国产螺旋槽密封在进口压缩机上的应用

介绍了国产螺旋槽密封在进口压缩机上的应用，分析了原进口机械-浮环组合密封的失效原因，叙述了改造后国产浮环螺旋槽组合密封的结构和特点。     

新产品——钢带增强聚乙烯螺旋波纹管

钢带增强聚乙烯螺旋波纹管是一种创新的埋地排水管,把钢材的高刚度、高强度和聚乙烯的柔韧、耐腐结合在一起,突出的优点是环刚度高和节约原材料.     

螺旋槽管外含高浓度不凝组分蒸汽冷凝传热研究

分析了含高浓度不凝组分蒸汽在立式螺旋槽管表面强制对流冷凝的传热机理。在不凝性组分体积百分浓度超过９０％时，螺旋槽管的强化传热效果不明显，而含量为４４％～９０％时，螺旋槽管总换热系数比光滑管提高２０％～３５％。     

粉土地基中特殊桩型的应用与探索

粉土地基中因周边环境不允许采用挤密桩及振密砂石桩复合地基时，采用钻孔扩底桩具有经济、实用的突出优点，但是它在施工工艺方面还不够完善，尤其是持力层性质及临界厚度等条件不同时，单桩承载力设计参数的选取标准存在较大变化，本文将依据工程实例对上述有关问题进行探讨。     

异形凹槽螺旋槽管传热及流动阻力的实验研究

在螺旋槽管的基础上开发出一种新型强化管一异形凹槽螺旋槽管，对5根不同结构参数的异形凹槽螺旋槽管的换热特性和流体动力学特性进行了试验研究，实验时Re在8000-30000间，所有实验数据均在管外冷凝条件下获得的，对大量实验数据用多元线性回归法得到了具有较高精度的异形凹槽螺旋槽管的传热系数及摩擦系数的统计关联式，分析了影响异形凹槽螺旋槽管传热与流阻性能的主要因素，为换热器的设计及改造提供了理论依据。     

振动压路机振动轮的随机压振力研究

讨论了振动压路机系统的动力学问题，应用一般随机摄动方法对含有随机土参数的振动压路机振动轮的随机压振力进行了研究，且获理了理想的数值分析结果。     

螺旋埋弧焊管剩磁现象的研究

通过对螺旋埋弧焊管剩磁现象产生原因的分析,阐述了剩磁现象对螺旋埋弧焊管生产检验和管线建设的影响,提出了解决钢管剩磁问题的几种方法.     

Whole Body Vibration Improves Brain and Musculoskeletal Health by Modulating the Expression of Tissue-Specific Markers: FNDC5 as a Key Regulator of Vibration Adaptations

Whole body vibration (WBV) is well known to exert beneficial effects on multiple tissues, improving synaptic transmission, muscle mass, bone quality, and reducing anxiety and depressive behavior. However, the underlying molecular mechanisms are not yet fully understood, and organs and tissues may respond differently to the vibratory stimulus depending on multiple factors. Therefore, we investigated the WBV effects on the brain and musculoskeletal tissue of 4-month-old young mice, evaluating synaptic plasticity by electrophysiological recordings and tissue organization by histology and histomorphometric analysis. Specifically, WBV protocols were characterized by the same vibration frequency (45 Hz), but different in vibration exposure time (five series of 3 min for the B protocol and three series of 2 min and 30 s for the C protocol) and recovery time between two vibration sessions (1 min for the B protocol and 2 min and 30 s for the C protocol). In addition, immunohistochemistry was conducted to evaluate the expression of fibronectin type III domain-containing protein 5 (FNDC5), as well as that of tissue-specific markers, such as brain-derived neurotrophic factor (BDNF) in brain, myostatin in muscle and collagen I (COL-1) in bone. Our results suggest that the WBV effects depend closely on the type of protocol used and support the hypothesis that different organs or tissues have different susceptibility to vibration. Further studies will be needed to deepen our knowledge of physiological adaptations to vibration and develop customized WBV protocols to improve and preserve cognitive and motor functions.     

振动钻削系统稳定性分析

在振动钻削断屑机理基础上建立振动钻削加工过程动力学模型,通过解析计算,总结出该模型能够对振动钻削系统的振幅损失进行估算,进而分析系统的稳定性,指出了钻削时应避免i的取值接近0或0.5和系统共振区。     

加固计算机板卡振动分析与设计

传统意义下印制电路板的振动分析与设计主要是针对从电子元器件选型开展的,并不适用于商用计算机的加固技术.对商用计算机的板卡进行有效的加固设计,使其满足在振动环境下的使用要求,一直是计算机加固技术的重点.针对加固计算机板卡开展的振动分析表明,已有的加固技术并不能降低恶劣环境下板卡的振动位移,解决该问题必须采用全新的加固思路.商用计算机板卡的最新加固方案在理论分析方面和工程应用方面均表明是有效可行的,具有广泛的推广价值.