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Sludgecontest.jpg As part of the Emergency Sanitation Project, the International Federation of Red Cross and Red Crescent Societies announce a student emergency sanitation design project. Deadline 3 March 2014


An LED traffic light
LED traffic light FAQ. Here are a number of frequently asked questions concerning retrofitting street lights with LEDs. For full information see LED.

What does an LED traffic light look like? An LED traffic light looks very similar to a regular traffic light. It still gets the job done and is actually brighter. An LED is actually very small and therefore the traffic light is made up of a bunch of smaller lights, this is apparent when you look closely. The color of the light depends on the exact composition inside the bulb.
Who Invented the LED? It all began when Oleg Vladimirovich created the first LED in 1927. There was no practical use for it until 1962 when it was discovered that the infrared LED could be changed into a visible red LED.
How does an LED work? An LED is basically a tiny light bulb with a semiconductor diode in place of a filament. Inside the diode, there are positively and negatively charged areas. When a voltage is applied to the diode with the positive end hooked up to the negative area and the negative end hooked up to the positive area the electrons inside become excited and jump from the positively charged to negatively charged areas. This interaction produces light.
What is a diode? A diode is a component that restricts the directional flow of charge carriers. Also a diode allows an electric current to flow in one direction, but blocks it in the opposite direction.

Wild Chick Farm

Recent winners of the $25,000 Economic Fuel award. Wild Chick Farm pecks ahead on local sustainable chicken raising.

Helen Keller
The mystery of language was revealed to me. I knew then that ‘W-A-T-E-R’ meant the wonderful cool something that was flowing over my hand. That living word awakened my soul, gave it light, joy, set it free.

Helen KellerW
Planted cattails at Millcreek greywater
Greywater, sometimes also spelled as graywater, grey water or gray water, is all of the effluent water from a household, such as water discharged from lavatories (bathroom sinks), bathtubs, showers, clothes washers, and laundry trays. Greywater is not wastewater from a sink used for food preparation, or water closet (toilet) wastewater.

The water leaving our homes carries nutrients and value. It may also contain pathogens, and/or harsh chemicals and care should be taken with it. However, it is not a great risk compared to blackwater (sewage).

Redirecting the water we use for tasks such as showering allows us to reclaim some of that value to grow plants and recharge the water table. It may be necessary to choose our soaps and detergents more carefully, if we use the greywater for watering and fertilizing plants.

Main portal: Water
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Queen's Applied Sustainability Research Group completed projects and publications: This category lists completed projects for the Category:Queens Applied Sustainability Group. Following the individual links leads to a summary of the project and key findings, related Category:Queens Applied Sustainability Group Literature Reviews, Category:Queens Applied Sustainability Group Lab Protocols , and an open access version of the paper published in a peer reviewed journal.

Queen's Applied Technology Research Group Completed Projects and Publications

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