2,616 research outputs found
Determination of Boundary Scattering, Intermagnon Scattering, and the Haldane Gap in Heisenberg Chains
Low-lying magnon dispersion in a S=1 Heisenberg antiferromagnetic (AF) chain
is analyzed using the non-Abelian DMRG method. The scattering length of the boundary coupling and the inter-magnon scattering length are
determined. The scattering length is found to exhibit a
characteristic diverging behavior at the crossover point. In contrast, the
Haldane gap , the magnon velocity , and remain constant at the
crossover. Our method allowed estimation of the gap of the S=2 AF chain to be
using a chain length longer than the correlation length
.Comment: 6 pages, 3 figures, 1 table, accepted in Phys. Rev.
Recent biotelemetry research on lacustrine salmon homing migration
One of the most interesting aspects of the salmon\u27s life history and the most challenging to study is the homing migration during which the fish return from their oceanic feeding grounds to the natal river to spawn. However, because of the difficulties encountered in studying the movements of fish, particularly in the sea, there is still very little information regarding this phase in the life cycle of the salmon. Lake Toya in Hokkaido, Japan supports populations of both lacustrine sockeye salmon (Onchorynchus nerka) and masu salmon (O. masou). The lake provides an ideal model for an "oceanic system" where the physiological and behavioral basis of the homing migrations of salmon can be studied. Previously a number of studies have been undertaken in Lake Toya using biotelemetry techniques to investigate and describe the homing migratory behavior of mature and sockeye salmon. The three principal biotelemetry techniques that have been utilized include ultrasonic telemetry, electromyographic telemetry and micro data logging telemetry. Each of these techniques has been shown to have advantages and disadvantages in describing the movements of adult salmon. Therefore, it was decided to combine all three techniques in a single system and develop a robotic tracking platform (robot boat) that encompassed three interrelated telemetry systems, acoustic telemetry, a signal processing system and a telecommunication system for transmission of data between the boat and a land based station. This review describes the new technology that has provided the opportunity to investigate the physiological and behavioral basis of salmon homing migration using the unique Lake Toya lacustrine salmon model
Current Issues in Dementia and Dementia Care in Japan
Current issues in dementia and dementia care in East Asi
New Approaches to Get the Property of Quantum Spin Systems in the Thermodynamic Limit(New Development of Numerical Simulations in Low-Dimensional Quantum Systems: From Density Matrix Renormalization Group to Tensor Network Formulations)
この論文は国立情報学研究所の電子図書館事業により電子化されました
The General Public’s Awareness of the Importance of Oral Health : Findings from a Community Survey in Japan
The utilization of GIS in gerontology : Potential applications and ease of geografic information creation
Governor leads country with pioneering secondhand smoke prevention ordinance : challenges faced by Kanagawa prefecture, Japan
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