718 search results
Animals at the extremes: polar biology
Nature & Environment

Animals at the extremes: polar biology

...energy storage and reproductive habits as well as thermoregulation. In many cases, such changes involve ‘ordinary’ physiological mechanisms being pushed to extremes. The study of such physiological adaptations can help us to understand how humans and domestic animals could cope with similar conditions that arise under artificial or pathological conditions. For...
View course Animals at the extremes: polar biology
Level 2: Intermediate 14 hrs
Introducing mammals
Nature & Environment

Introducing mammals

...energy expenditure will make the minimum demand on the meagre pasture around her, and she has a fertile dormant egg within her womb ready to start its development just as soon as conditions improve...Introducing mammals: 5 Milk production (lactation) - One of the defining features of mammals is milk production. It is a remarkable and unique mammalian process technically...
View course Introducing mammals
Level 1: Introductory 5 hrs
Extreme endurance performances – who, what and why?
Health, Sports & Psychology

Extreme endurance performances – who, what and why?

...energy and vigour and lower levels of negative mood states. While Dr Roebuck stresses the positive benefits of extreme endurance sports it is important to say that they can also have a downside. For example, the characteristics that make these sports attractive can facilitate behaviours associated with exercise addiction (Nogueira et al., 2018). To be successful at...
View course Extreme endurance performances – who, what and why?
Level 1: Introductory 8 hrs
Animals at the extremes: the desert environment
Nature & Environment

Animals at the extremes: the desert environment

...energy gain and routes of heat loss for the lizard? Answer The lizard gains heat energy via thermal radiation from the Sun, the atmosphere and the ground. Heat energy is lost via conduction from the body to the ground, by evaporative water loss, convection and thermal radiation to the sky. On a hot sunny day, more heat is gained than lost, and it is important for a desert...
View course Animals at the extremes: the desert environment
Level 2: Intermediate 14 hrs
Plasma arc cutting
Science, Maths & Technology

Plasma arc cutting

...Energies of approximately 10kWh m-3 and thermal efficiencies of 85–90% can be achieved. There are three commonly used plasma systems. Manufacture An alternative to flame cutting, laser cutting, electrical discharge wire cutting and abrasive jet cutting. Used mainly for profile cutting of metal sheets and slabs up to 200 mm thick, but can also be used for cutting,...
View article Plasma arc cutting
Article 5 mins
Electrochemical Machining (ECM)
Science, Maths & Technology

Electrochemical Machining (ECM)

...energy. An electrolyte medium separates the tool (cathode) from the electrically conductive metal workpiece (anode), creating an electrolytic cell. A high amperage, low voltage current is passed through the cell, selectively dissolving away the material to be removed. Produces distortionless, burr-free components with an excellent surface finish in hard,
View article Electrochemical Machining (ECM)
Article 5 mins
Homage to Celtalonia
Society, Politics & Law

Homage to Celtalonia

...energy; pharmaceuticals; shipbuilding and repairs; sport and leisure; and, tourism sectors. In other words, what is termed a modern knowledge economy; In population size terms, it would be about two million smaller than the Netherlands and three million bigger than Belgium; Its total national income would be about 15% smaller than the former but about 20% bigger than the...
View article Homage to Celtalonia
Article 5 mins
Can high blood pressure protect the over-80s from dementia?
Health, Sports & Psychology

Can high blood pressure protect the over-80s from dementia?

...energy and is highly dependent on a constant supply of oxygen and nutrients that are carried by the blood. In extreme cases, a lack of blood supply in the brain can result in a stroke and vascular dementia. Damage to blood vessels in the brain is also implicated in the development of Alzheimer’s disease. In addition to delivering oxygen and nutrients, the blood vessels...
View article Can high blood pressure protect the over-80s from dementia?
Article 5 mins