运用层次分析法对株洲霞湾污水处理厂污水处理工艺方案择优

应用层次分析法对霞湾污水厂污水处理工艺方案择优,取得满意的结果,证明在多因素、多层次的工艺方案评优问题中,运用层次分析法分析、解决问题是一种非常有效的方法和手段。     

城市街道峡谷中气态污染物扩散数值计算方法研究

选用不同的差分格式(Upwind, Hybrid, Hquick)对城市街道峡谷内部汽车污染物排放浓度进行了预测,并于风洞实验结果对比。研究表明,三种格式的计算结果和实验结果总体趋势一致,即背风面建筑物附近浓度远高于迎风面建筑物附近的浓度,地面附近浓度高于峡谷上方的浓度。相比之下,Hquick格式的预测性能最佳,应为首选。     

稳高压消防水系统改造方案优选

分析稳高压消防水系统改造的5种设计方案的特点，对这些改造方案的安全可靠性、运行费用进行分析，为稳压消防水系统改造设计、决策提供参考。     

金属板材成形的静力隐式有限元分析与程序设计

阐述了用于板材成形过程静力隐式数值模拟的弹塑性大变形有限元方法 ,基于给出的方法编制了板材成形过程数值模拟软件 ,并对矩形板的液压胀形进行了有限元分析 ,计算结果与典型的实验结果吻合很好。对球形模具拉伸成形过程进行了数值模拟 ,给出了计算结果     

预处理-两段好氧工艺处理PTA生产废水的开工运行

针对Amoco技术PTA生产排水中TA含量高的特点，采用预处理-两段好氧工艺处理该废水在洛阳石化总厂成功地实施了工业运行。介绍了开工过程并对有关问题进行了讨论。     

生产厂区封闭化管理系统解决方案

简述了为加强对石化生产厂区进出作业人员、车辆的安全管理,确保安全生产和作业人员的生命安全而实施的生产厂区封闭化管理的系统解决方案.     

Small sample estimation for Taylor's power law

An analysis of counts of sample size N=2 arising from a survey of the grass Bromus commutatus identified several factors which might seriously affect the estimation of parameters of Taylor's power law for such small sample sizes. The small sample estimation of Taylor's power law was studied by simulation. For each of five small sample sizes, N=2, 3, 5, 15 and 30, samples were simulated from populations for which the underlying known relationship between variance and mean was given by ² = c^d. One thousand samples generated from the negative binomial distribution were simulated for each of the six combinations of c=1,2 and 11, and d=1, 2, at each of four mean densities, =0.5, 1, 10 and 100, giving 4000 samples for each combination. Estimates of Taylor's power law parameters were obtained for each combination by regressing log₁₀ s ² on log₁₀ m, where s ² and m are the sample variance and mean, respectively. Bias in the parameter estimates, b and log₁₀ a, reduced as N increased and increased with c for both values of d and these relationships were described well by quadratic response surfaces. The factors which affect small-sample estimation are: (i) exclusion of samples for which m = s ² = 0; (ii) exclusion of samples for which s ² = 0, but m > 0; (iii) correlation between log₁₀ s ² and log₁₀ m; (iv) restriction on the maximum variance expressible in a sample; (v) restriction on the minimum variance expressible in a sample; (vi) underestimation of log₁₀ s ² for skew distributions; and (vii) the limited set of possible values of m and s ². These factors and their effect on the parameter estimates are discussed in relation to the simulated samples. The effects of maximum variance restriction and underestimation of log₁₀ s ² were found to be the most severe. We conclude that Taylor's power law should be used with caution if the majority of samples from which s ² and m are calculated have size, N, less than 15. An example is given of the estimated effect of bias when Taylor's power law is used to derive an efficient sampling scheme.     

衡水夏季典型时段VOCs污染特征及O3污染过程分析

选取臭氧（O₃）污染高发的7月为夏季典型月，采用自动观测设备，从前体物VOCs的浓度水平及O₃生成潜势（OFP），前体物、气象因素与O₃相关性等多方面研究了衡水市O₃污染影响因素，并剖析了一次典型的O₃污染过程，以期为衡水市夏季O₃污染防治提供科学参考。研究结果表明：衡水市VOCs主要组分浓度占比为烷烃 > 烯烃 > 芳香烃 > 乙炔，主要组分对总OFP的贡献为烯烃 > 芳香烃 > 烷烃 > 乙炔；O₃与前体物VOCs、NO₂存在负相关性，与温度存在正相关性；相对湿度低于48%时，O₃和相对湿度呈负相关性，相对湿度高于48%时，O₃和相对湿度呈正相关性；气团中VOCs化学组成稳定性较低，平均VOCs最大增量反应活性（MIR）较低，为4.855gO₃/gVOCs；衡水市7月2—4日重度污染过程受本地生成和区域传输叠加影响。     

合成旅后装保障方案决策运用模糊评价方法探讨

为使合成旅后装保障方案的决策过程量化,达到决策结果更加符合客观事实的目的,通过引入模糊评价方法,结合分析后装保障方案决策的选择影响因素,确定了不同指标因素下对应的隶属函数,进而建立了针对后装保障方案决策评价问题的定量分析评价模型,最后给出该评价方法的实例运用,结果分析可知该模型在一定程度上保证了后装保障方案决策的科学合理性。     

钢框架梁柱节点抗震性能拟静力试验研究

梁柱节点在钢框架结构中处于竖向荷载和水平荷载交汇关键部位,直接决定结构的受力性能和抗震能力。依托北京市档案馆新馆工程,根据工程需要和设计规范要求,对3个采用传统连接形式的钢框架梁柱节点,采取循坏加载的拟静力试验方法进行抗震性能研究,探讨了连接构造形式、冷作硬化效应和加载方案等对节点承载力、延性和破坏模式的影响。试验结果表明,传统连接形式节点具有承载力高、变形小、设计和施工简便的优点,但易发生脆性破坏;冷作硬化可以提高试件的承载力和变形能力,但不改变最终失效模式;加载方案对失效模式没有影响。