Mesh parameterization based on edge collapse

Parameterizations that use mesh simplification to build the base domain always adopt the vertex removal scheme. This paper applies edge collapse to constructing the base domain instead. After inducing the parameterization of the original mesh over the base domain, new algorithms map the new vertices in the simplified mesh back to the original one according to the edge transition sequence to integrate the parameterization. We present a direct way, namely edge classification, to deduce the sequence. Experimental results show that the new parameterization features considerable saving in computing complexity and maintains smoothness.     

储存尿液电化学法脱氮的影响因素

生活污水中约 80% 的氨氮来自尿液,收集尿液并脱氮处理可极大减轻生活污水处理负荷.本实验用Ti/RuO₂-TiO₂ 电极作为阳极,不锈钢板作为阴极,在有机玻璃电解槽中研究考察电流密度(20~100 mA/cm²)、储存尿液初始 pH(9~12) 以及 NaCl 投加量(4~16 g/L) 对储存尿液(250 mL)的脱氮效果.结果表明,最佳脱氮工艺参数为:电流密度 80 mA/cm², 初始 pH 在 11 左右,NaCl 投加量为 8 g/L,电解时间达到 270 min.在此最优化条件下,氨氮和总氮的去除率分别是91.83%和88.34%;处理 1 L 尿液消耗 0.311 kW·h 电能.可见,该方法具有快速、低能耗、高效优点,在源分离尿液氮处理方面具有应用前景.     

简易湿法脱硫除尘一体化装置在220t/h煤粉锅炉上的应用

在220t/h煤粉锅炉延期脱硫改造中,应用简易湿法脱硫除尘一体化装置,占地少,投资小,工期短,脱硫效率较好,运行费用较低且无副产品处理,取得了较好效果.     

煤中添加 NH4 Br 对气相汞氧化脱除及脱硝的实验研究

为脱除烟气中的气相汞和 NOx,进行了贵州无烟煤中添加 NH4 Br 对烟气汞氧化脱除协同脱硝的实验研究．在热重分析仪上研究添加 NH4 Br 对着火温度和燃烧特性的影响．在6 kW 流化床燃烧（FBC）试验装置上研究了在煤中不同 NH4 Br 添加量对气相汞氧化脱除的影响．采用安大略法（OHM）对烟气中汞形态浓度进行了测定并得出汞质量平衡．结果表明,添加 NH4 Br 对贵州无烟煤的着火温度没有影响．原煤燃烧汞质量平衡率为95．47％,颗粒汞 Hgp、气态 Hg0和 Hg2＋比例分别为75．28％,11．60％,13．12％．由于飞灰中含有较高的未燃尽碳,烟气中 Hgp 浓度较高．随着 NH4 Br 添加量从0增加至0．3％,烟气中气态 Hg0和 Hg2＋减少,Hgp 相应增加．Hg0的氧化率与煤中 Br 的添加量成正相关．这表明煤燃烧中添加 NH4 Br 可促进 Hg0的氧化和脱除．烟气中 NOx 随着 NH4 Br 的添加呈减小趋势,其脱除率在0．3％添加量时达最大（17．31％）．添加 NH4 Br 同时具有协同脱硝的作用．     

Performance of biological phosphorus removal and characteristics of microbial community in the oxic-settling-anaerobic process by FISH analysis

Performance of biological phosphorus removal in the oxic-settling-anaerobic （OSA） process was investigated. Cell staining and fluorescent in situ hybridization （FISH） were used to analyze characteristics and microbial community of sludge. Experimental results showed that phosphorus removal efficiency was near 60% and the amount of biological phosphorus accumulation in aerobic sludge of the OSA system was up to 26.9 mg/g. Biological phosphorus removal efficiency was partially inhibited by carbon sources in the continuous OSA system. Contrasted to the OSA system, biological phosphorus removal efficiency was enhanced by 14% and the average total phosphorus （TP） contents of aerobic sludge were increased by 0.36 mg/g when sufficient carbon sources were supplied in batch experiments. Staining methods indicated that about 35% of microorganisms had typical characteristics of phosphorus accumulating organisms （PAOs）. FISH analysis demonstrated that PAOMIX-binding bacteria were predominant microbial communities in the OSA system, which accounted for around 28% of total bacteria.     

Simultaneous removal of ethyl acetate,benzene and toluene with gliding arc gas discharge

The simultaneous removal of ethyl acetate, benzene and toluene with relatively low or high initial concentration is studied using a laboratory scale gliding arc gas discharge （GA） reactor. Good decomposition efficiencies are obtained which proves that the GA is effective for the treatment of volatile organic compounds （VOCs） with either low or high concentration. A theoretical decomposition mechanism is proposed based on detection of the species in the plasma region and analysis of the decomposition by-products. This preliminary investigation reveals that the GA has potential to be applied to the treatment of exhaust air during color printing and coating works, by either direct removal or combination with activated carbon adsorption/desorption process.     

从城市房屋拆迁引发的对“公共利益”内涵的思考——以重庆“最牛钉子户”事件为例

符合“公共利益”的需要是政府在城市房屋拆迁中的前提条件,但公共利益概念的不明确成为政府和民众纠纷的一个根源,所以对公共利益内涵的界定成为了政府在城市房屋拆迁中的核心问题。     

光合细菌沼泽红假单胞菌同化磷能力的研究

研究了光合细菌沼泽红假单胞菌WZ1同化磷的能力以及光照、碳源、pH值对其影响。实验结果表明：光照微好氧条件下该菌对磷的同化能力比黑暗微好氧条件下强；NaAc和苹果酸为碳源时，其同化磷的能力较乙醇为碳源时强；pH值为6．0，6．9和8．0下该菌同化磷的能力相似。在光照微好氧、NaAc或苹果酸为碳源、pH为6．9的条件下，该菌可同化0．020mg/mL左右的磷。     

静电除尘器中的活性炭喷射脱汞数值研究

依托Ansys Fluent平台及其二次开发程序建立静电除尘器(ESP)内除尘及活性炭汞吸附的数值模型,多场模型耦合了流场、电场、颗粒吸附、颗粒荷电及颗粒运动等子模型,通过该模型对静电除尘器内喷射活性炭汞吸附及颗粒收集的机理和影响因素进行探讨.结果 表明活性炭颗粒粒径和ESP内的离子风效应对于除汞除尘效率均有重要影响....     

在工程中正弦量与余弦量的快速作图和相互转换

在理工科电路理论教学中 ,数学知识的应用是教学中的难点。《电路分析》课程中所涉及到正弦量的表示法 ,就是一个数学问题。文章就正弦量和余弦量的快速作图法进行了探讨及归纳。