240万t/a球团厂铁精矿干燥系统的设计

对240万t/a球团生产线的铁精矿干燥系统进行了分析及计算,结果认为,采用4×20 m圆筒干燥机比3.6×24 m圆筒干燥机更适合。由热平衡计算得出,干燥系统配备的风机风量为13.5万m3/h,为节省电耗,风机应采用变频调速。对干燥废气安装补热装置有助于控制废气温度高于露点温度,从而确保布袋除尘器的安全运行。     

以结构优化调整促进能源利用效率的提高

济钢在发展循环经济的过程中,随生产结构的变化,各类能源介质均出现了不同程度的不平衡现象,供需矛盾及能源浪费现象制约了生产的稳定顺行和效益提高。通过煤气平衡模型建立、蒸汽外销、水源置换等能源介质的结构优化,在满足生产需求的前提下提升了发电水平,挖掘了余热潜力,降低了限产损失和成本,年综合经济效益在1亿元以上,能源利用效率大幅提高。     

粘土烧结砖吸湿膨胀的动力学特性

研究了粘土烧结砖吸湿膨胀的动力学特性,揭示出作为粘土烧结砖吸湿膨胀过程中激活能源的过热饱和水蒸气的能量与绝对温度之间的关系,测试了两类粘土烧结砖吸湿膨胀过程所需激活能的大小,推导出其激活能并不是一个常量,但其平均值约为：70kJ/mol～75kJ/mol。     

Influence of Water on Properties of Cellulosic Fibre Reinforced Polypropylene Composites

Abstract

Flax fibers with different moisture content were used as reinforcement in polypropylene matrix with maleic anhydride grafted polypropylene coupling agent. Mechanical properties-three point bending and Izod impact strength-were investigated as a function of moisture content of the fiber, and amount of applied coupling agent.

By decreasing the moisture content of the fiber all the investigated properties can be improved. Using PPgMA as coupling agent the three point bending characteristics (flexural strength, flexural modulus, and ultimate bending stress) were better, while the impact strength decreased.     

Mass balance soil ingestion estimating methods and their application to inhabitants of rural and wilderness areas: A critical review

Quantitative soil ingestion studies employing a mass balance tracer approach have been used to provide a defensible means to estimate soil ingestion for human health risk assessments. Past studies have focused on soil ingestion in populations living in urban/suburban environments. There is a paucity of reliable quantitative soil ingestion data to support human health risk assessments of other lifestyles that may be predisposed to ingesting soil, such as agricultural workers or indigenous populations following traditional lifestyles. The results of a preliminary analysis of sampling and analytical variability that would result from assessing activities typical of populations in rural or wilderness areas and conducted over wide areas show that approximately 225 subject days would be required to detect a difference of 20 mg/d in soil ingestion. Given the typically small populations in these areas, future soil ingestion studies should be focused on specific activities with a high potential for soil ingestion.     

热量平衡方程修正下的Penman公式

对于Penman公式仅仅作各因子在考虑到地理环境改变后的相应修正并不能消去呈季节性变化的计算误差。本文从热量平衡方程的角度出发,对Penman公式作了重新讨论和修正,并给出了考虑水体热通量和雨水耗热以后的修正Penman公式。     

智能水份测量仪

本文介绍依据电容传感器用于物质的水份测量的数学模型,采用单片微机的智能式水份测量仪,着重讨论其硬件组成及程序设计的特点.该仪器具有精确、稳定和适用面宽等优点,业已通过鉴定并批量生产.     

频率域辨识非线性反馈系统内部结构的方法

本文讨论频率域辨识系统内部结构的方法.采用单一频率而振幅变化的正弦信号于系统,通过测量系统的稳态响应,使我们可以得到一类非线性反馈系统内部结构的判据.     

铀氢锆堆物理计算模型与程序

文中叙述基于两维四群中子扩散理论的铀氢锆堆物理计算模型及程序,以及用该模型计算的国外 TRIGA 堆的临界,控制棒效率等数据.     

HYDROPHOBICITY－HYDROPHILICITY BALANCE RELATIONSHIPSFORCOLLECTORLESSFLOTATIONOFSULPHIDEMINERALS

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