马钢4000m3高炉中修停开炉及快速达产实践

对马钢A号4000m~3高炉中修空料线停炉、开炉操作实践进行了分析总结。停炉采用回收煤气、炉顶打水降温空料线法,停炉过程中未发生一次爆震,料面整体降至风口中心线,实现了安全顺利停炉。中修开炉恢复进程顺利,风量、负荷恢复节奏良好,未出现崩料、管道、悬料等炉况失常问题,开炉第四天高炉利用系数达到2.029,实现快速开炉达产。     

梅钢二号高炉停炉中修生产实践

梅钢二号高炉中修停炉更换五、六段冷却壁时采用了降料线打水回收煤气的方法.通过控制炉顶温度、煤气中H2和O2含量、炉内通氮气等措施做到了安全停炉,全程无爆震.计算了停炉料和停炉过程中料线的位置,保证了整个停炉过程按计划进行,使得料线顺利降到风口以下,为后续的恢复性改造施工创造了有利条件.     

酒钢7号高炉回收煤气停炉实践

对酒钢7号高炉(2650m~3)回收煤气停炉实践进行了总结。7号高炉因安全问题需停炉维修,首次采用降料面打水回收煤气的停炉方法,在炉身通入氮气控制煤气中H_2、O_2含量,同时在炉顶、重力除尘器出口及减压阀组后安装喷雾打水装置实行分段式降温。降料面过程中,7号高炉炉顶温度控制在350～450℃,煤气成分和温度达到回收标准,回收煤气达到60%,没有出现爆震,实现了安全、环保停炉。     

天钢3200 m3高炉空料线停炉操作实践

天钢3200m3高炉自投入生产以来,原燃料长期不稳定,造成渣皮频繁脱落,导致冷却壁温度波动异常,严重影响了高炉的稳定顺行,难以保证安全生产.对天钢3 200 m3高炉进行停炉中修,采用“回收部分煤气空料线打水降料面”的方法停炉,将料面降至风口中心线.对停炉全过程进行了介绍,主要包括停炉前的准备工作及其炉况调整,采用全风量、炉顶打水,控制炉顶温度保持在350 ～ 500℃,实现了快速、安全停炉.     

邯钢3200m~3高炉中修停炉及开炉操作

邯钢3200m~3高炉中修停炉时,采用前期快速降料面、憋压出铁、充氮气保护、根据料面深度控制风量与打水量等措施,实现了高炉安全、环保、快速停炉。停炉后,采用不入炉直接更换铜冷却壁技术,使炉内降温、冷却壁更换与炉顶设备更换同时进行,既节约了中修时间,又避免了快速降温大量打水破坏炉缸炭砖。高炉中修开炉非常成功,开炉第3天利用系数达到2.45,燃料比降到495 kg/t。     

鞍钢2580m~3高炉大修停炉实践

鞍钢股份有限公司炼铁总厂新4号高炉大修停炉采用空料线打水回收煤气的方法,整个停炉过程历时16 h。由于准备充分,风量、炉顶打水量、煤气成分等各项参数控制合理,延长了回收煤气时间,实现了安全、快速、顺利停炉,顺利将料面降到风口以下。     

淮钢特钢4~#高炉停炉实践

对淮钢4#高炉停炉操作进行总结,这次停炉采用半回收煤气空料线打水停炉,实现安全顺利停炉,料面降到预期目标。     

首钢长钢8号高炉安全停炉实践

为确保炉顶设备和煤气系统的安全,实现安全、环保、节能地快速停炉,对首钢长治钢铁有限公司炼铁厂8号高炉开展停炉实践。停炉过程采用空料线打水法,并对高炉降料面时的炉顶雾化打水、炉顶温度、煤气回收等各项操作参数进行严格控制。     

本钢6号高炉空料线停炉操作实践

本钢6号高炉(2850m3)于2008年11月2日采用回收煤气、炉顶打水降温空料线将料面降到风口中心线以下,并成功利用软探尺、炉顶和除尘器煤气曲线CO2相结合准确判断料线深度和料面位置,整个过程实现了安全、顺利、快速停炉。     

太钢5号高炉煤气全回收停炉操作

对太钢5号高炉首次采用"炉顶空料线打水、煤气全回收、不放残铁"方式停炉进行了总结.经过停炉前充分准备、制定详尽的停炉方案,以及停炉过程中的精细化操作,停炉过程共用时15h16min,料线最深23.5m,停炉累计用风402.20万m3,共打水1583 to 5号高炉按计划节点完成停炉和凉炉,全程无爆震、无崩料、炉壳无开裂...     

Health status of women in the U.S. military.

Examined health-related issues concerning women in the military (i.e., pregnancy-related conditions, physical injuries and capabilities, stress-related disorders). It is noted that the most frequent reason for being hospitalized among Navy women who enlisted from 1974–1979 was for a pregnancy-related condition. Comparisons of injury-related hospitalizations indicated that these women had the highest hospitalization rates across occupational groups and pay grades. Women assigned to nontraditional jobs had somewhat higher admission rates for injuries than women in traditional jobs. Rates for injury- and stress-related conditions tended to decrease with increasing pay grade levels. Programs designed to improve women's physical conditioning, enhance job-related capabilities, and expand their opportunities are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Investigation of annealing twins in F.C.C. metals

The analysis of lamellar twin nucleation and growth in materials with f.c.c structure is given. The orientation of the annealing twin components in copper and Fe-50% Ni alloy was determined by Laue back reflection method. Twin component misorientation can be different from Σ = 3. Besides Σ = 3, misorientations with Σ = 11, 9, 5, 17 and 13 were observed. Results are discussed in terms of atomic mechanism of twin formation due to grain boundary dissociation. A more correct definition of twin is given.     

A quantitative assessment of forest-hardening in f.c.c. metals

Macroplastic deformation results from the long-distance movement of dislocations. In singlephase crystals it implies cutting the dislocation forest traversing the slip plane of the running dislocations and, as a consequence of the non-regular distribution of the “trees”, dislocation loops are left around the harder islands in their slip planes. The dislocation length so stored represents an increment of the obstacle density already present in other non-coplanar slip systems and thus contributes to their work-hardening. This work presents quantitative results on the contribution by forest cutting in a f.c.c. metal upon flow stress and work hardening rate. It has been obtained by computer simulation of dislocation glide through a mixture of punctual and linear obstacles whose strengths reproduce approximately the strength spectrum of a f.c.c. forest as derived by Shoeck and Frydman. Simulations have been conducted for random arrays of obstacles and for more realistic spatial dislocation distributions (cells, subgrains). Both the flow stress (and its temperature and strain rate dependence) and the athermal work-hardening rate so obtained are in good agreement with those measured for f.c.c. polycrystals in experiments covering up to large strains.     

Rate of forgetting in H.M.: 6-month recognition.

Picture-recognition performance of H.M. and 6 controls was evaluated 6 mo after initial learning, using materials from an earlier study in which the S received additional study time in order to equate his yes–no and delayed-match-to-sample (DMS) performance 10 min after learning to that of control Ss. In the present study, 6-mo recognition performance was assessed with no intervening exposure to target items. The S performed at chance levels when tested using the standard yes–no recognition procedure. When the yes–no procedure was modified so that distractor stimuli required positive responses, performance was comparable with that of controls. In addition, the S's DMS and delayed-nonmatch-to-sample performance were comparable with that of controls 6 mo after learning. Conclusions regarding the S's 6-mo recognition performance are thus dependent on the procedures used to assess memory. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The work of psychologists in the U.S. Intelligence community.

This reviews articles in a special issue (Civiello, 2009) of the Consulting Psychology Journal: Practice and Research on applications of psychology in the U.S. intelligence and military contexts. It identifies some common themes of the articles, as well as provides individual critiques of them. In general, the reviewer notes that the articles focus more on the current and desired state conditions than on the strategies, process, and mechanisms that might have been employed to obtain those desired states. This suggests that embedded psychologists might adopt a socio-technical-structural systems perspective and attempt to expand their specialized roles to include consulting on organizational change. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Overview no. 96 evolution of f.c.c. deformation structures in polyslip

The microstructural evolution during polyslip in f.c.c. metals in investigated by the examples of Al, Ni, NiCo alloys and an AlMg alloy, deformed at room temperature either by rolling or by torsion. The principles governing this evolution appears to be the following: (a) There are differences in the number and selection of simultaneously acting slip systems among neighboring volume elements of individual grains. In any one volume element (called a cell block), the number of slip systems falls short of that required for homogeneous (Taylor) deformation, but groups of neighboring cell blocks fulfil the Taylor criterion collectively. (b) The dislocations are trapped into low-energy dislocation structures in which neigboring dislocations mutually screen their stresses. The microstructural evolution at small strains progresses by the subdivision of grains into cell blocks delineated by dislocation boundaries. These boundaries accomodate the lattice misorientations, which result from glide on different slip system combinations in neighbouring cell blocks. The cell blocks are subdivided into ordinary cells and both cell blocks and cells shrink with increasing strain. All observations appear to be in good accord with the theoretical interpretation. However, some problems remain to be solved quantitatively.