表面活性剂的不同添加量对黄霉素发酵效价的影响

试验研究了表面活性剂的不同添加量在黄霉素发酵过程中对促进黄霉素效价的影响。结果显示,在发酵摇瓶中添加不同比例的表面活性剂,有助于黄霉素发酵效价的提高,其中以添加0.7%的表面活性剂效果最佳。     

Analysis on Overall Buckling Behavior of Stainless Steel Welded I-beams and Design Methods

猕猴桃是一种营养价值很高的水果,属于呼吸跃变型果实,采后极易腐烂。本文综述了猕猴桃果皮、果籽、果肉、皮渣的综合利用现状及目前猕猴桃产品加工过程中减少VC损失和防褐护色关键技术的应用与研究进展,并结合国内外猕猴桃产业的发展状况,展望了猕猴桃果实的加工利用前景。     

A precise finite element modeling approach for analyzing linear rolling guideway dynamics

以燕麦加工产品的剩余滤渣为原料,研究酶-碱结合法制备燕麦麸膳食纤维的提取工艺。在单因素试验的基础上,通过正交试验,确定提取燕麦麸膳食纤维的最佳工艺条件为:料水比1∶10,α-淀粉酶添加量1.5%,溶液pH 6.5,65℃条件下酶解30 min,酶解液加3%浓度为1 mol/L的NaOH溶液,60℃条件下碱解40 min。制得的燕麦麸膳食纤维的提取率可达56.43%,持水力为3.414 9 g/g,溶胀性为3.13 mL/g。     

Correlation and regression analysis of air-gap discharge and gas generation law in oil-paper insulation

The air gap discharge is the main pattern of partial discharge of transformer insulation paper. Studying the correlation of partial discharge and gas production rules is important to diagnose early generation and development of the paper oil insulation. The paper design a simulation experiment system of transformer partial discharge in laboratory, and study gas discharge and development characteristics under the condition of 60 ℃ and the way of increasing voltage method. By major-content method, six major factors are selected from 29 statistic operators. And the six major factors are independent with each other. Results show that there is correlation between six kinds of gas and six major factors by correlation and regression method, and multivariable linear regression model of six kinds of gas and six major factors is presented. The above results provide a new idea for further discussing the relationship between early development of transformer partial discharge and the rule of gas production in oil.