Antimicrobial Activity of Natural Agents against Saccharomyces cerevisiae

The antimicrobial (AM) activity of starch‐based films coated with linalool, carvacrol or thymol against Saccharomyces cerevisiae in vitro and/or inoculated on the surface of Cheddar cheese was investigated. In solid medium using the agar diffusion method and in experiments involving the inoculation of the microorganism on the surface of Cheddar cheese, all the films containing these AM agents in coatings demonstrated an inhibitory effect against S. cerevisiae. The results suggest that the overall inhibitory effect of linalool, carvacrol or thymol increased significantly (p ≤ 0.05) with the concentration of each of the AM agents in the film coating and that the response is linear in the concentration range of 1 to 5% (w/w) of the AM agent. Thymol had the highest AM efficacy followed by carvacrol, whereas linalool had the lowest efficacy amongst the three systems. The zones of inhibition in the agar diffusion test method at 25°C for S. cerevisiae were found to be 7.6, 7.1 and 6.1 mm for thymol, carvacrol and linalool at 1% (w/w) loading and 13.2, 12.2 and 11.2 mm at 5% (w/w) loading of the AM agents, respectively. The death rates of S. cerevisiae on Cheddar cheese wrapped in films coated with thymol, carvacrol and linalool and stored for up to 28 days at 15°C were found to be 0.044, 0.043 and 0.038 per day at 1% (w/w) loading and 0.077, 0.073 and 0.063 per day at 5% (w/w) loading of the AM agents, respectively. Copyright © 2011 John Wiley & Sons, Ltd.     

Modelling the Material Flow and Web Tension in the Vertical Form–Fill–Seal Packaging Process

Vertical form–fill–seal (VFFS) machines are widely used to form bags for packaging products such as confectionary and snack food. One critical component of the machine is the forming shoulder, which needs to manipulate, without damage, the packaging material from a flat state into a tube. Some models of the geometry of the shoulder are available and have been used to help with its design and manufacture. However, there currently exists no theoretical basis for determining the geometry of the forming shoulder needed to process particular packaging materials. This paper investigates the application of Euler's theory for material flow around cylinders to the case of forming shoulders used in vertical form–fill–seal systems. It is shown that the theory is indeed applicable, and an inequality relation between the measured coefficient of friction of the material and the forming shoulder parameters is established. It is further shown how this can be used to direct the design of a forming shoulder for a particular application. Copyright © 2011 John Wiley & Sons, Ltd.     

生命周期评价在整体包装解决方案中的应用

论述了包装生命周期评价的实施步骤和过程,为整体包装解决方案提供依据。在分析整体包装解决方案设计开发和生命周期分析的基础上,总结了方案设计应遵循的包装总成本最低、包装减量化和无毒无害、包装可重复利用或回收再生原则,提出方案设计应满足现代绿色物流和绿色包装制度对包装的要求及节能环保和低碳经济的要求。     

物流行业企业规模与创新对Tobin's Q的影响

选取了45家沪深两市上市的物流公司1993年到2009年年报数据作为样本,考查了企业规模和创新对Tobin'sQ的影响,并把年度作为控制变量,试图呈现在控制其他影响公司价值因素的前提下,验证不同规模的物流公司其R8LD投资对公司价值的影响效果.笔者采用的实证方法则是用Lindenberg&Ross(1981)首先提出的...     

甚短距离光互连模块技术的发展动态

甚短距离光互连技术作为一种突破铜线互连传输瓶颈有效方法,受到了广泛关注。半导体光学器件技术、高速化集成电路技术和光电模块封装技术作为实现光互连的关键技术发展较为迅速。首先阐述了垂直腔面发射激光器的电路模型,然后针对光信号发送模块介绍了预加重补偿技术以及开环方式稳定光功率输出技术,并对如何提高光信号接收模块带宽性能的电路技术进行了分析。其次结合光互连模块技术标准的发展,以NEC公司的实用化甚短距离并行光互连模块为例,对其光电封装技术进行了说明,最后就甚短距离光互连技术所面临的课题及发展前景进行了总结。     

GIS技术在现代物流信息平台中的应用研究

GIS技术下的物流配送系统具有高效、快捷、可视化等特点,对现代物流企业的发展至关重要。构建基于GIS的现代物流信息平台,其关键技术是数据和功能集成。针对现代物流配送的特征,分析和设计信息平台系统的专业GIS图层、数据库以及功能模块。通过建立基于GIS的物流信息平台,实现物流过程的可视化及其物流信息的有效整合,以提高流通效率,降低物流成本,促进现代物流发展。     

埋置型叠层微系统封装技术

包含微机电系统(MEMS)混合元器件的埋置型叠层封装,此封装工艺为目前用于微电子封装的挠曲基板上芯片(COF)工艺的衍生物.COF是一种高性能、多芯片封装工艺技术,在此封装中把芯片包入模塑塑料基板中,通过在元器件上形成的薄膜结构构成互连.研究的激光融除工艺能够使所选择的COF叠层区域有效融除,而对封装的MEMS器件影响...     

封装过程中LED芯片理想因子的实验研究

基于发光二极管（LED）参数的非接触检测的方法研究,测试研究了封装过程中LED的理想因子。探讨了影响LED理想因子的因素,测试了光致发光（PL）条件下不同LED的理想因子,对比了封装缺陷对于理想因子的影响。实验表明,结温与载流子注入强度是LED理想因子的关键因素,LED封装过程中的缺陷对理想因子具有显著影响,并且可以通...     

一种基于施加预应力的FBG封装技术

提出了一种操作方便、性能可靠的光纤Bragg光栅（FBG）传感器高温固化封装工艺。实验中,采用预应力施加装置对FBG施加轴向预应力,用高温固化剂将FBG固化封装于弹性衬底材料表面。测试结果表明,施加预应力高温固化封装的8个FBG传感器线性度均在0．999以上;波形无啁啾现象,对温度的响应灵敏度系数平均为2．05×10^...     

包装设计的性别定位研究

介绍了性别定位作为包装设计侧重点的原因。论述了文字、图形、色彩、立体造型(容器)和肌理等设计要素在包装设计中进行性别定位时使用的方法。分析了21世纪消费者性别定位重心由生理特征转向心理特征的原因。基于心理特征具体表现为性度,提出了包装设计的性别定位,必须依据消费者的生理特征与性度的组合才具有合理性。