Efficacy of neutral electrolyzed water for sanitization of cutting boards used in the preparation of foods

The effectiveness of neutral electrolyzed water (NEW) to sanitize cutting boards used for food preparation was investigated. Cutting boards made of hardwood and bamboo were inoculated with Escherichia coli K12 and Listeria innocua, dried for 1 h, washed, rinsed and sanitized with NEW, sodium hypochlorite (NaClO) solution, or tap water (control). After each washing protocol, surviving bacterial populations were determined. Results showed that both NEW and NaClO sanitizing solutions produced similar levels of bacterial reductions. In manual washing, the population reductions by NEW and NaClO were 3.4 and 3.6 log₁₀ CFU/100 cm² for E. coli, and 4.1 and 3.9 log₁₀ CFU/100 cm² for L. innocua, respectively. In the automatic washing, the reductions by NEW and NaClO were 4.0 and 4.0 log₁₀ CFU/100 cm² for E. coli, and 4.2 and 3.6 log₁₀ CFU/100 cm² for L. innocua, respectively. No significant differences (P > 0.05) were observed in surviving bacteria counts when comparing board material types.     

Using new technologies for stimulating interpersonal communication on HIV and AIDS

Part of the current academic discourse on primary HIV and AIDS interventions, is focussed on the importance of interpersonal communication. Interpersonal communication is believed to mediate campaign effects through the creation of social learning environments. Therefore, many HIV and AIDS strategies (e.g. entertainment education programmes) use mass media channels for conveying messages on the one hand and spurring interpersonal communication among target groups on the other hand. However, it seems hard to find solid evidence that mass media campaigns are able to stimulate interpersonal communication. Simultaneously, there is a rising interest in the use of new technologies for HIV and AIDS prevention. As a result of their unique characteristics, such as interactivity and anonymity, they could be more appropriate than traditional channels to stimulate interpersonal communication. To gain insights in the challenges and opportunities of new technologies for primary HIV/AIDS prevention, this article presents the findings of a case study carried out at the University of the Western Cape. This study aimed at developing, implementing and evaluating an anonymous online discussion platform for students to share experiences and discuss sensitive subjects. The discussion forum was used in three ways: compulsory (through curriculum integration), semi-voluntarily and voluntarily. An extensive evaluation provided strong evidence that the online discussion forum was only successful when formally integrated into the curriculum. The most important opportunity of the formally integrated online forum relates to the creation of a social learning environment. The anonymous character of the online platform allayed fear for stigma and discrimination and removed cultural barriers concerning the inappropriateness of discussing HIV/AIDS related issues. As a result, the platform created a space in which students discussed freely, considered old and new ideas, acquired knowledge, and learned to esteem varying views on the subjects of discussion. Although no assertions can be made on the effects of these outcomes on sustainable changes in attitudes or behaviour, these findings indicate that participating in an anonymous online platform can instigate students to reflect on HIV/AIDS in a different way.     

含硫化氢天然气安全防护若干问题探讨

以重庆开县12.23事故发生为例,对我国含硫天然气安全防护技术标准体系的发展现状进行了分析,并以含硫天然气生产作业现场的危害分析为切入点,就生产作业场所员工安全防护有关问题进行探讨,提出相应的指导意见,以此推动和完善含硫天然气安全防护工作。     

基于激光传感器的蜜胺板检测系统研制

蜜胺板广泛用于印制电路板钻孔加工中的垫板辅料,随着机加工精度的要求越来越高,蜜胺板厚度在线精确检测成为迫切需要。针对蜜胺板厚度的自动在线检测系统的开发问题,采用非接触式的位移传感器,研制了基于激光三角法的蜜胺板测厚系统。系统借助DELPHI开发了控制系统的上位机操作管理软件,对采集卡和外围辅助装置的指令实时传输、处理。研制的蜜胺板测厚系统操作简便,有较强的可靠性和运行效率。现场应用表明,该测厚系统对蜜胺板厚度的测量精度达0．01mm,测量范围为0—10mm。     

园林、景观与中国风景园林的未来

通过分析园林、景观、风景园林等几个术语的缘起、演变和优缺点,指出综合性是风景园林学科的突出特性,而中国风景园林有着自己以辩证的综合性思维和实事求是方法为传统的特长.在摆脱封闭守旧文化环境的羁绊和掌握现代科技发展的成果后,中国风景园林必将超越以个人表现和分裂式思维为特征的所谓西方工业时代景观设计,再创辉煌.     

基于图像识别的侗锦纹样交互设计探讨

信息化的今天,学科交融,技术不断介入艺术中,民族艺术以新形式取得了新的发展,因此民族织锦与科学信息技术融合创新能够推进民族织锦发展与传承。以侗锦为例,讨论侗锦应用和数字化研究现状并分析目前存在的问题,进一步提出转化传承形式,活化侗锦的传承思路,并结合国内外文献研究和技术调查,对图像识别技术进行简要介绍和分析,阐述现有侗锦数字化应用和研究成果,在此基础上找到本次研究的切入口。分析侗锦和图像识别的跨界原因,并用现有服饰和织锦识别类案例成果分析说明侗锦与图像识别结合的可行性,重点在于构思识别后的侗锦进行交互设计的问题,旨在更好地促进非物质文化遗产——侗锦的创新传承。     

废弃电路板真空热解产物特性分析

采用真空热解对废弃电路板进行热解实验,利用FT-IR分析、GC/MS、SEM等技术对真空热解液体、固体及气体产物进行了分析表征,研究了不同真空条件和温度下对热解产物的组成和理化特性.结果表明,液体产物的密度会随着真空度的变化发生改变;在不同真空条件下,产物的组成也有不同,并分析其产生的原因.为进一步探讨废弃电路板的真空热解产物特征提供参考.     

印制线路板酸性镀铜组合添加剂的工艺性能

目前,酸性镀铜难以满足高端PCB生产需要,在酸性电镀溶液中加入组合添加剂FX-203制备电镀铜层,采用霍尔槽法、电化学、SEM和XRD等研究了该添加剂对镀层质量、镀液性能的影响。结果表明：随着FX-203加入量的增大,镀层光亮区和镀液分散能力先增大后减小。该体系适宜的工艺条件：75g／L CuSO4·5H2O,180g...     

分段加热对废旧线路板熔焊影响的数值模拟

近年来电子产业发展正存在着消耗量大、消耗快速、浪费严重等不利情况.在电子废弃物中,废旧手机芯片仍具有一定的剩余寿命,拥有较高的再利用价值.因此在废旧手机的拆解过程中提高拆解效率以及降低对芯片的损害是十分有必要的.针对废旧手机线路板上电子元器件拆解过程中常见的熔焊问题,以空气为加热介质,BGA返修台为加热工具,并采用FL...     

废弃电路板破碎产物粒度分形分布的研究

废弃电路板破碎产物的外观形貌具有统计意义的自相似性,表现出分形的特征,建立了废弃电路板破碎产物粒度分布的分形模型.应用Origin 7.0软件对18种不同实验条件下得到的筛下累积产率曲线进行函数拟合,得到的拟合结果和实际结果相关性较好,残差E值较小,说明分形维数D是反映废弃电路板破碎程度恰当的统计特征量,可作为评价废弃电路板破碎程度的重要参量.采用Design Expert 6.0.8软件建立了分形维数D和破碎实验操作条件之间的二次方模型,标准偏差为0.022 706,且二次方模型得到的预测值和实际值非常接近,残差、平衡值、学生化残差、库克距离和奇异点距离均能达到预测精度的要求,为废弃电路板的湿法高效冲击破碎提供了基础.