451 search results
Asset allocation in investment
Money & Business

Asset allocation in investment

...liquidity – is an asset saleable within a reasonable time frame? – and on drawdown - the decline in value from peak to trough over a period - as well as how long a portfolio takes to recover that loss. The investment management regulator, the Financial Conduct Authority or FCA (previously called the FSA), has recognised that the simple measure, volatility or standard...
View course Asset allocation in investment
Level 3: Advanced 9 hrs
Water for life
Nature & Environment

Water for life

...liquid water that would be produced by melting the solid ice and snow and by condensing the water vapour from the atmosphere. It is important to note that all of the volumes shown in Table 1 are estimates; clearly, no one has been able to measure the volume of water in the oceans accurately. Table 1 Estimated volumes of water stored in the Earth's natural reservoirs. To...
View course Water for life
Level 1: Introductory 15 hrs
Plasma arc welding
Science, Maths & Technology

Plasma arc welding

...solid-state power switching circuitry, to reverse polarity during welding. Surface cleanliness is important. Wire feeders supply wire at rates of 25–250 cm min-1. Good weld properties are achieved. Titanium and zirconium can be welded up to sections 19 mm thick using high purity argon. Stainless steel and nickel alloys up to 19 mm thick are welded in argon/5–8%...
View article Plasma arc welding
Article 10 mins
Diffusion bonding (SPF/DB or form bonding)
Science, Maths & Technology

Diffusion bonding (SPF/DB or form bonding)

...solid state welding process where two surfaces are bonded together, over time, using heat and pressure, usually under vacuum or inert gas to avoid contamination. Used for metals that are hard to weld by conventional fusion welding. Filler metal is not needed, because atoms from each surface diffuse into each other to create the bond...Diffusion bonding [Images to...
View article Diffusion bonding (SPF/DB or form bonding)
Article 10 mins
Darwin crosses the Sierra de la Ventana
History & The Arts

Darwin crosses the Sierra de la Ventana

...solid rock. They resembled in hardness, and in the nature of the cement, the masses which may be seen daily forming on some coasts. I do not doubt these pebbles were in a similar manner aggregated, at a period when the great calcareous formation was depositing beneath the surrounding sea. We may believe that the jagged and battered forms of the hard quartz yet show the...
View article Darwin crosses the Sierra de la Ventana
Article 5 mins
Squeeze casting and squeeze forming
Science, Maths & Technology

Squeeze casting and squeeze forming

...liquid metal into die cavity via a "launder". [Diagrams to demonstrate the squeeze casting/squeeze forming process] Stage 2 Press actuated to bring two parts of die set together. Metal displaced to fill die cavity and pressure held until solidification is complete. [Diagrams to demonstrate the squeeze casting/squeeze forming process] Stage 3 Press ram withdrawn. Die set...
View article Squeeze casting and squeeze forming
Article 5 mins
The Z Files: Professor Geoff Palmer
Health, Sports & Psychology

The Z Files: Professor Geoff Palmer

...liquids, and you’re responsible for a lot of this, tell us what do we have here? Prof Geoff Palmer Well what we have here is a gallery of whiskies. If I said that when I was five years old in Jamaica I thought what I want to be is a great scientist and end up in this room will be a lie. A lot of it is accident. This is to me surprising and wonderful. Benjamin Zephaniah...
View video The Z Files: Professor Geoff Palmer
Video 5 mins
The struggle to save the seabirds after the Torrey Canyon disaster
Nature & Environment

The struggle to save the seabirds after the Torrey Canyon disaster

...coagulative necrosis and haemorrhage in many cases. The lungs were often congested and the air-sacs clouded. Gross renal changes were more frequent in phase 2. Phase 3 (47 live birds, 11 deaths, 1.4% per day) lasted from the 4th day until 3 weeks and was characterised by a transition from the acute conditions of phases 1 and 2 to the chronic conditions of phase 4. Phase 4...
View article The struggle to save the seabirds after the Torrey Canyon disaster
Article 10 mins