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Optimal design and motion control of biomimetic robotic fish

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Science in China(Series F) 2008年第5期51卷 535-549页

作者： yu JunZhi WANG long ZHAO wei TAN Min Key Laboratory of Complex Systems and Intelligence Science Institute of Automation Chinese Academy of Sciences Beijing 100080 China Department of Mechanics and Space Technologies Peking University Beijing 100871 China

This paper is concerned with the design, optimization, and motion control of a radiocontrolled, multi-link, free-swimming biomimetic robotic fish based on an optimized kinematic and dynamic model of fish swimming. The performance of the robotic fish is determined by both the fish＇s morphological characteristics and kinematic parameters. By applying ichthyologic theories of propulsion, a design framework that takes into consideration both mechatronic constraints in physical realization and feasibility of control methods is presented, under which a multiple linked robotic fish that integrates both the carangiform and anguilliform swimming modes can be easily developed. Taking account of both theoretic hydrodynamic issues and practical problems in engineering realization, the optimal link-lengthratios are numerically calculated by an improved constrained cyclic variable method, which are successfully applied to a series of real robotic fishes. The rhythmic movements of swimming are driven by a central pattern generator （CPG） based on nonlinear oscillations, and up-and-down motion by regulating the rotating angle of pectoral fins. The experimental results verify that the presented scheme and method are effective in design and implementation.

关键词： biomimetic robotic fish optimization design mechatronics motion control central pattern generator (CPG)

A mild, configurable, flexible CoNi-LDH（v）/Zn battery based on H-vacancy-induced reversible Zn2+ intercalation

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Journal of Energy Chemistry 2025年第1期100卷 498-508页

作者： Xinyue Cheng Dingsheng Wu Hao Gao Qingqing Wang Pengfei Lv Sam S.Yoon Qufu wei Key Laboratory of Eco-textiles Ministry of Education Jiangnan University School of Mechanical Engineering Korea University

Flexible Zn-based batteries have attracted increasing research interest as essential components of wearable energy storage ***,the advancement of flexible aqueous Zn-based batteries based on Co-Ni layered double hydroxide （CoNi-LDH） as the cathode material is hampered by their poor cycling stability and the corrosiveness of alkaline ***,CoNi-LDH nanosheets enriched with H vacancies (CoNi-LDH（v）) were constructed on a flexible carbon cloth （CC） substrate via electrochemical deposition and *** Zn-based battery comprising CoNi-LDH（v）@CC as the cathode exhibited highly reversible conversion reactions and stable operation in 3 M ZnSO4electrolyte （pH=4）.The battery delivered an excellent specific capacity (225 mA h g-1,0.26 mA h cm-2),acceptable cycling stability（53.9%,900 cycles）,and high discharging *** abundant H vacancies served as active sites for the reversible intercalation of Zn2+and the extravasation of NO3-generated channels and space for Zn2+transport and storage,together enabling an excellent Zn2+storage ***,a sandwich-structured solid-state CoNi-LDH（v）@CC//Zn@CC battery was fabricated and was found to exhibit a noteworthy electrochemical performance and mechanical *** a proof of concept,the unencapsulated battery powered a digital watch under various deformation conditions and operated stably for 80 ***,the flexible battery displayed outstanding customizability,maintaining an open-circuit voltage of 1.42 V even after being cut *** proposed engineering strategy contributes to the realization of textiles with truly wearable energy-storage devices.

关键词： CoNi/Zn battery H vacancies Mild aqueous electrolyte Tailorable battery Wearable energy storage device

Effect of electrically stimulating acupoint, Zusanli(ST 36), on patient’s recovery after laparoscopic colorectal cancer resection: a randomized controlled trial

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Journal of Traditional Chinese Medicine 2019年第3期39卷 433-439页

作者： Huang wei yu Tingyu long Wenfei Xiao Jianbin Zhao Gaofeng Department of Anesthesiology Guangdong Provincial Hospital of Chinese Medicine Guangzhou 510000 China Second Clinical Medical College Guangzhou University of Chinese Medicine Guangzhou 510000 China

OBJECTIVE:To investigate the effect of transcutaneous electrical acupoint stimulation (TEAS) on enhanced recovery after surgery (ERAS) in laparoscopic colorectal cancer resection and its clinical ***:Sixty-four patients undergoing laparoscopic colorectal resection were randomly divided into two groups,the control group (group A) and the TEAS group (group B).Patients in the TEAS group received electroacupuncture stimulation of bilateral Zusanli (ST 36) at 30 min before anesthesia to the end of *** patients in the control group were not given the *** anesthesia management of the two groups were performed according to the ERAS guidelines,and postoperative patient-controlled intravenous analgesia (PCIA) was *** amount of remifentanil used in the two groups was observed and recorded,and the visual analogue scale (VAS) of the 4,12,24 and 48 h after surgery in the two groups was ***,postoperative anal exhaust time,postoperative feeding time,postoperative first ambulation time and postoperative hospital stay length were compared between the two ***:Compared with group A,the VAS score of group B decreased significantly at 48 h after operation (P 0.05).CONCLUSION:TEAS can promote the recovery of postoperative gastrointestinal function and reduce the pain intensity 48 h after surgery,thus satisfying the need of early postoperative analgesia.

关键词： Colorectal neoplasms Laparoscopes Transcutaneous electric nerve stimulation Recovery of function Randomized controlled trial

High performance white LED driver with single-wire serial-pulse digital dimming

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The Journal of China Universities of Posts and Telecommunications 2009年第1期16卷 95-99,110页

作者： yu Kai ZOU Xue-cheng long Shuang WANG wei-xu Department of Electronic Science and Technology Huazhong University of Science and Technology Wuhan 430074 China

A high performance white light emitter diode （LED） driver based on boost converter with novel single-wire serial-pulse digital dimming （SWSP） is proposed. The driver uses external serial programmed pulses and internal clock to simplify brightness control By embedding a 5-bit digital analog converter （DAC） into the driver, wide dimming range is achieved. Moreover, a new dynamic slope compensation circuit is presented and other key circuits of the driver are optimized to get higher efficiency and fast transition response. A practical circuit is implemented with 0.6 um bipolar complementary-metal-oxide-semiconductor double-diffused-metal-oxide-semiconductor （BCD） technology. The simulation results show that the driver can provide both wide output current from 1.3 mA to 42 mA with 32-level digital dimming and higher efficiency up to 83% while it works at 1 MHz switching frequency with the input voltage variation from 2.7 V to 5.5 V.

关键词： White LED driver boost converter single-wire serial-pulse digital dimming dynamic slope compensation

A new power generation method utilizing a low grade heat source

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2012年第2期13卷 140-145页

作者： wei-feng WU Xin-ping long Xiao-ling yu Quan-ke FENG School of Energy and Power Engineering Xi ＇an Jiaotong University Xi ＇an 710049 China School of Power and Mechanical Engineering Wuhan University Wuhan 430072 China

Energy crisis make the effective use of low grade energy more and more urgent. It is still a worldwide difficult conundrum. To efficiently recover low grade heat, this paper deals with a theoretical analysis of a new power generation method driven by a low grade heat source. When the temperature of the low grade heat source exceeds the saturated temperature, it can heat the liquid into steam. If the steam is sealed and cooled in a container, it will lead to a negative pressure condition. The proposed power generation method utilizes the negative pressure condition in the sealed container, called as a condensator. When the condensator is connected to a liquid pool, the liquid will be pumped into it by the negative pressure condition. After the conden- sator is filled by liquid, the liquid flows back into the pool and drives the turbine to generate electricity. According to our analysis, for water, the head pressure of water pumped into the condensator could reach 9.5 m when the temperature of water in the pool is 25 ℃, and the steam temperature is 105 ℃. Theoretical thermal efficiency of this power generation system could reach 3.2% to 5.8% varying with the altitude of the condensator to the water level, ignoring steam leakage loss.

关键词： Low grade heat Power generation Condensation Energ-v storage Renewable energy

A regularization algorithm for estimating the multimodal size distribution of nanoparticles from multiangle dynamic light scattering

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Particuology 2018年第6期16卷 30-39页

作者： Lei Li Kecheng Yang wei Li Kai Li long yu Min Xia School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074China Wuhan University Scientific Journals Press Wuhan 430072China

The multiangle dynamic light scattering (MDLS)technique provides more robust,reproducible,and accu- rate particle size distributions (PSDs)than single-angle dynamic light ***,in MDLS,the determination of peak locations is difficult but significant,particularly for multimodal *** this paper,a self-adaptive algorithm,the iterative recursion nonnegative Tikhonov-Phillips-Twomey (IRNNT-PT)algorithm,is proposed for the estimation of the PSD from MDLS *** algorithm optimizes the weighting coefficients,distinguishes features of PSDs and chooses the optimal inversion method from two regularization algorithms *** simulations and experimental results for unimodal and multimodal distributions are presented to demonstrate both the validity and noise immunity of the IRNNT-PT algorithm,and demonstrate that the proposed algorithm can be well applied to reconstruct PSDs from MDLS measurements.

关键词： Dynamic light scattering Particle size distribution Inverse scattering Mie theory Scattering measurements

Technology development for rare earth cleaner hydrometallurgy in China

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Rare Metals 2015年第4期34卷 215-222页

作者： Xiao-wei Huang Zhi-Qi long Liang-Shi Wang Zong-yu Feng National Engineering Research Center for Rare Earth Materials General Research Institute for Nonferrous Metals Grirem Advanced Materials Co. Ltd.

China is the global leader in rare earth （RE） production using hydrometallurgical processes. Advantageous extraction techniques of rare earths from Baotou mixed rare earth minerals, bastnaesite, and ion-adsorption clays of rare earth deposits have been developed in China. The separation and purification technologies have also achieved rapid development. The industrial application processes for rare earth hydrometallurgy were summarized in the present paper. With the large demands and rapid development of rare earths, the issues of resources and environment are more prominent. This review gives an overview of the main processes that were developed in the past toward greener hydrometallurgy of rare earths in China. Based on the development of the rare earth industry, comprehensive utilization and cleaner production should still be focused on in the future, to support the sustainable development.

关键词： Rare earths Cleaner production Separation and purification Hydrometallurgy

Experiment and Simulation for Rolling of Diamond–Cu Composites

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Acta Metallurgica Sinica(English Letters) 2017年第8期30卷 791-800页

作者： yun-long Wang Kai-Kun Wang yu-wei Wang Guang-Chen Li School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China Department of Engineering University of LeicesterUniversity Road Leicester LE1 7RH UK Tianjin Xiangtong Electronic Company LTD Tianjin 301800 China

We demonstrate an innovative preparation approach of diamond/Cu composites by powder-in-tube technique and rolling. A small copper tube was loaded with Ti- and Cu-coated diamond particles, mad then the diamond particles were combined with Cu matrix by composite rolling. The morphology and element distribution of the interface between diamond and Cu were determined by scanning electron microscopy and energy-dispersive spectrometer. Finite element method （FEM） simulation was used to analyze the rolling process associated with experiment by DEFORM-3D. The final experimental results showed that homogeneous distribution of diamond particles could be observed in the center layer of the composites. According to the contrast experiments, the sample, whose diamond particle size is 0.12-0.15 mm and thickness of pre-rolling is 1.2 mm, showed relatively complete morphologies and homogeneous distribution. Experimental results indicated a poor efficacy of excessive rolling reduction. The thermal conductivity of the composites is about 453 W （m K）-1 by theoretical calculation. For FEM simulation, roiling strain and temperature field of the composites were simulated by DEFORM-3D. Simulation results were interpreted, and numerical results verified the reliability of the model. The simulation predicted that the local area of large strain, indicative of the strain along the thickness direction, could be intensified by adding diamond particles.

关键词： Diamond/Cu composites Powder-in-tube technique (PIT) Rolling Finite element method(FEM) simulation

Data Bucket-Based Fragment Management for Solid State Drive Storage System

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Journal of Electronic Science and Technology 2020年第4期18卷 330-340页

作者： wei Jiang Jun-long Wang Jin-yu Zhan Jing-Huan yu Hai-Bo Hu School of Information and Software Engineering University of Electronic Science and Technology of ChinaChengdu 610054 Computer Science Department City University of Hong KongHong Kong 999077

The current storage mechanism considered little in data’s keeping *** can produce fragments of various sizes among data *** some cases,these fragments may be serious and harm system *** this paper,we manage to modify the current storage *** introduce an extra storage unit called data bucket into the classical data manage ***,we modify the data manage mechanism to improve our *** keeping data according to their visited information,both the number of fragments and the fragment size are greatly *** different data features and storage device conditions,we also improve the solid state drive(SSD)lifetime by keeping data into different *** show that our designs have a positive influence on the SSD storage density and actual service time.

关键词： Data structure erasing time fragment solid state driver(SSD)