抓好基本功训练 迅速发展连铸生产

叙述了连铸钢水的冶炼工艺及操作．连铸工艺操作及连铸生产管理方面的一些关键问题。     

带钢生产新工艺

介绍了４种带钢生产的新工艺,即薄板连铸连轧工艺、薄带连铸工艺、连铸冷轧工艺、金属喷镀工艺,对带钢生产工艺的选择及采用有借鉴意义。     

青山钢铁321不锈钢连铸工艺开发

青山钢铁公司采用IF→AOD→LF→CC的生产工艺,用R10米弧形连铸进行了321连铸工艺的试验研究。通过对321不锈钢钢种特性的研究,找出了影响321不锈钢连铸工艺的关键环节和影响连铸坯质量的主要因素,成功开发了321不锈钢连铸工艺。     

《连铸》2022年“连铸坯质量与夹杂物控制”专刊征稿通知

正为了总结我国钢铁冶金生产中连铸工艺的关键共性技术和取得的创新突破成果,推动连铸工艺科研成果转化和新技术应用,加快连铸工艺新成果、新技术的开发和推广,《连铸》编辑部于2021-2022年策划出版"连铸保护渣"、"连铸工艺与新技术"、"结晶器冶金技术与装备"、"连铸坯质量与夹杂物控制"、"中间包冶金技术与钢液洁净化"、"连铸电磁冶金技术与装备"、"连铸智能化技术与装备"等7大专刊。     

攀钢全连铸工艺优化与效果

针对攀钢实现全连铸过程中所存在的技术难点,以全脱硫、全精炼、全连铸和炉机匹配为目标,通过采取铁水脱硫工艺优化、一一对应技术、增碳法炼钢工艺、提高转炉供氧强度、提高钢水精炼连续处理能力、优化连铸工艺等技术措施,解决了制约全连铸工艺顺行的瓶颈环节,稳定了全连铸生产,改善了钢水和铸坯质量,为攀钢顺利实现全连铸工艺提供了可靠的技术保障.     

文献简介

最近已经开发了一种称为OHNO连铸工艺(OCC)或称OHNO工艺的新的连铸系统。该工艺使连铸产品的表面光滑,无取向组织,无等轴晶粒、中心偏析和疏松。OCC工艺和传统的连铸工艺的不同点关键在于模型。OCC工艺包括一套加热的模子,它与传统的发生结晶的水冷模子正相反。在传统的工艺系统     

水钢方坯连铸保护渣系列化探讨

连铸保护渣对维持连铸工艺的顺行和提高铸坯表面质量具有重要作用.由于连铸工艺和钢种的差别,对应的连铸保护渣的合理的理化性能也不尽相同.针对水钢小方坯连铸工艺,以钢种的凝固特性为出发点,对连铸保护渣进行了系列化探讨.在结合铸坯表面质量与连铸保护渣性能匹配关系调查的基础上,对目前主要钢种包括低碳钢、中碳钢和高碳钢小方坯连铸保护渣合理理化性能进行了系列规划.     

320mm厚连铸大板坯生产实践

采用转炉冶炼-LF精炼-RH真空精炼—连铸工艺,成功生产了国内最厚的320mm厚连铸大板坯。连铸阶段合理采用轻压下工艺,优化了连铸坯内部质量。     

轴承钢连铸生产的现状

本文介绍了国外采用连铸工艺生产轴承钢的主要公司和厂家、轴承钢连铸生产的工艺特点和有关参数以及轴承钢连铸坯的质量与改进措施。还介绍了国内轴承钢连铸的试生产情况。     

高速连铸的基本工艺条件

本文指出了高速连铸过程中存在的问题，分析了连铸工艺因素对拉坯速度的影响，探讨了实现高速连铸的工艺条件。     

Hematopoietic stem cell transplantation for severe aplastic anemia

Clara cell protein (CC16) is an endogenous anti-inflammatory agent. It is produced mainly in the respiratory and urogenital tracts. CC16 has been quantified in serum, but not in cerebrospinal fluid (CSF). The aim of this study was to examine CSF CC16 in relation to age, gender and serum CC16, and to examine CC16 levels in parturients. If CC16 levels are increased with age and during pregnancy, it may be responsible for the attenuation of inflammatory diseases such as multiple sclerosis during these conditions. CC16 was measured in CSF and serum taken just before Caesarean section (n=33) or just before an elective surgical procedure in females (n=52) or males (n=31). Fetal serum, amniotic fluid, and maternal urine were also sampled during Caesarean section. CC16 levels in CSF did not differ between parturients and an age and gender matched non-pregnant group, but was higher in male than in female patients. There was a significant and positive relationship between age and CSF CC16 levels and between serum and CSF CC16 levels. Fetal CC16 was significantly and positively correlated with amniotic fluid CC16. The present study suggests that CC16 found in CSF originates from passive diffusion from blood, and that CC16 found in amniotic fluid is derived from the fetal lung. During pregnancy, CC16 does not appear to contribute to alterations which occur in the progression of inflammatory disorders.     

唐钢棒材厂热送热装工艺探讨

根据生产实际,在试验的基础上,提出了连铸坯热送热装的保证措施,讨论了棒材厂热送热装的工艺模式。     

Molecular cloning of murine CC CKR-4 and high affinity binding of chemokines to murine and human CC CKR-4

We have cloned the murine homologue of human CC Chemokine Receptor-4 (CC CKR-4). In equilibrium competition binding assays performed in undifferentiated HL-60 cells transfected with human and murine CC CKR-4 cDNA, the IC50 values for the binding of [125I]macrophage inflammatory protein-1 alpha to human and murine CC CKR-4 were 14.5 +/- 9.0 nM and 10.1 +/- 3.0 nM, respectively, and the IC50 values for the binding of [125I]RANTES to human and murine CC CKR-4 were 9.3 +/- 3.0 nM and 5.7 +/- 2.6 nM, respectively. The cDNA clone for murine CC CKR-4 is 1531 bp, and the largest open reading frame encodes a protein of 360 amino acids that is 85% identical to human CC CKR-4. Murine CC CKR-4 was detected in the thymus and T-cell lines by Northern blot analysis. This first report of direct binding of chemokines to CC CKR-4 demonstrates that the highly homologous human and murine receptors have similar binding characteristics and tissue distribution.     

Preservation of hatchery waste by lactic acid fermentation. 2. Large-scale fermentation and feeding trial to evaluate feeding value

Two waste streams from a Leghorn hatchery were preserved and recycled by fermentation with a by-product carbohydrate and extrusion processing into new feed ingredients that were evaluated with broiler chickens. Cockerel chicks (CC) and a 60:40 ratio of CC:shell waste (CC:SW) were fermented in 189-L barrels for 21 d following grinding, then mixing with a liquid culture (0.2%) and carbohydrate source at 15 and 16.66%, respectively. At 2 wk, pH was 4.44 and 5.09 for the CC and CC:SW products compared with higher values of 6.54 and 6.98 for the raw ingredients at the onset. Negligible hydrogen sulfide and no ammonia gas were recorded during the fermentation period. At 21 d, the fermented CC and CC:SW were extruded, dried, and ground to meals containing CP and TMEn levels of 47.4%, 3,187 kcal/kg, and 33.1%, 2,696 kcal/kg, respectively. Broiler chickens were fed a control diet and the CC (5 and 10%) and CC:SW (2.5 and 5%) ingredient diets with corn and soybean meal for 6 wk to evaluate feeding value and carcass yield. Body weight, gain and feed conversion at 42 d for birds fed diets supplemented with CC or CC:SW at all levels were comparable to those of the control. Diets supplemented with hatchery by-product had no negative effect on carcass measurements except ready to cook carcass and wing yield, which were significantly greater for the 10% CC:SW birds than for the control. These data indicate that nutrient dense hatchery by-products can be preserved with fermentation up to 21 d and support broiler live performance and carcass yield as dietary ingredients equal to or better than a corn-soybean meal control.     

Mn-C系活度相互作用参数与温度的关系

实验测定了不同温度下C在Mn-Fe熔体中的溶解度。引用溶液的相互作用参数模型,结合实验结果,引用文献报道的实验数据,通过严格的热力学推导与计算,获得1623～1748K范围适用的Mn-C系中εCC,ρCC和ρCC,C与温度的关系式。计算结果表明,这些关系式既能满足Gibbs-Duhem方程的必要条件εCC+2ρCC+3ρCC,C=0,又能满足C含量高时体系稳定的必要条件1+εCCxC+2ρCCxC2≥0。     

Sex and handedness effects on corpus callosum morphology in chimpanzees (Pan troglodytes).

Findings suggest that in humans, sex and hand preference may be associated with the size of the corpus callosum (CC). The authors measured CC morphology from MRIs in 67 chimpanzees (Pan troglodytes) to see whether similar effects were present in this species. Hand preference was assessed by performance on 4 tasks, and chimpanzees were classified as left-handed, right-handed, or ambidextrous. In a subsequent analysis, the chimpanzees were reclassified into 2 groups: right-handed and left-handed. The results revealed no sex difference in CC area, but significant effects of hand preference were found for several CC regions (rostrum body, anterior midbody, posterior midbody, isthmus, and splenium) and for overall CC size, with left-handed chimpanzees exhibiting significantly smaller CC measurements than right-handed chimpanzees. The results indicate that lateralized hand use in chimpanzees, as in humans, is associated with variation in CC size. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Corpus callosum morphology in normal controls and traumatic brain injury: Sex differences, mechanisms of injury, and neuropsychological correlates.

This study examined the relative cross-sectional area of the corpus callosum (CC) from MRI scans of 166 normal controls and 97 patients who have suffered traumatic brain injury (TBI). The issue of sex differences in the normal CC is addressed with regard to methodological limitations of many previous conflicting reports. Women had larger CC relative to cranial volume than did men, and this appears to be more than simply an artifact of larger heads in men. The TBI sample showed selective atrophy most notable in the genu and isthmus of the CC, which may reflect cortical degeneration from common sites of injury or Wallerian degeneration secondary to diffuse axonal injury at sites other than the CC itself. The splenium of the CC was significantly related to functioning on the Digit Symbol task for the female TBI patients. The observed differences between gender on CC morphology and function may reflect global differences in brain organization. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

连铸保护渣使用过程中几个问题的讨论

本文就连铸保护渣使用过程中出现的问题 (如直接影响铸坯表面及皮下质量等 )进行讨论 ,并结合生产实践提出了选择连铸保护渣要结合具体的钢种及连铸工艺的原则     

The effect of CC14 on uterine ornithine decarboxylase (ODC) in the rat. Inhibition by CC14 of the induction of ODC by E2 and o,p'DDT

The oral administration of carbon tetrachloride (CC14) to ovariectomized rats markedly inhibited the elevation of uterine decarboxylase (ODC) by estradiol-17beta (E2) and by 1-(o-chlorophenyl)-1-(p-chlorophenyl)-2,2,2-trichloroethane (o,p'DDT). The inhibition of ODC induction by CC14 does not appear to be mediated by the formation of an inhibitor of ODC activity. CC14 treatment caused no observable alteration in the uterine cytosolic E2 receptor. Namely, there was no alteration by CC14 in the number of E2 binding sites, in the affinity of the receptor for E2 or in the sedimentation constant of the 8S receptor. Furthermore, the possibility that CC14 inhibition of ODC induction is a resultant of an initial stimulation of this uterine enzyme by CC14 was excluded. The potential inhibitory effect of CC14 by direct of indirect route on uterine protein synthesis is discussed.     

A comparative MRI study of the relationship between neuroanatomical asymmetry and interhemispheric connectivity in primates: Implication for the evolution of functional asymmetries.

The authors tested the theory that hemispheric specialization evolved as a consequence of reduced interhemispheric connectivity by examining whether neuroanatomical asymmetries were associated with variation in the ratio of corpus callosum size to brain volume (CC:VOL) and to neocortical surface area (CC:NEO) in human and nonhuman primates. Magnetic resonance images were collected in a sample of 45 primates including 8 New World monkeys, 10 Old World monkeys, 4 lesser apes, 17 great apes, and 6 humans. CC:VOL and CC:NEO were determined and correlated with measures of brain asymmetry. The results indicate that brain asymmetry significantly predicted CC:VOL and CC:NEO. Subsequent analyses revealed that species variation in functional asymmetries in the form of handedness are also inversely related to CC: NEO. Taken together, these results support the hypothesis that leftward brain asymmetries may have evolved as a consequence of reduced interhemispheric connectivity. (PsycINFO Database Record (c) 2010 APA, all rights reserved)