3,974 research outputs found
Signal Amplification Assisted by Multiple Sideband Interference in 1D Waveguide QED Systems
This study theoretically investigates signal amplification resulting from
multiple Rabi sideband coherence in a one-dimensional waveguide quantum
electrodynamical system. Specifically, we explore the behavior of a transmon
while strongly driven by a coherent microwave field through a semi-infinite
waveguide. To understand the underlying mechanisms of amplification, we develop
a theory that explicitly takes into account multiple dressed sidebands under a
strong driving field, and analyze the reflection amplitude of the probe signal.
Our findings show that amplification can be related to either population
inversion or multiple sideband constructive interference in some cases without
population inversion. We further examine the effect of qubit dephasing during
the amplification process
Effects of System Characteristics on Adopting Web-Based Advanced Traveller Information System: Evidence from Taiwan
This study proposes a behavioural intention model that integrates information quality, response time, and system accessibility into the original technology acceptance model (TAM) to investigate whether system characteristics affect the adoption of Web-based advanced traveller information systems (ATIS). This study empirically tests the proposed model using data collected from an online survey of Web-based advanced traveller information system users. Confirmatory factor analysis (CFA) was performed to examine the reliability and validity of the measurement model, and structural equation modelling (SEM) was used to evaluate the structural model. The results indicate that three system characteristics had indirect effects on the intention to use through perceived usefulness, perceived ease of use, and attitude toward using. Information quality was the most important system characteristic factor, followed by response time and system accessibility. This study presents implications for practitioners and researchers, and suggests directions for future research.</p
Design of Direct and Indirect Wind Energy Harvest Systems
-Developing wind energy by using wind collector and
electroactive materials are proposed and investigated in this
article. Two systems will be considered to harvest energy:
direct and indirect system. In direct system, wind induced
drag force directly blow and vibrate the electroactive
materials in the duct for generating electricity. Wind flowguided
mechanism is designed to collect arbitrarily blowing
wind in environment and guide the flow direction
perpendicular to the cross section of the nozzle as much as
possible so that more uniform velocity distribution profile is
achieved. Nozzle accelerator is designed for the purpose of
increasing wind velocity. Indirect system uses gear as
additional mechanism to impact and vibrate the electroactive
materials. Two types of indirect system integrating the wind
collector with fan and roof turbine ventilator to impact and
vibrate electroactive materials are proposed
Population Growth and Competition Models with Decay and Competition Consistent Delay
We derive an alternative expression for a delayed logistic equation in which
the rate of change in the population involves a growth rate that depends on the
population density during an earlier time period. In our formulation, the delay
in the growth term is consistent with the rate of instantaneous decline in the
population given by the model. Our formulation is a modification of [Arino et
al., J.~Theoret.~Biol.~241(1):109--119, 2006] by taking the intraspecific
competition between the adults and juveniles into account. We provide a
complete global analysis showing that no sustained oscillations are possible. A
threshold giving the interface between extinction and survival is determined in
terms of the parameters in the model. The theory of chain transitive sets and
the comparison theorem for cooperative delay differential equations are used to
determine the global dynamics of the model.
We extend our delayed logistic equation to a system modeling the competition
of two species. For the competition model, we provide results on local
stability, bifurcation diagrams, and adaptive dynamics. Assuming that the
species with shorter delay produces fewer offspring at a time than the species
with longer delay, we show that there is a critical value, , such that
the evolutionary trend is for the delay to approach .Comment: 22 pages, 6 figures, 1 tabl
Travelling wave solutions for Kolmogorov-type delayed lattice reaction–diffusion systems
[[abstract]]This work investigates the existence and non-existence of travelling wave solutions for Kolmogorov-type delayed lattice reaction–diffusion systems. Employing the cross iterative technique coupled with the explicit construction of upper and lower solutions in the theory of quasimonotone dynamical systems, we can find two threshold speeds c∗ and c∗ with c∗≥c∗>0. If the wave speed is greater than c∗, then we establish the existence of travelling wave solutions connecting two different equilibria. On the other hand, if the wave speed is smaller than c∗, we further prove the non-existence result of travelling wave solutions. Finally, several ecological examples including one-species, two-species and three-species models with various functional responses and time delays are presented to illustrate the analytical results.[[notice]]補正完畢[[journaltype]]國外[[incitationindex]]SCI[[ispeerreviewed]]Y[[booktype]]紙本[[countrycodes]]GB
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