Engineering Science and Technology-An International Journal-Jestech最新文献

{"title":"Development of a fully prefabricated subway station using scale experimental modeling","authors":"Shupeng Wang ,&nbsp;Weigang Zhao ,&nbsp;Song Gao ,&nbsp;Kaize Xie ,&nbsp;Xianli Ding ,&nbsp;Juyang Wu","doi":"10.1016/j.jestch.2025.102181","DOIUrl":"10.1016/j.jestch.2025.102181","url":null,"abstract":"<div><div>The widespread adoption of prefabricated structures faces two critical challenges: ensuring reliable connection performance while maintaining assembly efficiency, and meeting the stringent precision requirements for mechanical connectors during installation. To address these issues, this study develops an innovative steel connector mechanical system for prefabricated subway stations and establishes a comprehensive evaluation methodology integrating assembly process simulation with structural performance assessment. Through scaled model tests combining static and cyclic pushover loading, the research demonstrates that the proposed connector successfully reconciles assembly efficiency with structural reliability, showing minimal displacement during assembly and substantial load-bearing capacity in service conditions. The prefabricated system exhibits excellent seismic performance through a controlled yield mechanism where localized damage at frame corners protects critical joints, maintaining structural integrity up to interstory drift ratios exceeding the limit of 1/250 specified by the Chinese code GB 50909–2014. These findings provide both a validated technical solution and a systematic evaluation framework for advancing prefabricated underground construction.</div></div>","PeriodicalId":48609,"journal":{"name":"Engineering Science and Technology-An International Journal-Jestech","volume":"71 ","pages":"Article 102181"},"PeriodicalIF":5.4,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145119165","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A cost-effective embeddable algorithm for accelerometer-based fall detector","authors":"Abdullah Talha Sözer","doi":"10.1016/j.jestch.2025.102185","DOIUrl":"10.1016/j.jestch.2025.102185","url":null,"abstract":"<div><div>Falls, often causing injuries in older individuals, involve an unintentional descent to a lower level, like the ground. With the aging global population, addressing fall risks is crucial. Besides falls, delayed medical services post-fall may cause secondary complications. Automated fall detection (FD) systems can promptly identify falls and alert responders. Among automated FD systems, wearable sensor-based ones seem most viable for widespread use. These effectively distinguish falls from daily activities using machine learning techniques. However, their high computational complexity increases power consumption, requires powerful processors, and consequently raises costs. This underscores the need for affordable, embeddable algorithms. Developing highly accurate embeddable algorithms with manageable computational costs remains a current research challenge. This study introduces an algorithm tailored specifically for embedded systems, focusing on ease of implementation and reliance solely on accelerometer data. Empowered by a novel feature, the algorithm integrates thresholding and machine learning techniques, resulting in low computational complexity while maintaining highly effective FD capabilities. Evaluations of the algorithm on comprehensive public fall datasets, KFall and SisFall, demonstrate accuracies exceeding 99% and 97%, respectively. Furthermore, validation on real-world fall events from the FARSEEING dataset yielded an accuracy of 77.3%. Additionally, the proposed algorithm underwent real-time offline analysis on a low-power embedded device. The computational complexity of the proposed method is assessed by comparing it with another low-cost algorithm. Comparative evaluations against a low-cost algorithm, deep learning-based methods, and findings from the literature emphasize the superior performance and cost-effectiveness of this algorithm. Furthermore, the algorithm’s robustness is confirmed through testing at various sampling frequencies, highlighting its ability to achieve successful FD independent of sampling frequency.</div></div>","PeriodicalId":48609,"journal":{"name":"Engineering Science and Technology-An International Journal-Jestech","volume":"71 ","pages":"Article 102185"},"PeriodicalIF":5.4,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145097393","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fabrication, encapsulation, and hysteresis creep mitigation in Ionic Polymer-Metal Composites: A review","authors":"Lin Zhang ,&nbsp;Tingting Peng ,&nbsp;Yongshi Song ,&nbsp;Yandong Li ,&nbsp;Yanzheng Zhao","doi":"10.1016/j.jestch.2025.102179","DOIUrl":"10.1016/j.jestch.2025.102179","url":null,"abstract":"<div><div>This systematic review examines the preparation and encapsulation processes for Ionic Polymer-Metal Composites (IPMCs) and evaluates methods for suppressing their characteristic hysteresis and creep. The analysis investigates the relationship between various base membrane and electrode preparation techniques, including their optimization approaches, and the resulting mechanical properties of IPMCs. Additionally, the review categorizes and compares conventional encapsulation techniques according to their fundamental processes and application scenarios. Persistent hysteresis and creep phenomena have significantly constrained the long-term development of IPMCs. While classical modeling approaches have been applied to address these issues, they often fall short in effectively characterizing IPMC behavior. Recently, data-driven methodologies, particularly deep learning techniques, have emerged as promising alternatives for improving modeling accuracy of IPMC hysteresis and creep. Accordingly, this review compiles and analyzes current data-driven suppression methods. The paper concludes with insights into future development pathways for IPMCs within smart materials and soft robotics applications. By synthesizing existing research, this work provides a comprehensive foundation to advance IPMC technology and enhance its practical performance capabilities.</div></div>","PeriodicalId":48609,"journal":{"name":"Engineering Science and Technology-An International Journal-Jestech","volume":"71 ","pages":"Article 102179"},"PeriodicalIF":5.4,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145049872","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Rotational symmetric metamaterial structure of emblemed number connected with continuous transmission line for EM wave shielding applications","authors":"Md. Ismail Hossen ,&nbsp;Saif Hannan ,&nbsp;Mohammad Tariqul Islam ,&nbsp;Abdulmajeed M. Alenezi ,&nbsp;Mohamed S. Soliman","doi":"10.1016/j.jestch.2025.102200","DOIUrl":"10.1016/j.jestch.2025.102200","url":null,"abstract":"<div><div>Electromagnetic (EM) wave shielding in modern wireless systems encounters critical challenges, including polarization insensitivity, broadband operation, and compact design requirements. This work introduces a rotationally symmetric metamaterial absorber featuring emblem-shaped continuous transmission line resonators, specifically engineered to achieve high-efficiency absorption across the C, X, and Ku bands. The proposed design demonstrates remarkable absorption rates of 96.77 %, 99.68 %, 99.68 %, 99.70 %, 98.03 %, 99.68 %, and 99.98 % at resonance frequencies of 5.834 GHz, 7.192 GHz, 7.766 GHz, 10.65 GHz, 14.038 GHz, 15.34 GHz, and 15.62 GHz, respectively. Benefiting from rotational symmetry, the absorber maintains complete insensitivity to both co- and cross-polarized incident waves, with stable performance under oblique angles up to 90°. A maximum shielding effectiveness of 78 dB is achieved at the targeted frequencies, ensuring robust protection against EM interference. The compact unit cell (0.233λ × 0.233λ) exhibits near-zero permittivity, permeability, and refractive index with single-negative properties, further supporting efficient absorption within a minimal footprint. To validate the physical behavior, an equivalent RLC circuit model was developed in ADS, showing excellent agreement with CST simulations. Experimental verification using fabricated prototypes and Vector Network Analyzer measurements confirms the strong consistency between simulated and measured results. The novelty of this work lies in the integration of an emblem-shaped resonator with a continuous transmission line in a rotationally symmetric layout, enabling broadband absorption, polarization, and angle insensitivity, as well as high shielding effectiveness within a compact geometry. These features make the proposed absorber highly suitable for Wi-Fi, 5G, aerospace, defense radar, and stealth EM shielding applications.</div></div>","PeriodicalId":48609,"journal":{"name":"Engineering Science and Technology-An International Journal-Jestech","volume":"71 ","pages":"Article 102200"},"PeriodicalIF":5.4,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145267452","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Energy-efficient operation diagram optimization for high-speed trains considering energy storage device deployment","authors":"Yuzhao Zhang ,&nbsp;Shenyingze Gao ,&nbsp;Xuan Ji","doi":"10.1016/j.jestch.2025.102197","DOIUrl":"10.1016/j.jestch.2025.102197","url":null,"abstract":"<div><div>This study proposes an energy-efficient operation diagram optimization method for high-speed trains considering the deployment of energy storage devices. A hybrid PSO-SA algorithm is developed to solve the model, incorporating constraints such as departure times, dwell durations, and safety headways. Validated on the Baoji-Lanzhou section, results demonstrate an immediate regenerative energy utilization rate of 47.26 %, rising to 62.79 % with energy storage deployment. The hybrid algorithm reduces computation time by 74.59 % compared to traditional SA algorithm while maintaining solution quality. Compared with the GA algorithm, the optimal result obtained by the PSO-SA algorithm improved by 4.76 %. Economic analysis highlights prioritizing storage deployment in key power supply zones for optimal cost-effectiveness, offering actionable strategies for sustainable railway operations. This research provides theoretical and practical insights into energy-efficient high-speed rail systems.</div></div>","PeriodicalId":48609,"journal":{"name":"Engineering Science and Technology-An International Journal-Jestech","volume":"71 ","pages":"Article 102197"},"PeriodicalIF":5.4,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145119166","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Design of SynRM and PMaSynRM using a common industrial stator platform: a new design methodology for transition from industrial applications to electric vehicles","authors":"Sinan Suli ,&nbsp;Yasemin Öner ,&nbsp;İbrahim Şenol","doi":"10.1016/j.jestch.2025.102204","DOIUrl":"10.1016/j.jestch.2025.102204","url":null,"abstract":"<div><div>This study presents a design methodology for synchronous reluctance (SynRM) and permanent magnet-assisted synchronous reluctance motors (PMaSynRM), developed through rotor lamination optimizations without altering the existing stator platform. This approach enables the realization of different motor types using a common stator, eliminating the need for additional tooling costs in the production line. It is based on the principle of “Efficiency Class Upgrade with Minimum Die Cost”, whereby the existing tooling infrastructure is preserved, and higher-efficiency motors are prototyped at low cost through topological modifications in the rotor design.</div><div>Using a multi-objective genetic algorithm (MOGA), rotor designs were optimized to achieve Pareto-optimal solutions among conflicting targets such as torque production, efficiency, magnet volume, and torque ripple. The electromagnetic performance of rotor geometries was assessed via 2D finite element analysis (FEA), providing flux distribution, torque profiles, and efficiency curves.</div><div>A reference IE2-class induction motor (IM) was used as the baseline, upon which SynRM and PMaSynRM models were designed using the same stator. These three motor types were comparatively analyzed, along with a dimensional-level comparison against the IE4 version of the same motor. Throughout the process, the stator geometry, slot structure, and winding features remained unchanged, ensuring design novelty through rotor-side innovations.</div><div>The results demonstrate the electromagnetic potential and structural compatibility of SynRM and PMaSynRM configurations with the existing stator. The proposed method offers a scalable and cost-effective solution for manufacturers aiming to adopt high-efficiency motor technologies, paving a transition path from industrial motors to electric vehicle (EV) applications via a unified stator platform.</div><div>This study is limited to an IE2-class, frame-90, four-pole squirrel-cage IM stator reference; applying the methodology to other frame sizes and pole counts requires re-parameterization. From a practical standpoint, redesigning only the rotor eliminates stator/winding tooling costs, enabling efficiency-class upgrades and making the approach suitable for rapid industrial adoption. From a social perspective, higher efficiency and reduced dependence on rare-earth materials contribute to energy savings and supply-chain sustainability.</div></div>","PeriodicalId":48609,"journal":{"name":"Engineering Science and Technology-An International Journal-Jestech","volume":"71 ","pages":"Article 102204"},"PeriodicalIF":5.4,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145321447","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Medical image zero-watermarking algorithm based on a reversible integer quaternionic Meixner transform and a hybrid chaotic system","authors":"Adil Sayyouri ,&nbsp;Karim El-khanchouli ,&nbsp;Ahmed Bencherqui ,&nbsp;Hicham Karmouni ,&nbsp;Mhamed Sayyouri ,&nbsp;Abderrahim Bourkane ,&nbsp;Abdeljabbar Cherkaoui ,&nbsp;Doaa Sami Khafaga ,&nbsp;Eman Abdullah Aldakheel","doi":"10.1016/j.jestch.2025.102180","DOIUrl":"10.1016/j.jestch.2025.102180","url":null,"abstract":"<div><div>The protection of medical images, often transmitted over unsecured networks in telemedicine contexts, requires techniques that ensure data confidentiality, integrity, and reversibility. To meet these requirements, we introduce a novel reversible and integer-based transform called the Quaternionic Integer Reversible Meixner Transform (QIRMT). This method enables a compact and accurate representation of multidimensional data 1D, 2D and 3D, while guaranteeing lossless reconstruction (MSE = 0, PSNR = ∞), thereby overcoming the numerical limitations of classical Meixner moments. Based on QIRMT, we have designed a robust zero-watermarking scheme for the authentication of medical images. This approach combines the extraction of features via QIRMT with a chaotic hybrid system by logistic-sine map and a generalized Arnold transform to ensure secure scrambling and spatial dispersion of the watermark-without altering the original image. Experimental results on benchmark medical images demonstrate high robustness against geometric and image processing attacks (BER &lt; 0.03; NC &gt; 0.97), even under combined distortions such as noise, JPEG compression, cropping, and rotation. Moreover, the proposed scheme achieves a significantly reduced execution time, outperforming existing comparative methods. These results confirm that the proposed method offers a reliable, efficient, and practical solution for protecting sensitive medical imaging data, in line with the stringent requirements of modern healthcare and telemedicine systems.</div></div>","PeriodicalId":48609,"journal":{"name":"Engineering Science and Technology-An International Journal-Jestech","volume":"71 ","pages":"Article 102180"},"PeriodicalIF":5.4,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145049875","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"NCRDAP: An AI-driven clustering routing and data aggregation protocol for energy-efficient wireless sensor networks","authors":"MD Jiabul Hoque ,&nbsp;Md. Saiful Islam ,&nbsp;Istiaque Ahmed","doi":"10.1016/j.jestch.2025.102184","DOIUrl":"10.1016/j.jestch.2025.102184","url":null,"abstract":"<div><div>Wireless Sensor Networks (WSNs) play a pivotal role in numerous Internet of Things (IoT) applications; however, their performance remains constrained by limited energy resources, inefficient clustering, suboptimal routing, and redundant data transmissions. To address these persistent challenges, this study hypothesizes that integrating intelligent optimization techniques can simultaneously improve energy efficiency, network longevity, and data reliability in WSNs. Accordingly, we propose a novel AI-driven framework titled Neural-optimized Clustering, Routing, and Data Aggregation Protocol (NCRDAP). The framework combines an Artificial Neural Network (ANN)-based Cluster Head (CH) selection mechanism, an enhanced Quantum Particle Swarm Optimization (QPSO) for multi-hop routing, and a dual-step data aggregation strategy using edge computing to reduce redundancy and minimize communication overhead. The methodology was implemented and evaluated through extensive simulations using MATLAB R2022a, incorporating widely accepted radio energy models and comparative benchmarks including Low Energy Adaptive Clustering Hierarchy (LEACH), LEACH-Centralized (LEACH-C), LEACH with Genetic Algorithm (LEACH-GA), Cluster-Based Data Aggregation (CBDA), Power-efficient and Scalable Adaptive Network (PSAN), and Energy-aware Network Selection (ENS) protocols. The experimental results demonstrate that NCRDAP extends network lifetime by 19–23 %, enhances throughput by 20–30 %, and reduces overall energy consumption and packet loss ratio compared to existing techniques. Furthermore, QPSO exhibited faster convergence behavior and superior routing efficiency, while the dual-step edge processing strategy significantly reduced redundant transmissions without imposing substantial computational overhead. These findings confirm that the proposed NCRDAP framework offers a scalable, energy-efficient, and reliable solution for real-time, resource-constrained WSN applications.</div></div>","PeriodicalId":48609,"journal":{"name":"Engineering Science and Technology-An International Journal-Jestech","volume":"71 ","pages":"Article 102184"},"PeriodicalIF":5.4,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145097406","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Handover management for UAV communication in 5G networks: A systematic literature review","authors":"Azita Laily Yusof,&nbsp;Ahmad Zaki Aiman Abdul Rashid,&nbsp;Darmawaty Mohd Ali","doi":"10.1016/j.jestch.2025.102198","DOIUrl":"10.1016/j.jestch.2025.102198","url":null,"abstract":"<div><div>Within the last ten years, UAVs has captured both the academia’s and industry players attention due to their capabilities to be utilized in multiple applications. One of the most prominent functionalities that UAVs provided for multiple applications is communication. Due to these functionalities, UAVs are seen as a major player in the 5G/6G cellular networks. Extending the connectivity and communication through multiple devices is the main goal of the 5G/6G networks. In this context, UAVs can either be deployed as relays that receive signals from BS and transmit them to the UE, or the UAVs can be utilized as a BS that flies (UAV-BS) and supplies 5G/6G communication to the UEs on the ground. However, there are many issues that arise with UAV communication networks when trying to provide signal coverage to users. One of the issues is when utilizing UAV as a BS, the signal coverage’s quality might not be up to par due to the UAV’s high mobility characteristics, which also leads to the frequent handover experienced by the users on the ground. Frequent handovers, or “ping-pong” handovers, are not acceptable and can instigate other problems that reduce the quality of the signal, such as packet delays, or losses of packets. Efficient handover management in drone communication is the solution to this problem, and, thus, it requires to be applied to the UAV networks to sustain connectivity that is reliable and stable. This paper studies the handover management for UAV communication in 5G networks using the systematic literature review (SLR) technique for its methodology. Multiple topics related to the handover scenario in the UAV networks are being highlighted in this paper, alongside studies related to machine learning (ML) usage in making handover decisions. A total of 90 research papers that relate to the handover in UAV networks and that were published from 2019 to 2024 were chosen. The results from our studies show that machine learning is able to provide handover decision that are more efficient and robust than traditional/conventional methods of making handover decisions. Finally, several discussions based on several themes and the limitations of the studies were held.</div></div>","PeriodicalId":48609,"journal":{"name":"Engineering Science and Technology-An International Journal-Jestech","volume":"71 ","pages":"Article 102198"},"PeriodicalIF":5.4,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145159523","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A comprehensive review and prospect of transient damping methods for grid-forming virtual synchronous generator","authors":"Rongliang Shi ,&nbsp;Junming Li ,&nbsp;Xing Zhang ,&nbsp;Junhui Li ,&nbsp;Zheng Dong","doi":"10.1016/j.jestch.2025.102196","DOIUrl":"10.1016/j.jestch.2025.102196","url":null,"abstract":"<div><div>Transient damping has emerged as a key technique for mitigating active power oscillations in grid-forming virtual synchronous generator (GFVSG) systems, whether operating in grid-connected or parallel configurations. This study first elucidates the operating principles and primary functions of transient damping within GFVSG control, drawing on the electromechanical analogy and an energy reconstruction perspective. Typical transient damping approaches are then classified, followed by the proposal of a systematic parameter design strategy and an evaluation of their dynamic performance. Building on the limitations of existing research, this work contributes by identifying the research prospects, highlighting critical technical challenges, and suggesting structured pathways for further improvement. Finally, the paper provides a comprehensive synthesis intended to deepen understanding of the advantages and limitations of transient damping control in GFVSGs, while offering theoretical insights to support sustained advances in this field.</div></div>","PeriodicalId":48609,"journal":{"name":"Engineering Science and Technology-An International Journal-Jestech","volume":"71 ","pages":"Article 102196"},"PeriodicalIF":5.4,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145097407","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}