A Six-sigma approach for benchmarking of RP&M processes

This paper presents a methodology of using six-sigma quality tools for benchmarking of rapid prototyping & manufacturing (RP&M) processes. It involves the fabrication of a geometric benchmark part and a methodology to control and identify the best performance of the process to reduce the variablity in the fabricated parts. The approach is demonstrated with a case study based on the direct laser sintering (DLS) process for prototyping using plastic powder. In the case study an identified set of six-sigma/ statistical process control tools is employed to determine and best tune factors affecting the desired outcomes of the built parts.     

基于激光干涉仪的数控机床运动误差识别与补偿

提出了数控机床运动误差的软件补偿方法。采用刚体运动假设和齐次坐标变换建立了多轴机床空间运动误差的通用模型。该模型把刀具相对于工件的空间误差表示为机床各结构件之间运动误差的位置函数。给出了全部运动误差参数的激光干扰仪识别方法，提出了一种新的roll误差测量措施，在立式加工中心上进行了运动误差的补偿实验，结果证明所提出的运动误差软件联动补偿效果显著。     

并联机床动态特性研究的理论与实际意义

针对并联机床的研究现状 ,从刚体动力学、弹性体动力学、加工过程稳定性、加工精度等方面综述了并联机床动态特性研究的理论与实际意义 ,明确了并联机床在工程应用中亟待解决的关键技术问题     

增广递推最小二乘辨识精度的研究

以带有有色噪声的CARMA模型为例,分析了在干扰项参数辨识当中,误差较大的原因以及影响辨识误差的因素,并利用二次辨识的思想提出了一种提高辨识精度的方法。通过此方法并结合一个具体实例,给出了Matlab仿真辨识的结果。仿真结果表明,经过二次辨识的参数更接近真实值。     

双闭环复合控制在轮胎硫化机中的应用

以硫化过程为研究对象,提出了一种分别控制扰动和系统参数变化的新型复合控制方法,并用遗传算法对控制参数进行了优化。通过对其在Matlab/Simulink中进行仿真,与模型参考自适应控制相比较,结果表明该控制方案具有更优良的鲁棒性和可靠性,控制方案简单且可实现在线整定,便于在轮胎企业推广应用。     

低压智能断路器中的单片机系统电磁兼容分析

介绍了低压智能断路器中的单片机系统电磁兼容的试验项目和电磁干扰对断路器单片机系统的主要影响,分析了切换瞬态过程的各种类型瞬变骚扰源的抗干扰能力,静电放电抗干扰能力及单片机硬件、软件抗干扰能力,并提出抗干扰解决措施。设计系统软、硬件时,只有二者兼顾,相互结合、补充才能达到较好的抗干扰效果。     

高压三电平变频器的滤波升压系统中能量过渡过程研究

从不同时间尺度上对高压三电平变频器的滤波升压系统进行数学建模，在秒级的时间尺度上主要研究该负载在不同负载稳态运行时的滤波情况，在毫秒级的时间尺度上主要研究故障时从变频切到工频时的电机过渡过程，从微秒级的尺度上研究了负载切换时缓冲吸收电路的能量过渡过程。同时由于变频器向该系统注入了大量的高频分量，为此建立了变压器高频分布模型，以评估变压器分布电容对全系统的影响。实验结果表明了模型和分析方法的有效性。     

多边形的分类及判别方法

基于多边形边方向的唯一性,提出了一种允许边重叠、交叉的平面多边形的分类方法,即平面任意多边形分为单纯多边形和奇异多边形两种,拓展了平面多边形的研究领域.在此基础上通过引入多边形点的矢性数的概念,给出了一种单纯多边形的判断方法,为实现笔画字体的轮廓化提供了新的解决途径.     

洛钼集团选矿二公司八年以来的成功技改

介绍了洛钼集团近年来主要的技术革新和成功的设备改造,在洛钼集团发展壮大的过程中离不开各项技术的支持,技术创新是企业发展的生命力。     

Rebuttal re: "Confirmatory bias and the persistent influence of discredited data in interpreting the stress-cancer link: Commentary on Michael et al. (2009)".

[Correction Notice: An erratum for this article was reported in Vol 30(4) of Health Psychology (see record 2011-13978-001). The letter was missing the doi. The correct doi is 10.1037/a0022737. The online version of this article has been corrected.] Responds to the comments by J. C. Coyne and C. Johansen (see record 2011-09497-016) on the current author's original article, "Influence of stressors on breast cancer incidence in the Women's Health Initiative" (see record 2009-03297-001). Coyne and Johansen (2011) took issue with the study conducted by the current authors' group (Michael et al., 2009), which analyzed the interaction between stressful life events and social support on breast cancer risk among 83,334 postmenopausal women enrolled in the Women’s Health Initiative (WHI). While the current authors agree with the Coyne and Johansen that too often null results are difficult to publish due to confirmatory bias that privileges results that support an alternative hypothesis, they strongly disagree with the assertion that their group selectively reported findings, inaccurately reported findings, or provided selective and uncritical reference to the existing literature. (PsycINFO Database Record (c) 2011 APA, all rights reserved)