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  2. Photoconductance decay - Wikipedia

    en.wikipedia.org/wiki/Photoconductance_decay

    PCD uses a fast light source (e.g. a xenon flash lamp) to excite the test sample, causing free carriers to be generated. Excess carriers in the material cause it to become more conductive, and thus the number of excess carriers can be measured over time by measuring the material conductivity.

  3. Bolt circle - Wikipedia

    en.wikipedia.org/wiki/Bolt_circle

    A bolt circle diameter or pitch circle diameter (PCD), sometimes simply called bolt circle or pitch circle, is a common term for when a number of screw holes for bolts are evenly distributed with their centers along an imaginary circle with a given diameter.

  4. Photon-counting computed tomography - Wikipedia

    en.wikipedia.org/wiki/Photon-counting_computed...

    A PCD can implement more than two energy thresholds with a higher degree of separation than what is possible to achieve in dual-energy CT. This improvement in energy resolution translates to higher contrast-to-noise ratio in the image, in particular in contrast-enhanced and material-selective images.

  5. Wheel sizing - Wikipedia

    en.wikipedia.org/wiki/Wheel_sizing

    This number will vary depending on the number of lugs, the PCD, the material used and the type of axle the wheel is used on. A wheel used on a free rolling trailer axle will carry more weight than that same wheel used on the drive or steering axle of a vehicle. All wheels will have the load capacity stamped on the back of the wheel.

  6. Programmed cell death - Wikipedia

    en.wikipedia.org/wiki/Programmed_cell_death

    Programmed cell death (PCD; sometimes referred to as cellular suicide [1]) is the death of a cell as a result of events inside of a cell, such as apoptosis or autophagy. [ 2 ] [ 3 ] PCD is carried out in a biological process , which usually confers advantage during an organism's lifecycle .

  7. Percentage depth dose curve - Wikipedia

    en.wikipedia.org/wiki/Percentage_depth_dose_curve

    In radiotherapy, a percentage depth dose curve (PDD) (sometimes percent depth dose curve) relates the absorbed dose deposited by a radiation beam into a medium as it varies with depth along the axis of the beam.

  8. New York’s governor said congestion pricing would hurt the ...

    www.aol.com/york-governor-said-congestion...

    New York was just a few weeks away from becoming the first American city to adopt congestion pricing, a system designed to alleviate traffic, reduce air pollution and fund public transit. Then, at ...

  9. Zeiss formula - Wikipedia

    en.wikipedia.org/wiki/Zeiss_formula

    In photographic optics, the Zeiss formula is a supposed formula for computing a circle of confusion (CoC) criterion for depth of field (DoF) calculations. The formula is c = d / 1730 {\displaystyle c=d/1730} , where d {\displaystyle d} is the diagonal measure of a camera format, film, sensor, or print, and c {\displaystyle c} the maximum ...

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