Metal halide perovskites(MHPs)are an emerging class of semiconductors that have demonstrated their promise at various energy frontiers.Especially,perovskite-based solar cells(PSCs)are considered as a disruptive photov...Metal halide perovskites(MHPs)are an emerging class of semiconductors that have demonstrated their promise at various energy frontiers.Especially,perovskite-based solar cells(PSCs)are considered as a disruptive photovoltaic technology with their power conversion efficiency rapidly climbing to certified 25.7%[1].展开更多
目的:探讨3D打印个性化钛网的引导骨再生(guided bone regeneration,GBR)术及富血小板纤维蛋白(platelet-rich fibrin,PRF)/Bio-Oss复合物修复牙槽骨缺损的应用。方法:纳入2021年3月至2024年2月于甘肃省中医院口腔颌面外科行GBR骨增量...目的:探讨3D打印个性化钛网的引导骨再生(guided bone regeneration,GBR)术及富血小板纤维蛋白(platelet-rich fibrin,PRF)/Bio-Oss复合物修复牙槽骨缺损的应用。方法:纳入2021年3月至2024年2月于甘肃省中医院口腔颌面外科行GBR骨增量手术的牙槽骨缺损患者68例,随机分为3D组(n=34)与传统组(n=34),3D组使用3D打印个性化钛网及PRF/BioOss复合物,传统组使用传统钛网及PRF/Bio-Oss复合物。对比2组术后2、4、6个月的牙槽骨增加高度、宽度、体积及并发症发生率。结果:3D组术后2、4、6个月的牙槽骨增加高度、宽度与传统组相比,但差异均无统计学意义(P>0.05)。3D组术后2个月、4个月的牙槽骨增加体积均高于传统组,但差异均无统计学意义(P>0.05),术后6个月时牙槽骨增加体积显著高于传统组(P<0.05)。3D组发生早期暴露、晚期暴露、总暴露、创口感染的比例均低于传统组,但差异均无统计学意义(P>0.05)。结论:3D打印个性化钛网及PRF/Bio-Oss复合物的GBR术修复牙槽骨缺损效果良好,术后6个月骨增加体积显著高于应用传统钛网的GBR术,且不影响其安全性,值得临床推广应用。展开更多
A conoscopic holography-based 3D measurement system for analyzing the defects on the surface of steel plates was introduced in this paper. The hardware, which is automated through software, performs sampling of the st...A conoscopic holography-based 3D measurement system for analyzing the defects on the surface of steel plates was introduced in this paper. The hardware, which is automated through software, performs sampling of the steel plate surface. Through the software interface,point-cloud data of the steel plate surface are obtained and reconstructed to form a 3D image of the steel plate surface. The software allows automatic analysis of steel plate surface detects through identification of the bulges and depressions. In addition, the software can also automatically calculate the defect information ,such as the deepest point, volume, opening area, opening length, and so on, thereby determining the defect size. The results determined by this 3D measurement system were found to be in good agreement with the actual values.展开更多
The biomechanical relationship between the articular cartilage defect and knee osteoarthritis (OA) has not been clearly defined. This study presents a 3D knee finite element model (FEM) to determine the effect of cart...The biomechanical relationship between the articular cartilage defect and knee osteoarthritis (OA) has not been clearly defined. This study presents a 3D knee finite element model (FEM) to determine the effect of cartilage defects on the stress distribution around the defect rim. The complete knee FEM, which includes bones, articular cartilages, menisci and ligaments, is developed from computed tomography and magnetic resonance images. This FEM then is validated and used to simulate femoral cartilage defects. Based on the obtained results, it is confirmed that the 3D knee FEM is reconstructed with high-fidelity level and can faithfully predict the knee contact behavior. Cartilage defects drastically affect the stress distribution on articular cartilages. When the defect size was smaller than 1.00cm2, the stress elevation and redistribution were found undistinguishable. However, significant stress elevation and redistribution were detected due to the large defect sizes ( 1.00cm2). This alteration of stress distribution has important implications relating to the progression of cartilage defect to OA in the human knee joint.展开更多
基金startup grants,Initiation Grant-Faculty Niche Research Areas(IG-FNRA)2020/21Interdisciplinary Matching Scheme 2020/21 of the Hong Kong Baptist University(HKBU)+1 种基金the Early Career Scheme(No.22300221)from the Hong Kong Research Grant Councilthe support of the Hong Kong Ph.D.Fellowship Scheme。
文摘Metal halide perovskites(MHPs)are an emerging class of semiconductors that have demonstrated their promise at various energy frontiers.Especially,perovskite-based solar cells(PSCs)are considered as a disruptive photovoltaic technology with their power conversion efficiency rapidly climbing to certified 25.7%[1].
文摘目的:探讨3D打印个性化钛网的引导骨再生(guided bone regeneration,GBR)术及富血小板纤维蛋白(platelet-rich fibrin,PRF)/Bio-Oss复合物修复牙槽骨缺损的应用。方法:纳入2021年3月至2024年2月于甘肃省中医院口腔颌面外科行GBR骨增量手术的牙槽骨缺损患者68例,随机分为3D组(n=34)与传统组(n=34),3D组使用3D打印个性化钛网及PRF/BioOss复合物,传统组使用传统钛网及PRF/Bio-Oss复合物。对比2组术后2、4、6个月的牙槽骨增加高度、宽度、体积及并发症发生率。结果:3D组术后2、4、6个月的牙槽骨增加高度、宽度与传统组相比,但差异均无统计学意义(P>0.05)。3D组术后2个月、4个月的牙槽骨增加体积均高于传统组,但差异均无统计学意义(P>0.05),术后6个月时牙槽骨增加体积显著高于传统组(P<0.05)。3D组发生早期暴露、晚期暴露、总暴露、创口感染的比例均低于传统组,但差异均无统计学意义(P>0.05)。结论:3D打印个性化钛网及PRF/Bio-Oss复合物的GBR术修复牙槽骨缺损效果良好,术后6个月骨增加体积显著高于应用传统钛网的GBR术,且不影响其安全性,值得临床推广应用。
文摘A conoscopic holography-based 3D measurement system for analyzing the defects on the surface of steel plates was introduced in this paper. The hardware, which is automated through software, performs sampling of the steel plate surface. Through the software interface,point-cloud data of the steel plate surface are obtained and reconstructed to form a 3D image of the steel plate surface. The software allows automatic analysis of steel plate surface detects through identification of the bulges and depressions. In addition, the software can also automatically calculate the defect information ,such as the deepest point, volume, opening area, opening length, and so on, thereby determining the defect size. The results determined by this 3D measurement system were found to be in good agreement with the actual values.
基金the National Natural Science Foundation of China (No. 81071235)the Medicine and Engineering Interdisciplinary Fund of Shanghai Jiaotong University (No. YG2010MS26)
文摘The biomechanical relationship between the articular cartilage defect and knee osteoarthritis (OA) has not been clearly defined. This study presents a 3D knee finite element model (FEM) to determine the effect of cartilage defects on the stress distribution around the defect rim. The complete knee FEM, which includes bones, articular cartilages, menisci and ligaments, is developed from computed tomography and magnetic resonance images. This FEM then is validated and used to simulate femoral cartilage defects. Based on the obtained results, it is confirmed that the 3D knee FEM is reconstructed with high-fidelity level and can faithfully predict the knee contact behavior. Cartilage defects drastically affect the stress distribution on articular cartilages. When the defect size was smaller than 1.00cm2, the stress elevation and redistribution were found undistinguishable. However, significant stress elevation and redistribution were detected due to the large defect sizes ( 1.00cm2). This alteration of stress distribution has important implications relating to the progression of cartilage defect to OA in the human knee joint.
