2,212 research outputs found
A Turning Point: past and future of the European Community's relations with Eastern Europe. Biblio-Flash No 24, 1989
The signature on 25 June 1988 in Luxembourg of the EEC-CMEA
(1) Joint Declaration, of which a text is annexed to this article,
marked the establishment of official relations between the European
Community and the CMEA and at the same time gave the impetus
for the normalization of bilateral relations between the Community
and the individual East European countries members of the CMEA
Asymmetric hypersonic flow
A general method for the analysis of the inviscid asymmetric hypersonic flow fields enveloping smooth bodies of general shape is given. The method is based on the assumption of a thin shock layer which yields an expression for pressure in generalized Mises coordinates. Numerical results for elliptic cones at angle of attack are shown to compare well with experiments and other theories. The computing logic for a blunt body is described, and a limiting solution at the stagnation point is presented
Ground state energy and mass gap of a generalised quantum spin ladder
We show that a 2-leg ladder hamiltonian introduced recently by Albeverio and
Fei (cond-mat/9807341) can be made to satisfy the Hecke algebra. As a result we
have found an equivalent representation of the eigenspectrum in terms of the
spin-1/2 antiferromagnetic XXZ chain at . The values of
thermodynamic quantities such as the ground state energy and mass gap follow
from the known XXZ results.Comment: 8 pages, Late
Inviscid flow about blunted cones of large opening angle at angle of attack
Application of a general method for calculation of inviscid hypersonic flow fields is discussed. General considerations are analyzed along with the sonic corner and the stagnation region. It is concluded that the complications caused by the requirement for sonic flow at the rear corner and particularly by the uncertain position of the stagnation streamline lead to sufficient difficulties with convergence of iterations that a practical procedure is not likely to be found
Separation of Variables and the Computation of Fourier Transforms on Finite Groups, II
We present a general diagrammatic approach to the construction of efficient
algorithms for computing the Fourier transform of a function on a finite group.
By extending work which connects Bratteli diagrams to the construction of Fast
Fourier Transform algorithms %\cite{sovi}, we make explicit use of the path
algebra connection to the construction of Gel'fand-Tsetlin bases and work in
the setting of quivers. We relate this framework to the construction of a {\em
configuration space} derived from a Bratteli diagram. In this setting the
complexity of an algorithm for computing a Fourier transform reduces to the
calculation of the dimension of the associated configuration space. Our methods
give improved upper bounds for computing the Fourier transform for the general
linear groups over finite fields, the classical Weyl groups, and homogeneous
spaces of finite groups, while also recovering the best known algorithms for
the symmetric group and compact Lie groups.Comment: 53 pages, 5 appendices, 34 figure
Why do the Rich Save More? A Theory and Australian Evidence
We provide a theory to explain the existence of inequality in an economy where agents have identical preferences and have access to the same production technology. Agents consume a "utility" good and a "health" good which determines their subjective discount factor. Depending on initial distribution of capital the economy gets separated into different permanent-income groups. This leads to a testable hypothesis: "The rich save a larger proportion of their permanent income". We test this implication for the savings behaviour in Australia. We show that even after controlling for life-cycle characteristics permanent income and savings are positively correlated. An improvement in the health leads to a positive effect on savings behaviour.Saving; Inter-temporal Choice; Health; Income Distribution
Exactly solvable su(N) mixed spin ladders
It is shown that solvable mixed spin ladder models can be constructed from
su(N) permutators. Heisenberg rung interactions appear as chemical potential
terms in the Bethe Ansatz solution. Explicit examples given are a mixed
spin-1/2 spin-1 ladder, a mixed spin-1/2 spin-3/2 ladder and a spin-1 ladder
with biquadratic interactions.Comment: 7 pages, Latex, Presented at the Baxter Revolution in Mathematical
Physics Conference, Feb 13-19, 200
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