How Ecosystems Work | Biology | Ecology

Purchase DVD here www.greatpacificmedia.com Segment from the program How Ecosystems Work: Energy Flow and Nutrient Cycles. DVD Description Looks at the processes that are fundamental to all ecosystems. First the concepts of primary productivity, trophic levels, food chains, energy pyramids and the flow of energy through ecosystems are introduced. The program then explains how carbon, nitrogen, phosphorous and water cycle through ecosystems and how human activities can disrupt these cycles and throw them out of balance leading to accelerated eutrophication in lakes in the case of phosphorous imbalances and global warming in the case of carbon imbalances.
Video Rating: 4 / 5

A high pole count axial flux motor allows for extremely efficient use of energy and a very powerful electromagnet motor. The motor is comprised, at its most basic level, of 3 parts: rotor, stator, and shaft. The rotor houses the specifically spaced, alternating pole, magnet configuration. There are two rotors on either side of the stator. The stator houses the wire coils, which are arranged so that they repel or attract a magnet on the stator at a precise instant in time to allow the rotors to spin while the stator remains stationary. All of this is fixed to a shaft to transfer the mechanical energy. The magnetic flux generated by wire coils repels (or attracts) magnets close to it, which done with specific timing allow the outside rotor to spin. However, the reason why these motors arent in widespread use is because they are hard to control.
Video Rating: 5 / 5