2,321 research outputs found
THE INFLUENCE OF WATER QUALITY ON THE HOUSING PRICE AROUND LAKE ERIE
The primary objective of this paper is to estimate the influence of Lake Erie water quality on the housing price by taking spatial effects into account. The robust LM tests for spatial autocorrelation suggested that spatial error model specification is more likely model in our study. Fecal coliform counts and Secchi depth disk reading are used as water quality measures. In order to overcome the spatio-temporal aspects of Secchi depth disk reading data, Kriging was used for spatial prediction. We found the significant influences of both water quality measures on housing values. Gradient effects considering the distance from a beach and water quality variables are also observed.Public Economics,
Axion-photon conversion caused by dielectric interfaces: quantum field calculation
Axion-photon conversion at dielectric interfaces, immersed in a
near-homogeneous magnetic field, is the basis for the dielectric haloscope
method to search for axion dark matter. In analogy to transition radiation,
this process is possible because the photon wave function is modified by the
dielectric layers ("Garibian wave function") and is no longer an eigenstate of
momentum. A conventional first-order perturbative calculation of the transition
probability between a quantized axion state and these distorted photon states
provides the microwave production rate. It agrees with previous results based
on solving the classical Maxwell equations for the combined system of axions
and electromagnetic fields. We argue that in general the average photon
production rate is given by our result, independently of the detailed quantum
state of the axion field. Moreover, our result provides a new perspective on
axion-photon conversion in dielectric haloscopes because the rate is based on
an overlap integral between unperturbed axion and photon wave functions, in
analogy to the usual treatment of microwave-cavity haloscopes.Comment: 15 pages, 2 figures; v2: minor changes to match published versio
Primely generated refinement monoids
We extend both Dobbertin's characterization of primely generated regular refinement monoids and Pierce's characterization of primitive monoids to general primely generated refinement monoids.The first-named author was partially supported by DGI MINECO
MTM2011-28992-C02-01, by FEDER UNAB10-4E-378 "Una manera de hacer Europa", and by the Comissionat per Universitats i Recerca de la Generalitat de Catalunya. The second-named author was partially supported by the DGI and European Regional Development Fund, jointly, through Project MTM2011-28992-C02-02, and by PAI III grants FQM-298 and P11-FQM-7156 of the Junta de AndalucĂa
Exchange Leavitt path algebras and stable rank
We characterize those Leavitt path algebras which are exchange rings in terms of intrinsic properties of the graph and show that the values of the stable rank for these algebras are 1, 2 or â. Concrete criteria in terms of properties of the underlying graph are given for each case
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