基于模糊PID参数自整定的细胞培养箱温度控制算法

针对细胞培养箱温度控制具有非线性、时滞性、易受干扰且难以建立精确的数学模型的特点,传统的PID控制方法对于快速维持系统箱内温度稳定存在一定的局限性。提出了以温度误差和误差变化率为控制输入,培养箱内温度为控制量的模糊PID参数自整定的温度控制算法,实现了对PID参数的实时在线修正。实验表明,该模糊PID参数自整定温度控制算法,温度从26℃上升到目标温度37℃,建立稳态的时间为2890s,温度超调极小。系统温度控制精度为±0.05℃,并在相同型号的细胞培养箱上同样得到验证。在控制稳定性方面获得了比传统PID控制更好的控温效果,稳定快,极小超调,温度控制精度高,能满足细胞培养箱温度控制的要求。     

Periodic peristalsis enhancing the high solids enzymatic hydrolysis performance of steam exploded corn stover biomass

Enzymatic hydrolysis beyond 15% solid loading offers many advantages such as increased sugar and ethanol concentrations and decreased capital cost. However, difficult mixing and handling limited its industrialized application. A novel intensification method, periodic peristalsis, had been exploited to improve the high solids enzymatic hydrolysis performance of steam exploded corn stover (SECS). The optimal steam explosion conditions were 200 °C and 8 min, under which glucan and xylan recovery was 94.3% and 64.8%, respectively. Glucan and xylan conversions in periodic peristalsis enzymatic hydrolysis (PPEH) were 28.0–38.5% and 25.0–36.0% higher than those in static state enzymatic hydrolysis with solid loading increasing from 1% to 30%, respectively, while they were 1.0–11.2% and 3.0–9.2% higher than those in incubator shaker enzymatic hydrolysis (ISEH). Glucan and xylan conversion in PPEH at 21% solid loading reached 71.2% and 70.3%, respectively. Periodic peristalsis also facilitated fed-batch enzymatic hydrolysis of which SECS was added completely before transition point. Results presented that PPEH shortened the transition point time from solid state to slurry state, decreased the viscosity of hydrolysis mixture, and reduced the denaturation effect of enzymes compared with ISEH, and hence improve the high solids enzymatic hydrolysis efficiency.     

婴儿培养箱质量控制规范的研究

婴儿培养箱属于高危医疗设备，为保证临床应用中的婴儿培养箱的安全性和有效性，必须对其进行质量控制。本文介绍了婴儿培养箱临床使用中常见的风险，并从风险防范的角度出发来制定婴儿培养箱质量控制规范，以解决婴儿培养箱在临床应用中的质量控制问题。     

产业孵化器设计模式探讨

对孵化器进行了介绍,深入探讨了影响孵化器设计的主要理论,通过分析孵化器设计的原则,探索了当代孵化器设计的基本方式和方法,论述了建筑师在设计中的义务和职能,从而促进产业孵化器的发展。     

惠州大亚湾区科技创新园孵化器建设的思考

对比分析了深圳中国科技开发院和大亚湾科技创新园建设科技企业孵化器的优劣．对大亚湾科技创新园孵化器建设提出了一些对策建议,为在经济技术开发区建设科技企业孵化器提供参考。     

微波热风技术在艾萨炉电收尘中的半工业化研究

针对云南某厂艾萨炉烟气电收尘设备对保温箱温度的技术要求,在前期小实验基础上进行半工业化试验,研究微波功率和初始微波加热体温度对保温箱平衡温度的影响。结果表明增大微波功率和初始微波加热体温度能显著提高保温箱平衡温度,在控制控制微波功率9 k W,微波加热体初始温度760℃的条件下,打开循环风机,风机电压220 V,风量为410 m3/h,经15 min传质换热后,保温箱温度达到258℃,高于云南某厂艾萨炉烟气露点温度,能满足工业应用需求。     

Evaluation of an automated cell culture incubator: the autocell 200

We evaluated the benefits of automation on the technical performance of a new automated cell culture incubator, the Autocell 200^®, developed by Jouan SA. In addition, we assessed the potential interference of the embedded mechanical parts on cell culture growth. We measured a throughput of 150 plates loaded per hour, and 120 plates unloaded per hour, which is compatible with an external robotic handler. The mean time of robotic gate opening was 7 s. The gate pathway minimized climate disturbances inside the incubator. For CO₂, we used a delay between opening events of 1 min. Biological assay results did not demonstrate a significant difference between the automated incubator and a traditional manual incubator, but we concluded that automation using the Autocell 200^® could provide meaningful benefits for cell culture.     

企业孵化器与风险投资协同发展模式

服务于创新企业的企业孵化器和投资于创新企业的风险投资在它们的发展进程中,融合协同发展势在必行。目前,在实践中已有开始尝试的,但是具体融合的模式却缺乏理论研究。在理论上从功能互补、出资方式和组建公司等方面探讨了6种可能的两者协同发展的模式。     

基于冷链物流条件下保温箱蓄冷剂的选择分析

目的 根据不同温敏产品冷链物流所需条件(温度和保温时间),对保温包装箱内蓄冷剂的选择进行分析,以提高利用效率.方法 首先建立蓄冷保温箱的有限元模型,分析冷藏和冷冻2种制冷方式时保温箱内部瞬态温度场和有效保温时间,再结合理论计算验证模型的可靠性.在外界环境温度以及箱体各参数均不变的情况下,以蓄冷剂的设计参数(相变温度和相变潜热)为研究对象,拟合出冷藏和冷冻时蓄冷剂的温控图,讨论不同冷链物流条件下保温箱蓄冷剂的选择问题.结果 通过仿真模拟,得出保温箱内温度场分布均匀,有较好的温控效果;仿真和理论所得的保温时间数值相近,最大偏差为6.58％;由仿真数据得出了3种常见冷链物流条件下箱内蓄冷剂设计参数的合理选择范围.结论 在不同冷链物流条件下,合理选择蓄冷剂的设计参数可确保温箱的温控效果,为冷链物流运输中蓄冷剂的选择及控温包装的优化设计提供理论基础.     

网络直播营销中的食品安全监管问题与治理

采用文献调研、案例分析等方法总结了当前网络直播营销市场的发展现状,指出了直播营销市场存在的食品安全问题,分析了直播电商中的食品安全事故案例。针对这些问题,提出应加强直播内容审核、加大监管力度、疏通消费者投诉渠道和加速相关立法进程等专项治理策略;对网络营销中自制食品可采取孵化器的形式予以辅导、支持和投资,促使其向正规化生产转化。