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Identification of nonlinear process described by neural fuzzy Hammerstein-Wiener model using multi-signal processing

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Advances in Manufacturing 2023年第4期11卷 694-707页

作者： feng Li Li jia ya.Gu College of Electrical and Information Engineering Jiangsu University of TechnologyChangzhou213001JiangsuPeople’s Republic of China School of Mechatronics Engineering and Automation Shanghai UniversityShanghai200444People’s Republic of China School of Electrical Engineering and Automation Changshu Institute of TechnologyChangshu215500JiangsuPeople’s Republic of China

In this study,a novel approach for nonlinear process identification via neural fuzzy-based Hammerstein-Wiener model with process disturbance by means of multi-signal processing is *** Hammerstein-Wiener model consists of three blocks where a dynamic linear block is sandwiched between two static nonlinear ***-signal sources are designed for achieving identification separation of the Hammerstein-Wiener *** correlation analysis theory is utilized for estimating unknown parameters of output nonlinearity and linear block using separable signals,thus the interference of process disturbance is ***,the immeasurable intermediate variable and immeasurable noise term in identification model is taken over by auxiliary model output and estimate residuals,and then auxiliary model-based recursive extended least squares parameter estimation algorithm is derived to calculate parameters of the input nonlinearity and noise ***,convergence analysis of the suggested identification scheme is derived using stochastic process *** simulation results indicate that proposed identification approach yields high identification accuracy and has good robustness.

关键词： Nonlinear process Parameter identification Hammerstein-Wiener model Neural fuzzy model Multiple signal processing

The noise spectral characteristics and noise reduction schemes of screw air-source heat pump:A case study

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Building Simulation 2024年第1期17卷 53-70页

作者： Dongsheng Liu ya.han feng Jikang jia Pengfei Si ya.feng China Southwest Architecture Design and Research Institute Co.Ltd. Chengdu 610041China CSCEC Green Construction Engineering Research Center Chengdu 610041China

The screw air-source heat pump can cause incessant high noise levels during operation,which might hinder adoption of this energy-efficient heat ***,acoustic measurements and comparison testing were performed in this *** measurements revealed that the compressor is the main noise source of the heat pump,and it shows a multipeak frequency distribution and a wide frequency spectrum under different work conditions,with multiple peaks at 63,250,and 1000 ***,a compressor sound insulation cover with broadband absorption was proposed,and it was experimentally proven that the insulation cover can reduce the maximum sound pressure level of one unit from 89.8 dBA to 79.1 ***,we proposed several noise reduction strategies and compared their noise reduction effects using computer *** results showed that the noise problem can be effectively improved through the rational design of the sound barrier and the layout and opening options of heat *** distance between the sound barrier and heat pump and the sound attenuation due to diffraction ALa exhibit a U-shaped *** buildings of different heights,the optimal heights of noise barrier are *** 5.5-meter is the optimal height of the sound barrier for single-story *** conclusions can be applied to other building projects for heat pump noise reduction.

关键词： acoustic simulation broadband noise noise reduction air-source heat pump sound barrier

Isothermal oxidation behavior of a new Re-free nickel-based single-crystal superalloy at 950℃

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Rare Metals 2017年第8期36卷 617-621页

作者： Xue-feng Zhou Guang Chen ya.ya.feng Zhi-Xiang Qi Min-Zhi Wang Pei Li jia-Lin Cheng Engineering Research Center of Materials Behavior and Design Ministry of Education Nanjing University of Science and TechnologyNanjing 210094China School of Chemistry and Materials Engineering Changshu Institute of TechnologyChangshu 215500China School of Materials Science and Engineering Nanjing Instituteof TechnologyNanjing 211167China

The isothermal oxidation behavior of a new Refree nickel-based single-crystal superalloy in air at 950 ℃ for 200 h was studied by scanning electron microscopy（SEM）with energy-dispersive spectroscopy（EDS）and X-ray diffraction（XRD）.The results indicate that oxidation kinetics obeys parabolic law approximately,and the mass gain increases rapidly during initial oxidation stage and then gradually slows *** oxidation scales are composed of three layers：the outer layer mainly consists of NiO with a small amount of CoO;the intermediate layer is mainly composed of Cr_2O_3 with a small amount of spinel compounds such as CrTaO_4,NiCr_2O_4,CoCrAl_2O_4,CoAl_2O_4,and NiAl_2O_4;and the inner layer is composed of Al_2O_*** Al_2O_3 layer suppresses the diffusion of elements between oxygen and alloy elements,slows down the alloy oxidation speed,and also suppresses the growth of the oxide scale and reduces the oxidation rate,which is agreeable with the oxidation kinetics.

关键词： Nickel-based single-crystal superalloy Isothermal oxidation Oxidation kinetic Surfacemorphology

Bullous pemphigoid associated with acquired hemophilia A: A case report

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World Journal of Clinical Cases 2025年第4期13卷 28-33页

作者： Su-Ye Hu Meng-Can Li Zi-jia Hao Xu-ya.Chai Pei-Sai Li ya.g Liu Li-Xia Liu Ying Xu Pan-Pan ya.g Ling-E Li Department of Dermatology Shijiazhuang Traditional Chinese Medicine HospitalShijiazhuang 050051Hebei ProvinceChina Graduate School Hebei University of Traditional Chinese MedicineShijiazhuang 050051Hebei ProvinceChina Department of Pathology Shijiazhuang Traditional Chinese Medicine HospitalShijiazhuang 050051Hebei ProvinceChina

BACKGROUND Acquired hemophilia A (AHA) is a rare and potentially severe bleeding disordercaused by circulating autoantibodies against factor Ⅷ (FⅧ). In approximately50% of the patients, the condition is associated with autoimmune diseases,cancers, medication use, pregnancy, and the post-partum period. Bullous pemphigoid(BP) is a chronic autoimmune subepidermal blistering disease associatedwith tissue-bound and circulating autoantibodies against BP antigens 180 (BP180)and 230 (BP230). AHA-associated BP has a high mortality rate;hence, the understandingof this disease must *** SUMMARY A 69-year-old man presented with erythema, blisters, blood blisters, and crustsaccompanied by severe pruritus for more than 20 days, and ecchymosis andswelling on his left upper arm for 3 days. Pathological examination revealed asubepidermal blister that contained eosinophils. Laboratory tests showed that theBP180 autoantibody levels had increased, isolated activated partial thromboplastintime was notably prolonged (115.6 s), and coagulation FⅧ activity wasextremely low (< 1.0%). Furthermore, the FⅧ inhibitor titer had greatlyincreased (59.2 Bethesda units). Therefore, the patient was diagnosed as having BP associated with AHA, prescribed 0.05% topical halometasone cream, and transferred to a higher-level hospitalfor effective treatment;however, he died after 2 *** AHA associated BP is rare, dangerous, and has a high mortality rate. Therefore, its timely diagnosis and effectivetreatment are necessary.

关键词： Bullous pemphigoid Acquired hemophilia A Acquired hemophilia A FactorⅧ Case report

Aluminum matrix composites reinforced by molybdenum-coated carbon nanotubes

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International Journal of Minerals,Metallurgy and Materials 2011年第6期18卷 695-702页

作者： Jun-hui Nie Cheng-chang jia Na Shi ya.feng Zhang Yi Li Xianjia School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China

To extend the application of carbon nanotubes （CNTs） and explore novel aluminum matrix composites,CNTs were coated by molybdenum layers using metal organic chemical vapor deposition,and then Mo-coated CNT （Mo-CNT）/Al composites were prepared by the combination processes of powder mixing and spark plasma *** influences of powder mixing and Mo-CNT content on the mechanical properties and electrical conductivity of the composites were *** results show that magnetic stirring is better than mechanical milling for mixing the Mo-CNTs and Al *** electrical conductivity of the composites decreases with increasing Mo-CNT *** the Mo-CNT content is 0.5wt%,the tensile strength and hardness of Mo-CNT/Al reach their maximum *** tensile strength of 0.5wt% Mo-CNT/Al increases by 29.9%,while the electrical conductivity only decreases by 7.1%,relative to sintered pure *** phase analysis of Mo-CNT/Al composites reveals that there is no formation of Al carbide in the composites.

关键词： carbon nanotubes aluminum matrix composites molybdenum layer mechanical properties electrical conductivity

Rational design and synthesis of advanced metal-organic frameworks for electrocatalytic water splitting

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Science China Chemistry 2023年第4期66卷 943-965页

作者： Yu-jia Tang ya.Qian Lan School of Chemistry and Materials Science Institute of Advanced Materials and Flexible Electronics(IAMFE)Nanjing University of Information Science and TechnologyNanjing 210044China School of Chemistry South China Normal UniversityGuangzhou 510006China

As a promising and significant technology for hydrogen production,electrocatalytic water splitting is a research hotspot in the energy conversion field for alleviating the global energy crisis and achieving carbon neutrality ***-organic frameworks(MOFs)have been widely investigated as catalyst candidates with remarkable activity and long-term electrocatalysis durability owing to their precise and tailorable structures:tunable pore channels in the range of micropore/mesopore promote the mass/electron transfer;high specific surface areas expose abundant active species;modified metal nodes can serve as active sites;versatile organic ligands can be functionalized to further enhance the electrocatalytic *** this review,recent advances in the rational design and synthesis of advanced MOF electrocatalysts for water splitting are presented in the following ***,we analyze the design concepts of MOF electrocatalysts from the perspective of their distinct and modifiable ***,three common synthesis techniques of MOF electrocatalysts are briefly ***,we focus on the classification of different MOFs for robust electrocatalytic water splitting,including pristine MOFs,mixed-metallic MOFs,MOF nanosheets,electrically conductive MOFs,MOFs on substrates,and polyoxometalate-based ***,summary and outlook are proposed to uncover the next generation of advanced MOFs for electrochemical energy conversion applications.

关键词： metal-organic frameworks water splitting electrocatalysis hydrogen evolution reaction oxygen evolution reaction polyoxometalates

Influence of the Gaussian colored noise and electromagnetic radiation on the propagation of subthreshold signals in feedforward neural networks

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Science China(Technological Sciences) 2021年第4期64卷 847-857页

作者： GE Mengya. WANG GuoWei jia ya Department of Physics Central China Normal UniversityWuhan 430079China

Iterative methods are used to simulate the in vitro feedforward neural networks in physiological *** can be propagated to a minimum of ten ***,the discharge activity of each group will be more *** feedforward neural networks have a wide range of applications in machine learning,and the weight of synapses considerably influences the propagation of weak ***,we investigated the effect of Gaussian colored noise and electromagnetic radiation on the propagation of the subthreshold excitatory postsynaptic current signals in the input layer of the multilayer Izhikevich neural feedforward *** the absence of electromagnetic radiation,the excitatory postsynaptic current signal is stably propagated and amplified in multilayer feedforward neural networks under the optimal Gaussian colored noise strength or correlation time in the output layer of the *** with the case in which there is no electromagnetic radiation,the presence of electromagnetic radiation slightly reduces the propagation of weak ***,the time required to propagate the excitatory postsynaptic current signal to the output layer increases with the increasing feedback *** feedforward neural network considered in this study is a considerably simple *** complex structures,such as backward connection and delayed feedback,can be observed in real biological ***,the next step will be to study more complex neural models with neuron models based on the physiological experimental data and compare them with real biological ***,the study of neural networks can be combined with an experimental study about the auditory nervous system of bats to understand the biological mechanism associated with the auditory system function of bats from two perspectives.

关键词： feedforward neural network colored noise electromagnetic radiation signal propagation

Influence of Random Potentials on the Current of the Molecular Motor Model

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Chinese Physics Letters 2001年第11期18卷 1431-1434页

作者： jia ya.LI jia-rong Department of Physics Huazhong Normal UniversityWuhan 430079 Institute of Particle Physics:Huazhong Normal University Wuhan 430079

The current of the molecular motor model disturbed by random potentials, which involve the dichotomous and Ornstein-Uhlenbeck potentials, is studied using a finite-space correlation function. It is found that: (i) the amplitude and the correlation length of random potentials play opposing roles in the transport of the molecular motor model;(ii) a random potential with small amplitude and large correlation length is very useful in the molecular motor system.

关键词： function. disturbed Molecular

Fabrication and thermal conductivity of copper matrix composites reinforced by tungsten-coated carbon nanotubes

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International Journal of Minerals,Metallurgy and Materials 2012年第5期19卷 446-452页

作者： Jun-hui Nie Cheng-chang jia Xianjia Yi Li ya.feng Zhang Xue-bing Liang School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China China Iron ＆ Steel Research Institute Group Beijing 100081 China

Carbon nanotubes （CNTs） were coated by tungsten using metal organic chemical vapor deposition. Magnetic stirring was employed to disperse the W-coated CNTs （W-CNTs） in a Cu matrix, and then, the mixed powders were consolidated by spark plasma sintering. The W-CNTs obtained a uniform dispersion within the Cu matrix when the W-CNT content was less than 5.0vo1%, but high content of W-CNTs （10vol%） resulted in the presence of clusters. The W-CNT/Cu composites containing low content of W-CNTs （〈5.0vol%） exhibited a higher thermal conductivity than the sintered pure Cu, while the CNT/Cu composites exhibited no increase in thermal conductivity after the incorporation of uncoated CNTs. The W-CNT content was found to play a crucial role in determining the thermal conductivity of the W-CNT/Cu composites. The thermal conductivity of the W-CNT/Cu composites increased first and then decreased with the W-CNT content increasing. When the W-CNT content was 2.5vo1%, the W-CNT/Cu composite obtained the maximum value of thermal conductivity. The thermal resistance of the （W-CNT）-Cu interface was predicted in terms of Maxwell-Gamett effective medium approximation, and its calculated value was about 3.0× 10-9 m2.K.W-l.

关键词： metallic matrix composites (MMCs) carbon nanotubes tungsten copper spark plasma sintering thermal conductivity