Defence Technology(防务技术)最新文献_第2页

Resilient multi-objective mission planning for UAV formation: A unified framework integrating task pre- and re-assignment 无人机编队的弹性多目标任务规划：整合任务预分配和重新分配的统一框架

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Defence Technology(防务技术) Pub Date : 2025-03-01 DOI: 10.1016/j.dt.2024.08.002

Xinwei Wang , Xiaohua Gao , Lei Wang , Xichao Su , Junhong Jin , Xuanbo Liu , Zhilong Deng

{"title":"Resilient multi-objective mission planning for UAV formation: A unified framework integrating task pre- and re-assignment","authors":"Xinwei Wang , Xiaohua Gao , Lei Wang , Xichao Su , Junhong Jin , Xuanbo Liu , Zhilong Deng","doi":"10.1016/j.dt.2024.08.002","DOIUrl":"10.1016/j.dt.2024.08.002","url":null,"abstract":"<div><div>Combat effectiveness of unmanned aerial vehicle (UAV) formations can be severely affected by the mission execution reliability. During the practical execution phase, there are inevitable risks where UAVs being destroyed or targets failed to be executed. To improve the mission reliability, a resilient mission planning framework integrates task pre- and re-assignment modules is developed in this paper. In the task pre-assignment phase, to guarantee the mission reliability, probability constraints regarding the minimum mission success rate are imposed to establish a multi-objective optimization model. And an improved genetic algorithm with the multi-population mechanism and specifically designed evolutionary operators is used for efficient solution. As in the task-reassignment phase, possible trigger events are first analyzed. A real-time contract net protocol-based algorithm is then proposed to address the corresponding emergency scenario. And the dual objective used in the former phase is adapted into a single objective to keep a consistent combat intention. Three cases of different scales demonstrate that the two modules cooperate well with each other. On the one hand, the pre-assignment module can generate high-reliability mission schedules as an elaborate mathematical model is introduced. On the other hand, the re-assignment module can efficiently respond to various emergencies and adjust the original schedule within a millisecond. The corresponding animation is accessible at bilibili.com/video/BV12t421w7EE for better illustration.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"45 ","pages":"Pages 203-226"},"PeriodicalIF":5.0,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142189176","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Oscillation mechanism and predictive model of explosion load for natural gas in confined tube 密闭管道中天然气爆炸负荷的振荡机理和预测模型

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Defence Technology(防务技术) Pub Date : 2025-03-01 DOI: 10.1016/j.dt.2024.09.003

Chengjun Yue, Li Chen, Linfeng Xu

{"title":"Oscillation mechanism and predictive model of explosion load for natural gas in confined tube","authors":"Chengjun Yue, Li Chen, Linfeng Xu","doi":"10.1016/j.dt.2024.09.003","DOIUrl":"10.1016/j.dt.2024.09.003","url":null,"abstract":"<div><div>Gas explosion in confined space often leads to significant pressure oscillation. It is widely recognized that structural damage can be severe when the oscillation frequency of the load resonates with the natural vibration frequency of the structure. To reveal the oscillation mechanism of gas explosion load, the experiment of gas explosion was conducted in a large-scale confined tube with the length of 30 m, and the explosion process was numerically analyzed using FLACS. The results show that the essential cause of oscillation effect is the reflection of the pressure wave. In addition, due to the difference in the propagation path of the pressure wave, the load oscillation frequency at the middle position of the tunnel is twice that at the end position. The average sound velocity can be used to calculate the oscillation frequency of overpressure accurately, and the error is less than 15%. The instability of the flame surface and the increase of flame turbulence caused by the interaction between the pressure wave and the flame surface are the main contributors to the increase in overpressure and amplitude. The overpressure peaks calculated by the existing flame instability model and turbulence disturbance model are 31.7% and 34.7% lower than the numerical results, respectively. The turbulence factor model established in this work can describe the turbulence enhancement effect caused by flame instability and oscillatory load, and the difference between the theoretical and numerical results is only 4.6%. In the theoretical derivation of the overpressure model, an improved model of dynamic turbulence factor is established, which can describe the enhancement effect of turbulence factor caused by flame instability and self-turbulence. Based on the one-dimensional propagation theory of pressure wave, the oscillatory effect of the load is derived to calculate the frequency and amplitude of pressure oscillation. The average error of amplitude and frequency is less than 20%.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"45 ","pages":"Pages 13-27"},"PeriodicalIF":5.0,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143620434","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Design and implementation of a high-performance miniaturized multi-layer magnetic shielding spherical shell with minimal pores based on target magnetic field 基于目标磁场设计并实现具有最小孔隙的高性能微型化多层磁屏蔽球壳

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Defence Technology(防务技术) Pub Date : 2025-03-01 DOI: 10.1016/j.dt.2024.09.005

Wanqing Li , Wei Li , Shaotao Qu , Shuyi Zhang , Jingyang Xu

{"title":"Design and implementation of a high-performance miniaturized multi-layer magnetic shielding spherical shell with minimal pores based on target magnetic field","authors":"Wanqing Li , Wei Li , Shaotao Qu , Shuyi Zhang , Jingyang Xu","doi":"10.1016/j.dt.2024.09.005","DOIUrl":"10.1016/j.dt.2024.09.005","url":null,"abstract":"<div><div>Achieving the spin-exchange relaxation-free (SERF) state in atomic comagnetometers (ACMs) necessitates a stable and weak magnetic environment. This paper presents the design of a miniaturized permalloy magnetic shielding spherical shell (MSSS) with minimal apertures, tailored to meet these requirements. By employing a combination of analytical solutions and finite element analysis (FEA), we achieved superior magnetic shielding while maintaining a compact form factor. The analytical solution for the shielding factor indicated that a four-layer permalloy sphere shell with optimized air gaps was necessary. A numerical analysis model of the MSSS was developed and validated using COMSOL software, confirming the suitability of the air gaps. The size, shape, and orientation of the openings in the perforated sphere shell were meticulously designed and optimized to minimize residual magnetism. The optimal structure was fabricated, resulting in triaxial shielding factors of 47619, 52631, and 21739, meeting the anticipated requirements. A comparison of simulation results with experimental tests demonstrated the efficacy of the design methodology. This study has significant implications for ultra-sensitive magnetic field detection devices requiring weak magnetic field environments, such as atomic gyroscopes, magnetometers, atomic interferometers, and atomic clocks.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"45 ","pages":"Pages 99-108"},"PeriodicalIF":5.0,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143620439","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Research status of high efficiency deep penetration welding of medium-thick plate titanium alloy: A review 中厚板钛合金高效深熔透焊接的研究现状：综述

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Defence Technology(防务技术) Pub Date : 2025-03-01 DOI: 10.1016/j.dt.2024.08.004

Zhihai Dong , Ye Tian , Long Zhang , Tong Jiang , Dafeng Wang , Yunlong Chang , Donggao Chen

引用次数: 0

Preparation of spherical HMX@PDA-based PBX by co-axial droplet microfluidic technology: Enhancing the interfacial effect and safety performance of composite microspheres

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Defence Technology(防务技术) Pub Date : 2025-03-01 DOI: 10.1016/j.dt.2024.10.010

Yunyan Guo , Yi Liu , Jiani Xie , Jiawei Li , Fan Wang , Jinshan Lei , Chongwei An , Zhongliang Ma , Bidong Wu

{"title":"Preparation of spherical HMX@PDA-based PBX by co-axial droplet microfluidic technology: Enhancing the interfacial effect and safety performance of composite microspheres","authors":"Yunyan Guo , Yi Liu , Jiani Xie , Jiawei Li , Fan Wang , Jinshan Lei , Chongwei An , Zhongliang Ma , Bidong Wu","doi":"10.1016/j.dt.2024.10.010","DOIUrl":"10.1016/j.dt.2024.10.010","url":null,"abstract":"<div><div>Surface engineering plays a crucial role in improving the performance of high energy materials, and polydopamine (PDA) is widely used in the field of energetic materials for surface modification and functionalization. In order to obtain high-quality HMX@PDA-based PBX explosives with high sphericity and a narrow particle size distribution, composite microspheres were prepared using co-axial droplet microfluidic technology. The formation mechanism, thermal behavior, mechanical sensitivity, electrostatic spark sensitivity, compressive strength, and combustion performance of the microspheres were investigated. The results show that PDA can effectively enhance the interfacial interaction between the explosive particles and the binder under the synergistic effect of chemical bonds and the physical \"mechanical interlocking\" structure. Interface reinforcement causes the thermal decomposition temperature of the sample microspheres to move to a higher temperature, with the sensitivity to impact, friction, and electrostatic sparks (for S-1) increasing by 12.5%, 31.3%, and 81.5% respectively, and the compressive strength also increased by 30.7%, effectively enhancing the safety performance of the microspheres. Therefore, this study provides an effective and universal strategy for preparing high-quality functional explosives, and also provides some reference for the safe use of energetic materials in practical applications.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"45 ","pages":"Pages 73-83"},"PeriodicalIF":5.0,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143620437","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ballistic response mechanism and resistance-driven evaluation method of UHMWPE composite 超高分子量聚乙烯复合材料的弹道响应机制和阻力驱动评估方法

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Defence Technology(防务技术) Pub Date : 2025-02-01 DOI: 10.1016/j.dt.2024.06.007

Yemao He , Johnny Qing Zhou , Yanan Jiao , Hongshuai Lei , Zeang Zhao , Daining Fang

{"title":"Ballistic response mechanism and resistance-driven evaluation method of UHMWPE composite","authors":"Yemao He , Johnny Qing Zhou , Yanan Jiao , Hongshuai Lei , Zeang Zhao , Daining Fang","doi":"10.1016/j.dt.2024.06.007","DOIUrl":"10.1016/j.dt.2024.06.007","url":null,"abstract":"<div><div>The use of ultra-high molecular weight polyethylene (UHMWPE) composite in the design of lightweight protective equipment, has gained a lot of interest. However, there is an urgent need to understand the ballistic response mechanism and theoretical prediction model of performance. This paper explores the ballistic response mechanism of UHMWPE composite through experimental and simulation analyses. Then, a resistance-driven modeling method was proposed to establish a theoretical model for predicting the bulletproof performance. The ballistic response mechanism of UHMWPE composite encompassed three fundamental modes: local response, structural response, and coupled response. The occurrence ratio of these fundamental response modes during impact was dependent on the projectile velocity and laminate thickness. The bulletproof performance of laminate under different response modes was assessed based on the penetration depth of the projectile, the bulging height on the rear face of the laminate, the thickness of remaining sub-laminate, and residual velocity of the projectile. The absolute deviations of bulletproof performance indicator between theoretical value and experimental value were well within 11.13%, demonstrating that the established evaluation model possessed high degree of prediction accuracy.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"44 ","pages":"Pages 1-16"},"PeriodicalIF":5.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141408691","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An efficient and accurate numerical method for simulating close-range blast loads of cylindrical charges based on neural network

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Defence Technology(防务技术) Pub Date : 2025-02-01 DOI: 10.1016/j.dt.2024.10.001

Ting Liu , Changhai Chen , Han Li , Yaowen Yu , Yuansheng Cheng

{"title":"An efficient and accurate numerical method for simulating close-range blast loads of cylindrical charges based on neural network","authors":"Ting Liu , Changhai Chen , Han Li , Yaowen Yu , Yuansheng Cheng","doi":"10.1016/j.dt.2024.10.001","DOIUrl":"10.1016/j.dt.2024.10.001","url":null,"abstract":"<div><div>To address the problems of low accuracy by the CONWEP model and poor efficiency by the Coupled Eulerian-Lagrangian (CEL) method in predicting close-range air blast loads of cylindrical charges, a neural network-based simulation (NNS) method with higher accuracy and better efficiency was proposed. The NNS method consisted of three main steps. First, the parameters of blast loads, including the peak pressures and impulses of cylindrical charges with different aspect ratios (<em>L</em>/<em>D</em>) at different stand-off distances and incident angles were obtained by two-dimensional numerical simulations. Subsequently, incident shape factors of cylindrical charges with arbitrary aspect ratios were predicted by a neural network. Finally, reflected shape factors were derived and implemented into the subroutine of the ABAQUS code to modify the CONWEP model, including modifications of impulse and overpressure. The reliability of the proposed NNS method was verified by related experimental results. Remarkable accuracy improvement was acquired by the proposed NNS method compared with the unmodified CONWEP model. Moreover, huge efficiency superiority was obtained by the proposed NNS method compared with the CEL method. The proposed NNS method showed good accuracy when the scaled distance was greater than 0.2 m/kg<sup>1/3</sup>. It should be noted that there is no need to generate a new dataset again since the blast loads satisfy the similarity law, and the proposed NNS method can be directly used to simulate the blast loads generated by different cylindrical charges. The proposed NNS method with high efficiency and accuracy can be used as an effective method to analyze the dynamic response of structures under blast loads, and it has significant application prospects in designing protective structures.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"44 ","pages":"Pages 257-271"},"PeriodicalIF":5.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143436886","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

HTEC foot: A novel foot structure for humanoid robots combining static stability and dynamic adaptability

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Defence Technology(防务技术) Pub Date : 2025-02-01 DOI: 10.1016/j.dt.2024.08.010

Jintao Zhang , Xuechao Chen , Zhangguo Yu , Lianqiang Han , Zhifa Gao , Qingrui Zhao , Gao Huang , Ke Li , Qiang Huang

{"title":"HTEC foot: A novel foot structure for humanoid robots combining static stability and dynamic adaptability","authors":"Jintao Zhang , Xuechao Chen , Zhangguo Yu , Lianqiang Han , Zhifa Gao , Qingrui Zhao , Gao Huang , Ke Li , Qiang Huang","doi":"10.1016/j.dt.2024.08.010","DOIUrl":"10.1016/j.dt.2024.08.010","url":null,"abstract":"<div><div>Passive bionic feet, known for their human-like compliance, have garnered attention for their potential to achieve notable environmental adaptability. In this paper, a method was proposed to unifying passive bionic feet static supporting stability and dynamic terrain adaptability through the utilization of the Rigid-Elastic Hybrid (REH) dynamics model. First, a bionic foot model, named the Hinge Tension Elastic Complex (HTEC) model, was developed by extracting key features from human feet. Furthermore, the kinematics and REH dynamics of the HTEC model were established. Based on the foot dynamics, a nonlinear optimization method for stiffness matching (NOSM) was designed. Finally, the HTEC-based foot was constructed and applied onto BHR-B2 humanoid robot. The foot static stability is achieved. The enhanced adaptability is observed as the robot traverses square steel, lawn, and cobblestone terrains. Through proposed design method and structure, the mobility of the humanoid robot is improved.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"44 ","pages":"Pages 30-51"},"PeriodicalIF":5.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143436946","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Flow field distribution and overpressure characteristics inside the crew compartment of a truck-mounted howitzer under the effect of muzzle blast

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Defence Technology(防务技术) Pub Date : 2025-02-01 DOI: 10.1016/j.dt.2024.09.008

Shengcheng Wei , Linfang Qian , Yadong Xu , Qiang Yin , Xinyu Xiong

{"title":"Flow field distribution and overpressure characteristics inside the crew compartment of a truck-mounted howitzer under the effect of muzzle blast","authors":"Shengcheng Wei , Linfang Qian , Yadong Xu , Qiang Yin , Xinyu Xiong","doi":"10.1016/j.dt.2024.09.008","DOIUrl":"10.1016/j.dt.2024.09.008","url":null,"abstract":"<div><div>The muzzle blast overpressure induces disturbances in the flow field inside the crew compartment (FFICC) of a truck-mounted howitzer during the artillery firing. This overpressure is the primary factor preventing personnel from firing artillery within the cab. To investigate the overpressure characteristics of the FFICC, a foreign trade equipment model was used as the research object, and a numerical model was established to analyze the propagation of muzzle blast from the muzzle to the interior of the crew compartment under extreme firing condition. For comparative verification, the muzzle blast experiment included overpressure data from both the flow field outside the crew compartment (FFOCC) and the FFICC, as well as the acceleration data of the crew compartment structure (Str-CC). The research findings demonstrate that the overpressure–time curves of the FFICC exhibit multi-peak characteristics, while the pressure wave shows no significant discontinuity. The enclosed nature of the cab hinders the dissipation of pressure wave energy within the FFICC, leading to sustained high-amplitude overpressure. The frame-skin structure helps attenuate the impact of muzzle blast on the FFICC. Conversely, local high overpressure caused by the convex or concave features of the cab's exterior significantly amplifies the overpressure amplitude within the FFICC.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"44 ","pages":"Pages 190-205"},"PeriodicalIF":5.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143436882","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental study on the buckling of composite cylinders with reinforced circular hole under hydrostatic pressure

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Defence Technology(防务技术) Pub Date : 2025-02-01 DOI: 10.1016/j.dt.2024.10.002

Zhun Li , Xinhu Zhang , Kechun Shen , Jing Liu , Jian Zhang , Guang Pan

{"title":"Experimental study on the buckling of composite cylinders with reinforced circular hole under hydrostatic pressure","authors":"Zhun Li , Xinhu Zhang , Kechun Shen , Jing Liu , Jian Zhang , Guang Pan","doi":"10.1016/j.dt.2024.10.002","DOIUrl":"10.1016/j.dt.2024.10.002","url":null,"abstract":"<div><div>In this paper, a type of reinforcing structure for composite shell with single and through hole is presented. The experimental tests for the composite shells without hole, with single hole and reinforced structure, with through hole and reinforced structure subjected to hydrostatic pressure were carried out by the designed experimental test system. The mechanical responses of the composite shells under hydrostatic pressure are obtained by the high-speed camera and strain measurement. The results show that the entire deformation process of the shell can be divided into three: uniform compression, \"buckling mode formation\" and buckling. The \"buckling mode formation\" process is captured and reported for the first time. For the composite shell with single hole, the proposed reinforcing structure has a significant reinforcement effect on the shell and the buckling capacity of the shell is not weaker than the complete composite shell. For the composite shell with through hole, sealing effect can be achieved by the proposed reinforcing structure, but the buckling capacity of the shell after reinforcement can only reach 77% of the original buckling capacity.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"44 ","pages":"Pages 231-247"},"PeriodicalIF":5.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143436885","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0