We also performed a nonlinear curve fitting to the intensity relation curve between pumped light and upconversion emission light , and knew that the upconversion luminescence belonged to three - photon absorption 通过对上转换发光强度与泵浦源电流强度关系曲线的拟合，看到这种上转换是三光子吸收过程，这与通过能级图分析得到的结果相同。
The macromodel is built up with the combination of device simulation and nonlinear curve fit , which makes the extraction of the substrate parasitic parameters more convenient and the circuit simulation more accurate 该宏模型通过器件模拟与非线性拟合相结合的方法建立，使衬底寄生参数的提取更加方便，同时保障了深亚微米电路特性的模拟精度。
Only clouds of points instead of grids are distributed over the computational domain and the spatial derivatives of the considered partial equations are estimated using a least - square curve fit on local clouds of points 与传统的网格方法不同，无网格方法的核心是用“点云”离散求解区域，并基于当地点云离散结构，引入二次极小曲面逼近空间导数。
The dot model and polynomial mapping , wavelet transform and gauss curve fitting have been applied to stars image procession , and experiments have been performed on a simulating system platform and get satisfied results 本文分别将点阵模板及多项式映射、小波变换、高斯曲面拟合等方法应用于星图底层处理，并进行半物理仿真实验，取得了良好的实验结果。
Based on the threshold idea of threshold regression model , the threshold factors and threshold values are introduced and determined by the correlation analysis method of best curve fitted in conventional regression model 借鉴门限自回归模型的门限思想，在常规回归模型中引入门限因子和门限值，利用提出的最佳拟合相关分析法确定门限因子和门限值，建立了门限回归模型。
The information extending method and curve fitting method , which deals with data in the complementary system of wams and scada , are discussed . secondly , traditional transient stability analysis method starts at the static 传统暂态稳定分析方法是从故障前稳定平衡点开始的,然而实际系统总是处在或大或小的扰动之中,因此,这种分析方法不能准确地表现系统真实的运行情况。
2 . doppler frequency shifting and curve fitting differential methods for measuring velocity are analyzed and compared . the least - squares curve fitting methods based on power functions and orthogonal functions are analyzed and compared 2 .对测量速度的两种方法,多普勒频移法和曲线拟合微分法作了分析和比较;对以幂函数族和以正交函数族为基底的最小二乘曲线拟合法作了对比分析。
