue isn't addressed by the political parties of the day, or if the government retracts its election...
View article Growing plants, growing communities: Climate Camp, Veggie Gardens and Local Politics
Article 5 mins
Dropping the population bomb - 50 years of BBC environmental broadcasting, part two
Society, Politics & Law

Dropping the population bomb - 50 years of BBC environmental broadcasting, part two

...cast list on these topics. In this debate format review of The State of the Planet she brings some new thinking to viewers. She argues that in order to protect the environment it’s vital to support women’s rights, democracy, and grassroots knowledge and action. Maathai had already proved her point with The Greenbelt movement that she had initiated. This had got...
View article Dropping the population bomb - 50 years of BBC environmental broadcasting, part two
Article 5 mins
Glenariff to Fermanagh
OpenLearn Ireland

Glenariff to Fermanagh

...sand and pebbles and salt. All that material came from the glacier and got dumped in the lake. PAM FOGG: Well, this is an erratic, a glacial erratic boulder, and it’s called an erratic because it shouldn’t really be here. It’s on a different sort of rock. This is a limestone rock beneath us. And so it must have come from the top of the mountain because that mountain...
View video Glenariff to Fermanagh
Video 5 mins
Brass Instruments
History & The Arts

Brass Instruments

...casts new light on this complex relationship. Historical Craftsmanship Twelve men are challenged to make an authentic trumpet using techniques from before the Industrial Revolution – and they have one week to do it. Manufacture and Mass Production A process by process example of brass instrument production in a UK company Future Brass Instrument Technology A New Sound...
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Audio 1 hr 10 mins
Flame cutting
Science, Maths & Technology

Flame cutting

...cast” layer. High alloy steels, cast irons and non-ferrous metals cannot usually be cut by conventional flame cutting and require “powder cutting” or plasma arc cutting. Design: Used mainly for cutting and profiling sheet and plate. Main use is for a variety of weld edge preparations. U-profiles, for single and double U-butt welding of thick plate, can be produced...
View article Flame cutting
Article 5 mins
On the loss of a baby
Health, Sports & Psychology

On the loss of a baby

...SANDS) many people think that stillbirth occurs as a result of some genetic or developmental problem. However, this occurs in fewer than one in ten stillborn babies. For as many as 6 in 10 stillborn babies, the cause of death is unknown. Not knowing the cause of death may mean that there are many questions that remain unanswered, and parents can feel despair at not being...
View article On the loss of a baby
Article 5 mins