Impulse excitation technique — PracticalThe impulse excitation technique is a nondestructive test method that uses natural frequency, dimensions and mass of a test piece to determine Young s modulus, Shear modulus, Poisson s ratio and damping coefficient.Dimensions and mass of … Wikipedia
Magnetic field oscillating amplified thruster — The Magnetic Field Oscillating Amplified Thruster (MOA) (often named as Plasma Engine by the media) is a versatile electrothermodynamic system, which is able to accelerate nearly every medium to extremely high velocities, thereby generating a… … Wikipedia
Optical amplifier — An optical amplifier is a device that amplifies an optical signal directly, without the need to first convert it to an electrical signal. An optical amplifier may be thought of as a laser without an optical cavity, or one in which feedback from… … Wikipedia
Dickens, Charles — ▪ British novelist Introduction in full Charles John Huffam Dickens born Feb. 7, 1812, Portsmouth, Hampshire, Eng. died June 9, 1870, Gad s Hill, near Chatham, Kent English novelist, generally considered the greatest of the Victorian era. His … Universalium
Delta-sigma modulation — Delta sigma (ΔΣ; or sigma delta, ΣΔ) modulation is a method for encoding high resolution or analog signals into lower resolution digital signals. The conversion is done using error feedback, where the difference between the two signals is… … Wikipedia
Spacecraft propulsion — A remote camera captures a close up view of a Space Shuttle Main Engine during a test firing at the John C. Stennis Space Center in Hancock County, Mississippi Spacecraft propulsion is any method used to accelerate spacecraft and artificial… … Wikipedia
Gramophone record — A 12 inch (30 cm) 33⅓ rpm record (left), a 7 inch 45 rpm record (right), and a CD (above) A gramophone record, commonly known as a phonograph record (in American English), vinyl record (in reference to vinyl, the material most commonly used after … Wikipedia
gas — gasless, adj. /gas/, n., pl. gases, v., gassed, gassing. n. 1. Physics. a substance possessing perfect molecular mobility and the property of indefinite expansion, as opposed to a solid or liquid. 2. any such fluid or mixture of fluids. 3. any… … Universalium
Europe, history of — Introduction history of European peoples and cultures from prehistoric times to the present. Europe is a more ambiguous term than most geographic expressions. Its etymology is doubtful, as is the physical extent of the area it designates.… … Universalium
Analog signal processing — is any signal processing conducted on analog signals by analog means. Analog indicates something that is mathematically represented as a set of continuous values. This differs from digital which uses a series of discrete quantities to represent… … Wikipedia
Jazz guitar — This article is about the types of guitars and guitar playing styles used in jazz. For performers who play jazz guitar, see jazz guitarist. Hollowbody electric guitars are quite common in jazz; the Gibson ES 175 is a classic example. It has been… … Wikipedia