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Enhanced Ferroelectric Properties of Predominantly (100)-oriented Ca_(0.4)Sr_(0.6)Bi_4Ti_4O_(15) Thin Films on Pt/Ti/SiO_2/Si Substrates

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Journal of Materials Science & Technology 2010年第11期26卷 981-985页

作者： Suhue Fan Quande Che Fengqing Zhang Ran yu wei hu College of Material Science and Engineering Shandong Jianzhu University Jinan 250101 China

Predominantly （100）-oriented Ca0.4Sr0.6Bi4Ti4O15 （C0.4S0.6BTi） thin films were prepared on Pt （111）/Ti/SiO2/Si substrates by a sol-gel method at annealing temperatures ranging from 650 to 850 ℃.The growth mode of the predominantly （100）-oriented C0.4S0.6 BTi thin films fabricated by the sequential layer annealing was discussed based on the structure evolution with the annealing *** remnant polarization and coercive field of the C0.4S0.6 BTi film annealed at 800 ℃ are 16.1 μC/cm 2 and 85 kV/cm,*** evident fatigue can be observed after 10 9 switching cycles.

关键词： Ca0.4Sr0.6Bi4Ti4O15 Ferroelectric film Orientation

A Crystalline Supramolecular Rotor Functioned by Dual Ultrasmall Polar Rotators

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Chinese Journal of Chemistry 2022年第16期40卷 1917-1923页

作者： Wang Li De-Xuan Liu wei-yu hu Qing-Yan Liu Zi-Yi Du Chun-Ting He wei-Xiong Zhang Xiao-Ming Chen College of Chemistry and Chemical Engineering MOE Key Laboratory of Fluorine and Silicon for Energy Materials and ChemistryJiangxi Normal UniversityNanchangJiangxi330022 China School of Chemistry MOE Key Laboratory of Bioinorganic and Synthetic ChemistrySun Yat-Sen UniversityGuangzhouGuangdong510275 China

As an extended model of conventional molecular rotors,a conceived construction of novel crystalline molecular rotor that simultaneously contains two discrete polar rotators is presented *** supramolecular self-assembly of 18-crown-6 host and two rotator-containing ion-pair guests affords a three-in-one cocrystal,(2-NH_(3)-iBuOH)(18-crown-6)[ZnBr_(3)(H_(2)O)],in which the hydroxyl group and aqua ligand both function as ultrasmall polar *** the basis of the variable-temperature single-crystal X-ray diffraction,variable-temperature/frequency dielectric response,density functional theory calculations,and molecular dynamics simulations,it is found that such dual polar rotators experience a gradually enhanced rotation with increasing temperature,and more importantly,could be controlled by a reversible polar-to-polar structural phase transition,i.e.,from a“single-(polar rotator)”state at low-temperature phase to a“mixed-dual-(polar rotator)”state in the vicinity of transition,and to an unusual“synchronized-dual-(polar rotator)”state at high-temperature phase.

关键词： Molecular rotor Host-guest system Dielectric relaxation Molecular dynamics Phase transition

Silencing of V-ATPase-E gene causes midgut apoptosis of Diaphorina citri and affects its acquisition of huanglongbing pathogen

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Insect Science 2023年第4期30卷 1022-1034页

作者： Chang-Fei Guo Jun-Hong Qiu yu-wei hu Pei-Ping Xu Ying-Qi Deng Ling Tian Yi-yun wei Wen Sang yu-Tao Liu Bao-Li Qiu Engineering Research Center of Biocontrol Ministry of Education and Guangdong ProvinceSouth China Agricultural UniversityGuangzhouChina Guangdong Laboratory for Lingnan Modern Agriculture GuangzhouChina Chongqing Key Laboratory of Vector Insects College of Life SciencesChongqing Normal UniversityChongqingChina Key Laboratory of South China Modern Biological Seed Industry MARANational S&T Innovation Center for Modern Agricultural IndustryGuangzhouChina College of Animal Science South China Agricultural UniversityGuangzhouChina

The Asian citrus psyllid,Diaphorina citri Kuwayama,is among the most im-portant pests of *** is the main vector of the huanglongbing(HLB)pathogen Can-didatus Liberibacter asiaticus(CLas),which causes severe losses in citrus *** of *** is therefore of paramount importance to reduce the spread of *** this re-gard,using RNA interference(RNAi)to silence target genes is a useful strategy to control *** this study,using RNAi,we examined the biological functions of the V-ATPase subunit E(V-ATP-E)gene of ***,including its effect on acquisition of *** amino acid sequence of V-ATP-E from *** had high homology with proteins from other insects.V-ATP-E was expressed at all *** life stages analyzed,and the expres-sion level in mature adults was higher than that of teneral *** of V-ATP-E resulted in a significant increase in mortality,reduced body weight,and induced cell apop-tosis of the *** *** reduced expression of V-ATP-E was indicated to inhibit CLas passing through the midgut and into the hemolymph,leading to a majority of CLas being confined to the *** addition,double-stranded RNA of *** V-ATP-E was safe to non-target parasitic *** results suggest that V-ATP-E is an effective RNAi target that can be used in *** control to block CLas infection.

关键词： apoptosis CLas infection Diaphorina citri RNA interference V-ATPase subunit E

Shape estimation for a TPU-based multi-material 3D printed soft pneumatic actuator using deep learning models

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Science China(Technological Sciences) 2024年第5期67卷 1470-1481页

作者： hu yu TANG wei QU Yang XU huXiu KRAMARENKO yu.Elena ZOU Jun State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang UniversityHangzhou310058China School of Mechanical Engineering Zhejiang UniversityHangzhou310027China Institute of Process Equipment College of Energy EngineeringZhejiang UniversityHangzhou310027China Faculty of Physics Lomonosov Moscow State UniversityMoscow119991Russia Enikolopov Institute of Synthetic Polymeric Materials of Russian Academy of Sciences Moscow117393Russia

Real-time proprioception presents a significant challenge for soft robots due to their infinite degrees of freedom and intrinsic *** studies mostly focused on specific sensors and *** is still a lack of generalizable technologies for integrating soft sensing elements into soft actuators and mapping sensor signals to proprioception *** tackle this problem,we employed multi-material 3D printing technology to fabricate sensorized soft-bending actuators(SBAs)using plain and conductive thermoplastic polyurethane(TPU)*** designed various geometric shapes for the sensors and investigated their strain-resistive performance during *** address the nonlinear time-variant behavior of the sensors during dynamic modeling,we adopted a data-driven approach using different deep neural networks to learn the relationship between sensor signals and system states.A series of experiments in various actuation scenarios were conducted,and the results demonstrated the effectiveness of this *** sensing and shape prediction steps can run in real-time at a frequency of50 Hz on a consumer-level ***,a method is proposed to enhance the robustness of the learning models using data augmentation to handle unexpected sensor *** the methods are efficient,not only for in-plane 2D shape estimation but also for out-of-plane 3D shape *** aim of this study is to introduce a methodology for the proprioception of soft pneumatic actuators,including manufacturing and sensing modeling,that can be generalized to other soft robots.

关键词： shape estimation soft sensors and actuators 3D printing deep learning in robotics

Drinking water quality & health risk assessment of secondary water supply systems in residential neighborhoods

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Frontiers of Environmental Science & Engineering 2024年第2期18卷 47-62页

作者： Yating wei Dong hu Chengsong Ye Heng Zhang Haoran Li Xin yu College of the Environment&Ecology Xiamen UniversityXiamen 361102China School of Public Health Shandong First Medical University&Shandong Academy of Medical SciencesJinan 250117China

Secondary water supply systems(SWSSs)are important components of the water supply infrastructure that ensure residents’drinking water *** are characterized by long detention time,warm temperature,and unreasonable management,which may trigger the deterioration of water quality and increase *** this study,drinking water quality index(DWQI)and health risk assessment(HRA)were selected and modified to quantitatively assess the water quality and health risks of SWSSs in residential *** total,121 seasonal water samples were *** was observed that the water quality was excellent with the DWQI of 0.14±0.04,excluding one sample,which was extremely poor owing to its excessive total bacterial *** HRA results revealed that the health risks were low:negligible non-carcinogenic risk for any population;negligible and acceptable carcinogenic risk for children aged 6–17 and ***,samples revealed higher carcinogenic risk(7.63×10−5±3.29×10−6)for children aged 0–5,and arsenic was the major *** samples had poor water quality and higher health risks,which called for *** further investigate the water quality and health risks of SWSSs,monthly sampling was conducted during *** 24 water samples were qualified in Chinese standard(GB 5749-2022)and characterized as excellent *** HRA results were consistent with the seasonal samples’and the health risks were mainly concentrated in ***,our study provides a suitable framework for water quality security,advice for managers,and references for administrators in other cities.

关键词： Drinking water quality Water quality index Health risk assessment Secondary water supply systems Heavy metals

Contribution of Surface Waves to Sea Surface Temperatures in the Arctic Ocean

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Journal of Ocean University of China 2024年第5期23卷 1151-1162页

作者： wei Meng SHAO weizeng SHEN wei hu yuyi ZHANG yu ZUO Juncheng College of Oceanography and Ecological Science Shanghai Ocean University China Waterborne Transport Research Institute Ministry of Transport of the People's Republic of China

The aim of our study was to examine the contribution of surface waves from WAVEWATCH-III(WW3) to the variation in sea surface temperature(SST) in the Arctic Ocean. The simulated significant wave height(SWH) were validated against the products from Haiyang-2B(HY-2B) in 2021, obtaining a root mean squared error(RMSE) of 0.45 with a correlation of 0.96 and scatter index of 0.18. The wave-induced effects, i.e., wave breaking and mixing induced by nonbearing waves resulting in changes in radiation stress and Stokes drift, were calculated from WW3, ERA-5 wind, SST, and salinity data from the National Centers for Environmental Prediction and were taken as forcing fields in the Stony Brook Parallel Ocean Model. The results showed that an RMSE of 0.81℃ with wave-induced effects was less than the RMSE of 1.11℃ achieved without the wave term compared with the simulated SST with the measurements from Argos. Considering the four wave effects and sea ice freezing, the SST in the Arctic Ocean decreased by up to 1℃ in winter. Regression analysis revealed that the SWH was linear in SST(values without subtraction of waves) in summer and autumn, but this behavior was not observed in spring or winter due to the presence of sea ice. The interannual variation also presented a negative relationship between the difference in SST and SWH.

关键词： Arctic Ocean sea surface temperature sea surface wave

A management information system for mine railway transportation equipment

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Journal of China University of Mining and Technology 2008年第3期18卷 373-376页

作者： LI Mei-yu HAN Ke-qi ZHANG Xiao-yong LI Xiao-lin ZHAI Yong-jun yu wei-hu School of Mines China University of Mining ＆ Technology Xuzhou Jiangsu 221008 China Railway Operators and Manufacturers of Shanxi Luan Mining Group Company Changzhi Shanxi 046000 China

Good equipment management is essential for the day to day management of an enterprise. Targeted at production opera-tion of the railway transportation department of a mining group and aimed at mine railway equipment management, we have estab-lished a management information system for the equipment in the entire process of the life cycle of equipment. The project deals with basic data about equipment, initial management, maintenance, operation and even disposal, based on a C/S and B/S structure. We adopted an object-oriented approach, dealing with software engineering, information engineering, economic and organizational measures. Thus, effective monitoring and control of the operation of railway equipment and its status in the entire process has been achieved.

关键词： mine railway transportation equipment management information system

Comparative analysis of thermodynamic and mechanical responses between underground hydrogen storage and compressed air energy storage in lined rock caverns

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International Journal of Mining Science and Technology 2024年第4期34卷 531-543页

作者： Bowen hu Liyuan yu Xianzhen Mi Fei Xu Shuchen Li wei Li Chao wei Tao Zhang State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering China University of Mining and TechnologyXuzhou 221116China Key Laboratory of Large Structure Health Monitoring and Control Shijiazhuang Tiedao UniversityShijiazhuang 050043China School of Mechanics and Civil Engineering China University of Mining and TechnologyXuzhou 221116China

Underground hydrogen storage(UHS)and compressed air energy storage(CAES)are two viable largescale energy storage technologies for mitigating the intermittency of wind and solar ***,it is meaningful to compare the properties of hydrogen and air with typical thermodynamic storage *** study employs a multi-physical coupling model to compare the operations of CAES and UHS,integrating gas thermodynamics within caverns,thermal conduction,and mechanical deformation around rock *** thermodynamic responses are validated using additional simulations and the field test *** and pressure variations of air and hydrogen within rock caverns exhibit similarities under both adiabatic and diabatic simulation *** reaches higher temperature and pressure following gas charging stage compared to air,and the ideal gas assumption may lead to overestimation of gas temperature and *** steel lining of CAES,the sealing layer(fibre-reinforced plastic FRP)in UHS is prone to deformation but can effectively mitigates stress in the sealing *** CAES,the first principal stress on the surface of the sealing layer and concrete lining is tensile stress,whereas UHS exhibits compressive stress in the same *** present research can provide references for the selection of energy storage methods.

关键词： Underground hydrogen storage Compressed air energy storage Mechanical response Thermodynamic response Lined rock caverns

Physics of cavitation near particles

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Journal of Hydrodynamics 2024年第1期36卷 102-118页

作者： Jia-xin yu Xiao-yu Wang Jun-wei Shen Jin-sen hu Xiang-qing Zhang Da-qing He yu-ning Zhang Key Laboratory of Power Station Energy Transfer Conversion and System(Ministry of Education) School of Energy Power and Mechanical EngineeringNorth China Electric Power UniversityBeijing102206China

The combined effect of cavitation and silt abrasion presents a great challenge and threat to secure the operation and the efficiency of hydraulic machineries working in sediment-laden *** present paper critically reviews the current research progress on the interaction mechanisms of the bubbles and the ***,the analytical models including boundary treatment methods for predicting the jet dynamics of the bubble collapse near particles are ***,the bubble collapsing dynamics,jet dynamics and shock wave characteristics near particles are revealed both experimentally and ***,the bubble-particle-wall system is investigated with a focus on microjets.

关键词： Cavitation bubble particle jet shock wave