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reduction error
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  “reduction error”译为未确定词的双语例句
     The aim is to find a reduced-order 2-D regular Roesser model for a given 2-DSRM such that the associated model reduction error meets a prescribed Hx norm bound constraint.
     (2) 研究了不确定2-D奇异系统Roesser模型鲁棒H_∞控制问题。
短句来源
     The modal vector reduction, error localization and model updating methods are approached.
     进而研究了模态向量减缩、误差定位和模型修改等问题。
短句来源
     Besides, it also gets the estimation of the degree reduction error bound.
     其次,给出了降阶误差界的估计.
短句来源
     Also considered is the case of the original curve and the degree reduction curve when they are continuous on(r,s) degree respectively on two end points(r≥0,s≥0). Besides, the estimation of the degree reduction error bound is presented. Finally,a numerical example is given.
     该方法还考虑了原曲线与降阶曲线在两端点处分别达到(r,s)阶连续的情形(r≥0,s≥0),给出了降阶误差界的估计及数值例子。
短句来源
     Proposes a new kind of data reduction method based on the thinking o f second-scan ,get the relationship between reduction error and parameter of ar ithmetic, presents the flowchart of it finally.
     最后提出了一种新的基于激光二次扫描思想的数据简化算法,得出了点云数据的简化误差与算法中各参数之间的关系,给出了算法的流程图并对算法进行了实现。
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  相似匹配句对
     Final Error in the Oxidant Reduction Titration
     氧化还原滴定法的终点误差
短句来源
     METHOD OF REDUCTION OF BEZIER CURVES AND COMPUTED ERROR
     Bezier曲线的降阶及误差计算方法
短句来源
     On reduction strategy
     浅谈化归策略
短句来源
     Error and uncertainty
     误差与不确定度
短句来源
     ON HUMAN ERROR
     论人的失误
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  reduction error
The proposed Microscale Reduction Error (MRE) estimators and indicators are based on estimating the uniform validity properties of the double scale asymptotic expansion.
      
Microscale reduction error indicators and estimators for a periodic heterogeneous medium
      
To get a reasonably low-order compensator, frequency-weighted reduced-order models are exploited, with the reduction error treated as an uncertainty.
      
The second way is to construct the adjacency graph by using the given reduction error directly and performing the graph reduction just once.
      
The reduction error represents the relative error introduced in the graph reduction.
      
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The purpose of this paper is to find an accurate and reliable reduction method for the synchro-reduction domain including nine to fifteen virtual height data above the minimal appreciable frequency fmin. For this domain three higher ionization mo-dels with two variables are given, whereas six or eight lower ionization models with two variables are given for the ionization below fmin. At most twenty different reduc-tion results may be obtained for each h'-f curve by the least square method. It is...

The purpose of this paper is to find an accurate and reliable reduction method for the synchro-reduction domain including nine to fifteen virtual height data above the minimal appreciable frequency fmin. For this domain three higher ionization mo-dels with two variables are given, whereas six or eight lower ionization models with two variables are given for the ionization below fmin. At most twenty different reduc-tion results may be obtained for each h'-f curve by the least square method. It is possible to select an accurate result from the above calculations. 468 theoretical noc-turnal h'-f curves have been reduced. They possess different shapes, critical fre-quencies fc, semi-thicknesses H and fmin's, and these theoretical virtual heights have an accuracy of about 0.1 km. The maximal reduction errors of 462 h'-f curves are less than 5 km, whereas those of 6 curves are between 5-9 km.

本方法的关键在于建立对最小可见频率f_(min)以上包括九至十五个视高h′数据的同步换算范围进行精确可靠的换算方法。对同步换算范围给出三个各包含二个未知数的高层模式,对f_(min)以下给出六或八个各包含二个未知数的低层模式。按照最小二乘法对每一条频高曲线最多可以得到二十个各不相同的换算结果。通过一定的方法可以从中挑选出精确的结果。对468条其形状、临界频率f_c、半厚H以及f_(min)各不相同的其精度为0.1公里左右的理论夜间频高曲线进行了换算。其中462条曲线的极大换算误差不超过5公里,6条曲线介于5公里至9公里之间。

he average annual temperature and annual precipitation were reconstructed for past 116 years(1874~ 1990)under the nonlinear response function of Pinus massoniana to climate by the metheds of dendrochronology.The effect of reconstructed temperature was better than that of the precipitation,the reduction errors(RE) and percentage average of residuals for temperature and precipitation were 0.12,0.10,2.3%and 20%respectively. The reconstruction could be verified by the observed data and other historical records...

he average annual temperature and annual precipitation were reconstructed for past 116 years(1874~ 1990)under the nonlinear response function of Pinus massoniana to climate by the metheds of dendrochronology.The effect of reconstructed temperature was better than that of the precipitation,the reduction errors(RE) and percentage average of residuals for temperature and precipitation were 0.12,0.10,2.3%and 20%respectively. The reconstruction could be verified by the observed data and other historical records for most years,while in the several years with higher temperature and precipitation,the residuals between estimated and observed values too large to be accepted.

利用树木年轮气候学方法,根据马尾松生长对气候变量具非线性响应,尝试重建江苏暖湿地区过去116年(1874~1990)的年平均气温和降水量。温度的重建效果优于降水量,实测值与重建值两者的缩减误差(RE)分别为0.12和0.10,两者的平均偏差百分率分别为2.3%和20%。绝大部分重建结果可从观测记录和历史文献中得到验证,但在温度较高或降水量较多的若干年份,实测值与重建值有较大偏差。

Tree--ring data were sampled from the north slope of Changbai Mountain, Northeast China. Three spedes from five sites growing along altitudinal gradient were coiled. For each site the tree cores were cross--dated using skeleton plot and measured to the nearest 0.01 mm using standard techniques. The dating and measurement were validated using an improved version of the COFECHA program. Final chronologies were developed using the program ARSTND. The age trend of trees was modeled by a cubic spline. Using a bi--weight...

Tree--ring data were sampled from the north slope of Changbai Mountain, Northeast China. Three spedes from five sites growing along altitudinal gradient were coiled. For each site the tree cores were cross--dated using skeleton plot and measured to the nearest 0.01 mm using standard techniques. The dating and measurement were validated using an improved version of the COFECHA program. Final chronologies were developed using the program ARSTND. The age trend of trees was modeled by a cubic spline. Using a bi--weight robust mean method, de--trend indias were averaged to form standard chronologies (STD). To minimize the variations that reflect competitive interactions between trees, further standardization was done by fitting an autoregression model to the de--trend index and residual chronologies (RES) were calculated using the same average method.Common interval analysis indicates that RES chronologies are with more common yearto --year variations and express more population signal. Therefore, RES chronologies are suitable for dendroclimatic research in this study. Comparisons of climatic quality among five RES chronologies indicate that trees growing near their upper elevational hot are more suitable for dendroclimatic study than those growing at the upper elevational limit and at the center of the distribution. Climatic data for Tianchi, Antu and Changbai meteorological stations were employed and four climatic elements, monthly mean minimum temperatUre, monthly mean temperature, monthly mean maximum temperature and monthly total precipitation, were involved in this study. All data were tested for homogeneity.Response function, correlation function, scatter diagram and single--year analysis were utilized to stUdy the response of tree radial growth to climatic elements. The results showed that ma studied were mainly affected by climatic elements. From 63% to 78% percent of growth variance can be accounted for by monthly mean air temperature and monthly total precipitation. And the response to temperature is stronger than to precipitation. While,for three temperature elements, the response to monthly mean maximum temperature is the strongest, especially, in winter and spring seasons. As a result, monthly mean maximum temperature was selected to reconstruct.Multiple linear regression analyses were used to perform calibration analysis.Regression equations were developed by regressing monthly mean maximum temperature for various combinations of blocks of month against ring-width data from all sites. To reconstruct a seasonal series of climate, January to April was selected as the reconstructing season, and an average record of January to April mean maximum temperature was formed from the three stations providing a regional record. This regional record allows to reconstruct past climate of Changbai Mountain.Regressions were calculated between January ~ April mean maximum temperature and ring --width data for various combinations of tree- ring sites. Band on the equation statistics such as the percentage of variance expressed by the equation, two regression equations were selected, one is for reconstruction before 1833, and the other for after. house a chrOnology from ANPK site was included in the second equation, the statistics of the equation were improved. The stability of there two equations was tested by cross--validation procedure using verification statistics including sign test, product mean and reduction error. All of these statistics indicated that the selected equations were of the predicative capability,and that they can be used as the transfer functions.According to the transfer functions, January ~ April mean maximum temperatures of Changbai Mountain were reconstructed year by year, and the reconstruction was smoothed by applying a resistant smoother. It was found that the reconstructed low--frequency variations were more reliable than the year--to--year variations. Therefore, only the low--frequency variations were discussed. From the 339 years' low--frequency variations, it was found that the departures oscill

本文以树轮气候学中常用的树轮宽指数资料作为过去气候的代用资料,重建了长白山区1655年以来1~4月月平均最高气温的变化。重建中的校准方程稳定性较好,并可解释重建变量方差的57.4%。在1833年以来重建可靠性较高的时段中,1974~1979年为低温期,1951~1963年为高温期。而结束于1861和结束于1897年的两个高温期持续时间最长。本文的研究结果展示了利用树轮资料重建我国长白山区过去气候变化的巨大潜力。

 
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