均差

The results showed that the upper section of the profile contains more coarse fractions and loessic fractions, with the presence of gravels, showing vertical changes in grain size. All of these suggested that the upper section is loessic material deposited by water.

研究结果表明：凤凰山剖面上部含有砾石，粗粒组分含量较高，且垂向变化均较大，分选性较差，但同时颗粒组成仍以风成沉积的两个主要粒级为主，为经流水作用改造的次生黄土。

By fitting the models of semivariogram of them and analyzing the patterns, it was found that the nugget range of macropterous SBPH and larval SBPH were approaching to that of spiders, as well as the range of structural intensity, but the nuggets of SBPH were not approaching to that of spiders, neither the structural intensity. The spatial pattern of larval SBPH and spiders were aggregation, but that of macropterous SBPH was random sometimes.

通过变差函数模型的拟合及空间格局的分析，得出灰飞虱长翅成虫、若虫与蜘蛛的变程范围相近，结构性强度的范围相近，但同一时间灰飞虱与蜘蛛的变程和结构性强度则均不尽相同；灰飞虱若虫与蜘蛛自始至终为聚集分布，但灰飞虱长翅成虫与蜘蛛的分布型则有差异，在某些时间为均匀分布。

Flotation of the three pure sulfide minerals (named amesonite, marmatite and pyrrhppite) used different regeants, is discussed as to know how the useful part is separated from the ore. The flotation behavior of the three minerals is that in low pH value they have good buoyancy,while in high pH value they have bad buoyancy.

以大厂92号矿石中的脆硫锑铅矿、铁闪锌矿、磁黄铁矿为主要研究对象，研究它们在不同药剂条件下的浮选行为，基本查明了三种矿物浮选行为：在酸性条件下，三种矿物均有较好的可浮性；在强碱性介质中，三种矿物的可浮性都变差。

According Mazur scale for ankle joint,the result of the treatment was evaluated as excellent in 21 patients;good in 12 patients;fair in 8 patients and poor in 5 patients.

结果 所有患者术后均获得8～48个月的随访，平均20个月。踝关节功能按Mazur评价，优21 例，良12 例，可8 例，差5 例。

No entire nitrendipine crystals were observed visually in SEM photos. The results of X-ray diffraction and differential scanning calorimetry analysis indicated that the crystalline form of nitrendipine was highly dispersed in microspheres, so as amorphous state. The drug release rate of microspheres could be controlled with adjusting the ratio of solid dispersion carriers and retarding agents formulated. The agitation speed and temperature of the preparation process have distinct effect on micromeritic properties of microspheres. The release profiles of the microspheres were mainly affected by the stirring rate of paddle, the concentration of SDS and pH of dissolution medium. Cooling speed and time, however, have no evident influence on the drug release rate of the microspheres. The dissolution data showed that the mechanism of drug release from microsphers was mainly diffusion-controlled. The incorporation efficiencies of 3 batches sample were exceed 96. 8％, which implied that the current method was suitable for design sustained-release dosage form for poorly water-soluble drug.

在扫描电子显微镜下观察，在微球内外未发现尼群地平的完整结晶，X-射线粉末衍射和差示扫描量热试验结果也显示，尼群地平已经被高度分散在微球中；微球的释药速度可通过调整处方中固体分散体载体和阻滞剂的比例控制；制备温度和搅拌速度对微球的质量影响较大；溶出仪的搅拌速度，释放介质的浓度和pH对微球的释放有较大的影响；制备过程中的冷却速度和冷却时间对微球的释放行为影响不很明显；方程拟合的结果表明缓释微球的释药行为符合扩散机制；测定三批微球样品的包封率均在96.8％以上，表明该法适合于制备难溶性药物的缓释微球。

The classical principal component analysis is one of the most effective feature extraction methods. PCA essentially gives the optimal representation in a minimum of mean square sense, so it is usually used to minify the dimension of high dimensional image pattern modes.

传统的主分量分析方法是最为经典的图像特征抽取方法之一，由于其本质上是在最小均方差意义下给出了模式样本的最优表示，所以它通常被作为对高维图像模式进行降维的一种常用方法。

The analytical results have shown that p ro ducts mainly consisted of some monosubstituted, disubstituted and a few trisub stituted naphthalenes. Except the low activity of HZSM-5 catalyst, all other z eolite catalysts have higher activity. HY and Hβ catalytic activities were the highest, and their naphthalene conversions attained to 79.12 and 55.79 percent respectively, but their selectivities for 2-isopropylnaphthalene, 2,6-diisopropylnaphthalene(2,6-DIPN) and 2,7-diisopropylnaphthalene ( 2,7-DIPN) were too low. ZM catalysts had good activity and much better selecti vity, especially for ZM4-3, of which its 2,6-DIPN/2,7-DIPN ratio was 2.97. Th er efore, some zeolite catalysts are recommended for shape selective isopropylat ion of coal tar naphthalene.

研究结果表明，煤焦油萘异丙基化产物主要由一取代萘、二取代萘以及少量三取代萘组成；除HZSM-5活性较低以外，其它催化剂均有较高的反应活性，其中HY和Hβ反应活性最高，萘转化率分别达75.15％和55.96％，但β位产物的选择性较差；ZM类催化剂既有一定的活性，又有较高的β选择性，是萘择形异丙基化反应理想的备选催化剂。

By the odd variance analysis to the average of AEMG, MPF and slope of MPF in the preliminary 20 seconds, we find that the falling slopes of MPF of the left multifidus muscle and the right multifidus muscle are remarkably influenced by driving time, not so other muscles.

通过对前20秒的AEMG、MPF的均数以及MPF的斜率进行单因素方差分析，左、右侧多裂肌前20秒sEMG信号特征指标MPF的下降斜率受驾驶时间影响显著，而其它肌肉的影响不明显。

The VLBW group had a significantly lower birth weight and smaller head circumference than the full term controls at the age of 5. Compared to the control group children, the performances of the VLBW group were inferior in terms of intelligence, neuromotor skills, visual perceptual skills, and adaptive behaviors.

研究结果发现5岁VLBW早产儿的体重与头围明显比对照组儿童小；在神经动作，视知觉、认知以及行为适应能力均明显比足月正常对照组儿童差，活动量则无显著差异。

The results calculated by the Elovich rate equation showed that K release rates from 1 mol.L-1 HNO3 extraction ＞those from 2 mol.L-1 HNO3 extraction ＞those from H-resin extraction. Elovich equations combining with the data of H-resin and 2 mol.L-1 HNO3 successive extraction could well described the release characteristics of soil K. The correlation coefficients of the equations reached most significant levels (r＝0.956**—0.999**), and standard errors of specific K release capacities between the vaules calculated by the equations and those measured by both successive extractions were smaller(s=1.61 and 3.52). The specific release rates of soil K calculated by the Elovich rate equations were significantly correlated with the indices of soil K availability (the amounts of easily available K, nonexchangeable K, total available K in soils and K absorbed by ryegrass).

研究结果表明：1 mol.L-1 HNO3提取法的释K速率＞2 mol.L-1 HNO3提取法的释K速率＞氢饱和交换树脂提取法的释K速率；氢质交换树脂和2 mol.L-1 HNO3提取法结合Elovich模型较理想地描述了土壤K素的释放特性，拟合方程的相关系数均达极显著水平(r＝0.956**-0.999**)，土壤特征累积释K量的计算值与实测值的标准差较小(s=1.61和3.52)，且通过速率方程计算的土壤特征释K速率与K素有效性指标(速效K、缓效 K、有效K及黑麦草总吸K量)的相关性也较为密切。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐