#archivewiki

Dmitri Mendeleev Source: Dmitri Ivanovich Mendeleev[a][b] ( MEN-dəl-AY-əf;[2] 8 February [O.S. 27 January] 1834 – 2 February [O.S. 20 January] 1907) was a Russian chemist known for formulating the periodic

1976 Tehran UFO incident Source: On 19 September 1976, a radar and visual sighting of an unidentified flying object (UFO) occurred over Tehran, the capital of Iran, by civilians and military personnel.

Navier–Stokes equations Source: The Navier–Stokes equations mathematically express momentum balance for Newtonian fluids and make use of the conservation of mass. They are sometimes accompanied by an equation

Leidos Source: Leidos Holdings, Inc. is an American defense, aviation, information technology, and biomedical research company headquartered in Reston, Virginia, that provides scientific, engineering,

Lorentz force Source: Lorentz force acting on fast-moving charged particles in a bubble chamber. Positive and negative charge trajectories curve in opposite directions. In electromagnetism, the Lorentz

American wire gauge Source: American Wire Gauge (AWG) is a logarithmic stepped standardized wire gauge system used since 1857, predominantly in North America, for the diameters of round, solid, nonferrous,

Business cycle Source: Business cycles are intervals of general expansion followed by recession in economic performance. The changes in economic activity that characterize business cycles have important

Floor and ceiling functions Source: For example, for floor: ⌊2.4⌋ = 2, ⌊−2.4⌋ = −3, and for ceiling: ⌈2.4⌉ = 3, and ⌈−2.4⌉ = −2. The floor of x is also called the integral part, integer part, greatest

Kirlian photography Source: In 1889, Czech Bartoloměj Navrátil [cs] coined the word "electrography". Seven years later in 1896, a French experimenter, Hippolyte Baraduc, created electrographs

Electromotive force Source: For two-terminal devices modeled as a Thévenin equivalent circuit, an equivalent emf can be measured as the open-circuit voltage between the two terminals. This emf can drive

Solar eclipse of August 12, 2026 Source: The total eclipse will pass over the Arctic, Greenland, Iceland, the Atlantic Ocean, northern Spain and the extreme northeastern part of Portugal.[3] The points

Malaysia Airlines Flight 370 Source: The crew of the Boeing 777-200ER, registered as 9M-MRO, last communicated with air traffic control (ATC) around 38 minutes after takeoff when the flight was over the

Galvannealed Source: Galvannealed or galvanneal (galvannealed steel) is the result from the processes of galvanizing followed by annealing of sheet steel. Galvannealed steel is a matte uniform grey color,

Tribute in Light Source: The Tribute's illumination begins at dusk and ends at dawn, with the lights being turned off for 20-minute periods to allow migratory birds to escape as needed. On clear nights,

Andrea Booher Source: Booher photographed numerous disasters for FEMA in addition to the September 11 attacks, including floods in the Midwest, Hurricane Andrew, California earthquakes,[6] the Cerro Grande

Michael Faraday Source: As a chemist, Faraday discovered benzene and tetrachloroethylene, investigated the clathrate hydrate of chlorine, invented an early form of the Bunsen burner and the system of oxidation

Abraham Accords Source: The Abraham Accords are a set of agreements that established diplomatic normalization between Israel and several Arab states, beginning with the United Arab Emirates and Bahrain.[1][2]

Hypnic jerk Source: A hypnic jerk is defined as a brief and sudden involuntary contraction of the muscles of the body which occurs when a person is beginning to fall asleep, often causing the person to

Curl (mathematics) Source: Depiction of a two-dimensional vector field with a uniform curl. In vector calculus, the curl, also known as rotor, is a vector operator that describes the infinitesimal circulation

Faraday's law of induction Source: Motional emf, induced by moving a conductor through a magnetic field.Transformer emf, induced by a changing magnetic field. In electromagnetism, Faraday's law of induction