一体式氧化沟污水处理技术

陕西某污水处理厂采用A2/O一体式氧化沟工艺。该工艺集厌氧、缺氧、好氧、沉淀功能于一体[1],工艺流程短、占地面积少、土建设备投资费用低,抗冲击负荷能力强,除磷脱氮效果好,动力运行费用低[2],出水水质完全符合我国《城镇污水处理厂污染物排放标准GB18918-2002)》中一级B标准。     

火电厂粉煤灰选铁技术

粉煤灰既是发电厂排放出的一种废弃物,对环境特别是对水源和大气的污染严重,同时也是未充分利用的资源。对粉煤灰中铁的分选和利用,将提高粉煤灰的综合利用率,有较高的经济价值。     

一种矿井风门气动控制闭锁装置的设计

在煤矿井下作业时,行人、行车会对巷道通风系统产生一定影响,给职工生命安全带来威胁。文章设计了一种矿井风门气动控制闭锁装置,闭锁功能由控制部分、气缸及相关机械装置实现,同时该装置配备了红外线传感器监控与语音系统,能够实现自动互锁防止入风短路,并且具有风门开启灵活、方便、安全的特点。     

坪北油田油井复合解堵技术应用及效果评价

坪北油田属于典型的特低渗透油田,地层中的孔隙吼道基本以小孔隙吼道为主,注水开发常会出现油井附近地层的堵塞,降低地层的渗透率,阻碍油井正常生产。经过对导致油井附近地层堵塞的因素综合分析,坪北油田最终选择化学解堵剂与酸复配的复合解堵工艺。现场应用显示,本解堵技术效果明显,经济效益显著,有推广应用的前景。     

泥质板岩改良土无侧限抗压强度影响因素分析

文章分析了泥质板岩的化学成分和矿物成分,并提出用生石灰和水泥改良的方案,结合正交试验设计方法,对改良后混合料的无侧限抗压强度进行影响因素分析,确定了压实度、含水量、掺灰量、泡水时间等因素对无侧限抗压强度的影响权重,从而为改良方案提出更科学可信的方法。     

Does trade liberalization and its associated increased economic activity affect permanently the value and pattern of trade flows?

Despite a number of multi-country case studies based on a variety of analytical frameworks and numerous econometric studies using large cross-country data sets that analyse trade openness and its induced economic activities that alters both the volume and value of trade flows, there is still disagreement among economists concerning the nature of this relationship. In this article, we follow a rather unique approach by estimating the density functions of the observed trade flows and the density functions of trade flows generated by tariff removal using an intertemporal global Computable General Equilibrium (CGE) model. Our inquiry is whether or not the trade flows generated by global tariff elimination impact economies in the long-run and alter their historical underlying distributions. If the latter case prevails, it implies that the economies follow a different transitional path into a new steady-state equilibrium. The density functions, estimated parameters and higher moments of the observed trade flow distributions are distinctly different from the parameter estimates of the trade flows generated by the model. In this sense, trade-inducing economic activity as generated by tariff removal and captured by the neoclassical specification of the model is associated with trade flows along a different transitional path from the observed trade flows.     

双线自动闭塞区段最大量铺画货物列车运行线的研究

为了在客货共线运行图中有效利用旅客列车运行线两侧的空档,尽可能多地铺画货物列车运行线,以提高区段通过能力,在扣除系数表格计算法的基础上,按照附加扣除时间最少的原则,分析了在双线自动闭塞区段单列旅客列车和2列旅客列车两侧货物列车运行线的合理铺画方案。并通过应用实例给出了最大量铺画货物列车运行线的方法。     

非晶态Ni—P化学镀液的维护及不良镀层的退除

本文介绍了非晶态 Ni—P 化学镀液的维护和不良镀层的退除。     

粉煤灰制备白炭黑的探索性研究

初步探讨了用工业固废粉煤灰制备白炭黑的方法.依此法,粉煤灰经激活、酸浸、陈化、除杂等工艺,制备出SiO2纯度达91.7%的白炭黑,其化学式为SiO2·1/7H2O,品质标准符合HG/T3601.     

气动仪表试验台的设计与应用

摘要：本试验台不仅能检验电气阀门定位器,而且也能对其它气动仪表进行校准,如：气动差压变送器、气动压力变送器、气动温度变送器、气动调节器、气动记录调节仪、电气转换器、气动色带指示仪等等气动仪表的校准,应用范围十分广泛。