Rocks & mirror
WÄRTSILÄ
Encyclopedia of Marine and Energy Technology

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Plutonium-239

energy

Plutonium-239 is also one of the three main isotopes demonstrated usable as fuel in thermal spectrum nuclear reactors, along with uranium-235 and uranium-233.

p–n junction

energy

A p–n junction is a boundary or interface between two types of semiconductor materials, p-type and n-type, inside a single crystal of semiconductor.

Pneumatic control valve

marine

A valve which regulates the flow of a fluid. It is remotelyoperated as the correcting unit of an automatic control system. The actuator is operated by compressed air.

Pneumatic conveyor system

marine

The loading/offloading system for dry powder material (cement) developed by Merevido Europe B.B.

Pneumatic motor

energy

A pneumatic motor (air motor), or compressed air engine, is a type of motor which does mechanical work by expanding compressed air.

Pneumatics

energy

Pneumatics is a branch of engineering that makes use of gas or pressurized air.

Pod

marine

An electric rudderpropeller, see Electric podded propulsors.

Point absorber buoy

energy

This device floats on the surface of the water, held in place by cables connected to the seabed.

Point of common coupling

energy

The point in the electric circuit where a microgrid is connected to a main grid.

Polar climate

energy

The polar climate regions are characterized by a lack of warm summers.

Polar orbiting satellite service

marine

A service based on polar orbiting satellites which receive and relay distress, alerts from satellite EPIRBs and which provides their position (SOLAS, Chapter IV).

Polarity symbols

energy

Polarity symbols are a notation for electrical polarity, found on devices that use direct current (DC) power, when this is or may be provided from an alternating current (AC) source via an AC adapter.

Pollutant

marine

A substance that makes air, waters, soil etc dangerously dirty.

Pollution

energy

Pollution is the introduction of contaminants into the natural environment that cause adverse change.

Pollution and accident control ship NEUWERK

marine

The highly-sophisticated 3830t displacement multi-purpose ship built in 1998 by Stralsund shipyard, Volkswerft GmbH.

Pollution containment and recovery equipment

marine

Collection and subsequent pumping of viscous oil is difficult unless specially developed equipment is used for spill clean up.

Pollution control ships

marine

The new generation of advanced coast protection vessels to deal with potential emergencies.

Polymer

marine

A high molecular weight material created from lower molecular weight constituents by chemical reaction. Polymers with resinous characteristics are frequently used in paints.

Polymer electrolyte membrane (PEM) fuel cell

energy

A type of fuel cell being developed mainly for transport applications, as well as for stationary and portable fuel-cell applications.

Polymer flat plate collectors

energy

These collectors are an alternative to metal collectors and are now being produced in Europe.

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