捣固装置提升油缸故障分析及其改进措施探讨

本文对铁路大型养路机械捣固车捣固装置提升油缸出现的活塞杆折断、螺纹滑丝及泄露等常见故障进行了较详细的分析,并针对故障原因,从设计角度提出了改进措施和建议,对于养路振捣车振捣装置的设计具有参考意义。     

汽车吊车钢丝绳的安装维修技术

以QY-20汽车吊车为例,介绍专用汽车钢丝绳安装和维修的改进方法,以提高钢丝绳的有效工作时间,有利于专用汽车的安全生产和节能降耗工作。     

导弹装备检修方法探讨

导弹装备属电子装备,在日常使用时需经常性的开展维护和检修工作,而导弹维修技师作为检修人员,必须掌握导弹等电子装备的检修方法。本文介绍了导弹装备的常见故障、检修步骤、诊断方法,总结了故障分析方法,对导弹维修技师开展导弹装备维修具有一定的借鉴意义。     

京石高速公路预防性养护措施探讨

通过对预防性养护的概念、常见的养护方法进行介绍,并结合京石高速公路实际,对微表处施工进行说明,对于预防性养护观念的深入和相关技术的推广,具有积极的意义。     

基于工程复杂程度指标评价的公路养护工程设计取费标准研究

结合公路养护工程的特点和工程复杂程度对设计工作量的影响,探讨公路养护工程复杂程度评价指标应遵循的原则及确定的方法,建立一套指导公路养护工程设计取费的指标体系,可为养护工程设计取费标准的合理确定提供理论参考。     

沥青混凝土路面早期病害成因分析及处治方法

从工程实际出发,对沥青路面早期病害成因进行分析,提出对裂缝处进行压浆处理、在基层松散处设置横向排水沟的措施,针对施工前、施工中的检测控制等提出在实际施工中的有效质量控制措施和注意事项,从而保证施工质量,以达到预防性养护的目的。     

水上钢支架设计和施工

以实际桥梁修复工程为例,基于钢支架的受力特点,有关主梁荷载向横桥向分配梁、贝雷梁、工字钢垫梁及钢管桩等的传递特点分析表明,该钢支架设计方案是成功的,可为类似工程提供借鉴。     

沥青路面冷再生技术在坝上地区车辙维修处治中的应用

针对承德围场坝上地区公路长大纵坡段出现的日益严重的车辙病害,采取沥青路面就地冷再生技术进行维修处治,取得了很好的效果,证明就地冷再生技术在山区公路大中修施工中具有广阔的应用和推广前景。     

莱钢东泉河大桥养护施工设计方案

桥梁的养护工作直接影响着桥梁的使用寿命,莱钢东泉河铁路桥的工程人员经实地考察、研究分析后设计制定了一套养护施工方案,并付诸于实践,顺利完成了大桥的养护工程,为今后桥梁的养护施工积累了宝贵的经验。     

The effect of Levocarnitine on nutritional status and lipid metabolism during long-term maintenance hemodialysis

Objective To investigate the effect of Levocarnitine on lipid metabolism and nutritional status of maintenance hemodialysis (MHD) patients and possible mechanism. Methods A total of 40 MHD patients [mean age (53.5±7.1) years] who underwent normal hemodialysis more than 6 months were randomly classified into two groups, Levocarnitine supplemented group (LS-G) (n=20; Levocarnitine supplementation after each normal hemodialysis session, at a dose of 1.0 g/day by intravenous administration) and control group (C-G) (n=20; normal hemodialysis). Before treatment, one month and three months after treatment we respectively measured or observed the following items, the tolerance to hemodialysis, carnitine level in plasma, C-reactive protein, IL-6, TNF-α, percentage of neutrophil, and some relevant nutritional parameters, such as lipid profile, transferrin, total protein, albumin and prealbumin levels. Comparative analysis was conducted between the two groups. Results In LS-G three months after treatment, the levels of carnitine, hemoglobin, and prealbumin in plasma were significantly increased (P<0.05), but C-reactive protein, neutrophil percentage, low-density lipoprotein and triglyceride were significantly decreased (P<0.05) in contrast to those in C-G and before treatment. Transferrin, total protein, and albumin were elevated in LS-G, with no statistical significance. Conclusion There was a significant improvement of lipid metabolism and nutritional status for the long-term maintenance hemodialysis patients with Levocarnitine supplementation. And this improvement is related to the decrease of inflammatory factors.