Rocks & mirror
WÄRTSILÄ
Encyclopedia of Marine and Energy Technology

A

303 results

ALARP

energy

ALARP ("as low as reasonably practicable"), or ALARA ("as low as reasonably achievable"), is a principle in the regulation and management of safety-critical and safety-involved systems.

Albedo

energy

Albedo is the measure of the diffuse reflection of solar radiation out of the total solar radiation and measured on a scale from 0, corresponding to a black body that absorbs all incident radiation, to 1, corresponding to a body that reflects all incident radiation.

Aldis lamp

marine

A hand-held electrically operated signal lamp.

Algae fuel

energy

Algae fuel, algal biofuel, or algal oil is an alternative to liquid fossil fuels that uses algae as its source of energy-rich oils.

Alignment

marine

An arrangement of different structural members in one straight line: alignment of butt welds, alignment of stiffeners, etc. Many ships have suffered when other design requirements have been assigned undue priority over structural alignment.

Alkaline battery

energy

A type of primary battery which derives its energy from the reaction between zinc metal and manganese dioxide.

Alkaline fuel cell

energy

One of the most developed fuel cell technologies.

Alkene

energy

In chemistry, an alkene is a hydrocarbon that contains a carbon–carbon double bond.

Alkyd resin

marine

A synthetic resin made by a reaction of two chemicals in the presence of natural or processed oil.

Alkylation

energy

In oil refining contexts, alkylation refers to a particular alkylation of isobutane with olefins.

All electric vehicle

energy

A battery electric vehicle or all-electric vehicle is a type of electric vehicle (EV) that exclusively uses chemical energy stored in rechargeable battery packs, with no secondary source of propulsion.

Alleyway

marine

Any corridor aboard vessel connecting one part of the accommodation to another part.

Allision

marine

The act of striking or collision of a moving vessel against a stationary object.

Allotropy

energy

Allotropy or allotropism is the property of some chemical elements to exist in two or more different forms, in the same physical state, known as allotropes of the elements.

Alloy

energy

An alloy is an admixture of metals, or a metal combined with one or more other elements.

Alloy flux

marine

A flux which the alloy content of the weld metal is largely dependent on.

All-weld-metal test specimen

marine

A test specimen with the reduced section composed entirely of weld metal.

Alpha decay

energy

Alpha decay or α-decay is a type of radioactive decay in which an atomic nucleus emits an alpha particle (helium nucleus) and thereby transforms or 'decays' into a different atomic nucleus, with a mass number that is reduced by four and an atomic number that is reduced by two.

Alpha particle

energy

Alpha particles, also called alpha rays or alpha radiation, consist of two protons and two neutrons bound together into a particle identical to a helium-4 nucleus.

Alpine climate

energy

Alpine climate is the typical weather (climate) for the regions above the tree line.

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