精确

Without using Lie derivative and Lie bracket operation of differential geometry , we only use the algebra method to give a sufficient condition of single input exact feedback linearizable bilinear systems.

摘 要 研究了单输入的双线性系统的精确线性化及其鲁棒控制器设计问题，避免了用微分几何的李导数、李括号的复杂运算，只用纯代数的方法给出了一般单输入双线性系统精确线性化的充分条件。

It will be widely use to broaching the high quality PCB board and other accurate mechanical broaching, and so on.

种高质量PCB的钻孔和各种机械部件的精确钻孔等其它精确钻孔的应用。

Based on the involute's basic principles and theoretical formulas, input the involute's formulas of cartesian coordinates into the equation editor, accordingly create the precise involute of gear's contour. Based on the formula of helical gear's parameters, accurately create a curve of tooth profile. Create the chraceristics of helical gear by ordering of swept blend and array.

依据渐开线生成的基本原理和理论公式，在方程编辑器中输入渐开线的笛卡尔坐标方程，从而生成精确的齿轮轮廓渐开线；根据角变位斜齿轮各参数的计算公式，精确创建了齿廓曲线；利用扫描混合和阵列命令创建斜齿轮的轮齿特征。

The rules of Chinese place names are also used in the model.We applied this approach to a Chinese morphological analysis system,and achieved 90.24% recall and 93 14% precision in clos...

该模型对自动分词的切分作了有效的调整，系统闭式召回率和精确率分别为 90 2 4 %和 93 14 %，开式召回率和精确率分别达 86 86 %和 91 4 8%。

In this paper, a modeling compensating method used to compensate the linearity and temperature effect of measurement systems is proposed.

引言精确测量是测量与测试技术最重要的发展方向之一，为了提高测量准确度，实现尽可能精确的测量，多年以来，人们采用了多种多样的方法和手段。

The Adolph accurate dynamic model cannot describe the movement of the reciprocating pump valve at the moment of opening, thereby a new accurate dynamic model for describing the motion law of an automatic conical valve is set up, in consideration of the condensability of the fluid, the Westphal's effect, the condition of the continuous flow of fluid and the dynamic characteristic of pump valve's motion.

针对阿道尔夫往复泵泵阀精确运动微分方程在泵阀开启瞬间存在奇点的不足，综合考虑液体可压缩性、魏氏效应、液体连续流条件及泵阀运动的动力特性，建立了描述往复泵自动锥形阀运动规律的精确运动微分方程。

The PSE in the curve coordinate systems are solved by the numerical techniques developed efficiently in this paper. A normal transform is introduced, and there are enough much grids in the region between the critical layer and the wall, where the variation of the disturbance is the quickest. The finite-difference of governing equations with fourth-order accuracy in the normal direction is utilized in full regions including points close the wall, and is very important for accurately discreting equations.

对于曲线坐标系下的抛物化稳定性方程，文中发展了求解的高效数值方法：引进法向变换，使得在临界层与壁面之间的扰动量变化最快的区域有更多的法向网格点；导出包含边界邻域在内的完全四阶精度的法向有限差分格式，这对方程精确离散至关重要；采用全局法和局部法相结合的方法及其新的迭代公式，大大加速收敛并得到更精确的特征值。

Moreover, they are not suitable for gears manufactured by different cutting tools. Based on gear generation principle, a new method to establish accurate 3D solid model of cylindrical gear by mechanism function of Pro/E is proposed. Taking the manufacture of spur-gear with pre-grinding hob as an example, this method is introduced in details and the accurate 3D solid model is set up.

以范成法加工齿轮的原理为理论基础，介绍在Pro/E平台下利用其机构模块的"轨迹曲线"功能精确构建各种刀具加工出来的渐开线圆柱齿轮齿廓曲线的方法，并以磨前滚刀加工直齿圆柱齿轮为例，详细介绍该方法的使用步骤，构建其精确的三维实体模型。

A class of affine nonlinear system of single input-single output is investigated. Firstly, the nonlinear system is transformed into an equivalent linear system through a diffeomorphism transformation. The networked control problems for the delays are constant, stochastic and shorter than a sampling period, and long and stochastic are investigated respectively.

针对一类单输入-单输出仿射非线性系统，首先通过微分同胚变换实现了仿射非线性系统的无反馈精确线性化；然后基于精确化线性模型，分别讨论网络延时为常时滞，随机时滞小于一个采样周期和随机长时滞情况的控制问题。

By means of the discrete frequency spectrum, the frequency spectrum leakage s of the conventional DFT and the DFT with a Hanning window are comparatively analyzed in this paper.

利用离散频谱详细对比分析了DFT的频谱泄漏和加汉宁窗DFT的频谱泄漏现象，讨论了用异步顺序采样值计算电量产生误差的原因，提出了利用异步顺序采样值精确计算电量的方法，实现了畸变电量的精确测量。

Objective: To study the effect of polycythemia on blood oxygen saturation.

裴蕾目的：观察RBC剧增而引起的高粘血症对血氧饱和度的影响。

Based on SIMPLER algorithm in the curvilinear body-fitted coordinates, the calculations were performed for Pr=0.7, Re=10~1000 on non-orthogonal non-staggered grids which are generated by elliptic equation systems.

采用曲线坐标系下压力与速度耦合的SIMPLER算法，数值研究了周期性渐扩渐缩波纹通道内脉动流动与换热情况，流动Re数的范围为10~1000，Pr数为0.7。