Science / Marine Biology / Quadrat: An ecological sampling unit that consists of a square frame of known area. The quadrat is used for quantifying the number or percent cover of a given species within a given area. See also transect.

Quadratic Programming

Business / Finance / Quadratic Programming: Variant of linear programming in which the objective function is quadratic rather than linear. In portfolio selection, we often minimize the variance of the portfolio (which is a quadratic function) s MORE

Quadrature Amplitude Modulation (QAM)

Technology / Computers / Quadrature Amplitude Modulation (QAM): A method of modulating digital signals using both amplitude and phase coding. Used for downstream and can be used for upstream. MORE

Quadrate, Quartile

Science / Astrology / Quadrate, Quartile: Synonymous with square. See Square. MORE

Quadrature Of Moon

Science / Tides and Currents / Quadrature Of Moon: Position of the Moon when its longitude differs by 90° from the longitude of the Sun. The corresponding phases are known as first quarter and last quarter. MORE

Quadrature Phase-Shift Keying (QPSK)

Technology / Computers / Quadrature Phase-Shift Keying (QPSK): A method of modulating digital signals using four phase states to code two digital bits per phase shift. MORE

Sesquiquadrate, Sesqui-Square

Science / Astrology / Sesquiquadrate, Sesqui-Square: A multiple of the semi-square, and eighth harmonic aspect. A minor hard aspect, separating distance 135°, its influence is frictional. MORE