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SSRN 2023年

作者： Wu, Chongtian Qiu, Chenghui Yuan, Xiaolu Yuan, Nenglin Zhang, Bixiao Li, Yonghao Qin, Liwei Shi, Hong College of Energy & Power Engineering Jiangsu University of Science and Technology 2 Mengxi Jingkou Zhenjiang212003 China Key Laboratory of Aircraft Environment Control and Life Support MIIT Nanjing University of Aeronautics & Astronautics 29 Yudao Street Nanjing210016 China

PCMs are widely employed in electronic thermal control systems for spacecraft because of their substantial energy storage competencies. Therefore, the influence of gravitational acceleration (GA) on PCM thermal performance is of particular importance. This study employs numerical simulation to assess PCM heat transfer efficiency and thermal behavior of BTMS cooled under varying gravitational environments (0.05 g, 0.1 g, 1 g, 10 g, and 20 g) and different inclination angles (θ=90°, 45°, 0°) via the enthalpy-porosity method. Research results indicate that as gravity increases from 0.05 g to 20 g, the melting time of PCM shortened by 15%, reducing from 95.05 s to 81.30 s. This phenomenon can be explained by the enhanced convective heat transfer capability, increasing the maximum velocity (Vmax) of the liquid PCM (PCMl) by over 12 times. Particularly, when GA= 10 g, increasing θ from 45° to 90° reduces PCM melting time by 59.05s (9.66% reduction) compared to θ=45°, while at θ=0°, it decreases by 65.75 s (10.75% reduction). Notably, at θ=45°, some unmelted solid PCM accumulates in the lower right corner of the enclosure hindering the BTMS heat transfer. Based on the characteristics of PCM melting and accumulation effects, three optimization structures for different θ are proposed in this study. It can be observed at t=240s that the enhancement of PCM melting phenomenon is particularly prominent with the presence of fins. Furthermore, by comparing CHTC curves before and after optimization, it is evident that the accumulated effect has been effectively eliminated after optimization. These research findings offer reference and insights for the design of BTMS in the aerospace field. © 2023, The Authors. All rights reserved.

关键词： Phase change materials

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Innovative Liquid Cooling Channel Enhanced Battery Thermal Management (Btm) Structure Based on Stepwise Optimization Method

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SSRN 2023年

作者： Wu, Chongtian Yuan, Xiaolu Kong, Benben Zou, Yitao Shi, Hong College of Energy & Power Engineering Jiangsu University of Science and Technology 2 Mengxi Jingkou Zhenjiang212003 China Key Laboratory of Aircraft Environment Control and Life Support MIIT Nanjing University of Aeronautics & Astronautics 29 Yudao Street Nanjing210016 China

Lithium-ion batteries have garnered significant attention in the field of new energy technologies owing to their remarkable high energy density characteristics. This paper proposes a compact battery liquid-cooling system and perform structural optimization based on a stepwise optimization concept, aimed at comprehensively enhancing the performance of the Battery Liquid Cooling System (BLCS). Firstly, this paper conducts an energy consumption optimization of the flow velocity (V), diameter (D), and the contact angle (θ). Subsequently, the entropy weighted-TOPSIS method is utilized for objective optimization, thereby obtaining the optimal configuration based on comprehensive considerations of power consume (Pc), maximum temperature (Tmax) and maximum temperature difference (ΔT), with V=0.4 m/s, D=3 mm, θ=75°. When the initial temperature=25 ℃ and discharge rate=3 C, this structure yields the following results: Tmax =28.089 ℃, ΔT=2.884 ℃, and Pc=19.484 J. Furthermore, in the re-optimization phase, a lightweight design is applied to the system. In this phase, we optimize three parameters for the layered conductive fin: the number of layers (L), the height of each layer (Lh), and the thickness (Lw). By enumerating Lw=0, thirteen operating conditions are considered with L ranging from 1 to 4 layers, and Lh taking values of 5 mm, 7 mm, 9 mm, and 11 mm. Employing the entropy weight-TOPSIS method, the optimal solution is determined by comprehensively considering δ, Tmax, and ΔT. Under this condition, the weights for δ, Tmax, and ΔT are 41.02%, 30.82%, and 28.16%, respectively. Following comprehensive evaluation, the optimal solution is attained: L=3, Lh=7. Under these conditions, the BLCS achieves Tmax=29.196 ℃, ΔT=3.753 ℃, and δ=0.755, resulting in a weight reduction of 61 g (20.7%) for components of BLCS excluding the battery. This research through a stepwise optimization method, has accomplished a comprehensive enhancement of both energy consumption and mass for the BLCS,

关键词： Structural optimization

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Innovative Compact Thermal Management for High-Density Lithium-Ion Batteries: A Hybrid Cooling Solution

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SSRN 2024年

作者： Yuan, Xiaolu Zheng, Rentong Yang, Jiaming Kong, Benben Shi, Hong College of Energy & Power Engineering Jiangsu University of Science and Technology 2 Mengxi Jingkou Zhenjiang212003 China Key Laboratory of Aircraft Environment Control and Life Support MIIT Nanjing University of Aeronautics & Astronautics 29 Yudao Street Nanjing210016 China

Efficient heat dissipation technology for high heat flux density in compact energy storage battery packs is crucial for future development and currently represents a major bottleneck in technological advancement. To address this issue, this study proposes an innovative thermal management strategy: a compact hybrid air-cooling and liquid-cooling system designed to optimize the thermal efficiency of lithium-ion battery modules. The research methodology included the development of a physical model for the battery thermal management system (BTMS), complemented by experimental validation and grid independence checks to ensure the precision of the simulation outcomes. A controlled variable technique was applied to thoroughly examine the effects of five pivotal parameters on BTMS efficacy: the height of the liquid cooling tubes, the angle of contact between the tubes and the batteries, the velocity of the cooling liquid at the inlet, and the temperature of the cooling water. To simplify the analytical process and enable swift optimization, the study innovatively incorporated orthogonal experimental design, genetic aggregation, and the rank sum ratio (RSR) method, thereby circumventing the need for extensive CFD predictive computations. The optimal system configuration, as determined by these techniques, realized a peak surface temperature of 26.6 °C, a temperature gradient of 3.5 °C, a total energy expenditure of 52486 J, and a system mass of 0.099 kg under specific conditions: a 0 mm elevation difference between the cooling tubes and batteries, a 60° contact angle, a cooling liquid flow rate of 0.93 m/s, and a cooling water temperature of 22.5 °C. The results of this study confirm that the proposed hybrid cooling system markedly improves the thermal performance of lithium-ion battery modules, providing a practical solution for high-power applications. © 2024, The Authors. All rights reserved.

关键词： Lithium-ion batteries

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Numerical Investigations of Phase Change Material (Pcm)-Based Battery Thermal Management System (Btms) Under Variable Gravity Environment

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SSRN 2023年

PCMs are widely employed in electronic thermal control systems for spacecraft because of their substantial energy storage competencies. Therefore, the influence of gravitational acceleration (GA) on PCM thermal performance is of particular importance. This study employs numerical simulation to assess PCM heat transfer efficiency and thermal behavior of BTMS cooled under varying gravitational environments (0.05 g, 0.1 g, 1 g, 10 g, and 20 g) and different inclination angles (θ=90°, 45°, 0°) via the enthalpy-porosity method. Research results indicate that as gravity increases from 0.05 g to 20 g, PCM’s melting time shortened by 15%, reducing from 95.05 s to 81.30 s. This phenomenon can be explained by the enhanced convective heat transfer capability, boosting over 12 times in the maximum velocity (Vmax) of the liquid PCM (PCMl). Particularly, when GA= 10 g, increasing θ from 45° to 90° reduces PCM melting time by 59.05s (9.66% reduction) compared to θ=45°, while at θ=0°, it decreases by 65.75 s (10.75% reduction). Notably, at θ=45°, solid accumulation in PCM hinders BTMS heat transfer. These research findings are instrumental in the design of BTMS for aerospace applications, facilitating the optimization of thermal management systems and performance enhancement. © 2023, The Authors. All rights reserved.

关键词： Phase change materials

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Ultrafast dynamics and coherent vibrations in zinc chlorin aggregates

Ultrafast dynamics and coherent vibrations in zinc chlorin a...

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Conference on Lasers and Electro-Optics/Pacific Rim, CLEOPR 2018

作者： Shi, Tongchao Du, Juan Liu, Zhengzheng Zhang, Zeyu Leng, Yuxin Miyatake, Tomohiro Tamiaki, Hitoshi Kobayashi, Takayoshi State Key Laboratory of High Field Laser Physics Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai201800 China University of Chinese Academy of Sciences Beijing100049 China School of Physical Science and Technology ShanghaiTech University Shanghai200031 China Department of Materials Chemistry Ryukoku University Otsu Shiga520-2194 Japan Graduate School of Life Sciences Ritsumeikan University Kusatsu Shiga525-8577 Japan BrainScience Inspered Life Support Research Center University of Electro-Communications Chofu Tokyo182-8585 Japan

The ultrafast dynamics of zinc chlorin aggregates were studied by 7.1fs transient absorption spectroscopy. And interaction of the Frenkel exciton with the coherent molecular vibrations were obtained by 7.1fs real-time... 详细信息

ISBN: (纸本)9781943580453

关键词： Aggregates

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Analysis of pollutant concentration in aircraft cabin under MCT single engine drift descent status

Analysis of pollutant concentration in aircraft cabin under ...

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

作者： Qianlong Ding Xizhong Jian Haiming Shen Guangya Zhu Dalin Zhang Weijian Chen Key Laboratory of Aircraft Environment Control and Life Support MIIT Nanjing University of Aeronautics & Astronautics Nanjing People's Republic of China Shanghai Aircraft Design and Research Institute of COMAC Shanghai People's Republic of China College of Flight Technology Civil Aviation University of China Tianjin People's Republic of China

ISBN: (数字)9781837242108

Concentration distribution of air pollutants in commercial aircraft cabins are important for providing passengers and crew wi th a healthy and comfortable environment. To verify whether the concentration of air pollutants meets airworthiness standards, this article focuses on the cabin of a specific aircraft and employs numerical simulation to analyze the CO 2 concentration distribution during single-engine drift. The MCT single-engine drift calculations reveal that pollutants initially increase and then decrease as the aircraft descends from 7620m to the emergency ventilation altitude, the concentrations of pollutants in the x section, y section and z section increasing by 66.87%, 55.61%, and 61.08% respectively, maintaining pollutant concentrations within acceptable limits throughout the drift.

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An integrative drug repositioning framework discovered a potential therapeutic agent targeting COVID-19

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Signal Transduction and Targeted Therapy 2021年第5期6卷 1585-1600页

作者： Yiyue Ge Tingzhong Tian Suling Huang Fangping Wan Jingxin Li Shuya Li Xiaoting Wang Hui Yang Lixiang Hong Nian Wu Enming Yuan Yunan Luo Lili Cheng Chengliang Hu Yipin Lei Hantao Shu Xiaolong Feng Ziyuan Jiang Yunfu Wu Ying Chi Xiling Guo Lunbiao Cui Liang Xiao Zeng Li Chunhao Yang Zehong Miao Ligong Chen Haitao Li Hainian Zeng Dan Zhao Fengcai Zhu Xiaokun Shen Jianyang Zeng Institute for Interdisciplinary Information Sciences Tsinghua UniversityBeijingChina NHC Key laboratory of Emeric Pathogenic Microbiology Jiangsu Provincial Center for Diseases Control and PreventionNanjingJiangsu ProvinceChina Shanghai Institute of Materia Medica Chinese Academy of SciencesShanghaiChina Silexon Al Technology Co. Ltd.NanjingJiangsu ProvinceChina Department of Computer Science University of Illinois at Urbana-ChampaignIllinoisILUSA School of Pharmaceutical Sciences Tsinghua UniversityBeijingChina School of Electronic Information and Communications Huazhong University of Science and TechnologyWuhanHubei ProvinceChina Institute of Pathology Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhanHubei ProvinceChina Department of Automation Tsinghua UniversityBeijingChina Inner Mongolia Alashan League Organization Establishment Committee Office Electronic Support Center AlashanInner MongoliaChina Convalife(Shanghai)Co. Ltd.ShanghaiChina Advanced Innovation Center for Human Brain Protection Beijing Tiantan HospitalCapital Medical UniversityBeijingChina Beijing Advanced Innovation Center for Structural Biology Tsinghua-Peking Joint Center for Life SciencesDepartment of Basic Medical SciencesSchool of MedicineTsinghua UniversityBeijingChina Center for Global Health Nanjing Medical UniversityNanjingJiangsu ProvinceChina

The global spread of severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)requires an urgent need to find effective therapeutics for the treatment of coronavirus disease 2019(COVID-19).In this study,we developed an integrative drug repositioning framework,which fully takes advantage of machine learning and statistical analysis approaches to systematically integrate and mine large-scale knowledge graph,literature and transcriptome data to discover the potential drug candidates against *** in silico screening followed by wet-lab validation indicated that a poly-ADP-ribose polymerase 1(PARP1)inhibitor,CVL218,currently in Phase I clinical trial,may be repurposed to treat *** in vitro assays revealed that CVL218 can exhibit effective inhibitory activity against SARS-CoV-2 replication without obvious cytopathic *** addition,we showed that CVL218 can interact with the nucleocapsid(N)protein of SARS-CoV-2 and is able to suppress the LPS-induced production of several inflammatory cytokines that are highly relevant to the prevention of immunopathology induced by SARS-CoV-2 infection.

关键词： prevention respiratory acute

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Dynamics of non-linear photo-excited multi-exciton state coupled to coherent vibration in J aggregate

Dynamics of non-linear photo-excited multi-exciton state cou...

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Nonlinear Optics, NLO 2017

作者： Du, Juan Han, Dongjia Kobayashi, Takayoshi Miyatake, Tomohiro Tamiaki, Hitoshi Leng, Yuxin State Key Laboratory of High Field Laser Physics Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai201800 China Advanced Ultrafast Laser Research Center and Brain Science Inspired Life Support Research Center University of Electro-Communications 1-5-1 Chofugaoka Chofu Tokyo182-8585 Japan Water Frontier Science and Technology Research Center Tokyo University of Science 1-3 Shinjuku 162-6801 Japan Department of Materials Chemistry Ryukoku University Otsu Shiga520-2194 Japan Department of Bioscience and Biotechnology Ritsumeikan University Kusatsu Shiga525-8577 Japan

The excitonic relaxation and coherent vibrational dynamics in stairlike zinc chlorin aggregates prepared for mimicking chlorosome in nature have been studied by 6.8fs real-time laser spectroscopy. © OSA 2017.

ISBN: (纸本)9780960038060

关键词： Laser spectroscopy

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Research on Reliability Assessment Method of Emergency Escape Parachute

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Journal of Physics: Conference Series 2020年第1期1544卷

作者： Fangyun Ma Huajin Lei Wensheng Wang Jing Liu Liying Jin Aviation Key Laboratory Science and Technology on Life-Support Technology Hubei Xiangyang 441003 China Aerospace Life-Support Industries Ltd. Hubei Xiangyang 441003 China School of Mechanical Engineering Hubei University of Arts and Science Xiangyang 441053 China

Aiming at the problem that emergency escape parachute cannot meet the requirements of the index using the binomial evaluation method, combined with the characteristics of emergency escape parachute products, comprehensively using emergency escape parachute components and system test data, the emergency escape parachute Bayesian reliability assessment method is proposed to solve the problem of reliability assessment in the case of small sample size of emergency escape parachute system test, which effectively reducing emergency escape parachute test expenses and development cycle.

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Research on the Application of supportability Analysis technology in Ejection Seat

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Journal of Physics: Conference Series 2019年第1期1215卷

作者： Wensheng Wang Liying Jin Jing Liu Xi Sun Aviation Key Laboratory Science and Technology on Life-Support Technology HubeiXiangyang 441003 China Aerospace Life-Support Industries Ltd. HubeiXiangyang 441003 China School of Mechanical Engineering Xi'an Jiaotong University Shaanxi Xi'an 710049 China

Ejection seat is a complex system that can be both one-time-used and continuous-used, in which the supportability analysis technology plays an essential role. supportability analysis includes Reliability-Centered Maintenance Analysis (RCMA, for short), Corrective Maintenance Analysis, Level of Repair Analysis (LORA, for short), Operation and Maintenance Task Analysis (O&MTA, for short), support Equipment Requirement Analysis and Spare Parts Requirement Analysis (shortened as '6A'). Firstly, in this paper, the concept of '6A' technology and their relationship are introduced. The general '6A' working process of a certain type of ejection seat is then studied. In the end, the '6A' work is carried out on a certain type of ejection seat according to the analytical steps and requirements to '6A'.

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