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  2. Bose–Hubbard model - Wikipedia

    en.wikipedia.org/wiki/Bose–Hubbard_model

    [2] [3] [4] The Bose–Hubbard model can be used to describe physical systems such as bosonic atoms in an optical lattice , [ 5 ] as well as certain magnetic insulators. [ 6 ] [ 7 ] Furthermore, it can be generalized and applied to Bose–Fermi mixtures, in which case the corresponding Hamiltonian is called the Bose–Fermi–Hubbard Hamiltonian.

  3. Piping and instrumentation diagram - Wikipedia

    en.wikipedia.org/wiki/Piping_and_instrumentation...

    Piping and instrumentation diagram of pump with storage tank. Symbols according to EN ISO 10628 and EN 62424. A more complex example of a P&ID. A piping and instrumentation diagram (P&ID) is defined as follows: A diagram which shows the interconnection of process equipment and the instrumentation used to control the process.

  4. Thermal conductivity measurement - Wikipedia

    en.wikipedia.org/wiki/Thermal_conductivity...

    Note that the first two terms in the brackets on the RHS are constants. Thus if the probe temperature is plotted versus the natural logarithm of time, the thermal conductivity can be determined from the slope given knowledge of Q. Typically this means ignoring the first 60 to 120 seconds of data and measuring for 600 to 1200 seconds.

  5. T-carrier - Wikipedia

    en.wikipedia.org/wiki/T-carrier

    The T-carrier is a hardware specification for carrying multiple time-division multiplexed (TDM) telecommunications channels over a single four-wire transmission circuit. It was developed by AT&T at Bell Laboratories ca. 1957 and first employed by 1962 for long-haul pulse-code modulation (PCM) digital voice transmission with the D1 channel bank.

  6. Lagrangian mechanics - Wikipedia

    en.wikipedia.org/wiki/Lagrangian_mechanics

    Kinetic energy T is the energy of the system's motion and is a function only of the velocities v k, not the positions r k, nor time t, so T = T(v 1, v 2, ...). V , the potential energy of the system, reflects the energy of interaction between the particles, i.e. how much energy any one particle has due to all the others, together with any ...

  7. ATM - Wikipedia

    en.wikipedia.org/wiki/ATM

    This is an accepted version of this page This is the latest accepted revision, reviewed on 1 January 2025. Electronic telecommunications device to perform financial transactions Several terms redirect here. For other uses, see Cash machine (disambiguation), Money machine (disambiguation), and ATM (disambiguation). An old Nixdorf ATM Smaller indoor ATMs dispense money inside convenience stores ...

  8. Uncertainty principle - Wikipedia

    en.wikipedia.org/wiki/Uncertainty_principle

    where = is the reduced Planck constant.. The quintessentially quantum mechanical uncertainty principle comes in many forms other than position–momentum. The energy–time relationship is widely used to relate quantum state lifetime to measured energy widths but its formal derivation is fraught with confusing issues about the nature of time.

  9. Curved spacetime - Wikipedia

    en.wikipedia.org/wiki/Curved_spacetime

    However, the repulsive electromagnetic pressures resulting from protons being tightly squeezed inside atomic nuclei are typically on the order of 10 28 atm ≈ 10 33 Pa ≈ 10 33 kg·s −2 m −1. This amounts to about 1% of the nuclear mass density of approximately 10 18 kg/m 3 (after factoring in c 2 ≈ 9×10 16 m 2 s −2). [19]

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