共查询到20条相似文献，搜索用时 125 毫秒
1.
闫玉梅秦建彭瑞潭冒兴建 《南通职业大学学报》2015,(1):72-74
建立和优化中药正柴胡饮颗粒一步制粒的工艺路线和工艺参数。采用单因素考察法,以颗粒成品率为评价指标,对药液相对密度、进风温度、雾化压力、喷雾速率等工艺参数进行考察。研究表明,药液相对密度为1.15,进风温度为90℃,雾化压力0.4 MPa,喷雾速率为2.0 L/min条件下,制得颗粒成品率较高,形态较好;用一步制粒法制备正柴胡饮颗粒,工艺参数稳定,值得在生产中应用。 相似文献
2.
对于农业研究中多变量线性模型参数的估计,以往常采用经典统计方法。随着计算机技术的进步,贝叶斯统计方法在科学研究的各个领域迅速发展。文章利用贝叶斯统计方法对农业研究中的多变量模型进行参数估计,并与经典统计方法进行比较,验证了贝叶斯方法的有效性。该方法可为农业研究中多变量模型参数的估计提供新的途径和手段。 相似文献
3.
刘芸 《贵州教育学院学报》2013,29(3)
主要介绍了假设检验中的各种参数信息,包括显著性水平α的最佳选择方法,Z检验统计量及相关参数,单总体t检验统计量参数和卡方检验的统计量参数,P值检验的参数.对每个参数的意义做了简要的讨论,对使用假设检验解决问题提供一定的理论指导. 相似文献
4.
5.
对于回归方程参数的估计,常采用经典统计方法。近年来,伴随着计算机技术的快速发展,贝叶斯统计获得了广泛应用。本文利用贝叶斯统计对非线性回归方程Y=aX^b＋ε进行参数估计,并进行了实例演示,验证了该方法的有效性。 相似文献
6.
7.
8.
本文依据非参数统计方法,给出了定时截尾寿命试验时,产品下一个失效时间的实用区间估计。对单参数指数分布,分别使用了两种方法进行讨论,并对两种方法的预测结果进行比较。 相似文献
9.
程晓亮 《鞍山师范学院学报》2017,19(4)
基于鞍山统计年鉴提供的数据,运用非参数统计中关于位置参数的检验方法,对鞍山地区的主要经济指标进行统计分析以及相应的检验.通过两种检验方法的检验结果,预测出最近几年鞍山地区经济发展的趋势,为鞍山地区经济发展提供相应的理论依据. 相似文献
10.
利用R统计软件的绘图和随机模拟功能,对矩估计和极大似然估计的统计性能、矩估计不惟一时矩的阶数选择以及用参数法和非参数法进行置信区间估计的异同点等进行直观描述,揭示方法的区别,以促进方法的理解和正确应用。 相似文献
11.
The Bézier curve is one of the most commonly used parametric curves in CAGD and Computer Graphics and has many portant problem, and is also an important research issue in CAD/CAM and NC technology fields. This work investigates the curves to satisfy the given constraints and modify the shape of the curves optimally. Practical examples are also given. 相似文献
12.
陈源 《衡阳师范学院学报》2005,26(3):7-9
本文研究了含参数最优化问题解的通有唯一性。针对目标函数空间，采用了函数的上方图形拓扑，在目标函数仅仅关于第一变元下半连续的条件下，我们得出含参数最优化问题的解具有通有唯一性。 相似文献
13.
采用水平集方法描述结构的拓扑及其变化,使用紧支径向基函数对计算区域的水平集进行插值以得到参数化的水平集方法。针对给定体积约束下结构最小柔度的拓扑优化问题,推导了目标函数对插值系数的灵敏度及拓扑优化的迭代格式,数值计算表明,使用该方法进行结构拓扑优化得到的结果边界形状光滑连续且计算稳定性较好。 相似文献
14.
15.
DING You-dong LI Min HUA Xuan-ji School of Computer Engineering Shanghai University Shanghai . China Department of Mathematics. Fudan University Shanghai China 《上海大学学报(英文版)》2000,(Z1)
1 IntroductionThe generation method of curves and s~es is oneof main research areas in computer aided geometncdesign (CAOD) and computer graphics (CG) AS weknow, the cable and surface have tWo types ofrepresentations p~c and lmpllclt Now theparametnc curve and surface are widely used in the curveand surface generation systems because they have msnyadvantages such as computing simply, d1SPlaye-cped-lently' suforlslon prop~s etc But for somecomp-floated shop such as the closed one, the Para… 相似文献
16.
Using a hypothetical data set, the authors provide concrete examples to illustrate that canonical correlation analysis is a general linear model, subsuming other parametric procedures as special cases. Specific statistical techniques included in the analysis are t tests, Pearson correlation, multiple regression, ANOVA, MANOVA, and discriminant analysis. The discussion is aided by an initial explanation of the logic of canonical analysis. Further, similarities between the canonical technique and other univariate and multivariate procedures are highlighted. The treatment is intended to reiterate a framework in which statistical concepts can be presented to students. 相似文献
17.
一类二层多目标规划的解法 总被引：3，自引：0，他引：3
在上层决策变量作为参数的情况下 ,将上层为单目标 ,下层为线性多目标的两层优化问题 ,转化为含参变量的有效集上的单目标问题 ,给出了一个相应的算法 相似文献
18.
Anthony D. Albano 《Journal of Educational Measurement》2015,52(1):55-69
Research on equating with small samples has shown that methods with stronger assumptions and fewer statistical estimates can lead to decreased error in the estimated equating function. This article introduces a new approach to linear observed‐score equating, one which provides flexible control over how form difficulty is assumed versus estimated to change across the score scale. A general linear method is presented as an extension of traditional linear methods. The general method is then compared to other linear and nonlinear methods in terms of accuracy in estimating a criterion equating function. Results from two parametric bootstrapping studies based on real data demonstrate the usefulness of the general linear method. 相似文献
19.
Powerful computational procedures are now available to better determine the accuracy of statistical estimates derived from data that have unknown distributions or do not meet parametric requirements. These techniques are generally called resampling plans and include the recently developed bootstrap. Science educators often face the problem of nonnormal distributions especially when conducting large-scale assessments or evaluating national curriculum projects that require complex sampling plans. Resampling techniques permit the researcher to make inferences without the strong distributional assumptions needed for more traditional parametric approaches. In this study, the bootstrap and a simplified version of a half-sample replication are used to examine the precision of science test scores obtained in a large-scale evaluation of Scope, Sequence, and Coordination, a national science curriculum project. The resampling plans are described in some detail and the results are compared with those obtained from parametric methods. © 1998 John Wiley & Sons, Inc. J Res Sci Teach 35: 697–704, 1998. 相似文献
20.
Spherical parametrization of genus-zero meshes by minimizing discrete harmonic energy 总被引：1，自引：0，他引：1
LI Ying YANG Zhou-wang DENG Jian-song 《浙江大学学报(A卷英文版)》2006,7(9):1589-1595
INTRODUCTION Parametrization is an important problem in Computer Graphics. A parametrization of a polygonal mesh in 3D space can be viewed as a one-to-one mapping from the given mesh to a suitable domain which is also a mesh. Typically, if the mesh is simple, the used domain is a connected region on the plane (Desbrun et al., 2002; Eck et al., 1995; Floater, 1997; 2003; Sheffer and Sturler, 2000); and if the mesh is with genus-zero, the used domain is a unit sphere (Gotsman et al., 200… 相似文献