狭缝式透气砖在110t钢包上的应用

狭缝式透气砖在１１０ｔ钢包上的应用李学佳（鞍钢第二炼钢厂）１前言随着炼钢工业的进步，对钢的质量有着更高的要求，从而推动了炉后精炼工艺的发展。其中钢包吹氩工艺具有均匀钢水温度、去除钢水中夹杂物和有害气体等作用。目前，钢包吹氩工艺普遍采用顶吹和底吹两种方...     

宝钢高炉风口组合砖研制

通过材质、制砖工艺和使用性能的研究，从而研制出符合宝钢使用要求的优质自结合碳化硅风口组合砖。     

吹氩透气砖安装工艺的研究与实践

本文介绍了２７０ｔ钢包吹氩透气砖安全套砖的安装工艺及使用效果，该工艺已于１９９２上推广应用。     

100t转炉活炉底修砌工艺研究

通过对100t转炉活炉底修砌工艺的研究，解决了炉底最后两环只能散料打结、无法修砌的难题，杜绝了炉底打结部位发生漏炉的工艺事故。     

提高精炼钢包内衬寿命的技术措施

介绍了提高精炼钢包寿命的技术措施,对比了采用MgO-MA-C砖综合砌筑的试验方案A和采用优质MgO-C砖综合砌筑的试验方案B在精炼钢包中的使用效果,分析了不同工艺因素对钢包寿命的影响.结果表明:方案A和方案B均能大幅度提高钢包内衬寿命,但方案A具有更好的使用效果,其综合寿命比方案B高7.2%,渣线平均侵蚀速度比方案B低15.8%.钢包残砖显微结构分析表明,致密MA层的形成是MgO-MA-C砖获得良好使用效果的主要原因,这为进一步提高精炼钢包寿命提供了新的研究方向.同时,钢包周转时间、钢液温度、钢包渣成分等工艺因素对钢包寿命也有显著影响,因此稳定钢包操作,加强生产管理对提高钢包寿命具有重要意义.     

转炉45t钢包底吹Ar工艺的实践

本文介绍了以钢包底吹Ａｒ工艺取代钢包顶吹Ａｒ工艺，叙述了钢包底吹Ａｒ透气砖的选型、安装及底吹Ａｒ效果。     

刚玉透气砖特性指标与主要工艺参数的相关性

本文以试验为基础研究了不同结合剂制造的刚玉透气砖性能,重点对结合剂、颗粒配比、烧成温度等主要工艺参数与制品特性指标的关系进行了探讨。在对试验结果进行方差分析后,优选出最佳工艺条件,并进行了验证试验和制砖试用。     

生产水硬性灰渣砖系列制品的探讨

主要阐明以固体废弃物为主原料，以改性钢渣水泥为固结剂，通过真空硬塑挤出成型，免烧免蒸工艺，生产水硬性灰渣砖，块，是实现综合利用的很好途径，３个建厂方案比较，各有特点，可按具体情况选择，投资效益以方案三最佳。     

加热炉用铬刚玉平台砖的研制与应用

铬刚玉砖一般采用浇注成型或采用熔铸成型的工艺生产,但是这两种生产工艺分别存在着成本较高,生产效率较低、颗粒分布不够均匀等不足.本文介绍了一种新型的生产铬刚玉砖的生产工艺,采用该工艺生产铬刚玉砖效率较高,砖体的中温、高温强度高,抗氧化铁侵蚀性能和耐磨性能优良.     

选冶法处理含金银废砖

本文论述了含金银废砖的选矿、冶金工艺过程，并对重选精矿和浮选精矿的冶金处理过程进行了较详细的叙述，指出了工艺特点。     

钢铁企业柔性生产运营的组织与实施

柔性生产是针对大规模生产的弊端而提出的新型生产模式。叙述了柔性生产的原理和应用特点,介绍了某钢铁企业在生产组织结构、生产工序、员工培训、生产计划、生产过程等方面采用柔性生产的措施,以及在市场、生产、库存、质量等方面取得的成效。     

煤矸石化学氧化产酸产碱动力学定量描述

采用静态模拟试验方法,从含硫量不同的煤矸石的理化性质分析了煤矸石自身氧化产酸产碱规律。煤矸石氧化产酸是一个产酸产碱并存的过程,产酸过程主要是由硫化矿物的化学氧化控制,产碱过程则是碱性矿物溶解造成的酸度中和以及发生在某些硅酸盐矿物表面的因离子溶出而发生的质子交换。煤矸石的产酸阶段可以分为快速产酸期和稳定产酸期,产碱阶段可以分为快速产碱期和慢速产碱期。试样1煤矸石体系0~48 h为快速产酸期,产酸速率1.889 mmol/(kg?h),此后进入稳定产酸期,稳定产酸速率为0.012 mmol/(kg?h);0~24 h为快速产碱期,产碱速率1.594 mmol/(kg?h),之后产碱速率降为0.013 mmol/(kg?h)。试样2煤矸石体系的产酸产碱过程以48小时为转换点,快速产酸速率为0.243 mmol/(kg?h),稳定产酸速率为0.008 mmol/(kg?h);快速产碱速率为1.008 mmol/(kg?h),慢速产碱速率为0.033 mmol/(kg?h)。     

Relationship of structure and biological activity of monosaccharide lipid A analogues to induction of nitric oxide production by murine macrophage RAW264.7 cells

Lipid A is the active center of bacterial lipopolysaccharide (LPS), which exhibits diverse biological activities via the production of various mediators. We investigated the production of nitric oxide (NO), one of the mediators, by a murine macrophage cell line, RAW264. 7, upon stimulation with a series of monosaccharide lipid A analogues to elucidate the relationship of structure and activity in NO production. The production of other representative mediators, such as tumor necrosis factor alpha (TNF-alpha) and interleukin-6 (IL-6), was also investigated to compare the structural requirements for the production of these cytokines with those for the production of NO. Structure-activity relationships in NO production correlated well with those in the production of TNF-alpha and IL-6. Among the lipid A analogues possessing different numbers of acyl groups on a 4-O-phosphono-D-glucosamine backbone, compounds like GLA-60 that possess three tetradecanoyl (C14) groups exhibited stronger activities in the production of the mediators than compounds possessing four or two C14 groups. Time course study of the production of these mediators showed that production of NO started and peaked later than those of TNF-alpha and IL-6. Neither neutralization of TNF-alpha activity by antibody nor suppression of TNF-alpha production by pentoxifylline showed a significant suppressive effect on production of NO and IL-6 upon stimulation with LPS or lipid A analogues. Neutralization of IL-6 activity by antibody showed no significant suppressive effect on production of NO and TNF-alpha. A monosaccharide lipid A analogue (GLA-58) which exhibited no detectable agonistic activity showed a suppressive effect on the production of all three mediators upon stimulation with LPS or lipid A analogues. These results indicate that signals for NO production by LPS agonists in murine macrophages are transduced in good correlation with those for production of TNF-alpha and IL-6, although they are not transduced via production of those cytokines.     

高纯稀土氧化物的生产实践

介绍了一座高纯稀土氧化物生产厂建成投产后的生产实践主要状况。其包括稀土产品的生产能力及产量;选用的原料及生产工艺技术;生产中的三废状况及其治理;生产后的主要技术经济指标;产品的销售方向及发展前景;对一些问题的讨论。     

基于ERP的济钢粗能力生产计划优化系统设计及实现

根据济钢生产组织的特点，利用线性规划模型，建立济钢连铸一轧钢整条生产线的粗能力生产计划优化模型，使企业把市场、销售、生产和成本有机地统一起来。采用改进的单纯形法，成功地开发出了济钢连铸一轧钢系统的生产计划优化系统。     

菜芜钢铁集团生产计划管理研究

在深入分析莱芜钢铁集团生产特点的基础上,提出了基于规则的分型生产调度,同时分析了与其他生产管理子系统的计成关系.可改变仅靠人工临时协调造成的生产忙乱现象,提高分厂之间协同生产的能力,降低在制品库存,在降低企业生产成本的同时,提高生产效率和管理水平,实现企业生产计划调度的整体统优化.     

自动化监控系统在钨矿选厂生产过程中的应用

自动化监控系统在钨矿选厂生产过程中的应用,主要是通过对生产流程和设备的监控技术的提升,达到丰富选矿的管理手段,降低生产成本,改善生产指标,提高生产效率目的.为此,根据大江选厂生产的实际需要,设计了一套基于PLC的自动监控系统,并在该选厂实施应用.     

Evidence for a unique elastic sheath surrounding the vesicular arteries of the rabbit urinary bladder--studies of the microvasculature with microscopy and vascular corrosion casting

AD is associated with a bias of the T helper cells to show increased IL-4 and reduced interferon-gamma (IFN-gamma) production. The production of IFN-gamma and IL-4 and the development of Th cells into either high IFN-gamma or high IL-4 producers is strongly influenced by factors produced by antigen-presenting cells (APC), like IL-12 and prostaglandin E2 (PGE2). IL-12 selectively enhances IFN-gamma production and favours the development of IFN-gamma-producing Th cells, whereas PGE2 selectively inhibits IFN-gamma production by Th cells. The aim of this study was to test whether the increased IL-4/IFN-gamma production ratio by Th cells in AD can be explained by an increased PGE2/IL-12 production ratio by the APC. Monocytes were used as APC source. PGE2 and IL-12 production by lipopolysaccharide (LPS)-stimulated monocytes from 12 AD patients and 12 non-atopic controls was determined using two complementary experimental systems, whole blood cultures and purified monocytes. In addition, we determined IL-6 production as a measure of monocyte activation, and IL-10 production because IL-12 production by monocytes is highly influenced by endogenously produced IL-10. The monocytes from AD patients showed normal production levels of IL-6 and IL-10, a two-fold, but non-significant decrease in IL-12 production, and a significantly (three-fold) higher PGE2 production than those from non-atopic controls. Here we show for the first time that enhanced PGE2 production by monocytes in AD is not accompanied by a general rise in cytokine production. We conclude that AD is indeed associated with an increased PGE2/IL-12 production ratio by monocytes.     

SAP系统在生产计划管理中的应用

介绍了安钢SAP系统中生产计划管理的主数据管理、生产计划管理、生产订单执行、生产管理与成本管理的集成实现等,该系统完成了生产计划与管理控制一体化,实现了生产模式的跨越发展。     

基于启发算法的现代企业生产调度研究

针对现代企业生产制造信息化中常见的多品种、小批量、高质量的生产特征,从不同产品在生产过程中所经历的组装时间角度出发,研究如何进行生产调度以缩短总生产时间和周期,基于生产特点,提出了一种能有效缩短产品生产调整时间的生产调度启发式算法。经仿真数据显示,该算法能够给出较满意的生产调度方案,从而为企业提高了生产效率。