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Low-thermal-conductivity thermal barrier coatings with a multi-scale pore design and sintering resistance following thermal exposure

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Rare Metals 2020年第4期39卷 352-367页

作者： wei-wei Zhang Zhi-yuan wei Li-yuan Zhang Ya-Zhe Xing Qiang Zhang School of Materials Science and Engineering Chang'an UniversityXi'an 710064China State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and EngineeringXi’an Jiaotong UniversityXi'an 710049China College of Chemistry and Chemical Engineering Neijiang Normal UniversityNeijiang 641112China AECC Beijing Institute of Aeronautical Material Beijing 100095China

High-insulation,long-life thermal barrier coatings(TBCs)decrease the service temperature of superalloys and improve the service life of gas *** in the thermal insulation properties of the coating mainly depends on the optimization of the TBC *** important challenge for TBCs is maintaining a high performance during thermal exposure without degradation,as the pore-rich structure of the topcoat would inevitably be transformed by sintering.A low-thermalconductivity anti-sintering coating can overcome the tradeoff between thermal insulation and sinter *** this review,the design,preparation,and serviceability evaluation of a low-thermal-conductivity anti-sintering coating will be ***,directions for potential development are *** paper provides a comprehensive understanding of the structured tailoring of TBCs for better thermal insulation and anti-sintering performance.

关键词： Thermal barrier coatings Multi-scale pore Sintering resistance Low thermal conductivity

A weighted fuzzy C-means clustering method for hardness prediction

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Journal of Iron and Steel Research International 2023年第1期30卷 176-191页

作者： yuan Liu Shi-zhong wei School of Materials Science and Engineering Henan University of Science and TechnologyLuoyang 471003HenanChina School of Aerospace Engineering Zhengzhou University of AeronauticsZhengzhou 450015HenanChina National Joint Engineering Research Center for Abrasion Control and Molding of Metal Materials Henan University of Science and TechnologyLuoyang 471003HenanChina

The hardness prediction model was established by support vector regression(SVR).In order to avoid exaggerating the contribution of very tiny alloying elements,a weighted fuzzy C-means(WFCM)algorithm was proposed for data clustering using improved Mahalanobis distance based on random forest importance values,which could play a full role of important features and avoid clustering center *** samples were divided into two *** top 10 features of each class were selected to form two feature subsets for better performance of the *** dimension and dispersion of features decreased in such feature *** four machine learning algorithms,SVR had the best performance and was chosen to *** hyper-parameters of the SVR model were optimized by particle swarm *** samples in validation set were classified according to minimum distance of sample to clustering centers,and then the SVR model trained by feature subset of corresponding class was used for *** with the feature subset of original data set,the predicted values of model trained by feature subsets of classified samples by WFCM had higher correlation coefficient and lower root mean square *** indicated that WFCM was an effective method to reduce the dispersion of features and improve the accuracy of model.

关键词： Hardness prediction weighted fuzzy C-means algorithm Feature selection Particle swarm optimization Support vector regression Dispersion reduction

Follicular lymphoma with cardiac involvement in a 90-year-old patient:A case report

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World Journal of Clinical Cases 2022年第28期10卷 10208-10213页

作者： Yi-Xuan Sun jia Wang ji-Heng Zhu wei yuan Lin Wu Department of Geriatrics Zhongshan HospitalFudan UniversityShanghai 200032China Department of Pathology Zhongshan HospitalFudan UniversityShanghai 200032China

BACKGROUND The incidence of cardiac lymphoma is low,and it mainly occurs secondary to nonHodgkin’s lymphoma,particularly diffuse large B-cell ***,we report a case of follicular lymphoma with cardiac involvement and severe heart failure as the sole clinical *** SUMMARY A 90-year-old male patient was first admitted to our hospital due to an accidentally discovered painless mass in the right lower abdomen.A biopsy of the mass revealed a follicular *** emission tomography-computed tomography confirmed mild pericardial effusion,and echocardiography showed no structural abnormalities with normal ejection fraction at the time of *** patient refused our recommendation of chemotherapy and was re-admitted 4 mo later due to heart failure.A series of subsequent echocardiographic examinations showed thickening of the left ventricular walls and increasing pericardial effusion over the following 2 *** heart failure exacerbated despite all symptomatic and supportive *** passed away after an episode of aspiration *** The diagnosis of cardiac lymphoma is difficult as its clinical manifestations are nonspecific,and prognosis is poor.

关键词： Follicular lymphoma Cardiac lymphoma Chemotherapy Heart failure Elderly patient Case report

Innovative dual-mode device integrating capacitive desalination and solar vapor generation for high-efficiency seawater desalination

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Journal of Energy Chemistry 2025年第1期 171-179页

作者： jiacheng Wang Zhaoyu Chen Ruduan yuan jiaxin Luo Ben Zhang Keju ji Meng Li Juanxiu Xiao Kuan Sun National Innovation Center for Industry-Education Integration of Energy Storage Technology MOE Key Laboratory of Low-grade Energy Utilization Technologies and SystemsCollege of Energy & Power Engineering Chongqing University Xuefeng Mountain Energy Equipment Safety National Observation and Research Station CQU-NUS Renewable Energy Materials & Devices Joint Laboratory Chongqing University Southwest Technology and Engineering Research Institute jiangsu Provincial Key Laboratory of Bionic Functional Materials College of Mechanical and Electrical Engineering Nanjing University of Aeronautics and Astronautics State Key Laboratory of Marine Resources Utilization in South China Sea Collaborative Innovation Center of Marine Science and Technology School of Marine Science and Engineering Hainan University

Solar-driven interface evaporation with high solar-to-steam conversion efficiency has shown great potential in seawater ***,due to the influence of latent heat and condensation efficiency,the water yield from solar-driven interface evaporation remains insufficient,posing a significant challenge that requires *** this work,we designed a dual-mode high-flux seawater desalination device that combines solar-driven interface evaporation and capacitive *** utilizing coupled desalination materials exhibiting both photothermal conversion and capacitance activity,the device demonstrated photothermal evaporation rates of 1.41 and 0.97 kg m-2h-1for condensate water yield under one-sun ***,the device exhibited a salt adsorption capacity of up to48 mg g-1and a salt adsorption rate of 2.1 mg *** addition,the salt adsorption capacity increased by approximately 32% under one-sun ***,photo-enhanced capacitive desalination performance was explored through numerical simulations and theoretical *** calculations and characterizations confirmed that the defect energy levels formed by the introduction of sulfur vacancies can effectively widen the light absorption range,improve photothermal conversion performance,and stimulate more photoelectrons to participate in capacitive ***,the electron distribution state of molybdenum disulfide with sulfur vacancies and surface defect sites contributes to ion/electron transport at the solid-liquid *** work provides a novel pathway for integrating solar vapor generation with other low-energy desalination technologies.

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Endogenous/exogenous dual stimulation“ROS engineering”amplification combined with autophagy-augmented for efficient ferroptosis therapy

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Nano Research 2025年第1期18卷 597-606页

作者： Pengye Du Pengpeng Lei yuan Liang Ran An Yi wei Shuyu Liu jianhao Zheng Hongjie Zhang State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China School of Applied Chemistry and Engineering University of Science and Technology of ChinaHefei 230026China Department of Chemistry Tsinghua UniversityBeijing 100084China

“Reactive oxygen species(ROS)engineering”is one of the most promising anti-tumor treatments developed in recent *** explosion of ROS will cause oxidative stress,thereby inducing tumor cell ***,ROS accumulation in tumor cells is eliminated by endogenous cellular self-regulation *** this work,a kind of endogenous/exogenous dual stimulation nanoagent noted as UMZC is *** reaction occurs between NH_(2)-MIL-88B(Fe)contained in UMZC and the overexpression of endogenous H_(2)O_(2)to generate ROS,amplified by endogenous H_(2)S of colon tumor *** addition,NH_(2)-MIL-88B(Fe)also functions to deplete glutathione(GSH)for stopping it from consuming *** nanoparticles at the core of UMZC convert near-infrared into visible light,which excites zinc phthalocyanine to initiate the photochemical reaction that generates more ROS,thus alleviating the lack of tissue penetration depth for visible *** agonist chitosan oligosaccharides induce enhancement of cellular autophagy for disrupting cellular metabolic stress and the resistance to oxidative stress of tumor cells,allowing“ROS engineering”to fully exert anti-tumor *** of ROS generation,GSH depletion,and induced cellular autophagy caused by nanoagents have promoting effects on the occurrence of ***,the nanoagents show the ability to effectively treat colon tumors.

关键词： reactive oxygen species(ROS)engineering upconversion nanoparticles cellular autophagy ferroptosis tumor therapy

High Thermal Stable Polyimide Resins Derived from Phenylethynyl-endcapped Fluorenyl Oligoimides with Low Melt Viscosities

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Chinese Journal of Polymer Science 2016年第8期34卷 933-948页

作者： wei Chen Mian ji 杨士勇 Laboratory of Advanced Polymer Materials Institute of ChemistryChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China

To improve the processability and thermal stability of polyimide, a series of novel phenylethynyl-endcapped oligoimides （PEPA-oligoimides） with calculated molecular weights （M_nC） were successfully prepared from thermal imidization of 4,4＇-（9-fluorenylidene） dianiline （BAFL） as fluorenyl diamine, 4,4＇-oxy-diphthalic anhydride （ODPA） as aromatic dianhydride and 4-phenylethynylphthalic anhydride （4-PEPA） acted as reactive end-capping reagent at elevated temperatures. Experiment results indicated that the oligoimides were the mixtures of PEPA-endcapped oligomers with different degrees of polymerization characterized by MALDI-TOF mass spectra. The influence of chemical structures on the melt processabilities of the oligoimides, the thermal, dielectric and mechanical properties of the thermoset resins was studied. The typical oligoimide resin owned minimum melt viscosity of 0.2 Pa＇s at around 310 ℃and wide melting processing window, suitable for resin transfer molding （RTM）. Besides, its corresponding thermal-cured polyimide resin possessed glass transition temperature （T_g） as high as 514 ℃. The dielectric constants of polyimide resins decreased from 3.15 to 2.80 by reducing the M_nC. The mechanical properties of the polyimide neat resins were improved gradually with increasing M_nC. Finally, the carbon fiber/polyimide （C_f/PI） composite laminates showed excellent mechanical strength retention rate at 350 ℃, might be long-term served at extremely high temperature in aerospace and aviation field.

关键词： Polyimide Fluorene Proccessability Thermal stability Composite.

An Adaptive Regulation Problem and Its Application

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International Journal of Automation and computing 2017年第2期14卷 221-228页

作者： yuan jiang ji-Yang Dai Key Laboratory of Image Processing and Pattern Recognition Nanchang Hangkong University Nanchang 330063 China School of Information Engineering Nanchang Hangkong University Nanchang 330063 China

This paper studies an adaptive regulation problem for the modified FitzHugh-Nagumo neuron model under external electrical stimulation. We first present the solution of the global robust output regulation problem for output feedback system with an uncertain exosystem which models the external electrical stimulation with unknown frequency and amplitude. Then, we show that the robust control problem for the modified FitzHugh-Nagumo neuron model can be formulated as the global robust output regulation problem and the solvability conditions for the output regulation problem for the modified FitzHugh-Nagumo neuron model are all satisfied. Then, we apply the obtained output regulation result to constructing an output feedback control law for the modified FitzHugh-Nagumo neuron model to achieve global stability of the closed-loop system in the presence of uncertain parameters and external stimulus. An example is given to show that the proposed algorithm can completely reject the external electrical stimulation.

关键词： Control theory Lyapunov methods internal model principle modified FitzHugh-Nagumo model.

Robustness of critical points in a complex adaptive system： Effects of hedge behavior

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Frontiers of physics 2013年第4期8卷 461-466页

作者： yuan Liang ji-Ping Huang Department of Physics and State Key Laboratory of Surface Physics Fudan University Shanghai 200433 China Department of Physics College of Science Donghua University Shanghai 201602 China

In our recent papers, we have identified a class of phase transitions in the market-directed resource- allocation game, and found that there exists a critical point at which the phase transitions occur. The critical point is given by a certain resource ratio. Here, by performing computer simulations and theoretical analysis, we report that the critical point is robust against various kinds of human hedge behavior where the numbers of herds and contrarians can be varied widely. This means that the critical point can be independent of the total number of participants composed of normal agents, herds and contrarians, under some conditions. This finding means that the critical points we identified in this complex adaptive system （with adaptive agents） may also be an intensive quantity, similar to those revealed in traditional physical systems （with non-adaptive units）.

关键词： complex adaptive system phase transition resource allocation hedge behavior agent-based simulation

STEM教育赋能教育强国建设:逻辑解构、问题剖析与发展策略

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广西师范大学学报（哲学社会科学版） 2025年第1期61卷 58-71页

作者：袁磊徐济远梁世松广西师范大学教育学部广西桂林541004 广西师范大学教育区块链与智能技术教育部重点实验室广西桂林541004

教育强国政策引领下,教育、科技、人才三者的协同发展是推动国家科创资源整合、未来产业发展、加快形成新质生产力的关键。而STEM教育是能衔接三者、充分发挥三者的协同发展作用的关键一环。分析中美STEM教育相关的政策文本,发现我国STE... 详细信息

教育强国政策引领下,教育、科技、人才三者的协同发展是推动国家科创资源整合、未来产业发展、加快形成新质生产力的关键。而STEM教育是能衔接三者、充分发挥三者的协同发展作用的关键一环。分析中美STEM教育相关的政策文本,发现我国STEM教育发展存在的潜在问题有三:价值错位、功能受限、生态缺失。未来要充分发挥STEM教育对教育强国建设的赋能作用,应采取三大发展策略:明确STEM教育价值定位,构建STEM教育实践指南和建设STEM教育领域融合生态。唯有多管齐下、系统推进,我国STEM教育才能真正突破发展瓶颈,焕发勃勃生机,为培养新质人才、服务国家发展战略贡献应有力量,从而推动教育强国建设迈向新的高度。

关键词： STEM教育教育强国新质人才新质生产力中国式教育现代化