Honors Student Research / Creative Works Published and/or Presented
Honors student authors are in bold. These are works prepared while the student was at UAHuntsville.
Abstract: Gonadal condition of the cyprinid stream fish Notropis telescopus (telescope shiner) was monitored from Feb. to Sep. to determine reproductive schedule. The study site was at the southern limit of species range in northeastern Alabama. Notropis species are multiple batch spawners with strong seasonality to gonadal size and condition. The number of maturing oocytes observed in ovaries was at a peak from Apr. to Jul., with strong majorities of oocytes at the most mature stages in Apr., May and Jun. Ripe and fully mature ovaries were found in fish collected in Apr., May and Jun. A pronounced peak in the gonadosomatic index (GSI) was found in Jun. for both males and females. The evidence points to an Alabama spawning season from Apr. to Jul., peaking in the middle of this season.
New experimental results demonstrate that chaos control can be accomplished using controllers that are very simple relative to the system being controlled. Chaotic dynamics in a driven pendulum and a double scroll circuit are controlled using an adjustable, passive limiter—a weight for the pendulum and a diode for the circuit. For both experiments, multiple unstable periodic orbits are selectively controlled using minimal perturbations. These physical examples suggest that chaos control can be practically applied to a much wider array of important problems than initially thought possible.
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