thumb|right|300px|The Traffic Light colour convention, showing the concept of Harvest Control Rule, specifying when a rebuilding plan is mandatory in terms of precautionary and limit reference points for spawning mortality rate.]] The notion of overfishing hinges on what is meant by an acceptable level of fishing. A current operational model used by some fisheries for [...]
Biomass
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Artificial photosynthesis is a renewable, carbon-neutral source of fuel, producing either hydrogen, or carbohydrates. This sets it apart from the other popular renewable energy sources — hydroelectric, solar photovoltaic, geothermal, and wind — which produce electricity directly, with no fuel intermediate. As such, artificial photosynthesis may become a very important source of fuel for transportation. [...]
The number of fertile individuals produced by colonies of ”N. corniger” varies widely. Mature colonies with between 50,000 and 400,000 infertile workers generally produce between 5,000 and 25,000 alates. In some years large colonies do not produce a fertile brood. Alate nymphs develop through five instars and spend between 5 and 8 months within the [...]
In wild fisheries, overexploitation or overfishing occurs when a fish stock has been fished down “below the size that, on average, would support the long-term maximum sustainable yield of the fishery”. However, overexploitation can be sustainable. When a fishery starts harvesting fish from a previously unexploited stock, the biomass of the fish stock will decrease, [...]
Cellulase is used for commercial a food processing in coffee. It performs hydrolysis of cellulose during drying of beans. Furthermore, cellulases are widely used in textile industry and in laundry detergents. They have also been used in the pulp and paper industry for various purposes, and they are even used for pharmaceutical applications. Cellulase is [...]
Cofiring is the combustion of two different types of materials at the same time. One of the advantages of cofiring is that an existing plant can be used to burn a new fuel, which may be cheaper or more environmentally friendly. For example, biomass is sometimes cofired in existing coal plants instead of new biomass [...]
Carlson’s index is one of the more commonly used trophic indices, and is the trophic index used by the United States Environmental Protection Agency. The ”trophic state” is defined as the total weight of biomass in a given water body at the time of measurement. Because they are of public concern, the Carlson index uses [...]
Advantages UV water treatment devices can be used for well water and surface water disinfection. UV treatment compares favorably with other water disinfection systems in terms of cost, labor and the need for technically trained personnel for operation: deep tube wells fitted with hand pumps, while perhaps the simplest to operate, require expensive drilling rigs, [...]
Almost all coal, nuclear, geothermal, solar thermal electric, and waste incineration plants, as well as many natural gas power plants are thermal. Natural gas is frequently combusted in gas turbines as well as boilers. The waste heat from a gas turbine can be used to raise steam, in a combined cycle plant that improves overall [...]
Navarre leads Europe in its use of renewable energy technology and is planning to reach 100% renewable electricity generation by 2010. By 2004, 61% of the region’s electricity was generated by renewable sources consisting of 43.6% from 28 wind farms, 12% from over 100 small-scale water turbines, and 5.3% from 2 biomass and 2 biogas [...]
Topping cycle plants primarily produce electricity from a steam turbine. The exhausted steam is then condensed, and the low temperature heat released from this condensation is utilized for e.g. district heating or water desalination. Bottoming cycle plants produce high temperature heat for industrial processes, then a waste heat recovery boiler feeds an electrical plant. Bottoming [...]
* BedZED, the UK’s largest eco-village * The sustainability strategy for the 2012 Olympics in London * Reviving local lavender production in Carshalton and Mitcham * Croydon TreeStation, a solution for sustainable management of urban forestry to produce biomass fuel * Local Paper for London, Local Paper for Surrey, promoting closed loop recycling to businesses [...]
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