查询词典 sampling distribution

For the diffractive optical element realizing beam shaping in the fractional Fourier transform domain,the transform matrix calculated by the discrete sampling points was compared with that calculated by the Fresnel integral,and the discretization error of the intensity distribution on the output plane was qualitatively obtained.

针对分数傅里叶变换衍射光学光束整形器件，比较了按离散点与按菲涅耳积分计算得到的变换矩阵间的差距，从中分析得出按离散点计算的变换矩阵引入的离散化误差与分数傅里叶变换系统参数的关系。

In order to study the near-surface permafrost distribution space, field survey and sampling method are used to study the issue.

为了研究近地表面多年冻土的空间分布规律，采用野外调查、取样方法对该问题进行研究。

In order to evaluate the uncovered gold-bearing structures, a new geochemical evaluation program, which consists of lengthwise sampling distribution and corresponding classification for data interpretation, is suggested.

为评价裸露含金构造，提出了一种新的地球化学评价方案，包括纵向采样布局和数据解释的对应分类法。

On the basis of the minimum scale soil nutrient distribution generated randomly based on the given values of mean, standard deviation and related distance, or obtained by geostatistics analysis based on soil sampling data, the amount of fertilization, yield and fertilization use efficiency at different scales were calculated by related fertilizer models and yield models supported by geographical information system and computer simulation, then the simulation result was intuitively visualized by curve graphics and RGB primitive colors synthesized image and thematic maps.

系统通过随机数生成法或地统计分析法生成最小尺度条件下的土壤养分空间分布数据，以此为基础，采用GIS、计算机模拟技术模拟不同尺度的养分空间分布，并以肥料效应模型和产量模型计算不同尺度条件下的施肥量、产量和肥料利用效率，最后通过曲线图、三原色合成影像和GIS专题图实现形象直观地表达模拟结果。

This paper integrated the experts' judgments with grids as the sampling strategy in an abandoned pesticide plant in northern China, and applied a geostatistical method, inverse distance weighted interpolation, to simulate the pollutants- and risk spatial distribution.

本文以北方某废弃农药厂为例，结合专家判定采样法与网格采样法，采用地统计学方法中的反距离加权空间插值法，分两种情形将大于土壤环境基准值的区域划定为治理范围。

For the one-dimensional case, the relation of the length of the element content distribution curve L to the sampling interval r is L =Cr1-1/H with the fractal dimension D=1/H.

对于地壳上任一给定区域，沿某一测线进行地球化学测量的任一元素含量数据，由上式确定的D值和H值，对于沿测线方向该元素的含量分布在统计的意义上将是确定的。

Base on the principle, the main circuit and control circuit of 2-phase hybrid stepping motor systems are designed. The system can realize many functions such as fix-frequency pulse width modulation, current sampling, power magnifying, ring distribution, producing control signal, and so on.

完成了对二相混合式步进电动机微步驱动系统主电路及控制电路的具体设计，实现了恒频斩波、信号检测、环形分配、微步信号的产生等功能，并搭制了实验电路进行实验验证。

This study was carried out in collective-owned summer grassland in Ganchaitan, which is located at the south foot of eastern Lenglongling Mountain (a branch of north Qilian Mountain), with yak and Tibetan sheep miscellaneously grazed on it. The grassland type could be classified as alpine meadow, dominated by Potentilla froticosa shrub. This study, under grads grazing stress, focused on the community structure, composition, species diversity, above-ground biomass of PFS, by using pane net sampling based on spatial distribution in stead of temporal succession. Results showed that: Grazing stress negatively related to the distance between grazing area and resident area.

以祁连山北支冷龙岭东段南麓的甘柴滩夏季牧场集体长期混合放牧的高寒金露梅Potentilla froticosa灌丛草场为对象，利用空间分布代替时间演替的方法，采用方格网法取样分析调查，对不同放牧压力梯度下金露梅灌丛群落的结构、组成、物种多样性、地上生物量进行研究，结果表明：①放牧居住点由远到近，放牧压力梯度不断增加，金露梅株高、密度、覆盖度、地上生物量和丛间草地的地上生物量均有不同程度的降低，地上的总生物量降低幅度达84.77%。

In order to investigate the tempo-spatial characteristics of negative air ions distribution in Guangzhou from September to November of 2008, we choosed typical plot to make scientific researches, which including the monthly variation of air negative ions, the influences of types of functional zones, sampling timeinterval and typical habitat on air negative charge ion concentration.

为研究广州市下半年空气负离子分布的时空特征，利用空气离子测量仪，在广州市选择典型的采集地，分析了广州下半年空气负离子的月际变化以及功能区类型、取样时段、典型环境对空气负离子浓度的影响。

The results showed that the aluminum plates had a much better effect than zinc plates in identifying crystalline free silica. The all open-faced samples had good uniformity in the filter no matter how many middles were used, but not so good for the closed-faced sampling. The calibration curve had a good correlation coefficient (r=0.995). Due to different industrial operating patterns, the distribution of crystalline free silica concentration varied by the industrial environment. The dust consisted of 10- 30% of crystalline free silica in all samples obtained from the foundry environments. The crystalline free silica was accounted for less than 10% in the respirable dusts.

结果显示，因为铝板对於结晶型游离二氧化矽具有较良好的补正系数，因此做为本研究的基底标准吸收校正的校正元素；SKC铝制旋风分离器搭配开匣式滤纸匣於一阶中环、二阶中环、三阶中环均有良好之均匀度，反之，搭配闭匣式滤纸匣其均匀度均不佳；分析检量线具有良好线性关系(r=0.995)，因作业型态不同，作业环境会有不同的浓度分布，综观作业环境中可呼吸性结晶型游离二氧化矽之含量均小於10%以下，总粉尘结晶型游离二氧化矽之含量约为10 – 30%之中。

"Second Life is remarkably easy to work with, and is very popular,"

"第二次生命是显着容易的工作，并且很受欢迎，"

For example, we usually assume that materials are homogeneous and isotropic and free of internal defects or flaws.

为了得到适合有限元分析的模型，我们必须经过如图2所示的简化步骤。