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Artificial synaptic behavior of the SBT-memristor

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Chinese Physics B 2021年第7期30卷 600-604页

作者： Gang dou ming-long dou Ren-Yuan Liu Mei Guo College of Electrical Engineering and Automation Shandong University of Science and TechnologyQingdao 266590China

The synapse of human brain neurons is not only the transmission channel of information,but also the basic unit of human brain learning and information *** artificial synapse is constructed based on the Sr_(0.97)Ba_(0.03)TiO_(3-x)(SBT)memristor,which realizes the short-term and long-term plasticity of the *** experiential learning and non-associative learning behavior in accordance with human cognitive rules are realized by using the SBT-memristor-based *** process of synaptic habituation and sensitization is *** study provides insightful guidance for realization of artificial synapse and the development of artificial neural network.

关键词： memristor artificial synapse synaptic plasticity experiential learning non-associative learning

Dynamics of the two-SBT-memristor-based chaotic circuit

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Chinese Physics B 2020年第11期29卷 271-282页

作者： Mei Guo Meng Zhang ming-long dou Gang dou Yu-Xia Li College of Electrical Engineering and Automation Shandong University of Science and TechnologyQingdao 266590China

A two-SBT-memristor-based chaotic circuit was proposed. The stability of the equilibrium point was studied by theoretical analysis. The close dependence of the circuit dynamic characteristics on its initial conditions and circuit parameters was investigated by utilizing Lyapunov exponents spectra, bifurcation diagrams, phase diagrams, and Poincaré maps. The analysis showed that the circuit system had complex dynamic behaviors, such as stable points, period, chaos, limit cycles,and so on. In particular, the chaotic circuit produced the multistability phenomenon, such as coexisting attractors and coexisting periods.

关键词： memristor chaotic circuit multistability coexisting attractors

Deciphering the role of ultra-low-loaded rhodium in NiFe-MIL-53 for superior oxygen evolution reaction

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Journal of Energy Chemistry 2025年第1期100卷 77-86页

作者： Jinzhi Jia Jinhua Zhang Kailu Guo Lanyue Zhang Gening Du Hao You Junfeng Huang Mudong Tu Hua Li Yong Peng Wei dou Cailing Xu State Key Laboratory of Applied Organic Chemistry College of Chemistry and Chemical Engineering School of Materials and Energy Lanzhou University College of Chemistry and Chemical Engineering Luoyang Normal University

Designing highly active and stable electrocatalysts of oxygen evolution reaction （OER） is one of the crucial *** this study,a novel OER electrocatalyst,NiFe-MIL-53 modified with ultra-low rhodium（Rh@NiFe-MIL-53）,is successfully prepared via the hydrothermal ***-situ Raman spectroscopy and electrochemical impedance spectroscopy reveal that the doped Rh accelerates the phase transformation of NiFe-MIL-53 and the in-situ formed Rh@NiFeOOH is the actual active *** importantly,the enhanced reversibility of electrochemical reconstruction between NiFeOOH and NiFe（OH）2after doping Rh is beneficial for improving the electrochemical stability of the catalyst.X-ray photoelectron spectroscopy spectra show the strong electronic interaction between single-atom Rh and Ni/Fe in Rh@***,theoretical calculations confirm that the integration of single-atom Rh into the NiFeOOH successfully reduces the band gap,regulates the d-band center （εd）,accelerates the charge transfer,and optimizes the adsorption behavior of oxygen-containing intermediates,thereby lowering the energy barrier of rate-determining ***,the optimized Rh@NiFe-MIL-53 exhibits excellent OER activity （240 mV） with a small Tafel slope of 48.2 mV dec-1and long-term durability (over1270 h at 10 m A cm-2and 110 h at 200 mA cm-2).This work presents a new perspective on designing highly efficient OER electrocatalysts.

关键词： NiFe-MIL-53 Rh Electrochemical reconstruction Catalytic mechanism Oxygen evolution reaction

An Integrated Hydrodynamics and Control Model of A Tethered Underwater Robot

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China Ocean Engineering 2018年第5期32卷 557-569页

作者： WU Jia-ming XU Ying TAO long-bin YU Miao dou Yi-zhe Department of Naval Architecture and Ocean Engineering School of Civil Engineering and TransportationSouth China University of Technology Department of Naval Architecture Ocean & Marine EngineeringUniversity of Strathclyde

An integrated hydrodynamics and control model to simulate tethered underwater robot system is proposed. The governing equation of the umbilical cable is based on a finite difference method, the hydrodynamic behaviors of the underwater robot are described by the six-degrees-of-freedom equations of motion for submarine simulations, and a controller based on the fuzzy sliding mode control(FSMC) algorithm is also incorporated. Fluid motion around the main body of moving robot with running control ducted propellers is governed by the Navier–Stokes equations and these nonlinear differential equations are solved numerically via computational fluid dynamics(CFD) technique. The hydrodynamics and control behaviors of the tethered underwater robot under certain designated trajectory and attitude control manipulation are then investigated based on the established hydrodynamics and control model. The results indicate that satisfactory control effect can be achieved and hydrodynamic behavior under the control operation can be observed with the model; much kinematic and dynamic information about tethered underwater robot system can be forecasted, including translational and angular motions of the robot, hydrodynamic loading on the robot, manipulation actions produced by the control propellers, the kinematic and dynamic behaviors of the umbilical cable. Since these hydrodynamic effects are fed into the proposed coupled model, the mutual hydrodynamic influences of different portions of the robot system as well as the hydrological factors of the undersea environment for the robot operation are incorporated in the model.

关键词： tethered underwater robot umbilical cable ducted propeller fuzzy sliding mode control CFD trajectory and attitude control

Prevention and forecasting of rock burst hazards in coal mines

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Mining Science and Technology 2009年第5期19卷 585-591页

作者： dou Lin-ming LU Cai-ping MU Zong-long GAO ming-shi State Key Laboratory for Coal Resource and Mine Safety China University of Mining ＆ Technology Xuzhou Jiangsu 221008 China

Rock bursts signify extreme behavior in coal mine strata and severely threaten the safety of the lives of miners, as well as the effectiveness and productivity of miners. In our study, an elastic-plastic-brittle model for the deformation and failure of coal/rock was established through theoretical analyses, laboratory experiments and field testing, simulation and other means, which perfectly predict sudden and delayed rock bursts. Based on electromagnetic emission (EME), acoustic emission (AE) and microseism (MS) effects in the process from deformation until impact rupture of coal-rock combination samples, a multi-parameter identification of premonitory technology was formed, largely depending on these three forms of emission. Thus a system of classification for forecasting rock bursts in space and time was established. We have presented the intensity weakening theory for rock bursts and a strong-soft-strong (3S) structural model for controlling the impact on rock surrounding roadways, with the objective of laying a theoretical foundation and establishing references for parameters for the weakening control of rock bursts. For the purpose of prevention, key technical parameters of directional hydraulic fracturing are revealed. Based on these results, as well as those from deep-hole controlled blasting in coal seams and rock, integrated control techniques were established and anti-impact hydraulic props, suitable for roadways subject to hazards from rockbursts have also been developed. These technologies have been widely used in most coal mines in China, subject to these hazards and have achieved remarkable economic and social benefits.

关键词： rock bursts elastic-plastic-brittle model multi-parameter premonitory intensity weakening strong-soft-strong (3S) structure directional hydraulic fracturing anti-impact hydraulic prop

Numerical Simulation of Root Growth Dynamics of CO_2-Enriched Hybrid Rice Cultivar Shanyou 63 Under Fully Open-Air Field Conditions

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Journal of Integrative Agriculture 2013年第5期12卷 781-787页

作者： SUN Cheng-ming LIU Tao GUO dou-dou ZHUANG Heng-yang WANG Yu-long ZHU Jian-guo Key Lab of Crop Cultivation & Physiology Jiangsu Province/Agricultural CollegeYangzhou University Institute of Soil Science Chinese Academy of Sciences

Hybrid indica rice （Oryza sativa L.） cultivars play an important role in rice production system due to its heterosis, resistance to environmental stress, large panicle, and high yield potential. However, no attention has been given to its root growth dynamic responses to rising atmospheric CO2 concentration （[CO2]） in conjunction with nitrogen （N） availability. Free air COz enrichment （FACE） and N have significant effects on rice root growth. In this experiment, a hybrid cultivar Shanyou 63 （Oryza sativa L.） was used to study the effects of FACE and N levels on roots growth of rice. The results showed a significant increase in both adventitious root volume （ARV） and adventitious root dry weight （ARD） under the FACE treatment. The application of nitrogen also increased ARV and ARD, but the increase was smaller than that under FACE treatment. On the basis of the FACE experiment, numerical models for rice adventitious root volume and dry weight were built with the time as the driving factor. The models illustrated the dynamic development of rice adventitious root volume and dry weight after transplanting, regulated either by the influence factor of atmospheric [CO2] or by N application. The models were successfully used to predict ARV and ARD under FACE treatment in a different year with the predicted data being closely related to the actual experimental data. The model had guiding significance to growth regulation of rice root under the condition of atmospheric [CO2] rising in the future.

关键词： hybrid indica rice free air C02 enrichment (FACE) root volume root dry weight numerical model

Directly electrospinning submillimeter continuous fibers on tubes to fabricate H2S detectors with fast and high response

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Nano Materials Science 2022年第4期4卷 376-382页

作者： Xutao Ning dou Tang ming Zhang Hunan Provincial Key Laboratory of Fine Ceramics and Powder Materials School of Materials and Environmental EngineeringHunan University of HumanitiesScience and TechnologyLoudiChina College of Resources&Environment Hunan Agricultural UniversityChangsha410128China School of Physics and Electronics Hunan UniversityChangsha410082China

The fast and high response detection of neurotoxic H_(2)S is of great importance for the *** this paper,directly electrospinning technology on the ceramic tube is developed to improve the response of H_(2)S detector based on superlong SnO_(2)*** submillimeter continuous fibers are deposited directly on ceramic tubes by in-situ electrospinning method and can keep morphology of fibers during *** employing this technology,CuO-doped SnO_(2)fiber H_(2)S detectors are fabricated,and 10%atom CuO-doped SnO_(2)H_(2)S detector shows the highest response of 40 toward 1 ppm H_(2)S at 150℃while the response is only 3.6 for the H_(2)S detector prepared in traditional *** addition,the in-situ electrospinning H_(2)S detectors show faster response and recovery compared to the H_(2)S detectors fabricated by the conventional *** high and fast response of H_(2)S detectors based on in-situ electrospinning can be ascribed to the continuous fiber structure and CuO *** present in-situ electrospinning technology may provide a new strategy for the development of other gasdetectors and bio-detectors with fast and high response.

关键词： Submillimeter continuous fibers H2S detectors In-situ fabrication

The research on the substitution effect between the wireless and fixed telecommunication industry

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The Journal of China Universities of Posts and Telecommunications 2006年第3期13卷 102-106页

作者： dou Cai-lan long Xiao-yu Department of Economics and Management Xi'an Institute of Posts and Teleconununications Xi'an 710061 China

Wireless telecommunication has developed at a rapid pace than the fixed telecommunication since the last decades of twentieth century. This article analyzes the effect wireless mobile telecom substitutes for the fixed telecom by employing the normal theory of substitution and econometrics model. The analytical results are consistent with the reality, and it has been observed that the relation between the wireless and fixed telecommunication industry has changed from state of being complementary in the early last decades of twentieth century to that of being substituted at present. Moreover, the enhanced progress of telecommunication technology especially in wireless areas enriches customers＇ demands in terms of multimedia contents thereby changing their communication style, which significantly promotes the rapid growth of wireless mobile communication and strengthens the effect of the substitute.

关键词： effect of substitute wireless telecommunication,fixed telecommunication telecommunication industry

An X-Ray Study of Lobe-Dominated Radio-Loud Quasars with XMM-Newton

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Chinese Journal of Astronomy and Astrophysics 2008年第6期8卷 653-670页

作者： Li-ming dou Wei-Min Yuan National Astronomical Observatories/Yunnan Observatory Chinese Academy of Sciences Kunming 650011 China Graduate School of Chinese Academy of Sciences Beijing 100049 China

We report on our results of X-ray spectral analysis for a sample of radio-loud quasars covering a wide range of the radio core-dominance parameter, R, from core- dominated to lobe-dominated objects, using data obtained mostly with the XMM-Newton Observatory. We find that the spectral shape of the underlying power-law continuum is flat even for the lobe-dominated objects （average photon index ~ 1.5）, indistinguishable from that of core-dominated quasars. For lobe-dominated objects, contribution of X-rays from the jets is expected to be very small based on previous unification schemes, more than one order of magnitude lower than the observed X-ray luminosities. Assuming that radio-loud quasars follow the same X-ray-UV/optical luminosity relation for the disk-corona emission as found for radio-quiet quasars, we estimate the X-ray flux contributed by the disk-corona component from the optical/UV continuum. We find that neither the luminosity, nor the spectral shape, of the disk-corona X-ray emission can account for the bulk of the observed X-ray properties. Thus in lobe-dominated quasars, either the disk-corona X-ray emission is much enhanced in strength and flatter in spectral shape （photon index - 1.5） compared to normal radio-quiet quasars, or their jet X-ray emission is much enhanced compared to their weak radio core-jet emission. If the latter is the case, our result may imply that the jet emission in X-rays is less Doppler beamed than that in the radio. As a demonstrating example, we test this hypothesis by using a specific model in which the X-ray jet has a larger opening angle than the radio jet.

关键词： galaxies active quasars general galaxies X-ray galaxies radio continuum