5,651 research outputs found
Exchange operator formalism for an infinite family of solvable and integrable quantum systems on a plane
The exchange operator formalism in polar coordinates, previously considered
for the Calogero-Marchioro-Wolfes problem, is generalized to a recently
introduced, infinite family of exactly solvable and integrable Hamiltonians
, , 2, 3,..., on a plane. The elements of the dihedral group
are realized as operators on this plane and used to define some
differential-difference operators and . The latter serve to
construct -extended and invariant Hamiltonians \chh_k, from which the
starting Hamiltonians can be retrieved by projection in the
identity representation space.Comment: 12 pages, no figure; minor changes; published versio
Survey of CELSS Concepts and Preliminary Research in Japan
Agricultural and other experiments relating to the development of a controlled ecological life support system (CELSS) were proposed. The engineering feasibility of each proposal was investigated by a CELSS experiment concept met study group. The CELSS experiment concept to clarify the goals of CELSS and to determine three phases to achieve the goals. The resulting phases, or missions, and preliminary proposals and studies needed to develop a CELSS are described
Investigating the hard X-ray emission from the hottest Abell cluster A2163 with Suzaku
We present the results from Suzaku observations of the hottest Abell galaxy
cluster A2163 at . To study the physics of gas heating in cluster
mergers, we investigated hard X-ray emission from the merging cluster A2163,
which hosts the brightest synchrotron radio halo. We analyzed hard X-ray
spectra accumulated from two-pointed Suzaku observations. Non-thermal hard
X-ray emission should result from the inverse Compton (IC) scattering of
relativistic electrons by the CMB photons. To measure this emission, the
dominant thermal emission in the hard X-ray band must be modeled in detail. To
this end, we analyzed the combined broad-band X-ray data of A2163 collected by
Suzaku and XMM-Newton, assuming single- and multi-temperature models for
thermal emission and the power-law model for non-thermal emission. From the
Suzaku data, we detected significant hard X-ray emission from A2163 in the
12-60 keV band at the level (or at the level if a
systematic error is considered). The Suzaku HXD spectrum alone is consistent
with the single-T thermal model of gas temperature keV. From the XMM
data, we constructed a multi-T model including a very hot ( keV)
component in the NE region. Incorporating the multi-T and the power-law models
into a two-component model with a radio-band photon index, the 12-60 keV energy
flux of non-thermal emission is constrained within . The 90% upper limit of detected IC
emission is marginal ( in the
12-60 keV). The estimated magnetic field in A2163 is .
While the present results represent a three-fold increase in the accuracy of
the broad band spectral model of A2163, more sensitive hard X-ray observations
are needed to decisively test for the presence of hard X-ray emission due to IC
emission.Comment: 7 pages, 7 figures, A&A accepted. Minor correctio
Sector Sources of Philippine Postwar Economic Growth: The Over-all Record in Comparative Perspective
This paper looks at the Philippine postwar growth within a comparative framework, utilizing the record and experience of ASEAN countries as a background. It also looks into the consequences of the rate and pattern of growth on structural changes, income distribution, savings and other variables. This is in the hope of identifying areas for more detailed research as a next step in the study of postwar development.total factor productivity, services sector, economic growth, agriculture sector, ASEAN, industrial policies
Sector Sources of Philippine Postwar Economic Growth: The Over-all Record in Comparative Perspective
This paper looks at the Philippine postwar growth within a comparative framework, utilizing the record and experience of ASEAN countries as a background. It also looks into the consequences of the rate and pattern of growth on structural changes, income distribution, savings and other variables. This is in the hope of identifying areas for more detailed research as a next step in the study of postwar development.total factor productivity, services sector, economic growth, agriculture sector, ASEAN, industrial policies
Quantum integrability of the deformed elliptic Calogero-Moser problem
The integrability of the deformed quantum elliptic Calogero-Moser problem
introduced by Chalykh, Feigin and Veselov is proven. Explicit recursive
formulae for the integrals are found. For integer values of the parameter this
implies the algebraic integrability of the systems.Comment: 23 page
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