455 research outputs found
On A Parabolic Equation in MEMS with An External Pressure
The parabolic problem on a
bounded domain of with Dirichlet boundary condition models the
microelectromechanical systems(MEMS) device with an external pressure term. In
this paper, we classify the behavior of the solution to this equation. We first
show that under certain initial conditions, there exists critical constants
and such that when , , there exists a global solution, while for or , the solution quenches in finite time. The
estimate of voltage , quenching time and pressure term
are investigated. The quenching set is proved to be a compact subset
of with an additional condition, provided is a
convex bounded set. In particular, if is radially symmetric, then the
origin is the only quenching point. Furthermore, we not only derive the
two-side bound estimate for the quenching solution, but also study the
asymptotic behavior of the quenching solution in finite time.Comment: 35 pages, 1 figure. arXiv admin note: substantial text overlap with
arXiv:1402.0066 by other author
Analysis of at CEPC
The rare decays are sensitive to contributions of new
physics (NP) and helpful to resolve the puzzle of multiple flavor
anomalies. In this work, we propose to study the
transition at a future lepton collider operating at the pole through the
decay. Using the decay form factors
from lattice simulations, we first update the SM prediction of BR( and the
corresponding longitudinal polarization fraction
. Our analysis uses the full CEPC simulation
samples with a net statistic of decays. Precise
and reconstructions are used to suppress backgrounds. The results show
that BR( can be measured with a statistical
uncertainty of and an ratio of at the
CEPC. The quality measures for the event reconstruction are also derived. By
combining the measurement of BR( and , the
constraints on the effective theory couplings at low energy are given.Comment: 12 pages, 15 figures, 3 table
Integration of renewable energy sources: reliability-constrained power system planning and operations using computational intelligence
Renewable sources of energy such as wind turbine generators and solar panels
have attracted much attention because they are environmentally friendly, do not
consume fossil fuels, and can enhance a nation’s energy security. As a result, recently
more significant amounts of renewable energy are being integrated into conventional
power grids. The research reported in this dissertation primarily investigates the
reliability-constrained planning and operations of electric power systems including
renewable sources of energy by accounting for uncertainty. The major sources of
uncertainty in these systems include equipment failures and stochastic variations in
time-dependent power sources.
Different energy sources have different characteristics in terms of cost, power
dispatchability, and environmental impact. For instance, the intermittency of some
renewable energy sources may compromise the system reliability when they are integrated into the traditional power grids. Thus, multiple issues should be considered in
grid interconnection, including system cost, reliability, and pollutant emissions. Furthermore, due to the high complexity and high nonlinearity of such non-traditional
power systems with multiple energy sources, computational intelligence based optimization methods are used to resolve several important and challenging problems in
their operations and planning. Meanwhile, probabilistic methods are used for reliability evaluation in these reliability-constrained planning and design.
The major problems studied in the dissertation include reliability evaluation of
power systems with time-dependent energy sources, multi-objective design of hybrid
generation systems, risk and cost tradeoff in economic dispatch with wind power penetration, optimal placement of distributed generators and protective devices in power
distribution systems, and reliability-based estimation of wind power capacity credit.
These case studies have demonstrated the viability and effectiveness of computational
intelligence based methods in dealing with a set of important problems in this research
arena
Capital market reaction to corporate restructuring announcements : an empirical test in the Shanghai Stock Exchange (SSE)
1 online resource (iii, 28 p.) : col. ill.Includes abstract and appendix.Includes bibliographical references (p. 25-26).The paper utilizes an event study to test whether there is an abnormal return from corporate restructuring announcements in the Shanghai Stock Exchange. We obtain data of abnormal returns and cumulative abnormal return using the Market Model. In the study two term event windows are applied, and after the t-test and bootstrap test, the relationship between the abnormal return and corporate restructuring announcements is confirmed
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