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Experimental study of dual nano-network, high-temperature resistant aerogel material as an integration of thermal management functions

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Journal of Energy Chemistry 2025年第1期100卷 157-170页

作者： Yueyue Xiao Tianke Mao Zun Zhao Yuelei Pan Heping Zhang Xudong Cheng State Key Laboratory of Fire Science University of Science and Technology of China

Thermal management system is highly desirable to guarantee the performance and thermal safety of lithium-ion batteries,but it reduces the energy density of battery modules and even is unable to provide highly effective ***,a thermal management function integrated material is presented based on high-temperature resistant aerogel and phase change material and is applied at both charge–discharge process and thermal runaway *** this sandwich structure Paraffin@SiC nanowire/Aerogel sheet （denoted as PA@SAS） system,SiC nanowires endow the middle aerogel sheet （SAS） a dual nano-network *** enhanced mechanical properties of SAS were studied by compressive tests and dynamic mechanical ***,the thermal conductivity of SAS at 600°C is only 0.042 W/（m K）.The surface phase change material layers facilitate temperature uniformity of batteries （surface temperature difference less than 1.82°C） through latent ***,a large-format battery module with four 58 Ah LiNi0.5Co0.2Mn0.3O2LIBs was ***@SAS successfully prevents thermal runaway propagation,yielding a temperature gap of 602°C through the 2 mm-thick cross ***@SAS also exhibits excellent performance in other safety issues such as temperature rise rate,flame heat flux,*** lightweight property and effective insulation performance achieves significant safety enhancement with mass and volume energy density reduction of only 0.79%and 5.4%,*** originality of the present research stems from the micro and macro structure design of the proposed thermal management material and the combination of intrinsic advantages of every *** work provides a reliable design of achieving the integration of thermal management functions into an aerogel composite and improves the thermal safety of lithium-ion batteries.

关键词： Thermal insulation

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Surface effect of nanocrystals doped with rare-earth ions enriched on surface and its application in upconversion luminescence

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Chinese Physics B 2012年第7期21卷 241-249页

作者：何恩节刘宁章毛连秦炎福官邦贵李勇郭明磊 Department of Physical and Electronics Anhui Science and Technology University

By employing a certain proportion of hydrogen peroxide, ammonia, ammonium fluoride, and ethylene diamine tetraacetic acid （EDTA） as precipitator, well-crystallized LaOF：Eu3＋ and LaOF：Yba＋, Era＋ nanocrystals are synthe- sized by using the chemical co-precipitation method. The structural properties of these samples are characterized by X-ray diffraction （XRD）, transmission electron microscopy （TEM）, and Fourier transform infrared spectroscopy （FTIR） spectra. The results show that all the samples have an average size below 70 nm, which decreases gradually with the increase of the EDTA content, and a certain number of EDTA molecules are coupled with doped ions on the surfaces of nanocrystals. Most of the doped ions are proved to be enriched on the surfaces of nanocrystals and surrounded by the high energy vibration groups and bonds in EDTA molecules. The observed differences in upconversion emission spectrum among the different LaOF：Yba＋, Er3＋ nanocrystals are explained by the different two-photon upconversion mechanisms. Especially, in the LaOF：Yba＋, Era＋ nanocrystals with EDTA, the two-photon processes that contain several special cross-relaxation processes are introduced to analyse the corresponding upconversion mechanisms.

关键词： surface effect nanocrystals cross relaxation

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Energy dissipation rate: An indicator of coal deformation and failure under static and dynamic compressive loads

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International Journal of Mining Science and technology 2018年第3期28卷 397-406页

作者： Feng Junjun Wang Enyuan Chen Xia Ding Houcheng Civil Engineering and Architecture Anhui University of Technology Key Laboratory of Gas and Fire Control for Coal Mines China University of Mining and Technology School of Mathematics and Physics Anhui University of Technology

Dynamic disasters in Chinese coal mines pose a significant threat to coal productivity. Thus, a thorough understanding of the deformation and failure processes of coal is necessary. In this study, the energy dissipation rate is proposed as a novel indicator of coal deformation and failure under static and dynamic compressive loads. The relationship between stress-strain, uniaxial compressive strength, displacement rate, loading rate, fractal dimension, and energy dissipation rate was investigated through experiments conducted using the MTS C60 tests(static loads) and split Hopkinson pressure bar system(dynamic loads). The results show that the energy dissipation rate peaks are associated with stress drop during coal deformation, and also positively related to the uniaxial compressive strength. A higher displacement rate of quasi-static loads leads to an initial increase and then a decrease in energy dissipation rate, whereas a higher loading rate of dynamic loads results in larger energy dissipation rate. Theoretical analysis indicates that a sudden increase in energy dissipation rate suggests partial fracture occurring within coal under both quasi-static and dynamic loads. Hence, the energy dissipation rate is an essential indicator of partial fracture and final failure within coal, as well as a prospective precursor for catastrophic failure in coal mine.

关键词： Energy dissipation Stress drop Split Hopkinson pressure bar (SHPB) Stress-strain Uniaxial compressive strength

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Size analysis of slag eye formed by gas blowing in ladle refining

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Journal of Iron and Steel Research International 2017年第3期24卷 243-250页

作者： Ning-ning Lv Liu-shun Wu Hai-chuan Wang Yuan-chi Dong Chang Su School of Metallurgical Engineering Anhui University of Technology Ma'anshan 243032 Anhui China Key Laboratory of Metallurgical Emission Reduction & Resources Recycling Ministry of Education Ma' anshan 243002 AnhuiChina

The formation of slag eye in a gas stirred ladle was studied through cold models and industrial trials. In the cold model,water and sodium tungstate solution were employed to simulate liquid steel,and silicon oil was employed to simulate slag. The simulation results revealed that the gas flow rate and bath height had strong effects on the slag eye size. In particular,the thickness of slag layer played a strong role in the slag eye size. In addition,the slag eye could not be formed when the thickness of the top layer was more than 4 cm in water-silicone oil ***,the section area of vessel had a great impact on the slag eye size. Industrial trials results showed a similar trend that the gas flow rate was very significant on the slag eye size. The predictions of the existing models showed larger predictions deviations compared with the experimental data. Moreover,a new model without fitting parameters was developed based on force balance and mathematical derivation,and verified by the experimental data. The new model provides the prediction with small deviations by comparing with the data acquired from cold models and industrial trials.

关键词： Slag eye Cold model Industrial trial Gas blowing Ladle refining

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Job shop scheduling problem based on DNA computing

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Journal of Systems Engineering and Electronics 2006年第3期17卷 654-659页

作者： Yin Zhixiang Cui Jianzhong Yang Yan Ma Ying Dept. of Mathematics and Physics Anhui Univ. of Science and Technology Huainan 232001 P.R. China

To solve job shop scheduling problem, a new approach-DNA computing is used in solving job shop scheduling problem. The approach using DNA computing to solve job shop scheduling is divided into three stands. Finally, optimum solutions are obtained by sequencing A small job shop scheduling problem is solved in DNA computing, and the ＂operations＂ of the computation were performed with standard protocols, as ligation, synthesis, electrophoresis etc. This work represents further evidence for the ability of DNA computing to solve NP-complete search problems.

关键词： DNA computing job shop scheduling problem weighted tournament.

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Explosion temperature mapping of emulsion explosives containing TiH_(2)powders with the two-color pyrometer technique

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Defence technology（防务技术） 2022年第10期18卷 1834-1841页

作者： Yu-Le Yao Yang-Fan Cheng Qi-Wei Zhang Yu Xia Fang-Fang Hu Quan Wang Yuan Chen State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines Anhui University of Science and TechnologyHuainan232001PR China School of Chemical Engineering Anhui University of Science and TechnologyHuainan232001PR China anhui Engineering Laboratory of Explosive Materials and technology Anhui University of Science and TechnologyHuainan232001PR China Quality Department The 38th Research Institute of China Electronics Technology Group CorporationHefei230088PR China

In the study,the two-color pyrometer technique was used to measure the transient temperature field of emulsion explosives with different contents of TiH_(2)*** experimental results showed that the introduction of TiH_(2)powders could significantly increase the explosion temperature and fireball duration of emulsion *** emulsion explosives were ignited,the average explosion temperature of pure emulsion explosive continuously decreased while emulsion explosives added with TiH_(2)powders increased at first and then *** the content of TiH_(2)powders was 6 mass%,the explosion average temperature reached its maximum value of 3095 K,increasing by 43.7%as compared with that of pure emulsion *** addition,the results of air blast experiment and explosion heat test showed that the variation trends of shock wave parameters,explosion heat and theoretical explosion temperature of emulsion explosives with different contents of TiH_(2)powders were basically consistent with that of explosion temperature measured by the two-color pyrometer *** conclusion,the two-color pyrometer technique would be conducive to the formula design of emulsion explosive by understanding the explosion temperature characteristics.

关键词： Two-color pyrometer Emulsion explosive Explosion temperature field Explosion heat

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A joint optimization algorithm for focused energy delivery in precision electronic warfare

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Defence technology（防务技术） 2022年第4期18卷 709-721页

作者： Zhong-ping Yang Shu-ning Yang Qing-song Zhou Jian-yun Zhang Zhi-hui Li Zhong-rui Huang College of Electronic Engineering National University of Defense TechnologyHe FeiChina

Focused energy delivery(FED) is a technique that can precisely bring energy to the specific region,which arouses wide attention in precision electronic warfare(PREW).This paper first proposes a joint optimization model with respect to the locations of the array and the transmitted signals to improve the performance of *** the problem is nonconvex and NP-hard,particle swarm optimization(PSO) is adopted to solve the locations of the array,while designing the transmitted signals under a feasible array is considered as a unimodular quadratic program(UQP) subproblem to calculate the fitness criterion of *** the PSO-UQP framework established,two methods are presented for the UQP subproblem,which are more efficient and more accurate respectively than previous ***,a threshold value is set in the framework to determine which method to adopt to take full advantages of the methods ***,we obtain the maximum localization error that FED can tolerate,which is significant for implementing FED in *** results are provided to demonstrate the effectiveness of the joint optimization algorithm,and the correctness of the maximum localization error derived.

关键词： Focused energy delivery Localization error Particle swarm optimization Precision electronic warfare Unimodular quadratic program

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Inerting characteristics of entrained atomized water on premixed methane-air flame

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International Journal of Mining Science and technology 2015年第6期25卷 997-1002页

作者： Cai Feng Wang Ping Zhou Jiebo Li Chao Key Laboratory of Mining Coal Safely and Efficiently Constructed by anhui Province and Ministry of Education Anhui Universigty of Science and Technology School of Resource and Safety Engineering Anhui University of Science and Technology State Key Laboratory of Fire Science China university of Science and technology Academy of Coal Methane Huainan Mining Industry (Group) Co.Ltd.

A combustion tube experiment platform was designed and used to study the inerting conditions and capacity of entrained atomized water on premixed methane–air flame. The structure of a laminar flame of premixed methane–air gas and the process of interaction between atomized water and flame was recorded, and the rules of combustion velocity, stability and strength rate of laminar flame were experimentally studied. The inerting process and mechanism was analyzed, and the characteristics of inerting premixed methane–air gas within explosion limits by atomized water were acquired. The research results show that: for the premixed methane–air gas with a concentration of 7%, the minimum inerting atomized water flux is 20.8 m L/(m2min); for the premixed methane–air gas with a concentration of 9%, the minimum inerting atomized water flux is 32.9 m L/(m2min); for the premixed methane–air gas with a concentration of 11%, the minimum inerting atomized water flux is 44.6 m L/(m2min). The research results are significant for extinguishing methane flame and inhibiting of methane explosion using atomized water.

关键词： Atomized water Methane-air gas Premixed methane-air flame lnertion

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Modification mechanism of caking and coking properties of Shenmu subbituminous coal by low-temperature rapid pyrolysis treatment

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Journal of Iron and Steel Research International 2019年第10期26卷 1052-1060页

作者： Xiang-chun Liu Bin Fang Zhi-gang Zhao Rui-lun Xie Zhao Lei Qiang Ling Ping Cui anhui Key Laboratory of Coal Clean Conversion&Utilization School of Chemistry and Chemical EngineeringAnhui University of TechnologyMa'anshan 243032AnhuiChina

Shenmu(SM)subbituminous coal without caking property was treated by low-temperature rapid pyrolysis(LTRP)to modify its caking and coking *** treated samples were characterized by Fourier transform infrared spectrometry,vitrinite reflectance,and X-ray diffraction to determine the modification ***,caking index(G)and coking indices(mechanical strength,coke reactivity,and coke strength after reaction)were employed to evaluate caking and coking properties,*** results showed that SM coal was gradually upgraded with increasing processing ***,the G values for the treated samples were significantly higher than that for SM coal,and G reached the maximum value at 450℃,implying the modification of caking property and the existence of an optimum temperature(450℃).Additionally,laboratory coking determinations showed that LTRP increased the mechanical strength of coke and coke strength after reaction and decreased coke reactivity when the treated coals were used in the coal blends instead of raw SM ***,LTRP treatment is effective to improve the caking and coking properties of SM coal.A mechanism was proposed for the *** upgrading degree with suitable molecular masses and some releasable hydrogen-rich donor species present within the coal,which dominate the development of caking property,is important.

关键词： Caking property Coking property Non-caking coal Low-temperature rapid pyrolysis Subbituminous coal

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Dynamic crushingof cellular materials: a particle velocity-based analytical method and its application

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Acta Mechanica Sinica 2019年第4期35卷 839-851页

作者： Shilong Wang Zhijun Zheng Yuanyuan Ding Changfeng Zhu Jilin Yu School of Civil Engineering Anhui University of Technology Ma'anshan 243032 China CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern Mechanics University of Science and Technology of China Hefei230026 China Mechanics and Materials Science Research Center Ningbo University Ningbo 315211 China

Cellular material under high-velocity impacthas a typical feature oflayer-wise collapse.A cell-based finite element model is employed to simulate the direct impact of closed-cell foam, and one-dimensional velocity field distributionsareobtained to characterize thecrushing bandpropagating through a cellular material. An explicit expression of continuous velocity distribution is derivedbased on the features of velocity gradient distribution. The velocity distribution function is adopted to determine the dynamic stress-strain statesof cellular materials under dynamic *** local stress-strain history distribution reveals that sectional cells experience a process from the precursor of elastic behavior to the shock stress state, through the dynamic initial crushing state. A power-law relation between the dynamic initial crushing stress andthe strainrate isestablished, which confirms the strain-rate effect of cellular materials. By extracting the critical points immediately before the unloading stage on the local dynamic stress-strain history curves, the dynamic stress-strain statesof cellular materials are determined. They exhibit loading rate-dependence but are independent of the initial impact ***, with the increase of relative density, the dynamic hardening behaviorof cellular specimen is enhanced and the crushing process event is advanced. The particle velocity-based analytical method is appliedto analyze the dynamic responses of cellular *** method is better than continuum-based shock models, since itdoes not require a pre-assumed constitutive ***,the particle velocity-based analytical method proposed in this study may provide new ideas to carry out dynamic experimental measurement, which is especially applicable toinhomogeneous materials.

关键词： Cellular material Velocity distribution Dynamic behavior Strain-rate effect Dynamic stress-strain state

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