دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

(A) n: the fundamental unit of electrical current;1 ampere = 6.28 x 1018 electrons passing through the circuit per second. One ampere delivers I coulomb in 1 second. ampere-hour n: a unit of electricity equal to the amount produced in 1 hour by a flow of I ampere. See ampere.

n: 1. one of two electrodes in an electrolytic cell;represented as the negative terminal of the cell, it is the area from which electrons flow. In a primary cell, it is the electrode that is wasted or eaten away. 2. in cathodic protection systems, an electrode to which a positive potential of electricity is applied, or a sacrificial anode, which protects a structure by forming one electrode of an electric cell.

the positively charged site in a cell. Oxidation site. The site of metal loss in corrosion.

n: a number that expresses the number of protons and an equal number of electrons in each atom of an element.

n: one of the extremely small particles, sometimes called rays, emitted from the nucleus of a radioactive substance such as radium or uranium as it disintegrates. Beta particles have a negative charge.

an electron emitted with high energy and velocity from a decaying nucleus.

n: part of a company that interprets and processes the charts. The departments responsibilities include calculating the gas flow from the information on the chart. Today, charts have been largely supplanted by electronic readouts generated by computer controlled sensors at the orifice meter station. These readouts are transmitted to the companys computers in a central, or district, office, where they are recorded and read.

n: a reaction in which gamma rays with intermediate energy levels (0.6 to 2.5 million electron volts) lose their energy by colliding with orbital electrons.

a gamma-ray reaction in which the gamma-ray, after colliding with an electron, shifts some energy to the electron. The higher the energy loss by Compton scattering in a zone, the higher the electron concentration or density. The basis for the density log.

A chemical bone between atoms whereby incomplete electron orbits in the bonded atoms are satisfied by the two atoms sharing one electron. Some covalent compounds do display some ionic character, where the sharing is somewhat unequal (e.g. water) and th

the combination of two of more atoms by sharing of electrons. Covalent bonds are generally stronger than other bonds.

n: a method of forming compounds in which atoms share electrons, thus forming nonpolar, or covalent, unions.