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  2. Hartley oscillator - Wikipedia

    en.wikipedia.org/wiki/Hartley_oscillator

    Hartley oscillator using a common-drain n-channel JFET instead of a tube.. The Hartley oscillator is distinguished by a tank circuit consisting of two series-connected coils (or, often, a tapped coil) in parallel with a capacitor, with an amplifier between the relatively high impedance across the entire LC tank and the relatively low voltage/high current point between the coils.

  3. List of quantum-mechanical systems with analytical solutions

    en.wikipedia.org/wiki/List_of_quantum-mechanical...

    The quantum harmonic oscillator; The quantum harmonic oscillator with an applied uniform field [1] The Inverse square root potential [2] The periodic potential The particle in a lattice; The particle in a lattice of finite length [3] The Pöschl–Teller potential; The quantum pendulum; The three-dimensional potentials The rotating system The ...

  4. Ralph Hartley - Wikipedia

    en.wikipedia.org/wiki/Ralph_Hartley

    Ralph Vinton Lyon Hartley (November 30, 1888 – May 1, 1970) was an American electronics researcher. He invented the Hartley oscillator and the Hartley transform, and contributed to the foundations of information theory. His legacy includes the naming of the hartley, a unit of information equal to one decimal digit, after him.

  5. File:Oscillator hartley opamp.svg - Wikipedia

    en.wikipedia.org/wiki/File:Oscillator_hartley...

    Oscillateur Hartley; Usage on fr.wikibooks.org Électronique/Version imprimable; Électronique/Les oscillateurs (générateurs de fréquence) Usage on vi.wikibooks.org Sách Điện Tử/Chương 3 Bộ phận điện tử/Bộ Dao Động Sóng Điện Tử/Sóng Điện Tử/Bộ Dao Động Sóng Sin/Hartley oscillator; Usage on zh.wikipedia.org

  6. Method of averaging - Wikipedia

    en.wikipedia.org/wiki/Method_of_averaging

    It turns out to be a customary problem where there exists the trade off between how good is the approximated solution balanced by how much time it holds to be close to the original solution. More precisely, the system has the following form x ˙ = ε f ( x , t , ε ) , 0 ≤ ε ≪ 1 {\displaystyle {\dot {x}}=\varepsilon f(x,t,\varepsilon ...

  7. Discrete Hartley transform - Wikipedia

    en.wikipedia.org/wiki/Discrete_Hartley_transform

    Formally, the discrete Hartley transform is a linear, invertible function H: R n → R n (where R denotes the set of real numbers).The N real numbers x 0, ..., x N−1 are transformed into the N real numbers H 0, ..., H N−1 according to the formula

  8. 10 Hard Math Problems That Even the Smartest People in the ...

    www.aol.com/10-hard-math-problems-even-150000090...

    Here’s another problem that’s very easy to write, but hard to solve. All you need to recall is the definition of rational numbers. Rational numbers can be written in the form p/q, where p and ...

  9. Rabi problem - Wikipedia

    en.wikipedia.org/wiki/Rabi_problem

    The Rabi problem concerns the response of an atom to an applied harmonic electric field, with an applied frequency very close to the atom's natural frequency. It provides a simple and generally solvable example of light–atom interactions and is named after Isidor Isaac Rabi.