室内皮带上煤机除尘系统改造设计

针对某公司热电厂皮带上煤机除尘系统所存在的问题,进行了全面的改造设计,取得了良好的除尘效果。     

海化集团自备热电厂1#炉除尘系统改造

针对海化集团自备热电厂130 t/h煤粉炉原有除尘系统存在的问题进行了全面的分析,在此基础上,结合厂方提出的要求,确定了改造方案,并进行了改造设计.改造后实际运行情况表明:1#炉除尘系统运行良好,除尘效率超出厂方提出的要求,达到98.5%以上.     

安钢90 m2烧结机尾除尘工艺设计特点

介绍了安钢90 m2烧结机尾除尘工艺设计中的设备选型、系统配置、管网阻力平衡的特点及应注意的几个问题.     

Engineering line diagram development from process flowsheets: Part 1: Shortfalls in current practice

Engineering line diagram (ELD) development forms a distinct phase in process plant design. It is a complex and expensive activity and as such warrants considerable effort to minimise costs and maximise effectiveness. In this paper, the nature of the ELD design task is analysed in order to understand how it could be carried out more effectively. A number of shortfalls in current practice are discussed. These shortfalls were identified through a combination of the following activities: a review of the literature; a survey of current practice and follow-up line diagram development exercise; and task analysis work carried out at ICI. The most significant findings of the survey of current practice are presented. It is proposed that the shortfalls identified can be overcome by introducing structure to the design task. The manner in which this can be achieved is the subject of the second part of this paper.     

工程项目设计中的环保管理

为了使基本建设工程项目和技术改造工程达到环境保护的要求,针对有一定难度的工程设计,按初步设计、技术设计和施工图设计三个阶段进行。最终使整个工程部署紧凑,流程顺畅,技术先进可靠,生产方便,经济合理。     

现行资源税设置中存在的问题及对策

对资源征税的意义不仅在于增加财政收入,更重要的是促进资源的有效管理,为国民经济持续、稳定的发展提供可靠保证。从这个目的出发,就资源税设置中存在的一些问题进行了深入探讨,以期使资源税的征管工作能在国民经济运行中发挥更大作用。     

工程结构的风灾破坏和抗风设计

风是自然界常见的一种自然现象 ,国内外每年都会发生因风灾而造成的严重灾害。风灾损失的主要形式之一是工程结构的损坏和倒塌。因此 ,工程抗风设计计算的合理和全面与否是工程安全的重要关键 ,抗风设计也是工程结构中的重要研究课题。笔者结合我国的有关抗风工程的工程规范 ,介绍了风对结构的作用、工程结构的风灾破坏形式和抗风设计的主要研究内容。最后 ,笔者对抗风工程的研究进行了展望。     

MEETING PUBLIC EXPECTATIONS WITH ECOLOGICAL INNOVATION IN RIPARIAN LANDSCAPES1

ABSTRACT: Appearances matter for managing riparian landscapes because the appearance of landscapes affects public willingness to accept plans and designs that improve ecological quality. Riparian landscape design and planning should respect and strategically incorporate characteristics that the public values and expects to see. Such design can be quite novel in its ecological effects, but it also should be sufficiently familiar in appearance to correspond with cultural values. This paper describes some influential cultural values for riparian landscapes and demonstrates how attention to such values supports public acceptance of ecologically innovative design in rural and urban watersheds.     

A SCALE‐INVARIANT GAUSS‐MARKOV MODEL FOR DESIGN STORM HYETOGRAPHS1

Abstract. Hyetographs are essential to many hydrological designs. Many studies have shown that hyetographs are specific to storm types and durations. Recent work presented evidence that dimensionless hyetographs are scale invariant. We show that the simple scaling property of rainfall guarantees that the normalized rainfall rates of different storm durations are identically distributed and propose a nonstationary Gauss‐Markov model based on the annual maximum events that arise from the dominant storm type. We derive the unique estimators for the parameters of the Gauss‐Markov model under two constraints that: (a) the typical peak rainfall rate is preserved, and (b) the most likely hyetograph is obtained. One attractive feature of this model is that it allows translating hyetographs between storms of different durations. Two examples illustrate our model.     

均匀设计用于研究硝基苯衍生物对青海弧菌Q67的联合毒性

实验设计在混合物毒性评估与预测中起着非常重要的作用. 应用微板毒性测试方法测定了7种硝基苯衍生物对青海弧菌Q67的发光抑制毒性,硝基苯、邻氯硝基苯、间氯硝基苯、对氯硝基苯、间硝基苯胺、对硝基苯胺和对硝基甲苯的-lg EC₅₀值(EC50的单位为mol/L)分别为2.66,3.22,3.30,3.29,2.94,4.22和3.39;引入均匀实验设计方法,在单个硝基苯衍生物剂量-效应关系基础上构建不同效应浓度下的10个混合物,同样应用微板毒性测试方法测定其对Q67的毒性,应用剂量加和(DA)与独立作用(IA)原理建立了混合物毒性的评估与预测模型. 结果表明:与等效应浓度比法相比,均匀实验设计构建的混合物浓度配比,具有三维浓度分布特征,可在更大范围内考察各种可能的混合物类型,更加接近于实际环境体系.