查询词典 forward difference operator

The topics to be covered in the course are Integration and Economics Applications, Linear, First-Order Difference Equations, Nonlinear First-Order Difference Equations, Linear Second-Order Difference Equations, Linear First-Order Differential Equations, Nonlinear First-Order Differential Equations, Linear Second-Order Differential Equations, Simultaneous Systems of Differential and Difference Equations, and Optimal Control Theory.

讲授内容包括积分与经济的应用、线性一阶差分方程式、非线性一阶差分方程式、线性二阶差分方程式、线性一阶微分方程式、非线性一阶微分方程式、线性二阶微分方程式、差分与微分的联立方程式、最适控制理论。

In this thesis, the resonance fluorescence spectra of a A-type three-level atom is calculated, which is driven by two bichromatic fields having the same difference of the frequency. In addition, the influence of the relative phase difference on the fluorescence spectra are considered. It is found that the fluorescence spectra of the atom are deeply depend on the relative difference and the appearance and cancellation of the fluorescence are obtained by changing the relative phase difference.

文中以具有相同频差的两个双色场驱动下的三能级Λ型原子为模型，计算了其共振荧光谱，考虑了两个双色场的相对相位差对谱线的影响，结果表明：原子的荧光谱强烈地依赖于驱动场的相对相位差，可以利用相对相位差的改变对荧光的产生和抑制加以操纵。

Economy of article base oneself upon grows dialytic interest difference, think, the interest difference with the result reasonable; that interest difference is economic progress is the main impetus that economy grows, unreasonable interest difference can become economic progress and even the major obstacle that the society develops.

本文立足经济发展透析利益差别，认为，利益差别是经济发展的结果；合理的利益差别是经济发展的重要推动力，不合理的利益差别则会成为经济发展乃至社会发展的重大障碍。

Result There was no significant difference to the number and length of parenchyma cell in the uppermost internode between Shuangdi Pei eS and Shuangdi S in meiosis and dikaryon pollen stages;there was significant difference to those in tikaryon pollen stage, and there was very significant difference to those in anthesis and the 7th day after anthesis,and on the 7th day after anthesis,the difference to the number and length of parenchyma cell in the uppermost internode between Shuangdi Pei eS and Shuangdi S was the greatest.

长穗颈双低培eS与双低S穗颈节间薄壁细胞数及细胞平均长度在减数分裂期和二核花粉期差异不明显，于三核花粉期差异达显著水平，始花当天和始花后第7天均达极显著水平，其中始花后第7天时两者的差异最大。

Results:Biochemical indicators: the concentrations of K+, Na+ and Cl－ in the serum after the infusion are different with those before the infusion; other indicators don't have the significant difference. The mean infusion time of group A is longer than that of group B (p=0.006), while the dosis letalis of KCl doesn't have significant difference between groups (p=0.062); the concentrations of K+ in blood, Na+, Mg2+ and Cl－ in serum have the significant difference between groups; the urine volume and the concentrations of all the urine electrolyte indicators don't have the statistical significant difference between groups.

结果：生化指标：输入钾前后，家兔血清钾离子浓度升高，钠、钙及氯离子浓度降低，具有统计学显著性差异，p=0.000；全血钾及血清其他离子浓度变化，以p=0.05为标准，不具有统计学显著性差异。A、B两组间比较结果：A组输液致死时间长于B组(p=0.006)，致死输钾量无统计学显著性差异(p=0.062)；全血钾、血清钠、镁及氯离子浓度变化值具有显著差异，血清钾、钙、碳酸氢根离子浓度变化值无明显的差异；尿量和尿液各电解质浓度指标无统计学显著性差异。

Results At the dosage of 25 mg/kg,AN could induce higher incidence of fetal resorption and death,and decrease the average fetal body weight and le ngth with significant difference(P＜0.05)when compared with neg ative controls.At the dosage of 35 mg/kg,AN could decrease average vital fet us p er litter with significant difference(P＜0.05),and induce chang es of other indexes with highly significant difference(P＜0.0 1).At the dosage of 25 and 35 mg/kg,AN could induce higher teras rate,maternal t eras rate and malformation rate of vital fetus with significant and/or highly s ignificant difference(P＜0.05 or P＜0.01),resp ectively.There existed a dose-effect or dose-response relationship between abo ve indexes and doses.

结果 25 mg·kg-1组死胎率、吸收胎率升高，胎鼠平均体重、体长、尾长减小，与阴性对照组比较差异有显著性(P＜0.05)；35 mg·kg-1组除窝平均活胎数减少，差异有显著性( P＜0.05)，其余各指标与阴性对照组比较差异有非常显著性(P ＜0.01)；25，35 mg·kg-1组畸胎率、母体畸胎率、活胎畸形率升高，与对照组相比差异有显著性和/或非常显著性(P＜0.05或P ＜0.01)，且有明确的剂量效应或剂量反应关系。

First, calculates the fast moving average (usually 12 days) and slow moving average (usually 26 days) by exponential calculation method; second, make fast line value minus slow line value to gain the difference of relative distance. In order to make the trend signals more clear and less influence exerted by of excessive price fluctuation, the difference should be smoothly calculated (general elect 9 days) to get average of difference value. Chart the difference and its average in a coordinate with time for horizontal axis and MACD for vertical axis. Then we can apply the identical, contrary or cross signals through observing their direction, relative and absolute positions.

它首先以指数平滑计算法计算出快速移动平均线（一般选12日）慢速移动平均线（一般选26日），再以快速线数值减慢速线数值即得到快慢线相对距离的差离值，为使趋势信号更明显并且不受股价过分波动的影响，对差离值也进行平滑计算（一般选9日），得到差离值的平均值，把差离值和差离平均值画在以时间为横轴，以MACD为纵轴的坐标上，通过观察差离值和差离平均值的方向、绝对位置和相对位置关系，把它们的同向、异向和交叉现象作为买卖信号的提示。

The difference between goose down and duck down and the difference between wool and down were compared. Their difference in morphological structure as well as the resultant difference in property were elucidated.

比较鹅绒与鸭绒在形态上存在的差别，并与同类的蛋白质纤维－羊毛进行对比，阐述二者结构上的差异以及由此产生的性能上的差异。

The X line that the method collects 75 patients is smooth piece reach CT piece, observe cervical vertebra thorn respectively dash forward, horizontal dash forward even the line, extensive region - tine joint clearance, dentate dash forward with spine dash forward the change of bisector.

方法收集75名患者的X线平片及CT片，分别观察颈椎棘突、横突的连线，寰-齿关节间隙，齿状突和棘突平分线的变化。

This article detailedly expatiated upon the principles, contents and methods of cropland classification; it analyzed the necessity to combine the work of cropland classification with GIS technology, summarized the attributions of ARC/INFOand some other related softwares; it established the technologic route of cropland classification supported by GIS, by a case study in Liwu Town,Li County Hebei Province, this article expatiated the practicable mechanism of combining the function of ARC/INFO with the work of cropland classification, and put forward some new ideas and approaches of utilizing GIS: this paper put forward the idea of coding the polygons in the basic graphic database such as soil map and land use map according to their attributes, and put forward the detailed coding project; based on the code databases, it expatiated upon the detailed approaches to create single梖actor map and output the final classification map; it put forward the principles and the method of creating classification units in the environment of GIS, that is how to keep the lines of soil polygon, the border of districts and the important objects such as residential areas, banks of rivers and roads ,and how to overlap single梖actor soil map and land use map, and to delete some vector lines of the overlapped map appropriately; it detailed the methods of creating mathematic model of classification coefficients in the environment of computer, and used FOXPRO6.0 programs to realize the automation of calculating coefficients; it represented the method of plotting the final map by overlapping various coverages according to the code tables and lookup tables, the process of outputting the cropland classifying map was finished by program.

本文法对耕地等别划分的原则、内容及方法作了较详细的阐述，介绍了多系数综合修正法的耕地等别计算方法及其具体应用和AHP的确权方法；分析了耕地等别划分工作与地理信息系统技术相结合的必要性，简要介绍了地理信息系统软件ARC／INFO及其他相关软件的功能特点，制定了地理信息系统支持下耕地等别划分的技术路线，通过对河北省蠡县蠡吾镇的实证研究，重点阐述了ARC／INFO及相关数据库软件与耕地等别划分结合的有效机制及GIS应用的一些新思想、新方法：提山了对土壤图和土地利用现状图等基础图形数据库进行特征编码的思想和具体的编码方案，阐述了基于与图形库相链接的特征编码表，单因素图提取、成果图的输出的具体实现方法；提出了GIS环境下耕地单元划分的原则和方法，即在保留土壤因素图斑界线、行政界线和重要地物等的原则下，将土壤单因素图和土地利用现状图进行拓扑叠加，对叠加图中的矢量线进行适当的删除；阐述了在计算机环境下，耕地分等参数计算模型建立的方法，并用FOXPRO6.0语言程序实现了参数计算的自动化；阐述了根据图形库特征编码表和建立绘图符号查找表，按不同图层叠加绘制成果图的方法，该过程用命令程序实现耕地等别图的输出。

Molecular Distillation is a kind of high vacuum distillation method, which is suitable for the separation of high boiling, heat sensitivity and viscidity products.

分子蒸馏技术是一种在高真空条件下进行的连续蒸馏过程，适合于分离高沸点、热敏性及具有生物活性的混合物。

They are to the Noughties what yuppies were to the Eighties .

那在六十年代是时髦的，但在八十年代肯定是过时了