| 释义 |
attractor|əˈtræktə(r)|
Also 7–8 -er.
[Noun of agent (on Latin analogies), f. attract.]
1. That which attracts or draws to itself.
1646Sir T. Browne Pseud. Ep. 81 Amber draweth them not..they cannot rise unto the Attractor. 1713Derham Phys.-Theol. 32 note, Which attraction..of the lesser Bodies to that greater and most prevalent Attracter the Earth, is called their Gravity. 1859Merivale Rom. Emp. V. xli. 65 The seven hills were themselves great attractors of rain.
2. One who draws by sympathy or moral force.
1641Smectymnuus Answ. Humb. Rem. (1653) 90 The chiefe attractor of the rebellious party. 1654Whitlock Mann. Eng. 343 (T.) True attracters of love.
Add:3. Math. A point or set of points in phase space which represents the state or states towards which a dynamic system evolves with time.
1960P. Mendelson in Boletin de la Sociedad Matematica Mexicana V. 274 We have shown thus far that an unstable attractor (and by that is meant a critical point having properties (3.1)) must satisfy the following necessary conditions. 1969R. Thomin Topology VIII. 316 If this point q is such that the trajectory of any point near q goes to q, and no trajectory leaves q, we shall say that q is an attractor of the system. 1976Sci. Amer. Apr. 75/1 An energy minimum in a physical system..is a special instance of a concept called an attractor. In this case it is the simplest kind of attractor, a single stable state. 1987Internat. Jrnl. Non-Linear Mech. XXII. 351 If the attractor is composed of a closed, invariant set of fλ, containing infinitely many unstable periodic groups, then chaotic motion occurs. 1989G. Nicolis in P. Davies New Physics xi. 331/1 The state of equilibrium is a universal point attractor. |