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  • Open Access

    ARTICLE

    Influence of Confined Concrete Models on the Seismic Response of RC Frames

    Hüseyin Bilgin*, Bredli Plaku

    Structural Durability & Health Monitoring, Vol.18, No.3, pp. 197-222, 2024, DOI:10.32604/sdhm.2024.048645 - 15 May 2024

    Abstract In this study, the influence of confined concrete models on the response of reinforced concrete structures is investigated at member and global system levels. The commonly encountered concrete models such as Modified Kent-Park, Saatçioğlu-Razvi, and Mander are considered. Two moment-resisting frames designed according to the pre-modern code are taken into consideration to reflect the example of an RC moment-resisting frame in the current building stock. The building is in an earthquake-prone zone located on Z3 Soil Type. The inelastic response of the building frame is modelled by considering the plastic hinges formed on each beam… More >

  • Open Access

    ARTICLE

    Nonlinear Study on the Mechanical Performance of Built-Up Cold-Formed Steel Concrete-Filled Columns under Compression

    Oulfa Harrat1,*, Yazid Hadidane1, S. M. Anas2,*, Nadhim Hamah Sor3,4, Ahmed Farouk Deifalla5, Paul O. Awoyera6, Nadia Gouider1

    CMES-Computer Modeling in Engineering & Sciences, Vol.139, No.3, pp. 3435-3465, 2024, DOI:10.32604/cmes.2023.044950 - 11 March 2024

    Abstract Given their numerous functional and architectural benefits, such as improved bearing capacity and increased resistance to elastic instability modes, cold-formed steel (CFS) built-up sections have become increasingly developed and used in recent years, particularly in the construction industry. This paper presents an analytical and numerical study of assembled CFS two single channel-shaped columns with different slenderness and configurations (back-to-back, face-to-face, and box). These columns were joined by double-row rivets for the back-to-back and box configurations, whereas they were welded together for the face-to-face design. The built-up columns were filled with ordinary concrete of good strength.… More > Graphic Abstract

    Nonlinear Study on the Mechanical Performance of Built-Up Cold-Formed Steel Concrete-Filled Columns under Compression

  • Open Access

    PROCEEDINGS

    Ion dynamics and Manipulation Under Extreme Confinement

    Yahui Xue1,*

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.27, No.2, pp. 1-1, 2023, DOI:10.32604/icces.2023.09724

    Abstract Ion dynamics and precise control in nanochannels play key roles in biological systems, energy conversation, and environmental engineering. However, the mechanics behaviors of ions and their manipulation mechanism under extreme confinement remain largely unexplored. Biological ion channels acting as life’s transistors can gate simultaneously fast and selective ion transport through atomic-scale filters to maintain vital life functions. This biological inspiration motivates the quest for artificial structures with simultaneous functions of ion selectivity, fast transport and electrical gating at the atomic scale. Here, we experimentally investigate the ion dynamics and electrical manipulation in graphene channels of… More >

  • Open Access

    PROCEEDINGS

    Particle Dynamics in a Low-Reynolds-Number Fluid Under Spherical Confinement

    Gaofeng Chen1,2, Xikai Jiang1,2,*

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.25, No.2, pp. 1-1, 2023, DOI:10.32604/icces.2023.09877

    Abstract Dynamics of a single particle suspended in a low-Reynolds-number fluid under spherical confinement was studied numerically. We calculated hydrodynamic mobilities of a sphere, a prolate spheroid, and an oblate spheroid parallel and transverse to particle-cavity line of centres. The mobilities show maximum in the cavity centre and decay as the particle moves towards the no-slip wall. For prolate and oblate spheroids, their mobilities are also affected by the angle between particle's axis of revolution and the particle-cavity line of centres due to particle anisotropy. It was observed that the effect of particle anisotropy becomes stronger… More >

  • Open Access

    ARTICLE

    Tin Slag Polymer Concrete Strengthening by Basalt and Aramid Fiber Reinforced Polymer Confinement

    MUHAMAD SOFFI BIN MANDA1,2, MOHD RUZAIMI BIN MAT REJAB1, SHUKUR ABU HASSAN3,4, MAT UZIR BIN WAHIT3,4, JOSEPH SELVI BINOJ5,*, BRIGHT BRAILSON MANSINGH6, SITI SAFARAH BINTI AMIRNUDDIN3, ALAMRY ALI7, KHENG LIM GOH8,9, DIDIK NURHADIYANTO10

    Journal of Polymer Materials, Vol.39, No.3-4, pp. 241-253, 2022, DOI:10.32381/JPM.2022.39.3-4.5

    Abstract This study investigates the potential of Tin Slag Polymer Concrete (TSPC) strengthening through confinement using basalt fiber reinforced polymer (BFRP) and aramid fiber reinforced polymer (AFRP) confinement. TSPC short cylindrical column samples have been wrapped with BFRP and AFRP in a single layer (30 mm overlap) using Sikadur-330 epoxy and final samples were coded as TSPC-UC, TSPC-BF and TSPC-AF for unconfined, BFRP and AFRP for confined respectively. After curing for 30 days at room temperature, compressive test has been performed to know the strength, modulus, strain, fracture energy and failure modes of unconfined and confined… More >

  • Open Access

    ARTICLE

    Impact de la Covid-19 sur la fertilité et la sexualité durant le confinement : quelles pertes de chance ?*

    B. Ducrocq

    Psycho-Oncologie, Vol.16, No.3, pp. 313-317, 2022, DOI:10.3166/pson-2022-0209

    Abstract La pandémie de Covid-19 liée au virus SARSCoV-2 a imposé un confinement mondial des populations en mars 2020. Outre les effets sur la santé publique et la santé physique, la santé mentale et la santé sexuelle ont été impactées. Les projets personnels des individus ont été bouleversés avec un impact sur les projets de couple et notamment de parentalités. La sexualité des individus s’est adaptée, entraînant des changements importants liés à l’isolement et les incertitudes en lien avec la pandémie mondiale. More >

  • Open Access

    VIEWPOINT

    A Novel Biological Nano Confinement Inhibits Cancer Metastasis

    Sen Lu1,3, Zunqiang Zhao2,4, Zhongwei Lv2, Jianshe Yang2,3,*

    Oncologie, Vol.24, No.3, pp. 591-597, 2022, DOI:10.32604/oncologie.2022.025144 - 19 September 2022

    Abstract Cancer is a complex genetic disease hallmarked with a strong competitive capacity in energy and utilization of substances compared to normal cells, which is partially due to the ability to adjust their metabolism in response to environmental changes. During the lifespan of cancer cells, either during carcinogenesis, progress, or metastasis, massive energy and other substances are essential prerequisites, however, the underlying mechanisms are controversial and still remain unclear. Understanding how cancer cells seize much of the energy and other substances than normal cells is of utmost importance for next-generation cancer therapy, along with the finding… More >

  • Open Access

    ABSTRACT

    The Dendritic Cells’ Immunological Behaviors Modulated by the Spatial Confinements of Deposited Fibrin Matrix

    Wenhui Hu1, Yun Wang1, Jin Chen1, Yonggang Song1, Jinhua Long1, Zhu Zeng1,*

    Molecular & Cellular Biomechanics, Vol.16, Suppl.2, pp. 67-67, 2019, DOI:10.32604/mcb.2019.07083

    Abstract The responses of dendritic cells (DCs) to the mechanical microenvironment caused by implanted materials are highly correlated to the host immune responses and largely determines the outcome of tissue regeneration [1,2]. In the early stage of the inflammations following injury or implantation, a large amount of fibrin would deposit around the implanted materials and form a microporous fibrous-liked network structure, which can provide mechanical microenvironment with different spatial confinement in dimensions for following recruited DCs. Herein, we have established a useful model by salmon fibrin to mimic the deposited fibrin matrix and found that DCs More >

  • Open Access

    ABSTRACT

    SMA Confinement of HDPE Pipes: Enhancement of the Joint Fracture Resistance

    Eunsoo Choi1,*, Yunkyu Ha1, Duhyeon Kim1, Hoan D. Nguyen1, Tae Yeong Kim1, Seong Jun Park1, Yeon-seong Lee1, Cheolki Min2

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.1, pp. 13-13, 2019, DOI:10.32604/icces.2019.05356

    Abstract This study was to provide a new aspect of application of shape memory alloys (SMAs) in civil engineering. The high-density polyethylene (HDPE) have been used for construction of pipelines for several years. The main problem of using HDPE for pipes is the joint of two adjacent pipes. In case of having a perfect joint, the HDPE pipeline can bare the internal pressure up to 90 MPa. However, in practice, it can rarely achieve to a perfect pipe joint due to the complicated process, so, it prone to fracture in low internal pressure. To overcome this,… More >

  • Open Access

    ARTICLE

    Natural Rubber-Based Ionogels

    TK. N. Tran1,2, A. Guyomard-Lack3, C. Cerclier3, B. Humbert3, G. Colomines1, J-F. Pilard2, R. Deterre1, J. Le Bideau3,*, E. Leroy4,*

    Journal of Renewable Materials, Vol.6, No.3, pp. 251-258, 2018, DOI:10.7569/JRM.2017.634174

    Abstract Natural rubber (NR), besides being an abundant renewable resource for the elastomer industry, can be a potential resource for the design of innovative biobased polymer networks. The present work is based on "telechelic" liquid natural rubber oligomers obtained by controlled chemical degradation of NR. The chain ends of such oligomers can then be functionalized (with acrylate functions in the present case) and reacted with multifunctional crosslinkers in order to form networks. What's more, the initial solubility of such thermosetting system in an ionic liquid (IL) can be used for the formulation of ionogels. Such solid More >

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