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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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Research on the Pressure Comfort of Pilot Helmets 32

Research on the Pressure Comfort of Pilot Helmets

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32nd Congress of the International Council of the Aeronautical sciences, ICAS 2021

作者： Wang, Xiujuan Xu, Jing Wang, Juhao Mi, Jiachen Jiang, Yaming Aerospace Life-support Industries LTD Xiangyang441003 China Aviation Key Laboratory of Science and Technology on Life-support Technology Xiangyang441003 China Tiangong University School of Textile Science and Engineering Tianjin 300387 China Intel Engineering Simulation Technology Co. Ltd. Dalian116023 China

ISBN: (纸本)9783932182914

With the advancement of technology, the functions of pilot helmets are constantly being upgraded. The highly integrated helmets with display, positioning, sensing, night vision and camera are the future development trends. Although the multifunctional and highly integrated design enhances the combat maneuverability, the add-on components will result in local tenderness as the weight gain and center of gravity change, which seriously affects the pilot's wearing comfort, especially in high-speed overload conditions. These factors have become potential factors affecting flight safety. At present, experience-based methods are no longer suitable for new product development. Therefore, it is urgent to establish a simulation model on the pressure comfort of "helmet-head", the finite element method is used for simulation calculation. This paper studies different conditions of the center of gravity, and using the standard head shape, ball shape and real head shape as a control, to analyze the center of gravity, the difference of the head shape, and the influence of overload loading on the pressure distribution. By comparing with the actual flight situation, the simulation results are consistent with the actual situation, which proves that the simulation model has good credibility. © 2021 32nd Congress of the International Council of the Aeronautical sciences, ICAS 2021. All rights reserved.

关键词： Flight simulators

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RESEARCH ON OPTIMIZATION technology FOR CONTROL PARAMETERS OF EJECTION SEAT BASED ON PSO ALGORITHM 32

RESEARCH ON OPTIMIZATION TECHNOLOGY FOR CONTROL PARAMETERS O...

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32nd Congress of the International Council of the Aeronautical sciences, ICAS 2021

作者： Jin, Lou Wu, Ming Yang, Hui Wu, Liang Cui, Dongyue Overall Technology R and D Department AVIC Aerospace Life-support Industries Ltd. Xianyang441000 China Aviation Key Laboratory of Science and Technology on Life-support Technology Xianyang441000 China Institute of Mechanical and Electrical System AVIC The First Aircraft Institute Xi'an710000 China

ISBN: (纸本)9783932182914

This article studies the optimization simulation method of the multi-modal control parameters of a certain type of ejection seat. According to the working mechanism and optimization goals of the seat, based on the particle swarm optimization algorithm, an optimized simulation program is designed. Using an optimization simulation program written by the Matlab/Simulink platform, the preliminary determination, screening and iterative optimization of control parameters were completed. The optimization results show that by optimizing the multi-modal control parameters, the life-saving performance of the seat is increased by 12.5%, which verifies the effectiveness and feasibility of the optimization algorithm, and provides a theoretical basis for future seat development and modification.. © 2021 32nd Congress of the International Council of the Aeronautical sciences, ICAS 2021. All rights reserved.

关键词： Ejection seats

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A Novel Cooperative MIMO Transmission Scheme Based on STBC for Event-Driven WSNs 3

A Novel Cooperative MIMO Transmission Scheme Based on STBC f...

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3rd IEEE International Conference on Electronics technology, ICET 2020

作者： Jun, Li Wujun, Xie AVIC Aerospace Life-support Industries LTD. Aviation Key Laboratory of Science and Technology on Life-support Technology Xiangyang China

ISBN: (纸本)9781728162836

The cooperative MIMO (CMIMO) technology having characteristics of low energy expended and high reliability can be very well suited to resource-constrained event-driven wireless sensor networks (WSNs), in which collecting date is unpredictable for space and time. A novel energy-efficient STBC-based CMIMO transmission scheme is put forward for event-driven WSNs in this letter, which adopts cross-layer design and dynamic event cluster. Detailed energy models are developed to maximize energy saving by the joint optimization for the number of cooperative nodes and constellation size. Through computer simulation, It can be found that the novel transmission scheme saves more energy in comparison with the traditional transmission protocol. © 2020 IEEE.

关键词： Wireless sensor networks

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Sustainable wastewater treatment and reuse in space

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Journal of Environmental sciences 2024年第12期146卷 237-240页

作者： Baiwen Ma Libing Zheng Beizhen Xie Lingshan Ma Mingsheng Jia Chengcheng Xie Chengzhi Hu Mathias Ulbricht Yuansong Wei Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China Department of Water Pollution Control Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China Lehrstuhl für Technische Chemie II Universität Duisburg-EssenEssen 45117Germany Institute of Environmental Biology and Life Support Technology School of Biological Science and Medical EngineeringBeihang UniversityBeijing 100083China Center for Microbial Ecology and Technology(CMET) Ghent UniversityCoupure Links 6539000 GhentBelgium CSD New Concept Environmental Development Yixing Co. Ltd.Yixing 214000China

Exploring the vast extraterrestrial space is an inevitable trend with continuous human *** treatment and reuse are crucial in the limited and closed space that is available in spaceships or long-term use space bases that will be established in the foreseeable *** water treatment technologies have experienced iterative development for more than 60 years since the first manned spaceflight was successfully ***,we briefly review the related wastewater characteristics and the history of water treatment in space stations,and we focus on future challenges and perspectives,aiming at providing insights for optimizing wastewater treatment technologies and closing the water cycle in future.

关键词： Space Wastewater treatment Water recycle Water reuse Challenges Perspectives

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Numerical simulation on flow boiling characteristics in sinusoidal channels of airborne micro heat exchanger

Numerical simulation on flow boiling characteristics in sinu...

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2021 International Conference on Mechatronics technology and Aerospace Engineering, ICMTAE 2021

作者： Liang, Xingzhuang Xu, Yu Wang, Jian State Key Laboratory of Fire Science University of Science and Technology of China Hefei230026 China AVIC Shenyang Aircraft Design and Research Institute Shenyang110035 China Key Laboratory of Aircraft Environment Control and Life Support MIIT Nanjing University of Aeronautics and Astronautics Nanjing210016 China

With the miniaturization of airborne system, heat dissipation has become a critical issue. Since sinusoidal channel can enhance flow disturbance, it has a stronger heat exchange capacity than that of straight channel. However, flow boiling characteristics in sinusoidal channel are more complex. Here, numerical simulations of flow boiling in sinusoidal and straight microchannels are conducted based on the VOF model with the inner diameter of 1 mm, mass flux of 500 kg/m2 s and heat flux of 50 kW/m2. The effects of channel structure and hypergravity are obtained. The simulation results indicate that bubble evolution in sinusoidal channel is more complex than that in straight channel, and bubbles are more likely to coalesce, deform and break. Vortices appear in sinusoidal channel and disrupt the near-wall boundary layer. Bubble evolution combined with vortices affect the flow boiling performances. For straight channel, dryout is less likely to occur, while for sinusoidal channel, it is more likely due to more drastic flow changes. Furthermore, the transition of flow patterns is faster under hypergravity. For sinusoidal channel, flow patterns transform earlier into slug and circular flows. © Published under licence by IOP Publishing Ltd.

关键词： Vortex flow

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Optimization of High-Speed WIG Airfoil with Consideration of Non-ground Effect by a Two-Step Deep Learning Inverse Design Method

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Transactions of Nanjing University of Aeronautics and Astronautics 2025年第1期42卷 56-69页

作者： WANG Chenlu SUN Jianhong ZHENG Daren SUN Zhi ZUO Si LIU Hao LI Pei Key Laboratory of Aircraft Environment Control and Life Support Ministry of Industry and Information TechnologyNanjing University of Aeronautics and AstronauticsNanjing 210016P.R.China Key Laboratory of Civil Aviation Emergency Science&Technology Civil Aviation Administration of ChinaNanjing University of Aeronautics and AstronauticsNanjing 211106P.R.China State Key Laboratory of Mechanics and Control for Aerospace Structures Nanjing University of Aeronautics and AstronauticsNanjing 210016P.R.China

Under complex flight conditions,such as obstacle avoidance and extreme sea state,wing-in-ground(WIG)effect aircraft need to ascend to higher altitudes,resulting in the disappearance of the ground effect.A design of high-speed WIG airfoil considering non-ground effect is carried out by a novel two-step inverse airfoil design method that combines conditional generative adversarial network(CGAN)and artificial neural network(ANN).The CGAN model is employed to generate a variety of airfoil designs that satisfy the desired lift-drag ratios in both ground effect and non-ground effect ***,the ANN model is utilized to forecast aerodynamic parameters of the generated *** results indicate that the CGAN model contributes to a high accuracy rate for airfoil design and enables the creation of novel airfoil ***,it demonstrates high accuracy in predicting aerodynamic parameters of these airfoils due to the ANN *** method eliminates the necessity for numerical simulations and experimental testing through the design procedure,showcasing notable *** analysis of airfoils generated by the CGAN model shows that airfoils exhibiting high lift-drag ratios under both flight conditions typically have cambers of among[0.08c,0.105c],with the positions of maximum camber occurring among[0.35c,0.5c]of the chord length,and the leading-edge radiuses of these airfoils primarily cluster among[0.008c,0.025c]

关键词： conditional generative adversarial network(CGAN) artificial neural network(ANN) airfoil design wing-in-ground(WIG)aircraft ground effect

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Research on Intelligent Algorithm for Autonomous Landing of Quadrotor UAV 3

Research on Intelligent Algorithm for Autonomous Landing of ...

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3rd International Conference on Artificial Intelligence, Automation, and High-Performance Computing, AIAHPC 2023

作者： Xue, Chaohang Jin, Liying Hu, Kelian Hu, Xindong Shen, Yujie Xiangyang Key Laboratory of Intelligent Manufacturing and Machine Vision Hubei University of Arts and Science Hubei Province Xiangyang441053 China AVIC Aerospace Life-Support Industries Ltd. 441003 China Hubei Xiangyi New Material Technology Co. Ltd. 441003 China

ISBN: (数字)9781510666580

ISBN: (纸本)9781510666573

This paper takes the autonomous landing of four-rotor UAV as the specific research object. Aiming at the problem of identifying the feature points of landing signs and improving the accuracy of autonomous landing, an improved multi-objective soft subspace clustering algorithm is proposed. The anti-redundant mutation operator and forward comparison operation are designed, it is proposed to improve the population diversity and convergence speed of the algorithm. The iNSGA-II is used as the base algorithm, and the repair operator and local search operator are designed to reflect the clustering characteristics. An autonomous landing control model based on visual recognition is established. A large number of position feature points are clustered and analyzed to decouple the highly nonlinear mapping relationship in the feature space, and then the redundant information between the dimensions is stripped to achieve the maximum stability of the sampling points, the importance sequence of all features and the accurate classification. © 2023 SPIE.

关键词： Clustering algorithms

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Research on Logistics UAV path planning 3

Research on Logistics UAV path planning

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3rd International Conference on Artificial Intelligence, Automation, and High-Performance Computing, AIAHPC 2023

作者： Shen, Yujie Jin, Liying Hu, Kelian Hu, Xindong Xue, Chaohang Xiangyang Key Laboratory of Intelligent Manufacturing and Machine Vision Hubei University of Arts and Science Hubei Province Xiangyang441053 China AVIC Aerospace Life-Support Industries Ltd. 441003 China Hubei Xiangyi New Material Technology Co. Ltd. 441003 China

ISBN: (数字)9781510666580

ISBN: (纸本)9781510666573

This article is based on the logistics drone to deliver path planning problems in the urban environment. Combined with the flying characteristics of drones and the distribution location, considering the conditions such as the customer's collection and delivery needs, the logistics drone's delivery path planning model is established[4]. Secondly, the model is processed. For the first time, the NSGA-II algorithm is used to solve the order of the distribution path of the logistics drone, and the second will be solved by improving the traditional algorithm. In the drone execution task, if the weight coefficient of the target functions is adjusted, different transportation sequences and paths can be obtained, and different planning results can be obtained by adjusting the attention of customer satisfaction. The analysis of the algorithm is available. Compared with the traditional A*algorithm, the algorithm transportation path adopted in this article is shorter and the delivery is faster. © 2023 SPIE.

关键词： MATLAB

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Numerical simulation and experimental research on Taylor Couette flow characteristics in air gap of aviation motor

Numerical simulation and experimental research on Taylor Cou...

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

作者： Hui Ma Shuyue Liang Hongbo Zhan Lin Qi Weijian Chen Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration No.33 Shuige Road Nanjing People's Republic of China Key Laboratory of Aircraft Environment Control and Life Support MIIT Nanjing University of Areonautics and Astronautics No.29 Yudao Street Nanjing People's Republic of China

ISBN: (数字)9781837242108

A test bench with PIV technology was built and visualization research on Taylor vortex between concentric rotating cylinders was carried out to explore the flow morphology within the annular gap by changing the rotational speed of the inner cylinder. The numerical method and accuracy were verified by experiments. The selected turbulence model was then applied for numerical simulation of the Taylor Couette flow in a simplified air gap model of an aviation motor with smooth inner and outer walls. The Taylor Couette flow characteristics in the air gap under varying rotational speed were studied, and simulation results were given for flow with axial flow and without axial flow.

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