isochronとは 意味・読み方・使い方

語源

iso- +‎ chron.

名詞

isochron (複数形 isochrons)

1. (geology, geochemistry) A line on a chart linking rock of the same age (as determined from isotope ratios).
   • 1997, H.-G. Attendorn, R. Bowen, Radioactive and Stable Isotope Geology, Chapman & Hall, page 163,

     Recapitulating, any suite of comagmatic rocks with an age ${\displaystyle t}$ defines an isochron if its members all had the same initial ${\displaystyle {\ce {^{87}Sr/^{86}Sr}}}$ ratio and if it was closed to both ${\displaystyle {\ce {Rb}}}$ and ${\displaystyle {\ce {Sr}}}$ since crystallization occurred and neither element was introduced from any extraneous source. […] In this way, whole-rock ${\displaystyle {\ce {Rb-Sr}}}$ isochrons can produce rather reliable age data for rock samples.

2. (mathematics, dynamical systems) A collection of points (such as a manifold), each point representing a set of initial conditions for a given dynamical system, such that every set results in the same long-term behaviour of the system.
   • 2007, Eugene M. Izhikevich, Dynamical Systems in Neuroscience, The MIT Press, page 446,

     The entire plane is foliated by isochrons.

派生語

• isochron dating
• isochron diagram

関連する語

• isochronism
• isochronous
• isochrony

参考

• isochrone

Further reading

• Isochron on Wikipedia.(数学)
• Isochron dating on Wikipedia.

アナグラム

• chorions