参数变化

The density of active centers increases first and then decreases with the increase of the amount of Ti.(3)The activity of hydrogenolysis decreases with the increase of the a

另外，当催化剂中Ti的含量在0.25—1.0％时，上述各种参数随Ti量而变化的幅度不大，这可能是因为催化剂中未被还原的Ti~(4+)具有增强Pt的活性的作用，因此它部分抵消了Ti~或Ti~0所起的减弱Pt的活性的作用。

Objective Using X-ray cephelometrics,we analyzed the effect of the setback and the advancement of the jaw bone on the position of the hyoid bone and the hypopharyngeal airway,so that we could purpose some suggestions for the clinical treatment.

目的 通过X线头影测量分析了解颌骨后退与前徙对舌骨位置及咽下气道变化的影响情况，为临床治疗提供参数。

The shear moduli in two directions were assumed to vary in terms with hyperbolic function .

假设剪切模量沿着梯度方向都按双曲函数变化，采用积分变换-对偶积分方程方法，求得了裂纹尖端应力场和应力强度因子，并研究了材料不均匀参数对应力强度因子的影响。

Results showed that Latin Hypercube sampling can capture more variability in the sample space than simple random...

这表明由地统计学随机模拟所参数化的LANDIS模型可用于大时空尺度森林景观变化的预测

Electrical resistance and inductive reactance of the welding circuit are also taken into account. Besides, the temperature-dependent electrical, thermal and mechanical properties of materials as well as the water-cooling and air-cooling conditions are considered in detail.

该模型还第一次包括了焊接回路电参数的影响，此外，模型中还详细考虑了各种随温度变化的材料电、热物理性能及力学性能、电极水冷、表面空气散热的影响等，使得模型更加符合实际情况。

Department of Industrial Equipment and Control Engineering, South China University of

本文中对充模过程中模腔内空气的状态变化情况进行了计算，通过对计算结果的分析，说明制品缺陷产生的原因和排气槽参数选择的原则。

Finally, calculate on the actual situations of Sanbanxi Project on the basis of above theoretic outcome of researches and achieve a result accordant with the data of model test; and, taking this project as the object, make a study on the influence of water level variations at the infall of tunnel exit on hydraulic parameters of closure gap and conducts sensitivity analysis.

最后，利用上述研究的理论成果，对三板溪工程的实际情况进行计算，取得了与模型实验数据较吻合的结果；并以此工程为对象，研究隧洞出口汇流处的水位变化对龙口水力参数的影响程度，进行敏感性分析。

We study the axial distribution of the plasma characteristics versus the input power.

本文研究了等离子体特性参数的轴向分布随外加功率的变化。

The method of slide-mode variable structure control is such a strategy that is characterized of low mathematical model precision, insensitiveness to system parameter variation and external disturbances, omission of parameter identifications, fast dynamic response and easy implementation. These advantages make it suitable to high performance vector controlled AC motor drives.

滑模变结构控制是一种强鲁棒性的控制方法，对系统数学模型精度要求不高，具有快速响应、对参数及外部扰动变化不敏感、无需系统在线辨识，实现简单而且很适合计算机实现等优点，因此，很适合高性能的交流电机矢量控制系统。

Because the workpiece is in dynamic balance, the resultant moment acting on it should be zero. Introducing the moment from lapping tool and press head a moving differential equation is built. In this equation only workpiece rotating speed is unknown. It means that workpiece rotating speed can be got by this equation. Since there is a transcendental function in integral function of the equation an analytic result can not be got, only digital result can be got by a computer. Thus a change rule of workpiece rotating speed with lapping parameters is known, e.g. the radius of press disc ball socket, radius of press head ball, the distance between the workpiece rotating axis and lapping tool rotating axis, workpiece radius, modulus of elasticity of the press head and press disc, friction coefficients between the lapping tool and workpiece, and between the head and disc, pressure between the lapping tool and workpiece and pressure between the press head and press disc.

因工件处于动态平衡状态，其上所受到的来自于磨具和压头的力矩应相等，将二力矩表达式联立，建立工件运动微分方程，该方程中只有工件的旋转角速度是未知量，因此可以求出工件旋转角速度，但该方程积分式中含有超越函数，得不出解析解，只能通过计算机求出数值解，得出工件旋转角速度随各研磨参数的变化规律，如压盖球座半径、压头的球头半径、工件回转中心相对磨具回转中心的偏心距、工件半径、压头和压盖材料的弹性模量、磨具与工件间的摩擦系数、压头压盖间的摩擦系数、磨具与工件间的压强、压头压盖间的压力等。

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