Development of Neural Network Based Hysteretic Models for Steel Beam-Column Connections Through Self-Learning Simulation

Beam-column connections are zones of highly complex actions and deformations interaction that often lead to failure under the effect of earthquake ground motion. Modeling of the beam-column connections is important both in understanding the behavior and in design. In this article, a framework for developing a neural network (NN) based steel beam-column connection model through structural testing is proposed. Neural network based inelastic hysteretic model for beam-column connections is combined with a new component based model under self-learning simulation framework. Self-learning simulation has the unique advantage in that it can use structural response to extract material models. Self-learning simulation is based on auto-progressive algorithm that employs the principles of equilibrium and compatibility, and the self-organizing nature of artificial neural network material models. The component based model is an assemblage of rigid body elements and spring elements which represent smeared constitutive behaviors of components; either nonlinear elastic or nonlinear inelastic behavior of components. The component based model is verified by a 3-D finite element analysis. The proposed methodology is illustrated through a self-learning simulation for a welded steel beam-column connection. In addition to presenting the first application of self-learning simulation to steel beam-column connections, a framework is outlined for applying the proposed methodology to other types of connections.     

跨学科视域下的博物馆非遗类展陈——以“云泽芳韵土布展”为例

非物质文化遗产保护是新时代博物馆功能的又一重要体现。如何做好非遗事项的展陈,如何通过有形、静态的"物品"呈现非遗无形、活态的"信息",这是博物馆学与民俗学、社会学、人类学等学科综合研究的要求与趋势。"云泽芳韵土布展"通过两位女性非遗传承人的手工织布作品来讲述其个人生命故事,更好地呈现"物"与"人"的关联,使观众于观展过程中,不仅能了解非遗技艺,提升非遗保护意识,更能通过对他人生命故事的解读,完成自我生命的观照与思考。此案例可以为更多的博物馆非遗类展陈提供参考。     

New occurrence of Cambroclavus absonus from the lowermost Cambrian of North China and its stratigraphical importance

Li, L.-Y., Zhang, X.-L., Yun, H. & Li, G.-X., October 2015. New occurrence of Cambroclavus absonus from the lowermost Cambrian of North China and its stratigraphical importance. Alcheringa 40, xxx–xxx. ISSN 0311-5518.

The problematic Small Shelly Fossil Cambroclavus absonus is described from the Xinji Formation in the Longxian area, which is located near the southwestern margin of the North China Platform. The Xinji Formation, the basal rock unit of the Cambrian in the studied area, yields an assemblage of skeletal fossils that share many common elements with contemporary faunas from South Australia. Sclerites of C. absonus reported herein represent the first occurrence of the species outside Australia, thus extending the palaeogeographic range of the taxon to northern China. To date, palaeogeographic occurrences of Cambroclavus sclerites are restricted to the Peri-Gondwana realm, including South China, Australia, Tarim, Kazakhstan, North China and Western Europe. These occurrences are divided into a Southern Group realm and Northern Group realm. Stratigraphically, Cambroclavus occurs mostly in Cambrian Stage 3 and has three occurrences in Stage 5, separated by Stage 4 in which Cambroclavus has not yet been found. The first appearance datum of Cambroclavus in Cambrian Stage 3 is of importance for regional and inter-regional correlations. In particular, the presence of Cambroclavus absonus in North China allows species-level correlation between North China and South Australia.

Luoyang Li [lly@stumail.nwu.edu.cn], Xingliang Zhang [xzhang69@nwu.edu.cn], Hao Yun [yunhao@stumail.nwu.edu.cn], Early Life Institute and State Key Laboratory Of Continental Dynamics, Department of Geology, Northwest University, Xian 710069, PR China; Guoxiang Li [gxli@nigpas.ac.cn], Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, PR China.     

纳税单位“真实”的一面——以徽州府土地数据考释为中心

本文拟以土地数据考释为中心，把有关徽州地区历史赋税资料与现代统计资料数据结合起来进行研究，从而就载籍时间断面数据的考查、纳税单位与耕地数据的区分、耕地面积“峰值期”的确定等几方面来探讨徽州特定时期的纳税单位能够反映“真实”的耕地面积，并以此为基点对嘉道时期的耕地面积进行再估计。     

侯马东周祭祀遗址出土玉器材质的矿物学测试及产源分析

山西侯马西高及晋田热力公司东周祭祀遗址4件出土玉器残片样品经过比重测试、红外光谱物相分析、X射线粉晶衍射分析、显微结构观察及稳定同位素等矿物学测试和产源分析,发现其中的西高(J580、J332)和热力公司(JK728)3件样品是来自新疆和田地区的闪玉石,热力公司(JK659)样品是蛇纹石化大理岩。     

十二生肖玉朔源与演变

十二生肖作为一种古老的民俗文化事象,有着渊源的历史。关于它的起源,历代学者众说纷纭。《辞海》中十二生肖的解释是这样论述的：“古时的术数家拿十二种动物来配十二地支,子为鼠,丑为牛,寅为虎,卯为兔,辰为龙,巳为蛇,午为马,未为羊,申为猴,酉为鸡,戌为狗,亥为猪。”赵翼《陔馀丛考》谓十二生肖之说起于东汉,汉以前没有言者,到了东汉,     

城市在促进东北民族融合中的作用

少数民族城市化是指少数民族从传统的乡村社会转化为城市社会的过程,也是城市与乡村在经济、社会和文化等方面相互交融互动、全面整合和共同发展的过程。历史上东北地区城市是区域经济文化联系的“点“和“线“的结合处,是中原汉族文化在少数民族地区传播的中心点。城市空间布局与城市文化进程是影响民族关系的重要途径,对形成和巩固区域民族共同体发挥着巨大作用,同时又促进了中华各民族的交流、融合,成为民族融合的中心。     

骑白马的父亲

骑白马的父亲从我的视线中消失了,走向了他想去的地方。雪花飘落,使我内心掩埋依旧的痛苦在落雪的日子,与悄然而落的泪滴相融,随风飘向了父亲远去的地方。在他的身后那一行行的足迹中,我看见了父亲蹒跚的身影在走过时,留下的艰辛与坎坷……     

论以色列农业的可持续发展态势

以色列农业是在困难的生产环境中发展起来的现代化农业,它具有外向型结构,以灌溉和生物技术为中心的先进技术,产-供-销-服务一体化的产业结构。以色列农业的成功经验,特别是其中的可持续发展因素,对世界农业,特别是对土地资源、水资源条件均不理想的干旱、半干旱地区具有很强的现实意义和启示作用。本文重点论述了上述内容及以色列农业的可持续发展特征,并指出了以色列农业在可持续发展中应当注意的问题。     

一部颇具新意的拓荒之作——评《当代中国政治思想史》

河南大学出版社新近出版的《当代中国政治思想史》一书 ,不论在学术价值、理论建树方面 ,还是在推动学科建设、为现实提供借鉴方面 ,都不失为一部创见迭出、极富新意的开拓性佳作。该书也有某些不足之处