高效、节能、低污染的新型连续电弧炉

世界上第1台高效节能型连续电弧炉（环形竖炉）已在希腊投入运行，由于连续加料及炉料被炉子排出的废热气连续加热，所以其运行成本只有普通电弧炉的42%，另外的优点是：排出的烟尘非常少、低噪音、低电压闪变以及低的电能消耗。     

Mathematical Modeling of Drying of Liquid/Solid Slurries in Steady State One-Dimensional Flow

ABSTRACT

A mathematical model of simultaneous mass, heat and momentum transfer for two-phase flow of a gas and a solid/liquid slurry was developed. The model was applied to calculation of the drying process of coal-water slurry droplets in a gas medium in a steady one-dimensional flow. The model was based on the well-known two-stage drying process for slurry droplets. After the first period of drying, in which the evaporation rate is controlled by the gas phase resistance, the evaporating liquid diffuses through the porous shell (crust) and then, by convection, into the gas medium. Inside the dry external crust of the drop, a wet central core forms, which shrinks as evaporation proceeds. The temperature of the slurry droplet rises. The process ends when the temperature of the dry outer crust reaches the coal ignition temperature in the case of combustion or when the moisture of the particle reaches the final required moisture. The developed model was based on one-dimensional balance equations of mass, energy and momentum for the liquid/solid and gas phases. The system of governing equations was represented by first-order differential equations and solved simultaneously. The numerical solution of the governing equations was obtained using Gear's method. The model permitted calculation     

周向导波在不同连续性条件多层圆筒中的传播

通过对多层厚壁圆筒中周向导波频散曲线研究,发现周向导波在多层圆筒中传播时,会发生明显的频散现象和模态干涉现象,第1阶模态在高频时接近于无频散的Rayleigh面波。通过对不同连续性条件的多层筒与单层筒的频散曲线比较,以及筒的层数对频散曲线的影响,都充分说明了检测层间界面缺陷的周向导波应该集中在低阶模态上。最后对不同连续性条件多层筒的位移研究,最终推断出第2阶模态具有在层间界面附近集中能量的特征,可应用于层间界面缺陷的周向导波无损检测技术中。     

Sustained attention in children with two etiologies of early hydrocephalus.

Several studies have shown that children with spina bifida meningomyelocele (SBM) and hydrocephalus have attention problems on parent ratings and difficulties in stimulus orienting associated with a posterior brain attention system. Less is known about response control and inhibition associated with an anterior brain attention system. Using the Gordon Vigilance Task (Gordon, 1983), we studied error rate, reaction time, and performance over time for sustained attention, a key anterior attention function, in 101 children with SBM, 17 with aqueductal stenosis (AS; another condition involving congenital hydrocephalus), and 40 typically developing controls (NC). In SBM, we investigated the relation between cognitive attention and parent ratings of inattention and hyperactivity and explored the impact of medical variables. Children with SBM did not differ from AS or NC groups on measures of sustained attention, but they committed more errors and responded more slowly. Approximately one-third of the SBM group had attention symptoms, although parent attention ratings were not associated with task performance. Hydrocephalus does not account for the attention profile of children with SBM, which also reflects the distinctive brain dysmorphologies associated with this condition. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

锡铅合金的热型连铸

热型连铸Ｓｎ４０％Ｐｂ时，用连续测温方法测定铸型出口处不同温度下的型内温度分布。由此求得固＋液区的长度、位置和温度梯度等数据。发现随着铸型温度的提高，固＋液区变短并向型出口移动；温度低于２１６℃时，由于固＋液区长而形成热裂，高于此温度热裂消除并获得光洁表面；温度梯度大于０．３９℃／ｍｍ时实现等轴晶向柱状晶的转变。     

结晶器振动双机互备份控制系统

介绍连铸生产中结晶器振动控制系统的组成原理，提出双机互备份并行工作方案，以确保连铸核心装置部分的连续性与稳定性。实际运行表明，该系统工作稳定，有效地提高了连铸生产的可靠性。     

Infra-red temperature measurement of bright metal strip using multiple reflection in a roll-strip wedge to enhance emissivity

In a continuous annealing furnace, strip temperature was measured using radiation thermometers aimed, at a shallow angle to the strip, into the wedge-shaped cavity formed between the strip and a roll. The dependence of the observed temperature on thermometer operating wavelength, field-of-view, aiming and polarisation was investigated. Comparison was made against reference temperatures taken with a surface pyrometer and also derived from strip metallurgy. Control of the furnace, using a wedge thermometer, was demonstrated. The technique is potentially applicable in a wide variety of bright metal processing furnaces.     

热连轧工艺中定宽压力机的性能特点

结合鞍钢新建１７８０ｍｍ热连轧带钢机组，介绍了当代热连轧带钢机组的最新设备之一－定宽压力机组的组成、作用儿技术特征。通过具体实例，论证了定宽压力机的设置，不仅提高了钢材的收得率，而且大大减少了板坯连铸机的浇铸宽度规格，从而提高了板坯连铸机的生产能力。