What is a critical transition point?

From Wikipedia, the free encyclopedia. Critical transitions are abrupt shifts in the state of ecosystems, the climate, financial systems or other complex dynamical systems that may occur when changing conditions pass a critical or bifurcation point.

What is critical slowing?

Critical slowing down refers to the tendency of a system to take longer to return to equilibrium after perturbations, indicated by an increase in signal variance and autocorrelation.

What is aircraft transition point?

The point at which the boundary layer changes from laminar to turbulent is called the transition point. As speed increases, the transition point tends to move forward. As the angle of attack increases, the transition point also tends to move forward.

What is electronic transition point?

[tran′zish·ən ‚pȯint] (electromagnetism) A point at which the constants of a circuit change in such a way as to cause reflection of a wave being propagated along the circuit.

What is stagnation point in aviation?

Stagnation Point. The point on the leading edge of a wing at which the airflow separates, with some flowing over the top of the wing and the rest below the wing. source: FAA Aviation Maintenance Technician Airframe Handbook (FAA-H-8083-31) The point on a surface where the local air velocity is zero.

Why is CP 1 at stagnation point?

The velocity is zero at stagnation points so the pressure around the submerged body is highest at the stagnation points. This pressure is called the stagnation pressure. Stagnation pressure minus static pressure is equal to dynamic pressure; therefore the pressure coefficient Cp at stagnation points is 1.

Is stagnation point always at leading edge?

The stagnation point is always on the lower surface, near the leading edge, at positive angles of attack, and as the angle of attack increases, the stagnation point, and with it the region of ice accumulation, moves aft. ICE BUILDS UP MOST RAPIDLY AROUND THE STAGNATION POINT.

What are some important transitions in life?

Types of life transition Some of the most common ones are: reaching a significant age, e.g. 30, 40, 50, 60; getting married; becoming a parent; leaving university; changing job/losing your job; becoming ill or disabled; being bereaved; and retiring.

What are transition points?

: a single point at which different phases of matter are capable of existing together in equilibrium.

How do I check my stagnation points?

For example, when air is flowing around an airplane wing, there is often a spot just in front of the wing where the airflow is brought to a halt – this is a stagnation point. Given a velocity field, we can find possible stagnation points by equating the velocity components to zero and solving for x and y .

What happens at stagnation point?

In fluid dynamics, a stagnation point is a point in a flow field where the local velocity of the fluid is zero.

What is Scheffer’s theory of critical transitions?

Scheffer, M. Critical Transitions in Nature and Society (Princeton Univ. Press, 2009) This book is an introduction to the theory of critical transitions with examples from ecosystems, climate dynamics and social systems. Wissel, C. A universal law of the characteristic return time near thresholds.

What is an example of a critical transition?

Marten Scheffer accessibly describes the dynamical systems theory behind critical transitions, covering catastrophe theory, bifurcations, chaos, and more. He gives examples of critical transitions in lakes, oceans, terrestrial ecosystems, climate, evolution, and human societies.

What are the best books on critical transitions in ecosystems?

Ecosystems and Human Well-being: Synthesis Report (Island, 2005) Scheffer, M. Critical Transitions in Nature and Society (Princeton Univ. Press, 2009) This book is an introduction to the theory of critical transitions with examples from ecosystems, climate dynamics and social systems. Wissel, C.

What is a critical threshold in a transition?

In models, critical thresholds for such transitions correspond to bifurcations 10. Particularly relevant are ‘catastrophic bifurcations’ (see Box 1 for an example), where, once a threshold is exceeded, a positive feedback propels the system through a phase of directional change towards a contrasting state.