反渗透处理稀土氨氮废水试验研究

根据稀土冶炼厂排放的碳铵沉淀洗涤废水的水质情况,采用NH4Cl和 NaCl模拟废水进行了反渗透可行性对比实验。模拟实验发现,在相同条件下反渗透对NaCl 较NH₄Cl 有着更高的去除率,而NH₄Cl 相对NaCl则有着更高的产水速率。实际废水试验结果表明,在恒定操作压力范围内回收率为65%的条件下,NH₄Cl浓度为2.85 g/L的碳铵沉淀洗涤废水经反渗透处理其NH₄Cl去除率为77.3%,可作为氨氮废水的预处理。对该废水处理成本进行了分析,得出其约为2.7元/m³,比相近浓度氨氮废水的氨吹脱处理成本节省约26%。     

Effects of tree size and spatial distribution on growth of ponderosa pine forests under alternative management scenarios

Forest ecosystems may be actively managed toward heterogeneous stand structures to provide both economic (e.g., wood production and carbon credits) and environmental benefits (e.g., invasive pest resistance). In order to facilitate wider adoption of possibly more sustainable forest stand structures, defining growth expectations among alternative management scenarios is crucial. To estimate the effect of tree size and spatial distributions on growth for forest structures commonly considered in uneven-aged forest stand management, large (0.2 ha+) plots were established in 14 uneven-aged ponderosa pine stands in eastern Montana. All study trees were stem-mapped and measured for diameter and 10-year sapwood and basal area increment. A generalized growth model was developed to predict both total and merchantable 10-year basal area increment for nine hypothetical stand structures [three diameter distributions (reverse-J, irregular, flat) × three spatial distributions (clumpy, partial clumpy, uniform)]. Results indicate that the size and spatial distributions of individual trees have a considerable effect on overall stand growth. The greatest total stand growth was in stands with reverse “J” shaped tree size distributions, while the greatest merchantable stand growth was in stands with “flat” diameter distributions and uniform spatial distributions. Through better comprehension of generalized uneven-aged stand growth dynamics, forest managers may better assess the effects of alternative stand structures on stand growth while providing forest stand structures that may be more resilient in a changing climate.     

The English football ground as a representation of home

Home refers to a number of locations and various meanings associated with it have been identified. However, research has been limited by a focus on house and traditional family. To expand our understanding, this study explored whether a secondary space, the English professional football ground, embodied the same meanings as other places called home. Web survey respondents confirmed, to some extent, their preferred football team's home stadium does represent home similarly. Three distinct aspects of the home emerged: general qualities of home, place attachment, and the importance of social interactions. Some aspects varied by length of team occupancy and season ticket holder status; but none differed by gender. Though the football stadium does represent some qualities of home, it was speculated this may be due to the unique connection to place that underlies English football. Future research should explore how the views of stadiums and other public spaces as home places vary across locales in order to identify how home differs from places to which we are attached.     

六自由度气锤振动技术与电磁斜面振动技术比较

六自由度气锤振动与电磁斜面振动是两种模拟产品三轴振动的振动技术。由于两种振动技术的机理不同,其对样品的振动影响也会有区别。本文研究讨论两种不同振动技术的不同特点,以及对不同产品的振动效果别,我们可以根据样品特点和测试需求,选择更合适的震动技术。     

OHS风险控制方法在烟气排放控制工程中的应用

介绍了烟气排放控制工程中OHS风险控制的方法,并以香港青山“B”电厂4X680MW机组排放控制工程（CPBEC）为例,阐述了目前国内外环保项目在OHS风险管理方面的差距和改进措施。     

XZKP型高效空塔喷淋烟气脱硫装置技术特点

介绍了XZKP型高效空塔喷淋烟气脱硫装置的技术原理、技术特点、中试及工业化试验的情况。该技术通过改进工艺和结构,在提高脱硫效率和脱硫剂循环利用率两项技术上成效显著,用户可在不增加装置投资的前提下,获得更高的效率和更低的运行成本。     

浅谈水质中氟化物的分析方法

经过长期的工作实践,笔者总结出能够大大提高水中氟化物测定效率及准确度的操作方法。即在使用离子选择电极法测量水中氟化物时,首先要保证试验用的去离子水的纯净度,同时确保电极清洗到260mv以上,再开始试验,最后在绘制标准曲线时保证斜率的绝对值在（58±1）之间。     

A statistical analysis of the carbon dioxide capture process

Post combustion carbon dioxide (CO₂) capture is one of the most commonly adopted technologies for reducing industrial CO₂ emissions, which is now an important goal given the widespread concern over global warming. Research on amine-based CO₂ capture has mainly focused on improving effectiveness and efficiency of the CO₂ capture process. Our research work focuses on studying the relationships among the significant parameters influencing CO₂ production because an enhanced understanding of the intricate relationships among the parameters involved in the process is critical for improving efficiency of the CO₂ capture process. This paper presents a statistical study that explores the relationships among parameters involved in the amine-based post combustion CO₂ capture process at the International Centre for CO₂ Capture (ITC) located in Regina, Saskatchewan of Canada. A multiple regression technique has been applied for analysis of data collected at the CO₂ capture pilot plant at ITC. The parameters have been carefully selected to avoid issues of multicollinearity, and four mathematical models among the key parameters identified have been developed. The models have been tested, and accuracy of the models is found to be satisfactory. The models developed in this study describe part of the CO₂ capture process and can help to predict performance of the CO₂ capture process at ITC under different conditions. Some results from a preliminary validation process will also be presented.     

影响脱硫系统运行经济性的因素及改进措施

分析了原烟气成分、脱硫剂石灰石等对脱硫系统运行经济性的影响,探讨循环泵组合投运和工艺参数控制对运行经济性的影响规律,提出改进湿法脱硫系统运行经济性的措施,为脱硫装置的节能、经济运行提供参考。     

基于微观仿真的同站台换乘站客流疏散研究

旨在对同站台换乘站的客流行为和规律,以及对车站乘客疏散时的情况进行分析和研究。通过建立同站台换乘站的微观疏散仿真模型,利用微观仿真软件VISSIM对某即将建成使用的同站台换乘站的仿真模拟,直观地对客流的疏散过程和疏散人群分布状况进行动态观察,通过改变模型的参数设置,考察不同情况下换乘站的换乘效率,得出提高换乘效率的措施和建议,并最终为换乘站的设施设计和运营管理提供辅助设计与决策支持。