10,125 research outputs found
Optimal dynamic electricity consumption function estimation: an institutional experimental evidence from Guangzhou, China (1949-2016)
This research demonstrates from a dynamic optimal perspective
that electricity consumption for a metropolitan area is a function
of economic output, electricity consumption habits, and electricity
demand management reform. The empirical results include: (1) an
unidirectional Granger causality exists linking economic output to
electricity consumption; (2) given electricity consumption habits
under the context of the electricity demand management reform,
an economic output increase of 1% results in the increase of electricity consumption by 0.22%, and (3), after demand management
has been implemented, economic output continues to increase
electricity consumption, but at a lower rate than prior to reform.
These empirical results imply that the ‘conservation hypothesis’ is
upheld over the long-run at the regional level in Guangzhou from
1949 to 2016
production off the proton in a Regge-plus-chiral quark approach
A chiral constituent quark model approach, embodying s- and u-channel
exchanges,complemented with a Reggeized treatment for t-channel is presented. A
model is obtained allowing data for and to be describe satisfactorily. For the latter reaction, recently released
data by CLAS and CBELSA/TAPS Collaborations in the system total energy range
GeV are well reproduced due to the inclusion of
Reggeized trajectories instead of simple and poles.
Contribution from "missing" resonances is found to be negligible in the
considered processes.Comment: 23 pages.4 figures,4 tables, to appear in Phys.Rev.
Modeling the tensile behavior of fiber bundles with irregular constituent fibers
In this paper, the effect of fiber dimensional irregularities on the tensile behavior of fiber bundles is modeled, using the finite element method (FEM). Fiber dimensional irregularities are simulated with sine waves of different magnitude. The specific stress-strain curves of fiber bundles and the constituent single fibers are obtained and compared. The results indicate that fiber diameter irregularity along fiber length has a significant effect on the tensile behavior of the fiber bundle. For a bundle of uniform fibers of different diameters, all constituent fibers will break simultaneously regardless of the fiber diameter. Similarly, if fibers within a bundle have the same pattern and level of diameter irregularity along fiber length, the fibers will break at the same time also regardless of the difference in average diameter of each fiber. In these cases, the specific stress and strain curve for the bundle overlaps with that of the constituent fibers. When the fiber bundle consists of single fibers with different levels of diameter irregularity, the specific stress-strain and load-elongation curves of the fiber bundle exhibit a stepped or “ladder” shape. The fiber with the highest irregularity breaks first, even when the thinnest section of the fiber is still coarser than the diameter of a very thin but uniform fiber in the bundle. This study suggests that fiber diameter irregularity along fiber length is a more important factor than the fiber diameter itself in determining the tensile behavior of a fiber bundle consisting of irregular fibers.<br /
An improved study of the kappa resonance and the non-exotic wave scatterings up to GeV of LASS data
We point out that the dispersion relation for the left hand cut integral
presented in one of our previous paper (Nucl. Phys. {\bf A}733(2004)235) is
actually free of subtraction constant, even for unequal mass elastic
scatterings. A new fit to the LASS data~\cite{Aston} is performed and firm
evidence for the existence of pole is found. The correct use of
analyticity also put strong constraints on threshold parameters -- which are
found to be in good agreement with those obtained from chiral theories. We also
determined the pole parameters of on the second sheet, and
reconfirm the existence of on the third sheet. We stress that the
LASS data do not require them to have the twin pole structure of a typical
Breit--Wigner resonance.Comment: 14 pages + 4 postscript figures; discussions largely expanded;
references added; version to appear in NPA; title changed in the journa
Effect of low-Raman window position on correlated photon-pair generation in a chalcogenide Ge11.5As24Se64.5 nanowire
We investigated correlated photon-pair generation via spontaneous four-wave mixing in an integrated chalcogenideGe11.5As24Se64.5photonicnanowire. The coincidence to accidental ratio, a key measurement for the quality of correlated photon-pair sources, was measured to be only 0.4 when the photon pairs were generated at 1.9 THz detuning from the pump frequency due to high spontaneous Raman noise in this regime. However, the existence of a characteristic low-Raman window at around 5.1 THz in this material's Raman spectrum and dispersion engineering of the nanowire allowed us to generate photon pairs with a coincidence to accidental ratio of 4.5, more than 10 times higher than the 1.9 THz case. Through comparing the results with those achieved in chalcogenide As2S3waveguides which also exhibit a low Raman-window but at a larger detuning of 7.4 THz, we find that the position of the characteristic low-Raman window plays an important role on reducing spontaneous Raman noise because the phonon population is higher at smaller detuning. Therefore the ultimate solution for Raman noise reduction in Ge11.5As24Se64.5 is to generate photon pairs outside the Raman gain band at more than 10 THz detuning
Carpet cloaking on a dielectric half-space
Carpet cloaking is proposed to hide an object on a dielectric half-space from
electromagnetic (EM) detection. A two-dimensional conformal transformation
specified by an analytic function is utilized for the design. Only one
nonsingular material parameter distribution suffices for the characterization.
The cloaking cover situates on the dielectric half-space, and consists of a
lossless upper part for EM wave redirection and an absorbing bottom layer for
inducing correct reflection coefficient and absorbing transmission. Numerical
simulations with Gaussian beam incidence are performed for verification.Comment: 6 pages, 3 figure
Dissociation of H2 molecule on the {\beta}-Ga2O3 (100)B surface: The critical role of oxygen vacancy
We systematically study the dissociation of H2 molecules on the {\beta}-Ga2O3
(100)B surface, with the influences of surface oxygen vacancy being considered.
After introducing the surface oxygen vacancy, the nearest topmost O(I) atom
becomes very active, and hydrogen molecules become much easier to dissociate.Comment: 6 pages, 5 figure
New Topflavor Models with Seesaw Mechanism
New class of models are constructed in which the third family quarks, but not
leptons, experience a new SU(2) or U(1) gauge force. Anomaly cancellation
enforces the introduction of spectator quarks so that the top and bottom masses
are naturally generated via a seesaw mechanism. We find the new contributions
to the (S,T,U) parameters and Zbb vertex to be generically small. We further
analyze how the reasonable flavor mixing pattern can be generated to ensure the
top-seesaw mechanism and sufficiently suppress the flavor-changing effects for
light quarks. Collider signatures for the light Higgs boson and top quark are
also discussed.Comment: To match the version in Rapid Communication of PRD, RevTex 5p
QCD Corrections to Scalar Production via Heavy Quark Fusion at Hadron Colliders
We recently proposed that, due to the top-quark-mass enhanced Yukawa
coupling, the s-channel production of a charged scalar or pseudo-scalar from
heavy quark fusion can be an important new mechanism for discovering
non-standard spin-0 particles. In this work, we present the complete O(alpha_s)
QCD corrections to this s-channel production process at hadron colliders,
including the results of QCD resummation over multiple soft-gluon emission. The
systematic QCD-improved production and decay rates at the FermiLab Tevatron and
the CERN LHC are given for the charged top-pions in the topcolor models and for
the charged Higgs bosons in the generic two Higgs doublet model. The direct
extension to the production of the neutral (pseudo-)scalars via bb\bar fusion
is studied in the minimal supersymmetric standard model (MSSM) with large
tan(beta), and in the topcolor model with large bottom Yukawa coupling.Comment: Version to be published in Phys.Rev.D. Discussion on Rb added plus
minor improvements. Conclusions not changed. Latex2e, 40 pages, 16 figure
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