精处理混床氨化运行

通过对发电厂凝结水精处理氨化运行描述,介绍了精处理系统氨化运行原理,并对运行效果进行了分析,提出了注意事项。

A STUDY ON THE MICROSTRUCTURE AND FRACTURE PROCESS OF A PEARLITIC STEEL BY MEANS OF EDC TECHNIQUE

An investigation of the microstructure and the mioroprocess of fracture of an eutectoid pearlitic steel has been carried out by means of electron-diffraction-contrast(EDC) and other analytical techniques. The nature of the dislocations in pro-eutectoid-ferrite and ferrite in pearlite was determined. The character of interface conjunction between ferrite and cementite was discussed. The fracture process of pearlitic steel has been analysed crystallographically.

异普克公猪异味控制疫苗对猪生长性能及胴体品质的影响

试验目的是评估辉瑞动保研制的异普克(Improvac)疫苗对公猪异味控制、公猪生长性能及胴体品质等方面的影响。研究结果显示,免疫异普克能够有效去除公猪异味,同时公猪生长性能及胴体品质也得到不同程度的改善。其中,免疫组出栏重平均每头提高2.73 kg(P>0.05),死淘率降低4.66个百分点,断奶到出栏期间平均每头耗料量降低14.25 kg,日增重增加18.16 g,料重比降低0.267。与去势组相比,免疫组屠宰率提高0.04个百分点,6～7肋背膘厚降低0.18 cm(P<0.05),最后肋骨处背膘厚降低0.22 cm(P<0.01)。