天铁焦炭钝化的试验探讨

为了提高焦炭质量,改善焦炭的热反应性和反应后强度,在不同的喷洒时间将不同浓度的钝化剂溶液分别作用在两种强度的焦炭表面上,进行焦炭热性质的试验和探讨.试验结果表明钝化剂浓度和焦炭本身的质量对焦炭的热性能影响很大,而钝化剂的喷洒时间对焦炭热性能没有影响.     

采用喷洒钝化剂方式改善焦炭热性能的实验研究

向焦炭表面喷洒钝化剂溶液可以改善焦炭热态强度.实验室研究了钝化剂溶液浓度和喷洒量两因素对焦炭反应性(CRI)、反应后强度(CSR)的影响规律.实验表明,钝化剂溶液浓度是主要影响因素,工业上实施该技术时,提高钝化剂溶液浓度就可以达到进一步改善焦炭热态性能的目的.     

焦炭喷洒钝化剂的试验研究

对首钢使用的6种焦炭进行钝化剂处理试验。实验室实验结果表明：几种焦炭试样喷洒钝化剂后，反应性都降低，反应后强度都得到提高，尤其是浓度为3％的钝化剂溶液效果更加明显。工业试验结果表明：焦炭喷洒钝化剂以后，有利于促进高炉顺稳生产、降低焦比。     

西钢焦炭喷洒钝化剂的工业性试验分析

<正>为了改善焦炭热态指标,降低焦比及炼铁成本,对焦炭钝化剂采购引入竞争机制,在580m3高炉所用的焦炭上进行了喷洒钝化剂工业生产对比试验。1工业生产试验安排10月3日以前580m3高炉焦炭喷洒第一家钝化剂;10月4日8:00时开始第一家焦炭钝化     

喷洒焦炭钝化剂的生产实践

针对高炉焦比不断降低,煤比不断提高,高炉透气性和透液性变差的实际情况,本钢炼铁厂在6号高炉进行了喷洒焦炭钝化剂的试验,同时介绍了7号高炉采用喷洒钝化剂焦炭的实际应用效果。实践表明,将钝化剂按一定比例均匀地喷洒在焦炭表面后,焦炭反应性得到了提高,高炉实现了顺行。     

硼酸基钝化剂钝化柳钢焦炭的研究试验

通过实验室研究和半工业试验，测定以硼酸基为主的钝化剂对焦炭热反应性和热反应后强度的影响，并对使用不同钝化剂饨化的焦炭样进行微观对比分析。     

钝化焦炭在济钢高炉的应用

济钢采用钝化剂对焦炭进行处理，改善了焦炭的冶金性能，钝化焦炭在高炉上的应用也取得了较好效果。     

焦炭钝化添加剂的研究现状与发展趋势

对国内焦炭钝化添加剂的实验研究进行综述,总结出不同钝化剂钝化效果、钝化方式的特点以及硼酸的钝化作用机理。阐述硼系化合物优良的焦炭热性质改善性能;分析硼酸3个方面的钝化作用,提出进一步研究低廉钝化剂和高效钝化方式的研究方向。     

焦炭钝化剂溶液对金属结构腐蚀及耐火材料侵蚀的实验研究

通过实验,研究了钝化剂水溶液对金属的腐蚀规律以及炉渣对高炉炉缸耐火材料的侵蚀规律.实验结果表明,高炉使用钝化剂水溶液处理过的焦炭后,不会对金属构件的寿命产生影响.     

焦炭与氧反应的负催化研究

在用浸泡的方法将硼酸和ZOC负载于焦炭之后,通过热重分析试验考察了硼酸和ZOC吸附量对焦炭氧化反应的影响。其结果表明,硼酸和ZOC对焦炭与氧的反应"负催化"作用很明显,可以抑制焦炭的溶损反应;用硼酸或ZOC水溶液浸渍焦炭,硼酸或ZOC以分子或"离子"状态高度分散和吸附在焦粉的表面和孔隙之中,可以高效降低燃烧速率,将大大减少钝化剂的用量。     

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.