改性粉煤灰的制备及表征

采用3.5MOL/L NAOH溶液,于95℃左右对灰样进行改性处理后,经X射线衍射(XRD)和红外(IR)分析,改性灰为P型沸石为主的混合沸石矿相。并做了附加水玻璃后对合成沸石的影响的研究,结果表明,在水玻璃-粉煤灰-NAOH溶液体系中,P沸石的衍射峰增强。     

Analysis of the polyethylene glycol glucosides and FA esters thereof by atmospheric-pressure ionization MS

Polyethylene glycol (PEG) glucosides (PEGG) and the PEGG esters of lauric acid were analyzed by atmospheric-pressure ionization MS (API-MS) with electrospray ionization. Straightforward mass characterization of the complex mixtures could be achieved without prior chromatographic separation. The constituents were identified on the basis of quasi-molecular ions. Individual components could be observed as protonated molecular ions [M+H]⁺ and/or as their NH₄ ⁺, Na⁺, or K⁺ adducts in positive ion mode. The mass spectrometric investigation showed that mixtures of PEGG consisted of monoglucoside, diglucoside, polyglucoside, and free PEG. The esterification product is a mixture of two types of nonionic surfactants: PEG-laurates and PEGG-laurates. The reasons for distortion of the quasi-molecular ion intensities and the stabilization of adduct ions were discussed. The rapid and highly sensitive API-MS analysis technique proposed here is well suited for direct characterization of complex mixtures and suitable for development as a routine analytical method.     

Electrical conductivity of polyblends of poly(1,4-phenylene vinylene) and poly(2,5-dimethoxy-1,4-phenylene vinylene)

Summary A series of polyblends of poly(1,4-phenylene vinylene), PPV, and poly(2,5-dimethoxy-1,4-phenylene vinylene), PDMPV, were prepared in film form from precursor polyblends of the respective sulfonium salt polymers, which were separately prepared from the respectivebis(sulfonium salt) monomers. The blend films were doped with I₂ at room temperature to obtain a wide range of electrical conductivities (10^–2 to 10²Scm^–1) depending on the blend composition. The higher the content of PDMPV in the blends the higher was the conductivity.     

等离子体煤气化反应器内部流动数值模拟及设计优化的初步研究

本文对一种等离子体煤气化反应器内部湍流、两相流动和燃烧化学反应等复杂流动现象进行了三维数值模拟 ,得出了其内部的温度分布、速度分布和组分浓度分布 ,在对计算结果进行分析的基础上 ,提出了等离子体煤气化反应器的一种优化设计方案 ,并对此方案进行了不同等离子体流速下的数值模拟和比较分析 ,以确定气流参数的最佳匹配 ;数值分析结果表明 :改进的设计方案和气流参数匹配提高了等离子体热源利用的效率和煤气转化的效率     

Flow regime, hydrodynamics, floc size distribution and sludge properties in activated sludge bubble column, air-lift and aerated stirred reactors

This paper presents a comparative study how reactor configuration, sludge loading and air flowrate affect flow regimes, hydrodynamics, floc size distribution and sludge solids-liquid separation properties. Three reactor configurations were studied in bench scale activated sludge bubble column reactor (BCR), air-lift reactor (ALR) and aerated stirred reactor (ASR). The ASR demonstrated the highest capacity of gas holdup and resistance, and homogeneity in flow regimes and shearing forces, resulting in producing large numbers of small and compact flocs. The fluid dynamics in the ALR created regularly directed recirculation forces to enhance the gas holdup and sludge flocculation. The BCR distributed a high turbulent flow regime and non-homogeneity in gas holdup and mixing, and generated large numbers of larger and looser flocs. The sludge size distributions, compressibility and settleability were significantly influenced by the reactor configurations associated with the flow regimes and hydrodynamics.     

Electrical properties of (Bi3.5La0.5)Ti3O12 thin-films prepared by liquid source misted chemical deposition

The ((Bi_3.5La_0.5)Ti₃O₁₂(BLT) thin-films used in this study were fabricated on a Pt(111)/SiO₂/Si(100) substrate by a Liquid Source Misted Chemical Deposition (LSMCD) technique. X-ray diffraction patterns showed that the BLT films were crystallized and no other phases were observed when annealed above 650 ‡C. Grain size and remnant polarizations increased with increase in the annealing temperature, while leakage current densities decreased. The remnant polarizations (Pr) increased from 2.0 to 4.8 and 19.0 μC/cm2 with increase in the annealing temperature from 650 to 700 and 750 ‡C, respectively. The BLT films annealed at 700 ‡C in O₂ showed a good fatigue resistance of reduced polarization by 10% after 10⁹ switching cycles when 9 V of bipolar voltage was applied at a frequency of 40 kHz.     

基于多目标优化的黔中区水资源配置研究

以黔中水利枢纽一期工程为研究对象,开展水资源优化配置研究。在分析黔中水利枢纽工程概况及水资源优化配置原则的基础上,建立了黔中水利枢纽工程水资源优化配置模型,采用多目标规划对模型进行求解,得出了2007,2015年和2020年水平年黔中灌区、贵阳市区以及安顺市区的水资源优化配置结果;同时,对供需平衡、经济效益和污水排放量3个指标进行了对比分析。该模型分析结果为黔中区水资源的配置提供了科学合理的依据。     

乐果合成釜故障分析及处理

通过增加底轴承来改变搅拌轴的临界转速,解决了乐果合成釜试车过程中震动较大的问题,达到了生产和工艺要求。     

连续移动床炼焦新工艺

本文论述了目前国内外连续移动床炼焦新技术的工艺原理，介绍了国外连续移动床炼焦新技术的工艺流程及特性，并对连续移动床炼焦新技术的经济技术指标和焦炭特性进行了评述。     

二水硫酸钙结晶过程研究进展

综述了二水硫酸钙结晶过程的最新研究进展,从各个角度介绍了外部条件对硫酸钙结晶的影响,以达到对二水硫酸钙结晶的各种技术有一种比较客观综合的理解和认识,对未来二水硫酸钙结晶过程的研究方向作了探讨。