后掺粗骨料工艺对高性能泵送混凝土性能影响研究

为解决建筑工程中高性能泵送混凝土的环境问题、成本问题,基于粗骨料嵌锁效应和界面水灰比强度理论,在保证高性能和泵送要求的条件下,提出了后掺骨料工艺,并对不同粗骨料后掺比例下的混凝土进行了力学性能和抗冻性能的研究。结果表明,随着粗骨料后掺比例的增大,7 d、28 d混凝土抗压强度持续增大,而28 d混凝土劈裂抗拉强度和抗折强度均呈先增大后减小的趋势;在冻融循环作用下,质量损失率的上升速率呈先减小后增大的趋势,而抗压、抗拉、抗折强度、动弹性模量以及超声波速的下降速率均呈先减小后增大的趋势。据此建议本C30高性能泵送混凝土的粗骨料最佳后掺比例为20%。     

如何降低汽车涂装过程造成的污染

本文围绕汽车涂装过程中使用的涂装材料、涂装工艺及设备,阐述了降低汽车涂装过程中造成污染的措施,指出采用低污染材料、先进的生产设备,并优化生产工艺,是解决汽车涂装“三废”问题的有效途径。     

Effects of individuals' locus of control and computer self-efficacy on their e-learning acceptance in high-tech companies

High-tech companies encounter intense competition in today's global economy. With rapid changes in working environments, high-tech employees must learn quickly and effectively to solve difficult problems and increase their productivity. Many large high-tech companies have recently implemented electronic learning (e-learning) for employee training. However, e-learning systems are expensive and often underutilised. Therefore, understanding the factors associated with acceptance to e-learning are of priority concern. By integrating locus of control, computer self-efficacy and technology acceptance model (TAM) into one model, this study examines the feasibility of the extended TAM to explain employee acceptance of e-learning systems. Data were collected from 223 employees at five high-tech companies located in the Hsinchu Science Park, Taiwan. Analytical results indicate that locus of control had significant direct effects on perceived usefulness and perceived ease of use. Computer self-efficacy had significant direct effects on perceived ease of use and behavioural intention to use. Overall, analytical results provide strong support for using the extended TAM to explain user acceptance of e-learning systems. The research and practical implications of findings are discussed.     

闪蒸技术在氯化铵生产中的应用

将闪蒸技术应用于氯化铵溶液的蒸发浓缩与冷却结晶,即利用动力蒸汽通过喷射泵,使闪蒸器中氯化铵溶液压力降低,闪蒸产生水蒸气而蒸发去除水分。同时由于闪蒸水蒸气吸收溶液自身热量,从而使溶液冷却结晶析出氯化铵晶体。生产实践证明,闪蒸技术应用于氯化铵溶液蒸发与冷却结晶,彻底解决了氯化铵生产中存在的结垢问题,提高了生产效率。     

Enabling customers engagement and collaboration for small and medium-sized enterprises in ubiquitous multi-channel ecosystems

Over the last few years, we have encountered an exponential growth in online communication opportunities. Organizations have more and more ways to connect and engage with their current or future customers. The existence of more opportunities in connecting to people can be both an enabler and a burden. Being present at a multitude of different channels requires the effective management of a very large number of adapted contents, formats, and interaction patterns fulfilling the communication and cooperation needs of distributed target groups. In this respect, we integrate existing fragmented communication and monitoring approaches into a full-fledged communication model as a basis for an adequate engagement approach. We describe applications of our approach in both the eTourism and manufacturing domain. In this paper, we introduce an approach that will enable communication, collaboration and value exchange of users through a multitude of online interaction possibilities based on the use of semantic technology. Finally, we also compare our approach with existing solutions with respect to the identified challenges in this subject.     

光气生产技术及光气化产品开发进展

综述了光气生产工艺技术、安全措施及主要光气下游产品种类。介绍了国内外光气生产及应用现状，涉及一氧化碳制备、氯气干燥、光气合成、废气处理和安全生产等技术。简述了光气化产品开发研究方向，提出重点开发IPDI(异佛尔酮二异氰酸酯)、NDI(1，5-萘二异氰酸酯)、氯磺酰异氰酸酯和较大分子量的氯代甲酸酯等光气化产品。     

二甲醚生产技术及应用前景

介绍了二甲醚的生产技术、主要用途和研究进展，并对其应用前景做了展望。     

国外陶瓷球加工技术及其应用

主要综述了国外陶瓷球的加工技术，加工陶瓷球使用的设备，研磨介质和研磨料的选择，介绍了陶瓷球及陶瓷球轴承的应用发展概况。     

端面粘贴包覆火药界面粘结强度研究

包覆火药装药控制燃气生成速率，降低弹性温度系数，提高弹丸初速的效果部分来自于包覆层的作用，对预制包覆层端粘包覆火药，其包覆层的厚度，密度，强度等性能已根据弹道和装药表确控制，包覆层与基药的界面粘结度就决定了包覆层控制燃气生成速率的有效性和可靠性，它是检验端面粘贴包覆火药工艺质量的关键指标，本文采用落锤实实验检包覆火药的界面结强度，研究了粘结工艺条件对端面粘贴包覆火药界面粘结强度的影响，通过实验选择出了合适的粘结剂及粘结工艺条件，制备了界面粘结强度良好的端面粘贴包覆火药。     

卧式一步法丙纶高强丝生产工艺研究

在意大利ＦＡＲＥ公司卧式一步法丙纶高强丝设备上，研究了聚丙烯熔融指数与丙纶高强丝强度的关系。探讨了纺丝温度、冷却条件、单丝纤度、拉伸倍数等主要工艺条件对丙纶高强丝强度的影响。