查询词典 sampling distribution

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。

The distribution of gas-solid two-phase flow in the axial guide vane cyclone tube was measured with five-orifice pitot tube and by means of isokinetic sampling method.

为研究颗粒分离机理，提高分离性能，采用五孔球探针测试仪及等动采样法对轴流导叶式旋风管内气固两相流速度与压力分布进行了测量，并分别对不同导流锥和排尘结构参数下的纯气流流场及颗粒浓度场分布进行了对比分析。

Within methods of this class, tracking is solved by sequential building posterior probability distribution of target state, and sampling based Monte Carlo computing acts as one of the key technologies.

这类方法通过序贯构造目标状态的后验概率分布来求解跟踪问题，而基于抽样的蒙特卡罗计算方法则是其中关键的统计计算技术。

Content includes probability, statistical distribution, sampling, estimation, hypothesis testing, regression, multiple regression, and random process.

主要内容包括：概率、统计分布、抽样、估计，假设检验、回归、多元回归和随机过程等。

The content includes: sources, collection and tabulation of data, description of characteristic of data distribution, probability, sampling method, regression and correlation, hypothesis testing, time series and index number.

主要内容包括：统计数据的收集与整理，数据分布特征的描述，抽样的基本理论与方法，相关分析与回归分析，假设检验的基本理论与方法，时间数列分析，统计指数。

The quadrat sampling technique is mostly used in plant ecology to study the distribution and abundance of species in plant communities.

其内部的生物体被标记，样方抽样技术多用于植物生态学领域，用来研究某一植物群落中物种的分布及其含量的多少。

This study was conducted in Taiyuan sewage irrigation area from 1997 to 2000.The research process included field investigation, sampling, lab test, model experiment and data analysis by geo-statistics method. The source, affecting factors, content condition, transference regularity, spatial distribution of heavy metal in sewage irrigation area were studied. The results showed that mercury, cadmium and lead contents of soil were higher than soil background value.

本文以在中国北方具有代表性的太原污水灌溉区为研究对象，污灌区位于山西省中部的太原盆地北端，总面积2.7万公顷，在研究区共布土样点49个，粮食作物样33个，水样点26个，大气样点6个，通过实地调查取样监测和室内模拟试验，采用地统计学和多元统计等方法，系统研究了污灌区土壤-作物系统中重金属Hg、Cd、Pb的来源、含量状况、累积影响因素、空间分布特征、迁移转化规律、重金属环境容量的区域分异与应用等内容。

Even-aged stands of Robinia pseudoacacia on slope lands facing south and north were selected as sampling plots for root distribution investigation.

本研究选择阳坡和阴坡不同立地上年龄一致的刺槐林调查了根系分布特征。

By the time of its fall, most of the prisoners were writers who had written against the corruptions of the government.

到它被攻陷的时候，里面多数的犯人是写了反对政府贪污文章的作家。

The most obvious variation to ovum morphological character was that the color was changed from light green to sepiaceous in embryonic development, and all the ovums were almost hatched after 96h.

在胚胎发育过程中卵的形态特征最明显的变化是颜色从淡绿到深褐色，卵在发育96h后卵基本全部孵化。