变化系数

I also discuss the potential effect of time-varying skewness and kurtosis on the performance of the model.

我也探讨了随时间变化的偏态系数与峰态系数对此模型表现之潜在的影响。

The results showed that with increasing the oil flow rates, both of skewness and kurtosis increased firstly, and then decreased.

研究发现随油相折算速度的增大，偏度系数和峰度系数均表现出了先增大，而后逐渐减小的变化规律。

Finally, based on the optimized configurations,the lift coefficients, drag coefficients and lift-drag ratios were calculated with hundreds of in-flow Mach numbers and angle of attacks.Some interesting phenomena occured and were depicted.

最后，针对得到的优化外形，计算了不同来流马赫数和攻角下的流场并分析了升力系数、阻力系数以及升阻比随马赫数和攻角变化趋势，得到了一些有趣的规律。

The mean activity coefficients of Li_2SO_4 and Li_2B_4O_7 for Li_2SO_4- Li_2B_4O_7-H_2O system at 298.15K and for Li2SO4-H2O and U2B4O7-H2O at 273.15K respectively were calculated using Pitzer model and the results reveal the rules of the mean activity coefficients of U2SO4 and U2B4O7 in the mixing solutions changing with the ion strengths and the molality fractions.

本文以化学计量形式计算获得的Pitzer离子相互作用参数，计算了273.15K下Li_2SO_4、Li_2B_4O_7在纯盐体系和298.15K下Li_2SO_4、Li_2B_4O_7在Li_2SO_4-Li_2B_4O_7-H_2O体系中的平均活度系数，揭示了Li_2SO_4、Li_2B_4O_7的平均活度系数随离子强度及不同yb值的变化规律。

As a calculation example, the sheet reduction ratio and the distance from the neutral plane to inner boundary are calculated and compared with published data. A fairly good agreement is obtained between the calculated results and the experimental data.

作为算例，得到了理想刚塑性材料的板料厚度、变薄系数以及应变中性层内移系数随板料弯曲内表面曲率半径变化的规律，并与实验数据进行了比较，两者吻合良好。

As a case in point, the sheet reduction ratio and the distance from the neutral plane to inner boundary are calculated in comparison with published data. A fairly good agreement is obtained between the calculated results and the experimental data.

作为算例，得到了理想刚塑性、线性强化刚塑性材料的板料厚度、变薄系数以及应变中性层内移系数随板料弯曲内表面半径变化的规律，并与实验数据进行了比较，两者吻合良好。

Combining with the National Natural Science Foundation ofChina(No.50478032), following researches were done in this thesis: 1 The variation regularity of the ultimate anti-bending capacity of therectangular-sectioned beam with different corrosion has been obtained through thequalitative analysis of 48 beams (32 corroded beams and 12 comparing beams) withaccelerated corrosion; 2 The conclusion has been obtained that the strain of corroded steel bar andconcrete no longer fit in with the assumption of plane section through the analysis ofthe strain data, the strain relation of steel bar and concrete in the mid-span section ofvariously corroded beams at ultimate has been obtained. Through the building of newgeometric relation, the expression of the height of compressive area in the corrodedbeam with rectangular section has been deduced, and the formula with corrosion rateas the main variable for the anti-bending capacity of the corroded concrete beam hasbeen suggested and verified by experiment.; 3 The influence of steel bar corrosion and the concrete regression to the flexureductility coefficient of the corroded structure component has been analyzed. Based onthe relation of steel bar and concrete at yield and ultimate, the expression for theflexure at yield and ultimate of corroded reinforced concrete beam, and the model forthe calculation of the flexure ductility has been built.

本文结合国家自然科学基金项目(50478032)"既有钢筋混凝土桥梁时变可靠度研究"，主要进行了以下研究工作： 1通过对48根快速锈蚀钢筋混凝土矩形截面梁(32根锈蚀梁和12根对比试验梁)数据的定性分析，得到了不同锈蚀率下，锈蚀钢筋混凝土矩形截面梁极限抗弯承载力的变化规律； 2通过对应变数据的分析，论证了锈蚀构件钢筋和混凝土的应变不再符合平截面假定的结论，并通过回归分析得出了不同锈蚀率的螺纹钢筋梁和光圆钢筋梁在极限弯矩作用下，跨中截面处钢筋应变和钢筋处混凝土应变的关系，通过构造新的几何关系，得出了锈蚀钢筋混凝土矩形截面梁计算受压区高度的表达式，既而得出了以锈蚀率为主要变量的锈蚀钢筋混凝土矩形截面梁的正截面抗弯计算建议公式，并通过试验数据加以验证； 3分析了钢筋锈蚀和混凝土劣化对锈蚀构件曲率延性系数的影响，结合钢筋屈服和极限弯矩两种状态下钢筋和混凝土的应变关系，分别得到了锈蚀钢筋混凝土矩形截面梁屈服曲率和极限曲率的计算表达式；既而推导出曲率延性系数的计算模型。

Aiming at the problem of the plateau firing table compilation, the expression of two-variable function of projectile drag coefficient varying with the mach number and altitude above sea level is presented in this paper.

针对高原射表编制问题，提出了随马赫数与海拔高度变化的弹丸阻力系数二元函数表达式和利用雷达测速曲线中提取阻力系数二元函数的方法。

The results showed that length from flag leaf pulvinus to spike base has the largest coefficient of variance of 42.1% and 37.2% in both DS and WW environments, respectively, while the spikelet per spike has the smallest CV of 6.4% and 5.7%. Under different water regimes, spike number per plant, effective spikelet per spike and peduncle length contribute a lot to the stable grain yield. Genetic diversity indices of DTI were from 1.95 to 2.07, with an average value of 2.02. Based on the DTI of agronomic traits, all accessions could be clustered into seven groups, the first and third groups are not sensitive to the water regimes, and the second group is more suitable for planting in dryland.

结果表明：在雨养和灌溉条件下，穗叶距的变异系数最高，分别为42.1%和37.2%，单穗总小穗数的变异系数最低，为6.4%和5.7%；不同水分条件下，植株稳产性主要受单株穗数、有效小穗数及穗下节长的影响；性状耐旱指数的多样性指数在1.95到2.07之间变化，平均值为2.02；根据性状耐旱指数将供试材料分为7个类群，其中第I、第III类群材料表现为对水分条件不敏感，而第II类群材料更适于在干旱条件下种植。

The free volume cell theory was applied to derivative the formula of activity coefficients of liquid binary solution at arbitrary temperature. The Monte Carlo algorithm was employed to calculate the non-liner equations, then the free volume parameters were directly correlated to the activity coefficients of liquid binary, ternary, quaternary and quinary solutions at arbitrary temperature. The three dimensional diagrams of a-x-T diagrams representing the changes of activity with those of temperature and concentration were plotted.

由自由体积胞腔理论推证了某温度下两组分的活度系数关联式；引入MonteCarlo非线性方程解法，通过无限稀释溶液的实验活度系数数据直接得到自由体积参数和二元系及多元系液态金属溶液在任意温度下全浓度范围内的活度数据，构筑了直观反映活度随温度和浓度变化的a-x-T三维图形。

But we don't care about Battlegrounds.

但我们并不在乎沙场中的显露。

Ah! don't mention it, the butcher's shop is a horror.

啊！不用提了。提到肉，真是糟透了。