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Lightweight multifunctional metamaterial with low-frequency vibroacoustic reduction and load-bearing performances

Applied Mathematics and Mechanics(English Edition) 2025年第3期46卷 403-422页

作者： Qi JIA Dianlong YU Donghai HAN Jihong WEN National Key Laboratory of Equipment State Sensing and Smart Support College of Intelligence Science and TechnologyNational University of Defense TechnologyChangsha 410073China

Metamaterials can control and manipulate acoustic/elastic waves on a subwavelength scale using cavities or additional ***,the large cavity and weak stiffness components of traditional metamaterials may cause a conflict between vibroacoustic reduction and load-bearing capacity,and thus limit their ***,we propose a lightweight multifunctional metamaterial that can simultaneously achieve low-frequency sound insulation,broadband vibration reduction,and excellent load-bearing performance,named as vibroacoustic isolation and bearing metamaterial(VIBM).The advent of additive manufacturing technology provides a convenient and reliable method for the fabrication of VIBM *** results show that the compressive strength of the VIBM is as high as 9.71 MPa,which is nearly 87.81%higher than that of the conventional grid structure(CGS)under the same volume ***,the vibration and sound transmission are significantly reduced over a low and wide frequency range,which agrees well with the experimental data,and the reduction degree is obviously larger than that obtained by the *** design strategy can effectively realize the key components of metamaterials and improve their application scenarios.

关键词： multifunctional metamaterial low-frequency sound insulation broadband vibration reduction load bearing

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Mission-oriented capability evaluation for combat network based on operation loops

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Defence technology（防务技术） 2024年第12期42卷 156-175页

作者： Yang Wang Junyong Tao Xiaoke Zhang Guanghan Bai Yunan Zhang Laboratory of Science and Technology on Integrated Logistics Support College of Intelligence Science and TechnologyNational University of Defense TechnologyChangsha 410073China National Key Laboratory for Complex Systems Simulation Beijing 100101China

With continuous growth in scale,topology complexity,mission phases,and mission diversity,challenges have been placed for efficient capability evaluation of modern combat *** at the problems of insufficient mission consideration and single evaluation dimension in the existing evaluation approaches,this study proposes a mission-oriented capability evaluation method for combat systems based on operation ***,a combat network model is given that takes into account the capability properties of combat ***,based on the transition matrix between combat nodes,an efficient algorithm for operation loop identification is proposed based on the Breadth-First *** the mission-capability satisfaction of nodes,the effectiveness evaluation indexes for operation loops and combat network are proposed,followed by node importance *** a case study of the combat scenario involving space-based support against surface ships under different strategies,the effectiveness of the proposed method is *** results indicated that the ROI-priority attack method has a notable impact on reducing the overall efficiency of the network,whereas the O-L betweenness-priority attack is more effective in obstructing the successful execution of enemy attack missions.

关键词： Combat network Operation loop identification Mission-oriented Network reliability Network effectiveness evaluation Strike strategies

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Comparison of impulse noise energy distribution from two generations of parachute gun 2

Comparison of impulse noise energy distribution from two gen...

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2023 2nd International Conference on Acoustics, Fluid Mechanics and Engineering, AFME 2023

作者： Li, Jun Xie, Wujun Li, Hui Huang, Guangjun Key Laboratory of Science and Technology on Life-support Technology AVIC Aerospace Life-support Industries Ltd Hubei Xiangyang441100 China

The rocket ejection seat is an advanced life-saving device for fighter pilots. However, it can also produce damaging impulse noise during ejection, which could compromise the pilot's hearing health, and the manufacturer must assess the noise damage. This study uses Variational Mode Decomposition (VMD) and Hilbert-Huang transform (HHT) to analyze energy-instantaneous distribution over time and frequency-instantaneous and energy contribution of different modes of impulse noise generated by the parachute gun in two generations of rocket ejection seats. The results demonstrate considerable disparities in the energy distribution of impulse noise generated by the parachute gun in the new generation seat compared to the old generation seat. The new generation seat has higher overall energy, more concentrated action time, and a higher energy contribution in the 1-10 kHz frequency range. These findings provide valuable data for the design of the new generation of noise protection equipment for pilots. © Published under licence by IOP Publishing Ltd.

关键词： Mathematical transformations

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Performance of Hearing Protectors in Ejection Seat Parachute Gun Firing 6th

Performance of Hearing Protectors in Ejection Seat Parachute...

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6th China Aeronautical science and technology Conference, CASTC 2023

作者： Xie, Wujun Min, Liwu Li, Jun Li, Hui Key Laboratory of Science and Technology on Life-Support Technology AVIC Aerospace Life-Support Industries Ltd. Hubei Xiangyang China

ISBN: (纸本)9789819988600

During ejection rescue, the parachute gun attached to a rocket-assisted ejection seat generates jet noise that may damage a pilot’s sensitive auditory organs;hence the effectiveness of hearing protectors, primarily a helmet and earmuffs, is evaluated. A parachute gun firing experiment is designed, and overpressure data with and without protection are measured simultaneously during firing using piezoelectric pressure sensors inside and outside dummy ears. A comparative study of the measured data is conducted using time domain analysis and wavelet transformation methods, and the results show that the jet noise generated by a parachute gun firing is a broadband signal, consisting of shock waves and impulse noise;different from the attenuation characteristics in the continuous noise environment, in the jet noise environment, the effect of hearing protectors is significant for extenuating the high-frequency components that are prone to injury, but not significant for extenuating the low-frequency components. © 2024, Chinese Society of Aeronautics and Astronautics.

关键词： Time domain analysis

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Evaluation of Long-Duration Fatigue Alleviation Effect of a Rocket Ejection Seat Installed at a 35° Angle Based on Heart Rate Variability 15

Evaluation of Long-Duration Fatigue Alleviation Effect of a ...

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15th Asia Conference on Mechanical and Aerospace Engineering, ACMAE 2024

作者： Li, Hui Li, Jun Key Laboratory of Science and Technology on Life-support Technology AVIC Aerospace Life-support Industries Ltd. No.1 AVIC Avenue Hubei Xiangyang China

ISBN: (纸本)9781643685892

Fatigue significantly impacts modern flight safety, leading to decreased pilot performance, judgment errors, flight illusions, and potentially severe accidents. Rocket ejection seat for emergency escape with additional 35° mounting angle design. To verify the fatigue improvement effect of this design for long-duration flights, a simulated long-duration flight test was conducted. The trial uses wearable wireless physiological monitoring equipment to collect ECG from trainees. Short-term heart rate variability (HRV) indicators reflecting fatigue state were selected from the time-domain, frequency-domain, and nonlinear characteristics of valid samples. Paired sample test results showed significant changes in short-term HRV indicators before and after resting with the rocket ejection seat installed at a 35° angle, indicating reduced sympathetic activity and increased parasympathetic activity, thus alleviating fatigue. © 2025 The Authors.

关键词： Heart

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Tripartite motif-containing protein 11(TRIM11):a novel weapon against Alzheimer’s disease

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Signal Transduction and Targeted Therapy 2024年第2期9卷 339-340页

作者： Yichu Fu Bi Zhang Jianfeng Liu College of Life Science and Technology Key Laboratory of Molecular Biophysics of MOEHuazhong University of Science and TechnologyWuhanHubei 430074China

In a recent study published in science,Zhang et *** that tripartite motif-containing(TRIM)protein 11(TRIM11)exhibited strong inhibition on tau aggregation,which is a pathological characteristic of tauopathies including Alzheimer’s disease(AD).1 This makes TRIM11 a promising novel target for the treatment of AD and other tauopathies.

关键词： Alzheimer tau TRIM

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Selenium-oxidizing Agrobacterium sp.T3F4 decreases arsenic uptake by Brassica rapa *** a native polluted soil

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Journal of Environmental sciences 2024年第4期138卷 506-515页

作者： Lijin An Chunzhi Zhou Lipeng Zhao Ao Wei Yiting Wang Huimin Cui Shixue Zheng State Key Laboratory of Agricultural Microbiology College of Life Science and TechnologyHuazhong Agricultural UniversityWuhan 430070China

Toxic arsenic(As)and trace element selenium(Se)are transformed by microorganisms but their complex interactions in soil-plant systems have not been fully *** Asand Se-oxidizing bacterium,Agrobacterium sp.T3F4,was applied to a native seleniferous As-polluted soil to investigate As/Se uptake by the vegetable Brassica rapa *** As-Se interaction as mediated by strain *** Se content in the aboveground plants was significantly enhanced by 34.1%,but the As content was significantly decreased by 20.5% in the T3F4-inoculated pot culture compared to the control(P<0.05).Similar result was shown in treatment with additional 5 mg/kg of Se(IV)in *** addition,the As contents in roots were significantly decreased by more than 35% under T3F4 or Se(IV)treatments(P<0.05).Analysis of As-Se-bacterium interaction in a soil simulation experiment showed that the bioavailability of Se significantly increased and As was immobilized with the addition of the T3F4strain(P<0.05).Furthermore,an As/Se co-exposure hydroponic experiment demonstrated that As uptake and accumulation in plants was reduced by increasing Se(IV)*** 50% growth inhibition concentration(IC50)values for As in plants were increased about one-fold and two-fold under co-exposure with 5 and 10μmol/L Se(IV),*** conclusion,strain T3F4 improves Se uptake but decreases As uptake by plants via oxidation of As and Se,resulting in decrease of soil As bioavailability and As/Se competitive absorption by *** provides a potential bioremediation strategy for Se biofortification and As immobilization in As-polluted soil.

关键词： Selenium oxidation Selenium biofortification Arsenite-oxidizing bacteria Arsenic immobilization Brassica rapa L

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Time-Frequency Characteristics of Parachute Gun Shockwave Based on VMD-HT 8

Time-Frequency Characteristics of Parachute Gun Shockwave Ba...

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8th International Conference on Communication, Image and Signal Processing, CCISP 2023

作者： Li, Jun Xie, Wujun Li, Hui Fang, Liyi AVIC Aerospace Life-support Industries LTD Key Laboratory of Science and Technology on Life-support Technology Xiangyang Hubei China

ISBN: (纸本)9798350305838

During the ejection process of the fighter pilot, the parachute is shot out by the life-saving seat gun, which generates a shockwave that endangers human safety. In order to accurately and stably extract the time-frequency distribution characteristics, the shockwave signal is obtained through parachute gun shooting experiments, and features of the shockwave signal is extracted by using Variational mode decomposition and Hilbert transform methods (VMD-HT). VMD is a high sampling rate shockwave signal decomposition technique, which is suitable for analysing unsteady airborne parachute gun shooting shockwave signals. The HT method is used to accurately extract the relationship between time, instantaneous frequency and energy for the decomposed signal, and to obtain the marginal spectra. The analytic results show that the shockwave signal lasting 3ms has a significant energy concentration in the low frequency band of 0∽1kHz, which is important for the better protection of pilots. © 2023 IEEE.

关键词： Variational mode decomposition

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Knockout of the fcsk gene in zebrafish causes neurodevelopmental defects

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Zoological Research 2025年第2期46卷 313-324页

作者： Zhen-Xing Liu Ting-Ting Zou Hui-Hui Liu Hai-Bo Jia Xian-Qin Zhang Key Laboratory of Molecular Biophysics of the Ministry of Education College of Life Science and Technology and Center for Human Genome ResearchHuazhong University of Science and TechnologyWuhanHubei 430074China

Congenital disorders of glycosylation(CDG)are a cluster of monogenic disorders resulting from defects in *** encodes fucokinase,an enzyme that catalyzes the phosphorylation of L-fucose to generate fucose-1-phosphate,an important step in *** in FCSK lead to CDG with an autosomal recessive inheritance pattern,primarily manifesting as developmental delay,hypotonia,and brain ***,no fcsk mutant animal models have yet been *** study constructed the first fcsk knockout(fcsk^(-/-))zebrafish model using CRISPR/Cas9 ***,fcsk^(-/-)zebrafish exhibited impaired growth,characterized by delayed epiboly and DNA accumulation during early embryonic development,as well as brain atrophy in ***-stage fcsk^(-/-)zebrafish displayed locomotor deficits and increased susceptibility to pentylenetetrazole-induced *** adulthood,fcsk^(-/-)zebrafish showed neurodevelopmental abnormalities,including increased anxiety,decreased aggression,reduced social preference,and impaired ***,total protein fucosylation was markedly reduced in fcsk^(-/-)zebrafish,accompanied by decreased expression of pofut2,which encodes protein Ofucosyltransferase 2,an enzyme involved in the fucosylation salvage *** activity was elevated in the midbrain-hindbrain boundary(MHB)of fcsk^(-/-)*** with GDP-L-fucose or the human FCSK gene restored developmental defects and total protein fucosylation in fcsk^(-/-)*** sequencing revealed dysregulated gene expression associated with glycosylation,apoptosis,and neurodegenerative *** findings suggest that fcsk^(-/-)zebrafish exhibit neurodevelopmental disorders,providing the first fcsk gene knockout animal model and offering a platform for investigating the molecular underpinnings of the disease and facilitating drug screening efforts.

关键词： Congenital disorders of glycosylation fcsk Zebrafish Behavior RNA sequencing

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A practical guide for fast implementation of SNARE-mediated liposome fusion

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Biophysics Reports 2024年第1期10卷 31-40页

作者： Shen Wang Cong Ma Key Laboratory of Molecular Biophysics of the Ministry of Education College of Life Science and TechnologyHuazhong University of Science and Technology

Soluble N-ethylmaleimide-sensitive factor attachment protein receptor(SNAER) family proteins are the engines of most intra-cellular and exocytotic membrane fusion pathways(Jahn and Scheller 2006).Over the past two decades, in-vitro liposome fusion has been proven to be a powerful tool to reconstruct physiological SNARE-mediated membrane fusion processes(Liu et al. 2017). The reconstitution of the membrane fusion process not only provides direct evidence of the capability of the cognate SNARE complex in driving membrane fusion but also allows researchers to study the functional mechanisms of regulatory proteins in related pathways(Wickner and Rizo 2017). Heretofore, a variety of delicate methods for in-vitro SNARE-mediated liposome fusion have been established(Bao et al. 2018;Diao et al. 2012; Duzgunes 2003; Gong et al. 2015; Heo et al. 2021; Kiessling et al. 2015; Kreye et al.2008; Kyoung et al. 2013; Liu et al. 2017; Scott et al. 2003). Although technological advances have made reconstitution more physiologically relevant, increasingly elaborate experimental procedures, instruments, and data processing algorithms nevertheless hinder the non-experts from setting up basic SNARE-mediated liposome fusion assays. Here, we describe a low-cost, timesaving, and easy-to-handle protocol to set up a foundational in-vitro SNARE-mediated liposome fusion assay based on our previous publications(Liu et al. 2023; Wang and Ma 2022). The protocol can be readily adapted to assess various types of SNARE-mediated membrane fusion and the actions of fusion regulators by using appropriate alternative additives(e.g., proteins, macromolecules, chemicals, etc.). The total time required for one round of the assay is typically two days and could be extremely compressed into one day.

关键词： Protocol SNARE Liposome fusion In-vitro reconstitution

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