298 research outputs found
Asymptotic Stability and Exponential Stability of Impulsive Delayed Hopfield Neural Networks
A criterion for the uniform asymptotic stability of the equilibrium point of impulsive delayed Hopfield
neural networks is presented by using Lyapunov functions and linear matrix inequality approach. The
criterion is a less restrictive version of a recent result. By means of constructing the extended impulsive Halanay
inequality, we also analyze the exponential stability of impulsive delayed Hopfield neural networks. Some new
sufficient conditions ensuring exponential stability of the equilibrium point of impulsive delayed Hopfield neural
networks are obtained. An example showing the effectiveness of the present criterion is given
Theoretical and Experimental Adsorption Studies of Polyelectrolytes on an Oppositely Charged Surface
Using self-assembly techniques, x-ray reflectivity measurements, and computer
simulations, we study the effective interaction between charged polymer rods
and surfaces. Long-time Brownian dynamics simulations are used to measure the
effective adhesion force acting on the rods in a model consisting of a planar
array of uniformly positively charged, stiff rods and a negatively charged
planar substrate in the presence of explicit monovalent counterions and added
monovalent salt ions in a continuous, isotropic dielectric medium. This
electrostatic model predicts an attractive polymer-surface adhesion force that
is weakly dependent on the bulk salt concentration and that shows fair
agreement with a Debye-Huckel approximation for the macroion interaction at
salt concentrations near 0.1 M. Complementary x-ray reflectivity experiments on
poly(diallyldimethyl ammonium) chloride (PDDA) monolayer films on the native
oxide of silicon show that monolayer structure, electron density, and surface
roughness are likewise independent of the bulk ionic strength of the solution.Comment: Revtex, prb format; uses amssym
Nonlinear vibration of hypoid gear with backlash
Due to the machining errors, alignment error, wear, tear and time varying stiffness of hypoid teeth, the vibration of hypoid gears is inevitably produced in the course of working, and its vibration and noise is the main sources of vibration and noise in the automobile transmission. Study on nonlinear vibration and noise of the hypoid gear pair, and investigating on reducing its vibration and noise are of great significance. Firstly, a simplified nonlinear vibration model of the hypoid gears of main reducer, with considering the time-varying teeth stiffness and teeth surface friction damping, was established. Then, a numerical simulation method was employed to simulate different gear backlash effects on the hypoid gear vibration behaviors caused by the gear worn, and effects on the gear non-linear vibration from different work speeds of gear and different loading torques were investigated. In order to help to explain the non-linear vibration phenomenon of the hypoid gears, the 2-D phase plane diagram and the 3-D trajectory were employed. Lastly, the bench test was carried out to verify the simulation results on vibration of hypoid gears with backlash
Combining Social Cognitive Theories with Linguistic Features for Multi-genre Sentiment Analysis
Thermomechanical fatigue life prediction for a marine diesel engine piston considering ring dynamics
A newly designed marine diesel engine piston was modeled using a precise finite element analysis (FEA). The high cycle fatigue (HCF) safety factor prediction procedure designed in this study incorporated lubrication, thermal, and structure analysis. The piston ring dynamics calculation determined the predicted thickness of lubrication oil film. The film thickness influenced the calculated magnitude of the heat transfer coefficient (HTC) used in the thermal loads analysis. Moreover, the gas pressure of ring lands and ring grooves used in mechanical analysis is predicted based on the piston ring dynamics model
Janus Monolayer Transition Metal Dichalcogenides
A novel crystal configuration of sandwiched S-Mo-Se structure (Janus SMoSe)
at the monolayer limit has been synthesized and carefully characterized in this
work. By controlled sulfurization of monolayer MoSe2 the top layer of selenium
atoms are substituted by sulfur atoms while the bottom selenium layer remains
intact. The peculiar structure of this new material is systematically
investigated by Raman, photoluminescence and X-ray photoelectron spectroscopy
and confirmed by transmission-electron microscopy and time-of-flight secondary
ion mass spectrometry. Density-functional theory calculations are performed to
better understand the Raman vibration modes and electronic structures of the
Janus SMoSe monolayer, which are found to correlate well with corresponding
experimental results. Finally, high basal plane hydrogen evolution reaction
(HER) activity is discovered for the Janus monolayer and DFT calculation
implies that the activity originates from the synergistic effect of the
intrinsic defects and structural strain inherent in the Janus structure.Comment: 22 pages, 12 figure
Experimental investigation of the flame retardant and form-stable composite phase change materials for a power battery thermal management system
© 2020 Elsevier Ltd. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence http://creativecommons.org/licenses/by-nc-nd/4.0/.An efficient battery thermal management system (BTMS) will undoubtedlypromote the performance and lifespan of battery packs. In this study, a novelflame-retarded composite PCMs composed by paraffin (PA), expanded graphite (EG), ammonium polyphosphate (APP), red phosphorus (RP) and epoxy resin (ER) has been proposed for battery module. The thermophysical and flame retardant properties are investigated at both macro and micro levels. The results show that the proposed composite PCMs with an APP/RP ratio of 23/10 exhibit the optimum flame retardant performance. Besides, the APP/RP-based composite PCMs for 18650 ternary battery module has also been researched comparing with air cooled and PCM with pure PA modes. The experimental results indicated that the fire retardant PCMs shown significant cooling and temperature balancing advantages for battery module, leading to a 44.7% and 30.1% reduction rate of the peak temperature and the maintenance of the maximum temperature difference within 1.36°C at a 3 C discharge rate for 25°C. Even at 45°C, the temperature uniformity can still be controlled within 5°C. Thus, this research indicates the composite PCM had good flame retardant and form stable properties, it would be utilized in BTMS, energy storage and other fields.Peer reviewe
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