应用型本科机械设计制造及自动化专业人才培养方案研究

本文针对应用型本科机械设计制造及其自动化专业如何培养当今社会急缺的高技能复合型人才问题作了探索与研究,提出了新的课程体系与培养方案。     

试论股份合作制在基层农机服务 组织中的推行与完善

近年来为适应农村经济发展的需要 ,我国农机服务组织推行股份合作制的步伐日益加快。但是在股份合作制改造过程中也出现了一些问题 ,如改制不规范 ,政府职能部门的协调和服务功能不配套 ,产权关系不明晰等等。文章对存在的问题及问题产生的原因进行了剖析 ,并提出了解决问题的相应对策     

积极开发生态童装 提升中国制造童装国际竞争力

随着人们健康意识及环保意识的不断增强,健康、安全的生态童装日益受到关注。为避免出口童装被通报召回等贸易摩擦事件的发生,我国童装生产企业应结合相关国际童装安全标准,对童装进行科学设计并选用绿色环保的面料及辅料,以促进生态童装的研发以及提升中国制造的童装在国际市场的竞争力。     

Epistemic modesty,ostentatiousness and the uncertainties of epigenetics: on the knowledge machinery of (social) science

Epigenetic processes are garnering attention in the social sciences, where some scholars assert their importance for theorizing social life. I engage with such ideas here by drawing on interviews with leading bioscientists. To begin with, I underscore the (productive) uncertainties of those working in and around epigenetics; I describe these as a manifestation of ‘epistemic modesty’, and suggest that dissensus helps to propel biomedical innovation. Then, drawing on the concept of ‘alien science’, I detail some researchers’ ambivalences regarding the notion of ‘transgenerational inheritance’; their dissatisfaction with the (public) communication practices of other scientists (situated in what I term a regime of ‘epistemic ostentatiousness’); and the challenges faced when moderating societal discussion of epigenetics in ways that expand excitement whilst deflating (what researchers regard as) unrealistic expectations. The paper concludes with reflections on the knowledge machinery of the (social) sciences, and employs the study data to interrogate sociological engagements with epigenetics.     

纸机传动控制系统的配置与控制原理

针对纸机日益高速化、大型化的发展趋势，设计了国内先进的全数字化通信网络传动控制系统。系统采用西门子全集成自动化解决方案，实现造纸生产过程的全线集成控制。高可靠的工业现场总线PROFIBUS—DP和工业以太网相结合的网络结构，有效地实现了数据共享，全面解决了整个工艺过程的控制。文章详细介绍了控制系统的配置和功能，重点阐述了速度链、负荷分配控制、张力控制等主要控制原理。     

Improved Approximation for Breakpoint Graph Decomposition and Sorting by Reversals

Sorting by Reversals (SBR) is one of the most widely studied models of genome rearrangements in computational molecular biology. At present, is the best known approximation ratio achievable in polynomial time for SBR. A very closely related problem, called Breakpoint Graph Decomposition (BGD), calls for a largest collection of edge disjoint cycles in a suitably-defined graph. It has been shown that for almost all instances SBR is equivalent to BGD, in the sense that any solution of the latter corresponds to a solution of the former having the same value. In this paper, we show how to improve the approximation ratio achievable in polynomial time for BGD, from the previously known to for any > 0. Combined with the results in (Caprara, Journal of Combinatorial Optimization, vol. 3, pp. 149–182, 1999b), this yields the same approximation guarantee for n! – O((n – 5)!) out of the n! instances of SBR on permutations with n elements. Our result uses the best known approximation algorithms for Stable Set on graphs with maximum degree 4 as well as for Set Packing where the maximum size of a set is 6. Any improvement in the ratio achieved by these approximation algorithms will yield an automatic improvement of our result.     

压铆机械机体截面的优化设计

本文采用最优化方法对“Ｃ”形压铆机械机体截面进行了优化分析，并根据优化结果对原机体截面形状加以改进，最后给出了用于改进后截面的计算公式。     

神经网络在高速超精轴系故障诊断中的应用

讨论了ＢＰ神经网络神经元开关函数饱和参数的选择问题，建立了ＢＰ神经网络的容错能力、全局性能与收敛速率之间的关系，并提出了一个如何应用这些关系来合理选择神经元开关函数饱和参数的方法模拟试验研究和分析结果表明，本文提出的合理选择神经元开关函数的方法可以有效地帮助ＢＰ神经网络技术解决诊断中复杂的模式分类问题。     

基于“PRP”的“精密机械设计”课程设计的改革

为了适应高校课程体系改革的需要,针对基于产品实现过程的改革思想,文章提出对测控技术与仪器专业"精密机械设计"课程设计的选题内容及设计要点进行改革,使得课程设计能够与工程实际结合得更紧密,从而提高学生的创新能力,有利于高校的人才培养.     

民国时期苏锡常地区新式排灌机械发展及原因探析

民国时期,以石油引擎和电动机为动力的新式排灌机械在苏锡常地区被广泛引进并使用,使农业生产力显著提高,生产效率几倍甚至是上百倍地提高,是我国农具发展的重要事件。民国时期排灌机械的发展与苏锡常地区的自然和社会条件密切关系,苏锡常地区平坦而多水的地理条件、充沛的降水量、发达的经济实力、较高的物价水平、快速发展的电力等是排灌机械成功得以发展的主要原因。