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Controllable synthesis of biomimetic wood stem nanoporous high entropy oxides catalysts for oxygen evolution reaction

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Nano Research 2025年第1期18卷 107-117页

作者： Wei wang weiqi wang Huihui wang Xing Lu Jinwen Zhang Yunzhuo Lu School of Materials Science and Engineering Dalian Jiaotong UniversityDalian 116028China School of Intelligence and Electronic Engineering Dalian Neusoft University of InformationDalian 116023China Guangdong Key Laboratory of Materials and Equipment in Harsh Marine Environment Guangzhou Maritime UniversityGuangzhou 510725China

Bubbles generated during the oxygen evolution reaction(OER)in water splitting readily adhere to the electrode surface,thereby impeding contact between the electrolyte and the active sites,thereby increasing the ***,it is imperative to elucidate the bubble release behavior and engineer electrodes that facilitate faster bubble *** this study,inspired by the wood stem of the Norway spruce,we synthesized a gradient nanoporous high-entropy oxide(GNP-HEO)electrode with a controllable pore *** GNP-HEO,featuring a well-controlled gradient in pore size,is achieved through a straightforward strategy combining selective laser melting with selective phase *** unique gradient nanoporous structure not only facilitates bubble release but also diminishes the bubble shielding effect in OER,thereby enhancing electrocatalytic *** affect interaction of Al,Co,Cr,Fe,and Ni,coupled with the gradient nanoporous structure,yields exceptional OER performance,evidenced by an overpotential of 250 mV at a current density of 50 mA/cm^(2) and a Tafel slope of 38.0 mV/dec in 1 M *** functional theory calculations confirm that the GNPHEO adheres to the adsorbate evolution mechanism reaction pathway and exhibits significant *** work highlights a promising approach for the design and synthesis of high-performance OER electrocatalysts.

关键词： oxygen evolution reaction high-entropy oxides selective phase dis-solution selective laser melting gradient nanoporous

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Urban Stormwater Modeling with Local Inertial Approximation Form of Shallow Water Equations: A Comparative Study

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International Journal of Disaster Risk Science 2021年第5期12卷 745-763页

作者： weiqi wang Wenjie Chen Guoru Huang School of Civil Engineering and Transportation South China University of TechnologyGuangzhou 510640China State Key Laboratory of Subtropical Building Science School of Civil Engineering and TransportationSouth China University of TechnologyGuangzhou 510640China Guangdong Engineering Technology Research Center of Safety and Greenization for Water Conservancy Project Guangzhou 510640China

This study focused on the performance and limitations of the local inertial approximation form model(LIM)of the shallow water equations(SWEs)when applied in urban flood modeling.A numerical scheme of the LIM equations was created using finite volume method with a first-order spatiotemporal Roe Riemann solver.A simplified urban stormwater model(SUSM)considering surface and underground dual drainage system was constructed based on LIM and the US Environmental Protection Agency Storm Water Management ***,a complete urban stormwater model(USM)based on the SWEs with the same solution algorithm was used as the evaluation *** results of the SUSM and USM in a highly urbanized area under four rainfall return periods were analyzed and *** results reveal that the performance of the SUSM is highly consistent with that of the USM but with an improvement in computational efficiency of approximately 140%.In terms of the accuracy of the model,the SUSM slightly underestimates the water depth and velocity and is less accurate when dealing with supercritical flow in urban stormwater flood ***,the SUSM can produce comparable results to USM with higher computational efficiency,which provides a simplified and alternative method for urban flood modeling.

关键词： Comparative study Finite volume method Local inertial approximation form Shallow water equations Urban stormwater model

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Extremely low friction on gold surface with surfactant molecules induced by surface potential

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Friction 2023年第4期11卷 513-523页

作者： Tianyang GAO Jinjin LI weiqi wang Jianbin LUO State Key Laboratory of Tribology Tsinghua UniversityBeijing 100084China

An extremely low friction state was observed on the gold surface induced by applying a specific negative potential in cationic surfactant *** friction force showed a remarkable reduction from 8.3 to 3.5×10−2 nN(reduced by 99.6%)with increasing the period of negative applied potential,and the final friction coefficient could reduce down to 3×10−*** extremely low friction state was robust,and it also exhibited an excellent load bearing capacity,which cannot be damaged by a high ***,the extremely low friction state achieved under negative applied potential could keep stable even after the removal of potential,but failed in a short time,once a specific positive potential was *** was demonstrated that there was a stable electro-adsorption of surfactant molecules on the gold surface induced by applying a negative potential,leading to the formation of a bilayer structure on the gold *** hydration layers of the bilayer on the gold surface and micelles on the silica probe provided a shear plane with an extremely low shear strength,leading to the extremely low friction state on the gold *** study provides a method to achieve extremely low friction state by applied potential.

关键词： extremely low friction applied potential surfactant load bearing capacity

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Theoretical Model of Dynamic Bulk Modulus for Aerated Hydraulic Fluid

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Chinese Journal of Mechanical Engineering 2022年第5期35卷 183-193页

作者： Xiaoming Yuan weiqi wang Xuan Zhu Lijie Zhang Hebei Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Yanshan UniversityQinhuangdao 066004China Key Laboratory of Advanced Forging&Stamping Technology and Science Ministry of Education of ChinaYanshan UniversityQinhuangdao 066000China State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang UniversityHangzhou 310027China

Existing models of bulk modulus for aerated hydraulic fluids primarily focus on the effects of pressure and air fraction,whereas the effect of temperature on bulk modulus is *** on the lumped parameter method and the full cavitation model,combined with the improved Henry’s law and the air polytropic course equation,a theoretical model of dynamic bulk modulus for an aerated hydraulic fluid is *** effects of system pressure,air fraction,and temperature on bulk modulus are investigated using the controlled variable *** results show that the dynamic bulk modulus of the aerated hydraulic fluid is inconsistent during the compression *** the same pressure point,the dynamic bulk modulus during expansion is higher than that during *** the same initial air faction and pressure changing period,a higher temperature results in a lower dynamic bulk *** the pressure is lower,the dynamic bulk modulus of each temperature point is more similar to each *** comparing the theoretical results with the actual dynamic bulk modulus of the Shell Tellus S ISO32 standard air-containing oil,the goodness-of-fit between the theoretical model and experimental value at three temperatures is 0.9726,0.9732,and 0.9675,which validates the theoretical *** this study,a calculation model of dynamic bulk modulus that considers temperature factors is *** predicts the dynamic bulk modulus of aerated hydraulic fluids at different temperatures and provides a theoretical basis for improving the analytical model of bulk modulus.

关键词： Aerated hydraulic fluid Dynamic bulk modulus Theory model Air fraction Pressure

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Crack evolution of soft–hard composite layered rock-like specimens with two fissures under uniaxial compression

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Frontiers of Structural and Civil Engineering 2021年第6期15卷 1372-1389页

作者： Dong ZHOU Yicheng YE Nanyan HU weiqi wang Xianhua wang School of Resources and Environmental Engineering Wuhan University of Science and TechnologyWuhan 430081China Hubei Key Laboratory for Efficient Utilization and Agglomeration of Metallurgic Mineral Resources Wuhan 430081China Sinosteel Wuhan Safety and Environmental Protection Research Institute Co. Ltd.Wuhan 430081China

Acoustic emission and digital image correlation were used to study the spatiotemporal evolution characteristics of crack extension of soft and hard composite laminated rock masses(SHCLRM)containing double fissures under uniaxial *** effects of different rock combination methods and prefabricated fissures with different orientations on mechanical properties and crack coalescence patterns were *** characteristics of the acoustic emission source location distribution,and frequency changes of the crack evolution process were also *** test results show that the damage mode of SHCLRM is related to the combination mode of rock layers and the orientation of *** layers predominantly produce tensile cracks;soft layers produce shear *** first crack always sprouts at the tip or middle of prefabricated fractures in hard *** acoustic emission signal of SHCLRM with double fractures has clear stage characteristics,and the state of crack development can be inferred from this signal to provide early warning for rock fracture *** study can provide a reference for the assessment of the fracture development status between adjacent roadways in SHCLRM in underground mines,as well as in roadway layout and support.

关键词： soft−hard composite layered rock mass double cracks crack evolution acoustic emission digital image correlation

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Apoptosis of T-47D Cells Induced by Cinobufacini via a Caspase-3-dependent Manner

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Chemical Research in Chinese Universities 2014年第1期30卷 108-113页

作者： wang weiqi SHI Aiping FAN Zhimin Department of Breast Surgery the First Hospital of Jilin University Changchun 130021 P. R. China

To investigate the mechanism of the anti-tumor activity of cinobufacini on the breast cancer cell line T-47D,the inhibitory effect of cinobufacini on the proliferation of T-47D was detected via MTT assay and the morphological changes of T-47D and HBL-100 cells caused by cinobufacini were observed with an inverted *** apoptosis and cell cycle stages were detected by flow cytometry *** effects of cinobufacini on the expression of active-form and pro-form of caspase-3 were assessed by Western blot *** dramatically inhibited T-47D proliferation in a dose-and time-dependent *** found that more than 20％ of T-47D cells were killed after treatment with 20 mg/mL cinobufacini for 24 h in *** 6 d of treatment with 20 mg/mL cinobufacini,the cell survival rate decreased by more than 40％.Flow cytometric analysis demonstrated that cinobufacini induced significant apoptosis and changes of the cell cycle distribution of T-47D *** used breast cell line HBL-100 as the control,the above experiments except cell cycle analysis showed that cinobufacini more obviously induced the apoptosis of T-47D cells than that of HBL-100 *** blot analysis confirmed the protein expression of active caspase-3 increased with increasing the dose of *** results indicate that cinobufacini induces the apoptosis of T-47D cells via the up-regulation of caspase-3.

关键词： Breast cancer cell Cinobufacini Apoptosis Caspase-3

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Joint spectrogram segmentation and ridge-extraction method for separating multimodal guided waves in long bones

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Science China(Physics,Mechanics & Astronomy) 2013年第7期56卷 1317-1323页

作者： ZHANG ZhengGang XU KaiLiang TA DeAn wang weiqi Department of Electronic Engineering Fudan University

Ultrasonic guided waves (GWs) can be used to evaluate long bones effectively because of the ability to provide the information of the whole bone. In this study, a joint spectrogram segmentation and ridge-extraction (JSSRE) method was proposed to separate multiple modes in long bones. First, the Gabor time-frequency transform was applied to obtain the spectrogram of multimodal signals. Then, a multi-class image segmentation algorithm was used to find the corresponding region of each mode in the spectrogram, including an improved watershed transform and a region growing procedure. Finally, the ridges were extracted and the time domain signals representing individual modes were reconstructed from these ridges in each region. The validations of this method were discussed by simulated multimodal signals with different signal-to-noise ratios (SNR). The correlation coefficients between the original signals without noise and the reconstructed signals were calculated to analyze the results quantitatively. The results showed that the extracted ridges were in good agreement with generated theoretical dispersion curves, and the reconstructed signals were highly related to the original signals, even under the SNR=3 dB situation.

关键词： multimodal guided waves long bone spectrogram segmentation

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3D DEM simulation of hard rock fracture in deep tunnel excavation induced by changes in principal stress magnitude and orientation

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第10期16卷 3870-3884页

作者： weiqi wang Xia-Ting Feng Qihu wang Rui Kong Chengxiang Yang Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines Northeastern UniversityShenyang110819China Hubei Key Laboratory for Efficient Utilization and Agglomeration of Metallurgic Mineral Resources Wuhan430081China

To achieve the loading of the stress path of hard rock,the spherical discrete element model(DEM)and the new flexible membrane technology were utilized to realize the transient loading of three principal stresses with arbitrary magnitudes and ***,based on the deep tunnel of China Jinping Underground Laboratory II(CJPL-II),the deformation and fracture evolution characteristics of deep hard rock induced by excavation stress path were analyzed,and the mechanisms of transient loading-unloading and stress rotation-induced fractures were revealed from a mesoscopic *** results indicated that the stressestrain curve exhibits different trends and degrees of sudden changes when subjected to transient changes in principal stress,accompanied by sudden changes in strain *** rotation induces spatially directional deformation,resulting in fractures of different degrees and orientations,and increasing the degree of deformation *** correlation between the degree of induced fracture and the unloading magnitude of minimum principal stress,as well as its initial level is significant and *** process of mechanical response during transient unloading exhibits clear nonlinearity and *** transient unloading,both the minimum principal stress and minimum principal strain rate decrease sharply and then tend to *** occurs from the edge to the interior and from the direction of the minimum principal stress to the direction of the maximum principal stress on theε1-ε3 *** unloading will induce a tensile stress *** ability to induce fractures due to changes in principal stress magnitude,orientation and rotation paths gradually *** analysis indicates a positive correlation between the abrupt change amplitude of strain rate and the maximum unloading magnitude,which is determined by the magnitude and rotation of principal stress.A high tensile strain rate is more likely to induce fractures u

关键词： Deep hard rock tunnel Three-dimensional(3D)discrete element model(DEM) Magnitude and orientation of principal stress Transient unloading Fracture mechanism

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Effect of selected signals of interest on ultrasonic backscattering measurement in cancellous bones

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Science China(Physics,Mechanics & Astronomy) 2013年第7期56卷 1310-1316页

作者： LIU ChengCheng HAN HaiJie TA DeAn wang weiqi Department of Electronic Engineering Fudan University

This study examined how the signals of interest （SOI） effect on the backscattering measurement numerically based on 3-D finite-difference time-domain （FDTD） method. High resolution microstructure mappings of bovine cancellous bones provided by micro-CT were used as the input geometry for simulations. Backscatter coefficient （BSC）, integrated backscatter coefficient （IBC） and apparent integrated backscatter （AIB） were calculated with changing the start （L1） and duration （L2） of the SOl. The results demonstrated that BSC and IBC decrease as L1 increases, and AIB decreases more rapidly as L1 increases. The backscattering parameters increase with fluctuations as a function of L2 when L2 is less than 6 mm. However, BSC and IBC change little as L2 continues to increase, while AIB slowly decreases as L2 continues to increase. The results showed how the selections of the SOI effect on the backscattering measurement. An explicit standard for SOl selection was proposed in this study and short L1 （about 1.5 mm） and appropriate L2 （6 mm-12 mm） were recommended for the calculations of backscattering parameters.

关键词： ultrasonic backscattering cancellous bone FDTD simulation signals of interest backscattering parameters

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A multi-objective power flow optimization control strategy for a power split plug-in hybrid electric vehicle using game theory

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Science China(Technological Sciences) 2021年第12期64卷 2718-2728页

作者： wang WeiDa wang weiqi YANG Chao LIU Cheng YANG LiuQuan SUN XiaoXia XIANG ChangLe School of Mechanical Engineering Beijing Institute of TechnologyBeijing 100081China Key Laboratory of Vehicle Transmission Beijing 100081China China North Vehicle Research Institute Beijing 100072China

Power flow optimization control,which governs the energy flow among engine,battery,and motor,plays a very important role in plug-in hybrid electric vehicles(PHEVs).Its performance directly affects the fuel economy of *** the purpose of improving fuel economy,the electric system including battery and motor will be frequently scheduled,which would affect battery ***,a multi-objective optimization mechanism taking fuel economy and battery life into account is necessary,which is also a research focus in field of hybrid *** by this issue,this paper proposes a multi-objective power flow optimization control strategy for a power split PHEV using game ***,since the demand power of driver which is necessary for the power flow optimization control,cannot be known in advance,the demand power of driver can be modelled using a Markov chain to obtain predicted demand ***,based on the predicted demand power,the multi-objective optimization control problem is transformed into a game problem.A novel non-cooperative game model between engine and battery is established,and the benefit function with fuel economy and battery life as the optimization objective is ***,under the premise of satisfying various constraints,the participants of the above game maximize their own benefit function to obtain the Nash equilibrium,which comprises of optimal power split ***,the proposed strategy is verified compared with two baseline strategies,and results show that the proposed strategy can reduce equivalent fuel consumption by about 15%compared with baseline strategy 1,and achieve similar fuel economy while greatly extend battery life simultaneously compared with baseline strategy 2.

关键词： power split PHEV power flow optimization control multi-objective game theory battery life

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