正则分布

The generalized central limit theorem shows that these heavy-tailed fluctuations accumulate to a stable probability distribution.

如果尾不是太厚，则方差是有限的，且我们可以找到常见的正态极限分布，即稳定分布一种特殊情况。

The results showed that the grain yield of winter wheat with two-irrigation was higher than that with one-irrigation with the same nitrogen application rate and method. Compared to one-irrigation,the grain number per spike in two-irrigation was higher,the 1000-grain weight was lower, the water wastage was higher, but the WUE was lower. The yield was not affected significantly by nitrogen rates and the methods. Within the nitrogen rate of 157.5-295.5kg/hm2, the lower NUPE and Nitrogen Productivity declined with nitrogen rate increasing. NHI was not lower than the others at the lowest nitrogen rate of 157.5kg/hm2. The accumulation of NO3--N in soil was significantly and positively correlated with the nitrogen application rate. NO3--N in one-irrigation was distributed mainly in the top layer (0-80cm), but it was inverse in two-irrigation.

结果表明，施氮量和施氮方式相同时春浇二水冬小麦的产量高于春浇一水，二水穗粒数较一水高，千粒重则低于一水，一水耗水量较少，水分利用效率明显高于二水；同一水分下不同施肥量及施肥方式对产量的影响差异不显著，同一施肥方式下在157.5-295.5kg/hm2范围内，施肥量越大，氮素生理效率和氮肥生产力越低，施氮157.5kg/hm2时，氮收获指数均处在最高或较高水平；土壤硝态氮残留量与施氮量呈显著正相关，成熟期一水条件下土壤中硝态氮主要集中在上层(0~80cm)，二水条件下则主要分布在中下层。

Then, the fronts .of different intensities are superposed on the orographic disturbances and pushed by basic geostrophic flow to climb over the orography.

通过非静力模式讨论了两维地形扰动与锋面的相互作用，研究了不同基本气流，包括正压、斜压、层结强弱差异，不同尺度的地形，包括不同高度和不同宽度，强弱不同的锋面等多种情况下地形扰动与锋面扰动的相互影响，发现地形尺度和气流的性质不同带来的结果是有差异的，中尺度地形使冷锋在迎风坡锋消，在背风坡则是锋生和锋消相间的波状分布，表现为锋面在山顶附近锋生、快速下坡过程中锋消和山脚处锋生的分布特征，这与半地转模式中地形的动力作用使冷锋在背风侧单纯加强是不同的。

The effects of solvents and salts on the formation of a third liquid phase, distribution of catalyst, reaction mechanism and reaction rate in the reaction between n-butyl bromide and sodium phenolate with tetrabutylammonium bromide as a phase transfer catalyst were investigated.

中文摘要本文系针对以溴化四丁基铵为相间转移触媒催化正溴丁烷与酚化钠之反应，研究溶剂种类及盐类与碱类之添加量对形成第三液相、触媒分布、反应机构及反应速率之影响，被测试之溶剂包括氯苯、甲苯与正己烷，而在盐类与碱类效应的研究中，则测试溴化钠与氢氧化钠。

This paper gives the distribution of the Peynolds stresses, which shows that the flow near the wall at the exit is obviously nonisotropic and the maximal turbulence intensity is enough high to impact on the matching of the intake and the engine. The unsteady characteristics of the flow evince that the flow doesn't separate obviously.

出口截面上雷诺应力分布表明：该进气道出口流场主流方向的紊流强度较大，最大值已达8%以上，这给进／发匹配造成影响；正雷诺应力和剪切应力沿径向和周向的分布特点则说明进气道出口核心流区域流动基本是各向同性的，然而在近壁区却表现为明显的各向异性。

For the first time the Tikhonov s regularizing method is used to solve the failure rate of the products of electrical engineering when their failure distribution is unknown.

当电工产品的失效分布类型未知时，首次利用求解不适定问题的正则化方法来求解其失效率。

However, the trends of both improvement and degradation in eco-environment were coexist, and displayed their spatial hete...

与城市用地变化有关的土地利用类型也多分布在金昌、嘉峪关、张掖、武威和酒泉 5个地级市所在地区，表明这些区域的城市化过程相对活跃；3城市用地变化对生态环境影响的空间规律表现为：使生态环境原本较差的地区生态环境质量有所增加，而使生态环境质量较好的地区生态环境质量降低；4城镇用地与工矿用地对区域生态环境的影响表现出与城市用地总体基本一致的规律，但农村居民点则对生态环境正、负两方面影响都较为显著；5 城市用地扩展对区域生态环境的影响也体现出与城市用地总体类似的区域分异特征；而城市用地收缩的影响则与此趋势相反。

The heat transfer problem in a belieal tube wall is solved using the pertubationmethod. The zeroth-,the first-and the second-order analytic solutions are obtained of temperaturedistribution inside the wall and the heat resistance is calculated.

采用正则摄动法求解了螺旋管壁热传导问题，获得了管壁温度分布的零阶、一阶和二阶的分析解表达式，计算了热阻。

The sample BRDF curves variating with the scatter angle under several incident angles are given, and some of the curves were selected and sent into the artificial neural network. The network was trained with the Bayesian regularizing method. The mapping relation model of BRDF with incident and scatter angles was obtained.

给出测量样品多个入射角度下的BRDF随散射角变化的曲线，从中选取部分曲线输入到神经网络，使用贝叶斯正则化方法训练网络，最终获取双向反射分布函数和入射角、散射角的映射关系模型。

Front-peak dominated double peak mode and double peak group mode were mainly found in the rain-particle samples, while the front-peaked dominated double peak group mode is mainly found in the rain-particle samples ofdry-season, and double peak group mode is mainly found in the rain-particle samples of wet-season.

正构烷烃分布模式呈现一定季节变化，干季雨水主要为单峰态模式分布，而平台型模式主要出现在春季的雨水中，夏季雨水则三种模式都有；干季雨水颗粒物主要为双峰态前峰型模式，而湿季则以要双峰态双峰型模式为主。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。