19,104 research outputs found
LM-Type tests for a Unit Root Allowing for a Break in Trend
We consider LM-type tests for a unit root allowing for a break in trend at an unknown date. In addition to the minimum LM test statistic, we propose new LM-type tests based on the least squares estimator of the break date under the null. We examine asymptotic behavior under the null hypothesis with and without a break. For all the endogenous break tests considered, the limiting distribution when there is a break in slope is not the same as when there is no break. Other authors have obtained similar results in the context of DF-type tests. Since this discrepancy is smaller for the LM-type based on the least squares estimator, smaller size distortions are to be expected when using this test statistic. Simulation experiments confirm the superiority in terms of size, power and break date estimation of the proposed methodUnit Root, Structural Change, Lagrange Multiplier Test, Breaking Trend
Observational constraints on dark matter-dark energy scattering cross section
In this letter, we report precise and robust observational constraints on
dark matter-dark energy scattering cross section, using the latest data from
cosmic microwave background (CMB) Planck temperature and polarization, baryon
acoustic oscillations (BAO) measurements and weak gravitational lensing data
from Canada-France-Hawaii Telescope Lensing Survey (CFHTLenS). The scattering
scenario consists of a pure momentum exchange between the dark components, and
we find at 95\% CL from the joint analysis
(CMB + BAO + CFHTLenS), for typical dark matter particle mass of the order 1-10
. We notice that the scattering among the dark components may
influence the growth of large scale structure in the Universe, leaving the
background cosmology unaltered.Comment: 6 pages, 4 figures, 1 table, Minor changes/additions, Matches the
version published in EPJ
Sensitivity of 8B breakup cross section to projectile structure in CDCC calculations
Given the Astrophysical interest of BeB, there have been
several experiments applying the Coulomb dissociation method for extracting the
capture rate. Measurements at Michigan State are dominated by
contributions but have a small component. On the other hand, a lower
energy measurement at Notre Dame has a much stronger contribution. The
expectation was that the two measurements would tie down the and thus
allow for an accurate extraction of the relevant for the capture process.
The aim of this brief report is to show that the factor in breakup
reactions does not translate into a scaling of the contribution in the
corresponding capture reaction. We show that changes to the B single
particle parameters, which are directly related to the component in the
capture reaction, do not effect the corresponding breakup reactions, using the
present reaction theory.Comment: 4 pages, 6 figures, revtex
Microfissuring of Inconel 718
A tentative mathematical computer model of the microfissuring process during electron beam welding of Inconel 718 has been constructed. Predictions of the model are compatible with microfissuring tests on eight 0.25-in. thick test plates. The model takes into account weld power and speed, weld loss (efficiency), parameters and material characteristics. Besides the usual material characteristics (thermal and strength properties), a temperature and grain size dependent critical fracture strain is required by the model. The model is based upon fundamental physical theory (i.e., it is not a mere data interpolation system), and can be extended to other metals by suitable parameter changes
A comparison of the physics of Gas Tungsten Arc Welding (GTAW), Electron Beam Welding (EBW), and Laser Beam Welding (LBW)
The physics governing the applicability and limitations of gas tungsten arc (GTA), electron beam (EB), and laser beam (LB) welding are compared. An appendix on the selection of laser welding systems is included
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