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SHARING AND PLANNING OF DISTRIBUTED EQUIPMENT FOR NETWORKED MANUFACTURING

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Chinese Journal of Mechanical Engineering 2007年第1期20卷 73-76页

作者： cao Le LIU fei School of Mechanical Engineenng Chongqing University Chongqing 400030 China

Efficient utilization of the equipment distributed in different enterprises and optimal allocation of these resources is an important concern for networked manufacturing. The third party based equipment sharing approach is put forward to optimize the utilization of distributed equipment for networked manufacturing; Taking advantage of the shared equipment offered by equipment providers by means of lease agreement, the third party carries out production by establishing networked virtual factory. Operational mechanism of the third party based equipment sharing is discussed, and characteristics of this approach in achieving resource allocation are analyzed. Shared equipment planning is formulated as an optimization problem with the objective of maximizing profits for equipment coordinator, a mathematical model for shared equipment planning is developed. Finally a case study is discussed to show the effectiveness of the planning model.

关键词： Networked manufacturing Equipment sharing Equipment planning

Lithiophilic interface guided transient infiltration of molten lithium for stable 3D composite lithium anodes

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Nano Research 2023年第6期16卷 8297-8303页

作者： Lan-Xing Li Yun-Nuo Li fei-fei cao Huan Ye College of Science Huazhong Agricultural UniversityWuhan 430070China

Fabricating three-dimensional(3D)composite lithium anodes via thermal infusion effectively addresses uncontrollable Li deposition and large volume ***,potential risks due to the long wetting time and high melting point remain a critical yet unconsidered ***,we report a stable 3D composite Li anode by infusing molten Li into a 3D scaffold within 3 s at 220℃.The key-enabling technique is the growth of a lithiophilic Mg-Al double oxide(LDO)nanosheet array layer on the *** in-situ formed lithiophilic alloy,combined with the capillary forces from the nanosheet arrays,enabled the transient infiltration of molten *** addition,the formed high ionic-conductivity Li phase can help construct a robust solid electrolyte interphase(SEI),stabilize the Li anode/electrolyte interface,and guide uniform Li *** 3D composite anode exhibited a long cycling life of 1,000 h under a current density of 1 mA·cm^(−2)and over 1,600 h under a current density of 2 mA·cm^(−2)with a high areal capacity of 4 mAh·cm^(−2)in Li/Li symmetric *** 3D composite anodes paired with high areal capacity LiFePO_(4)(LFP)and S cathodes demonstrate its practical application feasibility.

关键词： lithium metal battery composite Li anode interfacial layer thermal infusion long cycling life

Catalytic asymmetric synthesis of sulfur-containing atropisomers by C-S bond formations

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Science China Chemistry 2023年第12期66卷 3331-3346页

作者： Ren-fei cao Zhi-Min Chen School of Chemistry and Chemical Engineering Shanghai Key Laboratory for Molecular Engineering of Chiral DrugsShanghai Jiao Tong UniversityShanghai 200240China

Chiral organosulfur compounds are not only widely distributed in bioactive natural products and pharmaceuticals,but also play a significant role in chiral ligands/*** the history of synthetic organic chemistry,chemists have been absorbed in the construction of centrally chiral organosulfur ***,there are relatively few reports on installing sulfur functional groups into axially chiral *** is one of the fundamental phenomena in nature,which ubiquitously exists in natural *** more than a century of development,atropisomers have been designed and extensively applied to pharmaceuticals,functional materials and chiral ligands/*** to the importance of chiral sulfurcontaining atropisomers,there is an increasing demand for enantioselective synthesis of ***,a diversity of approaches by C-S bond formations have been established for the construction of enantioenriched sulfur-containing atropisomers,however,there is no comprehensive review to summarize this great *** this mini-review,we summarize recent progress in catalytic asymmetric synthesis of sulfur-containing atropisomers by C-S bond formations,which includes sulfur nucleophilic reactions,sulfur electrophilic reactions and sulfur radical ***,the reaction mechanisms are also *** hope that this mini-review will enable more researchers to further explore this field.

关键词： atropisomers asymmetric catalysis C-S bond formations chiral organosulfur compounds

A 4H-SiC trench MOSFET structure with wrap N-type pillar for low oxide field and enhanced switching performance

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Chinese Physics B 2022年第7期31卷 629-636页

作者： Pei Shen Ying Wang fei cao The Key Laboratory of RF Circuits and Systems Ministry of EducationHangzhou Dianzi UniversityHangzhou 310018China The School of Mechanical and Electronic Engineering Pingxiang UniversityPingxiang 337055China

An optimized silicon carbide(SiC)trench metal-oxide-semiconductor field-effect transistor(MOSFET)structure with side-wall p-type pillar(p-pillar)and wrap n-type pillar(n-pillar)in the n-drain was investigated by utilizing Silvaco TCAD *** optimized structure mainly includes a p+buried region,a light n-type current spreading layer(CSL),a p-type pillar region,and a wrapping n-type pillar region at the right and bottom of the *** improved structure is named as *** side-wall p-pillar region could better relieve the high electric field around the p+shielding region and the gate oxide in the off-state *** wrapping n-pillar region and CSL can also effectively reduce the specific on-resistance(Ron,sp).As a result,the SNPPT-MOS structure exhibits that the figure of merit(Fo M)related to the breakdown voltage(V_(BR))and Ron,sp(V_(BR)^2R_(on,sp))of the SNPPT-MOS is improved by 44.5%,in comparison to that of the conventional trench gate SJ MOSFET(full-SJ-MOS).In addition,the SNPPT-MOS structure achieves a much fasterwitching speed than the full-SJ-MOS,and the result indicates an appreciable reduction in the switching energy loss.

关键词： 4H-silicon carbide(4H-SiC)trench gate MOSFET breakdown voltage(V_(BR)) specific onresistance(R_(on sp)) switching energy loss super-junction

The construction and approximation of feedforward neural network with hyperbolic tangent function

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Applied Mathematics(A Journal of Chinese Universities) 2015年第2期30卷 151-162页

作者： CHEN Zhi-xiang cao fei-long Department of Mathematics Shaoxing University Department of Mathematics China Jiliang University

In this paper, we discuss some analytic properties of hyperbolic tangent function and estimate some approximation errors of neural network operators with the hyperbolic tan- gent activation function. Firstly, an equation of partitions of unity for the hyperbolic tangent function is given. Then, two kinds of quasi-interpolation type neural network operators are con- structed to approximate univariate and bivariate functions, respectively. Also, the errors of the approximation are estimated by means of the modulus of continuity of function. Moreover, for approximated functions with high order derivatives, the approximation errors of the constructed operators are estimated.

关键词： Hyperbolic tangent function neural networks approximation modulus of continuity

Approximating and learning by Lipschitz kernel on the sphere

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Applied Mathematics(A Journal of Chinese Universities) 2014年第2期29卷 151-161页

作者： cao fei-long WANG Chang-miao Department of Mathematics China Jiliang University

This paper investigates some approximation properties and learning rates of Lipschitz kernel on the sphere. A perfect convergence rate on the shifts of Lipschitz kernel on the sphere, which is faster than O（n-1/2）, is obtained, where n is the number of parameters needed in the approximation. By means of the approximation, a learning rate of regularized least square algorithm with the Lipschitz kernel on the sphere is also deduced.

关键词： Approximation learning rate Lipschitz kernel sphere.

Strategies for improving the storage performance of silicon-based anodes in lithium-ion batteries

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Nano Research 2019年第8期12卷 1739-1749页

作者： Wei Tao Ping Wang Ya You Kyusung Park cao-Yu Wang Yong-Ke Li fei-fei cao Sen Xin College of Science Huazhong Agricultural UniversityWuhan 430070China Department of Mechanical Engineering The University of Texas at Austin AustinTX 78712USA

Silicon has attracted much attention as a promising anode material for lithium-ion batteries (LIBs) due to its high theoretical capacity and rich resource abundance. However, the practical battery use of Si is challenged by its low conductivity and drastic volume variation during the Li uptake/release process. Tremendous efforts have been made on shrinking the particle size of Si into nanoscale so that the volume variation could be accommodated. However, the bare nano-Si material would still pulverize upon (de)lithiation. Moreover, it shows an excessive surface area to invite unlimited growth of solid electrolyte interface that hinders the transportation of charge carriers, and an increased interparticle resistance. As a result, the Si nanoparticles gradually lose their electrical contact during the cycling process, which accounts for poor thermodynamic stability and sluggish kinetics of the anode reaction versus Li. To address these problems and improve the Li storage performance of nano-Si anode, proper structural design should be applied on the Si anode. In this perspective, we will briefly review some strategies for improving the electrochemistry versus Li of nano-Si materials and their derivatives, and show opinions on the optimal design of nanostructured Si anode for advanced LIBs.

关键词： silicon anode lithium-ion battery silicon/carbon composites silicon/non-carbon composites silicon oxide

Composite electrolytes with efficient Li^(+)transport across ceramic/polymer interface

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Science China Chemistry 2023年第7期66卷 1879-1880页

作者： Jiayao Chen Xinyuan Shan Peng-fei cao State Key Lab of Organic-Inorganic Composites Beijing University of Chemical TechnologyBeijing 100029China Institute of New Energy Material Chemistry School of Materials Science and EngineeringNankai UniversityTianjin 300350China

Over the past decades,solid electrolytes have re-emerged as promising candidates which replace flammable liquid electrolytes for a safe,energy-dense,and reversible storage of electrochemical energy in batteries[1].However,as the main distinct families of solid electrolytes,both polymer and ceramic electrolytes have their individual disadvantages in ionic conductivity,mechanical robustness,and interfacial resistance.

关键词： ceramic polymer interface

Separation of tungsten and molybdenum with solvent extraction using functionalized ionic liquid tricaprylmethylammonium bis(2,4,4-trimethylpentyl)phosphinate

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International Journal of Minerals,Metallurgy and Materials 2021年第11期28卷 1769-1776页

作者： fei cao Wei Wang De-zhou Wei Wen-gang Liu School of Resource and Civil Engineering Northeastern UniversityShenyang 110819China Zhengzhou Institute of Multipurpose Utilization of Mineral Resources CAGSZhengzhou 450006China Key Laboratory for Polymetallic Ores’Evaluation and Utilization MNRZhengzhou 450006China

Functionalized ionic liquids(FILs)as extractants were employed for the separation of tungsten and molybdenum from a sulfate solution for the first *** effects of initial pH,extractant concentration,metal concentrations in the feed were comprehensively *** results showed that tricaprylmethylammonium bis(2,4,4-trimethylpentyl)phosphinate([A336][Cyanex272])could selectively extract W over Mo at an initial pH value of 5.5;the best separation factorβ_(W/Mo) of 25.61 was obtained for a solution with low metal concentrations(WO3:2.49 g/L,Mo:1.04 g/L).The[A336][Cyanex272]system performed effectively for solutions of different W/Mo molar ratios and different metal ion concentrations in the *** chemical reaction between[A336][Cyanex272]and W followed the ion association mechanism,which was further proved by the Fourier-transform infrared(FTIR)spectra of loaded[A336][Cyanex272]and the free *** stripping experiments indicated that 95.48%W and 100.00%Mo were stripped using a 0.20 mol/L sodium hydroxide ***,the selective extractions of W and Mo from two synthetic solutions of different high metal concentrations were obtained;the separation factorβW/Mo reached 23.24 and 17.59 for the first and second solutions,*** results suggest the feasibility of[A336][Cyanex272]as an extractant for the separation of tungsten and molybdenum.

关键词： tungsten molybdenum ionic liquid separation solvent extraction