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Microstructure and mechanical properties of ultra-light Mg[sbnd]8Li[sbnd]3Al[sbnd]2Zn[sbnd]0.5Y alloy manufactured by directed energy deposition-Arc

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Journal of Magnesium and Alloys 2024年

作者： Liu, Hongjie Lu, Jiawei Huang, Yuchuan Sun, Jiawei Wu, Guohua Li, Junfeng Liu, Wencai National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai200240 China Shanghai Cloud-Manu 3D Technology Co. Ltd Shanghai201306 China

The ultra-light Mg[sbnd]8Li[sbnd]3Al[sbnd]2Zn[sbnd]0.5Y (LAZ832–0.5Y) thin wall parts with excellent performances were successfully fabricated by Gas Tungsten Arc Welding (GTAW) in this study. The microstructure of the top, middle and bottom regions of the thin wall fabricated under various conditions was examined and the mechanical properties of these thin walls were tested. The results showed that much finer microstructure was obtained by GTAW than that made by conventional casting method. In the as-deposited samples, the needle-like shaped α-Mg phase emerged at the top of the thin wall whereas the bar-shaped α-Mg phase showed up in the middle and bottom regions of the thin wall due to the complex thermal history. The Al2Y phase was dispersed throughout both α-Mg and β-Li while the AlLi phase was mainly located in the β-Li. The best combination of ultimate tensile strength (UTS), yield strength (YS) and elongation to fracture of the as-deposited thin wall were 218.9 MPa, 171.4 MPa and 20.9%, respectively, which was manufactured under the optimal condition of 120 A 1800 mm/min 220 mm/min. After solid solution treatment at 350 °C for 4 h, the UTS increased slightly by 13% but the YS increased significantly by 65% compared with the samples before solid solution. The solution of the AlLi phase was believed to be the main strengthening mechanism. It is interesting to note that the UTS and YS of the as-deposited sample was better than those of the as-cast sample while the opposite situation took place after solid solution treatment. © 2024

关键词： Microstructure

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design and Application of 3d printing Based Personalised Pelvic Prostheses

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Journal of Shanghai Jiaotong university(Science) 2021年第3期26卷 361-367页

作者： WU Junxiang LUO dinghao XIE Kai WANG Lei HAO Yongqiang Department of Orthopaedic Surgery Shanghai Ninth People’s HospitalShanghai Jiao Tong University School of MedicineShanghai200011China Medical 3D Printing Innovation Research Center for Technology Shanghai Ninth People’s HospitalShanghai Jiao Tong University School of MedicineShanghai200011China

In this paper,we describe the design and surgical process of personalised pelvic prostheses fixation through 3d printing according to different Enneking pelvic tumour zones:the ilium(Zone I),acetabulum(Zone II),and pubis and ischium(Zone III).A 3d model of the pelvis was reconstructed using imaging data,and the parameters on the planes of the acetabulum and pelvic incisal margin were *** main body of the pelvic prosthesis was constructed,a porous structure was designed on the bone-prosthesis interface,and the movement paths,lengths,and diameters of screws were *** combining the pathological model and osteotomy guide,limb salvage reconstruction was performed in patients with pelvic *** and postoperative data were compared to verify the prosthesis *** investigation revealed that the long-term survival of pelvic reconstruction prostheses depends on accurate matching with the bone defect area,good initial stability,and a porous structure to allow bone ingrowth.

关键词： pelvic prosthesis hemipelvic reconstruction personalised treatment 3d printing design solution

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Antioxidant-enriched autologous biogel promoted diabetic wound healing by remodeling inherent posttraumatic inflammatory patterning and restoring compromised microenvironment homeostasis

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Regenerative Biomaterials 2022年第1期9卷 202-218页

作者： Yixi Yang Le Wang Yonglin Zhou Yijun He Shaozhang Lin Yuwei Zeng Yunhe Zhou Wei Li Zaopeng He Qi Zhao Lihao Chen Zijie Li Wenhao Wang Zhi-Yong Zhang Translational Research Centre of Regenerative Medicine and 3D Printing of Guangzhou Medical University Guangdong Province Engineering Research Center for Biomedical EngineeringState Key Laboratory of Respiratory DiseaseThe Third Affiliated Hospital of Guangzhou Medical UniversityGuangzhou 510150P.R.China Department of Orthopaedic Surgery The Third Affiliated Hospital of Guangzhou Medical UniversityGuangzhou 510150P.R.China Medical Technology and Related Equipment Laboratory The Third Affiliated Hospital of Guangzhou Medical UniversityGuangzhou 510150P.R.China Hand and Foot Surgery&Plastic Surgery Affiliated Shunde Hospital of Guangzhou Medical UniversityShunde DistrictFoshanP.R.China

Successful wound healing depends on the reconstruction of proper tissue homeostasis,particularly in the posttraumatic inflammatory tissue *** jeopardizes tissues’immune homeostasis in cutaneous wounds,causing persistent chronic inflammation and cytokine ***,we developed an autologous regeneration factor(ARF)technology to extract the cytokine composite from autologous tissue to restore immune homeostasis and promote wound ***,treatment efficacy was significantly compromised in diabetic ***,we proposed that a combination of melatonin and ARF,which is beneficial for proper immune homeostasis reconstruction,could be an effective treatment for diabetic *** research showed that the utilization of melatonin-mediated ARF biogel(AM gel)promoted diabetic wound regeneration at a more rapid healing ***-Seq analysis showed that AM gel treatment could restore more favorable immune tissue homeostasis with unique inflammatory patterning as a result of the diminished intensity of acute and chronic ***,AM gel could be a novel and promising therapeutic strategy for diabetic wounds in clinical practice through favorable immune homeostatic reconstructions in the tissue microenvironment and proper posttraumatic inflammation patterning.

关键词： autologous regeneration factors wound healing homeostasis tissue microenvironment inflammation patterning

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Multi-scale molecular dynamics simulations and applications on mechanosensitive proteins of integrins

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Chinese Physics B 2021年第3期30卷 1-8页

作者： Shouqin Lu Qihan ding Mingkun Zhang Mian Long Center of Biomechanics and Bioengineering Key Laboratory of Microgravity(National Microgravity Laboratory)Beijing Key Laboratory of Engineered Construction and Mechanobiologyand CAS Center for Excellence in Complex System MechanicsInstitute of MechanicsChinese Academy of Sciences(CAS)Beijing 100190China School of Engineering Science University of Chinese Academy of SciencesBeijing 101408China Chongqing Engineering Research Center of High-Resolution and 3D Dynamic Imaging Technology Chongqing Institute of Green and Intelligent TechnologyChinese Academy of SciencesChongqing 400714China

Molecular dynamics simulation(MdS)is a powerful technology for investigating evolution dynamics of target proteins,and it is used widely in various fields from materials to *** mini-review introduced the principles,main preforming procedures,and advances of MdS,as well as its applications on the studies of conformational and allosteric dynamics of proteins especially on that of the mechanosensitive *** perspectives were also *** review could provide clues in understanding the potentiality of Md simulations in structure–function relationship investigation of biological proteins.

关键词： molecular dynamics simulations mechanosensitive protein allosteric dynamics integrin

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Study on the intensity of ecological land changes in seven major urban agglomerations in the Yellow River Basin

Study on the intensity of ecological land changes in seven m...

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2024 International Conference on Remote Sensing, Mapping, and Geographic Information Systems, RSMG 2024

作者： Zhang, dan Fan, Xuejiao Hu, Hao Quan, Bin Wu, Jiayuan Wu, Chaohui College of Surveying and Mapping Engineering Yellow River Conservancy Technical Institute Kaifeng475003 China Henan Provincial Engineering Research Centre for Surveying and Mapping Realistic 3D Technology Kaifeng475003 China College of Geography and Environmental Science Henan University Kaifeng475004 China Yellow River Conservancy Technical Institute Kaifeng475003 China College of Geography and Tourism Hengyang Normal University Hengyang421002 China Scientifical and Technological Innovation Center Beijing100012 China

ISBN: (纸本)9781510685826

The Yellow River Basin plays a crucial role as an ecological barrier in China. The rapid urban population growth in these agglomerations results in a continuous increase in urbanization levels, leading to a sharp rise in the demand for land for residential and public construction. As a consequence of the population surge driven by rapid urbanization, there is an increased need for food in the region. Within the arable land protection system, constraints such as "arable land occupation and compensation balance" lead to the conversion of part of eco-land into production and eco-land to compensate for losses caused by urban expansion. The current land use classification system primarily focuses on production and habitation purposes but fails to adequately consider ecological functions. This study analyzes the ecological land use changes across the seven main urban clusters within the Yellow River Basin over the past two decades, utilizing data on land use from 2000 to 2020. The analysis includes examining the spatial distribution characteristics of different land categories, quantifying level fluctuations, assessing inter-class spatial arrangement alterations, and studying shifts in land categories through quantitative, exchange, shift-level, and intensity analysis methods. By examining the trajectory of ecological land use transformation and developmental trends in these seven urban clusters, several conclusions are drawn from this study. Between 2000 and 2020, there was a discernible shift in active land utilization towards residential and industrial purposes within these clusters. In contrast, other land categories displayed a trend opposing the transition to ecological land use or the promotion of ecological resource production. Particularly noteworthy is the observed transition in the Central Plains urban clusters - initially showing a net decrease in ecological land use area from 2000 to 2020, which notably reversed into a net increase specifically between 2010 a

关键词： Abiotic

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Path Planning of Mobile Robot Based on an Improved Genetic Algorithm 2

Path Planning of Mobile Robot Based on an Improved Genetic A...

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

作者： Chen, Zenghua Xiong, Gang Liu, Sheng Shen, Zhen Li, Yue Institute of Automation Chinese Academy of Sciences State Key Laboratory for Management and Control of Complex Systems 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 Chang'an University School of Automobile Xi'an China

ISBN: (纸本)9781665492270

In order to solve the problem of premature convergence of the basic genetic algorithm when planning the robot running path, the basic genetic algorithm is improved and optimized. different population initialization methods are used to initialize multiple populations randomly, so as to improve the diversity of populations;Improve the adaptive strategy and elite strategy of crossover and mutation operators to improve the convergence speed of the algorithm;Add the path tortuosity as the planning index in the fitness function to make the planned path smoother, and add constraints to the model to avoid obstacles;Finally, through the transformation of the coding paradigm of the above improved genetic algorithm, it can run on Flink distributed cluster to obtain faster solution speed, so as to meet the efficiency requirements of path planning in large-scale robot cluster system. The optimized algorithm is compared with the basic genetic algorithm. The simulation results show that the improved algorithm is efficient in robot path planning. © 2022 IEEE.

关键词： Genetic algorithms

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Printability during projection-based 3d bioprinting

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Bioactive Materials 2022年第5期7卷 254-267页

作者： Kang Yu Xinjie Zhang Yuan Sun Qing Gao Jianzhong Fu Xiujun Cai Yong He State Key Laboratory of Fluid Power and Mechatronic Systems College of Mechanical EngineeringZhejiang UniversityHangzhou 310027China Department of General Surgery Sir Run-Run Shaw HospitalZhejiang University School of MedicineHangzhou 310016China Key Laboratory of Materials Processing and Mold Zhengzhou UniversityZhengzhou450002China Key Laboratory of 3D Printing Process and Equipment of Zhejiang Province College of Mechanical EngineeringZhejiang UniversityHangzhou 310027China Zhejiang Research and Development Engineering Laboratory of Minimally Invasive Technology and Equipment Hangzhou310016China Cancer Center Zhejiang UniversityHangzhouZhejiang 310058 China

Since projection-based 3d bioprinting(PBP)could provide high resolution,it is well suited for printing delicate structures for tissue ***,the low crosslinking density and low photo-crosslinking rate of photocurable bioink make it difficult to print fine ***,an in-depth understanding of the is ***,a research framework is established for the analysis of printability during *** gelatin methacryloyl(GelMA)-based bioink is used as an example,and the printability is systematically *** analyze the photo-crosslinking reactions during the PBP process and summarize the specific requirements of bioinks for *** standard quantized models are established to evaluate 2d and 3d printing ***,the better strategies for bioprinting five typical structures,including solid organs,vascular structures,nerve conduits,thin-wall scaffolds,and micro needles,are presented.

关键词： Projection-based printing(PBP) 3d bioprinting GelMA bioink Rheological analysis

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A Novel Solvent-Free Acrylate/Bcb drop-on-demand (dod) Inkjet 3d printing dielectric Ink with Excellent dielectric, Mechanical, and Thermal Properties

SSRN

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SSRN 2024年

作者： Liu, Haoran Wang, Chenghao Zong, Lishuai Jiang, Lingmei Zhang, Guangsheng ding, Zichun Jia, Zexian Xiao, Changhong Li, Chao Wang, Jinyan Jian, Xigao Department of Polymer Materials and Engineering Dalian University of Technology Dalian116024 China State Key Laboratory of Fine Chemicals Dalian University of Technology Dalian China Engineering Research Center of Advanced Polymer and Composite Materials Ministry of Education Dalian China Xi’an Ruite 3D Technology Inc Ltd Xian China

Currently, drop-on-demand (dOd) inkjet-printed dielectric inks used to produce next-generation high-frequency electronic devices fail to meet the requirements of circuit board substrates in terms of thermal, mechanical, and dielectric properties. To address this gap, we synthesized a low-viscosity acrylate monomer featuring an intrinsically low dielectric structure (hexafluorobisphenol A) and multiple cross-linking sites, and a benzocyclobutene monomer with low curing shrinkage and excellent thermomechanical properties. By mixing these monomers with other reactive diluents and verifying them through theoretical calculations and printing, we have developed a range of dielectric inks suitable for inkjet 3d printing. To enhance the overall performance of the cured inks, a sequential UV/thermal curing strategy was employed to form interpenetrating networks (IPNs). The optimal ink formulations met the requirements of circuit board substrates, demonstrating excellent heat resistance (Td5% = 334°C, Tg = 181°C), mechanical properties (tensile strength = 85 MPa, elongation at break = 13.5%), and dielectric properties (dk = 2.526 and df = 0.103 at 15 GHz). These formulations meet the performance requirements for circuit board substrates and lead the industry in mechanical and dielectric properties. Furthermore, the feasibility of inkjet printing heterogeneous integrated electronic devices was verified, showing excellent print resolution and continuity of the conductive network. This work provides new insights into the future development of dielectric materials for inkjet 3d printing. © 2024, The Authors. All rights reserved.

关键词： Substrates

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research on Anti-Swing Strategies for Bridge Cranes

Research on Anti-Swing Strategies for Bridge Cranes

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Chinese Automation Congress (CAC)

作者： Shiqi Wang Enguang Hou Haoyuan Zheng Yuyi Jiang Zhen Shen Gang Xiong The College of Rail Transit of Shandong Jiaotong University Jinan China Beijing Engineering Research Center of Intelligent Systems and Technology Institute of Automation Chinese Academy of Sciences Beijing China Intelligent Manufacturing Center Qingdao Academy of Intelligent Industries Qingdao China State Key Laboratory of Multimodal Artifcial Intelligence Systems 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

ISBN: (数字)9798350368604

ISBN: (纸本)9798350368611

A study is conducted on the LH5T-13.5M electric crane, focusing on the swing characteristics of the load during steel coil lifting operations and the displacement issue of the crane. Initially, the system model is formulated using the Lagrange dynamic equations, translating the practical challenges into a solvable mathematical framework and deriving the transfer function of interest. Subsequently, the development of three control strategies is elucidated, formulated on the basis of the established model: a conventional PId control system, a fuzzy PId control system, and an adaptive proportional factor fuzzy neural PId controller. These systems are simulated and validated using Simulink. A comparative experimental setup is employed to evaluate performance. The results show that when the step input signal is 1, the maximum absolute load swing Angle of the traditional PId, fuzzy PId and adaptive scale factor fuzzy neural PId controller are 0.185°, 0.054° and 0.049° respectively for the working condition 1 experiment. The percentage overshoot corresponding to the wheelbarrow is 37.1%, 40.0%, and 30.5%, respectively. The findings indicate that the introduced fuzzy neural PId controller, equipped with an adaptive scaling factor, exhibits superior stability and effectiveness in maintaining the crane's operation within the optimal range of parameters.

关键词： Bridges Fuzzy control Adaptation models Cranes PI control Adaptive systems Fuzzy neural networks Mathematical models Pd control Load modeling

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Correlation of parameters and microstructure of 3d printing bulk medical titanium-based metallic glass

Correlation of parameters and microstructure of 3D printing ...

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作者： Liu, d.H. Peng, P.C. Kuo, C.N. Department of Materials and Optoelectronic Science National Sun Yat-Sen University Kaohsiung Taiwan Department of Bioinformatics and Medical Engineering Asia University Taichung41354 Taiwan Graduate institute of biomedical sciences China Medical University Taichung40402 Taiwan 3D Printing Medical Research Center China Medical University Hospital Taichung40447 Taiwan

Metallic glass has developed over the past few decades. To fabricate the metallic glass, high cooling rates (105 K/s) is needed to form the disorder atomic structure [1]. Because metallic glass has no grain boundary, its characteristics are superior to traditional crystalline materials, such as good wear resistance, and excellent corrosion resistance [2]. In the past few decades, most amorphous alloy systems can only be manufactured to a millimeter size, causing the application difficulties [3]. due to development of 3d printing technology nowadays, it's expected to manufacture metallic glass in a larger size due to the localized melting process with a high cooling rate. due to the breakthrough in size, it can be applied to medical equipment such as scalpels, dental implants, and various implants in the future. However, the relationship between the materials, 3d printing process parameter, and microstructure evolution is still needed to be explored. Thus, in study, such relationship of Ti-based metallic glass is studied through changing parameters of scan speed and laser power to vary cooling rates and microstructure by Selective Laser Melting (SLM). The samples were examined through the X-ray diffractometer (XRd) and the scanning electron microscope (SEM) with energy disthispersive spectrometry (EdS). The composition variation and microstructure evolution during the 3d printing process was discussed in detail from the point of view of 3d printing parameter, molten pool behavior, and heat of mixing. Furthermore, the mechanical properties of metallic glass were investigated by using micro-indentation, which results showed further that the microstructure indirect effects hardness and young's modulus of the alloys. © 2022

关键词： Metallic glass

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