一类生化反应系统微分方程模型的极限环 limit cycles in a class of biochemistry reaction systems
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First we decompose the simple network into several basic parts and set up the corresponding dynamic models . then the model of the whole network can be easily combined 我们以单一瓶颈链路的简单ip网络为对象,通过建立网络基本单元状态方程模型来实现整个网络系统的数学解析模型。
Three - dimensional gas flow field in the new vortex quick separation system with an inner component of fcc disengager was simulated based on the reynolds stress model ( rsm ) provided by cfx 摘要用cfx软件对催化裂化沉降器新型旋流快分器的气相流场进行了三维模拟,湍流模型采用雷诺应力输运方程模型。
Compared with the previous model , the most important advantage of this improvement is that the close - open operator is used in the diffusion process , giving a good trade - off between noise removal and edge preservation 主要的想法是在中值曲率驱动方程模型中结合闭开算子,在较好保护边界的前提下,增强方程的去噪能力,达到去噪和保护边界的一个平衡。
More often , the standard k - turbulent model is used . but there are some disadvantages of it . in this article , the kng - k - turbulent model is used which can make good result on transient flow and bend flow 在水电站工程实际应用中以往多采用的是标准的k -两方程模型,而本文采用了在标准k -模型基础上变形的重整化群k -模型( rng - k -模型) 。
In this paper , firstly , the mechanism of laser plasma shock wave ' s form , the basic formula of the theory of shock wave , the state equation of the shock wave in the water and the relation of the parameters of the shock front are studied 本文首先讨论了激光等离子体冲击波的形成机理、冲击波理论的基本关系式、水中冲击波的状态方程模型以及冲击波波前参数的关系。
Conclusion structure equation model not only can explain the relation between the factors and medical students ' psychological health , it also can he used to verify the mechanism that they influence each other from a mathematical way 结论结构方程模型不仅能提示各个因素对医学生心理健康存在的影响,而且对各影响因素与心理健康之间的作用机制有了深入的、数理角度上的证实和理解。
The two - equation turbulence models can be thought to consist of two more or less separate parts : the scale determining model , which provides scalar information about the turbulence , and the constitutive model , which determines the reynolds stress tensor 所涉及到的两方程湍流模型一般包含两部分:一是尺度标定模型,它给出了湍流的标量信息,如两方程模型的尺度因子,或者。
The fluid flow of molten steel in the continuous casting mould for compound roll has been simulated numerically using the - double equation model of turbulence to discuss the effects of casting speed and pouring angle on the fluid flow 摘要采用湍流两方程模型,对连续铸造复合轧辊组合结晶器内钢液的流场进行了数值模拟研究,分析了拉坯速度及浇注倾角等工艺参数对组合结晶器内钢液流场的影响。
Results from cross - lagged regression analysis indicate while social preference , social / leadership behaviors in time 1 are positive predictors of achievement and aggressive behaviors is negative predictor of achievement , achievement is positive predictors of self - perception social competence 结构方程模型分析显示,前测的社会能力能预测后测的学业成就,但前测的学业成就不能预测后测的社会能力。
We have carried on an investigation in term of questionnaire to the manufactures , which were examined by the iso9000 in hunan , guangdong and guangxi provinces . the collected data is analyzed by spss statistics and structural equation model 本文对供应商为制造企业创造竞争优势的理论模型进行了实证研究,是以湖南、广东和广西三省通过iso9000认证的制造企业为研究对象,所采集的数据使用spss和结构方程模型来进行分析。