大跨度双小车门式起重机下降失速故障分析

介绍自激式动力制动控制的特点，分析在起重机应用中的故障．     

热真空试验系统中的温度同步控制算法研究

论文以热真空试验设备为研究对象,针对热试验过程中的产品各区域温度同步问题,提出了一种相邻交叉耦合结构的PID控制算法,并设计开发了控制系统的软硬件平台,对所提出的相邻交叉耦合结构PID控制算法进行实验验证,结果表明本文提出的算法具有较高的精度和同步性,对改善热试验的品质及产品转温过程中温度的动态性能提升有着重要意义。     

Isolation and characterization of heterotrophic nitrifying bacteria in MBR

The study presented the method for isolating the heterotrophic nitrifiers and the characterization of heterotrophic nitrification. Continuous tests via a membrane bioreactor (MBR) were operated under the controlled conditions to proliferate the nitrifiers. Heterotrophic nitrifying bacteria were isolated from the system in which the efficiency of total nitrogen(TN) removal was up to 80%. Since no autotrophic ammonium and nitrite oxidizers could be detected by fluorescence in situ hybridization(FISH), oxidized-N production was unlikely to be catalyzed by autotrophic nitrifiers during the heterotrophic nitrifiers‘ isolation in this study. The batch test results indicate that the isolated heterotrophic bacteria were able to nitrify. After 3 weeks incubation, the efficiencies of the COD removal by the three isolated bacterial strains B1,B2 and B3 were 52.6%, 71.7%, and 77.7%, respectively. The efficiencies of the TN removal by B1, B2, and B3 were 35.6%, 61.2% and 68.7%, respectively.