检索结果-内蒙古大学图书馆

Building Information Modeling Applications in Civil Infrastructure: A Bibliometric Analysis from 2020 to 2024

BUILDINGS 2024年第11期14卷 3431-3431页

作者： Li, Yaning Li, Yongchang Ding, Zhikun Guangdong Lab Artificial Intelligence & Digital Ec Shenzhen 518060 Peoples R China Shenzhen Univ Sino Australia Joint Res Ctr BIM & Smart Construct Shenzhen 518060 Peoples R China Shenzhen Univ Key Lab Coastal Urban Resilient Infrastruct Minist Educ Shenzhen 518060 Peoples R China Shenzhen Univ Shenzhen Key Lab Green Efficient & Intelligent Construct Underground Metr Shenzhen 518060 Peoples R China

Building Information Modeling (BIM) has emerged as a transformative technology in the Architecture, Engineering, and Construction (AEC) industry, with increasing application in civil infrastructure projects. This study comprehensively reviews the research landscape of BIM applications in civil infrastructure through bibliometric analysis. Based on data from the Web of science database, 646 relevant papers published between 2020 and 2024 were collected, and 416 papers were selected for in-depth analysis after screening. Using bibliometric methods, the analysis reveals the evolution of research trends, identifies key contributors and influential publications, and maps the knowledge structure of the field. Our study shows a significant increase in research output over the past five years, particularly in studies focusing on the integration of BIM with emerging technologies such as Digital Twins, the Internet of Things (IoT), and Machine Learning. The results indicate that the United States, China, and the United Kingdom lead in terms of research output and citation impact. Additionally, based on clustering results and representative keywords, several key research clusters were identified, including BIM in infrastructure lifecycle management, BIM collaboration in large-scale projects, and BIM for sustainable infrastructure design.

关键词： BIM civil infrastructure bibliometric analysis research trends construction technology

来源：评论

学校读者我要写书评

暂无评论

Enhanced Electrochemical Performance and Membrane Stability of a Hybrid Alkali-Acid Urea Electrolyzer

引用

ACS SUSTAINABLE CHEMISTRY & ENGINEERING 2025年第9期13卷 3423-3431页

作者： Zeng, Huiyan Hong, Enna Li, Peize Deng, Liting Liu, Hanwei Pan, Jiageng Gu, Long Chen, Jiajun Gao, Liang Yang, Chunzhen Sun Yat Sen Univ Sch Mat Shenzhen 518107 Peoples R China Guangdong Univ Technol Sch Chem Engn & Light Ind Guangzhou 510006 Peoples R China

Bipolar membrane (BPM)-based hybrid acid/alkali electrolyzers represent a notable advancement in the efficient production of hydrogen. However, the degradation behaviors of BPMs within hybrid systems are not well understood. This study introduces the urea oxidation reaction (UOR) as an alternative to the sluggish oxygen evolution reaction at the anode and utilizes X-ray computed tomography to assess the degradation of BPMs. Contrary to the conventional belief that the anion exchange layer is less stable in alkaline environments, it has been discovered that the BPM experiences significant corrosion on the cation exchange layer in hybrid electrolyzers. Using UOR as the anodic reaction not only significantly reduces the overall voltage by similar to 300 mV but also effectively mitigates membrane corrosion. These insights into the degradation of BPMs are crucial to the development of more efficient and durable hybrid electrolyzers for hydrogen production.

关键词： hydrogen evolution reaction urea oxidation reaction bipolar membrane water electrolyzer x-raytomography

来源：评论

学校读者我要写书评

暂无评论

Sharpness-Based Distance Detection

引用

APPLIED scienceS-BASEL 2024年第19期14卷 8913页

作者： Jin, Ying Zhou, Cangtao Dai, Wanjun Shenzhen Univ Technol Coll Engn Phys Shenzhen 518118 Peoples R China Shenzhen Univ Coll Appl Technol Shenzhen 518060 Peoples R China

With the advancement of artificial intelligence, visual ranging has become a widely researched field. This paper introduces a novel method for distance measurement by evaluating the sharpness of objects in the current frame. It is well known that the image is sharpest at the camera's focal point and becomes blurry when moving away from it. Leveraging this characteristic, this study utilizes sharpness to achieve distance measurement. Initially, the specific orientation of the target object is identified and located. The image area of the target object is cropped in a certain direction, and its image quality is assessed through sharpness calculation. Subsequently, the relationship between sharpness and distance values is analysed statistically, and a function curve depicting their correlation is plotted. Consequently, the distance between the target object and the detector can be determined based on sharpness with an extremely small margin of error using this method.

关键词： sharpness assessment distance measurement image quality visual ranging

来源：评论

学校读者我要写书评

暂无评论

Preparation and properties of pale-colored and optically transparent fluoro-containing polyimide films with low solar absorptivity and enhanced high-temperature dimensional stability for potential applications in space environments

引用

JOURNAL OF APPLIED POLYMER science 2024年第27期141卷 e55606-e55606页

作者： Wang, Zhenzhong He, Zhibin Ren, Xi Zhang, Yan Wang, Xiaolei Yang, Changxu Han, Shujun Yu, Haifeng Liu, Jin-gang China Univ Geosci Sch Mat Sci & Technol Engn Res CtrMinist Educ Geol Carbon Storage & Low Beijing 100083 Peoples R China Peking Univ Sch Mat Sci & Engn Key Lab Polymer Chem & Phys Minist Educ Beijing Peoples R China

Two organo-soluble polyimide (PI) resins were prepared from a tricyclic fluoro-containing dianhydride 9,9-bis(trifluoromethyl)xanthene-2,3,6,7-tetracarboxylic dianhydride (6FCDA) and aromatic diamine of 2,2-bis[4-(4-aminophenoxy)phenyl]hexafluoropropane (BDAF) for PI-IIa and 1,3-bis(3-aminophenoxy)benzene (133APB) for PI-IIb, respectively. For comparison, two analogous PIs were prepared from 4,4 '-(hexafluoroisopropylidene)diphthalic anhydride (6FDA) and the same diamines to afford PI-Ia (6FDA-BDAF) and PI-Ib (6FDA-133APB), respectively. Incorporation of the rigid and planar xanthene units in the 6FCDA-PIs obviously decreased the solubility of the resins in organic solvents. Flexible and tough PI films were fabricated from the PI solutions in N,N-dimethylacetamide (DMAc). The PI films derived from the rigid and planar 6FCDA dianhydride exhibited obviously enhance thermal stability, and high-temperature dimensional stability. For example, PI-IIa (6FCDA-BDAF) showed the glass transition temperature (Tg) and coefficient of linear thermal expansion (CTE) values of 311.5 degrees C and 50.5 x 10-6/K, respectively, which were all superior to those of the PI-Ia counterpart (Tg = 264.6 degrees C;CTE = 55.4 x 10-6/K). In addition, the 6FCDA-PI films maintained the intrinsically excellent optical transparency of the fluoro-containing PI films and showed the comparable optical properties to those of the 6FDA-PI films. As for the properties highly related to the space applications, all the PI films exhibited low solar absorptivity (alpha) values of 0.18-0.20 and the good thermal emissivity (epsilon) values in the range of 0.68-0.70. PI-Ia (6FDA-BDAF) and PI-IIa (6FCDA-BDAF) films showed the similar atomic oxygen erosion behaviors with the standard Kapton (R) type of PI film derived from pyromellitic dianhydride (PMDA) and 4,4 '-oxydianiline (ODA). Fluoro-containing polyimide film with improved thermal stability and low solar absorptivity image

关键词： glass transition membranes polycondensation polyimides thermal properties

来源：评论

学校读者我要写书评

暂无评论

Synthesis and properties of novel colorless polyimide containing indene and amide groups

引用

JOURNAL OF POLYMER science 2024年第18期62卷 4136-4147页

作者： Lu, Zhaohui Li, Dongpeng Gu, Qian Qian, Guangtao Li, Dandan Chen, Chunhai China Nucl Power Technol Res Inst Co Ltd Room 420Shenzhen Technol BldgShangbu Middle Rd W Shenzhen 518000 Peoples R China Donghua Univ Coll Mat Sci & Engn Ctr Adv Low Dimens Mat State Key Lab Modificat Chem Fibers & Polymer Mat Shanghai Peoples R China Donghua Univ Collaborat Innovat Ctr Civil Aviat Composites Shanghai Peoples R China

Two novel diamines 1-(4-aminophenyl)-1,3,3-trimethyl-2,3-dihydro-1H-indene-5-amine and 4-amino-N-(4-(5-(4-aminobenzamide)-1,3,3-trimethyl-2,3-dihydro-1H-inden-1-yl) phenyl) benzamide containing indene and amide groups were successfully designed and synthesized, and a series of colorless polyimides (CPIs) derived from the two diamines with 1,2,4,5-cyclohexanetetracarboxylic dianhydride in various ratios were copolymerized. The introduction of aliphatic ring structures was conducive to the improvement of optical properties, while the incorporation of amide groups improved thermal and mechanical properties. These CPI films exhibited excellent optical properties (T-400 > 80%), high heat resistance (T-g > 300 degrees C) and mechanical properties with the synergistic action of the two groups. Furthermore, the effect of the content of amide groups on the intermolecular interaction of CPIs was systematically analyzed. This study provides a fancy method for the development of heat-resistant colorless materials for optical applications.

关键词： amide group colorless polyimide high heat resistant indene structure

来源：评论

学校读者我要写书评

暂无评论

Synthesis and properties of modified thermoplastic polyimide films with good dielectric properties at high frequency and enhanced thermal stability via incorporation of rigid ester and biphenyl structural units

引用

POLYMERS FOR ADVANCED TECHNOLOGIES 2024年第2期35卷 e6323-e6323页

作者： Han, Shujun Qi, Yuexin Zhi, Xinxin Ren, Xi Wang, Zhenzhong He, Zhibin Yang, Changxu Yu, Haifeng Liu, Jingang China Univ Geosci Minist Educ Geol Carbon Storage & Low Carbon Utili Sch Mat Sci & Technol Engn Res Ctr Beijing Peoples R China Peking Univ Sch Mat Sci & Engn Key Lab Polymer Chem & Phys Minist Educ Beijing Peoples R China China Univ Geosci Minist Educ Geol Carbon Storage & Low Carbon Utili Sch Mat Sci & Technol Engn Res Ctr Beijing 100083 Peoples R China

A series of ester- and fluoro-containing thermoplastic polyimide (PI) films, PEsI-1 similar to PEsI-4 have been prepared by the two-step thermal imidization procedure via the soluble poly(amic acid) (PEsAA) precursors from the copolymerization of four monomers, including the dianhydrides of bisphenol A dibenzoate-3,3 ',4,4 '-tetracarboxylic acid dianhydride (TMBPA) and 3,3 ', 4,4 '-biphenyl tetracarboxylic acid dianhydride (BPDA) and the diamine monomers of 4-aminophenyl-4 '- aminobenzoate (APAB) and 2,2 '-bis(trifluoromethyl)-4,4 '-diamino biphenyl (TFMB) in the polar aprotic solvent of N-methyl-2-pyrrolidinone (NMP). The PI films obtained from the high-temperature dehydration of the PEsAA solutions exhibited the good thermal stabilities with the glass transition temperatures (T-g) over 269 degrees C, the 5% weight loss temperatures (T-5%) higher than 480 degrees C, and the linear coefficients of thermal expansion (CTE) values in the range of 17.7 x 10(-6)/K-33.6 x 10(-6)/K in the temperature range of 50-250 degrees C. Meanwhile, the PI films showed good thermoplasticity in the dynamic mechanical analysis (DMA) tests, in which the storage modulus of the PI films dropped sharply in the temperature range of glass transition of the polymers. At last, the PI films exhibited the good dielectric properties with the breakdown voltages (V-b) over 5200 V, the dielectric strength (D-s) higher than 210 V/mu m, the dielectric constants (D-k) in the range of 3.26 similar to 3.32 at the frequency of 10 GHz, and the dielectric dissipation factors (D-f) of 0.0038 similar to 0.0047. Compared with the commonly used PEsI-ref film for high-frequency flexible copper clad laminates (FCCL), the currently developed PI films exhibited the obviously increased T-g values, decreased CTE values, and comparable dielectric properties.

关键词： dielectric properties ester-containing dianhydride FCCL high frequency polyimide thermal properties

来源：评论

学校读者我要写书评

暂无评论

A double neural network model predictive control method for series elastic actuator's motor thermal protection

引用

MEASUREMENT science AND technology 2025年第1期36卷 016232-016232页

作者： Zhang, Anlong Lin, Zhiyun Wang, Bo Han, Zhimin Hangzhou Dianzi Univ Artificial Intelligence Inst Sch Automat Hangzhou 310018 Zhejiang Peoples R China Southern Univ Sci & Technol Sch Automat & Intelligent Mfg Shenzhen Key Lab Control Theory & Intelligent Syst Shenzhen 518055 Guangdong Peoples R China Peng Cheng Lab Shenzhen 518000 Guangdong Peoples R China

Traditional motor protection methods are conservative, neglecting actual thermal conditions and underutilizing the motor's performance. This paper proposes a novel double neural network model predictive control (DNMPC)-based protection method to maximize motor performance. First, we analyze the system's thermal properties and propose a thermal lemma to demonstrate that solving the protection problem involves determining the maximum allowable control input boundary. Second, instead of directly measuring the motor temperature, the neural network (NN) method is proposed to establish the system's thermal model for estimating the motor temperatures. Third, leveraging the NN model, we propose a model predictive control strategy designed to determine the maximum allowable control input boundaries, which we refer to as the neural network model predictive control (NMPC) method. Consequently, this approach has led to the development of an advanced motor protection system. To further reduce the computational burden, we incorporate an additional NN to directly approximate the NMPC controller, thereby forming our proposed DNMPC approach. Finally, comparative experimental validation demonstrates the effectiveness and superiority of the proposed method. The results indicate that the NN model is highly accurate, eliminating the need for direct temperature measurements and enabling the prediction of future motor temperatures. Additionally, the DNMPC-based protection method significantly improves the joint's peak torque output by 64.3 % compared to conservative continuous current limited protection methods. The computational efficiency is also notable, with the NMPC achieving a runtime of approximately 20 ms, while the DNMPC achieves only 0.2 ms.

关键词： motor thermal protection neural network temperature predicting model predictive control

来源：评论

学校读者我要写书评

暂无评论

Current Status and Future Prospects of Digital Twin technology Applications in Intelligent Transportation Infrastructure Management

引用

IET INTELLIGENT TRANSPORT SYSTEMS 2025年第1期19卷

作者： Gao, Chao Jia, Lei Sun, Maopeng Luo, Junshao Changan Univ Sch Humanities Xian Shaanxi Peoples R China Minist Educ PRC Engn Res Ctr Highway Infrastruct Digitalizat Xian 710064 Shaanxi Peoples R China Shenzhen Urban Transport Planning Ctr Co Ltd Shenzhen Guangdong Peoples R China Univ Elect Sci & Technol Shenzhen Inst Adv Studies Shenzhen Guangdong Peoples R China Tech Univ Munich Sch Engn & Design Munich Germany

Digital twin technology has emerged as a promising solution for the digital transformation of transportation infrastructure. This paper presents a comprehensive review of digital twin technology in the transportation industry, analyzing its relationship with key enabling technologies. By examining the development of digital twins across various transportation domains, we summarize the connotation, characteristics, and development trends of digital twins in transportation infrastructure. We propose a conceptual model and a digital system architecture for transportation infrastructure, along with a set of engineering application technical guidelines. Our findings reveal that current digital twin technology still faces challenges in driving the digital transformation of the transportation industry. From a theoretical perspective, the granularity of digital twin models is insufficient, lacking systematic support. In terms of application, the reconstruction of full-cycle digital processes primarily focuses on low-level applications. Future research should focus on theory innovation, data fusion, model integration, and professional applications to promote the development of digital twin technology in transportation infrastructure. Additionally, emphasis should be placed on collaborative design across disciplines and data standardization to build intelligent full-lifecycle management platforms, improve operation and maintenance efficiency, and provide new ideas and methods for sustainable development.

关键词： data analysis maintenance engineering smart cities sustainable development traffic information systems

来源：评论

学校读者我要写书评

暂无评论

A research on improving the precision of laser tracker in alignment based on Pareto improvement principle

引用

REVIEW OF SCIENTIFIC INSTRUMENTS 2024年第10期95卷 105112页

作者： Zhong, Wen Cheng, Wenjie Gao, Tianyu Zhang, Xin Mao, Jianjun Qi, Zhijun Liu, Zengquan Yu, Hang Liu, Ming Wang, Wei Inst Adv Sci Facil Shenzhen 518000 Guangdong Peoples R China

The accuracy of laser trackers in large-scale dimensional metrology is subject to various influencing factors, with instrument positioning being a primary source of error. To address this, a multi-objective optimization algorithm, grounded in the Pareto improvement principle, is proposed. This algorithm is designed to optimize instrument placement, thereby minimizing measurement errors and enhancing the algorithm's efficacy in error reduction. Thereby, this article proved that positioning the laser tracker consistently on one side of the measurement area and aligning its height with the measuring points can effectively reduce the uncertainty of control point errors by up to 50%. (c) 2024 Author(s).

关键词： Instrument errors

来源：评论

学校读者我要写书评

暂无评论

Analysis of preoperative ocular optical parameters in patients with cataract

引用

BIOMEDICAL ENGINEERING ONLINE 2025年第1期24卷 1-13页

作者： Xi, Wenqun Liu, Xinhua Ren, Zhiqiang Huang, Xiaosheng Sun, Liangnan Ye, Ye Zhao, Yanhua Zhang, Zhe Zeng, Kun Southern Med Univ Shenzhen Eye Hosp Shenzhen Eye Med Ctr 18 Zetian Rd Shenzhen 518040 Guangdong Peoples R China Dept Southern Univ Sci & Technol 1088 Xueyuan Ave Shenzhen 518055 Guangdong Peoples R China

This study aims to evaluate the distribution of preoperative corneal parameters obtained using the Pentacam anterior segment analyzer in Chinese male and female patients with cataracts and to investigate the correlation between these parameters and related factors. Preoperative examination data of the eyes of 1,255 patients who underwent cataract surgery were retrospectively analyzed. The Pentacam AXL was used to extract preoperative corneal measurements, and the total corneal measurement data were analyzed. The average age of the patients was 52.9 +/- 21.3 years. The mean simulated keratometry values and corneal curvature of total corneal refractive power were positively correlated with age (both P < 0.01). Spearman's correlation analysis revealed a positive association between age and anterior corneal spherical aberration, posterior corneal spherical aberration, and total corneal spherical aberration changes. A negative correlation was found between age and with-the-rule astigmatism, and it was positively correlated with the ratios of against-the-rule and oblique astigmatism. A significant between-eye correlation was observed regarding spherical aberration (Z40), horizontal coma (Z31), vertical coma (Z3-1), and horizontal trefoil (Z33). The corneal curvature in females was significantly steeper than that in males (P < 0.01). Corneal curvature, corneal spherical aberration, and corneal astigmatism were found to change with age. Additionally, we found physiological differences between the sexes. Individual measurements could be taken preoperatively to facilitate the development of personalized surgical plans. By identifying age- and gender-related corneal variations, this study enables more personalized cataract surgery planning, potentially improving refractive outcomes and reducing postoperative complications through tailored surgical techniques and intraocular lens selection.

关键词： Cataract Simulated keratometry Total corneal refractive power High-order aberration Pentacam anterior segment analysis system

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：