超微气流粉碎技术的应用研究

超微气流粉碎技术因其耐热敏性、无污染和环境友好等特点在微纳米粉体领域有着广泛应用,并且随着超微气流粉碎设备的不断改进和研究的深入,其应用范围也在不断拓宽.概述了超微气流粉碎技术的基本原理及设备发展现状;介绍了超微气流粉碎技术在物理粉碎和化学研究尤其是化学改性和绿色合成化学中的应用研究;最后对超微气流粉碎技术的进一步应用研究做了展望.     

工程仿生应用与生物减粘脱附机理研究

工程仿生研究的目的是探索生物结构、功能或行为机理,建立工程原理模型,从而解决工程实际中的具体技术问题。土壤对地面机械触土部件的粘附严重影响机械的工作效率、工作质量、增大能耗,甚至使其无法作业,然而土壤动物却具有良好的体表防粘功能。本文对典型的土壤动物体表的非光滑表面进行特征描述,对其在工业、农业及其它领域的应用现状及前景进行了综述。     

基于刀具跳动的非可展直纹面侧铣加工刀位优化方法

在非可展直纹面的侧铣加工过程中,曲面的非可展的特性会影响加工后零件的表面质量。尤其在铣削软材料工件非可展直纹面时,刀具跳动是零件表面加工误差增大的新因素。针对这一问题,课题组提出了一种基于刀具跳动的非可展直纹面侧铣加工刀位优化方法。首先构建了刀具跳动下的误差度量函数;随后通过测量法得到了刀具跳动后的实际回转轮廓半径;最后在考虑刀具跳动的情况下通过单点摆动法对初始刀位进一步优化。仿真实验结果表明：在将刀具跳动因素加入非可展直纹面的误差优化模型中后,加工平均误差减小了25%,过切率减小了18.5%。该研究方法有效提高了零件的表面质量。     

道光年间成都将军治理四川彝地“边患”的历程及影响

清代中前期,清廷试在今四川大、小凉山地区的彝族聚居地实行改土归流,加强对该地区的统治。但改革流于形式,效果甚微。随着外来百姓不断迁入该地,人地生产矛盾愈发严重,导致该地屡有劫掠事件发生。至道光朝升级为几次大规模“边患”。成都将军作为彼时统领该地的最高军事长官,通过武力镇压和拟定章程等举措参与到“边患”事件治理中。但碍于清廷未能解决问题之根本,加之受制于国力的式微、武备的废弛、官员的贪污懈怠等内在因素,诸多举措看似合理,实则加深了当地“边患”,并带来一系列恶劣的后续影响。     

Response surface methodology in quality improvement

Recent work has lead to development of robust parameter design which alleviates criticisms of the Taguchi approach. A dual response surface approach is discussed and illustrated.     

On inspecting multiparameter likelihood surfaces

A computer-based graphical method for comparing a multi parameter log likelihood surface with its quadratic approximation is presented. The method can be used to visualize certain aspects of any highdimensional surface near a local maximum, Examples are given to illustrate the interpretation and use of the resulting plots.     

Description and evaluation of a nested cube experimental design

An incomplete factorial design based on an extension of the Fawiliar 2^kfactorial called a nested cube is proposed for use in response surface investigationso The simplicity and general efficiency of the nested cube suggest its suitability to many areas of research, especially that repeated at many locations orconductea over a long period. Comparisons to potentially competing designs are provided for bias in response estination due to fitting an ioappropriate model and for profiles of variance. merits of the nested cube are (1) a level of relative bias and variance judged to be favorable though not optimal, (2) an ability to utilize a minimum blag estimator not available to competing designs, and (3) a simplicity associated with use of equal spacing

and nearly equal replication on the margin for each factor level.     

Lag Order and Critical Values of the Augmented Dickey–Fuller Test

Response surface analysis is used to obtain approximate finite-sample critical values for the augmented Dickey–Fuller (ADF) test. Previous studies estimating the critical values for the test have generally ignored their possible dependence on the lag order. This study shows that the lag order, in addition to the sample size, can affect the finite-sample behavior of the test. The result points to the importance of correcting for the effect of lag order in applying the ADF test.     

An Application of Response Surface Methodology to the Atari® Miniature Golf Video Game

Response surface methodology is used to optimize a player's performance on the Atari® Miniature Golf computer video game. Because of the nature of the fitted response surface, a direct optimization procedure is used to estimate the optimum operating conditions.     

Augmented Box-Behnken Designs for Fitting Third-Order Response Surfaces

Box-Behnken designs are popular with experimenters who wish to estimate a second-order model, due to their having three levels, their simplicity and their high efficiency for the second-order model. However, there are situations in which the model is inadequate due to lack of fit caused by higher-order terms. These designs have little ability to estimate third-order terms. Using combinations of factorial points, axial points, and complementary design points, we augment these designs and develop catalogues of third-order designs for 3–12 factors. These augmented designs can be used to estimate the parameters of a third-order response surface model. Since the aim is to make the most of a situation in which the experiment was designed for an inadequate model, the designs are clearly suboptimal and not rotatable for the third-order model, but can still provide useful information.