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  • Computable general equilibrium


    Computable general equilibrium (CGE) models are a class of economic models that use actual economic data to estimate how an economy might react to changes in policy, technology or other external factors. CGE models are also referred to as AGE (applied general equilibrium) models.

  • Landing gear


    Retraction of the landing gear of a Boeing 727 after take-off undercarriage of an Airbus A380-800 Experimental tracked gear on a B-36 PeacemakerBoeing Washington B.I with tail "bumper" deployedLanding gear is the undercarriage of an aircraft or spacecraft and may be used for either takeoff or landing. For aircraft it is generally both. It was also formerly called alighting gear by some manufacturers, such as the Glenn L. Martin Company. For aircraft, the landing gear supports the craft when it is not flying, allowing it to take off, land, and taxi without damage. Wheels are typically used but skids, skis, floats or a combination of these and other elements can be deployed depending both on the surface and on whether the craft only operates vertically (VTOL) or is able to taxi along the surface. Faster aircraft usually have retractable undercarriages, which fold away during flight to reduce air resistance or drag. For launch vehicles and spacecraft landers, the landing gear is typically designed to support the vehicle only post-flight, and are typically not used for takeoff or surface movement.

  • Environmental aspects of the electric car


    The Tesla Model S (left) and the Tesla Model X (right) Electric cars have some disadvantages, such as: Heavy reliance of rare-earth elements such as neodymium, lanthanum, terbium, and dysprosium, and other critical metals such as lithium and cobalt, though the quantity of rare metals used differs per car. Reliance on rare earth elements is problematic as these resources are finite. Possible increased particulate matter emissions from tyres. This is sometimes caused by the fact that most electric cars have a heavy battery, which means the car's tyres are subjected to more wear. The brake pads, however, can be used less frequently than in non-electric cars, if regenerative braking is available and may thus sometimes produce less particulate pollution than brakes in non-electric cars Also, some electric cars may have a combination of drum brakes and disc brakes, and drum brakes are known to cause less particulate emissions than disc brakes.These disadvantages can be solved using different battery types. As in combustion cars, the carbon dioxide emitted for the manufacturing should be taken into account.

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