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Thermal decomposition kinetics and mechanism investigation of cumene hydroperoxide under inert gas: A novel experimental method

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Process Safety and Environmental Protection 2023年 172卷 408-416页

作者： Yu, Chang-Fei Liu, Shang-Hao Yuan, Liang Wei, Dan-Dan Key Laboratory of Industrial Dust Control and Occupational Health Ministry of Education Anhui University of Science and Technology 168 Taifeng Street HuainanAnhui232001 China Department of Chemical and Materials Engineering National Yunlin University Science and Technology 123 University Rd. Sec. 3 DouliouYunlin64002 Taiwan State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines Anhui University of Science and Technology 168 Taifeng Street HuainanAnhui232001 China Coal Mining National Engineering Technology Research Institute 168 Taifeng Street HuainanAnhui232001 China School of Safety Science and Engineering Anhui University of Science and Technology 168 Taifeng Street HuainanAnhui232001 China

Organic peroxides, due to temperature manipulation failure and/or manner disturbances, had been probable to lead to the prevalence of runaway phenomena, even fire, and explosion. Cumene hydroperoxide (CHP), is a traditional liquid organic peroxide for industrial purposes and is applied as a free radical initiator for polymerization reactions in the petrochemical industry. Its utilization in the industrial processes had certain potential safety hazards. In this work, linearly ramped thermal decomposition in CHP was performed using differential scanning calorimetry under a nitrogen atmosphere. Kinetic analysis is made using data from the ramped measurements with two integral strategies (Flynn-Wall-Ozawa and Kissinger-Akahira-Sunose). The gaseous products of thermal decomposition in CHP are investigated via thermal gravimetric evaluation coupled with Fourier transform infrared spectroscopy and gas chromatography/mass spectrometry. Combined with the experimental results, the possible decomposition path of CHP is discussed. This makes up the gap of unclear decomposition mechanism of CHP in inert atmosphere, and has important reference significance for its industrial production and application. © 2023

关键词： Thermolysis

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Thermal reaction characterization of nano-aluminum powder at different heating rates by synchronous thermal analysis

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Journal of Thermal Analysis and Calorimetry 2023年第11期148卷 4937-4947页

作者： Qu, Jiao Deng, Jun Luo, Zhen-Min Xiao, Yang Shu, Chi-Min School of Safety Science and Engineering Xi’an University of Science and Technology No. 58 Yanta Mid. Rd. Shaanxi Xi’an710054 China Postdoctoral Program Xi’an University of Science and Technology No. 58Yanta Mid. Rd. Shaanxi Xi’an710054 China Shaanxi Key Laboratory of Prevention and Control of Coal Fire No. 58 Yanta Mid. Rd. Shaanxi Xi’an710054 China Graduate School of Engineering Science and Technology National Yunlin University of Science & Technology 123 University Rd. Sec. 3 Yunlin Douliou64002 Taiwan

This article reports an investigation on the thermal reactivity of nano-aluminum powder (NAP) in the air. We performed tests on the metallic powder in synchronous thermal analysis at four heating rates of 5, 10, 15, and 20 °C min−1. Given the polymorphic phase change of aluminum, the oxidation process of NAP was divided into four stages. The results showed a notable effect from the heating rate on the oxidation of NAP. The mass gain decreased at stage II and increased at stage IV as the rate of heating increased. The maximum mass gain rate at 5, 10, 15, and 20 °C min−1 was 2.38, 4.70, 33.79, and 53.38% min−1, respectively, while the thermal release was 35,126, 27,955, 15,608, and 16,336 J g−1, respectively. Furthermore, the average apparent activation energy, preexponential factor, and mechanism function were obtained by the kinetic integral method. © 2023, Akadémiai Kiadó, Budapest, Hungary.

关键词： Heating rate

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An intelligent target detection method of UAV swarms based on improved KM algorithm

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Chinese Journal of Aeronautics 2021年第2期34卷 539-553页

作者： Xiangming ZHENG Chunyao MA Key Laboratory of Fundamental Science for National Defense Design Technology of Flight Vehicle Nanjing University of Aeronautics and AstronauticsNanjing 210016China

Complete and efficient detection of unknown targets is the most popular application of UAV swarms. Under most situations, targets have directional characteristics so that they can only be successfully detected within specific angles. In such cases, how to coordinate UAVs and allocate optimal paths for them to efficiently detect all the targets is the primary issue to be solved. In this paper, an intelligent target detection method is proposed for UAV swarms to achieve real-time detection requirements. First, a target-feature-information-based disintegration method is built up to divide the search space into a set of cubes. Theoretically, when the cubes are traversed, all the targets can be detected. Then, a Kuhn-Munkres(KM)-algorithm-based path planning method is proposed for UAVs to traverse the cubes. Finally, to further improve search efficiency, a 3 D realtime probability map is established over the search space which estimates the possibility of detecting new targets at each point. This map is adopted to modify the weights in KM algorithm, thereby optimizing the UAVs’ paths during the search process. Simulation results show that with the proposed method, all targets, with detection angle limitations, can be found by UAVs. Moreover, by implementing the 3 D probability map, the search efficiency is improved by 23.4%–78.1%.

关键词： 3D probability map Kuhn-Munkres algorithm Path planning Real-time control Swarm intelligence Target detection Unmanned aerial vehicle(UAV)

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How to Measure the Effect of Training-Data Sample Size on Image Classification Algorithms Based on Deep Learning

How to Measure the Effect of Training-Data Sample Size on...

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International Conference on Guidance, Navigation and control, ICGNC 2024

作者： He, Jun Fu, Ruigang Wang, Guoyan Lu, Dawei National Key Laboratory of Automatic Target Recognition College of Electronic Science and Technology National University of Defense Technology Changsha China

ISBN: (纸本)9789819622313

Since the performance of image classification algorithm based on deep learning is closely related to its network complexity and the training data, we propose a new experimental method to measure the effectiveness of training data sample size. An image classification algorithm is regarded as a decision making units with network parameters input and classification accuracy output according to a certain dataset. This new method, which measures the algorithm’s efficiency, is quite different with those traditional performance modeling approaches. With the help of data envelope analysis theory and Malmquist index, this new method can deal various evaluation metrics naturally. In order to avoid complex performance modeling, the variable scale to return model is chosen to calculate the adjacent-period distance which reflects the effect of training data. Then the distance function is decomposed into the technical change and the efficiency change. The former measures the effect of training data on those Pareto optimal algorithms, while the later gives each algorithm’s efficiency of data using. At last, a traffic light image classification example shows that the proposed method is flexible and convenient. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.

关键词： Deep learning

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Multi-scale Optical Flow Estimation for Video Infrared Small Target Detection 2

Multi-scale Optical Flow Estimation for Video Infrared Small...

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2nd International Conference on Computer science, Electronic Information Engineering and Intelligent control technology, CEI 2022

作者： Luo, Yihang Ying, Xinyi Li, Ruojing Wan, Yujun Hu, Bo Ling, Qiang College of Electronic Science and Technology National University of Defense Technology Changsha China State Key Laboratory of Astronautic Dynamics Xian China

ISBN: (数字)9781665476164

ISBN: (纸本)9781665476164

The spatio-temporal information among video sequences is significant for video infrared (IR) small target detection. To effectively utilize the supplementary temporal information, existing video IR small target detection methods usually use optical flow to perform motion estimation and compensation. The common optical flow-based detection methods can only capture small motion of video sequences. However, the slow IR imaging speed and wide viewing distance resulting the spatial location of the target between two frames is frequently different, which limits the efficacy of optical flow-based detection methods. To solve the problem, we propose an end-to-end video infrared small target detection method, which is more robust to large motion and can achieve more accurate motion compensation. Specifically, we first propose a multi-scale optical flow reconstruction network to perform motion estimation in a coarse-to-fine manner. Then, the generated optical flows are used to align the neighborhood frames to the reference frame. Finally, the aligned neighborhood frames are concatenated and fed to the detection network to generate detection results. Experimental results demonstrate that the proposed reconstruction network provides more accurate motion estimation and can achieve improved performance on both detection accuracy and temporal consistency. Comparative results on the infrared video datasets show that our framework achieves the state-of-the-art performance. © 2022 IEEE.

关键词： Optical flows

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Thermometry of trapped ions based on bichromatic driving

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Physical Review Applied 2024年第6期22卷 064022-064022页

作者： Xie-Qian Li Yi Tao Ting Chen Wei Wu Yi Xie Chun-Wang Wu Ping-Xing Chen Institute for Quantum Science and Technology National University of Defense Technology Changsha 410073 Hunan China Hunan Key Laboratory of Mechanism and Technology of Quantum Information Changsha 410073 Hunan China

Accurate thermometry of laser-cooled ions is crucial for the performance of the trapped-ion quantum computing platform. However, most existing methods face a computational exponential bottleneck. Recently, a thermometry method based on bichromatic driving was theoretically proposed by Vybornyi et al. [PRX Quantum 4, 040346 (2023)] to overcome this obstacle, which allows the computational complexity to remain constant with the increase of ion numbers. In this paper, we provide a detailed statistical analysis of this method and prove its robustness regarding several imperfect experimental conditions using Floquet theory. We then experimentally verify its good performance on a linear-segmented-surface-electrode-ion-trap platform. This method is proven to be effective from near the motional ground state to a few mean phonon numbers. Our theoretical analysis and experimental verification demonstrate that the scheme can accurately and efficiently measure the temperature in ion crystals.

关键词： Quantum computation Quantum control Quantum metrology Quantum parameter estimation Trapped ions Thermometry

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Comprehensive investigation of two environmentally-friendly imidazolium nitrate ionic liquids: from calorimetry to thermal risk evaluation

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Journal of Thermal Analysis and Calorimetry 2023年第11期148卷 4913-4925页

作者： Liu, Shang-Hao Yu, Chang-Fei Wu, Ke-Fan Chen, Chan-Cheng School of Chemical Engineering Anhui University of Science and Technology Anhui Huainan232001 China State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines Anhui University of Science and Technology Anhui Huainan232001 China Department of Safety Health and Environmental Engineering National Kaohsiung University of Science and Technology Kaohsiung824 Taiwan

Due to their low volatility, ionic liquids (ILs) are widely used in many industries. However, some ILs are reported to be explosive under unstable conditions in the literature, and therefore a comprehensive assessment of the fire safety risks should be conducted before industrial applications. This study aims to investigate the thermal stability of two environmentally friendly used ILs (1-butyl-3-methylimidazolium nitrate ([C4mim]NO3) and 1-butyl-2,3-dimethylimidazolium nitrate ([C4mmim]NO3) using simultaneous thermogravimetric analyzer, differential scanning calorimetry, accelerating rate calorimeter, and thermogravimetry coupled to Fourier transform infrared spectroscopy. Based on the results of dynamic and isothermal thermogravimetric experiments, [C4mmim]NO3 shows higher thermal stability compared with [C4mim]NO3, indicating that the methyl substitution at the imidazolium C2 has a positive effect on the thermal stability of imidazolium nitrate. Additionally, the increased methyl substitution leads to more significant thermal decomposition of [C4mmim]NO3 and enhanced gas production under adiabatic conditions, which means that the potential thermal hazards are increased. Furthermore, [C4mim]NO3 and [C4mmim]NO3 may have different thermal decomposition pathways because the possible thermal decomposition products are not identical. The produced flammable gases also indicate that the operating temperatures of [C4mim]NO3 and [C4mmim]NO3 must be strictly controlled to prevent the occurrence of accidents. © 2022, Akadémiai Kiadó, Budapest, Hungary.

关键词： Nitrates

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Metamaterial-inspired infrared electrochromic devices with wideband microwave absorption for multispectral camouflage

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Photonics Research 2024年第11期12卷 2435-2446页

作者： ZHEN MENG DONGQING LIU JIAFU WANG YONGQIANG PANG TIANWEN LIU YAN JIA BOHENG GUI HAIFENG CHENG Science and Technology on Advanced Ceramic Fibers and Composites Laboratory College of Aerospace Science and EngineeringNational University of Defense TechnologyChangsha 410073China Shaanxi Key Laboratory of Artificially-Structured Functional Materials and Devices Air Force Engineering UniversityXi’an 710051China Electronic Materials Research Laboratory Key Laboratory of the Ministry of EducationXi’an Jiaotong UniversityXi’an 710049China

Infrared(IR)electrochromic devices,capable of dynamically controlling thermal radiation,hold promising applications in adaptive ***,the strong microwave reflective properties inherent in the device’s electrodes present a significant challenge,rendering them susceptible to radar detection and weakening their camouflage *** by the remarkable electromagnetic control capabilities of metamaterials,the integration of frequency selective surfaces into IR electrochromic devices is proposed to address this multispectral compatibility *** designed integrated metadevices simultaneously exhibit large and reversible IR emissivity tunability(Δε≥0.55 at 3–5μm,Δε≥0.5 at 7.5–13μm)and wideband microwave absorption(reflection loss≤-10 dB at 8.5–18 GHz).Furthermore,the monolithic integrated design of the shared barium fluoride substrate offers a simple device architecture,while careful design considerations mitigate coupling between IR electrochromism and microwave wideband *** work introduces opportunities for the development of multispectral adaptive camouflage systems,offering potential advancements in concealment technology.

关键词： microwave absorption spectral

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Designing of multifunctional and flame retardant separator towards safer high-performance lithium-sulfur batteries

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Nano Research 2021年第12期14卷 4865-4877页

作者： Junling Wang Wei Cai Xiaowei Mu Longfei Han Na Wu Can Liao Yongchun Kan Yuan Hu State Key Laboratory of Fire Science CAS Key Laboratory of Soft Matter ChemistryUniversity of Science and Technology of ChinaHefei230026China Jiangsu Key Laboratory of Hazardous Chemicals Safety and Control College of Safety Science and EngineeringNanjing Tech UniversityNanjing211816China

Owing to unprecedented merits such as high theoretical capacity,superior energy density and low cost,lithium-sulfur batteries(LSBs)show a bright future both in scientific and industrial ***,the inherent issues,including highly insulating character,undesired shuttle behavior and lithium dendrites growth,are seriously impeding its practical ***,a metal-organic-frameworks(MOFs)derived N,S co-doped carbon nanotube hollow architecture confining with CoS_(2) nanoparticles(CoS_(2)/NSCNHF)modified separator is designed to surmount these *** with Celgard separator,this designed separator shows obviously enhanced flame retardancy,giving 73.1%and 53.0%reductions in peak heat release rate and total heat release,***,its hollow structure,conductive feature,electrocatalytic activity and Lewis acid-base interaction enable the efficient inhibition on shuttle behavior as well as boost in polysulfides conversion *** cell with modified separator delivers a high discharge capacity of 1,284.5 mAh·g^(−1).After running for 100 cycles,a discharge capacity of 661.3 mAh·g^(−1) is ***,the suppression on lithium dendrites growth is also observed,manifesting the enhanced battery ***,this work may shed light on the effective usage of MOFs-derived hierarchical composite in achieving LSBs with high electrochemical performance as well as safety.

关键词： metal-organic-frameworks shuttle behavior lithium dendrites flame retardancy

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A credibility allocation approach of complex simulation systems 35

A credibility allocation approach of complex simulation syst...

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35th European Modeling and Simulation Symposium, EMSS 2023

作者： Zhang, Huan Li, Wei Geng, HuaPin Ma, Ping Yang, Ming Control and Simulation Center Harbin Institute of Technology Harbin150080 China National Key Laboratory of Modeling and Simulation for Complex Systems Harbin150080 China Science and Technology on Complex System Control and Intelligent Agent Cooperation Laboratory Beijing100074 China

ISBN: (纸本)9788885741881

Complex simulation systems usually need to satisfy the credibility requirements and the credibility of complex simulation systems is inextricably linked to the credibility of simulation sub-systems. Hence, in order to guarantee the credibility of complex simulation systems meets requirements, it is necessary to allocate the credibility of simulation sub-systems. Complex simulation systems are composed of several correlative simulation sub-systems and their credibility has correlation relationships, which makes it difficult to obtain the credibility of simulation sub-systems quickly. The existing works mostly ignore the relationships between the sub-systems and are difficult to generate the credibility allocation results of simulation sub-systems. In this paper, we model the credibility allocation problem as a probabilistic inference problem based on the pairwise Markov random field (PMRF). In addition, we apply several inference algorithms to perform the inference exactly and approximately in the credibility PMRF. Finally, experiments are conduted on the air defense combat complex simulation system, and the experiment results demonstrate that the proposed method can obtain the credibility allocation results quickly and accurately. © 2023 The Authors.

关键词： Inference engines

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