一种变权灰色组合预测模型在中长期电力负荷预测中的应用

提出了一种基于灰色理论的中长期负荷变权组合预测模型,通过分析负荷曲线走向,对不同变化趋势的阶段组合后建立不同的灰色模型分别进行预测,通过基于累加残差的变权组合预测得到最终结果,简单有效地将变权组合预测应用到电力负荷预测中.实例计算证明了该模型在中长期电力负荷预测中的有效性,该模型兼具了灰色模型的简单性和变权组合预测的精确性.     

河北南部电网TBC方式下AGC控制策略的研究

在华北、东北联网以后,河北南部电网的自动发电控制(AGC)采用TBC方式运行,AGC控制目标以及考核标准均发生变化,需要对AGC控制策略进行必要的调整,以保证系统的稳定、经济运行.文章分析了AGC在FTC和TBC方式下的功率调整情况以及在TBC方式下可能采取的控制策略,通过试验提出了河北南部电网AGC在TBC方式下的控制策略,即A1、A2组合调整策略,实际运行经验表明该控制策略满足TBC方式的控制要求.     

新型高压复合介质组合电容器

介绍了一种新产品——新型高压复合介质组合电容器的性能参数、结构特点、工艺难点和试验情况     

冰区输电铁塔设计的荷载组合

在2008年初的冰灾中,输电线路大量倒塔,按原有规范设计的输电铁塔成为冰区线路的薄弱环节。改进的做法是:根据2008年的行业新规范,结合工程实践,在增加塔重不多的前提下,合理选择荷载组合,使之能够适应复杂的气象及地形条件,为今后的输电线路安全运行提供比较可靠的保证。     

以构建现代职业教育体系为核心推进职业教育发展

分析现代职教体系与产业结构调整的关系,提出必须将培养更大规模和更高质量的技能型人才、高端技能型人才作为建立现代高职教育体系,促进职业教育发展的战略重点。要在现代职业教育体系下,根据地方现代化建设的要求,通过建立现代职业教育体系为经济社会发展做好人才和智力支撑。重点论述了现代职教体系中中高职的有机衔接。提出了以构建现代职业教育体系为核心,深入推进职业教育发展的几个主要措施。     

试论我国氧化铝工业的工艺思路

本文简单介绍了我国铝土矿的资源状况、氧化铝工业的现状及近几年氧化铝工艺所取得的重大科技成果。通过对成果的论述指出:我国氧化铝工业应尽快使铝土矿选矿技术产业化。现有氧化铝厂应尽快分离烧结法、拜耳法工艺,分别采用近几年的科技成果,最大限度的发挥两套系统的潜力,提高氧化铝产量。新建氧化铝企业则应采用选矿双流石灰拜耳法工艺。     

Application of Combined Ozone–Hydrogen Peroxide for the Removal of Aromatic Compounds from a Groundwater

Nitro and chlorobenzene compounds, which are widely used in dye industries, have been associated recently with groundwater contamination. Because of their potential toxicity and for taste and odor considerations, three main actions were undertaken to solve the problem. First, to follow the advance of pollution toward the wells, samples were collected automatically and analyzed using GC-MS. Results indicate that o-chloronitrobenzene was the main pollutant in concentrations ranging from 10 to 2000μg/L. Second, to monitor the drinking water quality, an on-line spectrophotometer was used to measure the optical density at 254 nm at the inlet and outlet of the plant. Third, the feasibility of using the O₃/H₂O₉ combination was determined at a 450 L/h pilot plant. Reduction of concentrations of chloronitrobenzenes from 1900 μ/L to less than 20 μg/L could be reached by the application of 8 mg O3/L and 3 mg H2O9/L with a 20-minute contact time. To avoid an eventual bacterial egrowfn in the network due to biodegradability of the oxidation by-products, sand and GAC filtration were tested after oxidation. An evaluation of the costs of these different treatments is also presented.     

论川东苟家场构造带天然气勘探

川东苟家场构造带石炭系天敢勘探累遭失利。分析钻探及探井测试资料，认为苟家场构造天然气充满程度不同，原因在于；构造两翼倾轴逆断层封闭性差，石炭系及上覆盖层破碎严重南端已缺失石炭系；氢此，认为家场构造的圈各地层－地垒背斜复合圈闭、志留系气源岩生成的天然气只能在狭２长的圈闭范围内由下向上，自北向南端多，聚集，因而控气范围有限，可能只在构造顶部有气。     

Sensitivity analysis of HIV infection response to treatment via stochastic modeling

This work focuses on the analysis of HIV infection dynamics during the initial stages of infection when the viral load is low and random fluctuations may have a significant effect on the dynamics of the disease. Deterministic models that describe the expected progress of the infection cannot be employed to predict the probability of infection establishment at the primary stage. Consequently, stochastic simulations are used to determine the probability of successful infection in an average patient. A stochastic model based on Gillespie's algorithm is derived which includes mutant species and employed to determine the sensitivity of HIV infection to different treatment strategies such as single therapy and combination therapy with various efficacy values. The effect of treatment latency on virus clearance probability is also investigated.     

Production of hydrogen through the coupling of dehydrogenation and hydrogenation for the synthesis of cyclohexanone and furfuryl alcohol over different promoters supported on Cu-MgO catalysts

Cu-MgO is found to be an efficient catalyst for the coupling reaction of furfural (FAL) hydrogenation and cyclohexanol (CyOH) dehydrogenation. This process is not only efficient in compensating the thermodynamic equilibrium constraints in the cyclohexanol dehydrogenation and improving the yields towards cyclohexanone but also is a economical route for the synthesis of furfuryl alcohol (FFA) and cyclohexanone (Cyone) as the process do not need any external pumping of hydrogen. The effect of incorporation of various promoters viz., Co, Zn, Fe, Cr, Pd and Ni in Cu-MgO over its activity towards this coupling reaction has been studied. Incorporation of Cr in Cu-MgO catalyst is found be an advantageous in enhancing the yields of both FFA and Cyone. All other promoters though found to show higher activity for the individual reactions of FAL hydrogenation and CyOH dehydrogenation, failed to do the same in their coupling reaction. The stabilization of active species (Cu⁺/Cu⁰) by Cr which also seem to increase the synergetic interaction between Cu and MgO as observed from higher dispersion of copper (from XRD results) and easier reducibility of copper oxide (from TPR results) seem to be the factors behind its higher activity over other promoted catalysts.