排序方式: 共有13条查询结果,搜索用时 46 毫秒
1.
2.
通过UNITANK工艺与倒置A2/O工艺对低碳源城市生活污水的中试处理效果、UNITANK工艺与改良型A2/O工艺在南方地区的实际生产运行效果的对比研究表明,UNITANK工艺和A2/O工艺对南方地区低碳源城市生活污水均具有较好的处理效果,出水水质均可达到《城镇污水处理厂污染物排放标准》(GB 18918—2002)的一级A标准。综合考虑,虽然UNITANK工艺的处理效果略逊于A2/O工艺,但其运行维护费用更低、控制更加灵活、运行管理更为简单。因此,新建污水处理厂可优先选择UNITANK工艺。 相似文献
3.
分别采用熔铸法和D-KH法(叠轧复合-扩散合金化工艺)制备了Ag-22.4Cu-20Sn钎料合金,采用XRD、SEM、DSC及万能力学试验机等测试技术,对合金相组成、显微组织、熔化特性、钎焊接头的剪切强度和钎焊界面形貌等进行了对比研究。结果表明,D-KH法制备的钎料相组成为(Ag)、Cu3Sn、Ag5Sn相,而熔铸法制备的钎料相组成为(Ag)、Cu3Sn、Ag5Sn以及Cu41Sn11相;D-KH法制备的钎料合金液固相线均降低,熔程减小。与熔铸法相比,用D-KH法制备得到的厚度0.1 mm的钎料薄带,润湿铺展性更优、接头剪切强度更高、接头强度稳定性更好。 相似文献
4.
5.
6.
7.
In this study, the extraction process of total saponins from Rubus crataegifolius Bunge. roots was investigated and optimized by response surface method. The effects of ethanol concentration, extraction time and solid-liquid ratio on the extraction rate of total saponins from pallets were investigated. The results showed that the optimal extraction conditions of the total saponins from the pallets were: extraction time 2 h, ethanol concentration 71%, liquid-solid ratio 28:1 mL/g, the predicted value was 3.49%. Under these conditions, the extraction rate of total saponins from R. crataegiolius Bunge. roots was 3.366%. The IC50 (mg/mL) values of total saponins extract from R. crataegifolius Bunge. roots against DPPH·, ABTS+· and superoxide anion free radicals were 0.0782, 0.277 and 0.9954 mg/mL, respectively. Therefore, the response surface method to optimize the extraction process of total saponins from R. crataegifolius Bunge. roots was effective, reliable, stable and feasible, and this article would provide scientific basis for the development and utilization of total saponins from pallets as natural antioxidants. 相似文献
8.
9.
10.
本文介绍36m跨锯齿形锥壳屋盖厂房的动力实测和有限元方法计算其地震效应的分析结果。实测中采用了激振、冲击和脉动等方法,获得了该结构的自振频率、振型和阻尼。用有限元方法和程序进行了大量分析计算,探求到其动力特性和地震效应的特点。实测和计算均表明:计算的自振频率和振型与实测值符合;地震效应以垂直振型为主;一般应取前10个振型进行振型组合。试验研究结果表明该结构具有良好的抗震性能,在8度地震区使用是安全的。这一研究为推广和改进这类结构提供了实践和依据, 相似文献