71 research outputs found
Socio-economic vulnerability of coastal communities in southern Thailand: The development of adaptation strategies
The tsunami of December 2004 impacted large areas of Thailand's coastline and caused severe human and economic losses. The recovery period revealed differences in the vulnerabilities of communities affected. An understanding of the causal factors of vulnerability is crucial for minimising the negative effects of future threats and developing adaptive capacities. This paper analyses the vulnerabilities and the development of adaptation strategies in the booming tourist area of Khao Lak and in the predominantly fishing and agricultural area of Ban Nam Khem through a comprehensive vulnerability framework. The results show that social networks played a crucial role in coping with the disaster. Social cohesion is important for strengthening the community and developing successful adaptation strategies. The development of tourism and the turning away from traditional activities have a significant positive influence on the income situation, but create a dependency on a single business sector. It could be shown that households generating their income in the tourism sector were vulnerable unless they had diversified their income previously. Income diversification decreased the vulnerability in the study areas. Adaptation strategies and processes developed in the aftermath clearly address these issues
Macdonald Polynomials from Sklyanin Algebras: A Conceptual Basis for the -Adics-Quantum Group Connection
We establish a previously conjectured connection between -adics and
quantum groups. We find in Sklyanin's two parameter elliptic quantum algebra
and its generalizations, the conceptual basis for the Macdonald polynomials,
which ``interpolate'' between the zonal spherical functions of related real and
\--adic symmetric spaces. The elliptic quantum algebras underlie the
\--Baxter models. We show that in the n \air \infty limit, the Jost
function for the scattering of {\em first} level excitations in the
\--Baxter model coincides with the Harish\--Chandra\--like \--function
constructed from the Macdonald polynomials associated to the root system .
The partition function of the \--Baxter model itself is also expressed in
terms of this Macdonald\--Harish\--Chandra\ \--function, albeit in a less
simple way. We relate the two parameters and of the Macdonald
polynomials to the anisotropy and modular parameters of the Baxter model. In
particular the \--adic ``regimes'' in the Macdonald polynomials correspond
to a discrete sequence of XXZ models. We also discuss the possibility of
``\--deforming'' Euler products.Comment: 25 page
Quantum Dynamical Algebra SU(1,1) in One-Dimensional Exactly Solvable Potentials
We mainly explore the linear algebraic structure like SU(2) or SU(1,1) of the
shift operators for some one-dimensional exactly solvable potentials in this
paper. During such process, a set of method based on original diagonalizing
technique is presented to construct those suitable operator elements, J0, J_\pm
that satisfy SU(2) or SU(1,1) algebra. At last, the similarity between radial
problem and one-dimensional potentials encourages us to deal with the radial
problem in the same way.Comment: No figures, 9 Pages accepted by International Journal of Theoretical
Physic
Symmetry scattering for and its applications
In the framework of symmetry scattering, âinvariant differential equations on the homogeneous space are studied. The radial Schrödinger equation for a family of one or two dimensional potentials or for two particles arise. From the asymptotic behavior of the solutions exact partial wave scattering amplitudes are derived
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