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  2. Proportional–integral–derivative controller - Wikipedia

    en.wikipedia.org/wiki/Proportional–integral...

    This is achieved by setting the unused parameters to zero and is called a PI, PD, P, or I controller in the absence of the other control actions. PI controllers are fairly common in applications where derivative action would be sensitive to measurement noise, but the integral term is often needed for the system to reach its target value.

  3. Singlish vocabulary - Wikipedia

    en.wikipedia.org/wiki/Singlish_vocabulary

    stay on topic – (Western English) meaning to tell the person not to change the subject. E.g. "oi, stay on topic lah you!" (meaning "this is not relevant") steady pom pi pi — (From Unknown) Used to describe someone who keeps their cool under pressure or in the face of a massive crisis. suay – (From Hokkien/Teochew 衰 soe) Unlucky. [45]

  4. List of mathematical constants - Wikipedia

    en.wikipedia.org/wiki/List_of_mathematical_constants

    A mathematical constant is a key number whose value is fixed by an unambiguous definition, often referred to by a symbol (e.g., an alphabet letter), or by mathematicians' names to facilitate using it across multiple mathematical problems. [1]

  5. Power integrity - Wikipedia

    en.wikipedia.org/wiki/Power_integrity

    Power integrity or PI involves a series of electronic engineering efforts aimed at ensuring that power supply subsystems adequately support the performance of an entire electronic system [1]. PI engineering focuses on designing and evaluating power supply subsystems to prevent any degradation in system performance due to potential adverse ...

  6. What's Pi Day all about? Math, science, pies and more - AOL

    www.aol.com/news/whats-pi-day-math-science...

    Math enthusiasts around the world, from college kids to rocket scientists, celebrate Pi Day on Thursday, which is March 14 or 3/14 — the first three digits of an infinite number with many ...

  7. Pi - Wikipedia

    en.wikipedia.org/wiki/Pi

    The number π (/ p aɪ /; spelled out as "pi") is a mathematical constant that is the ratio of a circle's circumference to its diameter, approximately equal to 3.14159.It appears in many formulae across mathematics and physics, and some of these formulae are commonly used for defining π, to avoid relying on the definition of the length of a curve.

  8. The Fed keeps interest rates steady. What does that mean for ...

    www.aol.com/fed-keeps-interest-rates-steady...

    The Federal Reserve can influence home mortgage rates, but that’s not the only factor in the state’s housing affordability challenge.

  9. List of formulae involving π - Wikipedia

    en.wikipedia.org/wiki/List_of_formulae_involving_π

    where C is the circumference of a circle, d is the diameter, and r is the radius.More generally, = where L and w are, respectively, the perimeter and the width of any curve of constant width.