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2019 5th International Conference on Applied materials and Manufacturing technology, ICAMMT 2019

作者： Zhang, Guohui Guo, Shaoqing Huang, Shuai Zhou, Biao Yan, Taiqi Chen, Bingqing Zhang, Xuejun 3D Printing Research Engineering Technology Center Beijing Institute of Aeronautical Materials Beijing100095 China

Using selective laser melting technique, 3 sets of GH4169 samples were formed by various laser power and scanning speed to prepare mechanical properties test specimens. The defects and porosity of the samples were measured by CT inspection. The tensile test was carried out at room temperature. The fracture morphology of the tensile samples was observed by SEM and the fracture mechanism was analyzed. The results show that some samples have pores with largest size of 100μm, which have no effect on the subsequent tensile properties test. The tensile strength does not change significantly with the varying process parameters, and the highest strength could reach 1480MPa. The elongation and the reduction of area decrease gradually as the scanning speed increases, indicating that the plasticity of the material is descending. The fracture mechanism of the three sets specimens are ductile fractures, and the microscopic morphology shows distribution of equiaxed dimples. © Published under licence by IOP Publishing Ltd.

关键词： Selective laser melting

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3d-printed Al2O3 framework supported carbon-bridged tri-s-triazine of g-C3N4 for photocatalytic tetracycline oxidation

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Chemical Engineering Journal 2024年 487卷

作者： Hu, Chechia Chang, Lee-Lee Chen, Wei Hsu, Wan-Yuan Chien, Szu-Chia Chen, Chien-Hua Lin, Yu-Ting Hsu, Tzu-Jung Tung, Kuo-Lun Center National Taiwan University of Science and Technology Daan Dist. Taipei City106 Taiwan R&D Center for Membrane Technology Chung Yuan Christian University Chungli Dist. Taoyuan City32023 Taiwan Department of Chemical Engineering National Taiwan University Taipei city10617 Taiwan Department of Chemical Engineering Chung Yuan Christian University Chungli Dist. Taoyuan City320 Taiwan Department of Chemical and Materials Engineering National Central University Zhongli Dist. Taoyuan City320 Taiwan Department of Chemical and Materials Engineering National Ilan University Yilan County26047 Taiwan Taiwan High Speed 3D Printing Research Center National Taiwan University of Science and Technology Daan Dist. Taipei City106 Taiwan

Powder-like g-C3N4 has been widely used as a photocatalyst but exhibits several drawbacks, including unrecyclable, high charge recombination, and limited light absorption. In this study, carbon-bridged g-C3N4 was successfully prepared and coated on a 3d-printed Al2O3 substrate for the photocatalytic oxidation of tetracycline. Oxamide (Od), malonamide (Md), and succinamide (Sd) were used as carbon-containing linkers to react with precursors (melamine and urea) and produce carbon-bridged g-C3N4. Carbon substitution at the bridged N atoms of g-C3N4 improved light absorption, reduced charge recombination, and resulted in high photocatalytic tetracycline removal efficiency. Computational calculations were also employed, and Bader charge analysis supported the charge redistribution and charge transfer of the carbon-bridged g-C3N4 samples. Our results indicated that the degradation of tetracycline followed step-by-step oxidation, deamination, and mineralization to form CO2 and H2O. The 3d-printed Al2O3-supported carbon-bridged g-C3N4 exhibited a high removal rate of 85–90 % and stability for photocatalytic reactions and can be reused for at least 10 cycles. This study demonstrates that the 3d-printed Al2O3-supported carbon-bridged g-C3N4 catalyst is an efficient and effective catalyst support system for photocatalytic reactions. © 2024 Elsevier B.V.

关键词： Carbon

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Multi-scale fabrication and challenges in 3d printing of special -shaped concrete structures

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Journal of Building Engineering 2025年 111卷

作者： Lin, Wenyu Wang, Li Li, Zhijian Bai, Gang Wang, Qiang Qu, Yao School of Civil and Transportation Engineering Hebei University of Technology Tianjin 300401 China Engineering Research Center on Construction 3D Printing of Hebei Tianjin 300401 China China Urban Construction Design & Research Institute Co. Ltd Beijing 100120 China

3d-printed concrete (3dPC) has demonstrated substantial potential for fabricating geometrically complex structures through its inherent capabilities of parametric design flexibility and formwork-free construction. This review systematically examines the critical triad of structural design, material property control, and deposition technologies essential for 3dPC of non-standard geometries. In structural design, the synergistic integration of biomimetic principles with topology optimization enables lightweight configurations while maintaining material efficiency. For material properties, precisely controlled chemical coagulation and physical flocculation processes effectively mitigate strength deficiency and deformation challenges during rapid concrete deposition. Regarding deposition technologies, the implementation of modular printing strategies, auxiliary support systems, and injection 3d-printed concrete methods demonstrates measurable improvements in both structural integrity and manufacturing efficiency. Although challenges persist in large-scale applications, continuous advancements in automated process control and material innovation suggest transformative potential for architectural engineering applications. © 2025

关键词： 3d-printed concrete material regulation Multi-scale fabrication Process optimization Special-shaped structure

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Architecture and Key Technologies of Parallel dispatching System for Railway Technical Operation Stations

Architecture and Key Technologies of Parallel Dispatching Sy...

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Complex Systems and Intelligent Science (CSIS-IAC), International Annual Conference on

作者： Gang Xiong donghu Yang Wei Xu Runmei Li Shichao Chen Bing Song Xisong dong Fenghua Zhu State Key Laboratory of Multimodal Artificial Intelligence Systems Institute of Automation Chinese Academy of Sciences Beijing China Beijing Engineering Research Center of Intelligent Systems and Technology Institute of Automation Chinese Academy of Sciences Beijing China School of Artificial Intelligence University of Chinese Academy of Sciences Beijing China Signal and Communication Research Institute China Academy of Railway Science Corporation Limited Beijing China The School of Electronic and Information Engineering Beijing Jiaotong University Beijing China Beijing Huairou Academy of Parallel Sensing Beijing China Guangdong Engineering Research Center of 3D Printing and Intelligent Manufacturing Cloud Computing Center Chinese Academy of Sciences Dongguan China

A railroad technical operation station is an extensive and complex operation system and a variety of random disturbing factors further increase the complexity of its command and dispatching. To enhance the railroad technical operation stations' intelligence, and integration level, and enhance its dispatching management ability of complex operation plans, based on the ACP approach, this paper designs the parallel dispatching system (PdS) architecture, and describes its key technologies including the artificial dispatching system (AdS), computing experiments, parallel execution, etc. On the basis of the artificial dispatching system, computational experiments can optimize various types of technical operations and the overall operational process, to achieve parallel execution between the actual dispatching system and AdS. PdS can provide more efficient and intelligent command and dispatching solutions for railroad technical work stations, and promote the development of the railroad transportation industry in the direction of higher quality and efficiency.

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Adaptive mechanical properties and stretchability of novel chainmail fabrics based on overlapping tessellation strategies

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Additive Manufacturing 2023年 76卷

作者： Bhat, Chinmai Kumar, Ajeet Lin, Shang-Chih Jeng, Jeng-Ywan Department of Mechanical Engineering National Taiwan University of Science and Technology No. 43 Section 4 Keelung Rd Taipei106 Taiwan Taiwan High Speed 3D Printing Research Center National Taiwan University of Science and Technology No. 43 Section 4 Keelung Rd Taipei106 Taiwan Department of Design Indian Institute of Technology Assam Guwahati781039 India Graduate Institute of Biomedical Engineering National Taiwan University of Science and Technology No. 43 Section 4 Keelung Rd Taipei106 Taiwan Academy of Innovative Semiconductor and Sustainable Manufacturing National Cheng Kung University No. 1 Dasyue Rd East District Tainan701 Taiwan

This study introduces a novel design and additive manufacturing of technical textiles to achieve tunable mechanical properties through the tessellations of a singular material. The design of these chainmail fabrics was inspired by overlapping tessellation strategies found in biological structures. Two types of chainmail fabrics —BCC and FCC were designed to exhibit high flexibility and stretchability with two-dimensional degrees of freedom. The fabrics were designed to bend along two orthogonal axes and drape around curved surfaces. Furthermore, the relative placement of the unit cells was adjusted to selectively arrest the degrees of freedom, resulting in chainmail fabrics with tunable flexibilities and mechanical properties. Four fabrics for each design Fabric-A, Fabric-B, Fabric-C, and Fabric-d were developed with varying degrees of freedom. All the designed chainmail fabrics were additively manufactured using HP-MJF powder bed fusion technology with a polyamide-12 material. The mechanical properties of the fabricated samples were evaluated through experimental tension tests and numerical simulations. The fabricated BCC and FCC chainmail fabrics exhibited a stress-free zone, followed by an elastoplastic zone, with different mechanical properties observed at different orientations. The FCC fabrics outperformed the BCC fabrics with 45° orientation, exhibiting excellent load-bearing properties, and the 0° orientation showed superior energy absorption capacity. The numerical simulations accurately predicted the mechanical properties and failure locations. Fabric-A was highly flexible but had compromised load-bearing and energy-absorption abilities, whereas Fabric-d acted as a rigid lattice structure with exceptional load-bearing and energy-absorbing properties. FCC fabrics are easier to manufacture using various polymer additive processes owing to their supportless nature. Tunable technical fabrics such as these have potential applications in lightweight and adaptive

关键词： 3d printing

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Terms development of Additive Manufacturing

Terms Development of Additive Manufacturing

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digital Twins and Parallel Intelligence (dTPI), IEEE International Conference on

作者： Tariku Sinshaw Tamir Gang Xiong Jingchao Jiang Zhen Shen Ehtisham Lodhi Hub Ali Li Wan Beijing Engineering Research Center of Intelligent Systems and Technology Institute of Automation Chinese Academy of Sciences Beijing China School of Artificial Intelligence University of Chinese Academy of Sciences Beijing China Guangdong Engineering Research Center of 3D Printing and Intelligent Manufacturing Cloud Computing Center Chinese Academy of Sciences Dongguan China Department of Mechanical and Automation Engineering The Chinese University of Hong Kong Shatin Hong Kong Intelligent Manufacturing Center Qingdao Academy of Intelligent Industries Qingdao China Ten Dimensions (Guangdong) Technology Co. Ltd Foshan China

ISBN: (数字)9781665492270

ISBN: (纸本)9781665492287

Nowadays, additive manufacturing has been increasingly developed and applied in many fields. As a rapid development of additive manufacturing, similar terms are appeared, such as 3d printing, freeform fabrication, rapid tooling, rapid manufacturing, direct digital manufacturing, layer manufacturing, additive process, 4d printing, 3d bioprinting, and 3d biofabrication. This paper reports and analyze the development of these terms. Moreover, it tries to give the readers a comprehensive understanding of these terms and their development.

关键词： Fabrication Additives Three-dimensional displays Three-dimensional printing Market research digital twins Biological materials

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Restoration of electrical microenvironment enhances bone regeneration under diabetic conditions by modulating macrophage polarization

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Bioactive materials 2021年第7期6卷 2029-2038页

作者： Xiaohan dai Boon Chin Heng Yunyang Bai Fuping You Xiaowen Sun Yiping Li Zhangui Tang Mingming Xu Xuehui Zhang Xuliang deng Hunan Key Laboratory of Oral Health Research&Hunan 3D Printing Engineering Research Center of Oral Care&Hunan Clinical Research Center of Oral Major Diseases and Oral Health&Xiangya Stomatological Hospital&Xiangya School of Stomatology Central South UniversityChangsha410008PR China Department of Dental Materials&Dental Medical Devices Testing Center Peking University School and Hospital of StomatologyBeijing100081PR China Department of Geriatric Dentistry Peking University School and Hospital of StomatologyBeijing100081PR China Central Laboratory Peking University School and Hospital of StomatologyBeijing100081PR China Institute of Systems Biomedicine Department of ImmunologySchool of Basic Medical SciencesBeijing Key Laboratory of Tumor Systems BiologyPeking University Health Science CenterBeijing100191PR China National Engineering Laboratory for Digital and Material Technology of Stomatology NMPA Key Laboratory for Dental MaterialsBeijing Laboratory of Biomedical Materials&Beijing Key Laboratory of Digital StomatologyPeking University School and Hospital of StomatologyBeijing100081PR China

Macrophage-mediated inflammation compromises bone repair in diabetic *** signaling cues are known to regulate macrophage ***,the biological effects of electrical microenvironment from charged biomaterials on the immune response for regulating osteogenesis under diabetic conditions remain to be *** the endogeneous electrical microenvironment of native bone tissue was recapitulated by fabricating a ferroelectric BaTiO_(3)/poly(vinylidene fluoridetrifluoroethylene)(BTO/P(VdF-TrFE))nanocomposite *** vitro,the polarized BaTiO_(3)/poly(vinylidene fluoridetrifluoroethylene)(BTO/P(VdF-TrFE))nanocomposite membranes inhibited high glucose-induced M1-type inflammation,by effecting changes in cell morphology,M1 marker expression and pro-inflammatory cytokine secretion in *** led to enhanced osteogenic differentiation of human bone marrow mesenchymal stem cells(BM-MSCs).In vivo,the biomimetic electrical microenvironment recapitulated by the polarized nanocomposite membranes switched macrophage phenotype from the pro-inflammatory(M1)into the pro-healing(M2)phenotype,which in turn enhanced bone regeneration in rats with type 2 diabetes *** studies revealed that the biomimetic electrical microenvironment attenuated pro-inflammatory M1 macrophage polarization under hyperglycemic conditions by suppressing expression of AKT2 and IRF5 within the PI3K-AKT signaling pathway,thereby inducing favorable osteo-immunomodulatory *** study thus provides fundamental insights into the biological effects of restoring the electrical microenvironment conducive for osteogenesis under dM conditions,and offers an effective strategy to design functionalized biomaterials for bone regeneration therapy in diabetic patients.

关键词： Electrical microenvironment diabetes Ferroelectric nanocomposites Bone regeneration Macrophage polarization

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development of a simulation system for femoroacetabular impingement detection based on 3d images

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Journal of hip preservation surgery 2024年第1期11卷 20-29页

作者： Chun-Ming Chen Shang-Chih Lin Chen-Te Wu Yi-Sheng Chan Taiwan High Speed 3D Printing Research Center National Taiwan University of Science and Technology No. 43 Sec. 4 Keelung Rd. Da'an Dist. Taipei Taiwan. Graduate Institute of Biomedical Engineering National Taiwan University of Science and Technology No. 43 Sec. 4 Keelung Rd. Da'an Dist. Taipei Taiwan. Department of Medical Imaging and Intervention Chang Gung Memorial Hospital No. 5 Fuxing St. Guishan Dist. Taoyuan Taiwan. Department of Orthopedic Surgery Chang Gung Memorial Hospital No. 222 Maijin Rd. Anle Dist. Keelung Taiwan. Comprehensive Sports Medicine Center Chang Gung Memorial Hospital No. 5 Fuxing St. Guishan Dist. Taoyaun Taiwan. Bone and Joint Research Center Chang Gung Memorial Hospital No. 5 Fuxing St. Guishan Dist. Taoyuan Taiwan.

Image-based criteria have been adopted to diagnose femoroacetabular impingement (FAI). However, the overlapping property of the two-dimensional X-ray outlines and static and supine posture of taking computed tomography (CT) and magnetic resonance imaging images potentially affect the accuracy of the criteria. This study developed a CT image-based dynamic criterion to effectively simulate FAI, thereby providing a basis for physicians to perform pre-operative planning for arthroscopic surgery. Post-operative CT images of 20 patients with satisfactory surgical results were collected, and 10 sets of models were used to define the flexion rotation centre (FRC) of the three-dimensional FAI model. First, let these 10 groups of models simulate the FAI detection action and find the best centre offset, and then FRC is the result of averaging these 10 groups of best displacements. The model was validated in 10 additional patients. Finally, through the adjustment basis of FRC, the remaining 10 sets of models can find out the potential position of FAI during the dynamic simulation process. Rotational collisions detected using FRC indicate that the patient's post-operative flexion angle may reach 120° or greater, which is close to the actual result. The recommended surgical range of the diagnostic system (average length of 6.4 mm, width of 4.1 mm and depth of 3.2 mm) is smaller than the actual surgical results, which prevents the doctor from performing excessive resection operations, which may preserve more bones. The FRC diagnostic system detects the distribution of FAI in a simple manner. It can be used as a pre-operative diagnosis reference for clinicians, hoping to improve the effect and accuracy of debridement surgery.

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Terms development of Additive Manufacturing

TechRxiv

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TechRxiv 2022年

作者： Tamir, Tariku Sinshaw Jiang, Jingchao Xiong, Gang Shen, Zhen Lodhi, Ehtisham Ali, Hub Wan, Li Beijing Engineering Research Center of Intelligent Systems and Technology Institute of Automation Chinese Academy of Sciences Beijing100190 China School of Artificial Intelligence University of Chinese Academy of Sciences Beijing100049 China Department of Mechanical and Automation Engineering The Chinese University of Hong Kong Shatin Hong Kong Guangdong Engineering Research Center of 3D Printing and Intelligent Manufacturing Cloud Computing Center Chinese Academy of Sciences Dongguan523808 China Intelligent Manufacturing Center Qingdao Academy of Intelligent Industries Qingdao266000 China Technology Co. Ltd Foshan528225 China Institute of automation China

关键词： 3d printers

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Achilles tendinopathy treatment via circadian rhythm regulation

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Journal of Advanced research 2024年

作者： Zhang, Yibo Wu, Yizhang Wang, Yong Lu, Jun Lu, Yang Wang, Peng Li, Lan Yan, Wenjin Cai, Hongling Hannah Leigh, Weisbecker Zhang, Lin Bai, Wubin Jiang, Qing Xu, Xingquan State Key Laboratory of Pharmaceutical Biotechnology Division of Sports Medicine and Adult Reconstructive Surgery Department of Orthopedic Surgery Nanjing Drum Tower Hospital Affiliated Hospital of Medical School Nanjing University Nanjing 210008 China Department of Applied Physical Sciences University of North Carolina at Chapel Hill Chapel Hill 27599 NC United States Wide Bandgap Semiconductor Technology Disciplines State Key Laboratory School of Microelectronics Academy of Advanced Interdisciplinary Research Xidian University Xi'an 710071 China Jiangsu Key Laboratory for Biomaterials and Devices State Key of Laboratory Bioeletronics School of Biological Sciences & Medical Engineering Southeast University Nanjing 210096 China Jiangsu Engineering Research Center for 3D Bioprinting Nanjing 210000 China National Laboratory of Solid State Microstructures Collaborative Innovation Center of Advanced Microstructures School of Physics Nanjing University Nanjing 210093 China Institute of Medical 3D Printing Nanjing University Nanjing 210000 China

Introduction: Achilles tendinopathy (AT) is a prevalent musculoskeletal disorder closely linked to oxidative stress. Existing evidence suggests a potential link between circadian clock rhythms and oxidative stress. However, the precise role of the circadian clock in the progression and treatment of AT remains unclear. Objective: The purpose of this study was to investigate the role of the Achilles tendon circadian clock in AT pathology and explore the potential use of biomaterials for modulating the circadian clock in the treatment of AT. Methods: We utilized in vivo and in vitro models to investigate the alterations of the circadian clock within the Achilles tendon during the progression of AT, as well as its impact on disease development. Additionally, we fabricated Nb₂C@CeO₂ composites featuring a Schottky heterojunction for regulating the circadian rhythm and validated its therapeutic efficacy and molecular mechanism of AT through both in vivo and in vitro experiments. Results: The Achilles tendon functioned as a peripheral oscillator with an independent and self-sustained time-keeping system. The rhythm of the Achilles tendon clock was disrupted during the development of AT, as indicated by the decreased amplitude of Bmal1 and Nrf2 rhythm expression. Mechanistically, the knockdown of Bmal1 disrupted the Achilles tendon clock, thereby destroying the Bmal1-Nrf2 axis dependent molecular defense mechanism, and exacerbating the inflammatory response, whereas overexpression of Bmal1 had a protective effect. Nb₂C@CeO₂ composites with Schottky heterojunctions enhance intercellular electrical signaling, boosting Bmal1 expression and mitigating AT's pathological changes. Importantly, enhancing Bmal1 expression during its peak, rather than its trough, was more effective. Conclusion: This study identified the protective role of the circadian clock against oxidative stress and inflammation in the Achilles tendon. Achilles tendon c

关键词： Achilles tendinopathy Bmal1-Nrf2 axis Circadian clock Schottky heterojunction Time of administration

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