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  2. Euler's formula - Wikipedia

    en.wikipedia.org/wiki/Euler's_formula

    Euler's formula, named after Leonhard Euler, is a mathematical formula in complex analysis that establishes the fundamental relationship between the trigonometric functions and the complex exponential function. Euler's formula states that, for any real number x, one has. where e is the base of the natural logarithm, i is the imaginary unit, and ...

  3. Thermal desorption spectroscopy - Wikipedia

    en.wikipedia.org/wiki/Thermal_desorption...

    Temperature programmed desorption (TPD) is the method of observing desorbed molecules from a surface when the surface temperature is increased. When experiments are performed using well-defined surfaces of single-crystalline samples in a continuously pumped ultra-high vacuum (UHV) chamber, then this experimental technique is often also referred to as thermal desorption spectroscopy or thermal ...

  4. Roads Policing Unit - Wikipedia

    en.wikipedia.org/wiki/Roads_Policing_Unit

    A roads policing unit (RPU), or a similarly named unit in some forces, is the specialist road traffic police unit of a British police force. Responsibilities [ edit ] RPUs work with the National Police Chiefs' Council roads policing strategy, Policing our Roads Together , [1] which has five strands:

  5. gutta(e) h., h hour: hora: qhs, h.s., hs at bedtime or half strength quaque hora somni ii two tablets duos doses iii three tablets trēs doses n.p.o., npo, NPO nothing by mouth / not by oral administration: nil per os o.d., od, OD right eye. once a day (United Kingdom) oculus dexter omne in die o.s., os, OS left eye: oculus sinister o.u., ou ...

  6. AOL

    login.aol.com

    AOL is a leading online service provider that offers free email, news, entertainment, and more. With AOL, you can access your email from any device, customize your inbox, and enjoy a secure and reliable email experience. Sign in to AOL today and discover the benefits of AOL Mail.

  7. Trump derangement syndrome - Wikipedia

    en.wikipedia.org/wiki/Trump_derangement_syndrome

    Trump derangement syndrome ( TDS) is a pejorative term, usually for criticism or negative reactions to former United States president Donald Trump that are perceived to be irrational and to have little regard towards Trump's actual policy positions, or actions undertaken by his administration. [1] The term has mainly been used by Trump ...

  8. Perpetual usufruct - Wikipedia

    en.wikipedia.org/wiki/Perpetual_usufruct

    Perpetual usufruct (right of perpetual usufruct, RPU) is the English-language term often used by Polish lawyers to describe the Polish version of public ground lease.It is usually granted for 99 years, but never shorter than 40 years, and enables leasehold use of publicly owned land, in most cases located in urban areas.

  9. Total dissolved solids - Wikipedia

    en.wikipedia.org/wiki/Total_dissolved_solids

    Total dissolved solids ( TDS) is a measure of the dissolved combined content of all inorganic and organic substances present in a liquid in molecular, ionized, or micro-granular ( colloidal sol) suspended form. TDS are often measured in parts per million (ppm). TDS in water can be measured using a digital meter.