关于高炉低硅冶炼的探讨

分析了高炉内硅的来源和硅在高炉内还原的特点,总结了目前国内外高炉低硅冶炼的现状,提出了高炉低硅冶炼的措施。     

承钢2500m~3高炉钒钛矿低硅冶炼实践

从理论上分析了高炉钒钛矿冶炼中硅在铁水中的迁移行为规律和控制措施,介绍了承钢2 500 m3高炉钒钛矿低硅冶炼中硅平衡的测算和生铁含硅的主要来源。该高炉通过原燃料管理、调整操作制度、提高管理水平等措施,使其冶炼钒钛磁铁矿时生铁中的硅含量大幅度降低,高炉生产做到了长周期稳定顺行。     

高炉冶炼低硅生铁技术的探讨

高炉冶炼过程中,降硅是一项重大节能增产措施。既可降低高炉焦比和提高产量,也可促使转炉炼钢实行无渣或少渣冶炼,从而降低炼钢成本。本文分析了国内外高炉冶炼低硅生铁的技术现状、硅的还原机理,提出了高炉冶炼低硅生铁的技术措施。     

低硅高炉锰铁冶炼实践

分析了锰铁高炉内硅还原机理，冶炼低硅高炉锰铁的基本条件、途径和工艺措施，指出了高炉冶炼低硅锰铁的技术经济优势。     

基于支持向量机的铁水硅含量的预测

为了准确预测高炉炼铁过程的硅含量,分析了高炉工艺参数对高炉铁水硅含量的时序性影响,以支持向量机理论为基础构建了2类铁水硅含量预测模型,即硅含量模型和硅变化量模型。利用首钢迁钢3号高炉铁水硅含量数据进行模型测试,测试结果表明2类模型预测命中率均可达到80%。     

高炉低硅冶炼实践

唐钢1#高炉2009年大修开炉后采用低硅冶炼技术,使铁水含硅量由0.53%逐步降低到0.35%,并长期稳定在0.38%左右,炉况稳定顺行。结合唐钢1#高炉生产操作实践,分析了原燃料条件、高炉基本操作以及冶炼特点对低硅冶炼的影响,为高炉稳定铁水中硅含量在较低水平和保证高炉长期稳定顺行总结了宝贵的经验。     

六西格玛技术在铁水硅含量稳定性分析中的应用

通过收集唐钢2500 m3高炉生产数据,结合六西格玛管理技术对铁水硅含量与高炉操作参数的相关性进行回归分析,确定了影响铁水硅含量主要因素。通过稳定热风压力、炉内压差、热风温度、铁水温度等操作条件,显著提高了唐钢高炉铁水硅含量的稳定性。     

高炉硅还原机理探讨和研究

实验高炉解剖、生产高炉取样、理论计算和实验室研究表明,高炉内硅还原发生在炉缸渣层以上部位,即炉腹区。在炉缸下部渣铁接触界面上将进行[Si]的再氧化。为确定硅还原机理,进行了硅源与铁水完全分离条件下的硅还原实验,它充分证明了高炉内硅通过气相SiO还原进入铁水是完全可信的。     

高炉冶炼硅锰合金探讨

作了高炉炉缸反应的热力学分析和热平衡估算,认为只要具有较高的风温、合适的配料和正确的操作,高炉冶炼硅锰合金是完全可能的。分别估算了高炉冶炼硅锰合金的能源消耗和生产成本,认为在我国现有锰矿资源条件下,高炉冶炼硅锰合金将是有前途的。     

韶钢7号高炉低硅冶炼实践

韶钢7号高炉近一年来采用低硅冶炼技术使生铁含硅量一直控制在0.38%～0.45%的较低水平。本文通过分析韶钢7号高炉生产操作指标,分别从原材料因素、操作因素、以及冶炼特点等诸方面详细地介绍、分析了低硅冶炼操作,为高炉达到稳定的低硅生产提供参考思路。     

Benzimidazole resistance in cyathostomes in horses in the Ukraine

The efficacy of treatment with cambendazole was tested in 1-year-old horses on a farm in Dubrovka, Ukraine. Thirty-five horses were treated. Their egg output was compared on the day of treatment and 14 days later with that of 33 untreated horses. Before treatment the mean number of eggs g-1 faeces was 614 in the controls and 766 in horses that had been treated. After 14 days the mean egg output in the controls was 580 and in the treated horses 369. This means a reduction of 54.5%. Only cyathostome larvae could be cultured from faeces collected after treatment. It can be concluded that benzimidazole resistance in cyathostomes is present in the Ukraine.     

重庆高校推进产学研合作的案例分析

以重庆大学、重庆邮电大学和重庆理工大学为例,剖析重庆高校推进产学研合作的基本模式,已经取得的突出成绩,分析总结其基本经验.从完善政策法规体系、强化经济调控、建立组织机构、加强中介建设及开展国际产学研合作等方面,提出了深入推进重庆高校产学研合作的对策建议.     

Apoptosis in experimental myocardial infarction in situ and in the perfused heart in vitro

We report the appearance of apoptotic cells in experimental myocardial infarction (rabbit heart) in in situ and in vitro preparations. Apoptosis was recognized by intravital staining with Hoechst 33342 (Ho342), by nick-end labeling (TUNEL) and by DNA laddering. A steady rise in the relative number of apoptotic cardiomyocytes (apoptotic index) was noted in in situ preparations. Apoptosis was first noted 6 h after the onset of ischemia with its highest value occurring after 72 h. Apoptotic nuclei were absent in remote areas of the left and right ventricles. Apoptotic nuclei within the infarcted area showed diminished intensity of Ho342 fluorescence. Three days after ischemia, a border zone adjacent to the infarcted area consisting of apoptotic macrophages was recognized. A novel finding was the appearance of apoptotic cardiomyocytes in the isolated perfused ischemic heart. Occurring as early as 50 min after the onset of ischemia, a high apoptotic index was present adjacent to the ligature placed around the coronary artery. This observation provides the opportunity to selectively examine factors leading to apoptosis in the ischemic heart under controlled experimental conditions.     

Fractures in childhood in Khartoum

A prospective study of fractures in 231 children received at Khartoum North Teaching Hospital(KNTH) was carried out for a period of six months. The incidence of child fracture rated as one per day, then it increased from the age of 5 years onwards in boys and between 6 and 8 years in girls. Most injuries were sustained during the day time, especially between late afternoon and sunset. 82% of injured children presented to a medical facility, while 18% were taken to native healers first. Non-road traffic accidents accounted for 84% of the fractures mainly due to sports, domestic injuries and falls; whereas road traffic accidents were 16% and occurred mainly in pedestrians. Forty three percent of the fractures needed only first aid and splintage while 42% needed closed reduction. Thirty one percent of all patients were treated as inpatients. The long bones were affected in 91% of all fractures, the commonest site being the distal end of the forearm (26%), followed by supracondylar fracture of the humerus (15.6%). In the upper limb, left-sided fractures predominated. The epiphyseal injuries were 3.5% of all fractures, mainly at the distal radial epiphysis. Boys were commonly affected between 13-15 years of age. Open fractures constituted 9.8% of the series and were mainly due to traffic accidents in town dwellers, the most vulnerable bones were those of the leg and foot. Pathological fractures accounted for 2.2% and were due to bone cysts and osteogenesis imperfecta. The problem of child safety and the preventive measures need to be more stressed.     

Botulism in Poland in 1996

A model is presented in which ion translocation through the F0 part of the ATP synthase drives the rotation of the ring of c subunits (rotor) versus the a subunit (stator). The coupling ion binding sites on the rotor are accessible from the cytoplasm of a bacterial cell except for the c subunit at the interface to the stator. Here, the binding site is accessible from the periplasm through a channel formed by subunit a. In the ATP synthesis mode, a coupling ion is anticipated to pass through the stator channel into the binding site of the adjacent rotor subunit, following the electrical potential. Occupation of this site triggers, probably by electrostatic forces, the rotation of the ring. This makes the binding site accessible to the cytoplasm, where the coupling ion dissociates. Simultaneously, this rotation moves again an empty rotor subunit into the contact site with the stator, where its binding site becomes loaded and rotation continues.     

Problems in falling in love

Certain patients enter psychoanalysis because of their inability to love another person. Often they report a repetitive erotic pursuit of desired partners, without being able to experience or maintain loving feelings. Kernberg has understood such difficulties as representing effects of early narcissistic disappointments and/or of difficulties in resolving oedipal conflicts. In this paper, Lacanian concepts of the mirror phase and symbolic love are employed to develop these issues. Sexualization of problems in mirroring may be fused with oedipal conflicts in some cases. An extended vignette is presented to illustrate the technical and theoretical issues.