regenerative loop
51Direct-conversion receiver — A direct conversion receiver (DCR), also known as homodyne, synchrodyne, or zero IF receiver, is a radio receiver design that demodulates the incoming radio signal using synchronous detection driven by a local oscillator whose frequency is… …
52Brain–computer interface — Neuropsychology Topics Brain computer interface …
53Manchester–Sheffield–Wath electric railway — [v · d · …
54Diesel cycle — Thermodynamics …
55Ecology — For other uses, see Ecology (disambiguation). Ecology …
56Fuel cell — For other uses, see Fuel cell (disambiguation). Demonstration model of a direct methanol fuel cell. The actual fuel cell stack is the layered cube shape in the center of the image A fuel cell is a device that converts the chemical energy from a… …
57Railway brake — A traditional clasp brake: the brake shoe (brown) bears on the surface (tyre) of the wheel (red), and is operated by the levers (grey) on the left …
58Sound recording and reproduction — Sound recorder redirects here. For the audio recording program computer software, see Sound Recorder (Windows). Sound recording and reproduction is an electrical or mechanical inscription and re creation of sound waves, such as spoken voice,… …
59Railroad electrification in the United States — comprised many different systems in many different geographical areas, few of which were connected. Despite this, there were a small number of common reasons for electrification.Streetcars and interurban systems are not within the scope of this… …
60Melbourne — This article is about the Australian metropolis. The name may also refer to the Melbourne City Centre (also known as the Central Business District or CBD ) or the City of Melbourne (the Local Government Area within which the Melbourne City Centre …
