pulse switching apparatus
31DAMP Project — The Downrange Anti missile Measurement Program or DAMP was an applied research project to obtain scientific data, just prior to and during re entry, on intermediate and intercontinental range ballistic missiles as they returned to earth. The… …
32Physical Sciences — ▪ 2009 Introduction Scientists discovered a new family of superconducting materials and obtained unique images of individual hydrogen atoms and of a multiple exoplanet system. Europe completed the Large Hadron Collider, and China and India took… …
33photography, technology of — Introduction equipment, techniques, and processes used in the production of photographs. The most widely used photographic process is the black and white negative–positive system (Figure 1 >). In the camera the lens projects an image of… …
34Uninterruptible power supply — A small free standing UPS …
35Power line communication — or power line carrier (PLC), also known as power line digital subscriber line (PDSL), mains communication, power line telecom (PLT), power line networking (PLN), or broadband over power lines (BPL) are systems for carrying data on a conductor… …
36Token (railway signalling) — A token being offered by a signalman on the Keighley and Worth Valley Railway …
37Radio — is the transmission of signals, by modulation of electromagnetic waves with frequencies below those of visible light.Electromagnetic radiation travels by means of oscillating electromagnetic fields that pass through the air and the vacuum of… …
38Teleprinter — A teleprinter (teletypewriter, Teletype or TTY for TeleTYpe/TeleTYpewriter) is a now largely obsolete electro mechanical typewriter which can be used to communicate typed messages from point to point and point to multipoint over a variety of… …
39Gas turbine — Microturbine redirects here. For turbines in electricity, see Small wind turbine. For turbines driven by the flow of gas, see Turbine. A typical axial flow gas turbine turbojet, the J85, sectioned for display. Flow is left to right, multistage… …
40Maglev — JR Maglev at Yamanashi, Japan test track in November 2005 …
