精度

At first, we proposed the principle of measuring the wavelength of continuous wave tunable laser by using multiple vernier etalons.

实验证明，波长计的重复测量精度优于±50MHz，定标后绝对精度好于±200MHz，测量波段为0.4-1.1μm，适用于激光器的自动扫描控制。

After all, an OAA style experimental set-up in a single expansion chamber silencer for engine exhaust noise control was developed. Three kinds of software for the AANC system, the AANC system combined with the ALE, and the AANC system combined with the proportional tuned PDC were programmed.

结果表明：该系统在部分消除了影响次级通道建模精度的宽带干扰噪声的同时，充分发挥了前向窄带控制系统的作用，提高了次级通道建模精度，系统稳定性及消声性能得到提高。

The paper feed guide rails adopt high degree of hardness, bearing steel-made linear guide rails,coupled with high-precision grinding T-shape lead screws thereby substantially reducing the likelihood of inaccurate paper feed positioning and effectively guaranteeing the cutting precision.

液晶数显能很有效的保护操作者的眼睛不易疲劳，且使用寿命更长。送纸器导轨采用硬度高，为轴承钢材料的线性导轨配上精度高的磨削T型丝杆，大大降低了送纸器定位不准的可能，有效的保证裁切精度。

A series of simplified mathematics models for analyzing the precision of the firing initial data and assessing the firing efficiency under the condition of computer are established to the accompaniment of software application which could be used in the determination of firing initial data, real-time precision analyzing and aided decision making.

建立了计算机条件下射击开始诸元精度分析和射击效率评定的一系列简化数学模型。建立了决定火炮射击开始诸元、实时精度分析和辅助决策的应用软件。

The fold line trajectory model is used to calculate the firing data of red land laser terminal-guided projectile.The experiments demonstrate that the fold line trajectory model has advantages as below.One is the fold line trajectory model can truly reflect the fly discipli...

试验结果表明，&折线法&弹道模型具有以下优点：一是模型能较为真实地反映&近区域&射击时末制导炮弹飞行规律；二是运用该模型决定末制导炮弹射击诸元，精度较高，完全能满足射击的精度要求。

In our research, a 3-D numerical simulation calculation of the outside flow field of the flat-headed van-body truck has been made first. A RNG k-? turbulence model which can increase the calculation precision of the separation flow has been adopted, and the results show that the calculation of the van-body truck with the RNG k-e turbulence model is more exact than that of the standard k-e turbulence model.

本研究首次对平头厢式货车外部流场进行了三维数值模拟计算，模拟采用可以提高分离流计算精度的RNG k-ε紊流模型，计算结果表明其计算精度较标准k-ε紊流模型有显著的提高。

The results show that the two ultrasonic flowmeters have high precision and stability, their maximal relative errors are 1.60% and 0.39% respectively.

结果表明，两款流量计最大相对误差分别为1.60%和0.39%，均具有较高的测试精度，稳定性也较好，能满足泵站现场测试的精度要求。

There are many factors affecting mountain seismic survey accuracy and efficiency there, i.e. the height accuracy of GPS survey and the operating efficiency under the conditions of forest-covered area and rough topography.

影响山地地震测量精度和作业效率的因素很多，主要是GPS测量的高程精度、森林覆盖区、恶劣地形条件下的作业效率等问题。

Simultaneously, the exports of ionization rate and nonionzed concentration are set up as a powerful tool for studying thoroughly the freeze-out effect. dN〓/dp and dN〓/dn are neglected in the linearized equation system of the iteration methods of Newton and Gummel, due to having lower 15 orders or more than dN〓/dn and dN〓/dp, thus the computing effort is cut down with no effect on precision. A new cut-off technique is adopted to accelerate the convergence speed, about twice reduced for Newton iteration method and six times or so for Gummel iteration method. The approximate formulae of Fermi-Dirac statistics are also put forward with simpler form and higher precision. 3. A term dependent on time is added to the electron and hole current succession equations respectively. It is only this model that conservation of charge in transient analysis and alternating small-signal analysis at low temperature can be kept by. 4. The performance of SE-PISCES is explained by the simulation example of PISCES-2B, diode.

研究了低温半导体器件模拟的数值方法：对载流子浓度进行了新的归一化；编制了不考虑掺杂所引进的内建电场时的电离率计算程序；由于低温杂质电离率随偏压状态而变化，为此编制了每次求解迭代时的电离浓度计算程序，并将其插入到求解迭代程序中；同时，设置了杂质电离率和未电离杂质浓度的出口点，为更深入地研究冻析效应提供了有力工具；在Newton迭代法和Gummel迭代法的线性化方程组中忽略了dN〓/dp、dN〓/dn，是因为它们比dN〓/dn、dN〓/dp低15个数量级以上，这样减小了计算量又不影响模拟精度；对Newton迭代法和Gummel迭代法采取了新的截断技术，提高了收敛速度，Newton法迭代法和两次左右，Gummel法减少六次左右；给出了表达式更简单而精度更高的Fermi-Dirac积分近似计算公式。

The average current in every phase is obtained by means of Pulse Width Modulation, frorn which becomes the composed vector, and the driving on fractional step angle of stepmotor can be realized.

从而构成合成矢量，实现分数步进角的驱动。实验结果表明，其转角精度高于任何数字编码器的分辨率，极大地提高了步进电机的伺服精度。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。