基于广义马尔科夫链模型的动柔度预测

动柔度对机械加工的稳定性和精度有重要的影响。对动柔度进行预测能为机床加工精度补偿和稳定性分析提供实际的指导作用。由于不确定性的存在会降低结果的可靠性与可信度,传统的马尔科夫链预测方法没有考虑不确定性问题。为了提高预测结果的可靠性与可信度,在马尔科夫链模型的基础上提出了一个广义马尔科夫链模型,并通过广义马尔科夫链模型对动柔度进行了预测。结果表明：提出的预测方法有一个好的预测性能。     

Vibration monitoring of high speed spindles using spectral analysis techniques

A significant source of noise and vibration in precision high speed machine tool spindles is bearing induced vibration, which is caused by inherent geometrical characteristics, as well as out-of-balance assembly and interactions between rolling mating members with surface irregularities. The multitude of causes often makes a diagnostic approach quite arduous, particularly due to insufficient information obtained from frequency domain analysis alone. Furthermore, the averaging nature of Fourier analysis and its poor frequency resolution make the task in complex vibration spectra more difficult. The paper presents a new approach in use of auto-correlation analysis with good frequency resolution, combined with windowing capability to isolate significant causes for subsequent remedial actions. The method is applied to a routing spindle with special reference to primary induced bearing frequencies.     

机器人装配作业主被动复合柔顺的CMAC系统

文章研制了一维搜索手腕,提出了一种称为"一维搜索"的机器人装配作业主被动复合柔顺策略,将主动搜索自由度降低到一维,同时最大限度的利用被动柔顺.设计了以装配力信号为输入的小脑模型神经网络,建立了机器人复合柔顺装配作业的CMAC系统,收到良好的装配效果.     

快堆装载机支臂结构的动静态性能拓扑优化设计方法

摘要：针对快堆装载机支臂结构的动静态性能和轻量化设计要求,采用有限元法验证了原结构的安全性,提出了一种基于变密度法固体各向同性惩罚微结构（SIMP）,通过引入标准化系数建立起将多工况刚度和动态多个低阶关键固有频率归一为组合柔度指数最小的动静态多目标拓扑优化数学模型,并得到了合理的整体Pareto解。分析结果表明,根据拓扑优化结果改进设计的支臂动态性能明显提高,在安全停堆（SSE）工况下最大Tresca应力减小约10%,结构重量减轻约21.5%,较好地达到了既提高性能又减轻重量的结构优化目标。     

The Impact of the Recovery in the Uncertainty Evaluation of the Oil and Grease by Extraction and Gravimetry in Produced Waters Derived From the Petroleum Extraction Process

It is a current practice for chemical analysts to use recovery in their analysis, but seldom, this source of uncertainty is evaluated. Thus, this topic takes the authors out of the comfort zone. Although recovery, in some situations, can be negligible, not always its source of uncertainty can be not. The authors discuss the uncertainty contribution of the recovery using an example the oil and grease by extraction and gravimetry in produced waters derived from petroleum extraction process. The results show that the uncertainty of the recovery can be the greatest source. It can be mainly observed when certified reference materials to evaluate the recovery have high uncertainties. Even when the recovery does not need to be computed, based on statistical tests, the relevance of the recovery, as an uncertainty source, cannot be negligible, deciding if oil and grease content meets the legal regulation.     

乌苏市地表水质量评价

本文分析了新疆塔城地区乌苏市地表水水质状况。通过河流水质资料从矿化度、总硬度、高锰酸盐指数、五日生化需氧量、挥发酚等参数分析反应其变化趋势,分析其水质现状。从而判定乌苏地表水是否符合国家《地表水环境质量标准》(GB3838-2002)的Ⅲ类标准,是否可以满足生活、工业用水、农田灌概以及渔业养殖等多种用途的水质要求。结果表明,新疆塔城地区乌苏市地表水水质现状为Ⅰ―Ⅲ类,符合国家《地表水环境质量标准》(GB3838-2002)的Ⅲ类标准。     

Predicting compliance of children with and without developmental delay.

Noncompliance is a common problem exhibited by children with developmental delay (DD; Walker, 1993). The authors evaluated whether performance on the Assessment of Basic Learning Abilities (ABLA) test would predict compliance of children with and without DD to instructions alone (IA) versus instructions with modelling and/or gestures (IMG) administered by their caregivers. The ABLA test uses standard prompting and reinforcement procedures to assess the ease or difficulty with which a testee is able to learn a simple imitation and five two-choice discriminations. Twenty-one children without DD and 16 children with DD were presented with five age-appropriate educational tasks by their respective caregivers in a structured teaching session that included IA on some trials and IMG on others. The ABLA test performance reliably predicted the compliance of the children in the two conditions, and the results were consistent across both groups. The results are important for providing information to caregivers on how best to instruct their children in an effort to increase compliance. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

论水泥浆流动度试验方法及应用

论述了GB8077水泥浆流动度试验方法存在的问题及改善措施;外加剂质量控制中应用水泥浆流动度试验的注意事项;水泥浆流动度试验判断外加剂与水泥适应性的可行性及局限性.     

Reading in graduate school: A survey of doctoral students in clinical psychology.

To what extent do graduate students in clinical psychology complete assigned readings? A total of 744 graduate students in American Psychological Association-accredited doctoral programs completed an online survey regarding reading in graduate school (67% response rate, of those viewing the survey). The reported amount of assigned reading varied widely, with an average of 330 pages per week. Compliance ratings suggested that about half the assigned reading is completed thoroughly and that thorough reading is more common than skimming or not reading assigned material. Motivating and hindering factors for reading are reported, and implications for faculty are considered. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

运输类飞机运行符合性验证规划方法研究

针对民航当局对运输类飞机运行符合性的评审要求,结合型号研制里程碑节点和飞机设计、制造、试验的不同状态,确定了不同阶段的运行符合性验证工作内容,提出了将运行符合性验证与型号合格审定进行协同规划的方法,提出了与研制、审定过程协调一致的运行符合性验证计划编制方法,构建了基于验证项目、验证资源、验证成本、验证时间等多参数的运行...