8,573 research outputs found
Terms of Trade Shocks and Endogenous Search Unemployment: A Two-sector Model with Non-Traded goods
We develop a simple and tractable two-sector search model featuring a non-traded sector and endogenous search unemployment to examine the impact of terms of trade shocks on unemployment. We show that changes in terms of trade will not only lead to employment reallocation across sectors, as in the traditional trade models, but more importantly, impact upon search unemployment within each sector. Specifically, we show that an improvement (deterioration) of terms of trade reduces (increases) unemployment rates in both traded and non-traded sectors.two-sector search model, trade and unemployment, non-traded good
Singularity problem in f(R) model with non-minimal coupling
We consider the non-minimal coupling between matter and the geometry in the
f(R) theory. In the new theory which we established, a new scalar has
been defined and we give it a certain stability condition. We intend to take a
closer look at the dark energy oscillating behavior in the de-Sitter universe
and the matter era, from which we derive the oscillating frequency, and the
oscillating condition. More importantly, we present the condition of coupling
form that the singularity can be solved. We discuss several specific coupling
forms, and find logarithmic coupling with an oscillating period in the matter era , can improve singularity in the early
universe. The result of numerical calculation verifies our theoretic
calculation about the oscillating frequency. Considering two toy models, we
find the cosmic evolution in the coupling model is nearly the same as that in
the normal f(R) theory when . We also discuss the local tests of the
non-minimal coupling f(R) model, and show the constraint on the coupling form.Comment: 13 pages, 4 figure
Angular Reconstruction of a Lead Scintillating-Fiber Sandwiched Electromagnetic Calorimeter
A new method called Neighbor Cell Deposited Energy Ratio (NCDER) is proposed
to reconstruct incidence position in a single layer for a 3-dimensional imaging
electromagnetic calorimeter (ECAL).This method was applied to reconstruct the
ECAL test beam data for the Alpha Magnetic Spectrometer-02 (AMS-02). The
results show that this method can achieve an angular resolution of 7.36\pm 0.08
/ \sqrt(E) \oplus 0.28 \pm 0.02 degree in the determination of the photons
direction, which is much more precise than that obtained with the
commonly-adopted Center of Gravity(COG) method (8.4 \pm 0.1 /sqrt(E) \oplus
0.8\pm0.3 degree). Furthermore, since it uses only the properties of
electromagnetic showers, this new method could also be used for other type of
fine grain sampling calorimeters.Comment: 6 pages, 8 figure
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