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  2. Aircraft flight dynamics - Wikipedia

    en.wikipedia.org/wiki/Aircraft_flight_dynamics

    Aircraft lack the symmetry between pitch and yaw, so that directional stability in yaw is derived from a different set of stability derivatives. The yaw plane equivalent to the short period pitch oscillation, which describes yaw plane directional stability is called Dutch roll.

  3. Stability theory - Wikipedia

    en.wikipedia.org/wiki/Stability_theory

    In mathematics, stability theory addresses the stability of solutions of differential equations and of trajectories of dynamical systems under small perturbations of initial conditions. The heat equation , for example, is a stable partial differential equation because small perturbations of initial data lead to small variations in temperature ...

  4. Chemical stability - Wikipedia

    en.wikipedia.org/wiki/Chemical_stability

    Thermodynamic stability applies to a particular system. The reactivity of a chemical substance is a description of how it might react across a variety of potential chemical systems and, for a given system, how fast such a reaction could proceed.

  5. Steady state - Wikipedia

    en.wikipedia.org/wiki/Steady_state

    Steady State Stability studies are restricted to small and gradual changes in the system operating conditions. In this we basically concentrate on restricting the bus voltages close to their nominal values. We also ensure that phase angles between two buses are not too large and check for the overloading of the power equipment and transmission ...

  6. Root locus analysis - Wikipedia

    en.wikipedia.org/wiki/Root_locus_analysis

    Spirule. In control theory and stability theory, root locus analysis is a graphical method for examining how the roots of a system change with variation of a certain system parameter, commonly a gain within a feedback system.

  7. Rotamer - Wikipedia

    en.wikipedia.org/wiki/Rotamer

    The energy difference between gauche and anti is 0.9 kcal/mol associated with the strain energy of the gauche conformer. The anti conformer is, therefore, the most stable (≈ 0 kcal/mol). The three eclipsed conformations with dihedral angles of 0°, 120°, and 240° are transition states between conformers. [6]

  8. 1 Social Security Change in 2025 Every Worker Needs to Know - AOL

    www.aol.com/finance/1-social-security-change...

    For many older adults, Social Security makes the difference between enjoying a comfortable retirement and struggling to make ends meet. Working in retirement can be a smart way to create financial ...

  9. Relational dialectics - Wikipedia

    en.wikipedia.org/wiki/Relational_dialectics

    Stabilitychange is "a class of relational dialectics that includes certainty–uncertainty, conventionally–uniqueness, predictability–surprise, and routine–novelty." [11] Things must be consistent but not mundane. There must be a balance between the expected and unexpected in order to keep a relationship.