directional field

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• Directional drilling — A horizontal directional drill in operation Directional drilling (or slant drilling) is the practice of drilling non vertical wells. It can be broken down into three main groups: Oilfield Directional Drilling, Utility Installation Directional… …   Wikipedia

• Directional sound — See sound from ultrasound for a beam of ultrasound that makes audible sound in a restricted target area without a receiving set. Directional Sound refers to the notion of using various devices to create fields of sound which spread less than most …   Wikipedia

• Directional derivative — In mathematics, the directional derivative of a multivariate differentiable function along a given vector V at a given point P intuitively represents the instantaneous rate of change of the function, moving through P in the direction of V. It… …   Wikipedia

• Directional Sound — See sound from ultrasound for a beam of ultrasound that makes audible sound in a restricted target area without a receiving set. Directional Sound refers to the notion of using various devices to create fields of sound which spread less than most …   Wikipedia

• Directional array — In broadcast engineering, directional array refers to an antenna array arranged such that the superposition of the electromagnetic waves produce a predictable electromagnetic field. By spacing 2 or more antenna elements apart, changing the length …   Wikipedia

• Directional Recoil Identification From Tracks — The DRIFT IIb Detector removed from the vacuum vessel for maintenance. The Directional Recoil Identification From Tracks (DRIFT) detector is a low pressure negative ion time projection chamber (NITPC) designed to detect weakly interacting massive …   Wikipedia

• List of oil field acronyms — Contents 1 # 2 A 3 B 4 C …   Wikipedia

• Power dividers and directional couplers — A 10 dB 1.7–2.2 GHz directional coupler. From left to right: input, coupled, isolated (terminated with a load), and transmitted port …   Wikipedia

• Localizer Type Directional Aid — is of a comparable accuracy and use to the Localizer, except that LDA is not aligned with the runway. If the alignment is not greater than 30 degrees, straight in approach minima may be published. Circling minima only are published when alignment …   Wikipedia

• Simplified Directional Facility — or SDF is similar to a Localizer, although is not as precise. The SDF signal is fixed at either 6 or 12 degrees, as necessary maximum flyability and optimum course quality.The SDF course may or may not be aligned with the runway because its… …   Wikipedia

• Near and far field — This article is about the electromagnetic concept. For the mathematical, see Near field (mathematics). Antenna field regions for antennas that are shorter than the wavelength of the radiation they emit, such as the whip antenna of a citizen s… …   Wikipedia