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Golden mussel Limnoperna
fortunei(Dunker 1857) is a filter-collector species of fresh water mussel
originating from southern China. In the water transfer tunnels from the East
River to Shenzhen and Hong Kong, golden mussels attach to the walls of
pipelines and gates, causing serious biofouling, increased flow resistance, and
resulted in corrosion of the tunnel wall. Golden mussel has very high
environmental adaptability and may colonize habitats with low dissolved oxygen
and a wide range of trophic levels. The colonization process of the species on
solid surface was studied in the Xizhijiang River, a tributary of the East
River and the main water resource of Shenzhen from March 2010 to April 2011.
The results showed that the golden mussel completed three generations and
reproduced six cohorts per year in the tropic zone. Water temperature was the
controlling factor for the growth rate and maturity of each cohort. Based on
the results, an ecological method for controlling the invasion of golden
mussels in water transfer tunnels was proposed.
Beginning with a Lagrangian, we derived an approximate relativistic
orbit equation which describes relativistic corrections to Keplerian
orbits. The critical angular moment to guarantee the existence of periodic
orbits is determined. An approximate relativistic Kepler’s elliptic orbit is
illustrated by numerical simulation via a second-order perturbation method of averaging.