3,349 research outputs found
Is there a link between unemployment and criminality in the us economy? Further evidence
Using Markov-Switching models, this paper studies the existence of a relationship between the unemployment rate and four different types of crimes in the U.S. economy. After it, using the non-parametric Concordance Index of Harding and Pagan (2002, 2006), the correlation between the cycles of unemployment rate and crime variables is determined. Results confirm that there is no significant relationship between the unemployment rate, burglary and motor-vehicle theft. However, the unemployment rate has a significant relationship with robbery and larceny. The contemporaneous relationship is positive for robbery and negative for larceny. However, it turns to be positive between the lagged values of the unemployment rate and larceny.Markov-Switching Models, Cycles, Unemployment, Crime.
An Entourage Approach to the Contraction Principle in Uniform Spaces Endowed with a Graph
In this paper, we study Banach contractions in uniform spaces endowed with a
graph and give some sufficient conditions for a mapping to be a Picard
operator. Our main results generalize some results of [J. Jachymski, "The
contraction principle for mappings on a metric space with a graph", Proc. Amer.
Math. Soc. 136 (2008) 1359-1373] employing the basic entourages of the uniform
space.Comment: 20 page
Manipulation of Giant Faraday Rotation in Graphene Metasurfaces
Faraday rotation is a fundamental magneto-optical phenomenon used in various
optical control and magnetic field sensing techniques. Recently, it was shown
that a giant Faraday rotation can be achieved in the low-THz regime by a single
monoatomic graphene layer. Here, we demonstrate that this exceptional property
can be manipulated through adequate nano-patterning, notably achieving giant
rotation up to 6THz with features no smaller than 100nm. The effect of the
periodic patterning on the Faraday rotation is predicted by a simple physical
model, which is then verified and refined through accurate full-wave
simulations.Comment: 4 pages, 5 figures, submitted to Applied Physics Letter
Fixed Points for Ciric-G-Contractions in Uniform Spaces Endowed with a Graph
In this paper, we generalize the notion of -generalized contractions
introduced by \'Ciri\'c from metric to uniform spaces endowed with a graph and
discuss on the existence and uniqueness of fixed points for this type of
contractions using the basic entourages.Comment: 12 page
Tunable plasmon-enhanced birefringence in ribbon array of anisotropic 2D materials
We explore the far-field scattering properties of anisotropic 2D materials in
ribbon array configuration. Our study reveals the plasmon-enhanced linear
birefringence in these ultrathin metasurfaces, where linearly polarized
incident light can be scattered into its orthogonal polarization or be
converted into circular polarized light. We found wide modulation in both
amplitude and phase of the scattered light via tuning the operating frequency
or material's anisotropy and develop models to explain the observed scattering
behavior
Dynamic modelling of biochemical reaction networks and sampling methods for constraint-based models
This dissertation is a partial fulfillment of the requirements for the degree of Doctor of Philosophy (PhD). This study is carried out at the Department of Mathematics, University of Bergen. The subject of the thesis is dynamic Modelling of biochemical reaction networks and sampling methods for constraint-based models.Doktorgradsavhandlin
- …