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Multi-scale collaborative design method for macroscopic thermal optimization and mesoscopic woven structure of hypersonic vehicle's TOCMC leading edge

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Chinese Journal of Aeronautics 2024年第4期37卷 524-541页

作者： chenwei ZHAO Zecan TU Junkui MAO Jian HUI Pingting CHEN College of Energy and Power Engineering Nanjing University of Aeronautics and AstronauticsNanjing 21016China Integrated Energy Institute Nanjing University of Aeronautics and AstronauticsNanjing 210016China

A new thermal protection design method for hypersonic vehicle's leading edge is proposed, which can effectively reduce temperature of the leading edge without additional cooling measures. This method reduces the leading-edge's temperature by the multi-scale collaborative design of the macroscopic thermal optimization and the mesoscopic woven structures of Three-dimensional Orthogonal Woven Ceramic Matrix Composites(TOCMC). The macroscopic thermal optimization is achieved by designing different mesoscopic woven structures in different regions to create combined heat transfer channels to dredge the heat. The combined heat transfer channel is macroscopically represented by the anisotropic thermal conductivity of TOCMC. The thermal optimization multiple linear regression model is established to optimize the heat transport channel, which predicts Theoretical Optimal Thermal Conductivity Configuration(TOTCC) in different regions to achieve the lowest leading-edge temperature. The function-oriented mesostructure design method is invented to design the corresponding mesostructure of TOCMC according to the TOTCC, which consists of universal thermal conductivity prediction formulas for TOCMC. These universal formulas are firstly derived based on the thermal resistance network method, which is verified by experiments with an error of 6.25%. The results show that the collaborative design method can effectively reduce the leading edge temperature by about 12.8% without adding cooling measures.

关键词： Multi-scale collaborative design Thermal optimization Ceramic matrix composite Hypersonic vehicle Thermal protection Intelligent optimization

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Analysis of strength characteristics of loess before and after freezing using a hollow cylinder torsional shear apparatus

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Research in Cold and Arid Regions 2024年第2期16卷 63-72页

作者： Peng Shen QingZhi Wang JianHong Fang chenwei Wang Kui Zhang School of Civil Engineering and Water Resources Qinghai UniversityXiningQinghai 810016China Qinghai Scientific Research Observation Base Key Laboratory of Highway Construction and Maintenance Technology in Permafrost RegionsMinistry of TransportXiningQinghai 810016China

This paper aims to comprehensively analyze the influence of the principal stress angle rotation and intermediate principal stress on loess's strength and deformation characteristics. A hollow cylinder torsional shear apparatus was utilized to conduct tests on remolded samples under both normal and frozen conditions to investigate the mechanical properties and deformation behavior of loess under complex stress conditions. The results indicate significant differences in the internal changes of soil particles, unfrozen water, and relative positions in soil samples under normal and frozen conditions, leading to noticeable variations in strength and strain *** frozen state, loess experiences primarily compressive failure with a slow growth of cracks, while at normal temperature, it predominantly exhibits shear failure. With the increase in the principal stress angle, the deformation patterns of the soil samples under different conditions become essentially consistent, gradually transitioning from compression to extension, accompanied by a reduction in axial strength. The gradual increase in the principal stress axis angle(α) reduces the strength of the generalized shear stress and shear strain *** an increasing α, frozen soil exhibits strain-hardening characteristics, with the maximum shear strength occurring at α = 45°. The intermediate principal stress coefficient(b) also significantly impacts the strength of frozen soil, with an increasing b resulting in a gradual decrease in generalized shear stress strength. This study provides a reference for comprehensively exploring the mechanical properties of soil under traffic load and a reliable theoretical basis for the design and maintenance of roadbeds.

关键词： Loess Hollow cylinder torsional shear apparatus Major principal stress angle Intermediate principal stress coefficient

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Mediating Effect of Mindfulness,Self-Esteem and Psychological Resilience in the Relation between Childhood Maltreatment and Life Satisfaction

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International Journal of Mental Health Promotion 2024年第6期26卷 481-489页

作者： He Zhong Yaping Zhou chenwei Liu Yintao Cao Beijing Huijia Private School Beijing102299China Department of Psychology Hunan Normal UniversityChangsha410081China School of Education Hunan University of Science and TechnologyXiangtan411100China

Childhood maltreatment,as a typical early adverse environment,is known to have a negative impact on one’s life ***,on the other hand,may serve as a protective *** study explored the mediating role of mindfulness and its related variables–positive thoughts,psychological resilience and *** order to testify the mechanism,we administered Childhood Trauma Questionnaire(CTQ),Satisfaction with Life Scale(SWLS),Mindful Attention Awareness Scale(MAAS),Connor–Davidson Resilience Scale(CD-RISC)and Rosenberg Self-Esteem Scale(RSES)to a non-clinical sample of Chinese university students(N=1021).The results indicated that positive thoughts did not mediate the relationship between childhood maltreatment and life satisfaction,but self-esteem(β=−0.194,95%CI=[−0.090,−0.040])and psychological resilience(β=−0.063,95%CI=[−0.059,−0.020])mediated the relationship,as well as the“mindfulness-selfesteem”(β=−0.061,95%CI=[−0.287,−0.126])and“mindfulness-psychological resilience”(β=−0.035,95%CI=[−0.115,−0.034]).The results of this study were helpful to understand the relationship between childhood maltreatment and life satisfaction and provided a theoretical basis for the development of mindfulness intervention programs from the perspective of positive psychology.

关键词： Mindfulness childhood maltreatment life satisfaction self-esteem resilience

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Multifunctional high-performance pressure/proximity/temperature sensors enabled by hybrid resistive-supercapacitive response

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Nano Research 2024年第6期17卷 5604-5613页

作者： Huijun Kong Zhongqian Song Meichun Ding Changxiang Shao Jiahui Yu Baolei Wang Weiyan Li chenwei Li Li Niu School of Chemistry and Pharmaceutical Engineering Shandong First Medical University and Shandong Academy of Medical SciencesJinan 250117China College of Artificial Intelligence and Big Data for Medical Sciences Shandong First Medical University and Shandong Academy of Medical SciencesJinan 250117China School of Chemical Engineering and Technology Sun Yat-sen UniversityZhuhai 519082China

The issue of sensitivity attenuation in high-pressure region has been a persistent concern for pressure-sensitive electronic *** order to tackle such trade-off between sensitivity and linear range,herein,a hybrid piezoresistive-supercapacitive(HRSC)strategy is proposed via introducing a piezoresistive porous aerogel layer between the charge collecting electrodes and iontronic films of the pressure ***,the HRSC-induced impedance regulation and supercapacitive behavior contribute to significant mitigation in sensitivity attenuation,achieving high sensitivity across wide linear range(44.58 kPa^(−1)from 0 to 3 kPa and 23.6 kPa^(−1)from 3 to 12 kPa).The HRSC pressure sensor exhibits a low detection limit of 1 Pa,fast responsiveness(~130 ms),and excellent cycling stability,allowing to detect tiny pressure of air flow,finger bending,and human ***,the HRSC sensor exhibits exceptional perception capabilities for proximity and temperature,broadening its application scenarios in prosthetic perception and electronic *** proposed HRSC strategy may boost the ongoing research on structural design of high-performance and multimodal electronic sensors.

关键词： multimodal sensor pressure sensor high sensitivity MXene/poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)(PEDOT:PSS)aerogel structural design

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Influences of the tank liquid lateral sloshing and mass time-varying on high clearance self-propelled sprayer ride comfort

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International Journal of Agricultural and Biological Engineering 2024年第1期17卷 12-22页

作者： Liquan Lu Junchang Zhang Cui Cui Jun Chen Yu Chen Hongling Jing Shuo Zhang Sugirbay Adilet chenwei Hu Jiayu Cao College of Mechanical and Electronic Engineering Northwest A&F UniversityYangling 712100ShaanxiChina Weifang Engineering Vocational College Weifang 261000ShandongChina Technical Faculty S.Seifullin Kazakh Agro Technical UniversityAstana 101400Kazakhstan

To explore the influence of the lateral sloshing and the time-varying mass of the liquid in the tank on the ride comfort of the high-clearance sprayer,a spring-mass-damping equivalent mechanics that can describe the lateral sloshing of the liquid under different filling ratios was constructed based on the equivalent *** Fluent was used to simulate the moment acting on the wall of the tank by the lateral sloshing of the liquid,and then the parameters of the equivalent mechanical model are obtained by fitting and *** analysis of Fluent simulation and bench test on lateral sloshing of tank liquid under different filling *** results show that the lateral sloshing trend of the tank liquid level obtained from the Fluent simulation and the bench test was consistent,which proved the accuracy of the Fluent fluid simulation process and the correctness of the required equivalent mechanical model *** a liquid sloshing equivalent model,a four-degree-of-freedom vertical dynamic model of the sprayer half-car was ***,the performance of the sprayer was systematically analyzed and compared under the excitation of a bump road and a random E-level *** investigation took into account varying liquid filling ratios of 10%,50%,and 90%.The focus lay on evaluating the vertical acceleration of the sprayer body,dynamic deflection of the suspension,and dynamic load on the tires in response to these road *** analysis is conducted independently of the liquid sloshing *** results show that the lateral sloshing of the liquid medicine significantly reduces the ride smoothness of the machine,and makes the vibration response of the machine produce a certain hysteresis *** the reduction of the quality of the liquid medicine in the spray tank,the vibration amplitude of the sprayer body gradually decreases,the hysteresis effect is also gradually *** results presented in this study offer a

关键词： high clearance self-propelled sprayer liquid lateral sloshing ride comfort system dynamics simulation

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Progress of GECAM Observation Research

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空间科学学报 2024年第4期44卷 668-673页

作者： WANG chenwei ZHANG Yanqiu XIONG Shaolin LIU Jiacong TAN Wenjun XIAO Shuo XIE Shenglun XUE Wangchen ZHAO Haisheng ZHAO Yi ZHENG Chao Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049 University of Chinese Academy of Sciences Beijing 100049 Guizhou Normal University Guizhou 550025 Central China Normal University Wuhan 4300795 Dezhou University Dezhou 253023

Gravitational wave high-energy Electromagnetic Counterpart All-sky Monitor(GECAM)is a constellation with four instruments(launch date):GECAM-A/B(10 December 2020),GECAM-C(27 July 2022)and GECAM-D(13 March 2024),which are dedicated to monitoring gamma-ray transients in *** primary science objectives of GECAM include Gamma-Ray Bursts(GRBs),Soft Gamma-ray Repeaters(SGRs),high energy counterparts of Gravitation Wave(GW)and Fast Radio Burst(FRB),Solar Flares(SFLs),as well as Terrestrial Gamma-ray Flashes(TGFs)and Terrestrial Electron Beams(TEBs).A series of observations and research have been made since the launch of GECAM-A/*** observations provide new insights into these highenergy transients,demonstrating the unique role of GECAM in the“multi-wavelength,multi-messenger”era.

关键词： GECAM Gravitational wave electromagnetic counterpart High energy transients

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高压环境下水滴碰撞动力学研究

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工程热物理学报 2024年第4期45卷 1233-1239页

作者：张宸玮章振宇北京理工大学机械与车辆学院北京100081

考虑到发动机燃烧室内的真实环境,搭建了高压环境下液滴碰撞试验系统。通过高速相机与长焦显微镜头的组合首次实现了较高环境压力下液滴碰撞过程的拍摄并得到高清水滴碰撞图像。基于拍摄得到的图像,开发了一套数据处理方法,完成了液滴... 详细信息

考虑到发动机燃烧室内的真实环境,搭建了高压环境下液滴碰撞试验系统。通过高速相机与长焦显微镜头的组合首次实现了较高环境压力下液滴碰撞过程的拍摄并得到高清水滴碰撞图像。基于拍摄得到的图像,开发了一套数据处理方法,完成了液滴碰撞过程中碰撞韦伯数We与碰撞参数B的量化,并得到了用于分析液滴碰撞结果的We-B诺谟图。发现当水滴碰撞的环境压力较小时,碰撞结果有融合、拉伸分离与反向分离;但当碰撞的环境压力逐渐升高,水滴碰撞后出现了“弹开”的现象。随后参考Estrade等对液滴碰撞结果的分析,将液滴碰撞后的形状因子进行修正,并将环境压力的影响考虑在内,得到了不同环境压力下液滴碰撞后融合与弹开的分界线,实现了与试验数据的高度吻合。

关键词：液滴碰撞弹开高压形状因子

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新型生产关系的特点和形成路径

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学术前沿 2024年第9期 27-34页

作者：王琛伟中国宏观经济研究院经济体制与管理研究所研究室

新质生产力在劳动者、劳动资料、劳动对象三个要素上都体现出新特点,决定了适应新质生产力发展的新型生产关系必然具有有别于从前的新内容,新型生产关系不仅调整生产过程中人与人之间的关系,也进一步拓展到调整人与人工智能之间的关系;... 详细信息

新质生产力在劳动者、劳动资料、劳动对象三个要素上都体现出新特点,决定了适应新质生产力发展的新型生产关系必然具有有别于从前的新内容,新型生产关系不仅调整生产过程中人与人之间的关系,也进一步拓展到调整人与人工智能之间的关系;不仅包括适应新质生产力发展的科技体制,也包括更高效的新型生产要素配置体制机制、新型生产组织方式,有可能部分重构原有的经济、科技体制机制框架。形成新型生产关系迫切需要解决“创新”和“质优”两方面问题,关键是要进一步深化经济体制改革、科技体制改革,着力解决束缚新质生产力发展的突出问题,加快形成高效的新型要素配置方式、新型生产组织方式,构建保障和促进新质生产力发展的新型体制机制。

关键词：新质生产力新型生产关系创新质优

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脉络膜生理特性及其与儿童青少年近视的关联

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中国学校卫生 2024年第2期45卷 296-299,304页

作者：梁刚潘臣炜云南大学附属医院眼科昆明650021 苏州大学苏州医学院公共卫生学院

脉络膜是位于巩膜和Bruch膜之间的一个多功能动态结构,可能参与了眼球生长调节与近视发展,脉络膜厚度可能是预测儿童青少年近视发展及治疗防控效果的重要生物标志物。研究对脉络膜的生理结构、测量方法进行了综述和总结,探讨了脉络膜的... 详细信息

脉络膜是位于巩膜和Bruch膜之间的一个多功能动态结构,可能参与了眼球生长调节与近视发展,脉络膜厚度可能是预测儿童青少年近视发展及治疗防控效果的重要生物标志物。研究对脉络膜的生理结构、测量方法进行了综述和总结,探讨了脉络膜的影响因素,包括年龄、生理变化、屈光状态和眼轴长度、药物影响及光学环境等,指出了脉络膜厚度在儿童青少年近视研究中可能的应用。

关键词：脉络膜生理学近视影响因素

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全球教育“最佳实践”的塑造:社会情感学习在美国发展及溢出的政策网络分析

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教育发展研究 2024年第12期44卷 63-75页

作者：金津彭琛玮华东师范大学教育管理系上海200062

社会情感学习最早于20世纪90年代在美国兴起,后被很多国家和国际组织学习、借鉴,现已成为全球流行的新教育“最佳实践”。本文以社会情感学习兴起的关键政策结点——CASEL为聚焦,运用社会网络民族志的研究方法,追踪和呈现了这一流行的... 详细信息

社会情感学习最早于20世纪90年代在美国兴起,后被很多国家和国际组织学习、借鉴,现已成为全球流行的新教育“最佳实践”。本文以社会情感学习兴起的关键政策结点——CASEL为聚焦,运用社会网络民族志的研究方法,追踪和呈现了这一流行的“最佳实践”如何在美国兴起、兴盛并向全球流动的政策轨迹。本文基于对CASEL所在政策网络的建构、变化和拓展的分析,呈现了该政策网络在理念建构、网络联结、治理系统和政策迁移中的塑造技术和主导政策理性。研究结论呈现了“应用型政策”的新形态、新逻辑、新过程和新影响,对教育治理和全球教育“最佳实践”进行了重新审视。本文也结合政策网络分析,为我国开展社会情感教育提供了相关建议。

关键词：社会情感学习政策网络社会网络民族志政策社会学教育治理

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