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1 day ago · Quantum mechanics. Matter waves are a central part of the theory of quantum mechanics, being half of wave–particle duality. At all scales where measurements have been practical, matter exhibits wave -like behavior. For example, a beam of electrons can be diffracted just like a beam of light or a water wave.
1 day ago · History Early history. The hypothesis of dark matter has an elaborate history. In the appendices of the book Baltimore lectures on molecular dynamics and the wave theory of light where the main text was based on a series of lectures given in 1884, Lord Kelvin discussed the potential number of stars around the Sun from the observed velocity dispersion of the stars near the Sun, assuming that ...
1 day ago · A Soyuz-FG rocket launches from "Gagarin's Start" (Site 1/5), Baikonur Cosmodrome A rocket (from Italian: rocchetto, lit. 'bobbin/spool') [nb 1] is a vehicle that uses jet propulsion to accelerate without using any surrounding air. A rocket engine produces thrust by reaction to exhaust expelled at high speed. Rocket engines work entirely from propellant carried within the vehicle; therefore a ...
12 minutes ago · 2.2.3 Airborne Millimeter Wave FMCW SAR Measured Data Processing. The previous research on the imaging algorithm of airborne millimeter wave FMCW SAR assumes that the motion state of the carrier is ideal, that is, the carrier moves in a straight line parallel to the ground at a fixed direction and a constant speed, for the convenience of analysis.
12 minutes ago · Wide swath and high resolution are the eternal pursuit of SAR, and they are also a pair of contradictory quantities. For wide-swath observation requirements, it is difficult to obtain good antenna gain in the entire width due to factors such as the broadening of the main lobe of the antenna pattern and the restriction of range ambiguity on the long-time modulated signal, thereby reducing the ...
1 day ago · Robotics is the interdisciplinary study and practice of the design, construction, operation, and use of robots. [1] Within mechanical engineering, robotics is the design and construction of the physical structures of robots, while in computer science, robotics focuses on robotic automation algorithms. Other disciplines contributing to robotics ...
1 day ago · Columbia University, officially Columbia University in the City of New York, is a private, Ivy League, research university in New York City.Established in 1754 as King's College on the grounds of Trinity Church in Manhattan, it is the oldest institution of higher education in New York and the fifth-oldest in the United States and is considered one of the most prestigious universities in the world.
