FMEA在乳化炸药螺杆泵中的应用

以乳化炸药螺杆泵为研究对象,画出系统功能方框图和可靠性方框图,应用故障模式及影响分析方法(FMEA),确定螺杆泵的各种可能故障模式、故障原因和故障影响。同时计算出各故障的风险度,并依次对故障进行分级,找出对螺杆泵危害严重的故障。最后建立FMEA表格,并根据分析结果提出提高其可靠性的建议措施。     

The dynamic links among energy consumption,tourism growth,and the ecological footprint: the role of environmental quality in 38 IEA countries

Environmental Science and Pollution Research - We examine the impact of energy consumption and tourism growth on the ecological footprints and economic growth of 38 International Energy Agency...     

硫化砷渣全湿法制备单质砷的研究

以硫化砷渣为原料,用氯化铜酸性溶液浸出砷渣的全湿法进行实验,着重研究氯化铜浸出砷的过程中氯化铜用量、溶液p H和浸出时间对砷浸出率的影响,探讨用氯化亚锡还原砷盐酸溶液从硫化砷渣得到单质砷的方法。     

室内空气污染对人类健康的影响及防治措施

本文通过论述第三污染源室内空气污染对人类健康的危害,并提出了主要防治措施。     

基于系统动力学模型的清河流域产业结构优化研究

基于清河流域近年的"经济-社会"现状特点与发展趋势,以2010年为水平基准年,建立清河流域产业结构优化SD模型,将整个系统分为人口及生活子系统、经济子系统、用水子系统和污染物子系统。设置四种情景方案进行模拟,模拟时间为2010年到2020年,通过各个方案结果对比分析选出方案四为最优方案。并根据最优方案提出清河流域产业结构优化的建议,从而为清河流域经济的健康可持续发展提供科学的决策依据。     

Triboelectric charging behavior of wood particles during pellet handling processes

Electrostatic charges accumulated on wood particles through triboelectrification during their transportation and handling processes can cause hazardous electrical discharge which may further trigger dust explosion. In this work, tribo-charging behavior of different kinds of wood particles was investigated by a vibrating plate charging method. It was found that reduction in the work function difference between contact bodies might contribute to the reduction of tribo-charge generation, while the reduction of electrical resistivity of wood pellets could effectively accelerate the charge dissipation. As the particle size decreases, accumulated charges increase significantly. In contrast, higher moisture content of wood particles leads to lower charge accumulation due to an accelerated charge dissipation rate. Tribo-charging behaviors of white pellets, torrefied pellet, steam treated pellets and dark pellets have also been investigated. Compared to the white pellets, they all have shown a reduction on charge accumulation to some extent. However, results suggested that all of them have nearly equivalent tribo-charge density as coal and wheat grains used as references in this study.     

Study of the Optimization and Adjustment of the Industrial Structure Subjected to Water Resource in the Drainage Area of the Yellow River

Abstract

Since the 1990s, the Yellow River stream has been temporarily interrupted for several years, which affects the development of society, the economy and human life, limits the economic potential of the drainage areas, and especially causes great harm to regions on the lower reaches. Based on the analysis of the relationship between the development of society and economy and water scarcity, the author thinks it is necessary to optimize and adjust the industrial structure that has extravagantly consumed enormous amounts of water, and to develop ecological agriculture, industry and tourism which are balanced with the ecological environment. Finally, the author puts forward several pieces of advice and countermeasures about how to build the economic systems by which water can be used economically.     

Spatial assessment for groundwater quality based on GIS and improved fuzzy comprehensive assessment with entropy weights

The objective of the research is to evaluate spatial groundwater quality based on improved fuzzy comprehensive assessment model with entropy weights(FCAEW)in geographical information system(GIS)environment.This paper explores the method of comprehensive evaluation of groundwater and sets up an evaluation model applying GIS and FCAEW.Groundwater samples were collected and analyzed from 29 wells in Zhenping County,China.Six parameters were chosen including chloride,sulfate,total hardness,nitrate,fluoride and color.Better spatial interpolation methods for evaluated parameters are found out and selected according to the minimum cross-validation errors from the interpolation methods.FCAEW model was carried out with the help of GIS which makes the evaluating process simpler and easier and more automatically,effectively,efficiently and intelligently.The result embodies the feasibility and effectiveness of FCAEW in GIS when compared with other comprehensive evaluation methods.     

Characteristics of atmospheric single particles during haze periods in a typical urban area of Beijing: A case study in October, 2014

To investigate the composition and possible sources of particles, especially during heavy haze pollution, a single particle aerosol mass spectrometer (SPAMS) was deployed to measure the changes of single particle species and sizes during October of 2014, in Beijing. A total of 2,871,431 particles with both positive and negative spectra were collected and characterized in combination with the adaptive resonance theory neural network algorithm (ART-2a). Eight types of particles were classified: dust particles (dust, 8.1%), elemental carbon (EC, 29.0%), organic carbon (OC, 18.0%), EC and OC combined particles (ECOC, 9.5%), Na-K containing particles (NaK, 7.9%), K-containing particles (K, 21.8%), organic nitrogen and potassium containing particles (KCN, 2.3%), and metal-containing particles (metal, 3.6%). Three haze pollution events (P1, P2, P3) and one clean period (clean) were analyzed, based on the mass and number concentration of PM_2.5 and the back trajectory results from the hybrid single particle Lagrangian integrated trajectory model (Hysplit-4 model). Results showed that EC, OC and K were the major components of single particles during the three haze pollution periods, which showed clearly increased ratios compared with those in the clean period. Results from the mixing state of secondary species of different types of particles showed that sulfate and nitrate were more readily mixed with carbon-containing particles during haze pollution episodes than in clean periods.     

上海市用水量与经济发展的关系研究

选取上海市1998～2006年的用水量、经济数据,通过人均GDP与人均用水量之间的关系,探索上海市用水量与经济发展是否存在环境库兹涅茨曲线关系,剖析上海市经济增长与用水量的演变规律,结果表明：上海市经济增长与用水量之间不符合一般的环境库兹涅茨曲线特征,重新建立了曲线模型,通过模型计量分析,人均总用水量,人均农业用水量,人均生活用水量与人均GDP曲线均为“U＋倒U”形,而人均工业用水量人均GDP曲线为“倒U＋U”形,为合理开发上海市水资源提供较为科学严谨的依据。