成渝城市群作为中国经济增长第四极,也是我国雾霾频发地之一,属于国家"大气污染防治行动计划"划定的大气污染重点控制区.加快清洁能源替代、构建清洁能源体系是成渝地区控制大气污染的有利依托,是建设"成渝地区双城经济圈"和实现"美丽中国"要求的重要支撑.以促进清洁能源替代改善空气质量为出发点,首先定量评估了成渝地区清洁能源资源禀赋、生产供给能力和利用现状,其次通过与京津冀等地区的比较分析了成渝地区清洁能源替代的前景,最后结合实际情况为成渝地区未来推进清洁能源消纳、加快能源结构调整、坚持大气污染源头防治等方面提出了对策与建议.

硝态氮/亚硝态型厌氧甲烷氧化(NOx-DAMO)过程在还原硝酸盐/亚硝酸盐的同时将甲烷氧化为二氧化碳,在全球碳氮循环中起着重要作用.从应用的角度看,利用NOx-DAMO原理进行环境中甲烷和氮素污染控制也值得关注.本文介绍了在MBR和MBfR等反应器中应用NOx-DAMO过程单独或与其他工艺联合处理模拟废水和实际废水的研究中,污染物去除速率和效率显示出了工程实用价值.指出基于NOx-DAMO原理开发垃圾渗滤液和填埋气协同处理工艺、煤层气厌氧生物氧化工艺的研究值得探索,其可能为无规模利用价值的生活垃圾填埋气和煤层气的处理提供低成本和环境友好的解决方案.今后的研究方向应该是在继续深入NOx-DAMO微生物的生理特性研究的同时,需要面向不同应用需求广泛开展工艺开发与优化研究.

为更好地实现对诸如制动盘等结构部件的固有频率在线检测,采用VB和MATLAB混合编程技术和内嵌集成功能强大且界面友好的“Live Report”Gcx图形显示控件,开发了锤击法固有频率在线检测系统.阐述了系统总体构成及设计思路,详细介绍了连击探测、参数设置、数据管理、图形显示优化和数据对比等关键技术.实际的应用表明:系统能准确地完成对诸如制动盘等结构部件的固有频率在线检测,并直观地给出合格性判定结果,且性能稳定、效率高、易于使用.

Compared with the traditional transfer path analysis(TPA)in frequency domain,the time-domain TPA can playback noises and their path contributions,and further analyze their sound quality,so that the noises and their path contributions can be understood and grasped more intuitively and comprehensively.Here,based on the structure-borne noise impedance matrix method and the airborne noise source substitution method,a time-domain TPA method was presented to analyze the automobile interior noise including structure-borne noise and airborne one,and its implementation process was illustrated in detail.Furthermore,a time-domain TPA model was built to analyze the copilot position noise caused by an engine.The results showed that the contribution of structure-borne noise is significantly greater than the contribution of airborne noise during the engin's whole run-up and run-down process,the right upper mount and the left upper mount are the main transfer paths and their higher path FRFs are the root causes of large contributions.The results pointed out a direction for the establishment of subsequent noise control schemes.

2 900 r/min and 3 750 r/min,the transfer path analysis based on the impedance matrix method was conducted and the condition number was restricted by setting a threshold to reduce ill-condition error.Results showed that the transfer paths corresponding to the x direction of the powertrain's right mount,the z direction of the powertrain's right mount and the z direction of the powertrain's rear mount are the main contribution paths to the booming noise at 2 900 r/min,the cause of big contribution for the former two is that they have a large exciting force,and that for the latter is that it has a high path sensitivity;the transfer paths corresponding to the x direction of the powertrain's right mount and the z direction of the powertrain's rear mount are the main contribution paths to the booming noise at 3 750 r/min,the cause of big contribution for the former is that it has a large exciting force,and that for the latter is that is has a high path sensitivity.These results provided a guidance for noise control and improvement of car's sound quality.