In telecommunication, the term concentrator has the following meanings:
In data transmission, a functional unit that permits a common path to handle more data sources than there are channels currently available within the path. A concentrator usually provides communication capability between many low-speed, usually asynchronous channels and one or more high-speed, usually synchronous channels. Usually different speeds, codes, and protocols can be accommodated on the low-speed side. The low-speed channels usually operate in contention and require buffering.
A device that connects a number of circuits, which are not all used at once, to a smaller group of circuits for economy.
ISP usually use concentrators to enable modem dialin, this kind of concentrator is sometimes called a modem concentrator or a remote access concentrator.
My mind used to be so restless that I couldn't concentrate for more than a few minutes at a time before I got distracted.
By now I had not only found where concentration was located in the brain, I discovered that exercising your executive function and attentional control center directly is the most natural and quickest way to improve focus and concentration.
Concentrate at will and examine in depth any given topic, even in extremely distracting situations for extended periods of time and with less effort.
Often in informal, non-technical language, concentration is described in a qualitative way, through the use of adjectives such as "dilute" or "weak" for solutions of relatively low concentration and of others like "concentrated" or "strong" for solutions of relatively high concentration.
The difference between formal and molarconcentrations is that the formal concentration indicates moles of the original chemical formula in solution, without regard for the species that actually exist in solution.
This works fine for gasconcentrations (e.g., ppmv of carbon dioxide in the ambient air) but, for concentrations of non-gaseous substances such as aerosols, cloud droplets, and particulate matter in the ambient air, the concentrations are commonly expressed as μg/m³ or mg/m³ (e.g., μg or mg of particulates per cubic metre of ambient air).
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