铝合金拉伸试样表面质量及拉伸速度对拉伸性能的影响

通过对铝合金拉伸试样进行车削破坏,研究试样表面质量对不同合金拉伸性能的影响,以及对不同状态同种合金拉伸性能的影响;同时研究不同拉伸速度对铝合金拉伸性能的影响。由此了解试样表面质量和拉伸速度对性能的影响规律,并在实际检测过程中尽量避免表面质量和拉伸速度产生的影响。     

拉伸试验速度对屈服强度的影响及控制

通过理论分析及实验数据，表明金属拉伸试验速度对屈服强度的影响。并依据国家标准，巾平均应力速率推导负荷速率计算公式，根据负荷速率可以简单、直观、方便地进行日常拉伸试验。确保试验结果的准确性。     

复合后硼纤维的拉伸强度分布特征及其分析

硼纤维的拉伸断裂由缺陷引发,其强度分布符合Ｗｅｉｂｕｌｌ分布函数。对热压复合前后的硼纤维的拉伸强度分布特征进行分析比较,热压复合过程对纤维的性能及拉伸强度分布特征有一定的影响,这主要是因为热压改变了纤维内部缺陷的类型和分布。     

500mm拉伸弯曲矫直机技术改造

本文介绍500mm拉伸弯曲矫直机组的改造方案及改造后的实际矫直效果，探讨了高强度合金钢薄带及双金属薄带的矫直工艺。     

60MN拉伸机技术改造

作者简要介绍了西南铝业(集团)有限责任公司实施60MN拉伸机技术改造的情况，包括液压系统改造，电控系统改造和主要技术要点等内容。     

套管屈服强度测试技术研究

对套管屈服强度测试的特点及影响因素进行了综合分析，形成了适合德国SCHENCK RD0600拉伸试验机进行拉伸试验的测试技术，对提高套管屈服强度测试的准确性提供了依据。     

金属拉伸过程中的拉伸应力及影响因素

电线电缆、线圈绕组线及灯泡的钨丝等都是经过金属拉伸制成的。许多触点导电材料，如开关上的银镍合金触点、电路板上的微细铝硅丝接点线(直径0．01毫米以下)也是金属拉伸制品。研究金属拉伸过程中的拉伸应力及影响因素，是保证拉伸过程顺利进行及成品质量的关键。     

宝钢T91高压锅炉管性能试验与研究

论述了对宝钢T91高压锅炉管所做的高温拉伸、持久强度、抗氧化性等试验成果，并就宝钢T91性能稳定性进行了讨论。试验表明，宝钢T91高压锅炉管性能稳定，可用于电站锅炉的制造。     

液压拉力试验机微机改造及网络应用系统

介绍了液压拉力试验机的微机改造,对改造后自动拉伸测试系统的组成、操作使用及测量精度作了详细的分析研究,结果表明液压拉力试验机的微机改造可使非电拉试验机测试能力提高一个水平,值得推广。该系统完全能满足GB228—87《金属拉伸试验方法》标准要求。     

拉伸试验国内外标准的对比分析

本文对拉伸试验的国家标准、英国版欧洲标准、美国标准的试验性能名称、符号、试验方法的主要技术内容进行了比较，并对标准的不同进行了分析和总结。     

铜尾矿库尾矿全粒径规模化低碳消纳研究

某大型矿冶集团针对该集团铜尾矿库尾矿大量堆存,安全环境风险突出,新建尾矿库选址困难、尾矿消纳途径有限等问题,通过长期摸索研究和对铜尾矿库尾矿粒径分布、成分、化学属性、浸出毒性和放射性等因素进行分析,探索出通过胶凝改造技术充填、制备公路工程无机结合料和铜尾矿资源脱硫分级综合利用的低碳材料消纳模式,尾矿库尾砂能够全粒径规模化消纳利用。单位产品分别消纳尾矿0.075t/t、0.1275 t/t和1t/t,降碳1.564t/t、0.054t/t和0.5195t/t,并分别具有40.0971元/t、12.1235元/t和14.4653元/t的环境正效益,同时协同处置了大量其他固体废物,真正实现了铜尾矿全粒径规模化增值消纳,在全国范围内有很好的借鉴意义。     

Modelling migration: the clock-and-compass model can explain the distribution of ringing recoveries

The present study was carried out to investigate the relative involvement of spinal opioid receptors in the development of physical dependence on intrathecal (i.t.) butorphanol in comparison with i.t. morphine. Dependence was induced by continuous i.t. infusion of butorphanol (52 nmol/h) and morphine (26 nmol/h) for 4 days in male Sprague-Dawley rats. Naloxone, CTOP, naltrindole, and nor-binaltorphimine (nor-BNI) were administered i.t. to precipitate behavioral signs of withdrawal. Administration of i.t. naloxone produced a significantly greater increase in the profile of withdrawal signs in i.t. morphine dependence than that in i.t. butorphanol dependence. An i.t. nor-BNI challenge elicits behavioral signs of withdrawal only in rats dependent on i.t. butorphanol, but not in rats dependent on i.t. morphine. CTOP administered i.t. precipitated withdrawal signs in i.t. morphine dependence that were greater than that in i.t. butorphanol dependence. An i.t. treatment with naltrindole produced equivalent signs of withdrawal in both i.t. butorphanol- and morphine-dependent rats. These results suggest that continuous i.t. butorphanol results in the development of less physical dependence than that of i.t. morphine. Spinal kappa- rather than delta- and mu-opioid receptors play a major role in the development of i.t. butorphanol dependence, whereas spinal mu-opioid receptors play a more important role than delta-opioid receptors in i.t. morphine dependence.     

Product development of Baosteel HFW 610 Mill

Baosteel’s high-frequency electric resistance welded(HFW) 610 longitudinal seam mill(8 5/8″-24″, the yearly output 300000 t) and UOE 1422 longitudinal submerged arc welding(SAW) mill(20" -56",the yearly output 500000 t) are established in 2005 and 2008,respectively.Product specification covers whole of API 5CT standard and most of API 5L standard,terminating the history of manufacturing the medium and large size pipes at Baosteel.The yearly output increased from 1,200000 t to nearly 2000000 t.HFW 610 mill is oriented at mid size pipes,which are mainly linepipe and welded casing.The designed yearly output of HFW mill is 300000 t,including casing of 90000 t,linepipe of 180000 t,round structural pipe of 15000 t and rectangle structural pipe of 15000 t. The yearly output of oil casing line supporting the welding line is 120000 t,among which including welded casing and seamless casing of 30000 t.Baosteel’s HFW 610 longitudinal seam mill was established on October 27,2005. After the equipment trial run In October,2005 - March,2006 and equipment function examination In April,2006 - June,2006,mass production started in July 2006.And in December 2006,monthly designed capacity was achieved,reaching to 30496.644 t in welding pipe and 28 349.939 t in finished pipe.The output of 2006,2007, 2008 and 2009 was 117 067 t,223 554 t,255 791 t,and 204 424 t,with the comprehensive yield ratio 79.4%, 87.8%,90.80%and 91.92%respectively.This study introduces Baosteel HFW 610 Mill which is the world class,energy conservation and environmental protection enterprise,including product orientation,process and new product development.     

水钢3号高炉富氧鼓风实践

水钢3号高炉通过富氧鼓风,使3号高炉的技术经济指标有了进一步的改善和提高,日产量由3 066t/d提高到3 354t/d,焦比从412kg/t降至388kg/t,煤比从112kg/t提高到了138kg/t。     

60t 电弧炉高效化生产的研究

通过优化炉料结构-采用铁水热装技术;集束氧枪技术强化供氧;疏通物流-强化二次精炼和增加连铸生产能力,使1台60t AC炉和1台60t DC炉的年生产率由改造前25.45万t增至87.34万t,冶炼周期由107 min/炉降至71 min/炉,电耗由547 kWh/t降至213 kWh/t,变压器利用系数由3142 t/(MVA·a)增至10783 t/(MVA·a)。探索出适合大冶特钢实际生产的冶炼工艺,取得了良好的经济技术效果。     

70 t电弧炉应用热压块HBI冶炼的工艺实践

70 t电弧炉的炉料装入量为80～81 t,其中热直接还原铁热压块HBI为14.6～15.2 t,铁水23～27 t,其出钢量77～78 t,电耗316～324 kWh/t,氧耗29.7～33.0 m~3/t,冶炼周期48～54 min。生产实践表明,热压块是优质废钢的替代品,可促进电弧炉脱磷和脱碳反应,降低氧耗1.3～3.2 m³/t,但每增加1%热压块则增加电耗3.5kWh/t,所以炉料为全废钢时不宜配加热压块,当加入30%铁水和加入10%热压块时可以达到冶炼过程最优化。     

ACI集束氧枪和BSE炉门碳-氧枪复合吹炼技术在70 t电弧炉上的 应用和改进

在70t DE EAF加铁水25%～45%的情况下,通过合理的供氧模式,根据钢中留碳量和磷含量的要求确定炉渣碱度等工艺措施,采用复合吹炼技术有效地实现脱磷和留碳操作,杜绝了大沸腾事故,铁耗、氧耗、煤气消耗和冶炼周期分别从工艺改进前的1075 kg/t、37 m³/t、8.1 m³/t和54 min降低至1072 kg/t、33 m³/t、7.7 m³/t和52 min。仅电耗从338 kWh/t增至344 kWh/t。     

40 t电弧炉高效化生产实践

兴澄特钢3座40 t电弧炉(变压器容量每座15MVA)经过氧枪等改造和添加铁水等工艺措施优化后,使每炉冶炼时间由3 h降至60～70 min,电耗降至160 kWh/t,氧耗为50 m³/t,电极消耗2.0 kg/t,3座电弧炉年产能力达85万t。操作实践表明,每炉20～25 t的铁水加入量可使40 t电弧炉得到最佳的经济指标。     

Histocompatibility-2 system in wild mice. II. H-2 haplotypes of t-bearing mice

As a first step in the study of the possible relationship between the T/t and H-2 complexes, the H-2 antigenic composition of the strains carrying factors t12, tw32, tw2, tw8, t1, t0, t6, tw1, tw71, tw73, tw12, tw5, tw75, and t38 was studied by using a battery of antisera containing antibodies against inbred-derived H-2 antigens. In addition, five t strains (t12, t6, tw5, tw1, and tw2) were selected for the production of antisera against the H-2 complexes carried by t chromosomes. Spleen, lymph node, and thymus cells from H-2b/t heterozygotes and tw2/tw2 homozygotes were injected into appropriate F1 hybrids between two inbred strains that carried the inbred-derived H-2 antigens of the donor. Four new H-2 antigens and one Ia antigen were uncovered and were assigned the symbols H-2.106 through H-2.109, and Ia.101, respectively. Three new H-2 haplotypes were also described, based upon the H-2 antigenic pattern of three t factors, t12, tw1, and tw5. These new haplotypes were given the symbols H-2t12, H-2tw1, and H-2tw5. When the t factors were grouped according to their H-2 haplotypes, their distribution, with certain exceptions, corresponded to the complementation groups. Thus, t chromosomes in the same complementation group carried similar, if not identical, H-2 haplotypes, despite the fact that these chromosomes were derived from widely separated geographic areas. Such an association between the t and H-2 complexes is most unusual in light of what is known of the polymorphism of H-2 haplotypes in wild mice populations. It suggests more than a casual relationship, at least at the population level, between the t and H-2 loci.     

包钢炼钢厂4#转炉氧枪设计及应用

包钢在90年代初期将原有公称容量50t转炉扩容为80t转炉,同时兴建4＃80t转炉,本文以4＃80t转炉为例,详细介绍了80t转炉氧枪喷头各项参数的设计和选择,然后对80t转炉氧枪的使用作了介绍。