Les pneus usagés constituent une catégorie de déchets dont l'élimination peut être problématique en raison de leur structure très complexe, de la diversité de la composition de la matière première et de la qualité du caoutchouc. Le caoutchouc représente 70 à 80 % de la masse du pneu, tandis que le reste est constitué de ceintures en acier et de revêtements textiles, qui doivent être séparés du caoutchouc lors du recyclage. Le recyclage des pneus est basé sur l'élimination mécanique, thermique ou chimique de la fraction de caoutchouc. La mise en décharge des pneus usagés...

Green hydrogen is a hydrogen-produced fuel obtained from electrolysis of water with electricity generated by low-carbon power sources. It is a clean fuel that, when consumed in a fuel cell, produces only water. It can be produced from a variety of domestic resources, such as natural gas, nuclear power, biomass, and renewable power like solar and wind. These qualities make it an attractive fuel option for transportation and electricity generation applications. It can be used in cars, in houses, for portable power, and in many more applications. Also, it is an energy carrier that can be used to...

In the current leading technology, steam-methane reforming, for producing hydrogen in large quantities extracts hydrogen from methane. However, this reaction releases fossil carbon dioxide and carbon monoxide into the atmosphere which are greenhouse gases exogenous to the natural carbon cycle, and thus contribute to climate change. In electrolysis, electricity is run through water to separate the hydrogen and oxygen atoms. This method can use wind, solar, geothermal, hydro, fossil fuels, biomass, nuclear, and many other energy sources. Obtaining hydrogen from this process is being studied as...

Altreifen sind eine Abfallkategorie, deren Entsorgung aufgrund ihrer sehr komplexen Struktur, der unterschiedlichen Zusammensetzung des Rohmaterials und der Qualität des Gummis problematisch sein kann. Der Gummi macht 70-80 % der Reifenmasse aus, während der Rest aus Stahlgürteln und Textilauflagen besteht, die beim Recycling vom Gummi getrennt werden müssen. Das Reifenrecycling basiert auf der mechanischen, thermischen oder chemischen Entfernung der Gummifraktion. Die Deponierung von Altreifen war in der Vergangenheit weit verbreitet und wird in einigen Ländern immer noch praktiziert....

Even though wind power generates electricity rather than liquid fuels, and thus is not an immediate substitute for petroleum in most applications (especially transport), fears over petroleum shortages only added to the urgency to expand wind power. Earlier oil crises had already caused many utility and industrial users of petroleum to shift to coal or natural gas. Wind power showed potential for replacing natural gas in electricity generation on a cost basis.By 2021 wind energy produced 4872 terawatts-hour, 2.8% of the total primary energy production and 6.6% of the total electricity...

Energy future and conservation is the effort made to reduce the consumption of energy by using less of an energy service. This can be achieved either by using energy more efficiently (using less energy for a constant service) or by reducing the amount of service used (for example, by driving less). Energy conservation is a part of the concept of Eco-sufficiency. Energy conservation measures (ECMs) in buildings reduce the need for energy services and can result in increased environmental quality, national security, personal financial security and higher savings. It is at the top of the...

Stereomicroscopes can be roughly divided into two basic families, each of which has both positive and negative characteristics. The oldest stereomicroscopic system, named after the inventor Greenough, utilizes twin body tubes that are inclined to produce the stereo effect.A newer system, termed the common main objective, utilizes a single large objective that is shared between a pair of eyepiece tubes and lens systems. Either type of microscope can be equipped with step-type individual lenses to change magnification, or a continuously variable zoom-type magnification system.The main...