دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: one of the extremely small particles of an atom that is ejected from a radioactive substance (such as radium or uranium) as it disintegrates. Alpha particles have a positive charge.

n: the smallest quantity of an element capable of either entering into a chemical combination or existing alone.

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

n: a high-energy gamma ray emitted when the nucleus of an atom captures a neutron and becomes intensely excited. Capture gamma rays are counted by the neutron logging detector.

a chlorine atom substituted onto an alkane (hydrocarbon chain). These materials have been identified as refinery catalyst poisons.

an atom that results from the radioactive decay of a parent atom.

n: The definite stiff orientation that diamond presents since arrangement of natural diamond atom is different.

n: an earthy deposit made up of the siliceous cell walls of onecelled marine algae called diatoms. It is used as an admixture for cement to produce a lowdensity slurry.

silica particles from Diatom beds. Used as a filtering media and as an additive to cement.

n: a collision between a neutron and the nucleus of an atom of an element such as hydrogen. In such a collision, the neutrons energy is reduced by exactly the amount transferred to the nucleus with which it collided. The angle of collision and the relative mass of the nucleus determine energy loss.

n: a particle in an atom that has a negative charge. An atom contains the same number of electrons and protons (which have a positive charge). Electrons orbit the nucleus of the atom.