2,799 research outputs found
Quasi-Elastic Reaction and Spin Response Functions of the Deuteron
We calculated response functions of the deuteron for charge exchange
processes, including the final state interaction between two protons. Using
them we evaluated the double differential cross section and polarization
observables of by means of plane wave impulse
approximation with an optimal factorization. Calculation well reproduced the
shape of the energy spectra of the cross section, though somewhat overestimated
the magnitude. It also reproduced the spin observables well.Comment: 19 pages of LaTeX (4 figures not included, hard copy available upon
request), UT-Komaba 93-2
Lowest weight representations of super Schrodinger algebras in low dimensional spacetime
We investigate the lowest weight representations of the super Schrodinger
algebras introduced by Duval and Horvathy. This is done by the same procedure
as the semisimple Lie algebras. Namely, all singular vectors within the Verma
modules are constructed explicitly then irreducibility of the associated
quotient modules is studied again by the use of singular vectors. We present
the classification of irreducible Verma modules for the super Schrodinger
algebras in (1+1) and (2+1) dimensional spacetime with N = 1, 2 extensions.Comment: 10pages, talk given at GROUP28 conference New Castle 26-30th July
2010, reference adde
Neuro-flow Dynamics and the Learning Processes
A new description of the neural activity is introduced by the neuro-flow
dynamics and the extended Hebb rule. The remarkable characteristics of the
neuro-flow dynamics, such as the primacy and the recency effect during
awakeness or sleep, are pointed out.Comment: 8 pages ,10 Postscript figures, LaTeX file, to appear in Chaos,
Solitons and Fractal
Generalized Arcsine Law and Stable Law in an Infinite Measure Dynamical System
Limit theorems for the time average of some observation functions in an
infinite measure dynamical system are studied. It is known that intermittent
phenomena, such as the Rayleigh-Benard convection and Belousov-Zhabotinsky
reaction, are described by infinite measure dynamical systems.We show that the
time average of the observation function which is not the function,
whose average with respect to the invariant measure is finite, converges to
the generalized arcsine distribution. This result leads to the novel view that
the correlation function is intrinsically random and does not decay. Moreover,
it is also numerically shown that the time average of the observation function
converges to the stable distribution when the observation function has the
infinite mean.Comment: 8 pages, 8 figure
Combining Text and Formula Queries in Math Information Retrieval: Evaluation of Query Results Merging Strategies
Specific to Math Information Retrieval is combining text with mathematical
formulae both in documents and in queries. Rigorous evaluation of query
expansion and merging strategies combining math and standard textual keyword
terms in a query are given. It is shown that techniques similar to those known
from textual query processing may be applied in math information retrieval as
well, and lead to a cutting edge performance. Striping and merging partial
results from subqueries is one technique that improves results measured by
information retrieval evaluation metrics like Bpref
Lowest Weight Representations of Super Schrodinger Algebras in One Dimensional Space
Lowest weight modules, in particular, Verma modules over the N = 1,2 super
Schrodinger algebras in (1+1) dimensional spacetime are investigated. The
reducibility of the Verma modules is analyzed via explicitly constructed
singular vectors. The classification of the irreducible lowest weight modules
is given for both massive and massless representations. A vector field
realization of the N = 1, 2 super Schrodinger algebras is also presented.Comment: 19 pages, no figur
Enhancement of the incretin pathway in response to bariatric surgery is important for restoration of beta cell function
ArticleDIABETOLOGIA. 52(2):374-375 (2009)journal articl
Coupled Oscillators with Chemotaxis
A simple coupled oscillator system with chemotaxis is introduced to study
morphogenesis of cellular slime molds. The model successfuly explains the
migration of pseudoplasmodium which has been experimentally predicted to be
lead by cells with higher intrinsic frequencies. Results obtained predict that
its velocity attains its maximum value in the interface region between total
locking and partial locking and also suggest possible roles played by partial
synchrony during multicellular development.Comment: 4 pages, 5 figures, latex using jpsj.sty and epsf.sty, to appear in
J. Phys. Soc. Jpn. 67 (1998
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