检索结果-内蒙古大学图书馆

31st National and 9th International Iranian Conference on biomedical engineering, ICBME 2024

作者： Zadeh-Posti, Mohammad Hosein Kamal, Zeinab Rajaeirad, Mohadese Einafshar, Mohammadjavad Matin Jamshidi, Nima University of Guilan Faculty of Mechanical Engineering Rasht Iran Amirkabir University of Technology Department of Biomedical Engineering Tehran Iran University of Isfahan Faculty of Engineering Department of Biomedical Engineering Isfahan Iran

ISBN: (纸本)9798331529710

Adolescent Idiopathic Scoliosis (AIS) is a condition marked by an abnormal curvature of the spine. This study aims to model AIS using computational techniques to analyze varying bone densities within vertebrae under different muscle paralysis conditions. The aim is to investigate how unilateral muscle paralysis affects bone density and to model conditions similar to AIS. A three-dimensional model of the L2 vertebra was created using Mimics and 3-matic software for segmentation and meshing. The model was imported into ABAQUS for further integration and assignment of properties. The bone remodeling algorithm was applied over 12 months, simulating the intact scoliosis (IS) condition. Loading conditions specific to IS were applied, and three scenarios of muscle paralysis were modeled: longissimus pars thoracic (LGPT) muscle paralysis, multifidus lumborum (MFL) muscle paralysis, and both muscles' paralysis. The current study found variable bone density and Young's modulus distributions for cancellous and cortical bones in the AIS model. Trabecular bone density varied between 0.297 and 0.317g/cm3, with Young's modulus ranging from 99.61 to 115.83 MPa. Cortical bone density ranged from 1.466 to 1.665 g/cm3, while Young's modulus was between 11,794 and 16,110 MPa. The highest von Mises stress was observed in the cortical bone, particularly in the concave region, which is under higher compression in AIS patients than healthy spines. The results of this study support Frost's mechanostat theory, suggesting that uneven loading leads to higher bone density on the concave side of scoliotic vertebrae. The study demonstrates the feasibility of using computational models to simulate AIS and highlights the significance of muscle conditions on bone remodeling and stress distribution in vertebrae. © 2024 IEEE.

关键词： ABAQUS

来源：评论

学校读者我要写书评

暂无评论

POLYPROPYLENE AND GLASS FIBER COMPOSITE EXTRUSION FOR ADDITIVE BIOFABRICATION OF BONE TISSUE SCAFFOLDS WITH COMPLEX MICROSTRUCTURES 19

POLYPROPYLENE AND GLASS FIBER COMPOSITE EXTRUSION FOR ADDITI...

引用

ASME 2024 19th International Manufacturing Science and engineering Conference, MSEC 2024

作者： Al-Qawasmi, Hamzeh Risch, Sebastian James Salary, Roozbeh Department of Biomedical Engineering Marshall University HuntingtonWV25755 United States Mechanical Engineering Department Biomedical Engineering Department Marshall University HuntingtonWV25755 United States

ISBN: (纸本)9780791888100

Osseous fractures account for 16% of all musculoskeletal injuries in the U.S. annually. Various tissue engineering methods have emerged for bone repair, including additive biomanufacturing techniques like extrusion-based bioprinting. Despite technological and scientific advances in bone tissue engineering, it has remained unknown how the complex rheological dynamics of composite material deposition affect the functional properties of fabricated bone scaffolds. The goal of this work is to fabricate mechanically robust, dimensionally accurate, and biocompatible tissue scaffolds for treatment of bone fractures. The objectives of the work are to investigate the influence of (i) single-screw filament extrusion temperature and (ii) internal scaffold microstructures, on the physical and mechanical properties of bone scaffolds, fabricated using fused deposition modeling (FDM). Uniform monofilaments of polypropylene (PP) and glass fibers (GF) were extruded at temperatures of 185 °C, 210 °C, and 235 °C, then used to fabricate porous bone scaffolds via FDM. Also, four scaffolds with bone-like microstructures were designed, based on novel mathematical formulations of triply periodic minimal surfaces (TPMS). The physical and mechanical properties of these scaffolds were characterized to identify optimal fabrication and design parameters. Among the four TPMS designs constructed, Design #2 exhibited the highest compression modulus, attributed to its compact microstructure. Besides, extrusion temperatures of 210 °C and 235 °C had similar effects on scaffold properties compared to 185 °C. These findings contribute to the development of clinically viable bone scaffolds and future advancements in regenerative medicine. © 2024 by ASME.

关键词： Regenerative medicine

来源：评论

学校读者我要写书评

暂无评论

The Role of Porosity in Improving the Biomechanical Performance of Total Knee Arthroplasty: A Finite Element Perspective 31

The Role of Porosity in Improving the Biomechanical Performa...

引用

31st National and 9th International Iranian Conference on biomedical engineering, ICBME 2024

作者： Rashidi, Farid Rajaeirad, Mohadese Bahrami, Mohsen Sadeghnejad, Soroush Amirkabir University of Technology Department of Mechanical Engineering Tehran Iran University of Isfahan Faculty of Engineering Department of Biomedical Engineering Isfahan Iran

ISBN: (纸本)9798331529710

Total Knee Arthroplasty (TKA) aims to relieve knee dysfunction caused by osteoarthritis or injury, but its success is hindered by implant failure. This study examines the impact of implant porosity on the biomechanical performance of TKA implants. We utilized Finite Element Analysis (FEA) to evaluate the biomechanical performance of porous TKA implants under realistic loading conditions. A 3D patient-specific model of a knee joint was created from CT scans of a 35-year-old male. The commercial TKA CR model (Sigma edR FixedBearing Knees - DePuy Synthes) was designed using CATIA software. The bone models were assigned inhomogeneous material properties based on Hounsfield units from CT images. The FEA model included 66680 nodes and 399427 elements for bone tissues and 30996 nodes, 9890 linear hexahedral, and 129860 linear tetrahedral elements for implant components. The results revealed that implant porosity significantly affects stress distribution. Implants with 2 5% porosity demonstrated optimal stress distribution, reducing von Mises stress in both femoral and tibial components. Higher porosity levels (e.g., 60%) risked implant failure due to reduced compressive yield strength. Porosity in TKA implants enhances biomechanical performance by improving stress distribution and reducing stress shielding. A 2 5% porosity level is optimal, balancing biomechanical benefits and structural integrity, potentially leading to better patient outcomes and longer implant lifespans. © 2024 IEEE.

关键词： Compressive strength

来源：评论

学校读者我要写书评

暂无评论

The Effect of Dimple-Based TMJ Design and Its Biomechanical Effect on Reducing Stress

引用

Journal of Long-Term Effects of Medical Implants 2025年第2期35卷 33-39页

作者： Dommeti, Vamsi Krishna Rajaeirad, Mohadese Jamshidi, Nima Roy, Sandipan Department of Mechanical Engineering SRM Institute of Science and Technology Kattankulathur Kanchipuram Tamil Nadu Chennai603203 India Department of Biomedical Engineering University of Isfahan Isfahan81746-73441 Iran

Temporomandibular joint (TMJ) disorders significantly impact orofacial health and quality of life, necessitating effective interventions. This study presents a comprehensive finite element analysis (FEA) focusing on the design and material modifications of temporomandibular joint implants, with the aim of improving their long-term stability and performance. Accurate mandible models extracted from Computational Tomography (CT) scans were used to create three variations of implants, each attached using varying screw configurations ranging from 2 to 5 for each analysis. The variations included implants without dimples, implants with 10% dimples, and implants with 20% dimples. The FEA considered material properties of Titanium and Ti-Nb-Zr alloy for the implants. The FEA results revealed that for 10% dimples models, equivalent stress was reduced by 6.25% with two screws fixation and further decreased by 14.28% with three screws, irrespective of the implant volume, reaffirming the significance of screw fixation. The model secured with three screws exhibited the least amount of stress for both titanium and zirconium alloys and dimple implants showed promise in reducing stress levels, particularly in low bone density conditions. These findings not only underscore the potential advantages of dimple implants in facilitating bone in growth and stability at the bone-implant interface but also highlight the pivotal role of implant dimples in modulating stress levels. The study contributes valuable insights for future advancements in TMJ implantology, offering potential optimizations for implant design and clinical outcomes. © 2025 by Begell House, Inc.

关键词： Binary alloys

来源：评论

学校读者我要写书评

暂无评论

Investigate the aluminium 1050-H4 microstructure, hardness, and wear characteristics when reinforced with maize cob particles 13

Investigate the aluminium 1050-H4 microstructure, hardness, ...

引用

13th Global Conference on Materials Science and engineering, CMSE 2024

作者： Pita, M. Lebea, L. Department of Mechanical Bioresources and Biomedical Engineering Faculty of Engineering and Technology University of South Africa South Africa Department of Mechanical Engineering and Mechatronics Faculty of Engineering Built and Technology Central University of Technology South Africa

One of the effects of creating composite materials, which are classified as advanced materials, is a change to their mechanical properties. In this study, the effect of reinforcing aluminium 1050-H4 using corn-cob particles were investigated. Prior to being examined using scanning electron microscopy (SEM), the corn cob was crushed and milled in the experiment using a Aimil machine. The hardness, microstructure and wear behavior test were carried out. The aluminium alloy reinforced with corn cob particles of two distinct diameters, © Published under licence by IOP Publishing Ltd.

关键词： Microstructure

来源：评论

学校读者我要写书评

暂无评论

Inhibiting scar formation via wearable multilayer stacked electret patch:Self-creation of persistent and customizable DC electric field for fibrogenic activity restriction

引用

InfoMat 2024年第3期6卷 66-80页

作者： Sung-Won Kim Sumin Cho Donghan Lee Jiyu Hyun Sunmin Jang Inwoo Seo Hyun Su Park Hee Jae Hwang Hyung-Seop Han Dae Hyeok Yang Heung Jae Chun Suk Ho Bhang Dongwhi Choi School of Chemical Engineering Sungkyunkwan UniversitySuwonRepublic of Korea Department of Mechanical Engineering(Integrated Engineering Program) Kyung Hee UniversityYonginGyeonggiRepublic of Korea Biomaterials Research Center Biomedical Research DivisionKorea Institute of Science and Technology(KIST)SeoulRepublic of Korea Department of Medical Life Sciences College of MedicineInstitute of Cell and Tissue EngineeringThe Catholic University of KoreaSeoulRepublic of Korea

Electrical stimulation has recently received attention as noninvasive treatment in skin wound healing with its outstanding biological property for clinical ***,the complexity of equipment for applying appropriate electrical stimulation remains an ongoing ***,we proposed a strategy for skin scar inhibition by providing electrical stimulation via a multilayer stacked electret(MS-electret),which can generate direct current(DC)electric field(EF)without any power supply *** addition,the MS-electret can easily control the intensity of EFs by simply stacking electret layers and maintain stable EF with the surface potential of 3400 V over 5 days owing to the injected charges on the electret *** confirmed inhibition of type 1 collagen andα-SMA expression of human dermal fibroblasts(hDFs)by 90%and 44%in vitro,indicating that the transition of hDFs to myofibroblasts was restricted by applying stable electrical *** further revealed a 20%significant decrease in the ratio of myofibroblasts caused by the MS-electret in *** findings present that the MS-electret is an outstanding candidate for effective skin scar inhibition with a battery-free,physiological electrical microenvironment,and noninvasive treatment that allows it to prevent external infection.

关键词： DC electric field dermal fibroblasts electret scar formation restriction self-creation of electrical stimulation

来源：评论

学校读者我要写书评

暂无评论

INVESTIGATION OF MATERIAL TRASPORT THROUGH TRIPLY PERIODIC MINIMAL SURFACE (TPMS) BONE SCAFFOLDS USING COMPUTATIONAL FLUID DYNAMICS (CFD) 19

INVESTIGATION OF MATERIAL TRASPORT THROUGH TRIPLY PERIODIC M...

引用

ASME 2024 19th International Manufacturing Science and engineering Conference, MSEC 2024

作者： Coburn, Brandon Salary, Roozbeh Department of Mechanical Engineering Marshall University HuntingtonWV25755 United States Department of Mechanical Engineering Department of Biomedical Engineering Marshall University HuntingtonWV25755 United States

ISBN: (纸本)9780791888100

Cell-laden, scaffold-based tissue engineering methods have been successfully utilized for the treatment of bone fractures and diseases, caused by factors such as trauma, tumors, congenital anomalies, and aging. In such methods, the rate of scaffold biodegradation, transport of nutrients and growth factors, as well as removal of cell metabolic wastes at the site of injury are critical fluid-dynamics factors, affecting cell proliferation and ultimately tissue regeneration. Therefore, there is a critical need to identify the underlying material transport mechanisms and factors associated with cell-seeded, scaffold-based bone tissue engineering. The overarching goal of this study is to contribute to patient-specific, clinical treatment of bone pathology. The overall objective of the work is to establish computational fluid dynamics (CFD) models to identify: (i) the consequential mechanisms behind internal and external material transport through/over porous bone scaffolds and (ii) optimal triply periodic minimal surface (TPMS) scaffold designs toward cell-laden bone fracture treatment. In this study, 10 internal-flow and 10 external-flow CFD models were established using ANSYS, correspondingly based on 10 single-unit TPMS bone scaffold designs, where the geometry of each design was parametrically created using Rhinoceros 3D software. The influence of several design parameters, such as surface representation iteration, merged toggle iso value, and wall thickness, on geometry accuracy as well as computational time, was investigated in order to obtain computationally efficient and accurate CFD models. The fluid properties (such as density and dynamic viscosity) as well as the boundary conditions (such as no-slip condition, inlet flow velocity, and pressure outlet) of the CFD models were set based on clinical/research values reported in the literature as well as according to the fundamentals of internal/external Newtonian flow modeling. Several fluid characteristics, includi

关键词： Computational fluid dynamics

来源：评论

学校读者我要写书评

暂无评论

Texture development and surface reconstruction of BiVO_(4)photoanode via one-pot hydrothermal reaction for enhanced photoelectrochemical water splitting

引用

Journal of Advanced Ceramics 2025年第3期14卷 133-141页

作者： Sung Won Hwang Yoo Jae Jeong Runfa Tan Indhujasri Saravanan Hyun Soo Han Dong Hoe Kim In Sun Cho Department of Energy Systems Research Ajou UniversitySuwon 16499Republic of Korea Department of Material Science&Engineering Ajou UniversitySuwon 16499Republic of Korea Department of Mechanical Engineering Stanford UniversityStanford 94305USA Department of Material Science&Engineering Korea UniversitySeoul 02841Republic of Korea Materials Science and Engineering Program University of Colorado BoulderBoulder 80303USA

The simultaneous optimization of the bulk and surface characteristics of photoelectrodes is essential to maximize their photoelectrochemical(PEC)*** report a novel one-pot hydrothermal synthesis of textured and surface-reconstructed BiVO_(4)photoanodes(ts-BVO),achieving significant improvements in PEC water *** controlling precursor molarity and ethylene glycol(EG)addition,we developed a stepwise dual reaction(SDR)mechanism,which enables simultaneous bulk texture development and surface *** optimized CoBi/ts-BVO photoanode exhibited a photocurrent density of 4.3 mA∙cm^(−2)at 1.23 V *** hydrogen electrode(RHE)with a high Faradaic efficiency of 98%under one sun *** with nontextured BiVO_(4),the charge transport efficiency increased from 8%to 70%,whereas the surface charge transfer efficiency improved from 9%to 85%.These results underscore the critical role of both bulk and surface engineering in enhancing PEC *** findings offer a streamlined approach for improving the intrinsic properties of photoanodes in solar water splitting.

关键词： BiVO_(4) hydrothermal texture surface reconstruction ethylene glycol(EG) photoelectrochemical water splitting

来源：评论

学校读者我要写书评

暂无评论

engineering Nano/Microscale Chiral Self‑Assembly in 3D Printed Constructs

引用

Nano-Micro Letters 2024年第3期16卷 313-332页

作者： Mohsen Esmaeili Ehsan Akbari Kyle George Gelareh Rezvan Nader Taheri‑Qazvini Monirosadat Sadati Department of Chemical Engineering University of South CarolinaColumbiaSC 29208USA TA Instruments Waters LLCNew CastleDE 19720USA Biomedical Engineering Program University of South CarolinaColumbiaSC 29208USA

Helical hierarchy found in biomolecules like cellulose,chitin,and collagen underpins the remarkable mechanical strength and vibrant colors observed in living *** study advances the integration of helical/chiral assembly and 3D printing technology,providing precise spatial control over chiral nano/microstructures of rod-shaped colloidal nanoparticles in intricate *** designed reactive chiral inks based on cellulose nanocrystal(CNC)suspensions and acrylamide monomers,enabling the chiral assembly at nano/microscale,beyond the resolution seen in printed *** employed a range of complementary techniques including Orthogonal Superposition rheometry and in situ rheo-optic measurements under steady shear rate *** techniques help us to understand the nature of the nonlinear flow behavior of the chiral inks,and directly probe the flow-induced microstructural dynamics and phase transitions at constant shear rates,as well as their post-flow ***,we analyzed the photo-curing process to identify key parameters affecting gelation kinetics and structural integrity of the printed object within the supporting *** insights into the interplay between the chiral inks self-assembly dynamics,3D printing flow kinematics and photopolymerization kinetics provide a roadmap to direct the out-of-equilibrium arrangement of CNC particles in the 3D printed filaments,ranging from uniform nematic to 3D concentric chiral structures with controlled pitch length,as well as random orientation of chiral *** biomimetic approach can pave the way for the creation of materials with superior mechanical properties or programable photonic responses that arise from 3D nano/microstructure and can be translated into larger scale 3D printed designs.

关键词： Directed chiral self-assembly Cellulose nanocrystals Bioinspired nanocomposite 3D printing Rheology

来源：评论

学校读者我要写书评

暂无评论

Synthetic brochosomes:Design,synthesis,and applications

引用

Nano Research 2024年第2期17卷 734-742页

作者： Lin Wang Jinsol Choi Tak-Sing Wong Department of Mechanical Engineering The Pennsylvania State UniversityUniversity ParkPA 16802USA Materials Research Institute The Pennsylvania State UniversityUniversity ParkPA 16802USA Department of Biomedical Engineering The Pennsylvania State UniversityUniversity ParkPA 16802USA

Brochosomes,which are nanoscopic buckyball-shaped granules produced by leafhoppers,are one of the most intricate structures discovered in *** functions of brochosomes have been proposed but only a few have been experimentally validated due to the challenge of fabricating their synthetic *** in micro-and nanofabrication have recently led to the emergence of synthetic brochosomes,opening up new possibilities for innovative *** review explores the early discovery of natural brochosomes and their geometrical features,followed by the recent progress in fabricating synthetic brochosomes and their *** on future applications and challenges in the scalable manufacturing of synthetic brochosomes are discussed.

关键词： synthetic brochosomes leafhopper antireflection superhydrophobicity surface-enhanced Raman scattering photocatalyst energy harvesting

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：