热轧无取向硅钢断面形状的优化控制研究

冷轧无取向硅钢的产品精度需要热轧提供优良的原料保证,热轧厂为冷轧厂提供无取向硅钢冷轧基料的产品断面形状直接遗传到冷轧最终的产品尺寸。热轧全工序在保证产品最终的凸度、楔形及横向厚差方面的精准控制,涉及板坯质量、加热炉烧钢质量、粗轧板形控制、精轧辊型设计、对中轧制及窜辊策略等工艺要点的精准控制,确保了最终的热轧成品断面形状的控制精度,为后工序的冷轧轧制提供断面保证。

避免辊缝偏差大引起堆钢的智能控制方法

精轧机组F7出口仪表检测区环境恶劣,氧化铁皮掉落到厚度检测仪表窗口上,遮挡射线接收造成测量值失真,影响厚度检测及模型设定,极易产生非计划品及堆钢或断辊事故。从4个方面研究解决:(1)从源头控制;(2)如何作好预防;(3)应急处置程序;(4)避免事故扩大化。在解决过程中开发了一种防护装置;并通过使用测厚仪、板形多功能仪、智能识别程序等组成的在线测量,智能识别及应急处置的智能连锁应急处置系统,完全能够杜绝上述事故的发生。并且该过程无需人工判断及操作,避免应急条件下操作工响应时间长及操作失误等不利因素,降低了故障概率,提高了机组运行效率。

聚合物复合材料的摩擦学行为影响因素

随着现代汽车和高端装备技术的迅猛发展,众多运动机构使役工况愈加严苛,使摩擦副经常处于混合润滑甚至边界润滑区间运转,因此,对材料的可靠性和使用寿命提出了更高的要求。聚合物复合材料由于具有优异的自润滑特性、高化学稳定性和性能可设计性,已被广泛应用于水利、水电、航运、海洋作业等高端装备中,因此,设计制备高性能聚合物自润滑材料,研究其摩擦学性能及机理具有重要的现实意义。摩擦学的理论和实践表明,聚合物复合材料-金属配副界面生成转移膜的结构与性能与材料的宏观摩擦学行为密切相关,而且影响转移膜界面生长的物理化学作用极其复杂,除复合材料本身的微观结构外,速度、载荷、润滑介质等工况参数均对聚合物复合材料的摩擦和磨损具有重要的影响。文章综述了聚合物复合材料的微观结构和工况参数对其摩擦学性能的影响规律,分析了填料的尺寸和含量、填料与聚合物基体的界面状态,以及摩擦副界面物理化学作用和转移膜生长的影响机制。最后,结合摩擦界面纳米结构的最新研究进展,提出了聚合物复合材料摩擦学研究的新思路。

The Discovery of Magnesioferrite from Au (Fe, Cu) Magnesian Skarn Deposits and Study of the Magnesioferrite-Magnesiomagnetite Series

Abstract: Magnesioferrite, a rare metasomatic mineral, was discovered for the first time in China from the Qinlou Au (Fe, Cu) magnesian skarn deposit, Sanpu, Huaibei, Auhui Province, and the Mulonggou Fe (Mo, Cu) magnesian skarn deposit, Luonan County, Shaanxi Province. In this paper, the geological setting, mineral associations, chemical composition, some physical properties, X-ray powder diffraction data and infrared spectroscopy of magnesioferrite and magnesiomagnetite are discussed. Magnesioferrite contains 17.66%–13.48% of MgO. Its main associated minerals are clinohumite, chondrodite, serpentine, calcite and magnesiomagnetite. The density of magnesioferrite is 4.537–4.720, reflectances in percent are: 17.8–18.1, hardness is 838–900 kg/mm2, and the cell parameter ao = 8.371–8.379 ?. A systematic study of the magnesioferrite-magnesiomagnetite-magnetite series suggests that along with the increase of magnesioferrite molecules in the mineral, the density, reflectances and cell parameters decrease correspondingly, the hardness heightens, and the infrared absorption spectral band becomes wider. The authors consider that magnesioferrite is a product of contact metasomatism between hypabyssal intermediate-acid intrusions and dolomitic marble. It was formed in shallow exocontact zones under relatively oxidized conditions.

Water in Mantle-derived Xenoliths in the Hannuoba Basalt

: Minerals of various mantle-derived xenoliths from the Hannuoba basalt in Hebei Province have been studied by means of IR spectroscopy. The results show that all xenoliths from the mantle at depths <75 km contain trace amounts of water (0.45%–11.6×10?2% H2O). The data of about 0.1% H2O contained in primary pyrolite estimated by earlier studies may be on the high side. The water might enter the frameworks of olivine, pyroxene and garnet earlier than it entered those of amphibole and phlogopite. The presence of water in amphibole and phlogopite may be a local phenomenon of water enrichment, which is related to relatively small-scale magmatic or metasomatic events although they can contain a hundred times more water than pyroxene contains. There is a little more water (1.11%–3.01×10?2% of H2O mostly) in xenoliths from the Hannuoba basalt than in those from mid-ocean ridge basalt and kimberlites of South Africa (less than 1×10?2% of H2O mostly). This indicates the heterogeneity of water in time and space in the upper mantle. The presence of trace amounts of water in mantle-derived anhydrous silicate minerals provides basic data for us to understand the distribution of water in the upper mantle and the role of water in the mantle dynamic and geochemical processes.

Molecular cloning and structural analysis of human norepinephrine transporter gene(NETHG)

A cDNA molecule encoding a major part of the hu-man Norepinephrine transporter(hNET) was synthesized by means of Polymerase Chain Reaction(PCR) technique and used as a probe for selecting the human genomic NET gene. A positive clone harbouring the whole gene was ob-tained from a human lymphocyte genomic library through utilizing the "genomic walking" technique. The clone, des-ignated as phNET, harbours a DNA fragment of about 59 kb in length inserted into BamH Ⅰ site in cosmid pWE15.The genomic clone contains 14 exons encoding all amino acid residues in the protein. A single exon encodes a dis-tinct transmembrane domaill, except for transmembrane domain 10 and 11, which are encoded by part of two ex-ons respectively, and exon 12, which encodes part of do-main 11 and all of domain 12. These results imply that there is a close relationship between exon splicing of a gene and structural domains of the protein, as is the case for the human γ-aminobutyric acid transporter(hGAT) and a number of other membrane proteins.

等静压成型对多孔聚酰亚胺保持架成孔性能的影响研究

针对空间高精密轴承用多孔聚酰亚胺保持架的等静压成型要求,开展了聚酰亚胺模塑粉的等静压法制备多孔材料的成型工艺研究。从聚酰亚胺模塑粉自身的结构特性、包套软硬质地、冷、热等静压成型工艺调控(温度、压强、时间)等角度,系统研究了结构因素和冷、热等静压工艺因素对多孔聚酰亚胺材料成孔性能的影响,并通过其微观形貌演变提出了聚酰亚胺模塑粉在冷等静压过程中的主要致密化机制为前期的粒子靠近及重排和中后期的剪切变形,在热等静压过程中主要致密化机制为高温高压下的剪切变形和塑性变形,同时利用封存其中的气体受热膨胀实现扩孔,结果表明,冷等静压工艺对最终多孔聚酰亚胺材料的成孔性能的影响更为根本,热等静压的最高温度提高和保压时间延长有利于获得更大的孔径,为后续采用等静压法制备多孔含油保持架材料并根据应用条件进行成孔性能的精确调控提供了科学依据。

Identification of Ser^(354) and Ser^(357) involved in the function of norepinephrine transporter

Conserved Ser 354, Ser 357 in the seventh transmembrane domain of NET were mutated and the function of mutants was studied by 3H-NE influx measurement. Double mutation at these two serine sites reduced the activity of NET to base level. It is inferred that these two sites may be involved in the recognition and transport activity of the NET protein.