共查询到20条相似文献,搜索用时 171 毫秒
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连铸板坯液相分数及凝固末端的准确检测对于减少铸坯偏析、缩松等内部缺陷,提高铸坯质量和生产效率具有重要意义。提出了一种连铸板坯液芯在线检测新方法,通过控制扇形段内弧低幅低频振动,同时提取相应振动频率下结晶器液面波动幅值检测铸坯液芯厚度及凝固末端。根据压下效率与液芯厚度的耦合关系,以及扇形段内弧周期性振动条件下铸坯固液共存区的流变行为,对铸坯液芯厚度与结晶器液位波动的数学关系式进行了理论推导。以某钢厂为例,对不同振幅与不同拉速下的铸坯液芯厚度和凝固末端进行了试验,并与理论值进行了对比,验证了该方法的可行性。研究结果可为连铸板坯凝固过程中液芯厚度及凝固末端的在线检测提供指导和参考。 相似文献
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结晶器冷却强度与坯壳厚度的关系 总被引:3,自引:1,他引:3
根据斯蒂芬凝固定律直接导出了坯壳厚度与结晶器冷却强度及拉坯速度的关系。因此可根据坯壳厚度合理地确定冷却强度及拉坯速度或由冷却强度预测坯壳厚度。计算结果与传统的凝固平方根定律相吻合,从而可确定平方根定律的凝固系数。 相似文献
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介绍了热轧氧化铁皮控制技术发展情况。结合实验室热轧氧化铁皮厚度与结构演变的研究结果,对热轧钢材氧化铁皮控制技术的最新进展和应用进行了阐述。提出了针对热轧高强钢后续加工特点的氧化铁皮的柔性化控制技术。初步明确了热轧钢板表面氧化铁皮结构对钢板耐候性能的影响规律。 相似文献
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Presents an obituary for Mary Starke Harper, a leading authority on mental health care for minorities and the aged. Harper earned a bachelor's degree in education and a master's degree in nursing education with a psychiatric nursing clinical specialty. She moved unpretentiously among the politically influential, showing tireless drive and tenacity on behalf of her causes. She served as an advisor on mental health and aging for Presidents Carter, Reagan, G. H. W. Bush, and Clinton; directed the Office of Policy Development and Research for the 1981 White House Conference on Aging; served as a consultant for the 1995 White House Conference on Aging; and cochaired the Clinton administration's Mental Health/Public Sector Task Force for Healthcare Reform. After formal retirement in 1995, she remained an active, outspoken advocate for improved mental health care for minorities and the aged. She served as an expert adviser on women's health for the U.S. Department of Health and Human Services, a member of the National Institute of Aging's National Advisory Council, a state of Alabama trustee on mental health, and a consultant or member of the board of directors for a wide array of other organizations, foundations, and universities. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
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介绍了济钢供排水现状,根据存在的节水意识淡薄,管理体系不完善以及部分计量仪表和设施失修等问题,认为必须强化节水意识,完善节水管理,并对重点外排水进行控制等措施,才能减少吨钢耗新水量,提高水资源利用率。 相似文献
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超声波雾化喷嘴的设计 总被引:1,自引:0,他引:1
在超声波雾化设计原理的基础上,将雾化喷嘴按照用途进行了分类,总结了三类超声渡雾化喷嘴。在研究雾化汽油等燃料类的喷嘴、雾化水类的喷嘴的基础上。着重叙述了制取微细金属粉末的超声波雾化喷嘴;在固体雾化技术研究的基础上。研制成一种新型的雾化喷嘴——双层固体技术雾化喷嘴,叙述了它的工作原理和雾化机理,并进行了简单的实验验证。 相似文献
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Two experiments examined the effects of encoding operations on forced-choice recognition memory for upright and inverted photographs of faces. In Experiment 1, with distractors closely matched to targets, performance was better on upright than on inverted faces, but was unaffected by whether subjects judged faces for distinctive features, distinctive traits or distinctive expressions. In Experiment 2, where distractors were either absent or weakly matched to distractors, accuracy was again higher on upright than on inverted faces, and was similar for the three encoding operations on upright faces. In contrast, it was poorer for distinctive expression judgments than for distinctive feature or for distinctive trait judgments on inverted faces. These results support Winograd's (1981) claim that distinctive feature and distinctive trait judgments both lead to the isolation of distinctive features. However, it was argued that distinctive expression judgments led to configural processing that was disrupted by inversion. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
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通过分析、研究山西分公司运输部SRTMIS系统(氧化铝企业专用铁路运输管理信息系统)存在的问题,提出运用分而治之的架构思想对系统进行改造的建议,为系统的进一步升级完善做好准备。 相似文献
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通过对人耳受到部分遮挡时识别的研究,提出了一种基于局部特征的部分遮挡人耳识别方法,即首先利用Gabor小波对人耳图像进行特征提取,由于该特征维数较高,再使用核Fisher判别分析(KFDA)方法进行有效降维后用于人耳识别.在逐步分析人耳各个子区域的鉴别能力的基础上,提出了基于分块图像和概率模型的识别方法.在北京科技大学(USTB)人耳图像库上的实验结果表明:基于Gabor滤波后图像所提取的特征比基于原始图像直接提取的特征具有更高的识别率,基于分块图像的识别率高于基于整体图像的识别率. 相似文献
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热连轧窄带钢动态自动宽度控制 总被引:1,自引:0,他引:1
以450mm热连轧机为仿真对象,根据窄带钢宽向变形特点、工艺参数变化及现有机械、电气设备条件和有关检测装置,进行热连轧窄带钢动态宽度控制仿真研究,分析各种因素对宽度控制效果的影响及存在问题,寻求最佳控制方案,为在线实时宽度控制提供理论依据。 相似文献
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Building on the development of a tool for in place soil investigation based on the use of endoscopy, this paper presents a method for soil characterization using the images recorded by this tool. Various techniques have been explored including texture analysis which is very attractive because it is based on global image analysis. The use of a third order moment resulting from spectral analysis and its value for soil characterization is presented. The influence of various parameters (particle size distribution, mineralogy, water content, and compaction) on the moment evolution is studied. 相似文献
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文章结合本公司自主开发的端进端出式铜扁锭加热炉的设计过程,指出炉子方案制定和设计时需要注意的事项,重点介绍了端进端出式步进炉在新技术、新装备方面的开发应用,并提出该炉型在以后设计过程中需要技术改进的方面。 相似文献