Quadrantids filaments modeling
  Numeric integration of orbits of particles along mean orbit of Quadrantid meteor stream is done at time span 20000 years. Orbits are subdivided on several classes by their evolution type. A very complex dynamical behavior is detected. About 20% of modeled particles escape stream: this fact point on that stream cannot be long-live and have a source within 5000 years. After that, Quadrantid filaments dynamics are studied. By comparison of different authors data, 7 independent filaments are selected. Only four of them can have age more than 500 year. Others are unstable or have a small age. Only few Quadrantid filaments can be continuous and observable at all longitudes. Other filaments consist of separate clumps, which occurs number of meteor phenomenon in separate years and non active at different epoch. A complex view of filament dynamical evolution argues in favor multistage ejection particles into a stream at different epoch. 
Alex Rosaev
astro-ph.EP