In this paper , metastable cu - al alloy powder with different aluminum content was prepared by mechanical alloying technique . high strength and high conductivity cu - al2c > 3 composites were prepared by a new type vacuum internal oxidation technique 本文采用机械合金化法制备了不同铝含量的亚稳态的cu - al合金粉末，采用新型真空内氧化工艺制备了不同成分的高强度高导电cu - al2o3复合材料。
Therefore 3d static numerical simulation was applied to the jl475 engine with dual - intake port , the boundary condition of calculation was achieved through the experimental test . the main works in this paper are as follows : 1 因此，本课题采用标准的k -湍流模型，将实验测试数据作为进气道分析的边界条件，对具有两个进气道的四气门jl475发动机的进气道进行了三维稳态的数值模拟计算。
As the reaction time and standing time increase , the percentage of calcium oxalate trihydrate ( cot ) decreases and the percentage of the thermodynamic stable calcium oxalate monohydrate ( com ) increases . the metastable calcium oxalate dihydrate ( cod ) is not observed 随着反应时间和陈化时间的增加，三水草酸钙( cot )直接转化为稳定态的一水草酸钙( com ) ，而没有经过亚稳态的二水草酸钙( cod ) 。
In the second part , a method studying stochastic transition which is the master equation method is introduced , and explicit solutions of velocity v and diffusion constant d of the steady state are obtained when a particle hops among a dimensional and periodic n states 第二部分介绍了一种研究随机跃迁的方法?主方程方法，着重推导了粒子做一维周期性n态随机跃迁时达到稳态的速度、扩散系数的一般表达式。
This part focuses on changes of the social order so as to make clear explanation on homeostasis and social homeostasis , to explore origins of reaching development in the homeostasis , and to provide detailed analyses on three main development - reaching mechanisms 这部分以社会序变能力为切入点，厘定了稳态、社会稳态的基本内涵，探寻了社会在稳态中实现发展的根源，并对实现发展的三种主要机制进行了具体的分析。
Firstly , the dissertation reveals at length the procedure of reference signal generating of adaptive array for the first time and presents the premise of adaptive array transforming from a transient state to a stable state and introduces a concept , threshold signal - to - interference noise ratio , sinrth 首先，首次全面深入地揭示了自适应阵参考信号的建立过程，提出了自适应阵由暂态进入稳态的条件，并引入了门限信干噪比sinr _ ( th )的概念。
When the stationary working current is lower than the critical current of the electromagnetic - elastic system , a numerical program is established to simulate the dynamic responses of the deformation of the current - carrying magnet subjected to a pulse current with rectangular shape 结合其超导载流磁体的实验结构，给出了超导磁体在不同稳态工作电流(即低于稳态的磁弹性失稳临界电流)作用下受到矩形脉冲电流作用时的磁弹性动力响应的数值模拟结果。
A variety of mathematical models based on continuous equation and the momentum equation and many solutions partial differential equation value computational method in the open canal turbulent flow solution , still could widely apply and yield the satisfactory result 但是,非稳态的navier - stokes方程对于明渠水流的瞬时运动还是适用的,以连续方程和动量方程为基础,建立的各种数学模型和许多求解偏微分方程的数值计算方法在明渠紊流的求解中仍能广泛应用。
However , in fact , thephysical parameters and dynamical character of the structure duringthe occurrence ofdamage are time - varying , and the response signalbehaves a non - stationary character . thus , it is generally recognized that the linear time - varying ( ltv ) model is moreappropriate and better than linear time - invariant ( lti ) model to capture theinstantaneous dynamical behaviors 然而事实上,结构的损伤使得其物理参数和动态特性随着时间而变化,结构的响应具有非稳态的特征。因此,利用线性时变系统模型,获取系统的时变特征,才更有利于结构破损诊断,线性时变系统的参数识别也受到了越来越多的关注。
In chapter 3 , the non - linear equation was linearized with the jacobi matrix , and then the linearized equation was transformed into fixed frame to analyze the stability problem with eigenvalue method ( on - ground or hovering ) or floquet theory ( forward flight ) . meanwhile , the equation was perturbed by sweep frequency excitation from steady state to get transit decay of lag response which was then transformed into fixed frame with a numerical fourier coordination transformation ( fct ) . the fixed frame response along with the body response was analyzed via an fft to determine modal frequencies 然后,在稳态响应的基础上利用雅各比矩阵对非线性方程进行了线化,线化后的方程利用多桨叶坐标变换转换到固定系下后,利用直接特征值分析(地面、悬停)或floquet理论(前飞)对系统进行了稳定性分析;同时,对系统进行了瞬态响应分析;在系统达到稳态的基础上进行扫频激励,用fft变换求得系统频率,进而用移动矩形窗方法分析得到系统的阻尼。
