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  2. Error correction model - Wikipedia

    en.wikipedia.org/wiki/Error_correction_model

    The first term in the RHS describes short-run impact of change in on , the second term explains long-run gravitation towards the equilibrium relationship between the variables, and the third term reflects random shocks that the system receives (e.g. shocks of consumer confidence that affect consumption). To see how the model works, consider two ...

  3. Cuboctahedron - Wikipedia

    en.wikipedia.org/wiki/Cuboctahedron

    In other words, it has the same length vectors in three-dimensional space, known as vector equilibrium. [8] The rigid struts and the flexible vertices of a cuboctahedron may also be transformed progressively into a regular icosahedron, regular octahedron, regular tetrahedron. Fuller named this the jitterbug transformation. [9]

  4. Free body diagram - Wikipedia

    en.wikipedia.org/wiki/Free_body_diagram

    A force arrow should lie along the line of force, but where along the line is irrelevant. A force on an extended rigid body is a sliding vector. non-rigid extended. The point of application of a force becomes crucial and has to be indicated on the diagram. A force on a non-rigid body is a bound vector. Some use the tail of the arrow to indicate ...

  5. Phase plane - Wikipedia

    en.wikipedia.org/wiki/Phase_plane

    In applied mathematics, in particular the context of nonlinear system analysis, a phase plane is a visual display of certain characteristics of certain kinds of differential equations; a coordinate plane with axes being the values of the two state variables, say (x, y), or (q, p) etc. (any pair of variables).

  6. Equilibrant force - Wikipedia

    en.wikipedia.org/wiki/Equilibrant_Force

    Because the angle of the equilibrant force is opposite of the resultant force, if 180 degrees are added or subtracted to the resultant force's angle, the equilibrant force's angle will be known. Multiplying the resultant force vector by a -1 will give the correct equilibrant force vector: <-10, -8>N x (-1) = <10, 8>N = C.

  7. Kirchhoff–Love plate theory - Wikipedia

    en.wikipedia.org/wiki/Kirchhoff–Love_plate_theory

    Deformation of a thin plate highlighting the displacement, the mid-surface (red) and the normal to the mid-surface (blue) The Kirchhoff–Love theory of plates is a two-dimensional mathematical model that is used to determine the stresses and deformations in thin plates subjected to forces and moments.

  8. Detailed balance - Wikipedia

    en.wikipedia.org/wiki/Detailed_balance

    A Markov process is called a reversible Markov process or reversible Markov chain if there exists a positive stationary distribution π that satisfies the detailed balance equations [13] =, where P ij is the Markov transition probability from state i to state j, i.e. P ij = P(X t = j | X t − 1 = i), and π i and π j are the equilibrium probabilities of being in states i and j, respectively ...

  9. Flexibility method - Wikipedia

    en.wikipedia.org/wiki/Flexibility_method

    The vector X is the so-called vector of redundant forces and I is the degree of statical indeterminacy of the system. We usually choose j , k , …, α {\displaystyle \alpha } , and β {\displaystyle \beta } such that X i {\displaystyle X_{i}} is a support reaction or an internal member-end force.