vendredi 30 mai 2014

Harvesting electricity from the greenhouse gas carbon dioxide

July 23, 2013 — A new method for producing electricity from carbon dioxide could be the start of a classic trash-to-treasure story for the troublesome greenhouse gas, scientists are reporting. Described in an article in ACS' newly launched journal Environmental Science & Technology Letters, the method uses CO2 from electric power plant and other smokestacks as the raw material for making electricity.


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Bert Hamelers, Ph.D., and colleagues explain that electric power-generating stations worldwide release about 12 billion tons of CO2 annually from combustion of coal, oil and natural gas. Home and commercial heating produces another 11 billion tons. Smokestack gas from a typical coal-fired plant contains about 10 percent CO2, which not only goes to waste, but is a key contributor to global warming. Hamelers' team sought a way to change that trash into a treasure.

They describe technology that would react the CO2 with water or other liquids and, with further processing, produce a flow of electrons that make up electric current. It could produce about 1,570 billion kilowatts of additional electricity annually if used to harvest CO2 from power plants, industry and residences. That's about 400 times the annual electrical output of the Hoover Dam. Like that dam and other hydroelectric power facilities, that massive additional amount of electricity would be produced without adding more CO2 to the atmosphere, Hamelers pointed out.

The authors acknowledge funding from the Dutch Ministry of Economic Affairs, the European Regional Development Fund, the Province of Fryslân, the City of Leeuwarden, the EZ/Kompas program of the "Samenwerkingsverband Noord-Nederland" and the European Union Seventh Framework Programme.

jeudi 1 mai 2014

Comment sont fabriqués les objets du quotidien

Vous vous demandez parfois comment sont fabriqués certains objets qui nous entourent, comme les gâteaux fourrés, les crayons ou les grillages des maisons. Vous allez enfin découvrir les procédés industriels qui créent nos objets du quotidien.

Les barrières d'autoroute

Barrière d'autoroute

Les ressorts

Ressort
Ressort

Les fourchettes en argent

Fourchette

Les Bretzels

(2 étapes)
Bretzels
Bretzels

Les Pringles

Pringles

Les crayons de cire

crayon de cire

Les sandwich à la crème glacée

Sandwich à la crème glacée

Les surligneurs

(test de longévité)
surligneur

Les crayons à papier

Crayon de papier

Les livres

(2 étapes)
Livre
Livres

Les Fortune Cookies

Fortune cookies

Les bouteilles en verre

(2 étapes)
Bouteille en verre
Bouteille en verre

Les briquets

briquet

Les macaronis

macaronis

Les saucisses de Strasbourg

(2 étapes)
saucisse
saucisse

Animation Stop-motion

animation

Chaîne en métal

chaîne

Les cure-dents

cure-dent

Les ballons de baudruche

 (2 étapes)
ballon
ballon

Les donuts

donut

Les gâteaux fourrés à la fraise

gâteaux fourrés fraise

Le grillage

grillage

Les préservatifs

(test + lubrification)
préservatif
préservatif

Le façonnage du fer

fer

Les casques militaires


casque

L'enrobage des bottes de foin

foin

Les publicités Old Spice

old spice

Les bonbons Jawbreaker


Bonbon Jawbreaker