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。     

家有小雀儿

去年孟夏时节,我在高庙老家的屋院里见到了一种小雀儿,称其为小雀儿,是因为其个儿比麻雀小。那是一个风和日丽的上午,我和母亲坐在北屋的廊檐下聊天。只听得扑楞一声,一只小雀儿飞落到院子里。突然见到久违了的雀儿,我喜出望外兴奋不已,赶紧轻轻地对母亲说“:妈,快看,雀儿来家里了!”“两只雀儿这阵子老来,今儿不知咋只来了一     

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。