食品冷藏保温箱温度场模拟与实验验证

目的 研究食品冷藏保温箱在冷食冷藏工况下内部温度场的分布情况,验证保温箱温度的分布以及保温性能是否达到设计要求。方法 采用有限元方法,使用COMSOL Multiphysics构建食品冷藏保温箱热分析模型,按照冷食冷藏的工况进行温度场模拟仿真,再通过实验验证模拟结果的准确性。结果 模拟结果显示,食品冷藏保温箱内部餐盒装满0 ℃食品时,在外界环境温度为46 ℃的高温条件下贮存4 h后,食物温度由上至下递增,食物平均温度为5.55 ℃。实验结果显示,食物平均温度为6.65 ℃,均低于10 ℃。模拟结果与实验结果的平均误差为1.1 ℃。结论 食品冷藏保温箱餐盒内食物温度实验数据与模拟数据变化趋势基本一致,用数值模拟方法分析保温箱温度场可行有效。蓄冷板对提高食品冷藏保温箱保温效果有较大作用,保温性能可满足设计要求。     

A model for selecting appropriate technology for incubator-university collaboration by considering the technology transfer mechanism

A technology incubator provides an important support for a technology transfer mechanism. A technology incubator bridges the incubatees to the technology provider. In our research, we propose a technology selection model for the incubatees. Incubator managers, as decision-makers, attempt to evaluate new technology for the incubatees by comparing its profit with that of the old or established technology. The technology is proposed by a technology provider, which in this case is a university. In the technology selection activity, the distance between the technology level of incubatees and transferred technology should be considered. Unfortunately, there has been no effort to formulate a technology selection model in the technology incubator that considers the technology distance and is linked to the incubatees’ profit as financial performance. We examine the impact of the technological-level and technology assimilation rate in the technology selection process in the technology incubator. We analyse the external factor of customer acceptance of new technology with a probabilistic value and technology obsolescence. Furthermore, we introduce a profit-sharing scheme to share the profit of the incubatees with the university as a technology provider. Utilising a profit-sharing scheme means sharing the risk between incubatees and the university.     

关于啤酒有害菌培养方式的探讨

本文从伯杰氏细菌鉴定手册[1]整理出常见啤酒有害菌的所属科属及其生理生化特性,并对适合检出啤酒有害菌的方法进行了探讨。试验结果表明,二氧化碳培养箱可以用于啤酒常见有害菌的检出。     

The innovation incubator,university business incubator and technology transfer strategy: The case of Thailand

This study reviews the role of the innovation incubator and university business incubator (UBI) in supporting the entrepreneurial development in Thailand. The university business incubator (UBI) is defined in this paper as an incubator set up by the university to provide office space, equipment, mentoring services as well as other administrative supports to assist the formation of new ventures). In particular, the paper compares the operation of the university business incubators (UBIs) and technology incubators to understand their technology transfer strategies. The analyses, based on the Triple Helix model, also include the government policies to support innovation commercialization in Thailand. The study examines case studies of leading university business incubators (UBIs) (Mahidol University, Chulalongkorn University and King Mongkut's University of Technology Thonburi) and science and technology incubators of the National Science and Technology Agency (NSTDA) and the National Innovation Agency (NIA). The results have shown that the incubation program is one of the major policy mechanisms to support innovation and suggested that UBIs should act as an intermediary between the spheres of university and industry to provide interactive linkages and promote effective utilization of university research. The empirical study provides insightful implications on the move towards the entrepreneurial university and the dynamics of the Triple Helix system in stimulating innovation development and diffusion.     

三种便携式蓄冷保温箱在韭黄保鲜应用中的效果比较

韭黄是韭菜经过软化栽培的一种产品,但是易腐烂变质,本实验比较了三种蓄冷保温箱对韭黄的保鲜效果。以新鲜韭黄为试材,分别放入保温箱、组装箱和泡沫箱中,通过在箱中加入蓄冷剂,测定保温期间3种箱内外温湿度及韭黄品质的变化,比较3种蓄冷保温箱的保温能力和对韭黄的保鲜效果。结果表明,保温箱能有效保持箱内较低的温度和湿度,有效抑制了韭黄的失重、腐烂和转绿,保持了韭黄的抗坏血酸(V_C)和可溶性固形物(TSS)的含量,同时也保持韭黄良好的感官品质,相比较之下,保温箱可使韭黄的保鲜延长至4 d,组装箱内的保鲜可达3 d,泡沫箱内的保鲜仅为2 d,因此,保温箱具有较好的保温能力,能更好起到对韭黄的保鲜作用。      

科技企业孵化器绩效评价指标体系构建研究

综合采用多种数学方法,创新科技企业孵化器绩效评价指标体系,推动科技企业孵化器的评价由定性分析走向科学、有效的定量分析,为评价工作提供可借鉴的分析模式,对进一步规范和完善科技企业孵化器绩效评价具有重要意义。     

便携式蓄冷保温箱结构优化

通过对便携式蓄冷保温箱在PCM放冷时的传热情况进行实验跟踪,得出各点的T-t曲线,发现底部冷量损失严重.遂提出保温箱结构的优化方案,并用ANSYS模拟对各方案下保温性能做出理论验证.通过对保温箱各项性能指标与底部聚氨酯发泡层厚度的关系的推导,得出聚氨酯发泡层的增厚在增强保温性能的同时会减少保温箱的有效容积;而真空绝热板与聚氨酯发泡组合而成的复合保温材料可起到在不减少保温箱有效容积的前提下降低箱体冷负荷15.7%的效果.     

宽带互联网技术在科技企业孵化器中的应用

以一个科技企业孵化器的创业孵化服务信息平台开发为背景，阐述了基于宽带网的计算机互联网技术在科技企业孵化器中的应用，介绍了相关的设计和开发方法，提出了开发一个综合创业服务信息处理和管理平台开发所要解决的关键问题，把中小型科技企业孵化的概念引申到虚拟孵化和网络孵化。     

可装卸式蓄冷保温箱冷链运输效果

可装卸式蓄冷保温箱组装、拆卸方便,是蓄冷保温箱发展的趋势。本文实验研究了平菇的冷链运输效果,测定箱内空气温度、平菇中心温度和蓄冷剂温度变化,计算可装卸蓄冷箱冷链运输过程缝隙漏热率,每隔30 h对平菇取样进行感官评定,测定其营养指标变化。结果表明:当环境温度25℃时,56 h后蓄冷剂完全液化,比预计时间少8 h,表明蓄冷剂需求量的估算值偏小,可以使用系数修正法予以调整;可装卸式蓄冷保温箱缝隙漏热率达到12.97%,缝隙漏热量占比大,应优化组装工艺;实验60 h与0 h相比,感官评分下降3.53%,可溶性固形物含量下降5.9%;可溶性蛋白质含量下降4.2%;维生素C含量下降9.96%,实验过程平菇商品价值、营养价值变化不大。     

For whom size matters – the interplay between incubator size,tenant characteristics and tenant growth

The present study introduces a multilevel ‘fit’ perspective on business incubation to examine the link between incubator size and tenant growth. We suggest that the effect of incubator size on tenant growth is not universally positive or negative but is contingent upon (a) the size of the tenants’ venture team and (b) whether tenants are operating in a high-tech industry. Based on data from 276 tenants hosted in 67 business incubators in Germany, multilevel analyses provide support for our hypotheses. With its findings, the present study complements earlier incubator research and expands our knowledge on which types of business incubators are best suited to facilitate venture development.