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2022 3rd International Conference on Mechanical Engineering and Materials, ICMEM 2022

作者： Sun, Zhi Yu, Yuanyuan Mei, Yiying Xiao, Xunqiao Shi, Zicang Key Laboratory of Civil Aviation Emergency Science and Technology CAAC Nanjing University of Aeronautics and Astronautics Nanjing211106 China Key Laboratory of Aircraft Environment Control and Life Support MIIT Nanjing University of Aeronautics and Astronautics Nanjing210016 China

With the development of marine-related industries, the number of tasks at sea has increased, and accidents there happen more frequently as well. Search and rescue are very challenging because of the extreme wind and wave environment at sea. Therefore, the state has been paying more attention to maritime emergency rescue. One part is emergency rescue path planning, which is crucial for helicopter emergency rescue at sea. In this paper, a series of multi-target rescue path solutions are created in order to solve the challenge of multi-target rescue path planning while taking into account sea wind and waves. The rescued targets' floating trajectory model is first established. Then, a recursive algorithm based on a permutation tree is given in response to the unsteady change of the targets' position at sea. The rescue path is planned with the goal of cutting down on the helicopter's search time. Finally, using the multi-target rescue in China's Taiwan Strait as an example, it is discovered that the overall time needed for the multi-target rescue is decreased by 7.03 minutes, and the efficiency of the rescue is improved by 13.3% in the wind and wave environment at sea. According to the research, the optimal rescue path shortens the time required for multi-target rescue at sea while increasing the effectiveness of helicopter rescue operations. © Published under licence by IOP Publishing Ltd.

关键词： Motion planning

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Multi-functional layered double hydroxides supported by nanoporous gold toward overall hydrazine splitting

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Frontiers of Chemical science and Engineering 2024年第1期18卷 61-69页

作者： Yongji Qin Huijie Cao Qian Liu Shaoqing Yang Xincai Feng Hao Wang Meiling Lian Dongxing Zhang Hua Wang Jun Luo Xijun Liu ShenSi Lab Shenzhen Institute for Advanced StudyUniversity of Electronic Science and Technology of ChinaShenzhen 518110China Institute for New Energy Materials and Low-Carbon Technologies School of Materials Science and EngineeringTianjin University of TechnologyTianjin 300384China State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured MaterialsSchool of ResourcesEnvironment and MaterialsGuangxi UniversityNanning 530004China Institute for Advanced Study Chengdu UniversityChengdu 610106China China National Coal Group Corporation Beijing 100120China Tianjin Engineering Research Center of Civil Aviation Energy Environment and Green Development School of Transportation Science and EngineeringCivil Aviation University of ChinaTianjin 300300China

Layered double hydroxides have demonstrated great potential for the oxygen evolution reaction,which is a crucial half-reaction of overall water ***,it remains challenging to apply layered double hydroxides in other electrochemical reactions with high efficiency and ***,we report two-dimensional multifunctional layered double hydroxides derived from metalorganic framework sheet precursors supported by nanoporous gold with high porosity,which exhibit appealing performances toward oxygen/hydrogen evolution reactions,hydrazine oxidation reaction,and overall hydrazine *** as-prepared catalyst only requires an overpotential of 233 mV to reach 10 mA·cm^(-2) toward oxygen evolution *** overall hydrazine splitting cell only needs a cell voltage of 0.984 V to deliver 10 mA·cm^(-2),which is far more superior than that of the overall water splitting system(1.849 V).The appealing performances of the catalyst can be contributed to the synergistic effect between the metal components of the layered double hydroxides and the supporting effect of the nanoporous gold substrate,which could endow the sample with high surface area and excellent conductivity,resulting in superior activity and stability.

关键词： layered double hydroxide oxygen evolution reaction hydrazine oxidation reaction overall hydrazine splitting hydrogen production

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EPIMR:Prediction of Enhancer-Promoter Interactions by Multi-Scale ResNet on Image Representation

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Big Data Mining and Analytics 2024年第3期7卷 668-681页

作者： Qiaozhen Meng Yinuo Lyu Xiaoqing Peng Junhai Xu Jijun Tang Fei Guo School of Computer Science and Technology College of Intelligence and ComputingTianjin UniversityTianjin 300350China Aeronautical Information Service Center of the Civil Aviation Administration of China(AISC.ATMB.CAAC) Beijing 100015China Center for Medical Genetics&Hunan Key Laboratory of Medical Genetics School of Life SciencesCentral South UniversityChangsha 410038China Shenzhen Institute of Advanced Technology Chinese Academy of SciencesShenzhen 518000China School of Computer Science and Engineering Central South UniversityChangsha 410083China

Prediction of enhancer-promoter interactions(EPIs)is key to regulating gene expression and diagnosing genetic *** to limited resolution,biological experiments perform not as well as expected while precisely identifying specific interactions,giving rise to computational biology *** EPI predictors have been developed,but their prediction accuracy still needs to be ***,we design a new model named EPIMR to identify enhancer-promoter ***,Hilbert Curve is utilized to represent sequences to images to preserve the position and spatial ***,a multi-scale residual neural network(ResNet)is used to learn the distinguishing features of different abstraction ***,matching heuristics are adopted to concatenate the learned features of enhancers and promoters,which pays attention to their potential interaction *** results on six cell lines indicate that EPIMR performs better than existing methods,with higher area under the precision-recall curve(AUPR)and area under the receiver operating characteristic(AUROC)results on benchmark and under-sampling ***,our model is pre-trained on all cell lines,which improves not only the transferability of cross-cell line prediction,but also cell line-specific prediction *** conclusion,our method serves as a valuable technical tool for predicting enhancer-promoter interactions,contributing to the understanding of gene transcription *** code and results are available at https://***/guofei-tju/EPIMR.

关键词： enhancer-promoter interactions Hilbert Curve multi-scale residual neural network(ResNet)

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NUMERICAL SIMULATION AND EXPERIMENTAL RESEARCH OF SHEAR-DRIVEN WATER FILM ON FLAT PLATE

NUMERICAL SIMULATION AND EXPERIMENTAL RESEARCH OF SHEAR-DRIV...

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2024 CSAA/IET International Conference on Aircraft Utility Systems, AUS 2024

作者： Li, Qinyang Guan, Ning Ning, Bo Zhu, Guangya Zhang, Dalin Chen, Weijian Key Laboratory of Aircraft Environment Control and Life Support MIIT Nanjing University of Aeronautics and Astronautics Nanjing China College of Aeronautics Shandong Jiaotong University Changqing University Science and Technology Park No.5001 Haitang Road Jinan China Utility System Design and Research Department Jiangxi Hongdu Aviation Industry Group Company Ltd. Nanchang China

The supercooled water droplets in the air will form a water film on the aircraft during flight, which will then form icing, which will have an impact on the aerodynamic performance of the aircraft and even endanger the flight safety. In this paper, based on the Eulerian Wall Films model, the partial wetting effect is introduced, and the water film flow on flat plates driven by airflow shear force is investigated. The flow behaviours of water film with different contact angles under different flow rates were explored through water film test. The effectiveness of the calculation method for water film flow characteristics in this paper was verified by comparison between numerical simulation and test records, which laid a foundation for the anti-icing calculation in subsequent studies. © The Institution of Engineering & technology 2024.

关键词： Shear flow

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Effects of Heat Treatment Cooling Methods on Precipitated Phase and Mechanical Properties of Cocrfemnni-Mo5c0.5 High Entropy Alloy

SSRN

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SSRN 2023年

作者： Yao, Xiaofei Wang, Weihua Qi, Xiaoling Lv, Yukun Yang, Wei Li, Tianye Chen, Jian School of Materials Science and Chemical Engineering Xi’an Technological University Shaanxi Xi’an710021 China Aviation Key Laboratory of Science and Technology on Life-support Technology Hubei Xiangyang441003 China

CoCrFeMnNi-Mo5C0.5 high entropy alloys were prepared by vacuum arc melting, and then which heat treatment were carried out by water cooling, air cooling and furnace cooling respectively. the microstructure and phase composition of as-cast and heat treated CoCrFeMnNi-Mo5C0.5 high entropy alloys were examined by SEM, EDS and XRD, the mechanical properties of as-cast and heat treated CoCrFeMnNi-Mo5C0.5 high entropy alloys were tested by the tensile test and hardness test, and the effects of heat treatment cooling methods on precipitated phase and mechanical properties of CoCrFeMnNi-Mo5C0.5 high entropy alloys were investigated. The results show that precipitated phase in CoCrFeMnNi-Mo5C0.5 high entropy alloys is MC phase, which are riches in Mo, Cr and C. With change of heat treatment cooling methods from furnace cooling, air cooling to water cooling respectively, the heat treatment cooling rate is increased, the amount and size of precipitated phase are all decreases, and the position of precipitated phase change from grain boundary to intragranular. The tensile strength and elongation of heat treatment water cooled CoCrFeMnNi-Mo5C0.5 high entropy alloys are 739MPa and 41% respectively, which are realizes the simultaneous increase of strength and plasticity. With increase of heat treatment cooling rate, the hardness of CoCrFeMnNi-Mo5C0.5 high entropy alloys decrease, the elongation increase, the plastic deformation occurs mainly in the uniform plastic deformation stage. The fracture mode of as-cast CoCrFeMnNi-Mo5C0.5 high entropy alloy is intergranular fracture, the fracture mode of heat treatment furnace cooled, air cooled and water cooled CoCrFeMnNi-Mo5C0.5 high entropy alloys are all transgranular fracture. © 2023, The Authors. All rights reserved.

关键词： Iron alloys

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Simulation research on the performance of ejecting inflation system of emergency evacuation slide

Simulation research on the performance of ejecting inflation...

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CSAA/IET International Conference on Aircraft Utility Systems (AUS 2024)

作者： Lou Jin Qilong Liu Liang Wu Overall Technology R&D Department AVIC Aerospace Life-support Industries Ltd. Xianyang 441000 People's Republic of China Emergency Rescue Technology R&D Department AVIC Aerospace Life-support Industries Ltd. Xianyang 441000 People's Republic of China Aviation Key Laboratory of Science and Technology on Life-support Technology Xianyang 441000 People's Republic of China

ISBN: (数字)9781837242108

In this article, the CFD method is used to analyse the performance of the ejecting inflation system of the emergency evacuation slide. The simulation model is established according to the operating principle of the ejecting inflation system. Quantitative analysis of the applicability and accuracy of simulation models in the performance simulation of the ejecting inflation system is carried out, and the effects of different ejection pressures and ejection working fluid components on the system performance are simulated. The research results show that the Realizable k-e model has the smallest simulation deviation, and the ejection flow rate and ejection ratio are within 5% of the experimental value, which meets the requirements of engineering development; increasing ejection pressure is beneficial to increase the ejection flow rate and speed up the inflation of the slide, but the ejection ratio will decrease when the ejection pressure pass 3.75MPa, which is not conducive to reducing the weight of the system; increasing the N2 content in the ejection gas source is beneficial to increase the ejection ratio and reduce the weight of the system while ensuring the inflation performance. The research results of this article can provide a theoretical basis for the determination of the design index of the ejecting inflation system of the emergency evacuation slide.

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水幕冷却及红外遮蔽效应试验研究（英文）

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Journal of Marine science and Application 2025年第3期 567-579页

作者：袁能霖刘梅楠邹燚涛施红 School of Energy and Power Jiangsu University of Science and Technology Key Laboratory of Aircraft Environment Control and Life Support Nanjing University of Aeronautics & Astronautics School of Energy a nd Power Jiangsu University of Science and Technology

The water curtain spray system of the ship helps reduce surface thermal load and lowers thermal infrared radiation, notably enhancing the stealth and survivability of naval ships. The performance of the water curtain spray system is largely influenced by the density of the nozzles and their installation height. Therefore, a test platform was established to investigate these critical influencing factors, employing an orthogonal design methodology for the experimental study. Specifically, the study evaluated the effects of varying distances to the steel plate target and different injection heights on the cooling performance of the system. Results demonstrate that using one nozzle per 4 square meters of the ship's surface area effectively lowers the surface temperature, bringing it closer to the ambient background temperature. This nozzle configuration creates irregular infrared heat patterns, which complicate the task for infrared detectors to discern the ship's outline, thus enhancing its infrared stealth. Additionally, maintaining the nozzle installation height within 0.6 m to prevent the temperature difference between the steel plate and the background temperature from exceeding 4 K. Moreover, as the infrared imaging distance increases from 3 to 9 m, the temperature difference measured by the thermocouple and the infrared imager increases by 141.27%. Furthermore, with the increase in infrared imaging distance, the infrared temperature of the target steel plate approaches the background temperature, indicating improved detectability. These findings have significantly enhanced the stealth capabilities of naval ships, maximizing their immunity to infrared-guided weapon attacks. Moreover, their importance in improving the survivability of ships on the water surface cannot be underestimated.

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Scalable parallel evolutionary optimization on high performance computing

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Aerospace Traffic and Safety 2024年第2期1卷 93-102页

作者： Chen Jin Daren Zheng Shuke He Ao Cheng Gang Liu Key Laboratory of Civil Aviation Emergency Science&Technology CAACNanjing University of Aeronautics and AstronauticsNanjingChina Zhejiang Scientific Research Institute of Transport HangzhouChina School of Computer Science and Information Technology RMIT UniversityMelbourneAustralia Key Laboratory of Aircraft Environment Control and Life Support MIITNanjing University of Aeronautics and AstronauticsNanjingChina Zhejiang Jiande Institute of General Aviation HangzhouChina Zhejiang ATM Sub-Bureau.CAAC HangzhouChina

To improve the efficiency of evolutionary algorithms(EAs)for solving complex problems with large populations,this paper proposes a scalable parallel evolution optimization(SPEO)framework with an elastic asynchronous migration(EAM)*** addresses two main challenges that arise in large-scale parallel EAs:(1)heavy communication workload from extensive information exchange across numerous processors,which reduces computational efficiency,and(2)loss of population diversity due to similar solutions generated and shared by many *** EAM mechanism introduces a self-adaptive communication scheme to mitigate communication overhead,while a diversity-preserving buffer helps maintain diversity by filtering similar *** results on eight CEC2014 benchmark functions using up to 512 CPU cores on the Australian National Computational Infrastructure(NCI)platform demonstrate that SPEO not only scales efficiently with an increasing number of processors but also achieves improved solution quality compared to state-of-the-art island-based EAs.

关键词： Parallel evolutionary algorithm High performance computing(HPC) Computational efficiency Asynchronous migration

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Non-radical activation of persulfate with Bi_(2)O_(3)/BiO_(1.3)I_(0.4)for efficient degradation of propranolol under visible light

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Journal of Environmental sciences 2024年第8期142卷 57-68页

作者： Yuehua Deng Qianqian Che Yani Li Jiating Luo Xiang Gao Yan He Yiling Liu Tong Liu Xiaolong Zhao Xiaobin Hu Wei Zhao College of Geology and Environment Xi’an University of Science and TechnologyXi’an 710054China Shaanxi Provincial Key Laboratory of Geological Support for Coal Green Exploitation Xi’an 710054China Department of Mechanical Engineering The University of Hong KongHong Kong 999077China School of Life Science Huzhou UniversityHuzhou 313000China School of Materials Engineering Changshu Institute of TechnologyChangshu 215500China

Non-radical activation of persulfate(PS)by photocatalysts is an effective approach for removing organic pollutants from aqueous *** this study,a novel Bi_(2)O_(3)/BiO_(1.3)I_(0.4)heterojunction was synthesized using a facile solvothermal approach and used for the first time for non-radical activation of PS to degrade propranolol(PRO)in the presence of visible *** findings found that the degradation rate of PRO in the Bi_(2)O_(3)/BiO_(1.3)I_(0.4)/PS system was significantly increased from 19%to more than 90%within 90 min compared to the Bi_(2)O_(3)/BiO_(1.3)I_(0.4)*** indicated that the composite system exerted an excellent synergistic effect between the photocatalyst and the persulfate-based *** tests and electron paramagnetic resonance demonstrated that the non-radical pathway with singlet oxygen as the active species played a major role in the photocatalytic *** existence of photo-generated holes during the reaction could also be directly involved in the oxidation of ***,a possible PRO degradation pathway was also ***,the impacts of pH,humic acid and common anions on the PRO degradation by the Bi_(2)O_(3)/BiO_(1.3)I_(0.4)/PS were explored,and the system’s stability and reusability were also *** study exhibits a highly productive catalyst for PS activation via a non-radical pathway and provides a new idea for the degradation of PRO.

关键词： Iodine deficiency Heterojunction Persulfate(PS) Propranolol(PRO) Photocatalytic degradation

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The facile method developed for preparing polyvinylidene fluoride plasma separation membrane via macromolecular interaction

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Chinese Journal of Chemical Engineering 2022年第9期35卷 140-149页

作者： Juanjuan Liu Xiaolong Lu Guiming Shu Ke Li Shuyun Zheng Xiao Kong Tao Li Jun Yang Tianjin Key Laboratory of Extracorporeal Life Support for Critical Diseases Tianjin Artificial Cell Engineering Technology Research CenterInstitute of Hepatobiliary DiseaseThe Third Central Hospital Affiliated to Nankai UniversityTianjin Third Central HospitalTianjin 300170China State Key Laboratory of Separation Membrane and Membrane Processes School of Material Science and EngineeringInstitute of Biological and Chemical EngineeringTiangong UniversityTianjin 300387China Clinical Laboratory Tianjin Children’s HospitalTianjin 300074China State Key Laboratory of Membrane Materials and Membrane Applications Tianjin Motimo Membrane Tech.Co.LtdTianjin 300457China The Key Laboratory of Bioactive Materials College of Life ScienceNankai UniversityTianjin 300000China

The design of membrane pore is critical for membrane preparation. Polyvinylidene fluoride(PVDF) membrane exhibits outstanding properties in the water-treatment field. However, it is a huge challenge to prepare PVDF macro-pore plasma separation membrane by non-solvent induced phase separation(NIPS). Herein, a facile strategy is proposed to prepare PVDF macro-pore plasma separation membrane via macromolecular interaction. ATR-FTIR and ^(1)H NMR showed that the intermolecular interaction existed between polyethylene oxide(PEO) and polyvinylpyrrolidone(PVP). It could significantly affect the PVDF macro-pore membrane structure. The maximum pore of the PVDF membrane could be effectively adjusted from small-pore/medium-pore to macro-pore by changing the molecular weight of PEO. The PVDF macro-pore membrane was obtained successfully when PEO-200 k existed with PVP. It exhibited higher plasma separation properties than the currently used plasma separation ***, it had excellent hemocompatibility due to the similar plasma effect, hemolysis, prothrombin time, blood effect and complement C_(3a) effect with the current utilized plasma separation membrane,implying its great potential application. The proposed facile strategy in this work provides a new method to prepare PVDF macro-pore plasma separation membrane by NIPS.

关键词： Membranes Macro-pore plasma separation membrane Hemocompatibility Purification Biomedical engineering

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