In this paper a submerged horseshoe vortex under a free surface is discussed and the algebraic expression of the wave elevation is obtained. From this expressio
芥菜型油菜Moricandia arvensis细胞质雄性不育（Mor CMS）材料是Prakash院士将Moricandia arvensis(MM，2n=28)与Brassic juncea(AABB，2n=36)进行体细胞融合(2n=64，MMAABB)后，再用芥
南海北部近岸海域的风暴潮爆发频率高、危害大,其中广东近岸海域每年由于台风遭受的经济损失高居全国之首,因此更好地评估和预测南海近岸对台风的响应过程有着重要意义.本文
The steady-state properties of a bistable system are investigated when both the multiplicative noise and the coupling between additive and multiplicative noises
在华中地区双季稻双直播模式中,直播早稻播种后易遭受低温胁迫而导致种子发芽、出苗率低,出苗困难的问题严重限制了该模式的进一步推广。种子处理技术是指在播种前采用物理或化学方法处理种子,从而提高种子萌发性能和抗逆性的一种技术。评价和筛选不同种子处理技术在直播早稻中的应用效果,并探索其调控机理,对于保障直播早稻的“一播全苗”具有重要的现实意义。本研究考察了两种引发处理、两种包衣处理和四种包衣+引发处理组合
今年,美国纽约《华尔街日报》职工热烈庆祝该报创刊百周年。该报是美国第一家办得成功的全国性专业报纸。 1870年,记者查尔斯·道和爱德华·琼斯在纽约合伙开办道·琼斯公司
In this paper,the definition of three-order form invariance is given.Then the relation between the three-order form invariance and the three-order Lie symmetry
In this paper, based on hyperbolic tanh-function method and homogeneous balance method, and auxiliary equation method, some new exact solitary solutions to the
The perturbations to symmetries and adiabatic invariants for nonconservative systems of generalized classical mechanics are studied. The exact invariant in the
A symmetry and a conserved quantity of the Birkhoff system are studied.The symmetry is called the Birkhoff symmetry.Its definition and criterion are given in th