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  2. Fourth grade - Wikipedia

    en.wikipedia.org/wiki/Fourth_grade

    In India, where children enter Class 4 at the ages 9 to 10 it is called Lower Primary, it is known as the fourth grade. 5-7 standard categories as Upper Primary (UP). Lower Primary gives the basic education necessary for a kid and when they get to the UP section, advanced knowledge will be provided via lessons or modules. [citation needed]

  3. Quarter-wave impedance transformer - Wikipedia

    en.wikipedia.org/wiki/Quarter-wave_impedance...

    The quarter wave transformer is an alternative to a stub; but, whereas a stub is terminated in a short (or open) circuit and the length is chosen so as to produce the required impedance transformation, the λ/4 transformer is in series with the load and its length and characteristic impedance are designed to produce the required impedance ...

  4. Quarter 5-cubic honeycomb - Wikipedia

    en.wikipedia.org/wiki/Quarter_5-cubic_honeycomb

    In five-dimensional Euclidean geometry, the quarter 5-cubic honeycomb is a uniform space-filling tessellation (or honeycomb). It has half the vertices of the 5-demicubic honeycomb, and a quarter of the vertices of a 5-cube honeycomb. [1] Its facets are 5-demicubes and runcinated 5-demicubes.

  5. 2nd Battalion, 4th Marines - Wikipedia

    en.wikipedia.org/wiki/2nd_Battalion,_4th_Marines

    2nd Battalion, 4th Marines (2/4) is an infantry battalion of the United States Marine Corps. The battalion, nicknamed the Magnificent Bastards from the Vietnam War, is based out of Marine Corps Base Camp Pendleton , California and is a part of the 4th Marine Regiment and 1st Marine Division .

  6. 4th Special Operations Squadron - Wikipedia

    en.wikipedia.org/wiki/4th_Special_Operations...

    The second predecessor of the squadron was activated at Pope Air Force Base, North Carolina in October 1949 as the 4th Liaison Flight and initially equipped with Stinson L-13 light aircraft. It was expanded to become the 4th Liaison Squadron on 15 July 1952, but was inactivated a week later.

  7. Linear multistep method - Wikipedia

    en.wikipedia.org/wiki/Linear_multistep_method

    Hairer, Ernst; Wanner, Gerhard (1996), Solving ordinary differential equations II: Stiff and differential-algebraic problems (2nd ed.), Berlin, New York: Springer-Verlag, ISBN 978-3-540-60452-5. Iserles, Arieh (1996), A First Course in the Numerical Analysis of Differential Equations , Cambridge University Press, ISBN 978-0-521-55655-2 .

  8. 2,5-Dihydroxy-1,4-benzoquinone - Wikipedia

    en.wikipedia.org/wiki/2,5-Dihydroxy-1,4-benzoquinone

    It is a yellow solid [1] with planar molecules [2] that exhibits ferroelectric properties. [3] The compound is a weak acid: one or both hydroxyls can lose a proton to yield the anions C 6 H 3 O − 4 (pK a1 = 2.95) and C 6 H 2 O 24 (pK a2 = 4.87), respectively. The latter forms a variety of metal complexes, functioning as a binucleating ...

  9. Quartal and quintal harmony - Wikipedia

    en.wikipedia.org/wiki/Quartal_and_quintal_harmony

    In the Middle Ages, simultaneous notes a fourth apart were heard as a consonance.During the common practice period (between about 1600 and 1900), this interval came to be heard either as a dissonance (when appearing as a suspension requiring resolution in the voice leading) or as a consonance (when the root of the chord appears in parts higher than the fifth of the chord).