指标误差

In the non dimensioned time domain,the generalized quadratic performance criterion of error state transits into the optimal problem of structural parameters,thus gets an optimal parameter system—optimal damping control system with big margin for stability,little number for oscillation,small overshoot,and small setting time.

在无量纲时域中，把状态误差的广义二次型性能指标转换成结构参数的优化问题，从而得到一种稳定裕度大、振荡次数少、超调小、调节时间短的最佳参数系统——最佳阻尼控制系统。

In the non_dimensional time domain,the generalized quadratic performance criterion of error state is transited into the optimal problem of structural parameters,thus to get an optimal parameter system_optimal damping control system with big margin for stability,little number for oscillation,small overshoot and small setting time.

1引言利用优化系统的结构参数，使之输出的动态性能达到最佳程度，传统方法都是在时域或频域中进行，典型的有&ITAE&准则［1］及电子最佳调节理论［2］，基于无量纲时域中的误差状态二次型性能指标的优化方法，是一手种新的最佳参数化方法［3］，可使系统对于输入作用的阻

For the FA, the results indicated that the VPD calculation using mean of 24 hourly temperature values as saturation vapor pressure, and wet-bulb depression as actual vapor pressure yielded the lowest error, the least range, and the most frequency with the highest WI. These outcomes were as well as the SIA with the lowest EMSE, R^2 higher than 0.99 and the highest CE.

分析结果显示，以频率分析法而言，各地农业气候分区均呈现，VPD计算式以24个时温度日平均为饱和蒸汽压力，与湿球下陷量为实际蒸汽压力，具误差最少、全距最小、出现频率最多及最高权重指数，性能表现最佳，这样的结果，对照统计指标法之检测评估，同样具最低RMSE、R^2值0.99以上及最大CE，性能表现优於其他所有VPD计算式，两者，结果一致。

The key technologies of Grid Method including grid divided in basin, impact radius of rainfall and number of reference rainfall stations have been discussed with example. The parameters of Grid Method have been selected through trial and error. Using simple random sampling to simulate the failure to collect rainfall, the relation between surface rainfall calculation error and station density, station distribution, uneven spatial distribution of rainfall has been sought.

论文探讨了流域网格剖分、降雨影响半径、搜索半径范围和参证站数量等关键技术，研究了网格法参数的优选，并采用简单随机抽样模拟降雨缺测情况，给出了面雨量计算误差与流域站网密度、均匀度、降雨分布不均匀性指标的关系。

Series of criterion of evaluation is put forward and test and evaluation platform of tactical unit is established, including air strike model,measurement error model and evaluation arithmetic model.

提出了评估指标体系，建立了测试与评估试验台，其中包括空袭模型、测量误差模型、评估算法模型等，并在此基础上通过模拟典型空袭模式给出部分评估结果。

Dept.of surv.

然而EDM作为一种光学和电子器件组成的测量仪器，由于生产、运输、使用过程中的误差、震动和环境因素的影响以及电子器件本身的老化等，导致仪器的部分性能指标发生变化，最终是使测距仪测量观测值的精度受到影响。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。