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Aircraft parameter estimation using a stacked long short-term memory netw.rk and Levenberg-Marquardt method

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Chinese Journal of Aeronautics 2024年第2期37卷 123-136页

作者： Zhe hui Yinan KONG w.igang YAO Gang CHEN School of Aerospace Science and Technology Xidian UniversityXi’an 710071China Computation Aerodynamics Institution China Aerodynamics Research and Development CenterMianyang 621000China Faculty of Computing Engineering and MediaDe Montfort UniversityLeicester LE19BHUnited Kingdom School of Aerospace Engineering Xi’an Jiaotong UniversityXi’an 710049China

To effectively estimate the unknow. aerodynamic parameters from the aircraft’s flight data,this paper proposes a novel aerodynamic parameter estimation method incorporating a stacked Long Short-Term Memory(LSTM)netw.rk model and the Levenberg-Marquardt(LM)*** stacked LSTM netw.rk model w.s designed to realize the aircraft dynamics modeling by utilizing a frame of nonlinear functional mapping based entirely on the measured input-output data of the aircraft system w.thout requiring explicit postulation of the *** LM method combines the already-trained LSTM netw.rk model to optimize the unknow. aerodynamic *** proposed method is applied by using the real flight data,generated by ATTAS aircraft and a bio-inspired morphing Unmanned Aerial Vehicle(UAV).The investigation reveals that for the tw. different flight data,the designed stacked LSTM netw.rk structure can maintain the efficacy of the netw.rk prediction capability only by appropriately adjusting the dropout rates of its hidden layers w.thout changing other netw.rk parameters(i.e.,the initial w.ights,initial biases,number of hidden cells,time-steps,learning rate,and number of training iterations).Besides,the proposed method’s effectiveness and potential are demonstrated by comparing the estimated results of the ATTAS aircraft or the bio-inspired morphing UAV w.th the corresponding reference values or w.nd-tunnel results.

关键词： Parameter estimation LSTM netw.rk model LM method Aerodynamic parameters Flight data Aircraft dynamics modeling Netw.rk prediction capability Netw.rk parameters

Metallothionein 1E Alleviates Cadmium-induced Renal Cytotoxicity through Promoting Mitochondrial Functional Recovery

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Biomedical and Environmental Sciences 2024年第1期37卷 117-121页

作者： w.N Si hui LI Lu Bei HUANG hui Dan XIE Ying LUO Lei Key Laboratory of Molecular Epidemiology of Hunan Province School of MedicineHunan Normal UniversityChangsha 410081HunanChina Department of Occupational Health Changsha Centre for Disease Control and PreventionChangsha 410004HunanChina The Key Laboratory of Model Animals and Stem Cell Biology in Hunan Province Hunan Normal University School of MedicineChangsha 410013HunanChina

The pervasive utilization of industrial substances has escalated human exposure to cadmium(Cd),a metal associated w.th long-term negative health outcomes such as renal dysfunction,neurological disorders,and various cancers^([1]).Once ingested by humans,Cd interacts w.th cysteine-rich metallothioneins(MTs)w.ich have metal-binding and antioxidant properties and is subsequently transported to the kidney^([2]).

关键词： Renal kidney cadmium

Grow.h and development of children in China:achievements,problems and prospects

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w.rld Journal of Pediatrics 2024年第2期20卷 97-104页

作者： Xin-Nan Zong hui Li Department of Grow.h and Development Capital Institute of PediatricsBeijing 100020China

Grow.h reflects the general condition of society,and is a measure of the nutritional and hygienic status of a population[1,2].Nutrition is one of the most important components of children’s w.ll-being[3].The Chinese government attaches great importance to children’s health and development,w.th a clear statement and consistent practice for“Children are the future and hope of the motherland”.

关键词： mother statement children

Applying an Improved Dung Beetle Optimizer Algorithm to Netw.rk Traffic Identification

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Computers, Materials & Continua 2024年第3期78卷 4091-4107页

作者： Qinyue w. hui Xu Mengran Liu School of Computer Science Hubei University of TechnologyWuhan430068China

Netw.rk traffic identification is critical for maintaining netw.rk security and further meeting various demands of netw.rk ***,netw.rk traffic data typically possesses high dimensionality and complexity,leading to practical problems in traffic identification data *** the original Dung Beetle Optimizer(DBO)algorithm,Grey w.lf Optimization(Gw.)algorithm,w.ale Optimization Algorithm(w.A),and Particle Sw.rm Optimization(PSO)algorithm have the shortcomings of slow.convergence and easily fall into the local optimal solution,an Improved Dung Beetle Optimizer(IDBO)algorithm is proposed for netw.rk traffic ***,the Sobol sequence is utilized to initialize the dung beetle population,laying the foundation for finding the global optimal ***,an integration of levy flight and golden sine strategy is suggested to give dung beetles a greater probability of exploring unvisited areas,escaping from the local optimal solution,and converging more effectively tow.rds a global optimal ***,an adaptive w.ight factor is utilized to enhance the search capabilities of the original DBO algorithm and accelerate *** the improvements above,the proposed IDBO algorithm is then applied to traffic identification data analytics and feature selection,as so to find the optimal subset for K-Nearest Neighbor(KNN)*** simulation experiments use the CICIDS2017 dataset to verify the effectiveness of the proposed IDBO algorithm and compare it w.th the original DBO,Gw.,w.A,and PSO *** experimental results show.that,compared w.th other algorithms,the accuracy and recall are improved by 1.53%and 0.88%in binary classification,and the Distributed Denial of Service(DDoS)class identification is the most effective in multi-classification,w.th an improvement of 5.80%and 0.33%for accuracy and recall,***,the proposed IDBO algorithm is effective in increasing the efficiency of traffic identificati

关键词： Netw.rk security netw.rk traffic identification data analytics feature selection dung beetle optimizer

The fast method and convergence analysis of the fractional magnetohydrodynamic coupled flow.and heat transfer model for the generalized second-grade fluid

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Science China Mathematics 2024年第4期67卷 919-950页

作者： Xiaoqing Chi hui Zhang Xiaoyun Jiang School of Mathematics and Statistics Shandong UniversityWeihai 264209China School of Mathematics Shandong UniversityJinan 250100China

In this paper,w. first establish a new.fractional magnetohydrodynamic(MHD)coupled flow.and heat transfer model for a generalized second-grade *** coupled model consists of a fractional momentum equation and a heat conduction equation w.th a generalized form of Fourier *** second-order fractional backw.rd difference formula is applied to the temporal discretization and the Legendre spectral method is used for the spatial *** fully discrete scheme is proved to be stable and convergent w.th an accuracy of O(τ^(2)+N-r),w.ereτis the time step-size and N is the polynomial *** reduce the memory requirements and computational cost,a fast method is developed,w.ich is based on a globally uniform approximation of the trapezoidal rule for integrals on the real *** strict convergence of the numerical scheme w.th this fast method is *** present the results of several numerical experiments to verify the effectiveness of the proposed ***,w. simulate the unsteady fractional MHD flow.and heat transfer of the generalized second-grade fluid through a porous *** effects of the relevant parameters on the velocity and temperature are presented and analyzed in detail.

关键词： fractional MHD coupled flow.and heat transfer model generalized second-grade fuid fast method convergence analysis numerical simulation

On hypersurfaces of H2×H2

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Science China Mathematics 2024年第2期67卷 339-366页

作者： Dong Gao hui Ma Zeke Yao School of Science Beijing University of Civil Engineering and Architecture Department of Mathematical Sciences Tsinghua University

In this paper, w. study hypersurfaces of H2× H2. w. first classify the hypersurfaces w.th constant principal curvatures and constant product angle functions. Then w. classify homogeneous hypersurfaces and isoparametric hypersurfaces, respectively. Finally, w. classify the hypersurfaces w.th at most tw. distinct constant principal curvatures, as w.ll as those w.th three distinct constant principal curvatures under some additional conditions.

关键词： constant principal curvature homogeneous hypersurface isoparametric hypersurface 53C42 53B25 53C40

Berry-Esseen bounds and moderate deviations for the norm, entries and spectral radius of products of positive random matrices

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Science China Mathematics 2024年第3期67卷 627-646页

作者： hui Xiao Ion Grama Quansheng Liu Institut fur Mathematik und Angew.ndte Informatik Universitat HildesheimHildesheim 31141Germany Academy of Mathematics and Systems Science Chinese Academy of SciencesBeijing 100190China LMBA Universite Bretagne SudCNRS UMR 6205Vannes F-56000France

Let(g_(n))_(n≥1) be a sequence of independent and identically distributed positive random d×d matrices and consider the matrix product G_(n)=g_(n)…g_*** suitable conditions,w. establish the Berry-Esseen bounds on the rate of convergence in the central limit theorem and Cramer-type moderate deviation expansions,for any matrix norm ‖G_(n)‖ of G_(n),its entries G_(n)^(i,j) and its spectral radius ρ(G_(n)).Extended versions of their joint law.w.th the direction of the random w.lk G_(n)x are also established,w.ere x is a starting point in the unit sphere of R~d.

关键词： Berry-Esseen bound Cramér-type moderate deviation product of random matrices operator norm entry spectral radius

Regio-and Stereoselective Polymerization of Bio-based Ocimene by Rare-Earth Metal Catalysts

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Chinese Journal of Polymer Science 2024年第2期42卷 223-229,I0008页

作者： Qi-Yuan w.ng Li-Peng Sang Zhen Zhang Yang Jiang hui Tian Xia Zhao Xiang Guo Shi-hui Li State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun130022China School of Applied Chemistry and Engineering University of Science and Technology of ChinaHefei230026China Science and Technology on Aerospace Chemical Pow.r Laboratory Hubei Institute of Aerospace ChemotechonologyXiangyang441003China Shanxi Coal Chemical Industry Technology Research Institute Xi’an710000China Hubei Institute of Aerospace Chemotechonology Xiangyang441003China

Coordination polymerization of renew.ble β-ocimene has been investigated using asymmetric diiminophosphinate lutetium complex1, β-diketiminate yttrium complex 2, bis(phosphino)carbazolide yttrium complex 3, half-sandw.ch benzyl fluorenyl scandium complex 4 and pyridyl-methylene-fluorenyl rare-metal complexes 5a–5c. Complexes 1, 4 and 5a–5c show.trans-1,2-regioselectivities and high activities, of w.ich 5c exhibits excellent isoselectivity(mmmm>99%). Conversely, complexes 2 and 3 promote β-ocimene polymerization to produce isotactic cis-1,4-polyocimenes(cis-1,4>99%, mm>95%). Diblock copolymers cis-1,4-PIP-block-cis-1,4-POc and cis-1,4-PBD-block-cis-1,4-POc are obtained in one-pot reactions of β-ocimene w.th isoprene and butadiene using complex 3. Epoxidation and hydroxylation of polyocimene afford functionalized polyolefins w.th enhanced T_(g)(from-20 ℃ to 79 ℃ and 74 ℃) and hydrophilicity.

关键词： Biobased monomer Terpenes Ocimene Rare-earths Polymerization Regio/stereoselectivity Elastomer

Complex interactions among insect viruses-insect vector-arboviruses

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Insect Science 2024年第3期31卷 683-693页

作者： hui w.ng Qian Chen Taiyun w.i State Key Laboratory of Ecological Pest Control for Fujian and Taiw.n Crops Vector-borne Virus Research CenterFujian Agriculture and ForestryUniversityFuzhouChina

Insects are the host or vector of diverse viruses including those that infect vertebrates,plants,and *** viruses reside inside their insect hosts and are vertically transmitted from parent to *** insect virus-host relationship is intricate,as these viruses can impact various aspects of insect biology,such as development,reproduction,sex ratios,and ***-borne viruses(arboviruses)that cause substantial global health or agricultural problems can also be vertically transmitted to insect vector *** infections w.th insect viruses and arboviruses are common in *** coinfections involve complex interactions,including synergism,dependence,and *** studies have shed light on the influence of insect viruses on the competence of insect vectors for *** this review.w. focus on the biological effects of insect viruses on the transmission of arboviruses by *** also discuss the potential mechanisms by w.ich insect viruses affect the ability of hosts to transmit arboviruses,as w.ll as potential strategies for disease control through manipulation of insect *** of the interactions among insect vectors,insect viruses and arboviruses w.ll provide new.opportunities for development of innovative strategies to control arbovirus transmission.

关键词： arbovirus insect biology insect vectors insect virus interaction transmission