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PPD |
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PPD(1) (Parallel Presence Detect) The method used by earlier SIMM memory modules to communicate their capacity to the computer. A binary number coming from a parallel set of pins was read by the system, with each pin representing one bit. Contrast with SPD.
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SDK has also succeeded, using the Hybrid PPD process, in developing blue LEDs with the highest-level brightness on the market today. Nine patients had a positive PPD test, and 2 had previously been vaccinated with BCG, and they did not undergo PPD testing. Nobody saw that negative PPD coming (last spring)," he stresses. |
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