金戈铁马 烽火硝烟——历史节点上的山海关之战

在山海关石河东岸、角山南麓，有一个美丽的村庄，名叫回马寨，传说村庄得名与明朝末年农民起义军领袖李白成及发生在这里的石河大战有关。     

毛泽东“停、缩、发”讲话历史真相探源

在我国农业合作化运动中,毛泽东著名的"停、缩、发"讲话现在有两个文本,一个是1955年3月,一个是1955年5月。通过对不同文本的史料真实性、佐证性和连续性进行认真梳理,发现毛泽东1955年3月"停、缩、发"讲话或三字方针在历史档案、当年讲话和相关文件中均无任何记载,存在若干疑点。     

让民族精神在青少年心中扎根

青少年是祖国的未来,是民族振兴的希望。在青少年学生中大力弘扬和培育民族精神,是学校德育工作的一个重要方面。当前,我国的教育正处在改革攻坚阶段和发展关键时期,对外开放进一步扩大,为广大青少年了解世界、增长见识、开阔视野提供了更加便利的条件;与此同时,多元化的价值取向给传统的教育造成了强大冲击,市场经济利益至上的原则、     

Fast Nonlinear Analysis of Traditional Chinese Timber-Frame Building with Dou-Gon

ABSTRACT

This article presents a study of the applicability of fast nonlinear analytical (FNA) models in predicting the global response of Chinese traditional timber-frame building with Dou-Gon under seismic excitation. Efforts are made to overcome challenges in establishing simplified calculation models, and the corresponding dynamic equations are derived considering the mechanical behavior of sliding column root, mortise-tenon joint and Dou-Gon (bracket sets). Furthermore, nonlinear time-history analysis is conducted under different seismic excitations. Through a verification study, a good correspondence is obtained with previous shake-table test results. Seismic response analysis is also conducted to investigate the energy dissipation of column root sliding, mortise-tenon joint, and Dou-Gon. Subsequently, peak responses of column root and roof under increased values of peak ground acceleration (PGA) are also analyzed. And then, seismic isolation ability and damping characteristics of the model are discussed.     

早期鄂豫陕间文化交流通道的初步研究

今鄂豫陕三省的交界地带,特别是以南阳盆地为中心的地区,是早期中原、荆楚、关中各大区域之间往来的交通要道,这些通道实际上就是各区域之间文化交流的地理舞台,更是三代国家实现区域联合不可缺少的信息传输纽带。