FIC-330汽轮机组前箱齿轮断裂原因分析

蒲城1、2号机组自2001年10月19日以来，主油泵齿轮断齿5次，主齿轮断齿3次，严重危害机组的安全稳定运行。断齿原因涉及备品加工、检修安装、运行问题。经分析频繁断齿的主要原因为西航加工的备品齿轮齿表面渗碳强化层不均匀，硬度梯度大，断裂处渗碳层仅为0．3mm，齿根底存在严重的加工刀痕，使齿轮的接触和弯曲疲劳强度大幅下降。在刀痕底部形成压痕点，萌生裂纹，在渗碳层产生沿晶断裂，断裂过程为剪切断裂。     

回转式空气预热器再燃烧的预防与处理

本文根据空气预热器发生的再燃烧事故，进行了原因分析，找出根本提出了预防措施和可行办法是有效的。     

基于USB接口的医院ICU病房音乐治疗控制系统设计

本文阐述了目前ICU(IntensiveCareUnit)病房音乐治疗控制系统设计存在的不足,提出如何利用计算机新的USB接口技术和MP3音乐解码电路组成的多路音乐点播控制系统,具体包括该音乐治疗系统组成设计、接口电路硬件设计、驱动程序设计、MP3音乐解码电路设计和应用程序设计。     

餐桌废物环保处理自动化设备的工艺研究

如何合理地利用“餐桌废物”已经成为摆在人们面前的重要课题，“餐桌废物”的合理处置也是目前急待解决的社会性问题。本文对餐桌废物处理设备的新工艺进行了详细的研究，为餐桌废物处理设备的进一步发展提供了依据。     

Coating of a lignocellulosic aggregate with pectin/polyethylenimin mixtures: Effects on flax shive and cement-shive composite properties

Lignocellulosic lightweight concretes are a potential contributor to sustainable development. However, lignocellulosic aggregates are not always fully compatible with cement matrices leading to setting delays, significant dimensional variations and low mechanical strengths. An aggregate treatment, reducing water absorption and water-soluble molecule release, can avoid or reduce these drawbacks. In this study a coating treatment, using a pectin/polyethylenimin (PP) mixture, was applied to flax shives, which is a lignocellulosic by-product. Before shive coating, a dilution with distilled water or a micro-wave heating were conducted to decrease PP mixture viscosity.The PP treatment involved a decrease in shive water absorption. Compared to standard shive concrete, treated shive concrete exhibited a decrease in setting delay with an increase in cement hydration enthalpy, an increase in mechanical strengths and a significant reduction in dimensional variations. Although a slight increase in thermal conductivity and bulk density was measured, the cement-shive composite obtained still belongs to the insulating concrete category.     

某进口变压器产气原因分析与处理

本文中作者介绍了某台进口变压器的结构特点和产气情况,并对产气率高的问题进行了分析和试验,给出了该问题的处理措施。     

消除汽缸变形 提高机组热效率

针对某热电厂150MW热电联产机组存在的汽轮机高中压内缸变形严重的问题，分析了其对汽轮机缸效、热耗带来的影响，通过与修造厂合作，现场自主处理了汽缸变形严重的缺陷，提高了高中压缸的缸效，为企业的节能降耗取得了明显的成效。     

<i>Trypanosoma rangeli:</i> growth in mammalian cells <i>in vitro</i> and action of a repositioned drug (17-AAG) and a natural extract (<i>Artemisia sp</i>. essential oil)

Trypanosoma rangeli and T. cruzi are both parasitic unicellular species that infect humans. Unlike T. cruzi, the causative agent of Chagas disease, T. rangeli is an infective and non-pathogenic parasite for humans, but pathogenic for vectors from the Rhodnius genus. Because both species can coexist in different hosts and overlap their infective cycles but very little is known about the infection of T. rangeli in mammalian cells, we decided to characterize both the development of this parasite in cell culture and the effect of therapeutic agents with potential trypanocidal action on it. We found that T. rangeli exhibits a cycle of infection in Vero cells similar to that for T. cruzi and that the repurposed drug, 17-AAG, and the natural extract Artemisia sp. essential oil produce a toxic effect on epimastigotes showing a trypanocidal action from the fifth day of culture. Both treatments also affected the infection of trypomastigotes and reduced the capacity of replication of amastigotes of T. rangeli. Since T. cruzi / T. rangeli coinfection cases have been reported, the finding of drugs with potential activity against both species could be significant in the future. Furthermore, studies of susceptibility of both species to drugs could also help to know the different mechanisms of pathogenicity in humans displayed by T. cruzi that are absent in T. rangeli