National Portrait Gallery | National Portrait Gallery (London) | National Portrait Gallery (United States) | National Portrait Gallery, London | portrait | Portrait miniature | National Portrait Gallery (United Kingdom) | phase | A Portrait of the Artist as a Young Man | Henry: Portrait of a Serial Killer | Portrait Records | Portrait of Madame X | Portrait | phase (waves) | Phase-change material | Phase | 2010–11 UEFA Europa League qualifying phase and play-off round | S phase | Portrait of Clare | portrait miniature | phase transition | Phase (game) | Laves phase | Doug Moran National Portrait Prize | donor portrait | Arnolfini Portrait | Three-phase electric power | three-phase | Solid phase extraction | Single-phase electric power |
In this case, a sketch of the phase portrait may give qualitative information about the dynamics of the system, such as the limit cycle of the Van der Pol oscillator shown in the diagram.