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A criterion is put forward to adjudge the degree of approach of the solar collector to a first order system.

稳态测试方法中,时间常数是判定集热器是否达到稳态或准稳态的依据。

A C++ program is developed for composing the stiffness matrix of the temperature field, saving it in changing bandwidth method and calculating the linear algebraic function group through using the Gauss eliminating method. A module for drawing the color fringe of tire temperature field is created, which makes the result more visual. Taking the 9.00-20 cross-ply tire on CA1092 as an example, the finite element numerical simulation analysis of automobile tire 2-D steady temperature field is completed. Through comparing the result with the analysis data by ANSYS, this software is proved to be capable of the modeling, calculating and post-processing of FEA of automobile tire 2-D steady temperature field.

采用C++语言完成了温度刚度矩阵的总体合成及其一维变带宽存贮,以及线性代数方程组高斯消去法求解等工作,采用C++语言实现了汽车轮胎二维稳态温度场云纹图的绘制,使得计算结果更加直观,也更能形象地显示汽车轮胎二维稳态温度场的分布状况,以CA1092(原CA142)五吨载货汽车用9.00-20尼龙斜交胎为例,进行了汽车轮胎二维稳态温度场有限元数值仿真分析,通过与ANSYS分析结果进行比较,说明所开发的有限元建模、求解以及后处理软件能够用于汽车轮胎二维稳态温度场有限元分析。

By the supplementary variable method the steady state equations and probability generating function for the customer number in the system including one customer in service are obtained. The stability conditions under which the steady state solution exists, the average customer number and the average sojourn time in the system.

通过补充变量法,首先建立了系统稳态下的状态转移方程,用概率母函数的方法求解得到了稳态下系统队长的概率母函数,进而求出系统稳态解存在的稳态条件和稳态下系统的平均队长和顾客在系统中的平均逗留时间。

During the process of calculating the stable temperature rise of an electromagnet, the power in the cold state can be used as a heat source if electrical resistance changes of the coil from the cold state to the stable state have few effects on the power.

在计算电磁铁的稳态温升时,若线圈电阻从冷态到稳定发热时的变化对发热功率影响不大,可将冷态时的发热功率当作热源进行计算,应用稳态热路法计算线圈的稳态温升。

To investigate the pitting and metastable pitting rules of type 304 stainless steel, potentiodynamic polarization method was employed to study the behavior of metastable pitting and stable pitting on 304 stainless steel in sodium bromide solution and borate/phosphate buffered bromide solutions. The influence of the concentration of Br-、the pH value、the buffer capacity and general environmental factor to pitting potential and metastable pitting was studied as well.

为了更深入地了解304不锈钢的稳态及亚稳态孔蚀规律,本文采用动电位慢扫描法测得了304不锈钢的阳极极化曲线,研究了不锈钢在纯溴化钠溶液及含溴化钠的硼酸盐或磷酸盐缓冲溶液中的亚稳态孔蚀以及稳态孔蚀行为,分析了溴离子浓度、pH值、缓蚀性阴离子、以及缓冲容量和综合环境因子对孔蚀电位以及亚稳态孔蚀特征参数中的形核数目、峰值电流、生长寿命的影响。

By using complementary variable method to analyze the state-changing equations of this queueing system, the generating function of stationary probablity distribution of retrial queue length, some performance indexes such as three different stationary state probablity,stationary availability, and stationary failure frequence of the transfer-unit are derived.

研究通信网络中交换单元的可修模型M1,2,3/G/1,呼叫的到达是重试性的,利用补充变量法对排队系统的状态转移方程作了分析,求得了重试队列稳态队长概率分布的母函数以及交换单元的处于三种不同状态下的稳态概率、稳态可用度及稳态故障频度等性能指标。

It is also shown that under the same conditions, the values of the LWI gain with incoherent pumping are evidently larger than those without incoherent pumping exceptΦ=0 and the time reaching the steady state is shorter; varying the initial condition doesn't change the stationary value of the LWI gain but can remarkably affect the transient evolution process of the LWI gain.

研究还表明,与不存在非相干泵浦时相比,除了相对位相Φ=0的情况外当存在非相干泵浦时系统可得到大得多的稳态增益,而达到稳态所需的演化时间也短得多;初始条件的变化不改变稳态增益的大小但对瞬态演化过程有明显的影响。

For the first patern, elastic dynamics is adopted to study the steady state rolling contact, elastic dynamics incorporating with rigid dynamics is adopted to study the non-steady state. For the steady state, the analytical solution is obtained, and for the non-steady state, the variational formulation to solve the problem numerically is derived For the later patern, the function type friction coefficient is introduced. On the basis of the quasi-stastic theories of constant friction coefficients, both the exact theory and the simplified theory of the function type friction coefficient are established, the computer programms for both the theories are also made out. Using the function type friction coefficient, Shen-Hedrick-Elkins theory's application range is extended to large creepage .

对于速度对接触体力学特性的影响,本文采用弹性动力学方法和弹性动力学与刚体动力学相结合的方法分别对稳态和非稳态两种情况进行了研究,得到了稳态情况的解析解,给出了对非稳态情况进行数值求解的变分公式;对于速度对相关物理量的影响,本文主要讨论了速度对摩擦系数的影响,在滚动接触准静态理论的基础上引进了函数型摩擦系数,建立了函数型摩擦系数的滚动接触准静态精确理论和简化理论,并分别编制了相关的计算程序,还用函数型摩擦系数将简便的Shen-Hedrick-Elkins理论的适用范围扩展到大蠕滑区。

In this dissertation,a new mechanism of stochastic resonance in the excitablesystem is presented,and the relationship between the stochastic resonance inexcitable neurons and the dynamic bistability is reported for the first time.Thepresent study deals with the extension of the concept of stochastic resonance,which has been thoroughly examined in bistable and simple excitable system,to amore complex system.It may even open the door to a better understanding ofstochastic resonance in neural system since experimental evidence supports theextension of such bistability in vitro preparations.

本文提出了可兴奋性系统中一种新的随机共振机制,首次报道了可兴奋性神经元中随机共振和动态双稳态的关系,将以前的单纯讨论双稳系统或可兴奋系统中的随机共振推广到了可兴奋系统中有动态双稳态更复杂的情形,由于在神经元的实验中已有关于动态双稳态的报道,本文所提出的随机共振为理解神经元中随机共振的编码机制开启了新的途径。

The model applies to emission prediction of the stationary and thirteen operating conditions successfully.2 Based on the study of the differences and influence factors of transient and stationary condition emission a double model method predicting the emission in automobile operating condition based on engine stationary testing was put forward.

在此基础上,建立了内燃机稳态排放性能预测模型,并将该模型成功地用于内燃机稳态排放特性及十三工况循环排放预测。 2在对内燃机瞬态排放与稳态排放差异及影响因素进行深入分析的基础上,提出基于内燃机稳态测试进行汽车工况法排放预测的双模型预测法。

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It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发,分析对称连杆曲线上鲍尔点的产生条件,提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品,年生产总值3000万美元,产品价廉物美、选料上乘、质量保证,深受国内外客户的青睐

The eˉtiology of hemospermia is complicate,but almost of hemospermia are benign.

血精的原因很,以良性病变为主。