Defence Technology(防务技术)最新文献_第6页

Investigation of mixing performance and safety characteristics of polymer-based energetic materials simulant via screw-pressing blending extrusion charges 基于螺杆挤压混炼料的高分子含能材料模拟料混炼性能及安全特性研究

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Defence Technology(防务技术) Pub Date : 2025-02-01 DOI: 10.1016/j.dt.2024.10.008

Gaoming Lin , Huzeng Zong , Suwei Wang , Huang Chen , Siyu Yu , Xiaojie Hao , Kang Wang , Yuanyuan Li , Guohui Zhang

{"title":"Investigation of mixing performance and safety characteristics of polymer-based energetic materials simulant via screw-pressing blending extrusion charges","authors":"Gaoming Lin , Huzeng Zong , Suwei Wang , Huang Chen , Siyu Yu , Xiaojie Hao , Kang Wang , Yuanyuan Li , Guohui Zhang","doi":"10.1016/j.dt.2024.10.008","DOIUrl":"10.1016/j.dt.2024.10.008","url":null,"abstract":"<div><div>The present study introduces a screw-pressing charging method to tackle deficiencies in automation and charge uniformity during the melt-casting of polymer-based energetic materials. To ensure the safety of the experiments, this study used inert materials with similar physical properties to partially substitute for the actual energetic components in the preparation of simulant materials. By thoroughly analyzing slurry physical properties, a simulation framework and an extensive performance evaluation method were developed. Such tools guide the design of the structure and configuration of process parameters. Results demonstrate that employing the Pin element significantly enhances radial mixing within the screw, minimizes temperature variations in the slurry, and improves both efficiency and safety in the mixing process. Further, adjustments such as widening the cone angle of the barrel, modifying the solid content of the slurry, and varying the speed of the screw can optimize the mechanical and thermal coupling in the flow field. These adjustments promote higher-quality slurry and create a safer production environment for the extrusion process.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"44 ","pages":"Pages 287-305"},"PeriodicalIF":5.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143436953","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

Mode-switching cooperative defense strategy for the orbit pursuit-evasion-defense game 轨道追逐-逃避-防御博弈的模式切换合作防御策略

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Defence Technology(防务技术) Pub Date : 2025-02-01 DOI: 10.1016/j.dt.2024.10.006

Yongshang Wei, Tianxi Liu, Cheng Wei

{"title":"Mode-switching cooperative defense strategy for the orbit pursuit-evasion-defense game","authors":"Yongshang Wei, Tianxi Liu, Cheng Wei","doi":"10.1016/j.dt.2024.10.006","DOIUrl":"10.1016/j.dt.2024.10.006","url":null,"abstract":"<div><div>This paper presents a mode-switching collaborative defense strategy for spacecraft pursuit-evasion-defense scenarios. In these scenarios, the pursuer tries to avoid the defender while capturing the evader, while the evader and defender form an alliance to prevent the pursuer from achieving its goal. First, the behavioral modes of the pursuer, including attack and avoidance modes, were established using differential game theory. These modes are then recognized by an interactive multiple model-matching algorithm (IMM), that uses several smooth variable structure filters to match the modes of the pursuer and update their probabilities in real time. Based on the linear-quadratic optimization theory, combined with the results of strategy identification, a two-way cooperative optimal strategy for the defender and evader is proposed, where the evader aids the defender to intercept the pursuer by performing luring maneuvers. Simulation results show that the interactive multi-model algorithm based on several smooth variable structure filters perform well in the strategy identification of the pursuer, and the cooperative defense strategy based on strategy identification has good interception performance when facing pursuers, who are able to flexibly adjust their game objectives.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"44 ","pages":"Pages 272-286"},"PeriodicalIF":5.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143436952","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

A novel transient strategy: transient electronics based on energetic materials 新型瞬态战略：基于高能材料的瞬态电子器件

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Defence Technology(防务技术) Pub Date : 2025-02-01 DOI: 10.1016/j.dt.2024.04.013

Yutao Wang , Zhongliang Ma , Wei He , Yongli Zhang , Peijin Liu

引用次数: 0

Synthesis of energetic materials by microfluidics 利用微流体技术合成高能材料

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Defence Technology(防务技术) Pub Date : 2025-02-01 DOI: 10.1016/j.dt.2024.06.002

Shuo Liu , Chuanyu Zhang , Yanlan Wang , Xueyong Wei

{"title":"Synthesis of energetic materials by microfluidics","authors":"Shuo Liu , Chuanyu Zhang , Yanlan Wang , Xueyong Wei","doi":"10.1016/j.dt.2024.06.002","DOIUrl":"10.1016/j.dt.2024.06.002","url":null,"abstract":"<div><div>Energetic materials, characterized by their capacity to store and release substantial energy, hold pivotal significance in some fields, particularly in defense applications. Microfluidics, with its ability to manipulate fluids and facilitate droplet formation at the microscale, enables precise control of chemical reactions. Recent scholarly endeavors have increasingly harnessed microfluidic reactors in the realm of energetic materials, yielding morphologically controllable particles with enhanced uniformity and explosive efficacy. However, crucial insights into microfluidic-based methodologies are dispersed across various publications, necessitating a systematic compilation. Accordingly, this review addresses this gap by concentrating on the synthesis of energetic materials through microfluidics. Specifically, the methods based on micro-mixing and droplets in the previous papers are summarized and the strategies to control the critical parameters within chemical reactions are discussed in detail. Then, the comparison in terms of advantages and disadvantages is attempted. As demonstrated in the last section regarding perspectives, challenges such as clogging, dead zones, and suboptimal production yields are non-ignoble in the promising fields and they might be addressed by integrating sound, optics, or electrical energy to meet heightened requirements. This comprehensive overview aims to consolidate and analyze the diverse array of microfluidic approaches in energetic material synthesis, offering valuable insights for future research directions.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"44 ","pages":"Pages 306-319"},"PeriodicalIF":5.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141399177","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

Utilizing electronic assisted enhancement: An innovative approach for studying the thermal decomposition and combustion of ionic liquids 利用电子辅助增强：一种研究离子液体热分解和燃烧的创新方法

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Defence Technology(防务技术) Pub Date : 2025-02-01 DOI: 10.1016/j.dt.2024.09.001

Cailing Zhang , Yutao Wang , Baiquan Chen , Zhenguo Pang , Hongqi Nie , Quan Zhu , Peijin Liu , Wei He

{"title":"Utilizing electronic assisted enhancement: An innovative approach for studying the thermal decomposition and combustion of ionic liquids","authors":"Cailing Zhang , Yutao Wang , Baiquan Chen , Zhenguo Pang , Hongqi Nie , Quan Zhu , Peijin Liu , Wei He","doi":"10.1016/j.dt.2024.09.001","DOIUrl":"10.1016/j.dt.2024.09.001","url":null,"abstract":"<div><div>Flammable ionic liquids exhibit high conductivity and a broad electrochemical window, enabling the generation of combustible gases for combustion via electrochemical decomposition and thermal decomposition. This characteristic holds significant implications in the realm of novel satellite propulsion. Introducing a fraction of the electrical energy into energetic ionic liquid fuels, the thermal decomposition process is facilitated by reducing the apparent activation energy required, and electrical energy can trigger the electrochemical decomposition of ionic liquids, presenting a promising approach to enhance combustion efficiency and energy release. This study applied an external voltage during the thermal decomposition of 1-ethyl-3-methylimidazole nitrate ([EMIm]NO<sub>3</sub>), revealing the effective alteration of the activation energy of [EMIm]NO<sub>3</sub>. The pyrolysis, electrochemical decomposition, and electron assisted enhancement products were identified through Thermogravimetry–Differential scanning calorimetry–Fourier transform infrared-Mass spectrometry (TG-DSC-FTIR-MS) and gas chromatography (GC) analyses, elucidating the degradation mechanism of [EMIm]NO<sub>3</sub>. Furthermore, an external voltage was introduced during the combustion of [EMIm]NO<sub>3</sub>, demonstrating the impact of voltage on the combustion process.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"44 ","pages":"Pages 179-189"},"PeriodicalIF":5.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143436870","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

A novel detection method for warhead fragment targets in optical images under dynamic strong interference environments 动态强干扰环境下光学图像中弹头碎片目标的新型检测方法

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Defence Technology(防务技术) Pub Date : 2025-01-01 DOI: 10.1016/j.dt.2024.08.008

Guoyi Zhang , Hongxiang Zhang , Zhihua Shen , Deren Kong , Chenhao Ning , Fei Shang , Xiaohu Zhang

{"title":"A novel detection method for warhead fragment targets in optical images under dynamic strong interference environments","authors":"Guoyi Zhang , Hongxiang Zhang , Zhihua Shen , Deren Kong , Chenhao Ning , Fei Shang , Xiaohu Zhang","doi":"10.1016/j.dt.2024.08.008","DOIUrl":"10.1016/j.dt.2024.08.008","url":null,"abstract":"<div><div>A measurement system for the scattering characteristics of warhead fragments based on high-speed imaging systems offers advantages such as simple deployment, flexible maneuverability, and high spatiotemporal resolution, enabling the acquisition of full-process data of the fragment scattering process. However, mismatches between camera frame rates and target velocities can lead to long motion blur tails of high-speed fragment targets, resulting in low signal-to-noise ratios and rendering conventional detection algorithms ineffective in dynamic strong interference testing environments. In this study, we propose a detection framework centered on dynamic strong interference disturbance signal separation and suppression. We introduce a mixture Gaussian model constrained under a joint spatial-temporal-transform domain Dirichlet process, combined with total variation regularization to achieve disturbance signal suppression. Experimental results demonstrate that the proposed disturbance suppression method can be integrated with certain conventional motion target detection tasks, enabling adaptation to real-world data to a certain extent. Moreover, we provide a specific implementation of this process, which achieves a detection rate close to 100% with an approximate 0% false alarm rate in multiple sets of real target field test data. This research effectively advances the development of the field of damage parameter testing.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"43 ","pages":"Pages 252-270"},"PeriodicalIF":5.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142259501","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

Discovering causal models for structural, construction and defense-related engineering phenomena 发现结构、建筑和国防相关工程现象的因果模型

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Defence Technology(防务技术) Pub Date : 2025-01-01 DOI: 10.1016/j.dt.2024.04.007

M.Z. Naser

{"title":"Discovering causal models for structural, construction and defense-related engineering phenomena","authors":"M.Z. Naser","doi":"10.1016/j.dt.2024.04.007","DOIUrl":"10.1016/j.dt.2024.04.007","url":null,"abstract":"<div><div>Causality, the science of cause and effect, has made it possible to create a new family of models. Such models are often referred to as causal models. Unlike those of mathematical, numerical, empirical, or machine learning (ML) nature, causal models hope to tie the cause(s) to the effect(s) pertaining to a phenomenon (i.e., data generating process) through causal principles. This paper presents one of the first works at creating causal models in the area of structural and construction engineering. To this end, this paper starts with a brief review of the principles of causality and then adopts four causal discovery algorithms, namely, PC (Peter-Clark), FCI (fast causal inference), GES (greedy equivalence search), and GRaSP (greedy relaxation of the sparsest permutation), have been used to examine four phenomena, including predicting the load-bearing capacity of axially loaded members, fire resistance of structural members, shear strength of beams, and resistance of walls against impulsive (blast) loading. Findings from this study reveal the possibility and merit of discovering complete and partial causal models. Finally, this study also proposes two simple metrics that can help assess the performance of causal discovery algorithms.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"43 ","pages":"Pages 60-79"},"PeriodicalIF":5.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141197772","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

Critical quality indicators of high-performance polyetherimide (ULTEM) over the MEX 3D printing key generic control parameters: Prospects for personalized equipment in the defense industry 高性能聚醚酰亚胺（ULTEM）对 MEX 3D 打印关键通用控制参数的关键质量指标：国防工业个性化设备的发展前景

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Defence Technology(防务技术) Pub Date : 2025-01-01 DOI: 10.1016/j.dt.2024.08.001

Nectarios Vidakis , Markos Petousis , Constantine David , Nektarios K. Nasikas , Dimitrios Sagris , Nikolaos Mountakis , Mariza Spiridaki , Amalia Moutsopoulou , Emmanuel Stratakis

{"title":"Critical quality indicators of high-performance polyetherimide (ULTEM) over the MEX 3D printing key generic control parameters: Prospects for personalized equipment in the defense industry","authors":"Nectarios Vidakis , Markos Petousis , Constantine David , Nektarios K. Nasikas , Dimitrios Sagris , Nikolaos Mountakis , Mariza Spiridaki , Amalia Moutsopoulou , Emmanuel Stratakis","doi":"10.1016/j.dt.2024.08.001","DOIUrl":"10.1016/j.dt.2024.08.001","url":null,"abstract":"<div><div>Additive Manufacturing (AM) can provide customized parts that conventional techniques fail to deliver. One important parameter in AM is the quality of the parts, as a result of the material extrusion 3D printing (3D-P) procedure. This can be very important in defense-related applications, where optimum performance needs to be guaranteed. The quality of the Polyetherimide 3D-P specimens was examined by considering six control parameters, namely, infill percentage, layer height, deposition angle, travel speed, nozzle, and bed temperature. The quality indicators were the root mean square (<em>R</em>q) and average (<em>R</em>a) roughness, porosity, and the actual to nominal dimensional deviation. The examination was performed with optical profilometry, optical microscopy, and micro-computed tomography scanning. The Taguchi design of experiments was applied, with twenty-five runs, five levels for each control parameter, on five replicas. Two additional confirmation runs were conducted, to ensure reliability. Prediction equations were constructed to express the quality indicators in terms of the control parameters. Three modeling approaches were applied to the experimental data, to compare their efficiency, i.e., Linear Regression Model (LRM), Reduced Quadratic Regression Model, and Quadratic Regression Model (QRM). QRM was the most accurate one, still the differences were not high even considering the simpler LRM model.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"43 ","pages":"Pages 150-167"},"PeriodicalIF":5.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142189179","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 investigation on the anti-detonation performance of composite structure containing foam geopolymer backfill material 含泡沫土工聚合物回填材料的复合结构抗爆性能实验研究

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Defence Technology(防务技术) Pub Date : 2025-01-01 DOI: 10.1016/j.dt.2024.08.011

Hang Zhou , Hujun Li , Zhen Wang , Dongming Yan , Wenxin Wang , Guokai Zhang , Zirui Cheng , Song Sun , Mingyang Wang

{"title":"Experimental investigation on the anti-detonation performance of composite structure containing foam geopolymer backfill material","authors":"Hang Zhou , Hujun Li , Zhen Wang , Dongming Yan , Wenxin Wang , Guokai Zhang , Zirui Cheng , Song Sun , Mingyang Wang","doi":"10.1016/j.dt.2024.08.011","DOIUrl":"10.1016/j.dt.2024.08.011","url":null,"abstract":"<div><div>The compression and energy absorption properties of foam geopolymers increase stress wave attenuation under explosion impacts, reducing the vibration effect on the structure. Explosion tests were conducted using several composite structure models, including a concrete lining structure (CLS) without foam geopolymer and six foam geopolymer composite structures (FGCS) with different backfill parameters, to study the dynamic response and wave dissipation mechanisms of FGCS under explosive loading. Pressure, strain, and vibration responses at different locations were synchronously tested. The damage modes and dynamic responses of different models were compared, and how wave elimination and energy absorption efficiencies were affected by foam geopolymer backfill parameters was analyzed. The results showed that the foam geopolymer absorbed and dissipated the impact energy through continuous compressive deformation under high strain rates and dynamic loading, reducing the strain in the liner structure by 52% and increasing the pressure attenuation rate by 28%. Additionally, the foam geopolymer backfill reduced structural vibration and liner deformation, with the FGCS structure showing 35% less displacement and 70% less acceleration compared to the CLS. The FGCS model with thicker, less dense foam geopolymer backfill, having more pores and higher porosity, demonstrated better compression and energy absorption under dynamic impact, increasing stress wave attenuation efficiency. By analyzing the stress wave propagation and the compression characteristics of the porous medium, it was concluded that the stress transfer ratio of FGCS-ρ-579 was 77% lower than that of CLS, and the transmitted wave energy was 90% lower. The results of this study provide a scientific basis for optimizing underground composite structure interlayer parameters.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"43 ","pages":"Pages 304-318"},"PeriodicalIF":5.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142188941","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

Study on cook-off characteristics and thermal safety venting area of RBOE charge RBOE装药烧脱特性及热安全排气面积研究

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Defence Technology(防务技术) Pub Date : 2025-01-01 DOI: 10.1016/j.dt.2024.08.016

Kebin Zhang , Wenbin Li , Changfang Zhao , Zhifang Wei , Shuxia Zhang , Jin Li

{"title":"Study on cook-off characteristics and thermal safety venting area of RBOE charge","authors":"Kebin Zhang , Wenbin Li , Changfang Zhao , Zhifang Wei , Shuxia Zhang , Jin Li","doi":"10.1016/j.dt.2024.08.016","DOIUrl":"10.1016/j.dt.2024.08.016","url":null,"abstract":"<div><div>RBOE is a new type of DNAN-based high-energy melt-cast mixed explosive, whose safety under thermal stimulation is significantly affected by heating conditions and venting area of the warhead. Based on the thermal decomposition reaction characteristics and combustion characteristics of each component of RBOE explosive, the cook-off calculation models of RBOE warhead before and after ignition were established. In addition, closed and vented warheads were designed, as well as fast and slow cook-off test devices. The cook-off characteristics and thermal safety venting area of RBOE warhead were extensively studied. The results showed that the closed RBOE warhead underwent deflagration reaction under both slow and fast cook-off conditions. The calculation result of the shell wall temperature before slow cook-off ignition response of the warhead was 454.06 K, with an error of +1.75% compared to the test result of 462.15 K, and the temperature rise rate calculated was in good agreement with the test. The calculated ignition time of RBOE warhead under fast cook-off was 161 s, with an error of +8.8% compared to the test result of 148 s, which verified the accuracy of cook-off model of RBOE warhead before ignition. According to the cook-off calculation model of the warhead after ignition and cook-off test of the vented warhead, it was determined that the thermal safety venting area was 1124.61 mm<sup>2</sup> for fast cook-off and 530.66 mm<sup>2</sup> for slow cook-off, effectively preventing the reaction of warhead above combustion. Therefore, this study provides a scientific basis for the thermal safety design and evaluation of insensitive warheads.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"43 ","pages":"Pages 271-287"},"PeriodicalIF":5.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143096841","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