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  2. ptrace - Wikipedia

    en.wikipedia.org/wiki/Ptrace

    ptrace is a system call found in Unix and several Unix-like operating systems. By using ptrace (an abbreviation of "process trace") one process can control another, enabling the controller to inspect and manipulate the internal state of its target. ptrace is used by debuggers and other code-analysis tools, mostly as aids to software development.

  3. Phosphorus - Wikipedia

    en.wikipedia.org/wiki/Phosphorus

    Phosphorus is a chemical element; it has symbol P and atomic number 15. Elemental phosphorus exists in two major forms, white phosphorus and red phosphorus, but because it is highly reactive, phosphorus is never found as a free element on Earth. It has a concentration in the Earth's crust of about one gram per kilogram (compare copper at about ...

  4. Tracing paper - Wikipedia

    en.wikipedia.org/wiki/Tracing_paper

    Tracing paper is paper made to have low opacity, allowing light to pass through. Its origins date back to at least the 1300s where it was used by artists of the Italian Renaissance. [1] In the 1880s, tracing paper was produced en masse, used by architects, design engineers, and artists. [2] Tracing paper was key in creating drawings that could ...

  5. Locard's exchange principle - Wikipedia

    en.wikipedia.org/wiki/Locard's_exchange_principle

    The case studies below show how prevalent Locard's Exchange Principle is in each and every crime. [citation needed] The examples using Locard's Principle show not only how the transfer of trace evidence can tell the tale of what happened, [citation needed] [dubious – discuss] but also how much care is required when collecting and evaluating trace evidence.

  6. P wave (electrocardiography) - Wikipedia

    en.wikipedia.org/wiki/P_wave_(electrocardiography)

    The P wave is a summation wave generated by the depolarization front as it transits the atria. Normally the right atrium depolarizes slightly earlier than left atrium since the depolarization wave originates in the sinoatrial node, in the high right atrium and then travels to and through the left atrium. The depolarization front is carried ...

  7. Isotopes of phosphorus - Wikipedia

    en.wikipedia.org/wiki/Isotopes_of_phosphorus

    Isotopes of phosphorus. Although phosphorus (15 P) has 22 isotopes from 26 P to 47 P, only 31 P is stable; as such, phosphorus is considered a monoisotopic element. The longest-lived radioactive isotopes are 33 P with a half-life of 25.34 days and 32 P with a half-life of 14.268 days. [3][4] All others have half-lives of under 2.5 minutes, most ...

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