The generalized variational data assimilation for non-differential dynamical systems is studied.There is no tangent linear model for non-differential systems an
Due to the mismatch in the coefficients of thermal expansion of slicon chip and the surrounding plastic encapsulation materials, the induced thermal stress is t
The mechanical behavior of rock under uniaxial tensile loading is different from that of rock under compressive loads. A micromechanics-based model was proposed
The methods of multiple scales and approximate potential are used to study pendulums with linear damping and variable length. According to the order of the coef
温度的检查：一般采用“定期、定层、定点、定时”四定的检查方法。定期，按种子情况、不同季节和规定期限进行检查。定层，仓内散装种子应按种子堆上、中、下三层检查，上层离堆表面
A new discrete approximation to the convection term of the covection-diffusionequation was constructed in Saul' yev type difference scheme, then the alterna
<正> 一、谁是《女神》的最早评论者郭沫若的《女神》是我国新诗的奠基之作。对于这部“开一代诗风”的诗集,几十年来,不少诗人、评论家、现代文学史的研究者,写了数量众多的评论文章。但谁是最早向读者推荐这本诗集的“伯乐”呢?这倒是一个值得查考的问题了。有人曾把闻一多当作最早评论《女神》的人,我认为这失于审察。从查考资料来看,最早称道《女神》中单篇作品的是宗白华。五四运动期间,宗白华担任上海《时事新报》副刊《学灯》的主编,郭沫若经常给《学灯》写诗,宗白华激赏郭沫若抒情的天才,大量发表他的作品,促成他
本刊讯＂今年1500亩线椒预计创收1200万元,从种到收需要5个月,每天需要雇用300多名临时工,每人月工资2000元,每个工人预计能收入1万元。＂日前,记者在河南省获嘉县采访时,大新庄
By the degree theory on positive cone together with the technique of a priori estimate, the nontrivial equilibrium solutions of a strong nonlinearity and weak c
A brief survey of fractional calculus and fractional differential forms was firstly given. The fractional exterior transition to curvilinear coordinate at the o