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  2. Cissoid of Diocles - Wikipedia

    en.wikipedia.org/wiki/Cissoid_of_Diocles

    Cissoid of Diocles traced by points M with ¯ = ¯ Animation visualizing the Cissoid of Diocles. In geometry, the cissoid of Diocles (from Ancient Greek κισσοειδής (kissoeidēs) 'ivy-shaped'; named for Diocles) is a cubic plane curve notable for the property that it can be used to construct two mean proportionals to a given ratio.

  3. Western Maryland Scenic Railroad 1309 - Wikipedia

    en.wikipedia.org/wiki/Western_Maryland_Scenic...

    The restoration had cost $1.8 million as of mid-2018, including $800,000 provided by the state of Maryland. [21] The Western Maryland Scenic General Manager estimated the final cost would be $2.4 million. [23] In September 2019, the project was again halted due to a lack of funds shortly after the front drivers were attached to the engine. [24]

  4. Davenport chained rotations - Wikipedia

    en.wikipedia.org/wiki/Davenport_chained_rotations

    Image 1: Davenport possible axes for steps 1 and 3 given Z as the step 2. The general problem of decomposing a rotation into three composed movements about intrinsic axes was studied by P. Davenport, under the name "generalized Euler angles", but later these angles were named "Davenport angles" by M. Shuster and L. Markley.

  5. Conversion between quaternions and Euler angles - Wikipedia

    en.wikipedia.org/wiki/Conversion_between...

    The resulting orientation of Body 3-2-1 sequence (around the capitalized axis in the illustration of Tait–Bryan angles) is equivalent to that of lab 1-2-3 sequence (around the lower-cased axis), where the airplane is rolled first (lab-x axis), and then nosed up around the horizontal lab-y axis, and finally rotated around the vertical lab-z ...

  6. Proofs of trigonometric identities - Wikipedia

    en.wikipedia.org/wiki/Proofs_of_trigonometric...

    For the sine function, we can handle other values. If θ > π /2, then θ > 1. But sin θ ≤ 1 (because of the Pythagorean identity), so sin θ < θ. So we have ⁡ < <. For negative values of θ we have, by the symmetry of the sine function

  7. Orders of magnitude (pressure) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(pressure)

    1.5 psi Pressure increase per meter of a water column [26] 10 kPa 1.5 psi Decrease in air pressure when going from Earth sea level to 1000 m elevation [citation needed] +13 kPa +1.9 psi High air pressure for human lung, measured for trumpet player making staccato high notes [48] < +16 kPa +2.3 psi

  8. Dihedral angle - Wikipedia

    en.wikipedia.org/wiki/Dihedral_angle

    If the points are sequentially numbered and located at positions r 1, r 2, r 3, etc. then bond vectors are defined by u 1 = r 2 − r 1, u 2 = r 3 − r 2, and u i = r i+1 − r i, more generally. [2] This is the case for kinematic chains or amino acids in a protein structure. In these cases, one is often interested in the half-planes defined ...

  9. Stokes parameters - Wikipedia

    en.wikipedia.org/wiki/Stokes_parameters

    The Stokes I, Q, U and V parameters. The Stokes parameters are a set of values that describe the polarization state of electromagnetic radiation.They were defined by George Gabriel Stokes in 1851, [1] [2] as a mathematically convenient alternative to the more common description of incoherent or partially polarized radiation in terms of its total intensity (I), (fractional) degree of ...