微生物发酵过程优化控制技术进展

微生物发酵过程优化控制技术是发酵工程的重要技术。综述了近年来微生物发酵过程优化控制技术的研究现状,讨论了机理分析建模、黑箱建模、混合建模等发酵过程建模方法,对基于模型的优化控制策略进行了分析。指出了基于混合模型和多目标优化策略建立动态优化控制器,是微生物发酵过程优化控制的有效方法,并给出了实现优化控制需要解决的关键问题。     

烟酮合成条件的优化

文章研究了30%的双氧水在不同pH、溶剂、温度和催化剂条件下氧化异佛尔酮为2,3-氧化异佛尔酮的反应,同时优化出了后者分别在浓盐酸或硫酸作用下水解得到烟酮的最佳条件。该合成方法收率比文献报道有所提高。     

磁场及磁水对超甜玉米种子萌芽的影响

[目的]探讨磁场及磁水对超甜玉米种子萌芽的影响程度.[方法]以超甜玉米的种子为试材, 用9 000μT均匀恒定磁场分别进行不同时间磁场处理的磁化水浸种,其磁场处理时间分别为10、30、60、90和120 min,研究不同磁处理剂量对超甜玉米种子发芽指标的影响.[结果]不同时间磁场处理表明,用9 000μT磁场处理超甜玉米种子60 min,其磁化水浸种的发芽率比对照高83%,发芽指标最高,并比其他处理组发芽率高40%～76%;60 min处理组的发芽势比对照约高出1倍,其他各组的发芽势也比对照高46%～93%.磁场处理种子2 h后再用自来水浸种处理表明,用磁化水浸种比用普通水浸种的发芽率高23%,发芽势高30%,活力指数高30%.[结论]用9 000μT磁场处理超甜玉米种子可以提高种子的各项发芽指标.     

烟用香精调配稳定性的X质量控制图监控

为了监控二次调配烟用香精的稳定性,建立了采用检测相对密度、GC法测定各批次调配香精含水率、乙醇和丙二醇及某些特有成分含量的变化,并根据其X-质量控制图上、下控制限监控香精调配稳定性的方法。     

GE气化炉上升管与降液管环隙流体的应用研究

利用垂直管两相流的数学模型,对GE气化炉内上升管与降液管环隙中合成气-激冷水形成的两相流进行计算,归结出液位与持液量、流体流型的相互影响。     

基于CCPM的矿井建设计划的制定

目前,矿井建设多采用网络计划技术制定,但该传统技术存在估算工期过长、计划缺乏柔性等缺陷,本文引入关键链项目管理（CCPM）方法,通过设置项目缓冲区和输送缓冲区控制建设进度,有效降低了不确定因素对计划的影响,增强了计划的柔性,且保证了确定环境下编制的矿井建设计划,在不确定环境下的顺利执行。     

不敏变换鲁棒Kalman滤波器在发酵过程中的应用(英文)

State estimation is the precondition and foundation of a bioprocess monitoring and optimal control. However, there are many difficulties in dealing with a non-linear system, such as the instability of process, un-modeled dynamics, parameter sensitivity, etc. This paper discusses the principles and characteristics of three different approaches, extended Kalman filters, strong tracking filters and unscented transformation based Kalman filters. By introducing the unscented transformation method and a sub-optimal fading factor to correct the prediction error covariance, an improved Kalman filter, unscented transformation based robust Kalman filter, is proposed. The performance of the algorithm is compared with the strong tracking filter and unscented transformation based Kalman filter and illustrated in a typical case study for glutathione fermentation process. The results show that the proposed algorithm presents better accuracy and stability on the state estimation in numerical calculations.     

应用群能量恒定粒子群优化算法的批次流加发酵过程批次间优化(英文)

An iterative optimization strategy for fed-batch fermentation process is presented by combining a run-to-run optimization with swarm energy conservation particle swarm optimization (SEC-PSO). SEC-PSO, which is designed with the concept of energy conservation, can solve the problem of premature convergence frequently appeared in standard PSO algorithm by partitioning its population into several sub-swarms according to the energy of the swarm and is used in the optimization strategy for parameter iden-tification and operation condition optimization. The run-to-run optimization exploits the repetitive nature of fed-batch processes in order to deal with the optimal problems of fed-batch fermentation process with inaccurate process model and unsteady process state. The kinetic model parameters, used in the operation condition optimization of the next run, are adjusted by calculating time-series data obtained from real fed-batch process in the run-to-run optimization. The simulation results show that the strategy can adjust its kinetic model dynamically and overcome the instability of fed-batch process effectively. Run-to-run strategy with SEC-PSO provides an effective method for optimization of fed-batch fermentation process.     

基于IVI模型的VXI总线任意函数发生器驱动程序的设计

VXI总线硬件平台是仪器总线和自动测试系统的优秀平台.本文介绍了基于VXI总线的虚拟仪器驱动程序的IVI模型,给出了其结构和工作原理,应用IVI模型设计了VXI总线虚拟任意函数发生器的驱动程序.该虚拟仪器驱动程序能够实现VXI总线任意函数发生器的驱动.     

18MnNiMo焊接试板接头性能讨论

通过对母材为１８ＭｎＮｉＭｏ的焊接试板强度失效的讨论,从而说明在施焊过程中如何严格控制工艺程序以得到满意的焊接接头质量。