Takenori Hada

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Nonlinear relations among frequencies and phases in modulational instability of circularly polarized Alfvén waves are discussed, within the context of one dimensional, dissipation-less, unforced fluid system. We show that generation of phase coherence is a natural consequence of the mod-ulational instability of Alfvén waves. Furthermore, we quantitatively(More)
Hypoparathyroidism is known to exhibit various neurological manifestations, but most of the neurological disorders seen in this condition are motor ones, and involuntary movement is rarely encountered. Basal ganglion calcification is a common feature in hypoparathyroidism. But calcification of the cerebral cortex is, to our knowledge, extremely rare with(More)
This study investigated the effects of novelty stress on neuroendocrine activities and running performance in Thoroughbred horses. First, to examine the neuroendocrine responses to novelty stress, we exposed horses to two types of novel environmental stimuli (audiovisual or novel field stimuli). After the stimuli, plasma concentrations of vasopressin,(More)
The cytosol fraction from a thoroughly irrigated canine cerebrum was subjected to immunoaffinity chromatography using a monoclonal antibody against porcine leukocyte 12-lipoxygenase. Arachidonate 12-lipoxygenase eluted from the column with some retardation. The enzyme, with a specific activity of 9 nmol/min/mg of protein, converted arachidonic acid to(More)
  • Y Nariyuki, S Matsukiyo, T Hada
  • 2008
We discuss the parametric instabilities of large-amplitude parallel propagating Alfvén waves using the 2-D PIC simulation code. First, we confirmed the results in the past study [Sakai et al., 2005] that the electrons are heated due to the modified two stream instability and that the ions are heated by the parallel propagating ion acoustic waves. However,(More)
  • L Chian, W M Santana, E L Rempel, F A Borotto, T Hada, Y Kamide
  • 2007
The chaotic dynamics of Alfvén waves in space plasmas governed by the derivative nonlinear Schrödinger equation, in the low-dimensional limit described by stationary spatial solutions, is studied. A bifurcation diagram is constructed, by varying the driver amplitude, to identify a number of nonlinear dynamical processes including saddle-node bifurcation,(More)
  • B T Tsurutani, L D Zhang, G L Mason, G S Lakhina, T Hada, J K Arballo +1 other
  • 2001
Energetic particles and MHD waves are studied using simultaneous ISEE-3 data to investigate particle propagation and scattering between the source near the Sun and 1 AU. 3 He-rich events are of particular interest because they are typically low intensity " scatter-free " events. The largest solar proton events are of interest because they have been(More)
INTRODUCTION Schwannoma is a neoplasm originating from the neural crest cells (schwann cells) that form nerve sheaths. These tumors are thought to be benign with little risk of malignant transformation. They rarely affect the gastrointestinal tract, and primary rectal involvement is extremely rare. Until 2013, only 11 cases of anorectal schwannoma have been(More)
  • Y Nariyuki, T Umeda, T Kumashiro, T Hada
  • 2009
Nonlinear evolution of circularly polarized Alfvén waves are discussed by using the recently developed Vlasov-MHD code, which is a generalized Landau-fluid model. The numerical results indicate that as far as the nonlinearity in the system is not so large, the Vlasov-MHD model can validly solve time evolution of the Alfvénic turbulence both in the linear(More)