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A novel method for calculating broadband electrical performance of high-speed aircraft radome under thermo-mechanical-electrical coupling

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CHINESE JOURNAL OF AERONAUTICS 2024年第9期37卷 463-474页

作者： Ji, Jianmin Ren, Jianhua Jiang, Xunya Wang, Wei Yu, Huilong Yin, Kai Chen, Bo beijing Inst Remote Sensing Equipment Beijing 100854 Peoples R China Shanghai DongJun Informat & technol co ltd Shanghai 200050 Peoples R China

The electrical performance of radomes on high-speed aircraft can be influenced by the thermal and mechanical loads produced during high-speed flight, which can affect the detection distance and accuracy of the guidance system. This paper presents a new method that uses the Finite Difference Time Domain (FDTD) method to calculate the electrical performance of radomes under Thermo-Mechanical-Electrical (TME) coupling. This method can accurately characterize the effects of material dielectric temperature drift and structural deformation on the electrical performance of the radome under flight conditions, enabling high-precision full-wave calculations of the broadband electrical performance of the radome. The method initiates by utilizing a Finite Element Grid Model (FE-GM) of the radome to sequentially acquire the radome's response temperature field and structural deformation field through thermal and mechanical simulations. Subsequently, spatial mapping techniques are developed to accurately incorporate the dielectric temperature drift and structural deformation of the radome into its Yee grid Electromagnetic (EM) simulation model. A verification case was designed to test the proposed method, and the results confirmed its high computational accuracy. Additionally, the effectiveness and necessity of the method were further demonstrated by analyzing the electrical performance of a fused silica ceramic radome used on a high-speed aircraft. (c) 2024 Production and hosting by Elsevier ltd. on behalf of Chinese Society of Aeronautics and Astronautics. This is an open access article under the CC BY-NC-ND license (http://***/ licenses/by-nc-nd/4.0/).

关键词： High-speed aircraft Radomes Thermo-Mechanical- Electrical (TME) coupling Finite Difference Time Domain (FDTD) method Spatial mapping DESIGN

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Characterization of serum proteomic and inflammatory profiling at early stage of iron deficiency in weaned piglets

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ANIMAL NUTRITION 2024年第3期18卷 380-389页

作者： Liu, Guang Li, Lan Liu, Shuan Dong, Zhenglin Zhou, Jian Gong, Chengyan Yin, Yulong Tang, Wenjie Wan, Dan Chinese Acad Sci Inst Subtrop Agr Lab Anim Nutr Physiol & Metab Proc Key Lab Agroecol Proc Subtrop Reg Changsha 410125 Peoples R China Huazhong Agr Univ Coll Anim Sci & Technol Hubei Hongshan Lab Wuhan 430070 Peoples R China beijing dabeinong technol grp co ltd Beijing 100080 Peoples R China Univ Chinese Acad Sci Beijing 101408 Peoples R China Sichuan Anim Sci Acad Anim Breeding & Genet Key Lab Sichuan Prov Chengdu 610066 Peoples R China Sichuan Animtech Feed co ltd Livestock & Poultry Biol Prod Key Lab Sichuan Prov Chengdu 610066 Peoples R China

The objective of this study was to examine the early serum proteomic and inflammatory profiles of weaned piglets subjected to iron deficiency. Twelve healthy piglets (Duroc x Landrace x Large Yorkshire, body weight: 4.96 +/- 0.05 kg) were weaned at 21 days of age. Subsequently, these animals were randomly allocated to one of two groups, with six replicates in each group (maintaining a male-to-female ratio of 1:1), the control group (administered 100 mg/kg Fe as FeSO4$H2O) and L-Fe group (no additional Fe supplementation). The results showed that 42 days after initiating, compared with control group, routine blood analysis revealed a reduction in serum iron content, red blood cell (RBC) count, hemoglobin (HGB) content, hematocrit (HCT), and mean corpuscular volume (MCV) (P compared with control group (P conversion ratio, and tissue coefficients were similar between the two groups (P > 0.05). During the early stages of iron deficiency, piglets exhibited increased villus height (VH) and the ratio of VH to crypt depth (CD) in the duodenum (P coprotein Ib platelet subunit alpha (GPIbA) expression was decreased. This

关键词： Piglet Iron deficiency Proteomics Inflammatory Cytokine Immune response DIETARY IRON GLYCINE CHELATE ANEMIA SUPPLEMENTATION EXPRESSION HEPCIDIN IMMUNE GROWTH TRANSPORTERS PERFORMANCE

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Surface coating Enabling Sulfide Solid Electrolytes with Excellent Air Stability and Lithium compatibility

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ENERGY & ENVIRONMENTAL MATERIALS 2024年第6期7卷 41-49页

作者： Luo, Min Wang, Changhong Duan, Yi Zhao, Xuyang Wang, Jiantao Sun, Xueliang GRINM grp corp ltd Natl Power Battery Innovat Ctr Beijing 100088 Peoples R China China Automot Battery Res Inst co ltd Beijing 100088 Peoples R China Gen Res Inst Nonferrous Met Beijing 100088 Peoples R China Eastern Inst technol Eastern Inst Adv Study Ningbo 315200 Peoples R China

All-solid-state lithium metal batteries (ASSLMBs) featuring sulfide solid electrolytes (SEs) are recognized as the most promising next-generation energy storage technology because of their exceptional safety and much-improved energy density. However, lithium dendrite growth in sulfide SEs and their poor air stability have posed significant obstacles to the advancement of sulfide-based ASSLMBs. Here, a thin layer (approximately 5 nm) of g-C3N4 is coated on the surface of a sulfide SE (Li6PS5Cl), which not only lowers the electronic conductivity of Li6PS5Cl but also achieves remarkable interface stability by facilitating the in situ formation of ion-conductive Li3N at the Li/Li6PS5Cl interface. Additionally, the g-C3N4 coating on the surface can substantially reduce the formation of H2S when Li6PS5Cl is exposed to humid air. As a result, Li-Li symmetrical cells using g-C3N4-coated Li6PS5Cl stably cycle for 1000 h with a current density of 0.2 mA cm(-2). ASSLMBs paired with LiNbO3-coated LiNi0.6Mn0.2co0.2O2 exhibit a capacity of 132.8 mAh g(-1) at 0.1 C and a high-capacity retention of 99.1% after 200 cycles. Furthermore, g-C3N4-coated Li6PS5Cl effectively mitigates the self-discharge behavior observed in ASSLMBs. This surface-coating approach for sulfide solid electrolytes opens the door to the practical implementation of sulfide-based ASSLMBs.

关键词： anode interface g-C3N4 coating Li6PS5Cl lithium dendrite inhibition solid-state lithium metal batteries METAL BATTERIES IMPROVEMENT FE

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Chemical Activation of S/Li2S in Li-S Batteries by a Bidirectional Organic Redox Mediator

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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES 2024年第5期40卷 927-934页

作者： Li, Chengqiu Zhou, Chaoyong Mei, Shilin Yao, Changjiang beijing Inst technol Sch Mechatron Engn State Key Lab Explos Sci & Safety Protect Beijing 100081 Peoples R China Xian Safty Energy technol co ltd Xian 710299 Peoples R China

The energy density and lifespan of prototype Li-S batteries under high sulfur loading and lean electrolyte have been mainly restricted by the incomplete interconversion between insulating S8 and Li2S. The introduction of an electrocatalyst has been preserved as an effective way to breakthrough the bottleneck of the interconversion rate. Herein, we demonstrate a novel bidirectional redox mediator, insoluble dithiobisphthalimide (DTPI), as the electrocatalyst for both S8 reduction and Li2S oxidation. Due to the dual-functional role of both electron/Li+ donor and acceptor, DTPI can efficiently accelerate the redox reactions during charge/discharge and significantly alleviate the incomplete conversion of sulfur species. consequently, the Li-S batteries with DTPI deliver superior specific capacity and cycling stability in comparison with those without DTPI. Especially, the redox mediator is scalable for synthesis and the DTPI-based 5 Ah pouch cell delivers a specific discharge capacity of around 870 mAhg(-1) at 0.1 C (1 C=1675 mA/g) without capacity fading over 80 cycles. The bidirectional catalysis mechanism has been studied through theoretical calculation and ex-situ characterization of the cathode materials. This work approves the effectiveness of bidirectional organic redox mediator in the construction of practical Li-S batteries.

关键词： Lithium-sulfur battery (LSB) Dithiobisphthalimide (DTPI) Organic redox mediator Interconversion LITHIUM FRAMEWORK

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Numerical simulation of fluid-thermal-structural coupling characteristics of stratospheric non-rigid airship

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CHINESE JOURNAL OF AERONAUTICS 2024年第9期37卷 224-236页

作者： Du, Huafei Lyu, Mingyun Yu, Chuan Wu, Yifei Wu, Yongmei Sun, Kangwen Beihang Univ Sch Aeronaut Sci & Engn Beijing 100191 Peoples R China Linzhou Ningbo technol co ltd Yuyao 315042 Peoples R China

The voluminous stratospheric non-rigid airship is very sensitive to the external thermal environment. The temperature change of internal gas caused by the variation in the external thermal environment and wind speed will lead to a change in the shape and buoyancy of the airship, thereby affecting its flight control. The traditional static analysis method is difficult to accurately reflect this fluid-thermal-structural coupling process. In this paper, the iterative analysis method was established for the fluid-thermal-structural coupling effect of stratospheric non-rigid airship based on the models of fluid, thermal, and structural deformation. considering the load such as the internal thermal effect and external flow field of the airship, the simulation of the thermoinduced structural deformation effect was conducted using Fluent and Abaqus software. The influence of local time and external wind speed on the structural deformation, volume, and equilibrium altitude of the airship was analyzed. The results demonstrate that, at low wind speed, the influence of aerodynamic pressure on the deformation of the airship is negligible. However, a great amount of heat is carried away by the wind, then the structural deformation caused by internal and external pressure difference is alleviated and the equilibrium altitude of the airship change obviously. This can serve as a guideline for the design and flight test of the long-endurance stratospheric nonrigid airship.

关键词： Altitude change Fluid-thermal-structural Stratospheric non-rigid air- Structural deformation Wind speed SOLAR-ARRAY PERFORMANCE OPTIMIZATION SHAPE

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Energy release characteristics of PTFE/Al/TiH2 reactive jet with different TiH2 content

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DEFENCE technolOGY 2024年第9期39卷 168-176页

作者： Jiang, Chunlan Zhang, Jingbo Hu, Rong Mao, Liang Li, Ming beijing Inst technol State Key Lab Explos Sci & Technol Beijing 100081 Peoples R China

Titanium hydride (TiH2), a promising high-energy additive, is doped into PTFE/Al to optimize the energy output structure of the reactive jet and strive for better aftereffect damage ability to the target. Six types of PTFE/Al/TiH2 reactive liners with different TiH2 content are prepared by the molding and sintering method. The energy release characteristics of PTFE/Al/TiH2 reactive jet are tested by the transient explosion energy test, and are characterized from pressure and temperature. The reaction delay time, pressure history, and temperature history of the energy release process are obtained, then the actual value of released energy and reaction efficiency of the reactive jet are calculated. The results show that the peak pressure and temperature of the PTFE/Al/TiH2 jet initially increase and then decrease with increasing TiH2 content. When the TiH2 content is 10%, the actual value of released energy and reaction efficiency increased by 24% and 6.4%, respectively, compared to the PTFE/Al jet. The reaction duration of the reactive material is significantly prolonged as the TiH2 content increased from 0% to 30%. Finally, combined with the energy release behaviors of PAT material and the dynamic deformation process of liner, the enhancement mechanism of TiH2 on energy release of the reactive jet is expounded. (c) 2024 China Ordnance Society. Publishing services by Elsevier B.V. on behalf of KeAi communications co. ltd. This is an open access article under the CC BY-NC-ND license (http://***/ licenses/by-nc-nd/4.0/).

关键词： PTFE/Al/TiH2 Reactive materials Shaped charge Impact energy release characteristics TITANIUM

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Experimental investigation of bed-to-wall heat transfer in fluidized beds of a Geldart B sorbent particle under a full spectrum of fluidization regime

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PARTICUOLOGY 2024年第10期93卷 235-246页

作者： Xu, Chenhuan Zhang, Yongmin Wang, Liang Zhang, Yiming Yang, Tianlei Qiu, Feng Liu, Cenfan Jiang, Shuai Dong, Ke China Univ Petr State Key Lab Heavy Oil Proc Beijing 102249 Peoples R China beijing DERUNCHEN Environm Protect technol co ltd Beijing 100022 Peoples R China China Special Equipment Inspect & Res Inst Key Lab Special Equipment Safety & Energy Saving S Beijing 100029 Peoples R China

Fluidization technology has been used in co 2 capture processes, the successful design and operation of the heat exchangers involved in this process require much information on the bed-to-wall heat transfer of the sorbent particles in fluidized states. In this study, the bed-to-wall heat transfer coefficient ( h ) of a solid amine sorbent was measured by a heat transfer probe in a large-scale circulating fluidized bed cold model unit, where full spectrum of fluidization regimes can be realized. The corresponding hydrodynamic signals were also studied by pressure sensors and optical fiber probes to further explain the newly discovered phenomenon. The results show that in a dense bed, due to the counterbalanced effect of time fraction of packet and packet renewal frequency, h of the Geldart B particle reaches a peak within the bubbling fluidized regime, and the radial distribution of h are opposite in bubbling and turbulent fluidized regimes. In a fast fluidization regime, gas convection becomes the dominant factor affecting h when the solids holdup is low enough. correlations were provided or recommended to guide the design of heat exchangers in the fluidized bed co 2 capture processes. (c) 2024 Chinese Society of Particuology and Institute of Process Engineering, Chinese Academy of Sciences. Published by Elsevier B.V. All rights are reserved, including those for text and data mining, AI training, and similar technologies.

关键词： Bed-to-wall heat transfer Solid amine sorbent Geldart B particle Full spectrum of fluidization regime correlation coNTINUOUS co2 CAPTURE TEMPERATURE HYDRODYNAMICS TRANSITION TUBE INTEGRATION TRANSPORT

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Preparation and characterization of high-reactivity explosive-based nano-boron microspheres

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PARTICUOLOGY 2024年第10期93卷 125-136页

作者： Dong, Chen Wang, Yi Jia, Kanghui Song, Dan Song, Xiaolan An, Chongwei North Univ China Sch Mat Sci & Engn Taiyuan 030051 Peoples R China Jinxi grp Shanxi Jiangyang Chem co ltd Taiyuan 030051 Peoples R China China Ordnance Inst Sci & technol Beijing 100089 Peoples R China North Univ China Sch Environm & Safety Engn Taiyuan 030051 Peoples R China

Boron nanoparticles, with their remarkably high gravimetric and volumetric calorific values, emerge as the most promising fuel in energetic fields. However, challenges such as susceptibility to oxidation, high ignition temperature, and low combustion efficiency have constrained their further applications. In this study, we fabricated high explosives based nano-boron microspheres with uniform size using the electrostatic spray method, in which the boron nanoparticles and high explosives (CL-20 or PETN) are closely bonded together by fluorinated polymer (F-2602) and evenly distributed. The results indicated that the microspheres exhibited high sphericity and showed an enhanced antioxidant capability. The addition of high-energy explosives not only reduced the thermal oxidation temperature of nano-boron powder within the microspheres but also significantly enhanced the pressurization rate. Additionally, the microspheres with added high-energy explosives released more energy during the combustion process. compared to physically mixed samples, electrostatically sprayed microspheres with a uniform microstructure still exhibited higher reactivity. Therefore, the design and synthesis of microspheres with controllable structures using the electrostatic spray method show promising application prospects. (c) 2024 Chinese Society of Particuology and Institute of Process Engineering, Chinese Academy of Sciences. Published by Elsevier B.V. All rights are reserved, including those for text and data mining, AI training, and similar technologies.

关键词： Nano-boron CL-20 PETN Electrospraying Ignition and combustion NANOPARTICLES coMBUSTION

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Machine learning optimization strategy of shaped charge liner structure based on jet penetration efficiency

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DEFENCE technolOGY 2024年第9期39卷 23-41页

作者： Zhao, Ziqi Li, Tong Sheng, Donglin Chen, Jian Yan, Amin Chen, Yan Wang, Haiying Chen, Xiaowei Dai, Lanhong Chinese Acad Sci Inst Mech State Key Lab Nonlinear Mech Beijing 100190 Peoples R China Univ Chinese Acad Sci Sch Future Technol Beijing 100049 Peoples R China Univ Chinese Acad Sci Sch Engn Sci Beijing 100049 Peoples R China beijing Inst technol State Key Lab Explos Sci & Technol Beijing 100081 Peoples R China

Shaped charge liner (SCL) has been extensively applied in oil recovery and defense industries. Achieving superior penetration capability through optimizing SCL structures presents a substantial challenge due to intricate rate-dependent processes involving detonation-driven liner collapse, high-speed jet stretching, and penetration. This study introduces an innovative optimization strategy for SCL structures that employs jet penetration efficiency as the primary objective function. The strategy combines experimentally validated finite element method with machine learning (FEM-ML). We propose a novel jet penetration efficiency index derived from enhanced cutoff velocity and shape characteristics of the jet via machine learning. This index effectively evaluates the jet penetration performance. Furthermore, a multi-model fusion based on a machine learning optimization method, called XGBOOST-MFO, is put forward to optimize SCL structure over a large input space. The strategy's feasibility is demonstrated through the optimization of copper SCL implemented via the FEM-ML strategy. Finally, this strategy is extended to optimize the structure of the recently emerging CrMnFecoNi high-entropy alloy conical liners and hemispherical copper liners. Therefore, the strategy can provide helpful guidance for the engineering design of SCL. (c) 2024 China Ordnance Society. Publishing services by Elsevier B.V. on behalf of KeAi communications co. ltd. This is an open access article under the CC BY-NC-ND license.

关键词： Jet penetration efficiency Shaped charge liner FEM-ML XGBOOST MFO High-entropy alloy LONG ROD PERFORMANCE coMPRESSIBILITY EXTENSION SEARCH DESIGN MODEL

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Force-position collaborative optimization of rope-driven snake manipulator for capturing non-cooperative space targets

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CHINESE JOURNAL OF AERONAUTICS 2024年第9期37卷 369-384页

作者： Li, Xiaofeng Tian, Jian Wei, Cheng Cao, Xibin Harbin Inst technol Sch Astronaut Harbin 150001 Peoples R China China Acad Space technol Beijing Inst Spacecraft Syst Engn Beijing 100094 Peoples R China

With the rapid development of space activities, non-cooperative space targets increase swiftly, such as failed satellites and upper stages, threating normal spacecrafts seriously. As there are some problems in the capture process, such as excessive collision and fast tumbling of targets, manipulator with redundant Degrees of Freedom (DOFs) can be used to improve the compliance and therefore solve these problems. The Rope-Driven Snake Manipulator (RDSM) is a combination of hyper-redundant DOFs and better compliance, and therefore it is suitable for capturing mission. In this paper, a snake manipulator mechanism is designed, and the complete kinematic model and system dynamic model considering RDSM, target and contact is established. Then, to obtain the configuration of joint with hyper-redundant DOFs, an improved motion dexterity index is proposed as the joint motion optimization target. Besides, the force-position collaborative optimization index is designed to adjust active stiffness, and the impedance control method based on the modified index is used to capture the space target. Finally, the proposed force-position collaborative optimization method is verified by virtual prototype co-simulation. The results demonstrate that based on the proposed method, the collision force is reduced by about 25% compared to normal impedance control, showing higher safety. (c) 2024 Production and hosting by Elsevier ltd. on behalf of Chinese Society of Aeronautics and Astronautics. This is an open access article under the CC BY-NC-ND license (http://***/ licenses/by-nc-nd/4.0/).

关键词： Capturing non-cooperative space targets Rope-driven snake manipu- lator Force-position collaborative optimization Redundant degrees of free- dom Active stiffness adjustment DUAL-ARM SPACE IMPEDANCE coNTROL ROBOT DEXTERITY INDEX

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