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Surface-anchoring zwitterionic antioxidant enables efficient,stable,and scalable all-perovskite tandem solar cells

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Science China Chemistry 2021年第1期64卷 3-4页

作者： Xiaoyu Yang rui zhu State Key Laboratory for Artificial Microstructure and Mesoscopic Physics School of PhysicsFrontiers Science Center for Nano-optoelectronics&Collaborative Innovation Center of Quantum MatterPeking UniversityBeijing 100871China Peking University Yangtze Delta Institute of Optoelectronics Nantong 226010China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China

Lead-halide perovskite photovoltaics(PVs)have achieved impressive progress in power conversion efficiencies(PCEs)over the past ten years,accelerating their step forward to next-generation commercial PV technologies[1].As a leading candidate for perovskite PVs,monolithic all-perovskite tandem solar cells(PTSCs)have achieved the best24.8%for small-area devices(0.049 cm^2)in 2019。

关键词： perovskite enable impressive

Mobilities and leachabilities of heavy metals in sludge with humus soil

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Journal of Environmental Sciences 2011年第2期23卷 247-254页

作者： rui zhu Min Wu Jian Yang State Key Laboratory of Pollution Control and Resources Reuse Tongji University Shanghai 200092 China.

Chemical forms of Zn, Ni, Cu, and Pb in municipal sewage sludge were investigated by adding humus soil to sludge and by performing sequential extraction procedures. In the final sludge mixtures, Zn and Ni were mainly found in Fe/Mn oxide-bound （F3） and organic matter/sulfide-bound （F4） forms. For Zn, exchangeable （F1）, carbonate-bound （F2）, and F3 forms were transformed to F4 and residual forms （F5）. For Ni, F1 and F2 forms were transformed to F1, F2, and F3 forms. Both Cu and Pb were strongly associated with the stable forms F4 and F5. For Cu, F2 and F3 forms were major contributors, while for Pb, F3 and F4 forms were major contributors to F5. Humus soil dosage and pH conditions in the sludge were strongly correlated with the forms of heavy metals. Five forms were used to evaluate metal mobilities in the initial and final sludge mixtures. The mobilities of the four heavy metals studied decreased after 28 days. The metal mobilities in the final sludge mixtures were ranked in the following order： Ni 〉 Zn 〉 Cu = Pb. Leaching tests showed that the mobilities of Zn and Ni in lower pH conditions （pH 4） were higher than those in higher pH conditions （pH 8）.

关键词： sludge heavy metal humus soil mobility leachability

Film cooling performance and flow structure of single-hole and double-holes with swirling jet

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Chinese Journal of Aeronautics 2022年第3期35卷 201-213页

作者： rui zhu Simon TERRENCE Shulei LI Gongnan XIE School of Mechanical Engineering Northwestern Polytechnical UniversityXi’an 710072China Research&Development Institute of Northwestern Polytechnical University in Shenzhen Shenzhen 518057China Department of Mechanical Engineering University of MinnesotaMinneapolisMN 55455USA School of Marine Science and Technology Northwestern Polytechnical UniversityXi’an 710072China

This paper presents the results of a numerical study of the effects of swirling flow in coolant jets on film cooling *** combined-hole designs with swirling coolant flow entering the delivery hole are proposed and *** film cooling effectiveness values for cases with various blowing ratios are *** flow structures and underlying mechanisms are *** results show that film cooling effectiveness is improved with jet swirl at high blowing ratios,and that swirl strength has significant influence on film cooling ***-hole designs can further improve film cooling performance using swirling jets due to mixing of coolant flows and interaction of *** largest improvements of area-averaged film cooling effectiveness for a single-hole swirl case and a combined-hole swirl case over corresponding non-swirling case results are 157%and 173%,respectively.

关键词： Combined-hole Film cooling Interactions of vortices Jet-in-cross-flow Swirling flow

Relay Selection Scheme for AF System with Partial CSI and Optimal Stopping Theory

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Tsinghua Science and Technology 2020年第2期25卷 302-312页

作者： rui zhu Tao Li Jianxin Guo Yangchao Huang School of Information Engineering Xijing InstituteXi’an 710123China Institute of Information and Navigation Air Force Engineering UniversityXi’an 710008China Beijing Institute of Information Engineering Beijing 100085China Institute of Information and Navigation Air Force Engineering UniversityXi'an 710008China

Relay selection for Relay Assisted(RA)networks is an economical and effective method to improve the spectrum *** selection performs especially well when the source node has accurate and timely Channel State Information(CSI).However,since perfect CSI knowledge is rarely available,research of relay selection with partial(statistical)CSI is of paramount *** this paper,relay selection for RA networks with statistical CSI is formulated as a Multiple-Decision(MD)***,the cost of obtaining the CSI is also considered in the formulated *** relay selection schemes,Maximal Selection Probability(MSP)and Maximal Spectrum Efficiency Expectation(MSEE),are proposed to solve the formulated MD problem under different optimal criteria assumptions based on the optimal stopping *** MSP scheme maximizes the probability that the Best Assisted Relay Candidate(BARC)can be selected,whereas the MSEE scheme provides the maximal expectation of the spectrum *** results show that the proposed schemes effectively improve the spectrum efficiency,and the MSEE scheme is more suitable for stable communication ***,the MSP scheme is more suitable for burst communication cases.

关键词： Relay-Assisted(RA)network relay selection optimal stopping

Experimental and numerical study of installing a dune model in a 90° bend in the horizontal-vertical pneumatic conveying system

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Particuology 2023年第8期79卷 95-108页

作者： Zhenyu Yang Fei Yan Panpan Tu rui zhu School of Mechanical Engineering Jiangsu University of Science and TechnologyZhenjiang212000China School of Environmental and Chemical Engineering Jiangsu University of Science and TechnologyZhenjiang212000China

In the pneumatic conveying process,particles move to the bend under the influence of inertia to form a particle rope,which will cause serious wear between the particles and the pipe wall,and then the dune model is designed and installed in the 90° bend to reduce energy consumption and wear in this ***,the minimum pressure drop velocity of particles transported by different size dune models was obtained through experimental *** the energy saving mechanism of the dune model is studied by CFD-DEM *** experimental results show that the installation of the dune model reduces the minimum pressure drop *** numerical simulation results show that the number of collisions between the particles and the tube wall in the vertical tube decreases after the installation of the dune model,which reduces the energy ***,the increasing of tail size of the dune model is beneficial to the diffusion and acceleration of the particles in the vertical tube.

关键词： Pneumatic conveying Dune model CFD-DEM Minimum pressure drop velocity Recursiveanalysis

Optimal Energy Efficiency Based High-speed Flying Control Method for Hydraulic Quadruped Robot

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Journal of Bionic Engineering 2024年第3期21卷 1156-1173页

作者： Qingjun Yang Zhenyang Zhang rui zhu Dianxin Wang School of Mechatronics Engineering Harbin Institute of TechnologyHarbin150000China Nanjing Chenguang Group Co.Ltd Nanjing210006China

Herein,a control method based on the optimal energy efficiency of a hydraulic quadruped robot was proposed,which not only realizes the optimal energy efficiency of flying trot gait but also ensures the stability of high-speed ***,the energy consumption per unit distance was adopted as the energy efficiency evaluation index based on the constant pressure oil supply characteristics of the hydraulic system,and the global optimization algorithm was adopted to solve the optimal ***,the gait parameters that affect the energy efficiency of quadruped were analyzed and the mapping relationship between each parameter and energy efficiency was captured,so as to select the optimum combination of energy efficiency parameters,which is significant to improve endurance ***,to ensure the stability of the high-speed flying trot gait motion of the hydraulic quadruped robot,the active compliance control strategy was ***,the proposed method was successfully verified by simulations and *** experimental results reveal that the flying trot gait of the hydraulic quadruped robot can be stably controlled at a speed of 2.2 m/s.

关键词： Hydraulic quadruped robot Flying trot Energy efficiency Active compliance control

Reconfigurable mechanism-based metamaterials for ternary-coded elastic wave polarizers and programmable refraction control

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Applied Mathematics and Mechanics(English Edition) 2024年第7期45卷 1225-1242页

作者： Zhou HU Zhibo WEI Yan CHEN rui zhu School of Aerospace Engineering Beijing Institute of TechnologyBeijing100081China School of Mechanical Engineering Tianjin UniversityTianjin300350China Key Laboratory of Mechanism Theory and Equipment Design of Ministry of Education Tianjin UniversityTianjin300350China

Elastic metamaterials with unusual elastic properties offer unprecedented ways to modulate the polarization and propagation of elastic ***,most of them rely on the resonant structural components,and thus are frequency-dependent and ***,we present a reconfigurable 2D mechanism-based metamaterial which possesses transformable and frequency-independent elastic *** on the proposed mechanism-based metamaterial,interesting functionalities,such as ternarycoded elastic wave polarizer and programmable refraction,are ***,unique ternary-coded polarizers,with 1-trit polarization filtering and 2-trit polarization separating of longitudinal and transverse waves,are first ***,the strong anisotropy of the proposed metamaterial is harnessed to realize positive-negative bi-refraction,only-positive refraction,and only-negative ***,the wave functions with detailed microstructures are numerically verified.

关键词： elastic metamaterial elastic wave reconfigurable design zero mode ternary code programmable refraction

Shot Noise in Aharonov-Casher Rings

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Chinese Physics Letters 2010年第6期27卷 199-202页

作者： LIN Liang-Zhong zhu rui DENG Wen-Ji Department of Physics South China University of Technology Guangzhou 510640

We investigate the shot noise of electron transport through an Aharonov-Casher ring subject to the Rashba spin-orbit coupling （SOC）. Analytic expressions for the coefficients of reflection and transmission are derived by using the Griffith boundary conditions. For this kind of SOC, the ballistic transport of electrons can be analyzed as two independent spin channels, and both of them have the same transmission and reflection coefficients. The dependences of shot noise and Landauer-Biittiker conductance on controllable factors, including the strength of Rashba SOC, the asymmetrical angle of lead-connection positions, the radius of the rings, and the wave vector （or energy） of the incident Fermi electrons, are explicitly described by some new combined parameters. The ways that the shot noise and conductance vary with Rashba SOC and with asymmetrical angle are demonstrated by numerical simulations, respectively. It is revealed that the shot noise reaches its maximum for the particular situation of half transmission and half reflection and zero shot noise occurs at conductance maxima.

关键词： Noise Reflectance Girdling Spinning Transmissions Electronics Transport Angling

Temperature sensing behavior of Tm^3+:1G4(a),1G4(b) in oxyfluoride glass ceramics containing BaYbxY1-xF5 nanocrystals

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Journal of Rare Earths 2020年第4期38卷 356-361页

作者： rui zhu Ke Zhang Congcong zhu Zhencai Li Qiuhong Min Dacheng Zhou Jianbei Qiu College of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China

Tm3+-doped transparent oxyfluoride glass ceramics containing BaYbxY((1-x))F5 nanocrystals were prepared via high temperature solid phase melting method,of which up-conversion emission is achieved by the Yb3+-mediated energy transfer *** required photon number of Tm3+ions emissions in BaYbxY(1-x)F5 nanocrystals was calculated through the luminescence spectra,revealing the strong dependence of energy transfer mechanism on Yb3+ions ***,based on the fluore scence intensity ratio technology,the effect of different energy transfer mechanism on the temperature sensitivity was investigated by the temperature-dependent luminescence intensity of thermally coupled energy levels of Tm3+:1G4(a),1G4(b).The obtained sensitivity decreases with the increase of Yb3+ions content,which is mainly attributed to the changes in photon absorption process of Tm^3+:1G4(b).

关键词： Tm^3+ BaYbxY(1-x)F5 Glass ceramics Up-conversion luminescence Temperature sensing Rare earths