59,384 research outputs found
Economic Fluctuations and Stabilizing Policies
The paper discusses the extent and spread of economic fluctuations across selected countries during the Great Depression and the last over 40 years. Also, it analyses the possible causes of each major business cycle, the roles that the fiscal and monetary policies have played to counter them, and the inherent limitations of these policies in getting a total rid of all such fluctuations.
Recent Developments inMacroeconomics
The paper presents the subject matter of macroeconomics and the developments that have taken place in macroeconomic theory and policy since the Keynesian theory of 1936. In particular, it highlights the problems in data measurement, describes the business cycles and the roles of stabilisation policies in countering them, and delineates the factors determining economic growth.
Two photon quantum interference in plasmonics - Theory and Applications
We report perfect two photon quantum interference with near-unity visibility
in a resonant tunneling plasmonic structure in folded Kretschmann geometry.
This is despite absorption-induced loss of unitarity in plasmonic systems. The
effect is traced to perfect destructive interference between the squares of
amplitude reflection and transmission coefficients. We further highlight yet
another remarkable potential of coincidence measurements as a probe with better
resolution as compared to standard spectroscopic techniques. The finer features
show up in both angle resolved and frequency resolved studies.Comment: 5 pages, 6 figure
Giant Radiative Interactions Among Distant Atoms
We examine the feasibility of enhancing the fundamental radiative
interactions between distant atoms. We present general arguments for producing
enhancement. In particular, we show how giant dipole-dipole interaction can be
produced by considering dipoles placed close to micron sized silica spheres.
The giant interaction arises as the whispering gallery modes can resonantly
couple the dipoles.Comment: 4 figures included in the postscript file, to appear in "Current
trens in Atomic and Molecular Physics", edited by R. Srivastava (Phoenix
publishing House, New Delhi, India, 2001
Staggered fermion matrix elements using smeared operators
We investigate the use of two kinds of staggered fermion operators, smeared
and unsmeared. The smeared operators extend over a hypercube, and tend to
have smaller perturbative corrections than the corresponding unsmeared
operators. We use these operators to calculate kaon weak matrix elements on
quenched ensembles at , 6.2 and 6.4. Extrapolating to the continuum
limit, we find . The
systematic error is dominated by the uncertainty in the matching between
lattice and continuum operators due to the truncation of perturbation theory at
one-loop. We do not include any estimate of the errors due to quenching or to
the use of degenerate and quarks. For the
electromagnetic penguin operators we find
and . We also use the ratio of unsmeared to
smeared operators to make a partially non-perturbative estimate of the
renormalization of the quark mass for staggered fermions. We find that tadpole
improved perturbation theory works well if the coupling is chosen to be
\alpha_\MSbar(q^*=1/a).Comment: 22 pages, 1 figure, uses eps
Symmetry energy from fragment observables in the canonical thermodynamic model
Different formulas relying measurable fragment isotopic observables to the
symmetry energy of excited nuclei have been proposed and applied to the
analysis of heavy ion collision data in the recent literature. In this paper we
examine the quality of the different expressions in the framework of the McGill
Canonical Thermodynamic Model. We show that even in the idealized situation of
canonical equilibrium and in the absence of secondary decay, these formulas do
not give a precise reconstruction of the symmetry energy of the fragmenting
source. However, both isotopic widths and isoscaling appear very well
correlated to the physical symmetry energy.Comment: Submitted to Physical Review
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