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A bird bath (or birdbath) is an artificial puddle or small shallow pond, created with a water-filled basin, in which birds may drink, bathe, and cool themselves. A bird bath can be a garden ornament , small reflecting pool , outdoor sculpture , and also can be a part of creating a vital wildlife garden .
The low speed surface aerator is a device for biology aeration with high efficiency. These devices are often in steel protected by epoxy coating and generate high torque. The mixing of water volume is excellent. The common power is going from 1 up to 250kw per unit with an efficiency (SOE) around 2 kgO2/kw.
An insolation map of the United States with installed PV capacity, 2019. A 2012 report from the National Renewable Energy Laboratory (NREL) described technically available renewable energy resources for each state and estimated that urban utility-scale photovoltaics could supply 2,232 TWh/year, rural utility-scale PV 280,613 TWh/year, rooftop PV 818 TWh/year, and CSP 116,146 TWh/year, for a ...
Called “Nature Intelligence,” a new AI-powered subscription option includes additional features: bird care tips; a “Name That Bird” option (which identifies a specific visitor, whom you ...
A 10-foot solar "tetroon" A 4 meters high solar balloon floats over a meadow. A solar balloon is a balloon that gains buoyancy when the air inside is heated by solar radiation, usually with the help of black or dark balloon material. The heated air inside the solar balloon expands and has lower density than the surrounding air.
Benson Bubbler: Oregon Portland: A. E. Doyle, architect 1912 For people Philanthropist Simon Benson initially installed 20 four-bowl drinking fountains. Portland now features 52 four-bowl Benson Bubblers and 74 single-bowl ones. David Campbell Monument [25] Portland Fireman's Memorial Oregon 1800 West Burnside Street, Portland: Avard Fairbanks
In 1872, the Italian physicist and engineer Enrico Bernardi combined three Franklin tubes to build a simple heat motor that was powered by evaporation in a way similar to the drinking bird. [16] In 1881 Israel L. Landis got a patent for a similar oscillating motor. [17] A year later (1882), the Iske brothers got a patent for a similar motor. [18]
The overall efficiency from collector to grid, i.e. (electrical output power)/(total impinging solar power) is about 15%, similar to photovoltaic cells but less than Stirling dish concentrators. Large-scale solar thermal power plants need a method for storing the energy, such as a thermocline tank, which uses a mixture of silica sand and ...
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