GCr15中型材表面废品产生原因探讨

本文通过对5个炉号GCrl5全扒皮钢坯成材生产试验，以及对加热、轧制和精整等生产环节的研究调查，得出一些试验数据，对实验结果进行了分析讨论，发现产生钢材裂纹的主要原因是上工序坯料带来的，表面废品中有部分是划线。     

QCr0.5铬青铜熔炼工艺的改进

根据以往的生产经验，并通过多次反复试验，对QCr0．5铬青铜的传统熔炼工艺进行了改进。实际生产表明，采用新的熔炼工艺可显著降低生产成本，提高铸锭合格率。     

锰铝合金开发试验

本试验采用0．5吨中频炉，以中碳锰铁、废旧铝粒、废旧钢材按一定比例重熔兑对试验生产出企业需要的锰铝合金，方法可行，具有一定的经济效益。     

焦粉粒度分布对铁矿石烧结指标的影响

焦粉粒度对烧结生产指标具有重要的影响。通过烧结杯试验开展焦粉粒度最佳组成的试验研究。结果表明，焦粉粒度从小于1 mm增加到5~8 mm时，烧结矿强度、烧结利用系数、固体燃耗、产量、垂直烧结速度及粒度分布均变差；烧结生产所使用的焦粉粒度组成可根据生产目标进行调整，当要求烧结矿转鼓强度达到最高值时，焦粉的粒度分布应当是57.20%的小于1 mm、25.63%的1~3 mm、11.17%的3~5 mm和6.00%的5~8 mm。当焦粉由鞍钢实际生产的粒度分布调整为最佳粒度分布时，烧结原料矿化过程合理，烧结矿转鼓强度增加1.48%，产量增加1.73%，10~40 mm的烧结矿增加2.16%，固体燃耗降低0.69 kg/t，冶金性能指标明显改善。研究结果对烧结生产中合理控制焦粉粒度分布具有一定的理论指导作用。     

锻钢冷轧辊耐磨性和抗热冲击性试验研究

耐磨性和抗热冲击性是锻钢冷轧辊的重要使用性能指标，对邢台机械轧辊（集团）有限公司生产的Cr3系列、Cr5锻钢冷轧辊的耐磨性和抗热冲击性进行了试验研究，结果表明Cr5锻钢冷轧辊比Cr3系列具有更高的耐磨性和抗热冲击性。     

Q235中板表面纵向裂纹分析

通过生产试验，对Q235中板表面纵向裂纹进行检测和分析。确认了板坯原始裂纹是造成中板边部纵向裂纹的根源。经过对板坯连铸工艺调整和技术攻关，使裂纹缺陷得到有效控制，板坯裂纹缺陷比例由5．3％降到1．4％。     

LD7-5,LD7-6合金棒材工艺研究

LD7－5、LD7－6合金棒材是航空新型发动机的重要材料之一，由于其特殊用途，材料对性能和低倍组织指标有较高要求，作者在对LD7－5、LD7－6两合金的特性进行了全面分析后，从化学成份、挤压温度，淬火时效制度等方面作了较为全面的试验研究，最终确定了生产这两种合金棒材的最佳工艺制度。     

优化炼焦配煤改善焦炭质量

首钢焦化厂4，5号焦炉炉龄老化，焦炭强度较低，通过系统研究、分析单种煤的炼焦性能，确定了提高焦炭强度的配煤方案，并经过配煤炼焦试验及生产攻关，解决了生产中的问题，并对炼焦煤的资源进行优化配置，尽量改善焦炭强度，满足炼铁需求。     

82B预应力钢丝拉拔试验

本介绍了Φ5．0mm82B预应力钢丝拉拔试验，分析了酒钢82B硬线的性能状况，及酒钢钢丝绳厂生产Φ5．0mm82B预应力钢丝的可行性。     

首次生产出热镀锌汽车面板并通过认证

[本刊讯]3月末，本钢在成功稳定批量生产冷轧O5汽车面板后，以研制、生产出5吨热镀锌汽车面板，在华晨一次试验成功，通过认证，将用于“中华尊驰”轿车左右翼子板制件，共483件。这标志着本钢成为国内仅有几家能生产热镀锌汽车面板的钢铁企业。     

论从实践理解世界的物质性和自然世界的先在性

马克思主义唯物论是一种物本主义形态的唯物论,还是一种超越物本主义形态、从实践理解世界的本质相关问题的实践的唯物主义的唯物论?这是一个我们必须搞清楚的有关马克思主义唯物论的本质规定性和精神实质的重大问题.在考察物本主义的唯物论及其思维方式的局限性的基础上,揭示了马克思主义唯物论是现代的、实践的唯物主义,并重点研讨了马克思主义唯物论关于从实践理解世界的物质性和自然世界的先在性的原理,以期为马克思主义唯物论进一步阐明人类世界的实践性原理奠定基础.     

Effect of cyproheptadine on the ultrastructure of the neurons of the arcuate nucleus in the hypothalamus of the rat

The data are presented on changes in the rat arcuate nuclear neuron ultrastructure after using cyproheptadine (peritol, Egyt Pharmaceutical Works, Hungary) in a water suspension at a dose of 20 mg/kg once daily during 7 successive days and twice a day within 10 days. It was shown that cyproheptadine decreases the functional activity of the arcuate nuclear neurons, depending on the total amount of the drug used. Cyproheptadine-induced inhibition of the forming neurohormone release from neurons is likely to be one of the mechanisms of its therapeutic effect in Itsenko-Cushing's disease.     

Characteristics of the sympathetic innervation of the nictitating membrane and of the vasculature of the nose and tongue of the cat

Vasomotor responses from the nasal mucosa and tongue, and contractions of the nictitating membrane, were recorded on stimulation of the cervical sympathetic or internal carotid nerves. Preganglionic sympathetic nerve fibres which elicited a membrane response possessed a lower threshold than those which evoked nasal vasoconstriction, while the latter displayed a lower threshold than fibres which evoked tongue vasoconstriction. The sympathetic vasodilator fibres to the tongue whose activity was revealed after alpha-receptor blockade, had a similar threshold to the vasoconstrictor fibres. Membrane contraction, nasal vasoconstriction and occasionally tongue vasoconstriction could be evoked by stimulating the internal carotid nerve. The postganglionic fibres innervating the nasal mucosa had a similar threshold to those of the nictitating membrane, which may indicate that there are small myelinated fibres innervating the mucosa. The preganglionic compound nerve action potential had four major components, S1-S4. S1, S2 and usually S3 fibres were associated with membrane contraction; S2, S3 and sometimes S1 fibres were associated with nasal vasoconstriction; and S3, usually S2 and occasionally S1 fibres were associated with vasoconstriction in the tongue. It is concluded that each of these three groups of nerve fibres, but not S4 fibres, may include fibres associated functionally with the three effectors. There was a considerable difference between the relative amplitude of the responses of the three effectors elicited by stimulation of the cervical sympathetic nerve at frequencies between 0.2 and 2 Hz. Vasoconstrictor responses were relatively larger than membrane contractions suggesting differences in the mechanisms of neurotransmission at the neuroeffector junctions.