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2021 IEEE International Symposium on Antennas and Propagation and North American Radio Science Meeting, APS/URSI 2021

作者： Huang, Kai-Qi Swaminathan, Madhavan 3D Systems Packaging Research Center School of Electrical and Computer Engineering School of Materials Science and Engineering Georgia Institute of Technology AtlantaGA United States

ISBN: (纸本)9781728146706

This paper presents a compact planar design of 2-d Butler matrix steering the beam of a 2× 2 patch antenna array for d-band frequencies. The stripline Butler matrix feeding network is beneath the microstrip patch array with a similar size. The full-wave simulation results show an operating band wider than 125GHz - 150GHz for the butler matrix, and demonstrate the four beams of antenna array with 8.5dBi gain. © 2021 IEEE.

关键词： Microstrip antennas

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Fabrication of antireflective hydrophobic periodic micro-hole structures on ZnS surface by femtosecond laser direct writing 7

Fabrication of antireflective hydrophobic periodic micro-hol...

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2021 7th International Conference on Manufacturing technology and Applied Materials, ICAMMT 2021

作者： Zhou, Kun Yuan, Yanping Chen, Jimin Wang, Chunlian Xiang, Shibo Institute of Laser Engineering Faculty of Materials and Manufacturing Beijing University of Technology Beijing100124 China Ministry of Education Beijing100124 China Beijing Engineering Research Center of Laser Technology Beijing University of Technology Beijing100124 China Beijing Engineering Research Center of 3D Printing for Digital Medical Health Beijing University of Technology Beijing100124 China

ZnS has a promising wide range of applications in optical and optoelectronic areas. But the Fresnel reflection on ZnS surface reduces the transmittance of light and causes an obstacle in its applications. Thus, it is crucial to minimize the Fresnel reflection to promote the antireflection property. This paper demonstrates an effective way to fabricate antireflective periodic micro-hole structures on ZnS surface by femtosecond laser direct writing. The effects of laser power, scanning speed on the morphology of the holes are investigated. The fabricated structures exhibit an excellent antireflection property, and achieve more than 30% decrease in reflectance in the near-ultraviolet spectral wavelength range and near-infrared spectral region (200-800 nm), reducing 35% in 280 nm, especially. Besides, the prepared surface demonstrates effective performance concerning hydrophobicity with a contact angle of 107.4°, and the contact angle of unprocessed ZnS is 96.2°. These results show that the femtosecond laser can induce the antireflection and hydrophobic properties on the surface of ZnS, which has a potential application in outdoor optical and optoelectronic devices. © Published under licence by IOP Publishing Ltd.

关键词： Zinc sulfide

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ductilization of 2.6-GPa alloys via short-range ordered interfaces and supranano precipitates

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Science (New York, N.Y.) 2025年第6732期387卷 401-406页

作者： Yan, Yong-Qiang Cha, Wen-Hao Liu, Sida Ma, Yan Luan, Jun-Hua Rao, Ziyuan Liu, Chang Shan, Zhi-Wei Lu, Jian Wu, Ge Center for Advancing Materials Performance from the Nanoscale (CAMP-Nano) Hysitron Applied Research Center in China (HARCC) and Center for Alloy Innovation and Design (CAID) State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xi'an China Laboratory for Multiscale Mechanics and Medical Science SV LAB School of Aerospace Xi'an Jiaotong University Xi'an China Faculty of Georesources and Materials Engineering RWTH Aachen University Aachen Germany Department of Materials Science and Engineering Delft University of Technology Delft Netherlands Inter-University 3D Atom Probe Tomography Unit Department of Mechanical Engineering City University of Hong Kong Hong Kong China Max Planck Institute for Sustainable Materials Düsseldorf Germany National Engineering Research Center of Light Alloy Net Forming Shanghai Jiao Tong University Shanghai China Centre for Advanced Structural Materials Department of Materials Science and Engineering City University of Hong Kong Hong Kong China

Higher strength and higher ductility are desirable for structural materials. However, ultrastrong alloys inevitably show decreased strain-hardening capacity, limiting their uniform elongation. We present a supranano (<10 nanometers) and short-range ordering design for grain interiors and grain boundary regions, respectively, in fine-grained alloys based on vanadium, cobalt, and nickel, with additions of tungsten, copper, aluminum, and boron. The pronounced grain boundary-related strengthening and ductilization mechanism is realized through segregation of the short-range ordering near the grain boundary. Furthermore, the supranano ordering with a larger size has an enhanced pinning effect for dislocations and stacking faults, multiplied and accumulated in grain interiors during plastic deformation. These mechanisms promote continuously increased flow stress until fracture of the alloy at 10% strain with 2.6-gigapascal tensile stress.

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3d printing of HAp/xSiO2 ceramic scaffolds for potential bone graft reconstruction 2

3D printing of HAp/xSiO2 ceramic scaffolds for potential bon...

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2021 2nd International Conference on Internet of Things, Artificial Intelligence and Mechanical Automation, IoTAIMA 2021

作者： Zhang, Chengyu Chen, Jimin Institute of Laser Engineering Faculty of Materials and Manufacturing Beijing University of Technology Beijing100124 China Ministry of Education Beijing100124 China Beijing Engineering Research Center of Laser Technology Beijing University of Technology Beijing100124 China Beijing Engineering Research Center of 3D Printing for Digital Medical Health Beijing University of Technology Beijing100124 China

HAp has drawn great attention in recent years for its similarity to the inorganic component of bone and can be used as a biocompatible implant. However, the application is limited for its poor shape ability and low degradation ability. With the help of digital Light Processing 3d printing technology, this study proposed a method for the fabrication of bone remodeling scaffolds with high complexity. In addition, this study found that the silica addition will help densify the HAp ceramic and make it transform to a more biodegradable TCP phase at low sintering temperature. © Published under licence by IOP Publishing Ltd.

关键词： 3d printers

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An osteosarcoma-on-a-chip model for studying osteosarcoma matrix-cell interactions and drug responses

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Bioactive Materials 2024年第4期34卷 1-16页

作者： Zuyan Lu XiangWan Miao Chenyu Zhang Binbin Sun Aleksander Skardal Anthony Atala Songtao Ai JiaNing Gong Yongqiang Hao Jie Zhao Kerong dai Shanghai Key Laboratory of Orthopedic Implants Department of Orthopedic SurgeryShanghai Ninth People’s HospitalShanghai Jiao Tong University School of MedicineShanghaiChina Wake Forest Institute for Regenerative Medicine Wake Forest University Health SciencesWinston-SalemNorth CarolinaUSA Department of Biomedical Engineering The Ohio State UniversityColumbusOHUSA Department of Radiology Shanghai Ninth People’s HospitalShanghai Jiao Tong University School of MedicineShanghaiChina Key Laboratory of Smart Drug Delivery Ministry of EducationSchool of PharmacyFudan UniversityShanghaiChina Clinical and Translational Research Center for 3D Printing Technology Shanghai Ninth People’s HospitalShanghai Jiao Tong University School of MedicineShanghaiChina Shanghai Frontiers Science Center of Degeneration and Regeneration in Skeletal System ShanghaiChina

Marrow niches in osteosarcoma(OS)are a specialized microenvironment that is essential for the maintenance and regulation of OS ***,existing animal xenograft models are plagued by variability,complexity,and high ***,we used a decellularized osteosarcoma extracellular matrix(dOsEM)loaded with extracellular vesicles from human bone marrow-derived stem cells(hBMSC-EVs)and OS cells as a bioink to construct a micro-osteosarcoma(micro-OS)through 3d *** micro-OS was further combined with a microfluidic system to develop into an OS-on-a-chip(OOC)with a built-in recirculating perfusion *** OOC system successfully integrated bone marrow niches,cell‒cell and cell-matrix crosstalk,and circulation,allowing a more accurate representation of OS characteristics in ***,the OOC system may serve as a valuable research platform for studying OS biological mechanisms compared with traditional xenograft models and is expected to enable precise and rapid evaluation and consequently more effective and comprehensive treatments for OS.

关键词： 3d printing Osteosarcoma-on-a-chip Organ-on-a-chip Bone marrow niches

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Evolution of Microstructure and Mechanical Properties Before and after Laser Powder Bed Fusion Preparation of Ta15 Titanium Alloy Heat Treatment

SSRN

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SSRN 2022年

作者： Pan, Yueyu Zeng, Yong Yao, Haihua Chen, Jimin Beijing University of Technology Faculty of Materials and Manufacturing Beijing100124 China Beijing Engineering Research Center of 3D Printing for Digital Medical Health Beijing100124 China

In this study, laser powder bed fusion (LPBF) technology was used to print TA15 titanium alloy powder. Formed specimens with high density (99.72%) and low surface roughness (Sa=4.195 μm) were successfully printed under optimal printing process parameters. The group of TA15 specimen phases was investigated and analyzed for micromorphology, and subsequently different heat treatments were used to enhance the overall mechanical properties of the titanium alloy. The formed specimens were internally composed mainly of acicular α' martensite structure, exhibiting high tensile strength and low toughness. After heat treatments at different annealing temperatures (820 °C, 930 °C, and 1020 °C) and holding times (1 h, 2 h, and 4 h), the microscopic of the sample changed significantly. The fine α' martensitic structure transforms into mixtures of α and β to varying degrees, resulting in a decrease in tensile strength and yield strength, and a significant increase in elongation. After holding at 820 °C for 2 h, the specimens showed the best overall mechanical properties with a tensile strength of 1103.5 MPa and elongation of 13.7%, and the fractures exhibited ductile fracture characteristics. © 2022, The Authors. All rights reserved.

关键词： Microstructure

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Evolution of Microstructure and Mechanical Properties Before and after Laser Powder Bed Fusion Preparation of Ta15 Titanium Alloy Heat Treatment

SSRN

引用

SSRN 2022年

In this study, laser powder bed fusion (LPBF) technology was used to print TA15 titanium alloy powder. Formed specimens with high density (99.72%) and low surface roughness (Sa=4.195 μm) were successfully printed under optimal printing process parameters. The group of TA15 specimen phases was investigated and analyzed for micromorphology, and subsequently different heat treatments were used to enhance the overall mechanical properties of the titanium alloy. The formed specimens were internally composed mainly of acicular α' martensite structure, exhibiting high tensile strength and low toughness. After heat treatments at different annealing temperatures (820 °C, 930 °C, and 1020 °C) and holding times (1 h, 2 h, and 4 h), the martensitic structure transforms into mixtures of α and β to varying degrees, resulting in a decrease in tensile strength and yield strength, and a significant increase in elongation. After holding at 820 °C for 2 h, the specimens showed the best overall mechanical properties with a tensile strength of 1103.5 MPa and elongation of 13.7%, and the fractures exhibited ductile fracture characteristics. © 2022, The Authors. All rights reserved.

关键词： Microstructure

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The influence of SLA process parameters on the property of alumina 7

The influence of SLA process parameters on the property of a...

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2021 7th International Forum on Manufacturing technology and engineering Materials, IFEMMT 2021

作者： Chen, Haida Chen, Bin Li, Jie Yan, Hengfeng Cheng, Liying Chen, Jimin Zeng, Yong Institute of Laser Engineering Faculty of Materials and Manufacturing Beijing University of Technology Beijing China Beijing Engineering Research Center of 3D Printing for Digital Medical Health Beijing China Beijing Intl. Science and Technology Cooperation Base of 3D Printing for Digital Medical Health Beijing China Key Laboratory of Trans-scale Laser Manufacturing Technology Ministry of Education Beijing China KANGSHUO Electric Group Co. Ltd. Beijing China

Ceramic stereolithography (SLA) was used to fabricate a ceramic. A ceramic 3d printer based on the SLA method was manufactured. In order to systematically and effectively evaluate the role of the parameters in the ceramic green body, the orthogonal test method is introduced. The placement position of the parts, the laser repetition frequency, and scanning speed are used as independent variables to be studied. The final result shows that when laser power is set, the relationship between the hardness of the part and the position of the part is not evident. The speed of laser scanning greatly influences the mechanical properties of the parts. Alumina parts with smooth surface and dense microstructure were obtained after debinding and sintering processes. © Published under licence by IOP Publishing Ltd.

关键词： Sintering

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Terms development of Additive Manufacturing 2

Terms Development of Additive Manufacturing

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2nd IEEE International Conference on digital Twins and Parallel Intelligence, dTPI 2022

作者： Tamir, Tariku Sinshaw Xiong, Gang Jiang, Jingchao 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 The Chinese University of Hong Kong Department of Mechanical and Automation Engineering 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

ISBN: (纸本)9781665492270

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. © 2022 IEEE.

关键词： 3d printers

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Text Semantic Analysis and Intelligent Interaction in Parallel dispatching Systems for Technical Station

Text Semantic Analysis and Intelligent Interaction in Parall...

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

作者： Yuantao Jiao Jian Wang Runmei Li Gang Xiong Shichao Chen School of Automation and Intelligence Beijing Jiaotong University Beijing China Beijing Engineering Research Center of Intelligent Systems and Technology Institute of Automation 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 State Key Laboratory for Multimodal Artificial Intelligence Systems Chinese Academy of Sciences Beijing China

ISBN: (数字)9798350349252

ISBN: (纸本)9798350349269

Technical station dispatching system plays an important role in cargo operation, but due to the large number of dispatching systems and complex operation, dispatchers rely on manual experience to complete the task, and many scenarios cannot be applied in the real system. Therefore, this paper utilizes the data-driven form to establish a parallel dispatching system for technical stations, semantically analyzes text data rich in dispatcher experience, completes the Computational Experiments on the textual semantic data in the artificial dispatching system, and synchronizes the Parallel Execution of data interaction with the real dispatching system.

关键词： Training Analytical models Semantics dispatching digital twins Synchronization Feeds

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