21,028 research outputs found
An integral transform on a cylinder and the twistor correspondence
Twistor correspondences for R-invariant indefinite self-dual conformal
structures on R^4 are established explicitly. These correspondences are written
down by using a natural integral transform from functions on a two dimensional
cylinder to functions on the flat Lorentz space R^{1,2} which is related to the
wave equation and the Radon transform. A general method on the twistor
construction of indefinite self-dual 4-spaces and indefinite Einstein-Weyl
3-spaces are also summarized.Comment: 15 page
Generation of Whole-Body Expressive Movement Based on Somatical Theories
An automatic choreography method to generate lifelike body movements is proposed. This method is based on somatics theories that are conventionally used to evaluate human’s psychological and developmental states by analyzing the body movement. The idea of this paper is to use the theories in the inverse way: to facilitate generation of artificial body movements that are plausible regarding evolutionary, developmental and emotional states of robots or other non-living movers. This paper reviews somatic theories and describes a strategy for implementations of automatic body movement generation. In addition, a psychological experiment is reported to verify expression ability on body movement rhythm. This method facilitates to choreographing body movement of humanoids, animal-shaped robots, and computer graphics characters in video games
The temperature dependence of quantum spin pumping generated using electron spin resonance with three-magnon splittings
On the basis of the Schwinger-Keldysh formalism, we have closely investigated
the temperature dependence of quantum spin pumping by electron spin resonance.
We have clarified that three-magnon splittings excite non-zero modes of magnons
and characterize the temperature dependence of quantum spin pumping. Our
theoretical result qualitatively agrees with the experiment by Czeschka et al.
that the mixing conductance is little influenced by temperature [F. D. Czeschka
et al., Phys. Rev. Lett., 107, 046601 (2011)].Comment: 16 pages, 5 figures, clear pictures are available at URL specified in
the documen
Global dynamics of cell mediated immunity in viral infection models with distributed delays
In this paper, we investigate global dynamics for a system of delay
differential equations which describes a virus-immune interaction in
\textit{vivo}. The model has two distributed time delays describing time needed
for infection of cell and virus replication. Our model admits three possible
equilibria, an uninfected equilibrium and infected equilibrium with or without
immune response depending on the basic reproduction number for viral infection
and for CTL response such that . It is shown that
there always exists one equilibrium which is globally asymptotically stable by
employing the method of Lyapunov functional. More specifically, the uninfected
equilibrium is globally asymptotically stable if , an infected
equilibrium without immune response is globally asymptotically stable if
and an infected equilibrium with immune response is globally
asymptotically stable if . The immune activation has a positive role
in the reduction of the infection cells and the increasing of the uninfected
cells if .Comment: 16 pages, accepted by Journal of Mathematical Analysis and
Application
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