固相微萃取-气相色谱-质谱法分析香水百合的头香成分

The headspace constituents released from fresh flowers of lilium. spp were sampled by solid phase microextraction(SPME). The chemical constituents were separated and identified by gas chromatography-mass spectrometry. Linalol（59.64%）, trans-ocimene（30.35%）, benzene, 1,4-dimethoxy（2.03%）, benzoic acid, methyl ester（1.69%）, phenol, 2-methoxy-4-(1-propenyl), (E)-（1.69%）,β-pinene（1.56%） were the most abundant volatiles released from fresh flowers of lilium. spp and a total of 23 volatile compounds were identified in this study. The results demonstrated that headspace SPME-GC/MS is a simple, rapid and solvent free method suitable for analysis of volatile compounds emitted from fresh flowers of lilium. spp.     

高温型α-淀粉酶制取麦芽糊精工艺条件的优化

研究了高温型α-淀粉酶水解玉米淀粉制备麦芽糊精的工艺，通过正交试验对其工艺条件进行了优化。结果表明，高温型α-淀粉酶制备麦芽糊精的最佳工艺为：温度90℃、时间80min、加酶量60U／g。     

基于混合非线性规划的混合式齿轮减速器离散优化设计

以工程实例(弧齿锥齿轮-斜齿圆柱齿轮三级减速器)为研究对象,构建混合式齿轮减速器优化模型,该模型中含有离散型变量(模数)、整型变量(齿数)和连续型变量(齿宽、螺旋角等),是一种复杂的混合非线性规划问题。在优化求解中,提出了一种新的优化求解算法,该算法实现了模数、齿数等变量的离散取值,弥补了以往优化设计中将离散变量作为连续变量求解的不足。优化结果表明:优化方案符合工程设计的需要,并在减小减速器体积、节省材料等方面具有显著的现实意义。该离散优化算法在上海振华港机的齿轮箱设计中得到成功应用,并作为相关设计的重要参考资料。