H3PW12O40-TiO2/膨润土光催化降解甲基橙的催化性能

通过溶胶凝胶制得H3PW12O40Ti(OH)4凝胶,并柱撑于膨润土层间制备了复合光催化剂H3PW12O40TiO2/膨润土。由XRD、SEM、EDS对制备的复合光催化剂进行表征测试表明,固载的H3PW12O40TiO2使膨润土层状结构发生明显变化,柱撑体H3PW12O40TiO2呈弥散状态,且TiO2为锐钛结构,催化剂为颗粒粒径大小不一、分布松散的复合材料。对甲基橙的H3PW12O40TiO2/膨润土光催化降解应用表明,掺杂的杂多酸使所制备的复合催化剂光催化活性得到了极大提高,在光催化体系下有较广的pH适应范围,且制备的催化剂具有良好的催化稳定性。在表征分析及应用实验的基础上,提出了H3PW12O40TiO2/膨润土的强化催化作用原理。     

从Larson指数分析无机阴离子对饮用水水质稳定性的影响

综述了自来水中硫酸盐、氯化物、硝酸盐和氟化物对水质以及人体健康的影响,提出了综合考虑以上四种阴离子的Larson指数,并通过Larson指数分析了绵阳市某地表水厂出厂水的水质稳定性.结果表明,各Larson指数均未达到腐蚀性水质的临界范围,该厂生产的自来水不会对输水管道及水质造成不良影响.     

ELID磨削预修锐与氧化膜成膜的影响因素

设计了蓝宝石ELID(在线电解修整)磨削工艺的实验装置和实验方案.基于电化学理论,建立了蓝宝石ELID磨削预修锐氧化膜形成的数学模型,定性分析了氧化膜的成膜过程,并通过磨削实验,研究了极间间隙、电压等工艺参数对预修锐时间的影响规律,揭示了氧化膜厚度和生长速率的变化规律,提出了基于厚度、粘附力和孔隙率,并考虑预修锐时间的氧化膜状态的评价表征方法,对极间间隙、脉冲频率、电压和砂轮转速等ELID电解加工参数进行了优化.实验获得最佳加工条件为极间间隙0.5 mm,脉冲频率90 kHz,电压120 V,砂轮转速1500 r/min.     

内花键齿形的振动辅助冷挤压细化晶粒的机理研究

为研究轴向振动冷挤压工艺中成形件组织演化规律,采用元胞自动机方法模拟了轴向冷挤内花键成形过程中毛坯的微观组织演化过程.发现施加辅助振动的冷挤工艺加工出来的内花键平均晶粒尺寸明显小于无辅助振动时的平均晶粒尺寸.通过正交试验,分析了振动频率、振动幅值和挤压速度对成形件微观组织的影响规律.方差分析的结果表明,振动幅值对齿根部位晶粒平均尺寸影响最显著,而对节圆与齿顶部位晶粒尺寸影响最显著的分别是振动频率和挤压速度;振动频率对成形件齿根和节圆部位的平均晶粒均匀度影响最显著,挤压速度对齿顶的晶粒均匀度影响最显著.对辅助振动参数影响晶粒细化的机理进行了总结.     

沙角C电厂点检移动App设计与开发

针对某电厂设备点检管理系统使用发展的情况,分析了点检系统移动终端App发展的趋势,设计和开发了一套适合电厂当前工作要求的基于安卓智能手机系统的App作为实际点检工作移动处理终端,不仅能够实现常规点检机要求的上传下载点检工作流程,还实现了在线情况下实时获取个人点检工作进行处理的功能.设计的App使用安卓系统自带的SQLite数据库建立了移动终端本机数据库,用于实现离线设备数据浏览和分析,设计了个人关注参数用于随时随地查看自动下载在移动终端本机的个人关注参数数据曲线进行对比分析.实际运行结果表明,该系统使用方便,信息获取便捷,可实时在线处理工作,显著提高了相关人员点检工作执行和设备缺陷处理的效率.     

Exploiting opinion distribution for topic recommendation in Twitter

The popular social networking service Twitter provides rapidly updated information and online trends, which enriches and benefits people's daily life. At the same time, how to find out the really interesting and relevant topics from the massive streams of tweets, to provide precise topic recommendation for users, becomes a challenging problem in the real world. Previous collaborative filtering methods give solutions to traditional recommendation tasks considering users' positive reviews to help recommend items. However, to the problem ‘what is interesting to whom’ in Twitter, positive opinions toward a topic do not imply that the user will be interested in it with high probability, for the user probably prefers to know those controversial topics or hot events with a large number of negative posts. In this paper, we exploit the characteristics of topical opinion distribution for improving the performance of recommendation. The experimental results on a real‐world Twitter dataset show that the proposed opinion‐distribution‐aware topic recommendation (ODA‐TR) approach outperforms the state‐of‐the‐art collaborative recommendation methods. © 2015 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.     

A regional construction R&D evaluation system for China

Expenditure on R&D in China’s construction industry has been relatively low in comparison with many developed countries for a number of years—a situation considered to be a major barrier to the industry’s competitiveness in general and unsatisfactory as regards industry development of the 31 regions involved. A major problem with this is the lack of a sufficiently sophisticated method of objectively evaluating R&D activity in what are quite complex circumstances considering the size and regional differences that exist in this part of the world. A regional construction R&D evaluation system (RCRES) is presented, aimed at rectifying the situation. This is based on 12 indicators drawn from the Chinese Government’s R&D Inventory of Resources in consultation with a small group of experts in the field, and further factor analysed into three groups. From this, the required evaluation is obtained by a simple formula. Examination of the results provides a ranking list of the R&D performance of each of the 31 regions, indicating a general disproportion between coastal and inland regions and highlighting regions receiving special emphasis or currently lacking in development. The understanding on this is vital for the future of China’s construction industry.     

Project competition intensity (PCI) in the construction market: a case study in China

In economic terminology, ‘competition intensity’ can be used to mirror to a certain degree the status of industrial competition in a specific market, while in the construction market, it particularly involves the part of project competition intensity (PCI). Based on a road project in China, two forms of PCI, overt and covert, are identified in this study. To lower project construction cost thus enabling better project tendering performance, clients can facilitate higher levels of overt PCI by tailoring their tendering procedures, whereas, through covert PCI project competitors can adopt anti‐competitive behaviours to attain the expected works. The difference between overt PCI and covert PCI indicates various practitioners' perspectives and impact on the levels of competition intensity in construction. The findings suggest a way to promote PCI studies in the future, and offer new insights into other parts of competition intensity in construction.     

社会管理创新视角下审视深圳社区规划

党的十八大报告指出"社会管理创新"应在改善民生和创新管理中加强社会建设。以社区为桥梁,将城市规划与社会管理有效结合,是实现社会管理创新的有效途径。在社会管理创新的视角下,研究整理和分析了深圳特区成立20年来社区发展特征、社区管理沿革以及社区规划与管理的实践成果,从社区规划的编制、实施与管理各阶段提出观点,建议社区规划与现有规划体系衔接,开展编制方法研究;与法定图则联动,增强社区规划的法律约束力;开展社区规划实施策略研究,完善管理机制,以期为我国社会管理创新开拓思路。     

暖通空调专业房屋建筑部分工程建设标准强制性条文简编

从暖通空调专业角度出发,对2000年《实施工程建设强制性标准监督规定》发布以来,房屋建筑领域现行工程建设国家标准和行业标准中与专业直接相关的235条强制性条文,按勘察设计、施工安装、验收、运行维护等进行划分,并进一步按专业方向合并技术要求相同的条文,删除“必须”等严格程度用词,省略一些具体内容,得到了本专业房屋建筑部分工程建设标准强制性条文简编.并就协调各标准强条、实现全面覆盖、强化强条编写方面进行了分析和讨论.