Effects of Cerium on Microalloying in Low Sulfur Nb-Ti-Bearing Steel

The overcooling austenite CCT curves were investigated by using THERMECMASTOR-Z simula-tion machine, the test samples refining from 50kg vacuum induction furnace and two-stage controlled rolling in laboratorial condition. Test results show that addition cerium (Ce) in low sulfur Nb-Ti-bearing steel affects as follows: Ce can. increase the transformation point t Ar3 and t Ar1, enlarge the intervals of temperature (tAr1-tAr3).Ce can make the CCT curves to move upper and right, reduce the hardenability. Ce can increase the transformation temperature of bainite and enlarge intervals of bainite. The martensites become from coarse strip to fine strip by Ce in higher cooling rates. Ce can decrease MS and enhance the trend of lath martensitic structure and limit the formation of lamellar crystal.     

防止汽轮发电机定子漏水及内冷水系统堵塞故障的措施和经验

本文对QFQS—200—2型水内冷汽轮发电机定子漏水以及内冷水系统堵塞故障的部位及原因进行分析，并针对这些原因提出相应的预防措施和经验。     

杀菌剂异螺环-4-烯-2,3-5''''-氯-吲哚的合成

研究了以薯蓣皂素(diosgenin)为原料,根据活性叠加原理,在分子中引入一个新的活性基团吲哚环,合成了全新化合物异螺环-4-烯-2,3-5'-氯-吲哚.杀菌药效试验结果表明:所设计的全新目标化合物具有原料所没有的杀菌活性.     

Measurement system for wind turbine acoustic noise assessment based on IEC standard and Qin＇s model

A novel measurement system specially used in noise emission assessment and verification of wind turbine generator systems is presented that complies with specifications given in IEC 61400-11 to ensure the process consistency and accuracy. Theory elements of the calculation formula used for the sound power level of wind turbine have been discussed for the first time, and detailed calculation procedure of tonality and audibility integrating narrowband analysis and psychoacoustics is described. With a microphone and two PXI cards inserted into a PC, this system is designed in Qin＇s model using VMIDS development system. Benefiting from the virtual instrument architecture, it＇s the first time that all assessment process have been integrated into an organic whole, which gives full advantages of its efficiency, price, and facility. Mass experiments show that its assessment results accord with the ones given by MEASNET member.     

固体超强酸S_2O_8~(2-)/SnO_2-SiO_2催化合成环己酮1,2-丙二醇缩酮

采用沉淀-浸渍法制备了固体超强酸S2O28-/SnO2-SiO2,以它为催化剂催化环己酮和1,2-丙二醇合成了环己酮1,2-丙二醇缩酮;考察了带水剂种类及用量、酮醇摩尔比、催化剂用量、反应时间对产品收率的影响,并用正交实验对反应条件进行了优化。实验结果表明,适宜的反应条件为:n(环己酮)∶n(1,2-丙二醇)=1∶1.6、催化剂用量为反应物料总质量的2.0%、带水剂环己烷用量5.0mL、反应时间50min。在此条件下,环己酮1,2-丙二醇缩酮收率达到91.47%;催化剂的稳定性良好,在重复使用5次后环己酮1,2-丙二醇缩酮收率为82.20%,活性下降的主要原因为催化剂表面积碳和吸附了有机物;经傅里叶变换红外光谱和气相色谱质谱分析表明,产物为环己酮1,2-丙二醇缩酮,纯度为100%。     

荷载一位移智能检测仪

本文介绍了一种用于工程结构强度现场检测的荷载一位移智能检测仪，它有定时检测和随机招呼检测等方式，能与基地PC机进行通讯，由PC机对检测数据做进一步处理，如制表、终曲线和对检测结果进行硬拷贝等。