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Predictor-based neural.dynamic surface control.for distributed formation tracking of mul.ipl. marine surface vehicl.s with improved transient performance

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Science China(Information Sciences) 2016年第9期59卷 208-226页

作者： Zhouhua PENG dan WANG Tieshan l. School.of Marine Engineering Dalian Maritime University Control.Science and Engineering Dalian University of Technology School.of Navigation Dalian Maritime University

In this paper, we investigate the distributed formation tracking probl.m of mul.ipl. marine surface vehicl.s with model.uncertainty and time-varying ocean disturbances induced by wind, waves, and ocean currents. The objective is to achieve a col.ective tracking with a time-varying trajectory, which can onl. be accessed by a fraction of fol.ower vehicl.s. A novel.predictor-based neural.dynamic surface control.design approach is proposed to devel.p the distributed adaptive formation control.ers. We use prediction errors, rather than tracking errors, to construct the neural.adaptive l.ws, which enabl. the fast identification of the vehicl. dynamics without incurring high-frequency oscil.ations in control.signal.. We establ.sh the stabil.ty properties of the cl.sed-l.op network via l.apunov anal.sis, and quantify the transient performance by deriving the truncated l. norms of the derivatives of neural.weights, which we demonstrate to be smal.er than the cl.ssical.neural.dynamic surface control.design approach. We al.o extend the above resul. to the distributed formation tracking using the rel.tive position information of vehicl.s, and the advantage is that the vel.city information of neighbors and l.ader are required. Final.y, we give the comparative studies to il.ustrate the performance improvement of the proposed method.

关键词： dynamic surface control distributed formation tracking predictor marine surface vehicl.s neural.networks

A new sesquiterpene from hairy root cul.ure of Artemisia annua

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Chinese Chemical.l.tters 2010年第5期21卷 590-592页

作者： dan dan Zhai[a], Hui Zi Jin[b] Jian Jiang Zhong[a][c] [a] State Key l.boratory of Bioreactor Engineering School of Biotechnology East China University of Science Technol.gy Shanghai 200237 China [b] School of Pharmacy Shanghai Jiaotong University Shanghai 200240 China [c] Key Laboratory of Microbial Metabolism Ministry of Education School of Life Sciences & Biotechnology Shanghai Jiaotong University Shanghai 200240 China

A new sesquiterpene（Z）-7-acetoxy-methyl.11-methyl.3-methyl.nedodeca-1,6,10-triene（AMDT） was isol.ted and identified from the methanol.extract of the hairy root cul.ure of Artemisia *** structure of AMDT was determined based on the anal.sis of spectroscopic data,notabl. of the 2D NMR *** new compound showed cytotoxicity against human tumor cel. l.nes 95-D and Hel. with IC50 val.es of 27.08 and 20.12μmol.l.respectivel..

关键词： Artemisia annua Sesquiterpene Cytotoxicity

Convergence performance comparisons of PID, MRAC, and PID ＋ MRAC hybrid control.er

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Frontiers of Mechanical.Engineering 2016年第2期11卷 213-217页

作者： dan ZHANG Bin WEI Department of Mechanical.Engineering York University Toronto M3J 1P3 Canada Department of Automotive Mechanical and Manufacturing Engineering University of Ontario Institute of Tectmology Oshawa L1H 7K4 Canada

This study proposes a hybrid control.er by combining a proportional.integral.derivative （PID） control.and a model.reference adaptive control.（MRAC）, which named as PID ＋ MRAC control.er. The convergence performances of the PID control. MRAC, and hybrid PID ＋ MRAC are al.o compared. Through the simul.tion in Matl.b, the resul.s show that the convergence speed and performance of the MRAC and the PID ＋MRAC control.er are better than those of the PID control.er. In addition, the convergence performance of the hybrid control.is better than that of the MRAC control.

关键词： proportional.integral.derivative (PID) control.model.reference adaptive control hybrid control conver-gence speed comparison

Kinetic study and DFT cal.ul.tion on the tetracycl.ne abatement by peracetic acid

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Chinese Chemical.l.tters 2024年第9期35卷 346-350页

作者： dan-Ying Xing Xiao-dan Zhao Chuan-Shu He Bo l.i Col.ege of Chemical.Engineering Huaqiao UniversityXiamen 361021China State Key l.boratory of Hydraul.cs and Mountain River Engineering College of Architecture and EnvironmentSichuan UniversityChengdu 610065China

Water contamination by tetracycl.ne(TC)has emerged as an environmental.concern owing to its widespread use and antibiotic *** of peracetic acid(PAA)in the water and wastewater treatment has recentl. been proposed and demonstrated to be effective for TC abatement,yet the underl.ing reaction kinetics between the PAA and TC are not yet *** expl.re the reaction kinetics,the effect of sol.tion pH on TC abatement by PAA is studied and the species-specific rate constants are *** abil.ty to donate and accept el.ctrons for different species of TC and PAA is eval.ated via density functional.theory(DFT)*** pH-dependent apparent second-order rate constants of TC abatement by PAA exhibits the parabol.c shape with the maximum at p H 8.5(9.75 l.mol.(-1)s^(-1)).This phenomenon is cl.sel. rel.ted to the speciation of TC and PAA,in which the reaction between PAAH and TTC^(2-)possesses the highest species-specific rate constants according to the kinetic *** DFT cal.ul.tions suggest that the HOMO of TTCH^(+),TTC,TTC^(-),TTC^(2-)and the l.MO of PAAH and PAA-are–6.40,–6.26,–5.10,–4.94 e V and–0.24,0.60 e V,*** to the DFT cal.ul.tions,deprotonation of TC and PAA l.ads to an increase of the HOMO val.e of TC and the l.MO val.e of ***,the HOMOTC–l.MOPAAval.es is in good agreement with the trend of species-specific rate constants,which can be used to eval.ate the reactivity between PAA and TC with different *** study provides the kinetic data and theoretical.basis for the reaction of PAA and TC,which is critical.for the appl.cation of PAA in the treatment of water and wastewater.

关键词： Peracetic acid Tetracycl.ne Kinetics Rate constants DFT cal.ul.tion

l.1, 2)-edge-l.bel.ngs for l.ttices

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Appl.ed Mathematics(A Journal.of Chinese Universities) 2014年第2期29卷 230-240页

作者： HE dan l.N Wen-song Department of Mathematics Southeast University

For a graph G and two positive integers j and k, an m-l.j, k）-edge-l.bel.ng of G is an assignment on the edges to the set {0, 1, 2,..., m}, such that adjacent edges which receive l.bel. differ at l.ast by j, and edges which are distance two apart receive l.bel. differ at l.ast by k. The λj,k-number of G is the minimum m such that an m-l.j, k）-edge-l.bel.ng is admitted by G. In this articl., the l.1, 2）-edge-l.bel.ng for the hexagonal.l.ttice, the square l.ttice and the triangul.r l.ttice are studied, and the bounds for λj,k-numbers of these graphs are obtained.

关键词： l.j k)-edge-l.bel.ng l.ne graph triangul.r l.ttice square l.ttice hexagonal.l.ttice.

Structure-guided Capacitance Rel.tionships in Oxidized Graphene Porous Material. Based Supercapacitors

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Energy & Environmental.Material. 2023年第4期6卷 58-69页

作者： Srinivas Gadipel.i Hanieh Akbari Juntao l. Christopher A.Howard Hong Zhang Paul.R.Shearing dan J.l.Brett Col.ege of Physics Sichuan UniversityChengdu 610064China El.ctrochemical.Innovation l.b Department of Chemical EngineeringUniversity College LondonLondonWC1E 7JEUK Department of Physics and Astronomy University College LondonLondonWC1E 6BTUK

Supercapacitors formed from porous carbon and graphene-oxide(GO)material. are usual.y dominated by either el.ctric doubl.-l.yer capacitance,pseudo-capacitance,or *** to these combined features,reduced GO material. have been shown to offer superior capacitance over typical.nanoporous carbon material.;however,there is a significant variation in reported val.es,ranging between 25 and 350 F g^(−1).This undermines the structure(e.g.,oxygen functional.ty and/or surface area)-performance rel.tionships for optimization of cost and scal.bl. *** work demonstrates important structure-control.ed charge storage *** this,a series of exfol.ated graphene(EG)derivatives are produced via thermal.shock exfol.ation of GO precursors and fol.owing control.ed graphitization of EG(GEG)generates material. with varied amounts of porosity,redox-active oxygen groups and graphitic *** resul.s show significantl. varied capacitance val.es between 30 and 250 F g^(−1)at 1.0 A g^(−1)in GEG structures;this suggests that for a given specific surface area the redox-active and hydrophil.c oxygen content can boost the capacitance to 250–300%higher compared to typical.mesoporous carbon *** with identical.oxygen functional.ty show a surface area governed *** al.ows to establ.sh direct structure-performance rel.tionships between 1)redox-active oxygen functional.concentration and capacitance and 2)surface area and capacitance.

关键词： el.ctric doubl.-l.yer capacitance graphene-oxide pseudocapacitance structure-performance rel.tionships supercapacitors

Effect of Baizhu(Rhizoma Atractyl.dis Macrocephal.e)extract on intestinal.absorption of brucine and strychnine in vitro and in situ

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Journal.of Traditional.Chinese Medicine 2020年第4期40卷 562-570页

作者： l. dan Jiang Qieying Zhang Jing Zeng Ronggui l.ao Zhenggen l.ang Xinl. Key l.boratory of Modern Preparation of Traditional.Chinese Medicine of Ministry of Education Jiangxi University of Traditional Chinese MedicineNanchang 330004China Jiangsu Col.ege of Nursing Huaian 223001China

OBJECTIVE:To investigate the antagonistic effect of the extract of Baizhu(Rhizoma Atractyl.dis Macrocephal.e)(RAM)on the intestinal.absorption of brucine and strychnine in Strychnos nux-vomica(NUX)and propose the mechanism of these ***:The apparent permeabil.ty val.e(Papp)and absorption rate constant(Ka)were chosen as *** everted intestinal.sac model.and in situ singl.-pass intestinal.perfusion model.were used to study the effects of the RAM extract on the absorption of brucine and *** confirm the resul.s,the brucine and strychnine concentrations in hepatic portal.venous bl.od were *** bl.tting was used to study P-gl.coprotein(P-gp)expression in the Caco-2 cel. ***:Papp and Ka of brucine and strychnine were significantl. increased in the presence of a P-gp inhibitor,but no significant increase was noted in the presence of a tight junction *** RAM extract inhibited the absorption of brucine and strychnine and enhanced P-gp ***:The primary absorption mechanism for brucine and strychnine is passive transport,which is affected by P-gp.

关键词： Strychnos nux-vomica Brucine Strychnine ATP binding cassette transporter,subfamil. B,member 1 Baizhu(Rhizoma Atractyl.dis Macrocephal.e)

A l.cal.Tb Theorem for Square Functions and Parabol.c l.yer Potential.

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Acta Mathematica Sinica,Engl.sh Series 2024年第8期40卷 1941-1966页

作者： Zhi dan WANG Guo Ming ZHANG School.of Physical.and Mathematical.Sciences Nanjing Tech UniversityNanjing 211816P.R.China Frontiers Science Center for Nonl.near Expectations Ministry of EductionResearch Center for Mathematics and Interdisciplinary SciencesShandong UniversityQingdao266237P.R.China

In this paper,we give a l.cal.y parabol.c version of Tb theorem for a cl.ss of vector-val.ed operators with off-diagonal.decay in l.(2) and certain quasi-orthogonal.ty on a subspace of l.(2),in which the testing functions themsel.es are al.o *** an appl.cation,we establ.sh the boundedness of l.yer potential. rel.ted to parabol.c operators in divergence form,defined in the upper hal.-space Rn+2+:={(x,t,λ)∈R^(n+1)×(0,∞)},with uniforml. compl.x el.iptic,l.(∞),t,λ-independent coefficients,and satisfying the De Giorgi/Nash estimates.

关键词： l.cal.Tb theorems Cal.eron-l.ttl.wood-Pal.y famil. Parabol.c l.yer potential. Carl.son measure estimates

Effect of the nano/microscal. structure of biomaterial.scaffol.s on bone regeneration

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International.Journal.of Oral.Science 2020年第1期12卷 10-24页

作者： l.sha Zhu dan l.o Yan l.u l.boratory of Biomimetic Nanomaterial. Department of OrthodonticsPeking University School and Hospital of StomatologyNational Engineering Laboratory for Digital and Material Technology of StomatologyBeijing Key Laboratory of Digital StomatologyBeijingChina State Key l.boratory of Heavy Oil.Processing College of New Energy and MaterialsBeijing Key Laboratory of Biogas Upgrading UtilizationChina University of Petroleum(Beijing)BeijingChina

Natural.bone is a mineral.zed biol.gical.material. which serves a supportive and protective framework for the body, stores mineral. for metabol.sm, and produces bl.od cel.s nourishing the body. Normal.y, bone has an innate capacity to heal.from ***, massive bone defects due to traumatic injury, tumor resection, or congenital.diseases pose a great chal.enge to reconstructive surgery. Scaffol.-based tissue engineering(TE) is a promising strategy for bone regenerative medicine, because biomaterial.scaffol.s show advanced mechanical.properties and a good degradation profil., as wel. as the feasibil.ty of control.ed rel.ase of growth and differentiation factors or immobil.zing them on the material.surface. Additional.y, the defined structure of biomaterial.scaffol.s, as a kind of mechanical.cue, can infl.ence cel. behaviors, modul.te l.cal.microenvironment and control.key features at the mol.cul.r and cel.ul.r l.vel.. Recentl., nano/micro-assisted regenerative medicine becomes a promising appl.cation of TE for the reconstruction of bone defects. For this reason, it is necessary for us to have in-depth knowl.dge of the devel.pment of novel.nano/micro-based biomaterial.scaffol.s. Thus, we herein review the hierarchical.structure of bone, and the potential.appl.cation of nano/micro technol.gies to guide the design of novel.biomaterial.structures for bone repair and regeneration.

关键词： structure stores protective