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Analytical thermal desorption. Analytical thermal desorption, known within the analytical chemistry community simply as "thermal desorption" (TD), is a technique that concentrates volatile organic compounds (VOCs) in gas streams prior to injection into a gas chromatograph (GC). It can be used to lower the detection limits of GC methods, and can ...
Command mode and Data mode. Command mode and Data mode refers to the two modes in which a computer modem may operate. These modes are defined in the Hayes command set, which is the de facto standard for all modems. These modes exist because there is only one channel of communication between the modem and the computer, which must carry both the ...
Abstract data type. In computer science, an abstract data type ( ADT) is a mathematical model for data types, defined by its behavior ( semantics) from the point of view of a user of the data, specifically in terms of possible values, possible operations on data of this type, and the behavior of these operations.
Analog-to-digital converter. In electronics, an analog-to-digital converter ( ADC, A/D, or A-to-D) is a system that converts an analog signal, such as a sound picked up by a microphone or light entering a digital camera, into a digital signal.
Differential thermal analysis ( DTA) is a thermoanalytic technique that is similar to differential scanning calorimetry. In DTA, the material under study and an inert reference are made to undergo identical thermal cycles, (i.e., same cooling or heating programme) while recording any temperature difference between sample and reference. [1]
In some Unix-like computer operating systems, it uses a daemon, atd, which waits in the background periodically checking the list of jobs to do and executing those at their scheduled time on behalf of at. Variants. The batch command can be used instead of at to only run scheduled jobs if the system's load average is below a certain value.
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Acute tryptophan depletion. Acute tryptophan depletion ( ATD) is a technique used extensively to study the effect of low serotonin in the brain. [1] This experimental approach reduces the availability of tryptophan, an amino acid which serves as the precursor to serotonin. [1] [2] The lack of mood-lowering effects after ATD in healthy subjects ...