Relation of a quantity of cover land (in cubic meters) and the amount of exploitable or exploitable coal (in cubic meters) for an opencast operation.

Relation between the vertical thickness of the cover lands and the intermediate layers and the vertical thickness of the bed or beds. The exploitable thickness of the coal is equal to one.

Distance between the aerodynamic center of the blade profile and the axis of rotation measured in the plane perpendicular to the axis of rotation.

Product of the voltage or electromotive force by the reactive current at effective values. Note 1: The reactive current is the component of a current out of phase of 90. in relation to the voltage and does not contribute to supply power, but increases the losses of the system. Note 2: Reactive current is used to excite magnetic fields (in motors or transformers) or electric fields (in capacitors).

Product of the geometric concentration ratio by the optical yield of a cell.

Schlam (sludges) recovery, slag fuel sludge, regenerated lubricants, reclaimed products in industry or agricultural waste, etc. Sometimes accounted for in the procurement.
Note: it is therefore necessary to pay attention to the risks of double counting and, if the recovery of waste (urban or agricultural) is generally accounted for with primary production, the recovery from energy already accounted for elsewhere (recovery Of heat, for example) should be considered as a balance.

Relationship between a produced resource and an on-site resource. Expressed as a percentage; For hydrocarbons.

Renewable Energy Certificate System.

Electrical installation designed to transform alternating current (single-phase or multi-phase) into direct current.

Time interval to which certain data refer. Equivalent to the sum of the availability and unavailability times in the context of this Section.

Quotient of reflected luminous flux Ir and vertical and incident luminous flux Io on the body to be tested. Note: The degree of reflection of a body depends on its nature, the orientation and the state of the surfaces, as well as the wavelength and color of the light.

Relation between the radiation reflected by a surface and the radiation incident on that surface. It also depends on the wavelength.

Canal that restores the water used to the natural bed of the watercourse.

When the published information refers to the term region, the scale at which it is to be understood is at the country level.

When the published information refers to the term region, the scale at which it is to be understood is at the country level.

Curve representing the level of the water surface in the reservoir from the dam to its end.

Support devices for the walls and roofs of excavations, whether by their support (frames or timber or metal supports), by hanging (bolts or screws) or by any other means ensuring the stability of the cavities for the time necessary for the operation.

Total emission of waste water for rivers and estuaries. It includes the treated liquid effluents and the cooling water, rejected in rivers and estuaries.

Total emission of wastewater to the sea. Includes treated liquid effluents and cooling water, discarded at sea.