等离子-MIG焊的研究进展

等离子-MIG焊是一种复合电弧焊接方法,具有较好的工业应用前景,目前已经引起国内外相关研究人员的重视.等离子-MIG焊是将两种不同焊接工艺——等离子弧焊和MIG焊的热源复合在一起,从而实现优势互补,提高焊接的效率和质量.介绍了国内外等离子-MIG焊的研究进展;分析了等离子-MIG焊的原理和特点;介绍了等离子-MIG焊接设备及其在国内外的应用,等离子-MIG焊接设备的结构和系统,等离子-MIG焊枪.最后针对当前等离子-MIG焊的应用前景,提出了复合焊接技术的研究方向.     

测量机器人GeoCOM接口技术的开发与应用

介绍了测量机器人(TCA2003全站仪)的一些强大功能,分析了其自带的GeoCOM(地理数据通信)接口技术的高级模式,在此基础上利用visual Basic 6.0语言和Access数据库,通过GeoCOM接口对测量机器人进行了二次开发,并应用于某水利枢纽加密控制网的自动观测.最后,通过平差计算得出了一些参考性结论.     

Risk Assessment for Ecological Planning of Arid Inland River Basins Under Hydrological and Management Uncertainties

The Shiyanghe river basin, an arid inland basin of northwest China, is taken as an example to analyze the risk for achieving the ecological planning objective in arid inland river basins under uncertainty conditions. Hydrology and management uncertainties that affect the accomplishment of ecological planning objective are analyzed quantitatively with the methods of Bayesian theory based Probabilistic model, scenario analysis and interval analysis. Bayesian probabilistic analysis method was used to analyze the hydrological uncertainties in the form of probability and interval distributions in planning period, while the scenario analysis method and interval method were used to analyze the managing uncertainties in the form of interval numbers. Instead of the ecological risk analysis, which for arid inland river basin, of studying the impact of environmental and human factor on ecological system, water resources and environment, we focused on analysing the possible impact of hydrological and management uncertainty factor on the ecological planning, and forecasting the degree of the completion under the uncertainty. Our study provided the probabilities of achieving ecological planning objective and the possible deviation of different scenarios. The more local water resources and higher level of local water resource utilization and management appeared to lead higher probability to achieve the ecological objective. This study can help environment and water resource managers and planner to formulate a rational planning for arid inland river basins under hydrological and management uncertainty.     

基于EFDC模型的长江下游码头溢油风险预测

为了更有效地预测溢油事故,建立了基于EFDC(environmental fluid dynamlics code)模型的长江下游南京段码头溢油事故影响的预测模型。研究结果表明:构建的二维水动力模型能够较为准确地反映研究区域风场、流场、复杂地形条件综合影响下长江溢油扩展和迁移运动的整体规律,油膜在研究区域降解较慢,溢油发生在落急时刻和西风风向时,油膜更早向下游扩散,对下游保护区的污染更严重。     

汾河二库大坝安全监测成果分析

汾河二库大坝为全断面碾压混凝土重力坝。在坝体、坝基及岸坡共埋设内、外观测测点 335个。本文就施工阶段内部观测的部分成果进行了整理分析     

Hydrocracking of Gudao Residual Oil with Dispersed Catalysts Using Supercritical Water-Syngas as a Hydrogen Source

Heavy oil upgrading is a very important process in the petroleum industry, but is very difficult because it has a high impurity content. A variety of heavy oil upgrading technologies have been developed in the world, including the catalytic hydrocracking process, which can process various heavy oils with a high yield of liquid products. Although this technology is one of the most widely used methods for upgrading heavy oil, the use of expensive molecular hydrogen is costly. The heavy oil upgrading technology with alternative hydrogen is very important. The catalytic hydroconversion of Gudao residue with different catalysts using water-syngas as an alternative hydrogen was investigated in this study. Hydrogen is provided in-situ for hydrocracking through the water-gas shift reaction (WGSR). The experimental results show that catalysts play a very important role in catalytic hydroconversion of Gudao residue using water-syngas as an alternative hydrogen. Addition of catalysts to residue was found to improve the distribution or properties of cracking products and inhibit the asphaltene or TI formation.     

泗南江水电站堆石坝混凝土面板防裂技术

泗南江水电站在混凝土面板堆石坝施工中,为防止混凝土面板产生裂缝,有针对性的采取了合理安排分期填筑高程及填筑断面,合理安排混凝土面板施工时间,优选混凝土原材料及施工配合比,作好混凝土的养护和防护待技术措施,取得了较好的效果.     

泗南江水电站面板堆石坝填筑施工质量控制

泗南江水电站面板堆石坝高115m,水库于2007年10月底开始蓄水.监测资料成果分析表明,大坝运行正常,蓄水期间渗水量很小,文章介绍泗南江水电站坝体填筑施工质量控制,总结一些经验和施工体会,供参考.     

ABR反应器对垃圾渗滤液的处理试验研究

ABR工艺在处理垃圾渗滤液中具有其他厌氧生物反应器所达不到的优点。尤其是对B/C低、氨氮浓度高、COD浓度高的废水处理,通过调节回流比、HRT、碱度等参数后,可以取得很好的处理效果。在本次实验中,HRT控制在18h后明显提高的垃圾渗滤液的可生化性及C/N,使ABR出水CODcr去除率达到75%,C/N为6.72,对后续好氧反应起到了重要作用。在调控一定回流比后,为提供厌氧氨氧化所需的电子受体NO-3和NO-2实现脱氮。反应器在经过120d的培养驯化,氨氮进水为460mg/L,ABR对氨氮的去除率稳定在80%。不同格室的厌氧颗粒污泥都得到很好的驯化并在其合适的环境中发挥各自的功能。     

断层的生长连接研究进展

生长断层往往作为沉积盆地的边界断层控制和影响着盆地的演化。 国外学者通过对野外断层位移量和断层长度的观测与分析,指出了断层的生长表现为断层位移量和断层长度的增加;断层生长和连接有 2 种方式;单条断层的生长表现为断层最大位移量与断层长度之间呈比例关系的常规生长模型,以及先进行断层长度的生长再进行断层位移量生长的补充生长模型。 断层生长后期在断层端的相互作用下发生断层的连接是形成大型断层的重要方式。 结合国内外研究现状,对断层生长研究的主要模型进行综述,并在此基础上讨论了断层生长连接的特点。