检索结果-内蒙古大学图书馆

SSRN 2024年

作者： Zhang, Siyu Sun, Chu Fan, Wei Zhang, Qiang Feng, Zhe Hao, Zhiwei Tan, Hua Zhang, Fengying Lin, Xin State Key Laboratory of Solidification Processing Northwestern Polytechnical University Shaanxi Xi’an710072 China Key Laboratory of Metal High Performance Additive Manufacturing and Innovative Design MIIT China Northwestern Polytechnical University Shaanxi Xi’an710072 China Beijing Institute of Aeronautical Materials Co. Ltd Beijing100094 China Singapore Centre for 3D Printing School of Mechanical and Aerospace Engineering Nanyang Technological University Singapore639798 Singapore Suzhou Laboratory Jiangsu Suzhou215123 China School of Material Science and Engineering Chang'an University Xi'An710064 China

The preparation of Al-Li alloy by laser powder bed fusion (LPBF) technology, especially Al-Li alloy with high Li content, is of great significance for lightweight of aerospace equipment. However, the significant susceptibility of Al-Li alloys to hot cracking during the process limits their advancement. This study starts from the two aspects of process control and composition modification, to achieve the production of crack-free and high-quality 1460 Al-Li alloys. Crack-free 1460 specimens can only be prepared at extremely low scanning velocity. The process window is markedly expanded by Sc/Zr modification. The heterogeneous nucleation of Al3(Li,Sc,Zr) results in significant grain refinement and effectively suppresses crack initiation and propagation. The unique bimodal heterogeneous microstructure endows the alloy with notable mechanical properties. After the addition of 0.6Sc-0.3Zr, the ultimate tensile strength (UTS), yield strength (YS), and elongation (δ) of 1460 alloy are increased by 104%, 158%, and 43.9%, respectively. The strength-plasticity synergism is primarily attributed to grain refinement strengthening, precipitation strengthening, and hetero-deformation induced strain hardening resulting from its unique bimodal heterogeneous microstructure. The UTS and YS of 1.2Sc-0.6Zr modified 1460 alloy increased by 156% and 279%, respectively. However, this further increase in the Sc/Zr content significantly deteriorates the plasticity of the alloy. This work establishes a foundation for advancing the use of Al-Li alloys in high-performance, lightweight, and complex aerospace structures. © 2024, The Authors. All rights reserved.

关键词： Microstructure

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Co-Encapsulation of Hydrophilic and Hydrophobic Bioactives Stabilized in Nanostarch-Assisted Emulsion Gel as Inner Core of Coaxial 3d Printing

SSRN

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SSRN 2024年

作者： Niu, Ruihao Su, Jia Huang, Xiao Chen, Qihe Huang, Zhaojing Cheng, Huan Yin, Jun Zhou, Jianwei Xu, Enbo Liu, donghong Zhao, Runan Hu, Haohao Yu, Xinyao College of Biosystems Engineering and Food Science National-Local Joint Engineering Laboratory of Intelligent Food Technology and Equipment Zhejiang Key Laboratory for Agro-Food Processing Integrated Research Base of Southern Fruit and Vegetable Preservation Technology Fuli Institute of Food Science Zhejiang University Hangzhou310058 China Ningbo Research Institute Zhejiang University Ningbo315100 China Innovation Center of Yangtze River Delta Zhejiang University Jiaxing314102 China State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang University Hangzhou310058 China Key Laboratory of 3D Printing Process and Equipment of Zhejiang Province School of Mechanical Engineering Zhejiang University Hangzhou310028 China Shanxi Normal University China Zhejiang University China

3d printing technology, especially coaxial 3d mode of multiple-component shaping, has great potential in the manufacture of personalized nutritional foods. However, the integration and stabilization of functional objectives different in nature is still a challenge for 3d customized foods. Here, we using starch nanoparticle (SNP) assisted soy protein (SPI) emulsion gel to load with the typical hydrophilic and hydrophobic bioactives (anthocyanin, AC, and curcumin, Cur, respectively). The addition of SNP significantly improved the storage stability of the emulsion. Xanthan gum (XG) was also added to the SNP/SPI system to enhance its rheology and form an emulsion gel as inner core of coaxial 3d printing. LF-NMR and emulsification analyses showed that AC/Cur@SNP/SPI/XG functional inner core had a strong water binding state and good stability. After printing with outer layer, the SNP/SPI coaxial sample had the lowest deviation rate of 0.8%. Also, SNP/SPI coaxial sample showed higher anthocyanin (90.2%) and curcumin (90.8%) retention compared to pure starch (S), pure SNP, pure SPI, and S/SPI samples as well as SNP/SPI sample printed without outer layer. In summary, this study provides a new perspective for the manufacture of customized products as multifunctional foods, feeds and even potential delivery of drugs. © 2024, The Authors. All rights reserved.

关键词： Anthocyanins

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Topological Polymeric Glucosyl Nanoaggregates In Scaffold Enhance Piscine Myofiber density and Orientation

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SSRN 2024年

作者： Niu, Ruihao Xin, Qipu Lao, Jihui Huang, Xiao Chen, Qihe Yin, Jun Chen, Jun Liu, donghong Xu, Enbo College of Biosystems Engineering and Food Science National-Local Joint Engineering Laboratory of Intelligent Food Technology and Equipment Zhejiang Key Laboratory for Agro-Food Processing Integrated Research Base of Southern Fruit and Vegetable Preservation Technology Fuli Institute of Food Science Zhejiang University Hangzhou310058 China College of Life Sciences Zhejiang University Hangzhou310058 China Key Laboratory of 3D Printing Process and Equipment of Zhejiang Province School of Mechanical Engineering Zhejiang University Hangzhou310028 China Innovation Center of Yangtze River Delta Zhejiang University Jiaxing314102 China State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang University Hangzhou310058 China MOE Key Laboratory of Biosystems Homeostasis & Protection Zhejiang University Hangzhou China Cancer Center Zhejiang University Hangzhou China

Upon the pressure of conventional land agriculture and marine environment facing the future of human beings, the emerging of alternative proteins represented by cultured meat is expected with a breakthrough of efficient, safe and sustainable production. However, the cell proliferation efficiency and final myofiber density in current animal-derived scaffolds are still limited. Here, we incorporated five plant-derived edible polymeric glucosyl nanoparticles (GNPs) into gelatin alginate hydrogels to form nanoaggregates with nanotopographies inside. The nano-scale topological morphology significantly enhances the adhesion and proliferation efficiencies of piscine satellite cells (PSCs) in the scaffold. Mechanically, the presence of GNP nanoaggregate increases the interaction between ITG-A1 (membrane protein of PSCs) and hydrogel microenvironment, which activates the focal adhesion-integrin-cytoskeleton mechanotransduction signaling to promote cell proliferation. With a controlled diameter, these GNPs can also improve the density, alignment and differentiation efficiency of PSCs. When cultured in vitro for 15 days, the diameter, cell density and orientation of muscle fibers in the GNP-stimulated cultured fish fillet are very similar to native fish muscle tissue. © 2024, The Authors. All rights reserved.

关键词： Nanoparticles

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Sacrificial microgel‑laden bioink‑enabled 3d bioprinting of mesoscale pore networks

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Bio-design and Manufacturing 2020年第1期3卷 30-39页

作者： Lei Shao Qing Gao Chaoqi Xie Jianzhong Fu Meixiang Xiang Zhenjie Liu Liulin Xiang Yong He State Key Laboratory of Fluid Power and Mechatronic Systems College of Mechanical EngineeringZhejiang UniversityHangzhou 310027China Key Laboratory of 3D Printing Process and Equipment of Zhejiang Province College of Mechanical EngineeringZhejiang UniversityHangzhou 310027China Department of Cardiology The Second Affiliated Hospital of Zhejiang UniversitySchool of MedicineHangzhou 310009China Department of Vascular Surgery The Second Affiliated Hospital of Zhejiang UniversitySchool of MedicineHangzhou 310009China Zhejiang University Hospital Zhejiang UniversityHangzhou 310027ZhejiangChina Key Laboratory of Materials Processing and Mold Zhengzhou UniversityZhengzhou 450002China

Three-dimensional(3d)bioprinting is a powerful approach that enables the fabrication of 3d tissue constructs that retain complex biological ***,the dense hydrogel networks that form after the gelation of bioinks often restrict the migration and proliferation of encapsulated ***,a sacrificial microgel-laden bioink strategy was designed for directly bioprinting constructs with mesoscale pore networks(MPNs)for enhancing nutrient delivery and cell *** sacrificial microgel-laden bioink,which contains cell/gelatin methacryloyl(GelMA)mixture and gelled gelatin microgel,is first thermo-crosslinked to fabricate temporary predesigned cell-laden constructs by extrusion bioprinting onto a cold ***,the construct is permanently stabilized through photo-crosslinking of *** MPNs inside the printed constructs are formed after subsequent dissolution of the gelatin *** MPNs allowed for effective oxygen/nutrient diffusion,facilitating the generation of bioactive ***,osteoblast and human umbilical vein endothelial cells encapsulated in the bioprinted large-scale constructs(≥1 cm)with MPNs showed enhanced bioactivity during *** 3d bioprinting strategy based on the sacrificial microgel-laden bioink provided a facile method to facilitate formation of complex tissue constructs with MPNs and set a foundation for future optimization of MPN-based tissue constructs with applications in diverse areas of tissue engineering.

关键词： Sacrificial microgel Gelatin methacryloyl(GelMA) 3d bioprinting Mesoscale pore networks(MPNs) Tissue engineering

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Topological Polymeric Glucosyl Nanoaggregates in Scaffold Enable High-density Piscine Muscle Tissue

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SSRN 2024年

作者： Niu, Ruihao Su, Jia Lao, Jihui Yin, Jun Liu, donghong Chen, Qihe Huang, Xiao Xu, Enbo Xin, Qipu Chen, Jun College of Biosystems Engineering and Food Science National-Local Joint Engineering Laboratory of Intelligent Food Technology and Equipment Zhejiang Key Laboratory for Agro-Food Processing Integrated Research Base of Southern Fruit and Vegetable Preservation Technology Fuli Institute of Food Science Zhejiang University Hangzhou310058 China College of Life Sciences Zhejiang University Hangzhou310058 China Key Laboratory of 3D Printing Process and Equipment of Zhejiang Province School of Mechanical Engineering Zhejiang University Hangzhou310028 China Innovation Center of Yangtze River Delta Zhejiang University Jiaxing314102 China State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang University Hangzhou310058 China MOE Key Laboratory of Biosystems Homeostasis & Protection Zhejiang University Hangzhou China Cancer Center Zhejiang University Hangzhou China Shanxi Normal University China

关键词： Nanoparticles

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Self-supervised depth denoising Using Lower- and Higher-quality RGB-d sensors

arXiv

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arXiv 2020年

作者： Shabanov, Akhmedkhan Krotov, Ilya Chinaev, Nikolay Poletaev, Vsevolod Kozlukov, Sergei Pasechnik, Igor Yakupov, Bulat Sanakoyeu, Artsiom Lebedev, Vadim Ulyanov, dmitry In3D Russia Skoltech Russia Samsung AI Center Moscow Russia Heidelberg Col-laboratory for Image Processing Germany

Consumer-level depth cameras and depth sensors embedded in mobile devices enable numerous applications, such as AR games and face identification. However, the quality of the captured depth is sometimes insufficient for 3d reconstruction, tracking and other computer vision tasks. In this paper, we propose a self-supervised depth denoising approach to denoise and refine depth coming from a low quality sensor. We record simultaneous RGB-d sequences with unzynchronized lower- and higher-quality cameras and solve a challenging problem of aligning sequences both temporally and spatially. We then learn a deep neural network to denoise the lower-quality depth using the matched higher-quality data as a source of supervision signal. We experimentally validate our method against state-of-the-art filtering-based and deep denoising techniques and show its application for 3d object reconstruction tasks where our approach leads to more detailed fused surfaces and better tracking. Copyright © 2020, The Authors. All rights reserved.

关键词： Cameras

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Visualization, Modeling and Analysis of Salmon Muscle Structure: Based on Micro-Ct

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SSRN 2022年

作者： Zhu, Yiyuan Xu, Enbo Yin, Jun Xu, Weidong Liu, donghong College of Biosystems Engineering and Food Science National Engineering Laboratory of Intelligent Food Technology and Equipment Innovation Center of YangtzeRiverDelta Zhejiang Key Laboratory for Agro-Food Processing Fuli Institute of Food Science Zhejiang University Hangzhou310058 China The State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang University Hangzhou310028 China School of Mechanical Engineering Key Laboratory of 3D Printing Process and Equipment of Zhejiang Province School of Mechanical Engineering Zhejiang University Hangzhou310028 China Ningbo Research Institute Zhejiang University Ningbo315100 China

Seafood analogs using culture cell or plant-based materials are rising for future food supply, but the bionic design of them is still an issue of finely simulating the multiscale structure and function of fishes. For salmon, we compared the back, belly and tail tissues via microcomputed tomography (micro-CT) scanning with optimized tissue contrast and spatial resolution. The optimum staining conditions of salmon muscle tissue for micro-CT was 3.75% IKI (iodine-potassium iodide) solution for 7 days, and the muscle could be separated well from fat and connective tissue. The results of visualization analysis were correlated with the texture profile analysis. A relatively high magnification (3 µm/pixel) was used with fiber tracing procedure to analyze the connection of muscle fiber bundles surrounded by soft tissue. Single muscle fiber (e.g., diameter 39 µm) was successfully and artificially separated from whole visualized tissue through manual division. Overall, this study proved a novel ultra-high-resolution method based on micro-CT to conduct digital analysis of muscle fascicle architecture, and constructed printable model of bionic animal/plant tissue for food design. © 2022, The Authors. All rights reserved.

关键词： Textures

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MRI susceptibility artefacts caused by orthodontic wire

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dentomaxillofacial Radiology 2024年第6期53卷 396-406页

作者： Iwamoto, Yuri Shimamoto, Hiroaki Felemban, doaa Terai, Tomoyuki Kreiborg, Sven Mallya, Sanjay M. Yang, Fan-Pei Gloria Tanikawa, Chihiro Murakami, Shumei Department of Oral and Maxillofacial Radiology Osaka University Graduate School of Dentistry Suita 565-0871 Japan Department of Oral Basic and Clinical Sciences College of Dentistry Taibah University Medina 43353 Saudi Arabia Department of Materials Science and Engineering Graduate School of Engineering Osaka University Suita Osaka 565-0871 Japan Department of Pediatric Dentistry and Clinical Genetics School of Dentistry Faculty of Health and Medical Sciences University of Copenhagen Copenhagen DK-2200 Denmark School of Dentistry University of Copenhagen 3D Craniofacial Image Research Laboratory Centre of Head and Orthopedics Copenhagen University Hospital Rigshospitalet Department of Applied Mathematics and Computer Science Technical University of Denmark Copenhagen DK-2200 Denmark Section of Oral and Maxillofacial Radiology UCLA School of Dentistry Los Angeles 90095-1668 CA United States Department of Foreign Languages and Literature National Tsing Hua University Hsinchu 300013 Taiwan Center for Cognition and Mind Sciences National Tsing Hua University Hsinchu 300013 Taiwan Department of Orthodontics and Dentofacial Orthopedics Graduate School of Dentistry Osaka University Suita 565-0871 Japan

Objectives: To evaluate magnetic susceptibility artefacts produced by orthodontic wires on MRI and the influence of wire properties and MRI image sequences on the magnitude of the artefact. Methods: Arch form orthodontic wires [four stainless steels (SS), one cobalt chromium (CC) alloy, 13 titanium (Ti) alloys] were embedded in a polyester phantom, and scanned using a 1.5-T superconducting magnet scanner with an eight-channel phased-array coil. All wires were scanned with T1-weighted spin echo (SE) and gradient echo (GRE) sequences according to the American Society for Testing and Materials (ASTM) F2119-07 standard. The phantom also scanned other eight sequences. Artefacts were measured using the ASTM F2119-07 definition and OsiriX software. Artefact volume was analysed according to metal composition, wire length, number of wires, wire thickness, and imaging sequence as factors. Results: With SE/GRE, black/white artefacts volumes from all SS wires were significantly larger than those produced by CC and Ti wires (P<.01). With the GRE, the black artefacts volume was the highest with the SS wires. With the SE, the black artefacts volume was small, whereas white artefacts were noticeable. The cranio-caudal extent of the artefacts was significantly longer with SS wires (P<.01). Although a direct relationship of wire length, number of wires, and wire thickness with artefact volume was noted, these factors did not influence artefact extension in the cranio-caudal direction. Conclusions: Ferromagnetic/paramagnetic orthodontic wires create artefacts due to local alteration of magnetic field homogeneity. The SS-type wires produced the largest artefacts followed by CC and Ti. © The Author(s) 2024.

关键词： artefacts image sequences magnetic susceptibility MRI orthodontic wire

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MR appearance of a rare ameloblastic fibroma with formation of dental hard tissues with histopathologic correlation: a case report

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Oral Radiology 2023年第1期39卷 220-224页

作者： Hamamoto, Makihito Shimamoto, Hiroaki Oya, Kaori Fukuda, Yasuo Kreiborg, Sven Mallya, Sanjay M. Yang, Fan-pei Gloria Murakami, Shumei Department of Oral and Maxillofacial Radiology Osaka University Graduate School of Dentistry 1-8 Yamadaoka Osaka Suita 565-0871 Japan Clinical Laboratory Osaka University Dental Hospital 1-8 Yamadaoka Osaka Suita 565-0871 Japan Department of Pediatric Dentistry and Clinical Genetics School of Dentistry Faculty of Health and Medical Sciences University of Copenhagen Nørre Allé 20 Copenhagen 2200 Denmark 3D Craniofacial Image Research Laboratory School of Dentistry University of Copenhagen Copenhagen Denmark Centre of Head and Orthopedics Copenhagen University Hospital Rigshospitalet Copenhagen Denmark Department of Applied Mathematics and Computer Science Technical University of Denmark Nørre Allé 20 Copenhagen 2200 Denmark Section of Oral and Maxillofacial Radiology UCLA School of Dentistry 10833 Le Conte Ave. Los Angeles 90095-1668 CA United States Department of Foreign Languages and Literature National Tsing Hua University No.101 Section 2 Guangfu Rd. East District Hsinchu 300013 Taiwan Center for Cognition and Mind Sciences National Tsing Hua University No.101 Section 2 Guangfu Rd. East District Hsinchu 300013 Taiwan

An ameloblastic fibroma with formation of dental hard tissues, which the classical name is ameloblastic fibro-odontoma (AFO), is a rare type of mixed odontogenic tumor. An 8-year-old boy was diagnosed with AFO, with an inhomogeneous high signal within the lesion shown by T2-weighted magnetic resonance imaging (MRI). Computed tomography (CT) imaging revealed a unilocular low CT value area of 24 × 19 × 26 mm with buccolingual bony expansion and cortical bone thinning on the left side of the mandible including the crown of the mandibular left second molar. In addition, multiple calcified bodies were detected within the lesion, one of which had a CT value of approximately 2200 HU, equivalent to that of enamel. MRI indicated the lesion to be sized 24 × 19 × 25 mm along with buccolingual bony expansion in the left side of the mandible. Additionally, the lesion showed an internal inhomogeneous high signal, while a portion had an especially high signal in T2-weighted images. That particularly high signal area coincided with the nodular growth area of mucus-rich mesenchymal components without the epithelial component in histopathology findings. The particularly high signal revealed by T2-weighted imaging could be attributed to the mucus-rich component. MRI was found useful for revealing differences in the internal histopathological properties of an AFO in our patient. © 2022, The Author(s) under exclusive licence to Japanese Society for Oral and Maxillofacial Radiology.

关键词： Ameloblastic fibro-odontoma Ameloblastic fibroma Benign tumor Hamartoma MRI

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Fatigue Properties of Ti-6al-4v Gyroid Graded Lattice Structures in Comparison with Uniform Counterparts Fabricated by Selective Laser Melting

SSRN

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SSRN 2021年

作者： Yang, Lei Wu, Shiqi Chen, Peng Zhang, Lei Han, Changjun Cai, Chao Wen, Shifeng Zhou, Yan Yan, Chunze Shi, Yusheng State Key Laboratory of Materials Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology China State Key Laboratory of Materials Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology China State Key Laboratory of Materials Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology China State Key Laboratory of Materials Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology China Singapore Centre for 3D Printing School of Mechanical and Aerospace Engineering Nanyang Technological University Singapore State Key Laboratory of Materials Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology China State Key Laboratory of Materials Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology China State Key Laboratory of Materials Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology China State Key Laboratory of Materials Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology China State Key Laboratory of Materials Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology China

Graded lattice structures (GLSs) have drawn much attention in engineering and biological areas due to the enhanced mechanical properties and energy absorption capacity that benefited from the graded porosity design. The aim of this study is to investigate the effect of gradient on fatigue behaviours of lattice structures. A GLS consisted of the Gyroid unit cell, one of the triply periodic minimal surface structures, was designed with continuously varied porosity from 60% to 90%. Uniaxial compressive testing and compression-compression fatigue testing were conducted on the Ti-6Al-4V Gyroid lattice structures with both uniform and graded porosity fabricated by selective laser melting. All three typical fracture modes and mixed fracture modes were all observed on the fracture surfaces of struts after fatigue testing. The fatigue life of Gyroid GLSs is 1.21~1.67 times that of uniform counterparts with an identical overall porosity. The enhancement mechanism on fatigue properties coming from gradient design is elaborated through finite element analysis and experimental characterization. The lower level of tensile stress, bigger macro-area and micro-plastic zone on the strut surface of the main loading-bearing constituent of Gyroid GLS relieve the stress concentration around the crack tip, thus, lower the crack propagation rate and provide stronger fatigue crack resistance. Furthermore, the struts in the main loading-bearing constituent are more prone to stretching, therefore, provide long-term carrying capacity even after the occurrence of penetrating cracks. Experiment results show that the carrying capacity can be still provided by these struts even with penetrating cracks. © 2021, The Authors. All rights reserved.

关键词： Porosity

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