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Clean Energy 2022年第3期6卷 496-502页

作者： liMing Wei kaikai li School of Electrical and Computer Engineering Jilin Jianzhu UniversityChangchunJilin130118China

Solar energy has attracted a lot of attention because it is clean and has no ***,due to the partially shaded condition,the photovoltaic array cannot work uniformly at the maximum power point,resulting in a large power *** improve this problem,the research of the maximum power point tracking(MPPT)algorithm is discussed by *** this paper,an improved particle swarm optimization(PSO)algorithm is proposed to achieve the goal of MPPT,which uses Newton interpolation-assisted conventional *** tracking to the maximum power point,the Newton interpolation method is used to calculate the maximum power point,reduce the number of iterations of the conventional PSO algorithm and reduce the steady-state *** simulation is carried out in MATLAB^(■)/Simulink^(■)and compared with conventional *** results show that the improved PSO has better tracking ac-curacy and speed than the conventional algorithm,and the initial tracking speed is increased by>30%.

关键词： photovoltaic array maximum power point tracking particle swarm optimization algorithm Newton interpolation method

Superhydrophobic Purple Orchid Leaves:Variation in Surface Morphology During the Vegetation Stages Leading to Diversity in Wettability

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Journal of Bionic Engineering 2023年第6期20卷 2774-2785页

作者： Longsheng Lu Guoxiang Jiang kaikai li Yingxi Xie Jiao Gao School of Mechanical&Automotive Engineering South China University of TechnologyGuangzhou510641China Shien-Ming Wu School of Intelligent Engineering South China University of TechnologyGuangzhou511442China

Learning hydrophobic phenomena from nature is always a promising approach to design the superhydrophobic *** orchid leaf which processes superhydrophobicity is an ideal plant model,and through mimicking its structure,the surface with excellent hydrophobicity is able to be ***,the unclear of the diversity in wettability during the different vegetation stages and the absence of its relation to the surface morphology limits the further enhancement of the inspired ***,we analyze the wettability difference as the leaf grows from tender to mature and then to *** with the variation of surface morphology and chemical composition,the well-developed micro-scale basic unit bumps with dense nano-scale waxy layer on the surface are proven to be responsible for the best hydrophobicity of the mature *** presence of the undeveloped or damaged micro-nano hierarchical structure reduces the formation of air pockets at the interface,leading to the decrease of the wettability for leaves at other ***,by fabricating artificial leaves,the nano-waxy layer is proved to be more effective than that of the micro-bumps on the surface *** results of study are of a great significance for guiding the design and fabrication of plant-inspired bionic superhydrophobic surface.

关键词： Superhydrophobicity Surface morphology Micro-nano hierarchical structure Purple orchid leaf Bionic

Parallel Implementation of the Non-Overlapping Template Matching Test Using CUDA

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China Communications 2020年第8期17卷 234-241页

作者： kaikai li Jianguo Zhang Pu li Anbang Wang Yuncai Wang Key Lab of Advanced Transducers and Intelligent Control System(Taiyuan University of Technology) Ministry of Education&Shanxi ProvinceTaiyuan 030024China College of Information Engineering Guangdong University of TechnologyGuangzhou 510006China Guangdong Provincial Key Laboratory of Photonics Information Technology Guangdong University of TechnologyGuangzhou 510006China

NIST(National Institute of Standards and Technology) statistical test recognized as the most authoritative is widely used in verifying the randomness of binary sequences. The Non-overlapping Template Matching Test as the 7 th test of the NIST Test Suit is remarkably time consuming and the slow performance is one of the major hurdles in the testing process. In this paper, we present an efficient bit-parallel matching algorithm and segmented scan-based strategy for execution on Graphics Processing Unit(GPU) using NVIDIA Compute Unified Device Architecture(CUDA). Experimental results show the significant performance improvement of the parallelized Non-overlapping Template Matching Test, the running speed is 483 times faster than the original NIST implementation without attenuating the test result accuracy.

关键词： random numbers CUDA non-overlapping template matching test parallel implementation NIST test

Discovery of SPICE and carbon isotope stratigraphic correlation of the Cambrian Furongian Series in Tarim Craton, NW China

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Science China Earth Sciences 2020年第9期63卷 1330-1338页

作者： Yongquan CHEN Yanqiu ZHANG Yasheng WU Peng ZHOU kaikai li Xiaoxue WANG Petroleum Exploration and Development Institute Tarim Oil CompanyPetrochinaKorla 841000China Key Laboratory of Petroleum Resources Research Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China Innovation Academy for Earth Science Chinese Academy of SciencesBeijing 100029China University of Chinese Academy of Sciences Beijing 100049China School of Energy and Resources China University of Geosciences(Beijing)Beijing 100083China Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Enrichment Mechanism Ministry of EducationBeijing 100083China

The Furongian Series of the Cambrian in the Tarim Craton(NW China)is mainly composed of crystalline dolostones,and is an important target for oil and gas *** chronostratigraphic framework of the Furongian Series in the Tarim Craton has not yet been established due to the scarcity of fossils and the absence of the Steptoean Positive Carbon Isotope Excursion(SPICE),which is the primary global carbon isotope excursion of the Furongian *** this study,the SPICE was discovered by examining the carbon isotopes of the representative drilling wells in the West Platform and East Basin.A positive carbon isotope anomaly withδ13C values ranging from 1.5‰to 1.9‰(PDB),were found in the middle of the Xiaqiulitag Formation of the three drilling wells in the West Platform,and a positive excursion withδ13C values up to 4.0‰(PDB),which is correlated with the SPICE,was found in the lower limestone of the Tuershaketag Formation in the East *** on the carbon isotopic data and chemostratigraphic correlation,the chronostratigraphic framework of the Furongian Series across different facies in the Tarim Craton is preliminarily *** basal boundary of the Furongian Series was preliminarily defined by the occurrence of the *** positive anomaly ofδ13C was observed at the base of the Penglaiba Formation of the three boreholes in the West Platform and the top of the Tuershaketag Formation of Tadong-2 *** propose that the positive anomaly of the carbon isotope above the weak negative anomaly at the base of the Penglaiba Formation and the top of the Tuershaketag Formation can be used to define the Cambrian-Ordovician boundary in the Tarim Craton.

关键词： Tarim craton Cambrian Furongian series SPICE Carbon isotope stratigraphy

Preparing Ca-P coating on biodegradable magnesium alloy by hydrothermal method:In vitro degradation behavior

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Chinese Science Bulletin 2012年第18期57卷 2319-2322页

作者： li kaikai Wang Bing Yan Biao Lu Wei School of Material Science and Engineering Tongji UniversityShanghai 201804China Shanghai Key Laboratory of D&A for Metal-Functional Materials Tongji UniversityShanghai 201804China

Magnesium alloys are potentially attractive biodegradable ***,their rapid corrosion rate limits their biomedical *** slow down the rate of biodegradation,a protective calcium-phosphate coating was formed on a magnesium alloy substrate by a hydrothermal *** electron microscope results showed that the coating consisted of two layers with different crystalline *** loose outer layer showed a prism-like crystal structure,while the compact inner layer is a dense ultra-fine regular di-pyramid-like structure with an average grain dimension of ～200 *** compositions of the inner layer and outer layer were calcium-deficient hydroxyapatite (Ca-def HA) and dicalcium phosphate (DCPa),*** coating adhered well to the substrate with a thickness of about 15 *** in Hank's solution indicated that the coating could significantly improve the degradation properties of magnesium *** pH of the solution containing the coated samples increased much more slowly than the untreated *** 8 d immersion,the uncoated sample had corroded seriously while the coated sample was much less *** Ca/P atom ratio in both the layers of the coating increased and the coating was still protecting the *** two layers of the coating corroded differently because of differences in *** outer layer was more severely attacked and many holes were formed on the surface,the inner layer suffered less *** addition,a growth of precipitate on the inner layer was observed,indicating that surface bioactivity was improved by the ***,magnesium alloys coated with a Ca-P coating prepared by a hydrothermal method are promising candidate biodegradable biomaterials,and further investigation of in vivo degradation behavior is suggested.

关键词：降解行为镁合金水热法生物可降解镀层可生物降解材料涂层保护体外

Electrochemical behaviour and cytocompatibility of nano-fluoridated apatite coating on biodegradable magnesium alloy by simple chemical conversion

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Science China(Technological Sciences) 2013年第1期56卷 80-83页

作者： li kaikai WANG Bing CHAI Jing YAN Biao LU Wei School of Materials Science and Engineering Tongji University Shanghai Key Laboratories of D&A for Metal-Functional Materials Tongji University

Magnesium and its alloys have attracted great attention as biocompatible and degradable biomaterials recent *** their corrosion rate has been proved to be too high,which limits their biomedical application *** order to improve the corrosion resistance,nano-fluoridated apatite(FA) coating was prepared on ZK60 magnesium alloy by a simple chemical conversion *** FA coating showed a needle-like *** polarization curves and EIS plots indicated that the FA coating improved the corrosion potential by 125 mV and doubled the polarization resistance of the magnesium alloy,meanwhile decreasing the corrosion current by two orders of magnitude of the substrate in simulated body *** MTT assay indicated good cytocompatibility of L-929 cells with the fluoridated apatite coated magnesium alloy.

关键词： magnesium alloy corrosion resistance cytocompatibility polarization curves EIS

Fast and stable K-ion storage enabled by synergistic interlayer and pore-structure engineering

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Nano Research 2021年第12期14卷 4502-4511页

作者： Deping li Qing Sun Yamin Zhang Xinyue Dai Fengjun Ji kaikai li Qunhui Yuan Xingjun liu lijie Ci State Key Laboratory of Advanced Welding and Joining School of Materials Science and EngineeringHarbin Institute of Technology(shenzhen)Shenzhen518055China Research Center for Carbon Nanomaterials Key Laboratory for Liquid-Solid Structural Evolution&Processing of Materials(Ministry of Education)School of Materials Science and EngineeringShandong UniversityJinan250061China

Carbon-based material has been regarded as one of the most promising electrode materials for potassium-ion batteries(PIBs).However,the battery performance based on reported porous carbon electrodes is still unsatisfactory,while the in-depth K-ion storage mechanism remains relatively ***,we propose a facile“in situ self-template bubbling”method for synthesizing interlayer-tuned hierarchically porous carbon with different metallic ions,which delivers superior K-ion storage performance,especially the high reversible capacity(360.6 mAh·g^(−1)@0.05 A·g^(−1)),excellent rate capability(158.6 mAh·g^(−1)@10.0 A·g^(−1))and ultralong high-rate cycling stability(82.8%capacity retention after 2,000 cycles at 5.0 A·g^(−1)).Theoretical simulation reveals the correlations between interlayer distance and K-ion diffusion ***,deliberately designed consecutive cyclic voltammetry(CV)measurements,ex situ Raman tests,galvanostatic intermittent titration technique(GITT)method decipher the origin of the excellent rate performance by disentangling the synergistic effect of interlayer and pore-structure *** the facile preparation strategy,superior electrochemical performance and insightful mechanism investigations,this work may deepen the fundamental understandings of carbon-based PIBs and related energy storage devices like sodium-ion batteries,aluminum-ion batteries,electrochemical capacitors,and dual-ion batteries.

关键词： potassium-ion batteries synergistic interlayer and pore-structure engineering theoretical calculations carbonaceous electrode ex situ Raman technique

Chemical Strain of Graphite-Based Anode during lithiation and Delithiation at Various Temperatures

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Research 2021年第1期2021卷 1255-1265页

作者： Zeyu Xu Xiuling Shi Xiaoqiang Zhuang Zihan Wang Sheng Sun kaikai li Tong-Yi Zhang Materials Genome Institute Shanghai University333 Nanchen RoadShanghai 200444China School of Materials Science and Engineering Harbin Institute of TechnologyShenzhenChina

Electrochemical lithiation/delithiation of electrodes induces chemical strain cycling that causes fatigue and other harmful influences on lithium-ion *** this work,a homemade in situ measurement device was used to characterize simultaneously chemical strain and nominal state of charge,especially residual chemical strain and residual nominal state of charge,in graphite-based electrodes at various *** measurements indicate that raising the testing temperature from 20℃ to 60℃ decreases the chemical strain at the same nominal state of charge during cycling,while residual chemical strain and residual nominal state of charge increase with the increase of ***,a novel electrochemicalmechanical model is developed to evaluate quantitatively the chemical strain caused by a solid electrolyte interface(SEI)and the partial molar volume of li in the SEI at different *** present study will definitely stimulate future investigations on the electro-chemo-mechanics coupling behaviors in lithium-ion batteries.

关键词： nominal cycling lithium

Comparison of Single-Step and Two-Step EBL T-Gates Fabrication Techniques for In P-Based HEMT

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Chinese Journal of Electronics 2016年第2期25卷 199-202页

作者： ZHONG Yinghui ZANG Huaping SUN Shuxiang WANG Haili li kaikai li Xinjian DING Peng JIN Zhi School of Physics and Engineering Zhengzhou University Institute of Microelectronics Chinese Academy of Sciences

T-Gate fabrication processes for In P-based High electron mobility transistors(HEMTs) are described using PMMA/Al/UVIII. The single-step and two-step Electron beam lithography(EBL) methods are proposed contrastively without dielectric support layer. The optimal gate-foot length is 196 nm for 50 nm geometry path by single-step EBL technique. Since the gate-foot and gate-head are defined independently, the two-step EBL process minimizes forward scattering and enables smaller gate-foot length, which improves to be 141 nm for 50 nm geometry path and also 88 nm for 30 nm geometry *** EBL methods have been incorporated into In Pbased HEMTs fabrication. With the gate-foot length decreases from 196 nm to 141 nm, the current-gain cutoff frequency(fT) is improved from 125 GHz to 164 GHz, and also the maximum oscillation frequency(fmax) increases from305 GHz to 375 GHz.

关键词： T-Gate HEMTs EBL technique Two-step EBL technique Polymethylmethacrylate(PMMA)

Cutting performance of surgical electrodes by constructing bionic microstriped structures

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Frontiers of Mechanical Engineering 2023年第1期18卷 163-178页

作者： kaikai li Longsheng LU Huaping CHEN Guoxiang JIANG Huanwen DING Min YU Yingxi XIE School of Mechanical&Automotive Engineering South China University of TechnologyGuangzhou 510641China Testing and Technology Center for Industrial Products of Shenzhen Customs District Shenzhen 518067China South China University of Technology School of Medicine Guangzhou 510006China Department of Orthopaedics Guangzhou First People’s HospitalGuangzhou 510180China Department of General Surgery Guangdong Provincial People’s HospitalGuangdong Academy of Medical SciencesGuangzhou 510080China

Surgical electrodes rely on thermal effect of high-frequency current and are a widely used medical tool for cutting and coagulating biological ***,tissue adhesion on the electrode surface and thermal injury to adjacent tissue are serious problems in surgery that can affect cutting performance.A bionic microstriped structure mimicking a banana leaf was constructed on the electrode via nanosecond laser surface texturing,followed by silanization treatment,to enhance *** effect of initial,simple grid-textured,and bionic electrodes with different wettabilities on tissue adhesion and thermal injury were investigated using horizontal and vertical cutting *** showed that the bionic electrode with high lyophobicity can effectively reduce tissue adhesion mass and thermal injury depth/area compared with the initial *** formation mechanism of adhered tissue was discussed in terms of morphological features,and the potential mechanism for antiadhesion and heat dissipation of the bionic electrode was ***,we evaluated the influence of groove depth on tissue adhesion and thermal injury and then verified the antiadhesion stability of the bionic *** study demonstrates a promising approach for improving the cutting performance of surgical electrodes.

关键词： surgical electrodes tissue adhesion thermal injury bionic structures cutting performance medical tools