改良A^2/O工艺在寒冷地区城市污水处理中的应用

传统A^2/O工艺的脱氮除磷效果有限,特别是在寒冷地区,为提高处理效果,产生了改良A^2/O工艺。黑龙江省某市污水处理厂采用改良A^2/O工艺处理市政污水,使其处理达标排放,介绍了此处理工艺中各个构筑物的设计参数和工程运行情况。     

Field investigation of pavement rehabilitation utilizing cold in-place recycling

Despite the widespread field and laboratory research works there are still a lot of unknown aspects about the cold in-place recycling. This paper presents the outcomes of a five year evaluation of a major highway in Iran which had been rehabilitated by cold in-place recycling. Before starting the rehabilitation process, a comprehensive field survey was performed. During the pavement surveying, type, severity and reason of distresses were investigated and PCI parameter was calculated. Furthermore, both destructive and nondestructive tests were carried out to evaluate the pavement condition and estimate the remaining life. On the basis of these investigations studied highway was divided to six design sections. Based on technical analysis four sections were recycled whereas two other sections were rehabilitated with the conventional cold milling and overlay method. Afterwards, the pavement performance was monitored during the next 5 years. After about six months of monitoring, structural failures were detected in about 10% of recycled areas. Based on field surveying, low compaction and load bearing of subgrade materials and lack of high quality unbound pavement layers accompanied by some shortcomings in recycled layer resulted in undesirable results in these areas. Based on obtained results and performed analysis a practical flowchart was presented which could be used as a project selection guideline.     

带翼内凸筋D形铝管连续挤压生产工艺的研究

运用所制定的连续挤压工艺生产方案生产了传热性能高的铝内凸筋D形管 ,通过连续挤压工艺试验 ,对影响D形管机械性能的因素以及显著影响D形管传热效果的内凸筋高度的成形规律 ,从制定挤压工艺的角度进行了观察和分析 ,为进一步推广工业化生产提供了有价值的数据和理论指导。     

实体轴承保持架的冷挤压加工

此文提出了采用冷挤压成形轴承实体保持架的工艺,并对该工艺进行了实验研究。经过大量的工艺实验,找到了适宜工业生产的工艺路线。还对车制及冷挤压两种工艺生产的实体保持架组装的2314E轴承物理及使用性能进行了测试和分析。