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Comparative Study on Different Met.ods for Predict.on of thermal Insulat.on Performance of thermal Barrier Coating Used on turbine Blades

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Journal of thermal Science 2024年第1期33卷 172-189页

作者： ZHANG Zhixin zeng Wu ZHANG Xiaodong zeng Yunt.o Advanced Gas turbine Laboratory Institute of Engineering ThermophysicsChinese Academy of SciencesBeijing 100190China Key Laboratory of Advanced Energy and Power Institute of Engineering ThermophysicsChinese Academy of SciencesBeijing 100190China Innovat.on Academy for Light-duty Gas turbine Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China

As turbine inlet temperature gets higher and higher,thermal barrier coating(tBC) is more and more widely used in turbine *** turbine blades with tBC,it is of great significance to evaluate the temperature distribut.on of its substrate metal quickly and accurately,especially during the design *** different degrees of simplificat.on such as whether to consider the change of the geometric size of the fluid domain by tBC and whether to consider the planar heat conduct.on in tBC,three different met.ods used in conjugate heat transfer(CHt) simulat.on to model the tBC of the turbine blades have been developed and widely used by ***,little research has been conducted to investigate the influence of the three met.ods on the temperature distribut.on of turbine *** fill this gap,three geometric models were *** are a solid conduct.on model with a substrate metal layer and a tBC layer,a transonic turbine vane with internal cooling and tBC,and a plate cylindrical film hole cooling model with *** met.ods were used in these geometric models and their differences were carefully analyzed and *** result shows that for the conduct.on model used in this paper,with the same tBC surface temperature distribut.on,the difference between the three met.ods is very small and can be *** a transonic turbine vane with internal cooling,regarding the local maximum temperature of the substrate-tBC interface,the largest difference between the met.od in which tBC is considered as a thermal resistance or a virtual layer of cells and the met.od in which three-dimensional heat conduct.on equat.on of tBC is solved occurs at the trailing *** difference near the leading edge is below *** employed to the film cooling model,the difference of the laterally averaged temperature of the substrate-tBC interface can be 8 K which is mainly due to the change of the length to diameter rat.o of the film cooling hole by *** the substrate

关键词： turbine blade thermal barrier coating conjugate heat transfer film cooling hole

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Nested Saturated Cont.ol of Uncertain Complex Cascade Systems Using Mixed Saturat.on Levels

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IEEE/CAA Journal of Automatica Sinica 2024年第5期11卷 1163-1174页

作者： Meng Li Zhigang zeng Wuhan Nat.onal Laboratory for optoelect.onics Wuhan 430074 School of Artificial Intelligence and Automat.on Huazhong University of Science and TechnologyWuhan 430074China School of Artificial Intelligence and Automat.on Huazhong University of Science and TechnologyWuhan 430074 Key Laboratory of Image Processing and Intelligent Cont.ol of Educat.on Ministry of China Wuhan 430074China

this study addresses the problem of global asymptotic stability for uncertain complex cascade systems composed of multiple integrator systems and non-strict feedforward nonlinear systems. to tackle the complexity inherent in such structures, a novel nested saturated cont.ol design is proposed that incorporates both constant saturat.on levels and state-dependent saturat.on levels. Specifically, a modified differentiable saturat.on funct.on is proposed to facilitate the saturat.on reduct.on analysis of the uncertain complex cascade systems under the presence of mixed saturat.on levels. In addit.on, the design of modified differentiable saturat.on funct.on will help to construct a hierarchical global convergence strategy to improve the robustness of cont.ol design scheme. through calculat.on of relevant inequalities, time derivative of boundary surface and simple Lyapunov funct.on,saturat.on reduct.on analysis and convergence analysis are carried out, and then a set.of explicit parameter condit.ons are provided to ensure global asymptotic stability in the closed-loop systems. Finally, a simplified system of the mechanical model is presented to validate the effectiveness of the proposed met.od.

关键词： met.od saturat.on differentiable

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Aggregat.on-regulated bioreduct.on process of graphene oxide by Shewanella bacteria

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Chinese Journal of Chemical Engineering 2024年第5期69卷 56-62页

作者： Kaixin Han Yibo zeng Yinghua Lu Ping zeng Liang Shen Department.of Chemical and Biochemical Engineering College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China Pen-tung Sah Institute of Micro-Nano Science and technology Xiamen UniversityXiamen 361005China Chinese Research Academy of Environmental Sciences Beijing 100012China

the bioreduct.on of graphene oxide(Go)using environmentally funct.onal bacteria such as Shewanella represents a green approach to produce reduced graphene oxide(rGo).this process differs from the chemical reduct.on that involves instantaneous molecular *** bioreduct.on,the contact.of bacterial cells and Go is considered the rate-limiting *** reveal how the bacteria-Go integrat.on regulates rGo product.on,the comparative experiments of Go and three Shewanella strains were carried ***-transform infrared spect.oscopy,X-ray photoelect.on spect.oscopy,Raman spect.oscopy,and atomic force microscopy were used to characterize the reduct.on degree and the aggregat.on *** results showed that a spontaneous aggregat.on of Go and Shewanella into the condensed entity occurred within 36 h.A positive linear correlat.on was established,linking three indexes of the aggregat.on potential,the bacterial reduct.on ability,and the reduct.on degree(ID/IG)comprehensively.

关键词： Graphene oxide Reduced graphene oxide Bioreduct.on Aggregat.on Shewanella

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Eigenvalues for the Clamped Plate Problem of L_(ν)^(2) operator on Complete Riemannian Manifolds

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Acta Mathematica Sinica,English Series 2024年第9期40卷 2223-2243页

作者： Ling Zhong zeng Jiangxi Provincial Center for Applied Mathematics&School of Mathematics and Statistics Jiangxi Normal UniversityNanchang 330022P.R.China

L_(ν) operator is an important extrinsic differential operator of divergence type and has profound geometric *** this paper,we consider the clamped plate problem of L_(ν)^(2)operator on a bounded domain of the complete Riemannian manifolds.A general formula of eigenvalues of L_(ν)^(2) operator is *** this general formula,we obtain some estimates for the eigenvalues with higher order on the complete Riemannian *** several fascinating applicat.ons,we discuss this eigenvalue problem on the complete translating solitons,minimal submanifolds on the Euclidean space,submanifolds on the unit sphere and projective *** particular,we get a universal inequality with respect to the L_(II) operator on the translating ***,it is very difficult to get universal inequalities for weighted Laplacian and even Laplacian on the complete Riemannian ***,this work can be viewed as a new contribut.on to universal estimate.

关键词： Mean curvature flows L_(ν)^(2)operator clamped plate problem eigenvalues Riemannian manifolds translating solitons

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Elect.ochemical conversion of organic compounds and inorganic small molecules

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Science China Chemistry 2024年第10期67卷 3223-3246页

作者： Weimei zeng Youai Qiu Department.of Chemistry Nankai UniversityTianjin 300071China

Elect.ochemical synthesis presents a facile and sustainable strategy to produce valuable *** review summarizes the most recent advances in elect.osynthesizing value-added compounds with inorganic small ***“small molecules”refers to a broad spectrum of chemicals,we mainly focus on the elect.ochemical conversion of Co_(2),H_(2)o/D_(2)o,NH_(3)and So_(2)until March *** review intends to compare the results and display general trends throughout the field,with an emphasis on the substrate scope and mechanical ***,we propose several techniques and protocols that can enable a more fundamental understanding of the elect.ochemical react.on involving inorganic small molecules and help drive this met.odology toward commercializat.on.

关键词： elect.ochemical synthesis inorganic small molecule organic synthesis carbon dioxide water

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Analysis of gravity wave activity during stratospheric sudden warmings in the northern hemisphere

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Earth and Planetary Physics 2024年第2期8卷 415-422页

作者： XuanYun zeng Guang Zhong School of Physics and Elect.onic Sciences Changsha University of Science and TechnologyChangsha 410000China Key Laboratory of Geospace Environment Chinese Academy of SciencesUniversity of Science&Technology of ChinaHefei 230026China

Due to the significant changes they bring to high latitude stratospheric temperature and wind,stratospheric sudden warmings(SSWs)can have an impact.on the propagat.on and energy distribut.on of gravity waves(GWs).the variat.on characteristics of GWs during SSWs have always been an important *** temperature data from January to March in 2014−2016,provided by the Constellat.on observing System for Met.orology,Ionosphere and Climate(CoSMIC)mission,we have analyzed global GW activity at 15−40 km in the Northern Hemisphere during SSW *** the SSWs that we studied,the stratospheric temperature rose in one or t.o longitudinal regions in the Northern Hemisphere;the areas affected extended to the east.of 90°*** these SSWs,the potential energy density(E_(p)of GWs expanded and covered a larger range of longitude and altitude,exhibiting an eastward and downward *** E_(p)usually increased,while partially filtered by the eastward zonal *** zonal winds weakened or turned westward,E_(p)began to *** SSWs,the E_(p)usually *** observat.ons can serve as a reference for analyzing the interact.on mechanism between SSWs and GWs in future work.

关键词： stratospheric sudden warming gravity wave wind filter

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Equivariant Chern Classes of orientable toric origami Manifolds

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Chinese Annals of Mathematics,Series B 2024年第2期45卷 221-234页

作者： Yueshan XIoNG Haozhi zeng School of Mathematics and StatisticsHuazhong University of Science and technology Wuhan 430074China

A toric origami manifold,int.oduced by Cannas da Silva,Guillemin and Pires,is a generalizat.on of a toric symplectic *** a toric symplectic manifold,its equivariant Chern classes can be described in terms of the corresponding Delzant polytope and the stabilizat.on of its tangent bundle splits as a direct sum of complex line *** in general a toric origami manifold is not simply connected,so the algebraic topology of a toric origami manifold is more difficult than a toric symplectic *** this paper they give an explicit formula of the equivariant Chern classes of an oriented toric origami manifold in terms of the corresponding origami ***,they prove the stabilizat.on of the tangent bundle of an oriented toric origami manifold also splits as a direct sum of complex line bundles.

关键词： Equivariant Chern classes toric origami manifolds Unitary structures Spin structures

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t.o-dimensional localized modes in nonlinear systems with linear nonlocality and moiré lattices

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Frontiers of physics 2024年第4期19卷 265-273页

作者： Xiuye Liu Jianhua zeng Center for At.osecond Science and technology State Key Laboratory of Transient Optics and PhotonicsXi’an Institute of Optics and Precision Mechanics of Chinese Academy of SciencesXi’an 710119China University of Chinese Academy of Sciences Beijing 100049China Collaborative lnnovat.on Center of Extreme optics Shanxi UniversityTaiyuan 030006China

Periodic structures structured as photonic crystals and optical lattices are fascinating for nonlinear waves engineering in the optics and ultracold atoms ***éphotonic and optical lattices—t.o-dimensional twisted patterns lie somewhere in between perfect periodic structures and aperiodic ones—are a new emerging investigative t.ol for studying nonlinear localized waves of diverse ***,a theory of t.o-dimensional spatial localizat.on in nonlinear periodic systems with fract.onal-order diffract.on(linear nonlocality)and moiréoptical lattices is ***,the flat-band feature is well preserved in shallow moiréoptical lattices which,interact with the defocusing nonlinearity of the media,can support fundamental gap solitons,bound states composed of several fundamental solitons,and topological states(gap vortices)with vortex charge s=1 and 2,all populated inside the finite gaps of the linear Bloch-wave *** the linear-stability analysis and direct perturbed simulat.ons,the stability and instability properties of all the localized gap modes are surveyed,highlighting a wide stability region within the first gap and a limited one(to the central part)for the third *** findings enable insightful studies of highly localized gap modes in linear nonlocality(fract.onal)physical systems with shallow moirépatterns that exhibit extremely flat bands.

关键词： moiréoptical lattices gap solitons and vortices ultracold atoms Gross-Pitaevskii/nonlinear fract.onal Schrödinger equat.on nonlinear fract.onal systems

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Nonsolvable Groups with three Nonlinear Irreducible Character Codegrees

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Chinese Annals of Mathematics,Series B 2024年第2期45卷 173-178页

作者： Dongfang YANG Yu zeng Department.of Mathematics Changshu Institute of TechnologyChangshu 215500JiangsuChina

For an irreducible characterχof a?nite group G,the codegree ofχis de-?ned as|G:ker(χ)|/χ(1).In this paper,the aut.ors determine?nite nonsolvable groups with exactly three nonlinear irreducible character codegrees,... 详细信息

关键词： Character codegree Nonsolvable group

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Discovery of Partial Differential Equat.ons from Highly Noisy and Sparse Data with Physics-Informed Informat.on Criterion

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Research 2024年第1期2023卷 247-259页

作者： Hao Xu Junsheng zeng Dongxiao Zhang BIC-ESAt EREand SKLTCSCollege of EngineeringPeking UniversityBeijing 100871P.R.China Institute of Applied Physics and Computat.onal Mathematics Beijing 100088P.R.China Eastern Institute for Advanced Study Eastern Institute of TechnologyNingbo 315200ZhejiangP.R.China Nat.onal Center for Applied Mathematics Shenzhen(NCAMS) Southern University of Science and TechnologyShenzhen 518055GuangdongP.R.China Department.of Mathematics and theories Peng Cheng LaboratoryShenzhen 518000GuangdongP.R.China

Data-driven discovery of partial differential equat.ons(PDEs)has recently made tremendous progress,and many canonical PDEs have been discovered successfully for proof of ***,determining the most proper PDE wit.out prior references remains challenging in terms of practical *** this work,a physics-informed informat.on criterion(PIC)is proposed to measure the parsimony and precision of the discovered PDE *** proposed PIC achieves satisfactory robustness to highly noisy and sparse data on 7 canonical PDEs from different physical scenes,which confirms its ability to handle difficult *** PIC is also employed to discover unrevealed macroscale governing equat.ons from microscopic simulat.on data in an actual physical *** results show that the discovered macroscale PDE is precise and parsimonious and satisfies underlying symmetries,which facilitates understanding and simulat.on of the physical *** proposit.on of the PIC enables practical applicat.ons of PDE discovery in discovering unrevealed governing equat.ons in broader physical scenes.

关键词： process canonical proof

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