Dual-fuel engine is the diesel engine that can run on both gaseous and liquid fuels. When running in gas mode, the engine works according to the Otto process where the lean airfuel mixture is fed to cylinders during the suction stroke.

According to HANSA International Maritime Journal – 02/2013 Delivered in 2013, the 15,600m3 capacity LNG carrier CORAL ENERGY is the first gas-fuelled ship with mechanical drive to the propeller

In electrical engineering, electrical terms are associated into pairs called duals.

The duck curve is a graph of power production over the course of a day that shows the timing imbalance between peak demand and renewable energy production.

DUCRETE (Depleted Uranium Concrete) is a high density concrete alternative investigated for use in construction of casks for storage of radioactive waste.

Ductility is a mechanical property commonly described as a material's amenability to drawing (e.g. into wire).

Due Diligence is the close scrutiny and evaluation prior to a lease, purchase or sale; especially in respect of economic, legal, tax and financial circumstances.

The non-wheeled panel in a stacking hatch cover system.

Timber boards which are laid under cargo parcels to keep the surface of the cargo off steel deck plate. Its purpose is to provide air space around the cargo and so prevent “cargo sweat”.

Loose particle matter present on a surface prepared for painting, arising from blastcleaning or other surface preparation processes, or resulting from the action of the environment.

The engineer responsible for machinery and equipment operation during unattended machinery space operation.

A liquid penetrant used to obtain an outline of fractures within the metal surface. To perform the test, a thin oil-like liquid containing a dye is applied by a brush, flow, or dip method; ...

A non-destructive test applied to metal items to detect surface cracks. A penetrant liquid is applied and is then detected in cracks by the use of a developer.

A dye-sensitized solar cell is a low-cost solar cell belonging to the group of thin film solar cells.

Glass that can used to assist in the regulation of temperature and light within a building thereby reducing the energy requirements of the building and emissions.

A load that produces significant acceleration of a body.

A seagoing vessel is subject to forces from wind, waves and currents as well as from forces generated by the propulsion system. Dynamic positioning is a capability of a vessel to maintain its position automatically using its propulsion system.

A hydrodynamic system which controls or maintains the position and heading of the vessel by centralized manual control or by automatic response to the variations of the environmental conditions within the specified limits.

Dynamic range is the ratio between the largest and smallest values that a certain quantity can assume.

Dynamic tidal power is an untried but promising technology for tidal power generation.