精度

Initial alignment is one of the key technologies which affect the effectiveness of the inertial navigation system.

惯导系统的初始对准是影响系统使用性能的关键技术之一，对准的精度与速度直接关系到惯性系统的精度与启动特性。

In the spothesis test of modern inertial system, the position accuracy is the key to the test table.

现代惯性系统的综合测试对测试设备的精度要求越来越高。而测试转台的位置精度更为关键。

The hexapod stiffness, which is moveable platform stiffness relative to fixed base frame, generally, is a non-symmetric matrix. It can map the infinitesimal increments in the displacement and in the applied forces , representing the characteristics of forces/displacements in incremental form and relating to machine head displacements when subjects to externally applied force system. It is no doubt that the displacements will affect machine accuracy, especially with the tool under changeable load system.

六杆机构加工中心的刚度意味着输出端移动平台相对于固定基础平台的刚度，一般地，它是一个非对称的刚度矩阵，它将位移微小增量转换成微小力增量，表现了增量形式的力/位特征，关系到机床加工头受有外载荷系统时的位移，直接影响到加工精度，特别是变载荷系统下的加工精度。

By using K-ε twoequation model to modify turbulent flow, the simulation results could coincide better with the real filling processes. Combined flow path analytical program which was used to revise the ingate velocity, it increased the accuracy effectively, and raised the calculating velocity.

该软件首次采用非均匀网格剖分技术，更为逼真地反映了铸件的几何形状；耦合计算过程中，采用简化耦合算法，避免了繁复的迭代过程，缩短了迭代时间，且计算精度能满足工程要求；采用K-ε双方程紊流模型对紊流流动进行修正，模拟结果更加符合实际充型过程；联合流路解析程序修正内浇口入流速度，有效地提高了计算精度，加快了计算速度。

The test precision of initial measure system cannot exceed the precision limited by alignment error, so initial alignment is a very important problem in develop and application of the system.

惯性测量系统的测量精度不可能优于对准误差所限定的精度，因此初始对准是捷联惯导系统的研制与应用中一个关键的问题。

So they are cleared up. The precision and velocity of initial alignment are decided by the precision and velocity of the value of the state variables.

而估计的精度和速度又由系统的可观测性所决定，故初始对准的速度和精度在很大程度上由系统的可观测性所决定。

aining at high impedance weak signal measurement,the relations among measuring precision,input impedance and input bias current,the guard technology is applied to design a measuring circuit with guard circuit,adding a guard potential to low-impedance nodes of circuit,the effect of leakage current is reduced.using spice simulation and validates that guard circuit can increase the input impedance of the system and lower the input bias current,the results show that the guard circuit provids a valuable solution for high accuracy measurement of the high impedance weak signal.

摘 要：针对高阻抗微弱信号测量问题，对测量精度与系统输入阻抗、输入偏置电流的关系进行分析，应用保护技术设计了带保护电路的测量电路，将电路中的低阻抗节点加上保护电势，减小漏电流的影响。通过pspice仿真分析，验证保护电路能提高测量系统的输入阻抗和降低输入偏置电流，结果表明保护电路技术能实现对高阻抗微弱信号的高精度测量。

The Electrochemical measurement system used to perform DPSV measurement is constructed with two parts, a low-current measurement system consists of low input bias current operational amplifier and a high resolution SAR ADC and a potentialstat consists of high resolution DAC and high current buffer amplifier.

对于差分脉冲伏安溶出测量，我们使用高精度连续逼近寄存器型ADC和低偏置电流运放构成微电流采样系统；使用高精度DAC和高速大电流缓冲放大器构成了恒电位计，在微控制器的控制下组成电化学测量系统。

As a result, the achieved uncertainty of time measuring is±125 ps, demonstrating an accuracy improvement in magnitude of an order. The achieved precision of speed measuring is 0.1% of the scanning speed. In hardware design, the intactness of the camera's original structure has been maintained to the very extent, the facility of assembling and disassembling devices have been achieved.

在设计制作中采用了单色性和方向性好的激光作为光源，选取了高速响应和有高速处理能力的一系列器件、芯片，因此时间测量的精度达到了±125 ps，比以往的测试方法提高了1个数量级以上，速度测量精度达到扫描速度的0.1%。

The problem of finite precision multiuser decorrelator is formulated as linear bounded integer optimization problem,and the problem is shown to be NP-hard problem.

该文首先分析了应用有限精度序列为解相关矩阵序列的解相关接收机，将有限精度解相关的多用户检测问题归约为线性约束整数优化问题，同时证明此问题为NP-hard问题。

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。