Modeling and monitoring of long-term acidification in an upland catchment of the Western Ore Mountains,SE Germany

Modeling and monitoring of acidification patterns in a limed forest catchment in the Ore Mountains, SE Germany are presented. A lumped-parameter model, MAGIC, satisfactorily reproduced the main parameters of stream water chemistry. Despite repeated whole-catchment liming, between 1993 and 1999 stream water pH increased from 4.3 to only 4.6, while calcium concentrations declined slightly. Stream water sulfate concentration declined from 687 to 396 microeq l(-1), and the pronounced effect of deposition decline during the 1990s was probably more important than liming.     

The extinguishment of fires using low flow water hose streams—part II

Fire extinguishment tests were conducted in a simulated shipboard space. Portable extinguishers, a low flow water hose reel system, and 3.8 cm diameter water hand lines were used to extinguish the fires. Various protective ensembles were used by the fire fighters, ranging from minimum protection to full protection. Personnel with both a limited and high degree of fire fighting experience were used. Response time was influenced by visibility and the fire fighters' knowledge of the compartment. The low flow water hose reel system was found to be an effective and efficient quick response fire fighting tool. Efficiency, in terms of total water used, was better with the hose reel system compared to the larger, higher flow water hand lines.     

三轴深层搅拌桩止水帷幕在某基坑支护工程的应用

文章以某大楼基坑支护工程为例,主要介绍了三轴深层搅拌桩的施工工艺及质量保证措施,供类似工程参考。     

热泵型热水器的应用及市场前景

介绍了热泵热水器的工作原理和热效率,以及应用与市场的前景。     

地表水处理中的好氧反硝化

对地表水处理中的好氧反硝化进行了探索性研究，在水力负荷较高的情况下取得了良好的效果（对氮的去除率为20％－30％），还根据试验结果对好氧反应化的机理作了补充和修正。     

直燃机冷却水变流量运行的可行性研究

直燃式溴化锂吸收式冷热水机组冷却水系统耗能占机组总能耗的60%以上,而部分负荷时冷却水供、回水温差仅为1~2℃。分析了冷却水变流量运行的可行性,冷却水变流量运行可降低溶液结晶和冷剂水受污染的可能性。在采用冷却水变流量运行时,应通过改进能量控制系统避免天然气燃烧量的增加。     

回路控制法——新的空调变频水系统控制方法

分析比较了空调水系统中定末端压差控制和最小阻力控制方法的优缺点,结合基本回路方法提出了能够解决这些缺点的新的控制方法--回路控制法,通过MATLAB软件计算表明这种控制方法能够很好地解决管网水系统的解耦问题,明确了新的控制方法的节能及调节质量优于原有方法.     

太阳能热水器防冻解冻的新方法

提出在太阳能热水器上下水管的下端安装电热水器的方法,防止管内结冰和解冻。     

水泥土墙复合支护方案的应用

针对兴化市供电公司生产调度综合楼基坑支护工程的特点,结合场地地质条件和场地环境,分别采用格栅式水泥土墙支护和水泥土桩防渗、放坡开挖的复合支护方案进行处理,既保护了周围环境,又节省了工程造价。在提出支护处理方案的基础上,侧重论述水泥土墙复合支护结构的设计施工要点和质量控制。     

空调水系统变流量节能控制(续1):水流量变化对空调系统运行的影响

分析了一级泵水系统采用温差控制法实现变流量运行对空调系统运行的影响。认为变流量运行不会对冷水机组和末端装置产生影响。根据变流量系统使用场合的不同。提出了相应的控制策略。