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  2. Raised-cosine filter - Wikipedia

    en.wikipedia.org/wiki/Raised-cosine_filter

    The raised-cosine filter is a filter frequently used for pulse-shaping in digital modulation due to its ability to minimise intersymbol interference (ISI). Its name stems from the fact that the non-zero portion of the frequency spectrum of its simplest form (=) is a cosine function, 'raised' up to sit above the (horizontal) axis.

  3. List of national parks of Costa Rica - Wikipedia

    en.wikipedia.org/wiki/List_of_national_parks_of...

    A UNESCO World Heritage Site, Cocos Island is 550 km (340 mi) off the Pacific Ocean coast of Costa Rica and features marine life, evergreen forests, and waterfalls. [13] Corcovado: 41,788 ha (103,260 acres)

  4. United States military occupation code - Wikipedia

    en.wikipedia.org/wiki/United_States_military...

    The first four code symbols were made up of a two-digit code for the career field, a letter code for the field specialty, and a number code (1 to 5) indicating level of instruction in their field specialty. The fifth code symbol was an SQI code letter indicating training in a special skill (the letter "O" indicating that the soldier had no SQI).

  5. Polytetrafluoroethylene - Wikipedia

    en.wikipedia.org/wiki/Polytetrafluoroethylene

    Polytetrafluoroethylene is a fluorocarbon solid, as it is a high-molecular-weight polymer consisting wholly of carbon and fluorine.PTFE is hydrophobic: neither water nor water-containing substances wet PTFE, as fluorocarbons exhibit only small London dispersion forces due to the low electric polarizability of fluorine.

  6. List of largest daily changes in the S&P 500 Index - Wikipedia

    en.wikipedia.org/wiki/List_of_largest_daily...

    Download QR code; Wikidata item; Print/export ... This is a list of the largest daily changes in the S &P 500 from 1923. Compare to the ... 10.50 +0.79 +8.14 19 1932 ...

  7. Duty cycle - Wikipedia

    en.wikipedia.org/wiki/Duty_cycle

    In digital electronics, signals are used in rectangular waveform which are represented by logic 1 and logic 0. Logic 1 stands for presence of an electric pulse and 0 for absence of an electric pulse. For example, a signal (10101010) has 50% duty cycle, because the pulse remains high for 1/2 of the period or low for 1/2 of the period.

  8. Median lethal dose - Wikipedia

    en.wikipedia.org/wiki/Median_lethal_dose

    In toxicology, the median lethal dose, LD 50 (abbreviation for "lethal dose, 50%"), LC 50 (lethal concentration, 50%) or LCt 50 is a toxic unit that measures the lethal dose of a given substance. [1] The value of LD 50 for a substance is the dose required to kill half the members of a tested population after a specified test duration.

  9. Congresswomen press FDA on why a proposal to ban hair ...

    www.aol.com/lifestyle/congresswomen-press-fda...

    A 2023 study from Boston University found that postmenopausal women who used relaxers most often had a greater than 50% increased risk of uterine cancer compared to those who seldom used them.

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