查询词典 error model

In this study, based on the Rnl, extinction coefficient k, transition coefficient of canopy layer stomatic resistance K', aerodynamics resistance ra and rc calculated with the data of Rn, LAI, rsi, the daily transpiration variation of Picea purpurea, Larix principisrupprechtii, Hippophae rhamnoides ,Betula platyphylla and Populus cathayana were studied in Datong County, Qinghai Province. Comparing with the practical transpiration variation measured by Li1600 Steady Porometer, the relative error of this model was less than ±15%, and the results were stabilized and tested by precision analysis.

本研究通过对Rn、LAI、rsi的实地观测，确定了林冠截流净辐射、消光系数、冠层阻力转换系数、空气动力学阻力和冠层整体气孔阻力，对青海大通地区紫果云杉、华北落叶松、沙棘、白桦和青杨的日蒸腾过程进行了模拟，与用快速称重法订正的Li1600稳态气孔仪实测蒸腾结果对比，模拟的相对误差在±15%以内；模型敏感性分析发现，温度、LAI以及rsi是决定模拟结果的主要参数，模型对各参数变化反应不敏感。

The vertical and horizontal postglacial rebound is detected by measuring site velocities and length rates of baselines respectively using data from space geodetic measurement of VLBI. The comparison and correlation analysis between space geodetic results and predictions of postglacial rebound from the geophysical model ICE-4G is shown. And the system error between space geodetic results and ICE-4G predictions is also discussed.

利用VLBI的实测数据和ICE-4G模型，采用实测站速度和基线长度变化率分别检测了冰期后地壳回弹的垂直运动和水平运动，并对用空间技术求解的实测值和用ICE-4G模型求解的估计值进行了数理统计分析，最后给出了实测结果与地学模型估计值之间的系统差。

In the model of intersection, the instruments had to be levelled and orientated relatively by aiming at mutually. Because levelling is manual and there is no mark of theodolite′s center which can be aimed at, the error of the common method of self-locating is too big to be allowed for precisional indus trial measuring.

前方交会这种自定位方式，必须先整平仪器，并使两台仪器相互瞄准实现相对定向，由于整平误差和定向误差，使得这种自定位方式的精度无法提高，严重阻碍了此系统用于精密工业测量。

And draw the conclusion: It is feasible for the prefigurative deviation and error adjust used in PC rigid frame bridge construction control to use the calculation model and program brought forward in this papers.

通过与实际施工数据及测量结果作分析比较，得到结论：运用本论文的计算模型和程序对预应力混凝土连续刚构桥施工控制过程进行结构分析与误差调整是可行的。

The results indicate that the FDA method can be used to reduce the dimension effectively and extract the features based on the classification by fusing information in training data, the mine water inrush prediction model of FDA has excellent discriminant performance and the resubstitution error rate is very low.

研究结果表明：该模型利用回代估计法所得到的误判率小，并具有较强的判别能力。

In order to do research on pipe flow and pump characteristics of polymer flooding and water flooding rod-pumped well in especially high water-cut stage, rheometric test aimed at production stream from polymer flooding and water flooding rod-pumped well in especially high water-cut stage has been made, and the characteristic of production stream in especially high water-cut stage is confirmed as Newtonian fluid. Experiments using different mediums about pipe flow and pump characteristics is made. Frictional resistance and coefficient of friction resistance of annulus fluid between sucker rod and the pipe flow is calculated under different working conditions. Frictional resistance between plunger and pump barrel under different parameters is calculated based on related theory of pump characteristic and the strained analytical model of oil-well pump. Besides, using the theory of slit flow and hydraulic -clamping pressure, the frictional resistance is calculated, and the error between the result and measured value is no more than 13%.

为研究特高含水期水驱及聚驱抽油机井管流特性与泵特性，本文针对特高含水期水驱及聚驱井采出液进行了流变性试验，确定了特高含水期油井采出液的性质属牛顿流体；利用不同介质，进行管流特性与泵特性试验，得到了不同工况下杆、管环空流的摩擦阻力和摩阻系数；根据泵特性相关理论和抽油泵受力分析模型，计算了不同参数下柱塞与泵筒间的摩擦阻力，并利用缝隙流与液压卡紧力理论对柱塞与泵筒间的摩擦阻力进行了计算，计算结果与实测值误差在13%以内。

The solution process of these coefficients is formulated as a semidefinite programming,and hence the final model has the globally minimized fitting error.

为了使新延时模型的构造快速且准确，样条系数的求解过程被描述为一个半定规划问题，因此得到的新模型具有全局最小的拟合误差。

objective to optimize microwave extraction process of mannitol from sparganium stoloniferum.methodsguided by the contents of mannitol in sparganium stoloniferum, uniform design, response surface analysis and path analysis were used to optimize microwave extraction process by combining with single factor experiment.resultsobtained response surface equation is notable at the level a.01 and the relative error of the predicted value from the model was smaller than 1%.

目的优化三棱中甘露醇的微波辅助萃取工艺。方法以甘露醇含量为响应指标，通过均匀试验设计，采用二次响应曲面和通径分析并结合单因素实验优化三棱中甘露醇的微波辅助萃取工艺。

Based on the analysis of bistatic SAR geometry model, bistatic SAR echoed signal is modeled in the double range variables domain in this paper, and the relationship between the double range variable domain and the single range variable domain is established. Then a range-dependent Doppler algorithm for imaging processing airborne bistatic SAR raw data of the translationally invariant configuration is derived, and the effect of error of the algorithm is analyzed by simulating.

摘要该文通过对机载双基地SAR非移变几何模型的分析，建立了双距离变量域的回波信号模型，由于回波数据是在距离和域，该文推导了距离和变量与双距离变量的转换关系，解决了该模型向距离和变量域转换的问题；提出了适用于非移变模式的变多普勒参数的双基地RD算法，并对该算法中引入变多普勒斜率所存在的误差进行了仿真分析。

It is observed that the evaluation of sensory quality decrease with storage time and increasing temperature. It shows from the reliability assessment between predicted and observed shelf-life that relative error is within ±10% calculated by the prediction model for the shelf-life of Trichiurus haumela.

结果表明，鲜带鱼的总菌落数、总挥发性盐基氮、鲜度指标随着贮藏时间的延长而增加，且随着贮藏温度的升高而增加迅速，其感官品质指标随着贮藏时间的延长而下降，且随着贮藏温度的升高而下降迅速。

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。