Teruhisa Komatsu

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We study the nonequilibrium steady state realized in a general stochastic system attached to multiple heat baths. Starting from the detailed fluctuation theorem, we derive concise and suggestive expressions for the corresponding stationary distribution which are correct up to the second order in thermodynamic forces. The probability of a microstate eta is(More)
Recently a novel concise representation of the probability distribution of heat conducting nonequilibrium steady states was derived. The representation is valid to the second order in the " degree of nonequilibrium " , and has a very suggestive form where the effective Hamiltonian is determined by the excess entropy production. Here we extend the(More)
The Lyapunov exponent for collective motion is defined in order to characterize chaotic properties of collective motion for large populations of chaotic elements. Numerical computations for this quantity suggest that such collective motion is always chaotic, whenever it appears. Chaotic behavior of collective motion is found to be confined within a small(More)
Marine fish generally show higher genetic diversity and shallower population structure than freshwater fish, but data for rare species are lacking. A latid fish, akame (Lates japonicus), is a rare, large predatory fish endemic to Japan, occurring mainly in the estuaries and coastal waters of Kochi and Miyazaki prefectures. Among species of Lates, akame is(More)
The feeding events of wild animals have been widely researched in recent decades. The use of invasive methods to determine stomach contents in which the fish is killed can, however, be considered to be unjustifiable in the case of an endangered fish, such as the Japanese late. Here, we report on a method that can be used to verify feeding events of a fish(More)
Sargassum horneri is one of the most important contributors to the rafts of floating seaweed in the waters off the coasts of northeastern Asia. These rafts serve as spawning and nursery grounds for many marine organisms, including Japanese saury and yellowtail. Thus, the details of the attachment/detachment mechanisms of S. horneri are of commercial(More)