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  • Open Access

    ARTICLE

    Analysis of the Movement Track of Top Spinning Ball and Biomechanics in the Process of Hitting Tennis Ball

    Xia Xie*

    Molecular & Cellular Biomechanics, Vol.18, No.3, pp. 147-156, 2021, DOI:10.32604/mcb.2021.016246

    Abstract The aim of this study is to analyze the movement track of top spinning tennis ball and the biomechanics characteristics of tennis players. This study took ten tennis players as an example. The hitting process of the top spinning ball was captured by two PULNIX high-speed cameras. The images were processed by APAS motion analysis system. The results showed that the top spinning ball moved forward while rotating in the hitting process and showed a large attack force after rebounding from the land. In biomechanics, A and B had larger angles of upper limb joints and larger joint speed. The… More >

  • Open Access

    REVIEW

    Microfluidic chips for the endothelial biomechanics and mechanobiology of the vascular system

    HAORAN SU1, KEXIN LI1, XIAO LIU1,*, JING DU1, LI WANG4, XIAOYAN DENG3,*, YUBO FAN1,2,*

    BIOCELL, Vol.45, No.4, pp. 797-811, 2021, DOI:10.32604/biocell.2021.014900

    Abstract Endothelial cells arranged on the vessel lumen are constantly stimulated by blood flow, blood pressure and pressureinduced cyclic stretch. These stimuli are sensed through mechanical sensory structures and converted into a series of functional responses through mechanotransduction pathways. The process will eventually affect vascular health. Therefore, there has been an urgent need to establish in vitro endothelial biomechanics and mechanobiology of models, which reproduce three-dimensional structure vascular system. In recent years, the rapid development in microfluidic technology makes it possible to replicate the key structural and functionally biomechanical characteristics of vessels. Here, we summarized the progress of microfluidic chips used… More >

  • Open Access

    ARTICLE

    Micro Hierarchical Structure and Mechanical Property of Sparrow Hawk (Accipiter nisus) Feather Shaf

    Yichen Lu1, Zongning Chen1, Enyu Guo1,*, Xiangqing Kong2, Huijun Kang1, Yanjin Xu3, Rengeng Li4, Guohua Fan4, Tongmin Wang1,*

    CMES-Computer Modeling in Engineering & Sciences, Vol.127, No.2, pp. 705-720, 2021, DOI:10.32604/cmes.2021.015426

    Abstract In this study, the real 3D model of the feather shaft that is composed of medulla and cortex is characterized by X-ray computer tomography, and the structural features are quantitatively analyzed. Compression and tensile tests are conducted to evaluate the mechanical performance of the feather shaft and cortex at different regions. The analysis of the 3D model shows that the medulla accounts for ∼70% of the shaft volume and exhibits a closed-cell foam-like structure, with a porosity of 59%. The cells in the medulla show dodecahedron and decahedron morphology and have an equivalent diameter of ∼30 μm. In axial compression,… More >

  • Open Access

    ARTICLE

    Motion Features of Legs in Volleyball Block Jump Based on Biomechanical Analysis

    Zilin Li, Junjiang Wang, Yan Yang*

    Molecular & Cellular Biomechanics, Vol.18, No.2, pp. 87-97, 2021, DOI:10.32604/mcb.2021.014731

    Abstract Blocking technology is one of the most important means to obtain score in volleyball, which has a great influence on the victory of the game. In this study, the vertical jump was analyzed to understand the movement characteristics of legs during training time. The kinematics and dynamics data of the legs of 10 volleyball players after training for 0 h, 0.5 h, 1 h and 2 h were studied by using an infrared light point motion capture system and force measuring platform. The results showed that the joint angles of the players who had 1 h and 2 h of… More >

  • Open Access

    ARTICLE

    Biomechanical Properties of Multi-Swing and Single-Swing Rope Skipping Actions

    Yiran Tian*

    Molecular & Cellular Biomechanics, Vol.18, No.1, pp. 41-49, 2021, DOI:10.32604/mcb.2021.014394

    Abstract Rope skipping is popular as it is easy to learn; thus, it has developed into a competitive sport. The research on the biomechanical properties of rope skipping can effectively improve training efficiency and reduce injury probability. This paper briefly introduced the characteristics of single-swing and multi-swing techniques in competitive rope skipping, selected ten second-grade athletes as the subjects to test the single-swing and triple-swing rope skipping, and tested the biomechanical properties in the process of rope skipping. The results showed that the variation range of the lower limb joint angle in the triple-swing rope skipping was larger than that in… More >

  • Open Access

    ARTICLE

    A Study on the Finite Element Model for Head Injury in Facial Collision Accident

    Bin Yang1,2,3,*, Hao Sun1, Aiyuan Wang1, Qun Wang2

    Molecular & Cellular Biomechanics, Vol.17, No.1, pp. 49-62, 2020, DOI:10.32604/mcb.2019.07534

    Abstract In order to predict and evaluate injury mechanism and biomechanical response of the facial impact on head injury in a crash accident. With the combined modern medical imaging technologies, namely computed tomography (CT) and magnetic resonance imaging (MRI), both geometric and finite element (FE) models for human head-neck with detailed cranio-facial structure were developed. The cadaveric head impact tests were conducted to validate the headneck finite element model. The intracranial pressure, skull dynamic response and skull-brain relative displacement of the whole head-neck model were compared with experimental data. Nine typical cases of facial traffic accidents were simulated, with the individual… More >

  • Open Access

    ARTICLE

    Leaf angle and light interception in sunflower (Helianthus annuus L.). Role of the petiole’s mechanical and anatomical properties

    Hernández LF

    Phyton-International Journal of Experimental Botany, Vol.79, pp. 109-115, 2010, DOI:10.32604/phyton.2010.79.109

    Abstract The relationships between (1) leaf biomass and morphology (lamina area and petiole and lamina inclination), (2) petiole’s mechanical and structural properties, and (3) the vertical light gradient inside the crop’s canopy were studied in field grown sunflower (Helianthus annuus L.) plants, maintained at optimum soil water and mineral levels. At flowering, incident photosynthetic active radiation (PAR) was measured at the top of the canopy and on individual leaves using a quantum sensor. The fraction of direct incident radiation which passed through the canopy reaching each individual leaf was then calculated. Individual petiole and lamina inclination angles (iaPetiole and iaLamin, respectively)… More >

  • Open Access

    ABSTRACT

    Assessment of the Locomotion and the Long-term Efficacy of Biomechanics Foot Orthotic for the Subjects with Adolescent Idiopathic Scoliosis

    Chien-Chi Liu1, Sai-Wei Yang1,*, Tsui-Fen Yang2

    Molecular & Cellular Biomechanics, Vol.16, Suppl.2, pp. 120-122, 2019, DOI:10.32604/mcb.2019.07150

    Abstract Scoliosis is the most common type of spinal deformity of the young adults, and women outnumber men about 10:1 [1], in which the Adolescent Idiopathic Scoliosis (AIS) is up to 90% for ages 10 to 16year-old teenagers [2]. Studies revealed that due to the 3-dimensional musculoskeletal deformities, the AIS subjects to the dynamic postural instability including vestibular and proprioception disorders [3-5]. Dynamic postural Balance is monitored by integration of cortical modulation and somatosensory response [6], and the either motor or sensory impairment lead to balance dysfunction as well as pathologic gait. Studies revealed that the biomechanics functional foot orthotics can… More >

  • Open Access

    ABSTRACT

    Identification of Btg2 As A Mechanosensitive Gene by Functional Screening Integrative Analyses

    Yao Guo1, Yijiang Song2, Yu Zhang1, Li Yang1,*

    Molecular & Cellular Biomechanics, Vol.16, Suppl.2, pp. 119-119, 2019, DOI:10.32604/mcb.2019.07134

    Abstract Osteoarthritis (OA), with its high disability and mortality rate, is the most common arthritis throughout the world [1]. Exposure of articular cartilage to excessive mechanical stress is deeply involved in the pathogenesis of osteoarthritis (OA) [2,3]. However, the mechanism of how mechanical stress causes cartilage degradation is not clear yet. Here we report that bioinformatics-based integrative analyses can assist in the study of mechanisms modulated by mechanical stress within OA pathology, and we reveal that B-cell Translocation Gene 2 (BTG2) can be a mechanosensitive gene involved in OA development. We obtained OA-associated differentially expressed genes from human and rat datasets… More >

  • Open Access

    ABSTRACT

    Finite Element Modelling Predicts Large Accommodation Induced Optic Nerve Head Deformations

    Xiaofei Wang1,2,*, Yubo Fan1,2

    Molecular & Cellular Biomechanics, Vol.16, Suppl.2, pp. 112-112, 2019, DOI:10.32604/mcb.2019.07053

    Abstract Accommodation is the ability of the eye to adjust its lens thickness to alter the refractive power through the contraction of ciliary muscles. The loss of accommodation ability due to aging leads to presbyopia, a condition in which the eye is unable to focus on near objects. Glaucoma is a disease that vision is impaired due to damage of the retinal ganglion cell at the optic nerve head (ONH) region, which is the leading cause of irreversible blindness worldwide. The biomechanical theory of glaucoma suggests that the deformations of ONH tissues could (directly or indirectly) drive retinal ganglion cell death.… More >

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