1,524 research outputs found
Beyond the Property Tax: Local Government Revenue Diversification
Local governments in the U.S. rely less on the property tax than they have historically. This long-term trend has been accompanied by important shifts in the composition of local revenues. While the property tax still serves as one primary source of local government revenue, increasingly other sources are used to pay for local government. This paper first examines that trend, the forces behind it, and its regional impact. We then explore trends in three central states- Iowa, Nebraska, and Arkansas -- that have experienced substantial revenue shifts in recent years. A concluding section discusses the options for the future
Devolution, Fiscal Federalism, and Changing Patterns of Municipal Revenues: The Mismatch between Theory and Reality
Theories of fiscal federalism, such as those propounded by Musgrave, Tiebout, and Brennan and Buchanan, prescribe assignment of revenue sources among federal, state, and local governments. In this article, we demonstrate that the recent diversification of municipal revenue sources in response to devolutionary forces does not follow the expectations of the fiscal federalism theories. Our analysis suggests that the use of an institutional approach to the study of fiscal federalism would help to reduce the mismatch between theory and reality
Local Projections of Low-Momentum Potentials
Nuclear interactions evolved via renormalization group methods to lower
resolution become increasingly non-local (off-diagonal in coordinate space) as
they are softened. This inhibits both the development of intuition about the
interactions and their use with some methods for solving the quantum many-body
problem. By applying "local projections", a softened interaction can be reduced
to a local effective interaction plus a non-local residual interaction. At the
two-body level, a local projection after similarity renormalization group (SRG)
evolution manifests the elimination of short-range repulsive cores and the flow
toward universal low-momentum interactions. The SRG residual interaction is
found to be relatively weak at low energy, which motivates a perturbative
treatment
Propulsion and Space Vehicle Systems Analysis Program Tensor I, volume I Technical report no. 341
Computer program for space vehicle and propulsion systems analysi
A Research-Based Curriculum for Teaching the Photoelectric Effect
Physics faculty consider the photoelectric effect important, but many
erroneously believe it is easy for students to understand. We have developed
curriculum on this topic including an interactive computer simulation,
interactive lectures with peer instruction, and conceptual and mathematical
homework problems. Our curriculum addresses established student difficulties
and is designed to achieve two learning goals, for students to be able to (1)
correctly predict the results of photoelectric effect experiments, and (2)
describe how these results lead to the photon model of light. We designed two
exam questions to test these learning goals. Our instruction leads to better
student mastery of the first goal than either traditional instruction or
previous reformed instruction, with approximately 85% of students correctly
predicting the results of changes to the experimental conditions. On the
question designed to test the second goal, most students are able to correctly
state both the observations made in the photoelectric effect experiment and the
inferences that can be made from these observations, but are less successful in
drawing a clear logical connection between the observations and inferences.
This is likely a symptom of a more general lack of the reasoning skills to
logically draw inferences from observations.Comment: submitted to American Journal of Physic
Direct measurements of neutron capture on radioactive isotopes
We simulated the response of a 4p calorimetric g-detector array to decays of
radioactive isotopes on the s-process path. The GEANT 3.21 simulation package
was used. The main table contains estimates on the maximum sample size and
required neutron flux based on the latest available neutron capture cross
section at 30 keV. The results are intended to be used to estimate the
feasibility of neutron capture measurements with 4p arrays using the time of
flight technique
Superconducting and Normal State Properties of Neutron Irradiated MgB2
We have performed a systematic study of the evolution of the superconducting
and normal state properties of neutron irradiated MgB wire segments as a
function of fluence and post exposure annealing temperature and time. All
fluences used suppressed the transition temperature, Tc, below 5 K and expanded
the unit cell. For each annealing temperature Tc recovers with annealing time
and the upper critical field, Hc2(T=0), approximately scales with Tc. By
judicious choice of fluence, annealing temperature and time, the Tc of damaged
MgB2 can be tuned to virtually any value between 5 and 39 K. For higher
annealing temperatures and longer annealing times the recovery of Tc tends to
coincide with a decrease in the normal state resistivity and a systematic
recovery of the lattice parameters.Comment: Updated version, to appear in Phys. Rev.
EXPERIMENTAL TEST OF THE KUMAR--BARANGER PAIRING-PLUS-QUADRUPOLE FORCE MODEL IN THE A = 190 REGION THROUGH E2-M1 MIXING AMPLITUDES.
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