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Modeling limit force capacities of high force to volume lead extrusion dampers

Frontiers of Structural and Civil Engineering 2021年第3期15卷 609-622页

作者： V.VISHNUPRIYA geoffrey.w.rodgers J.geoffrey CHASE Department of Mechanical Engineering University of CanterburyChristchurch8140New Zealand QuakeCoRE NZ Centre for Earthquake Resilience Christchurch8041New Zealand

Lead extrusion dampers are supplemental energy-dissipation devices that are used to mitigate seismic structural *** volumetric sizes and high force capacities define high-force-to-volume(HF2V)devices,which can absorb significant response energy without sacrificial ***,the design of such devices for specific force capacities has proven difficult based on the complexities of their internal reaction mechanisms,leading to the adoption of empirical *** study developed upper-and lower-bound force capacity estimates from analytical mechanics based on direct and indirect metal extrusion for guiding *** derived equations are strictly functions of HF2V device geometric parameters,lead material properties,and extrusion *** upper-bound estimates from direct and indirect extrusion are denoted as(F_(UB,1),F_(UB,2))and(F_(UB,3),F_(UB,4)),respectively,and the lower-bound estimates are denoted as(F_(LB),F_(LB,1))based on the combination of extrusion and friction *** proposed models were validated by comparing the predicted bounds to experimental force capacity data from 15 experimental HF2V device *** experimental device forces all lie above the lower-bound estimates(F_(LB),F_(LB,1))and below the upper-bound estimates(F_(UB,1),F_(UB,2),F_(UB,4)).Overall,the(F_(LB),F_(UB,2))pair provides wider bounds and the(F_(LB,1),F_(UB,4)/F_(UB,1))pair provides narrower ***(F_(LB,1),F_(UB,1))pair has a mean lower-bound gap of 36%,meaning the lower bound was 74%of the actual device force on *** mean upper-bound gap was 33%.The bulge area and cylinder diameter of HF2V devices are key parameters affecting device *** relatively tight bounds provide useful mechanics-based predictive design guides for ensuring that device forces are within the targeted design range after manufacturing.

关键词： extrusion lead dampers upper and lower bound analytical modelling limit force

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混凝土自复位墙结构地震全过程损伤分析

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建筑结构学报 2024年第2期45卷 189-204页

作者：鲁懿虬 HENRY Richard S 周颖 rodgers geoffrey w 杨群顾安琪同济大学土木工程学院上海200092 奥克兰大学土木与环境系新西兰奥克兰1010 坎特伯雷大学土木与自然资源工程系新西兰基督城8140

后张法预应力混凝土自复位墙是一种有效的可恢复功能结构。虽然自复位墙自身在地震中损伤较小,但其与周边构件的变形不协调可使结构损伤严重。为控制结构层面的损伤,设计了1个框架-自复位墙结构,对自复位墙底、梁柱节点、墙梁节点、墙-... 详细信息

后张法预应力混凝土自复位墙是一种有效的可恢复功能结构。虽然自复位墙自身在地震中损伤较小,但其与周边构件的变形不协调可使结构损伤严重。为控制结构层面的损伤,设计了1个框架-自复位墙结构,对自复位墙底、梁柱节点、墙梁节点、墙-基础连接、柱-基础连接以及墙-板连接开展损伤控制设计,并对设计的结构进行足尺振动台试验。结构共经历了39次不同设计工况下不同烈度的地震激励,峰值加速度最大达1.0g,位移角最大达3.3%。对结构在历次地震作用下整体、局部构件和节点的损伤发展进行全过程定量分析,结果表明:自复位墙-开槽梁结构在地震作用下的损伤能够得到有效控制,其中多遇、设防地震作用下结构基本无损伤,罕遇地震作用下墙底损伤仅限角部剥落且面积仅为400 cm2,楼板有开裂且裂缝最大仅为1.2 mm,梁端剥落可忽略;自复位墙-开槽梁结构可使整个结构在不同设计位移角下实现多遇、设防地震不坏,罕遇地震小修甚至不修的抗震性能目标;设计的连接方式解决了结构中构件之间的变形不协调问题,提高了自复位墙结构层面的可修复性。

关键词：自复位墙开槽梁墙板连接振动台试验结构损伤

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Interfacial Phenomena in Solvent Extraction and Its Influence on Process Performance

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Tsinghua Science and Technology 2006年第2期11卷 165-170页

作者： geoffrey w. Stevens Particulate Fluids Processing Centre Department of Chemical and Biomolecular Engineering The University of Melbourne Victoria 3010 Australia

Solvent extraction is now finding applications in a broader range of fields than the past. Many of these applications require process equipment with shorter contact times, and in some cases to the point where the traditional equilibrium stage approach is not a good model for predicting performance. In addition, feed streams are becoming lower in concentration of the solute. This means greater feed to solvent flow ratios are being used and so loss of organics as entrainment in the feed is more of a concern both economically and environmentally. These trends mean that a greater emphasis is being placed on the kinetics of extraction and stripping in models to predict performance and on formation and coalescence of drops to control entrainment. This paper reviews recent advances in the tools for investigating kinetics and coalescence in solvent extraction processes and some of the insights that are being uncovered in these fundamental processes in solvent extraction technology.

关键词： solvent extraction drop coalescence liquid interface kinetics

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A novel method for clustering cellular data to improve classification

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Neural Regeneration Research 2025年第9期20卷 2697-2705页

作者： Diek w.wheeler Giorgio A.Ascoli Center for Neural Informatics Structures&PlasticityKrasnow Institute for Advanced Study Bioengineering Department Volgenau School of Engineering George Mason University FairfaxVAUSA

Many fields,such as neuroscience,are experiencing the vast prolife ration of cellular data,underscoring the need fo r organizing and interpreting large datasets.A popular approach partitions data into manageable subsets via hierarchical clustering,but objective methods to determine the appropriate classification granularity are *** recently introduced a technique to systematically identify when to stop subdividing clusters based on the fundamental principle that cells must differ more between than within *** we present the corresponding protocol to classify cellular datasets by combining datadriven unsupervised hierarchical clustering with statistical *** general-purpose functions are applicable to any cellular dataset that can be organized as two-dimensional matrices of numerical values,including molecula r,physiological,and anatomical *** demonstrate the protocol using cellular data from the Janelia MouseLight project to chara cterize morphological aspects of neurons.

关键词： cellular data clustering dendrogram data classification Levene's one-tailed statistical test unsupervised hierarchical clustering

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Climate change and invasive species:double jeopardy

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Integrative Zoology 2010年第2期5卷 102-111页

作者： Susan A.MAINKA geoffrey w.HOwARD Science and Learning Unit International Union for Conservation of NatureGlandSwitzerland Regional Office for Eastern and Southern Africa International Union for Conservation of NatureNairobiKenya

Two of the key drivers of biodiversity loss today are climate change and invasive *** change is already having a measurable impact on species distributions,reproduction and behavior,and all evidence suggests that things will get worse even if we act tomorrow to mitigate any future increases in greenhouse gas emissions:temperature will increase,precipitation will change,sea level will rise and ocean chemistry will *** the same time,biological invasions remain an important threat to biodiversity,causing species loss,changes in distribution and habitat *** together,the impacts of each of these drivers of change are compounded and interactions between these two threats present even greater challenges to field conservationists as well as ***,the social and economic impacts of climate change and invasive species,already substantial,will be *** of the links between the two should underpin all biodiversity management planning and policy.

关键词： climate change ecosystem management invasive species

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Genistein:a possible solution for the treatment of Alzheimer’s disease

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Neural Regeneration Research 2025年第10期20卷 2903-2905页

作者： Karolina Pierzynowska Bartosz Karaszewski Grzegorz węgrzyn Department of Molecular Biology University of GdanskGdanskPoland Gdansk Polandand Department of Adult NeurologyFaculty of MedicineMedical University of GdanskGdanskPoland

Neurodegenerative diseases are defined as disorders resulting from the slow and progressive loss of function and eventual death of neural cells that result from the primary pathology of nervous *** can lead to severe nervous system dysfunction,eventually affecting multiple organs and *** hundred neurodegenerative diseases have been described,and owing to their prevalence,severity.

关键词： organs Alzheimer death

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大型装配式自复位剪力墙结构振动台试验研究

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土木工程学报 2020年第10期53卷 62-71页

作者：周颖顾安琪鲁懿虬宋戈 Richard Henry geoffrey rodgers 同济大学土木工程防灾国家重点实验室上海200092 奥克兰大学奥克兰1010新西兰坎特伯雷大学基督城8140新西兰

为研究装配式自复位剪力墙结构在地震作用下的低损伤特性以及新型节点连接形式的有效性,同济大学ILEE联合实验室与新西兰QuakeCoRE研究中心联合开展了大型装配式自复位剪力墙结构振动台试验研究。试验对象为二层足尺装配式结构,结构体... 详细信息

为研究装配式自复位剪力墙结构在地震作用下的低损伤特性以及新型节点连接形式的有效性,同济大学ILEE联合实验室与新西兰QuakeCoRE研究中心联合开展了大型装配式自复位剪力墙结构振动台试验研究。试验对象为二层足尺装配式结构,结构体系主要由承受重力荷载的外围框架和承担水平荷载的自复位剪力墙构成。框架柱为重力柱,梁柱节点为开槽梁节点,可减少梁伸长效应带来的楼板损伤;自复位剪力墙与楼板的连接,长边方向为柔性连接、短边方向为隔离式连接;一层楼板采用双T板,二层楼板采用压型钢板组合楼板;节点连接处设有钢、铅、黏滞等三类阻尼器。在振动台试验中考虑了不同地震水准、地震动输入、结构设计等对结构动力响应的影响。试验结果表明,该结构在1g地震动输入下仍具有低损伤、自复位特性,试验间多次更换阻尼器,成功实现了关键部件的可更换性。

关键词：自复位剪力墙结构装配式振动台试验低损伤可更换

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The use of environmentally sustainable bio-derived solvents in solvent extraction applications——A review

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Chinese Journal of Chemical Engineering 2016年第2期24卷 215-220页

作者： Zheng Li Kathryn H.Smith geoffrey w.Stevens Particulate Fluids Processing Centre Department of Chemical and Biomolecular EngineeringThe University of Melbourne

Replacement of volatile organic compounds （VOCs） by greener or more environmentally sustainable solvents is becoming increasingly important due to the increasing health and environmental concerns as well as economic pressures associated with VOCs. Solvents that are derived from biomass, namely bio-derived solvents, are a type of green solvent that have attracted intensive investigations in recent years because of their advantages over con- ventional VOCs, such as low toxicity, biodegradability and renewability. This review aims to summarize the use of bio-derived solvents in solvent extraction applications, with special emphasis given to utilization of biodiesels and terpenes. Compared with the conventional VOCs, the overall performance of these bio-derived solvents is comparable in terms of extraction yields and selectivity for natural product extraction and no difference was found for metal extraction. To date most researchers have focused on laboratory scale thermodynamics studies. Future work is required to develop and test new bio-derived solvents and understand the kinetic performance as well as solvent extraction nilnt nlant studies.

关键词： Solvent extraction Bio-derived solvents Green solvents Biodiesels Terpenes

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Glia-to-neuron reprogramming to the rescue?

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Neural Regeneration Research 2025年第5期20卷 1395-1396页

作者： Jack w.Hickmott Cindi M.Morshead Department of Surgery University of TorontoTorontoONCanada Donnelly Centre for Cellular and Biomolecular Research TorontoONCanada Institute of Biomedical Engineering University of TorontoTorontoONCanada The KITE Research Institute Toronto Rehabilitation InstituteUniversity Health NetworkTorontoONCanada

Over the last two decades,the dogma that cell fate is immutable has been increasingly challenged,with important implications for regenerative *** brea kth rough discovery that induced pluripotent stem cells could be generated from adult mouse fibroblasts is powerful proof that cell fate can be *** exciting extension of the discovery of cell fate impermanence is the direct cellular reprogram ming hypothesis-that terminally differentiated cells can be reprogrammed into other adult cell fates without first passing through a stem cell state.

关键词： programming passing proof

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Dynamic modeling of a three-dimensional braided composite thin plate considering braiding directions

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Applied Mathematics and Mechanics(English Edition) 2025年第1期46卷 123-138页

作者： Chentong GAO Huiyu SUN Jianping GU w.M.HUANG College of Aerospace Engineering Nanjing University of Aeronautics and Astronautics School of Mechanical and Aerospace Engineering Nanyang Technological University Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology School of Materials Science and EngineeringNanjing Institute of Technology

Currently, there are a limited number of dynamic models available for braided composite plates with large overall motions, despite the incorporation of three-dimensional(3D) braided composites into rotating blade components. In this paper, a dynamic model of 3D 4-directional braided composite thin plates considering braiding directions is established. Based on Kirchhoff's plate assumptions, the displacement variables of the plate are expressed. By incorporating the braiding directions into the constitutive equation of the braided composites, the dynamic model of the plate considering braiding directions is obtained. The effects of the speeds, braiding directions, and braided angles on the responses of the plate with fixed-axis rotation and translational motion, respectively, are investigated. This paper presents a dynamic theory for calculating the deformation of 3D braided composite structures undergoing both translational and rotational motions. It also provides a simulation method for investigating the dynamic behavior of non-isotropic material plates in various applications.

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