trans-, tran-, tra-

1. The therapeutic passing of high-frequency electric currents through the body by means of external electrodes in order to generate heat within the body.
2. Medical diathermy, in which the tissues are warmed but not sufficiently to change their nature.
3. Surgical diathermy, in which there is sufficient heating to produce a local change such as destruction of tissue or coagulation of bleeding vessels.
4. Local elevation of temperature within the tissues, produced by high frequency current, ultrasonic waves, or microwave radiation.

1. The reflection of electromagnetic radiation from a surface in all directions evenly.
2. The ratio of the diffusely reflected part of the whole reflected flux, to the incident flux.

Flux is the rate of flow of something: such as, energy, particles, or fluid volume across or onto a given area.

The transfer of blood directly from one person to another person.

1. A tool which produces voltage by utilizing the motion of a permanently polarized foil placed next to a metal-coated plate.
2. An electroacoustic or electromechanical transducer in which a foil electret, stretched out to form a diaphragm (a porous plate or cylinder dividing an electrolytic cell), is placed next to a metal or metal-coated plate, and the motion of the diaphragm is converted to voltage between the diaphragm and the plate, or the reverse order.

1. The primary process by which an atom produces or absorbs radiation when it changes from one energy level to another one.
2. A transition of an atom or nucleus from one energy status to another one during which an electric dipole radiation is emitted or absorbed.

An electric power line that provides large amounts of power at a high voltage to remote locations.

1. The large-scale production of electric power for various commercial, industrial, residential, and rural use, generally in stationary plants designed for that purpose.
2. The process of transferring electric energy from one point to another in an electric power system.
3. The production of bulk electric power for industrial, residential, and rural use.

Although limited amounts of electricity can be generated in various ways, including chemical reaction (as in batteries) and engine-driven generators (as in automobiles and airplanes), electric power generation generally implies large-scale production of electric power in stationary plants designed for that purpose.

The generating units in these plants convert energy from falling water, coal, natural gas, oil, and nuclear fuels to electric energy.

Most electric generators are driven either by hydraulic turbines, for conversion of falling water energy; or by steam or gas turbines, for conversion of fuel energy. Limited use is being made of geothermal energy, and developmental work is progressing in the use of solar energy in its various forms.

1. A transition of an atom or molecule from one energy state to another, in which electric quadrupole radiation is emitted or absorbed.
2. A process in which an atom produces or absorbs quadrupole radiation when it changes from one energy level to another.

A transducer in which all of the waves are electric or a two-port device that processes electrical signals.

A transducer is a device that transforms one type of energy into another; for example, a microphone, a photoelectric cell, or an automobile horn.

1. A temporary component of current and voltage in an electric circuit which has been disturbed.
2. A current or voltage that appears temporarily in an electric circuit whose steady-state condition has been disrupted.

A reinforced steel tower that supports a high-voltage power-transmission line.

It is designed to maintain a large space between conductors and between each conductor and the earth's surface in order to prevent corona discharge or a discharge of electricity appearing as a bluish-purple glow on the surface of and adjacent to a conductor when the voltage gradient exceeds a certain critical value; due to ionization of the surrounding air by the high voltage.

Corona discharge can result in power loss in the transmission of electric power, but it is used in photocopying machines and air-purification devices.

An instrument part which determines a fluid pressure and produces an electrical, mechanical, or pneumatic signal related to the pressure.

Although pneumatic and mechanical transducers are commonly used, electrical measurement of pressure is often preferred because of a need for long-distance transmission, higher accuracy requirements, more favorable economics, or quicker responses.

Electrical pressure transducers may be classified depending on the operating principle as resistive transducers, strain gages, magnetic transducers, crystal transducers, capacitive transducers, or resonant transducers.

The application of weak electrical currents to modulate the activity of neurons in the brain.

The procedure utilizes small pulses of electric current across a patient's head in an attempt to treat anxiety, depression, insomnia, stress, and drug addiction.

1. A recording of a complete radio program, made especially for broadcast purposes.
2. A radio broadcast from a phonograph record or the phonograph record itself.
3. A radio program broadcast from a special phonograph record or tape recording or the recording itself.

When radio stations first started to record programs, they recorded on "electrical transcription disks".

Any voltage or current that deviates from the normal steady-state condition.