该文以太白贝母粗多糖(polysaccharide of fritillaria taipaiensis, PFT)及牛乳为原料,进行乳酸发酵,制得一种新型的具有潜在保健价值的酸奶食品。通过PFT酸奶的感官评价并结合酸度、粘度等理化指标,确定了PFT酸奶的生产工艺参数。利用...该文以太白贝母粗多糖(polysaccharide of fritillaria taipaiensis, PFT)及牛乳为原料,进行乳酸发酵,制得一种新型的具有潜在保健价值的酸奶食品。通过PFT酸奶的感官评价并结合酸度、粘度等理化指标,确定了PFT酸奶的生产工艺参数。利用Biolog测定PFT酸奶发酵过程中微生物对不同碳源的作用,发现其中对二糖、多糖底物的利用强度最大。以未添加PFT酸奶为对照,通过质构剖面分析法(TPA)研究不同时间对PFT酸奶质构影响,表明PFT酸奶随着老化时间延长,硬度和粘度增加,相比未添加PFT制得的酸奶硬度和粘度相对较低。展开更多
According to the simulation of nitrogen sorption process in porous media with three-dimensional network model, and the analysis for such a process with percolation theory, a new method is proposed to determine a pore ...According to the simulation of nitrogen sorption process in porous media with three-dimensional network model, and the analysis for such a process with percolation theory, a new method is proposed to determine a pore structure parameter--mean coordination number of pore network, which represents the connectivity among a great number of pores. Here the 'chamber-throat' model and the Weibull distribution are used to describe the pore geometry and the pore size distribution respectively. This method is based on the scaling law of percolation theory after both effects of sorption thermodynamics and pore size on the sorption hysteresis loops are considered. The results show that it is an effective procedure to calculate the mean coordination number for micro- and meso-porous media.展开更多
This paper studies the damage-viscoelastic behavior of composite solid propellants of solid rocket motors(SRM).Based on viscoelastic theories and strain equivalent hypothesis in damage mechanics,a three-dimensional(3-...This paper studies the damage-viscoelastic behavior of composite solid propellants of solid rocket motors(SRM).Based on viscoelastic theories and strain equivalent hypothesis in damage mechanics,a three-dimensional(3-D)nonlinear viscoelastic constitutive model incorporating with damage is developed.The resulting viscoelastic constitutive equations are numerically discretized by integration algorithm,and a stress-updating method is presented by solving nonlinear equations according to the Newton-Raphson method.A material subroutine of stress-updating is made up and embedded into commercial code of Abaqus.The material subroutine is validated through typical examples.Our results indicate that the finite element results are in good agreement with the analytical ones and have high accuracy,and the suggested method and designed subroutine are efficient and can be further applied to damage-coupling structural analysis of practical SRM grain.展开更多
文摘该文以太白贝母粗多糖(polysaccharide of fritillaria taipaiensis, PFT)及牛乳为原料,进行乳酸发酵,制得一种新型的具有潜在保健价值的酸奶食品。通过PFT酸奶的感官评价并结合酸度、粘度等理化指标,确定了PFT酸奶的生产工艺参数。利用Biolog测定PFT酸奶发酵过程中微生物对不同碳源的作用,发现其中对二糖、多糖底物的利用强度最大。以未添加PFT酸奶为对照,通过质构剖面分析法(TPA)研究不同时间对PFT酸奶质构影响,表明PFT酸奶随着老化时间延长,硬度和粘度增加,相比未添加PFT制得的酸奶硬度和粘度相对较低。
基金Supported by the National Natural Science Foundation of China(No.29776038).
文摘According to the simulation of nitrogen sorption process in porous media with three-dimensional network model, and the analysis for such a process with percolation theory, a new method is proposed to determine a pore structure parameter--mean coordination number of pore network, which represents the connectivity among a great number of pores. Here the 'chamber-throat' model and the Weibull distribution are used to describe the pore geometry and the pore size distribution respectively. This method is based on the scaling law of percolation theory after both effects of sorption thermodynamics and pore size on the sorption hysteresis loops are considered. The results show that it is an effective procedure to calculate the mean coordination number for micro- and meso-porous media.
基金supported by the National Natural Science Foundation of China(Grant No.11132012)
文摘This paper studies the damage-viscoelastic behavior of composite solid propellants of solid rocket motors(SRM).Based on viscoelastic theories and strain equivalent hypothesis in damage mechanics,a three-dimensional(3-D)nonlinear viscoelastic constitutive model incorporating with damage is developed.The resulting viscoelastic constitutive equations are numerically discretized by integration algorithm,and a stress-updating method is presented by solving nonlinear equations according to the Newton-Raphson method.A material subroutine of stress-updating is made up and embedded into commercial code of Abaqus.The material subroutine is validated through typical examples.Our results indicate that the finite element results are in good agreement with the analytical ones and have high accuracy,and the suggested method and designed subroutine are efficient and can be further applied to damage-coupling structural analysis of practical SRM grain.
