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7th China Aeronautical science and technology Conference, CASTC 2024

作者： Jin, Lou Wu, Jing Chen, Yuxiang Cui, Dongyue Aviation Key Laboratory of Science and Technology on Life-Support Technology Xianyang China Overall Technology R&D Department AVIC Aerospace Life-Support Industries Ltd. Xianyang China Institute of Mechanical and Electrical System AVIC The First Aircraft Institute Xi’an China

ISBN: (纸本)9789819797707

During normal flight, the ejection seat ventilation system provides a dedicated gas transmission channel for electronic oxygen and anti load regulators. The flow resistance of the pipeline directly affects the ventilation and supply performance of the regulator and the anti load protection ability during mobile operations. This article adopts a combination of numerical simulation and experimental testing methods to quantitatively analyze the flow resistance of a certain type of ejection seat ventilation pipeline. Based on the principle of gas supply performance testing and numerical simulation methods, a research process is designed. The simulation accuracy of different simulation models under different ventilation flow rates is analyzed, and the ventilation pipeline is optimized based on the calculation formula of pipeline flow resistance theory and the analysis results of pipeline flow field. The research results indicate that among multiple turbulence models, the Realizable k-e model has the best accuracy in simulating pipeline flow resistance, with a maximum error of 14.2% and a minimum error of 1.3% under different flow conditions, both below 15%, meeting the requirements for engineering use;the vortices generated at the corners and variable diameter areas of the ventilation pipeline can lead to energy dissipation. Optimizing the transition corners and pipeline diameter of the bend can reduce the generation of vortices and reduce the system flow resistance to 17.9% of the original value;under the premise of constant pipeline flow rate, the flow resistance of ventilation pipelines is inversely proportional to the fifth power of pipeline diameter. When optimizing pipeline flow resistance design, emphasis should be placed on optimizing from the pipeline diameter. © Chinese Society of Aeronautics and Astronautics 2025.

关键词： Ejection seats

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Effects of different water levels on phytoplankton in the Harbin section of the Songhua River

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Journal of Oceanology and Limnology 2025年第1期43卷 134-146页

作者： Yi’nan SUN Jingshen LI Yawen FAN Xinxin LU College of Life Science and Technology Harbin Normal UniversityHarbin 150025China Key Laboratory of Aquatic Organisms Harbin Normal UniversityHarbin 150025China

The functional diversity index of a phytoplankton body has gradually become a new mean of measuring and *** explore the response of phytoplankton taxonomy and the functional diversity index to interannual environmental changes,a survey on the structure of the phytoplankton community and water physicochemical characteristics of the water was carried out at 28 sampling points in the Harbin section of the Songhua River for three consecutive years in every May from 2021 to *** taxonomy diversity index and the functional diversity index were ***,The relationship between the structure of the characteristics of the community and environmental factors was explored;secondly,we reveal the responses of taxonomic and functional diversity indices to different habitats between years;finally,we explore the main environmental factors that control the taxonomic and functional diversity indices of *** show that,initially,environmental factors in water changes caused by different water levels between years affected the composition of phytoplankton ***,by comparing the taxonomic diversity index and the functional diversity index on a time scale,we found that the taxonomic diversity index was more responsive to environmental ***,the main environmental factors on the phytoplankton taxonomic diversity index were dissolved oxygen,Taxonomic diversity index,and specific conductivity,and the main environmental factors that affected the functional diversity index were dissolved oxygen,turbidity,and water *** study reveals the important role of the taxonomic diversity index in river water quality evaluation,obtained new information on the relative precision of the taxonomic diversity index and the functional diversity index in the evaluation of ecological health of the water,and provided a reliable tool for monitoring river water quality based on aquatic organisms.

关键词： Songhua River Basin phytoplankton functional diversity biodiversity index watershed ecology

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Decoding small peptides:Regulators of plant growth and stress resilience

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Journal of Integrative Plant Biology 2025年第3期67卷 596-631页

作者： Fei Xiao Huapeng Zhou Honghui Lin Xinjiang Key Laboratory of Biological Resources and Genetic Engineering College of Life Science and TechnologyXinjiang UniversityUrumqi 830046China Key Laboratory of Bio-resource and Eco-Environment of Ministry of Education College of Life SciencesSichuan UniversityChengdu 610064China

Small peptides(SPs)are pivotal signaling molecules that play essential roles in the precise regulation of plant growth,development,and stress *** advancements in sequencing technologies,bioinformatics approaches,and biochemical and molecular techniques have significantly enhanced the accuracy of SP identification,unveiling their diverse biological functions in *** review provides a comprehensive overview of the characteristics and methodologies for identifying SPs in *** highlights recent discoveries regarding the biological roles and signaling pathways of SPs in regulating plant growth,development,and plant-microbial interactions,as well as their contributions to plant resilience under various environmental stresses,including abiotic stress,nutrient deficiencies,and biotic ***,we discuss current insights into the potential applications of SPs and outline future research directions aimed at leveraging these molecules to enhance plant adaptation to environmental *** integrating recent findings,this review lays a foundation for advancing the understanding and utilization of SPs to improve plant resilience and productivity.

关键词： abiotic and biotic stress responses crop improvement plant developmental regulation plant-microbe interactions small peptide signaling

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Explore the Novel Relationship of Time-Frequency Domains in Multivariate Signals: A Dynamic System Perspective

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IEEE Transactions on Biomedical Engineering 2025年第6期72卷 2035-2045页

作者： Li, Yaru Liu, Yujie Ai, Yuqing Chen, Xiang Feng, Liuchang Yao, Dezhong Li, Min Valdes-Sosa, Pedro A. Ren, Peng Clinical Hospital of Chengdu Brain Science Institute MOE key Laboratory for Neuroinformation Center for Information in Medicine School of Life Science and Technology Chengdu611731 China

Objective: Time and frequency domains are two common dimensions used to characterize multivariate signals (MS). Previous research on the relationship between these two domains has mainly focused on how frequency components, such as power or phase, evolve over time. However, there may exist other unexplored relations between the time and frequency domains of MS. Methods: The study considers MS as a large-scale system and identifies its fundamental dynamic modes (DMs) with mutual orthogonality, regarding them as individual subsystems. Each DM encapsulates not only the spatial information but also displays a unique oscillatory frequency. The MS data at each time point is then projected onto these DMs, obtaining the DM-based time-frequency representation (DTFR). Results: Using electroencephalogram signals from three common brain diseases as illustrations, the results demonstrate that DTFR outperforms traditional time-frequency analysis approaches in disease discrimination. Conclusion: The DTFR reveals a novel relationship between the time and frequency domains of MS, namely how the subsystems of MS, each with its own characteristic oscillatory frequency, shape the dynamics of the overall large-scale system over time. Furthermore, the DTFR allows for the analysis of high-order interactions among all-lead signals as they change over time. Finally, the decomposition of DTFR can further uncover the time-frequency-topology relationships of MS from the perspective of dynamic systems. Significance: The DTFR approach expands the understanding of the relations between the time and frequency domains of MS, revealing new phenomena that have been unachievable by traditional methodologies, which might be widely used in many areas in the future. © 1964-2012 IEEE.

关键词： Topology

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Fe doping 1T phase MoS_(2)with enhanced zinc-ion storage ability and durability for high-performance aqueous zinc-ion batteries

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Rare Metals 2025年第1期44卷 253-263页

作者： Jing-Yi Liu Rong-Jie Zhe Zhan-Hong Peng Yi-Hui Song Lin-Xuan Yang Chen Qing Jun-Ling Guo Jin-Ping Liu Yunnan Key Laboratory of Opto-Electronic Information Technology College of Physics and Electronic Information TechnologyYunnan Normal UniversityKunming 650000China Country State Center for International Cooperation on Designer Low-Carbon and Environmental Materials School of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450001China School of Chemistry Chemical Engineering and Life ScienceState Key Laboratory of Advanced Technology for Materials Synthesis and ProcessingWuhan University of TechnologyWuhan 430070China

As a promising cathode material for aqueous zinc-ion batteries,1T-MoS_(2)has been extensively investigated because of its facile two-dimensional ion-diffusion channels and high electrical ***,the limited number of available Zn storage sites,i.e.,limited capacity,hinders its application because the inserted Zn^(2+),which form strong electrostatic interactions with 1T-MoS_(2),preventing subsequent Zn^(2+)***,the approach of enlarging the interlayer distance to reduce electrostatic interactions has been commonly used to enhance the capacity and reduce Zn^(2+)migration ***,an enlarged interlayer spacing can weaken the van der Waals force between 1T-MoS_(2)monolayers,easily disrupting the structural ***,to address this issue,an effective strategy based on Fe doping is proposed for 1T-MoS_(2)(Fe-1T-MoS_(2)).The theoretical calculations reveal that Fe doping can simultaneously moderate the rate of decrease in the adsorption energy after gradually increasing the number of stored atoms,and enhance the electron delocalization on metal-O ***,the experiment results show that Fe doping can simultaneously activate more Zn storage sites,thus enhancing the capacity,and stabilize the structural stability for improved cycling ***,Fe-1T-MoS_(2)exhibits a larger capacity(189 mAh·g^(-1)at 0.1 A·g^(-1))and superior cycling stability(78%capacity retention after 400 cycles at 2 A·g^(-1))than pure 1T-MoS_(2).This work may open up a new avenue for constructing high-performance MoS_(2)-based cathodes.

关键词： Aqueous zinc-ion battery 1T-MoS_(2) Fe doping More Zn storage sites Enhanced structural stability

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Coordinated control of decarbonization efficiency and oxygen absorption rate in Ruhrstahl–Heraeus degasser based on mechanism model and BP neural network

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Journal of Iron and Steel Research International 2025年第3期32卷 606-618页

作者： Lu-heng Jiang Min Wang Jia-qi Zhao Cheng Yao Li-dong Xing Xin-gang Ai State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing100083China Technical Support Centre for Prevention and Control of Disastrous Accidents in Metal Smelting University of Science and Technology BeijingBeijing100083China Institute of Research of Iron&Steel Zhangjiagang215600JiangsuChina School of Materials and Metallurgy University of Science and Technology LiaoningAnshan114051LiaoningChina

A mathematical model of the decarburization reaction zone was established for the Ruhrstahl–Heraeus (RH) forced oxygen blowing decarburization process by Matlab R2022b software. For the problem of inaccurate prediction due to the large variation range of oxygen absorption rate under different process conditions, we statistically analyzed the main factors affecting the oxygen absorption rate. The backpropagation neural network was used to train and predict the oxygen absorption rate and was used to calculate the RH decarburization reaction zone model. We designed and developed a mathematical modeling software with process control of decarburization in RH degasser, which can realize the change of operating process parameters in the dynamic prediction process. The optimized mathematical model has more than 95% of the furnaces whose absolute error in calculation of carbon content is within ± 5 × 10^(−6), more than 90% of the heats whose relative error in calculation of oxygen content is within ± 15%, and the average absolute error of calculation of oxygen content is 26.4 × 10−6. Finally, we studied the influence of oxygen blowing timing, oxygen blowing volume and initial oxygen content on the forced decarburization process.

关键词： Ruhrstahl-Heraeus degasser Mathematical model Forced decarburization Oxygen absorption rate Process control

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Controllable fabrication of Ag/ZnO/g-C_(3)N_(4)nanofiber heterojunctions for enhanced photocatalytic water disinfection

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Frontiers of Materials science 2025年第1期19卷 1-15页

作者： Lian Feng Penghao Zhang Yuan Li Fangxin Ye Yanze Ma Gongtian He Mingyu Lv Tian Zhang School of Chemistry Chemical Engineering and Life ScienceWuhan University of TechnologyWuhan 430070China Wuhan University of Technology Sanya Science and Education Innovation Park Sanya 572024China State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070China

With the accelerated development of urbanization,it is urgent to develop new green and effective fungicides for water disinfection,which can effectively sterilize without causing bacterial drug resistance and environmental *** this work,the new ternary nanofiber(NF)heterojunctions,Ag/ZnO/g-C_(3)N_(4)(Ag/ZCN),with high specific surface area were controllably fabricated through the photodeposition of different amounts of Ag quantum dots on electrospun ZCN ***/ZCN with 6 wt.%Ag was found to exhibit the highest antibacterial activity superior to that of ZCN and ZnO NFs,which completely killed *** or *** within 30 min under solar ***,it maintained high stability during four consecutive photocatalytic *** photocatalytic Z-scheme charge transportation mechanism of Ag/ZCN was confirmed through structure characterization and free radical capture *** was verified that the active oxygen substances such as∙OH,^(1)O_(2),and a certain amount of∙O_(2)^(−)were mainly produced in the photocatalytic sterilization ***,the Z-scheme NF heterojunction Ag/ZCN has great application potential in actual environmental water disinfection.

关键词： carbon nitride zinc oxide electrospinning photocatalytic antibacterial

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Facile formation of Mg-containing interphase on nanosilicon from Agar/MgCO3 precursor for lithium-ion battery anodes

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Progress in Natural science:Materials International 2025年第1期35卷 177-186页

作者： Ke Zhang Jianhua Zhou Haoran Liu Xiaoyang Wang Jie Gao Jun-Liang Chen Haiqing Qin Wenping Liu Xiaoxu Lei Lei Miao Guangxi Key Laboratory of Information Materials Guangxi Collaborative Innovation Center of Structure and Property for New Energy Materials School of Material Science and Engineering Guilin University of Electronic Technology Novel Battery Materials Research Center of Engineering Technology State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite StructuresSchool of Physical Science and Technology Guangxi University Guangxi Key Laboratory of Superhard Material Guangxi Technology Innovation Center for Special Mineral Material China Nonferrous Metal (Guilin) Geology and Mining Co. Ltd.

The ultra-high theoretical capacity(4200 mAh g-1) of Silicon anode materials for lithium-ion batteries while which is one of the ideal replacement materials for graphite anodes. However, the poor electrical conductivity and greatly reduces the cycle life of the battery of Silicon material, which suffers from severe volume expansion during charge/discharge cycling leading to electrode pulverization. In this work, Agar/magnesium carbonate-coated silicon nanocomposites were synthesized by utilizing the "self-solidifying" property of agar. The magnesium oxide formed by the decomposition of magnesium carbonate at high temperatures mitigates the volume expansion of nanosilicon together with the derived carbon layer. Moreover, the lithium-magnesium alloy electronconducting interface layer generated by the reaction between lithium ions and magnesium oxide, which greatly shortens the diffusion length of lithium ions and electrons inside the electrode during the charge-discharge cycle. The first discharge specific capacity was 2060.2 mAh g-1, the Coulombic efficiency as high as 86.28 %, and still possesses a reversible specific capacity of 801.5 mAh g-1after cycling 200 cycles at a high current of 500 mA g-1of Agar/magnesium@Si with optimal ratio composite. The composite material used in this work largely suppresses the volume expansion of the silicon anode and contributes to the design of low-cost and high Coulombic efficiency lithium-ion batteries.

关键词： Agar-coated Lithium-ion battery Lithium-magnesium conductive layer Silicon anode

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Anisotropy of coal pore connectivity: Experiments based on low-field nuclear magnetic resonance and low-temperature nitrogen adsorption

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Geophysics 2025年第3期90卷 MR169-MR182页

作者： Cui, Shidong Shi, Qingmin Wang, Shuangming Zhao, Hongchao Ji, Ruijun Xue, Weifeng Wang, Shengquan Xi'an University of Science and Technology College of Geology and Environment Xi'an China Xi'an University of Science and Technology Shaanxi Provincial Key Laboratory of Geological Support for Coal Green Exploitation Xi'an China Shaanxi Coal Chemical Industry Technology Research Institute Co. Ltd. Xi'an China

As an unconventional reservoir, coal is characterized by the development of micro/nanometer pores and significant pore differences in different bedding directions. Pore heterogeneity and anisotropy can affect the recovery of resources and the interpretation of seismic data. To date, research on coal anisotropy focuses mainly on the heterogeneity of pore distribution. Nonetheless, there are relatively few studies and a lack of comprehensive knowledge regarding pore connectivity differences within the same macrolithotype of coal in different bedding directions. We develop a novel method for studying the anisotropy of pore connectivity in coal. This method uses epoxy resin to seal the different surfaces of cubic coal samples, combined with refined pore characterization techniques, to conduct anisotropy studies at different pore scales. These include differences in pore connectivity in different bedding directions and the anisotropic characteristics of micron/nanoscale pores. The results indicate that the pores in various bedding directions differ considerably in their type and distribution modes. There is a wide range of pore types in the bedding-parallel direction, and the pores have regular variations. In contrast, the pore type is single in the bedding-normal direction, the pore distribution lacks an obvious pattern, and the pore complexity is higher. The anisotropy of the seepage pores is stronger than that of the adsorption pores, which is the main reason for the anisotropy of the reservoir properties. Based on an anisotropic study of coal pore connectivity, we can target the design of resource recovery processes to improve resource recovery. In directions with low permeability, measures such as water injection can be taken to enhance permeability. The pore size and connectivity in different bedding directions can also be considered by introducing anisotropic parameters to optimize the permeability anisotropy model and provide better guidance for resource recovery

关键词： Pore size

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Cryo-EM structure of a minimal reaction center–light-harvesting complex from the phototrophic bacterium Chloroflexus aurantiacus

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Journal of Integrative Plant Biology 2025年第4期 967-978页

作者： Guoqiang Huang Shishang Dong Lin Ma Lin Li Jinxin Ju Mei-Jiao Wang Jian-Ping Zhang Sen-Fang Sui Xiaochun Qin State Key Laboratory of Membrane Biology Beijing Advanced Innovation Center for Structural Biology School of Life SciencesTsinghua University Multiscale Research Institute of Complex Systems Fudan University School of Biological Science and Technology University of Jinan School of Chemistry and Life Resources Renmin University of China School of Life Sciences Southern University of Science and Technology

Photosynthetic organisms have developed various light-harvesting antenna systems to capture light and transfer energy to reaction centers（RCs）.Simultaneous utilization of the integral membrane light-harvesting antenna（LH complex） and the extrinsic antenna（chlorosomes） makes the phototrophic bacterium Chloroflexus（Cfx.） aurantiacus an ideal model for studying filamentous anoxygenic phototrophs（FAPs）. Here, we determined the structure of a minimal RC–LH photocomplex from Cfx. aurantiacus J-10-fl（CaRC–LH） at 3.05-? resolution. The CaRC–LH binds only to seven LH subunits, which form a crescent-shaped antenna surrounding the movable menaquinone-10（QB）binding site of Ca RC. In this complex with minimal LH units, an extra antenna is required to ensure sufficient light-gathering, providing a clear explanation for the presence of chlorosomes in Cfx. aurantiacus. More importantly, the semicircle of the antenna represents a novel RC–LH assembly pattern. Our structure provides a basis for understanding the existence of chlorosomes in *** and the possible assembly pattern of RC–LH.

关键词： Chloroflexus aurantiacus chlorosomes electron transfer photosynthesis RC–LH

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