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  2. Low-power electronics - Wikipedia

    en.wikipedia.org/wiki/Low-power_electronics

    A Loop Accelerator for Low Power Embedded VLIW Processors by Binu Mathew and Al Davis; Ultra-Low Power Design by Jack Ganssle; K. Roy and S. Prasad, Low-Power CMOS VLSI Circuit Design, John Wiley & Sons, Inc., ISBN 0-471-11488-X, 2000, 359 pages. K-S. Yeo and K. Roy, Low-Voltage Low-Power VLSI Subsystems, McGraw-Hill 2004, ISBN 0-07-143786-X ...

  3. Paschen's law - Wikipedia

    en.wikipedia.org/wiki/Paschen's_law

    This is a substantial fraction of the 7.5 μm spacing between the electrodes for minimal arc voltage. If the electron is in an electric field of 43 MV/m, it will be accelerated and acquire 21.5 eV of energy in 0.5 μm of travel in the direction of the field.

  4. Hardy–Ramanujan–Littlewood circle method - Wikipedia

    en.wikipedia.org/wiki/Hardy–Ramanujan...

    Fractions with the same denominator have circles of the same size. In the special case when the circle method is applied to find the coefficients of a modular form of negative weight, Hans Rademacher found a modification of the contour that makes the series arising from the circle method converge to the exact result.

  5. Rational number - Wikipedia

    en.wikipedia.org/wiki/Rational_number

    In mathematics, "rational" is often used as a noun abbreviating "rational number". The adjective rational sometimes means that the coefficients are rational numbers. For example, a rational point is a point with rational coordinates (i.e., a point whose coordinates are rational numbers); a rational matrix is a matrix of rational numbers; a rational polynomial may be a polynomial with rational ...

  6. Hydrogen-powered aircraft - Wikipedia

    en.wikipedia.org/wiki/Hydrogen-powered_aircraft

    The hydrogen-powered Tu-155 prototype made its first flight on 15 April 1988.. A hydrogen-powered aircraft is an aeroplane that uses hydrogen fuel as a power source. Hydrogen can either be burned in a jet engine or another kind of internal combustion engine, or can be used to power a fuel cell to generate electricity to power an electric propulsor.

  7. Rounding - Wikipedia

    en.wikipedia.org/wiki/Rounding

    Approximating an irrational number by a fraction π: 22/7 1-digit-denominator Approximating a rational number by a fraction with smaller denominator 399 / 941 3 / 7 1-digit-denominator Approximating a fraction by a fractional decimal number: 5 / 3 1.6667: 4 decimal places: Approximating a fractional decimal number by one with fewer digits 2.1784

  8. Dollar (reactivity) - Wikipedia

    en.wikipedia.org/wiki/Dollar_(reactivity)

    Such a rapid power increase can also happen in a real reactor when the chain reaction is sustained without the help of the delayed neutrons. Suppose that the delayed neutron fraction for a particular reactor is 0.00700, or 0.700%. Suppose also that the reactor is highly supercritical and ΔK/K is 0.00700.