36,415 research outputs found
EVALUATING THE IMPACTS OF AGRICULTURAL EXPORTS ON A REGIONAL ECONOMY
Agricultural exports are important to many regional economies, as is the case for agricultural exports wither produced in or shipped through Louisiana. A hybrid (revised and verified) IMPLAN model of the Louisiana economy is used to estimate the direct and indirect impact of agricultural exports. Original model estimates of foreign exports lacked holistic (overall) accuracy. However, other, more general uses of the model were unaffected by this lack of accuracy. While the contributions of agricultural exports to the state economy were substantial, impacts were concentrated in unprocessed products. Increasing the export of processed agricultural products should enhance economic activity.Agricultural exports, Holistic accuracy, IMPLAN, Input-output models, Processed exports, Community/Rural/Urban Development, International Relations/Trade,
Universal Markovian reduction of Brownian particle dynamics
Non-Markovian processes can often be turned Markovian by enlarging the set of
variables. Here we show, by an explicit construction, how this can be done for
the dynamics of a Brownian particle obeying the generalized Langevin equation.
Given an arbitrary bath spectral density , we introduce an orthogonal
transformation of the bath variables into effective modes, leading stepwise to
a semi-infinite chain with nearest-neighbor interactions. The transformation is
uniquely determined by and defines a sequence
of residual spectral densities describing the
interaction of the terminal chain mode, at each step, with the remaining bath.
We derive a simple, one-term recurrence relation for this sequence, and show
that its limit is the quasi-Ohmic expression provided by the Rubin model of
dissipation. Numerical calculations show that, irrespective of the details of
, convergence is fast enough to be useful in practice for an effective
Markovian reduction of quantum dissipative dynamics
Double-impulse magnetic focusing of launched cold atoms.
We have theoretically investigated three-dimensional focusing of a launched cloud of cold atoms using a pair of magnetic lens pulses (the alternate-gradient method). Individual lenses focus radially and defocus axially or vice versa. The performance of the two possible pulse sequences are compared and found to be ideal for loading both 'pancake' and 'sausage' shaped magnetic/optical microtraps. It is shown that focusing aberrations are considerably smaller for double-impulse magnetic lenses compared to single-impulse magnetic lenses. An analysis of clouds focused by the double-impulse technique is presented
Whats new in CAH?
This presentation explored the pathophysiology of congenital adrenal hyperplasia (CAH), discussed the medical and surgical management, and then key roles of the specialist paediatric endocrine nurs
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