有限磁场下等离子体填充的波纹波导中波传播理论

给出了有限磁场下波在等离子体填充的波纹波导中传播的分析理论。推导出作为普遍严格公式的场分量的弗洛奎展式、本征值表达式以及色散方程。在某些特定情况下，详细讨论了波传输功率和耦合系数，这对于波纹结构的进一步研究非常有用。同时给出了初步的数值计算。其结果表明外加磁场的场强对波传播的色散特性有很大的影响从而影响了这类器件的性能。     

Effect of avian predation on survival of leaf-rolling lepidopterous larvae

Manipulative field experiments were performed in a northern Japanese deciduous forest to determine the role of avian predation in the survival of three leaf-rolling lepidopterous larvae (Homonopsis foedenratana, Archips viola, and Zeiraphera corpulentana) on Japanese lilac (Syringa reticulata) trees. When all leaf rolls on the lilacs were experimentally removed, the visitation rate of birds declined, indicating that the leaf rolls served as a visual cue for the birds. In a second experiment in which birds were excluded from the lilac trees, the survival of H. foedenratana larvae was improved, whereas the mortality of the other two Lepidoptera stayed the same. This is probably the result of differences in the shape of leaf rolls; larvae of H. foedenratana alter the leaf form to a greater extent, which may facilitate the detection of the rolls by birds. The high predation rate on the tight leaf rolls of H. foedenratana may be offset by enhanced resistance against other predators and better food quality for the enclosed larvae. Received: January 30, 1998 / Accepted: December 2, 1998     

木罗拉在国产仿罗併上应用的改进

本文通过麻纺工艺实践,就木罗拉在国产仿罗併上应用中出现的问题进行 了技术总结,提出了改进措施,取得了满意的效果.     

基于Pro/E软件的传水机构特性分析及优化设计

水墨平衡是保证胶印印刷质量的关键。借助Pro/E软件,建立传水机构的三维模型,然后对传水机构的动态性能进行了系统的分析,并根据分析结果,对印刷机墙板结构进行了优化,从而为印刷机的传水辊设计和改进提供了一定的借鉴。     

Discursive manoeuvres and hegemonic recuperations in New Zealand documentary representations of domestic violence

This article examines the production and promotion of A&;E's Rollergirls (2006), a US docu-soap featuring the Texas Roller Derby Lonestar Rollergirls (TXRD), the league that revived roller derby as a sport for female amateurs. Focusing on the representation of TXRD skaters in Rollergirls, as well as A&;E's promotional campaign for the series, this analysis is contextualized in relation to the role of female athleticism in contemporary US commercial culture. Relying on practices long used to trivialize women sports figures, Rollergirls' portrayals of TXRD skaters suggest ambivalence towards female athleticism as well as a desire to contain the gender-bent and sexually agential performances at the heart of women's roller derby. In addition to revealing the challenges television producers face in the representation of female athletes and other nonconformist women, the research offered here hopes to expand feminist television criticism beyond its conventional focus on fictional texts while also broadening feminist studies of sports media, which have centered primarily on news coverage.     

3600/40矿棉板成型机设计

矿棉板已成为公共建筑吊顶材料的首选,但其关键设备成型机还主要依靠进口。自主开发的3600/40矿棉板成 型机,采取湿法长网抄取成型,多点伺服电气控制,配有高浓网前箱、针形辊、上真空辊、蒸气喷洒、印花辊等先进装置,料 板厚度自动可调,具有产量大,易操作,适应低容重和高矿棉两种配方工艺,具有能耗低、质量稳定、节水等优点,可完全 替代进口。     

单头螺旋槽管凝结换热实验研究

本文对垂直布置的单头螺旋槽管在凝结条件下的传热和阻力特性进行了实验研究。得出了具有一定精度和适用范围的管内对流换热及阻力特性关联式，并应用量纲分析方法得出了管外凝结换热的准则方程式。     

新型同轴慢波结构特性的研究

为了克服因增加返波管功率容量而引起的模式竞争问题,提出了波纹内导体同轴慢波结构,导出了该结构在冷腔时的TM0n模式色散方程,并数值计算和分析了该结构的色散特性。分析结果表明:采用该结构的返波管能够很好地改善模式竞争。     

镀铝瓦楞纸板商业化应用探讨

本着绿色设计低碳生产和经济的可持续发展理念,探讨真空镀铝磁控溅射镀膜理论及其技术方法制备镀铝瓦楞纸板。从而获得绿色环保的镀铝瓦楞纸板新材料。深入分析镀铝瓦楞纸板商业化应用,生产新颖、美观具有时代特点的镀铝瓦楞纸板家具,满足市场需要并获得重大的经济效益和社会效益。     

基于双平面圆柱滚子研磨技术的工艺优化

圆柱滚子是轴承的重要组件,随着对设备仪器性能的要求不断提高,对圆柱滚子的精度和一致性要求也越来越 高。文章分析行星式双平面研磨方式下磨料粒度、研磨盘转速、夹具孔偏角对圆柱滚子的加工精度的影响情况。文中首 先基于正交实验设计了标准的L9(34)正交表,并严格按照正交表中的实验序号进行了圆柱滚子的加工实验,然后采用 信噪比和ANOVA方差法对加工结果进行数据分析,最终获得了参数的最优组合。根据优化的研磨条件进行加工,结果 显示圆柱滚子的圆度、直线度以及平行度均达到了1μm以下,优化效果显著。