SK5弹簧钢(/%:0.75~0.84C,≤0.35Si,≤0.40Mn,≤0.035P,≤0.0305)经100 t EAF-LF-VD-CC流程生产。通过EAF出钢加硅锰合金和铝铁进行预脱氧,LF精炼过程添加80~150 kg铝镁钙和少量硅锰合金进行复合铝脱氧,精炼渣碱度11.13,(CaO)/(Al_2O_3)...SK5弹簧钢(/%:0.75~0.84C,≤0.35Si,≤0.40Mn,≤0.035P,≤0.0305)经100 t EAF-LF-VD-CC流程生产。通过EAF出钢加硅锰合金和铝铁进行预脱氧,LF精炼过程添加80~150 kg铝镁钙和少量硅锰合金进行复合铝脱氧,精炼渣碱度11.13,(CaO)/(Al_2O_3)=4.98等工艺措施,脱氧效果较明显,铸坯中平均全氧含量达到11×10^(-6),铸坯中氮含量达到35×10^(-6)。冶炼过程夹杂物种类按纯Al_2O_3、硫化物→MgO·Al_2O_3·CaO→MgO·Al_2O_3.CaO.SiO_2变化,铸坯中夹杂物主要为CaO·Al_2O_3·SiO_2·MgO系,其塑性化程度可通过调整精炼渣成分、降低精炼渣熔点实现进一步优化。展开更多
In this paper,using data for the Bist 100 index,we investigate the presence of nonlinearities by employing several nonlinearity tests.The Brock,Dechert,and Scheinkman(BDS)and runs tests were first applied to the serie...In this paper,using data for the Bist 100 index,we investigate the presence of nonlinearities by employing several nonlinearity tests.The Brock,Dechert,and Scheinkman(BDS)and runs tests were first applied to the series to show an initial indication of nonlinearity.The findings for the BDS and runs test of randomness were followed by other sets of direct nonlinearity tests developed by White(1989),Terasvirta(1993),Keenan(1985),and Tsay(1986).Also,the Threshold Autoregression(TAR)test is employed as a final test to confirm the existence of nonlinearity in the Turkish stock exchange market.From the results of the nonlinearity test,it is concluded that the Bist 100 index is characterised by the presence of nonlinearities and cycles.This finding is in contrast with the efficient market hypothesis(EMH)implying that the Turkish stock exchange market is inefficient.展开更多
文摘SK5弹簧钢(/%:0.75~0.84C,≤0.35Si,≤0.40Mn,≤0.035P,≤0.0305)经100 t EAF-LF-VD-CC流程生产。通过EAF出钢加硅锰合金和铝铁进行预脱氧,LF精炼过程添加80~150 kg铝镁钙和少量硅锰合金进行复合铝脱氧,精炼渣碱度11.13,(CaO)/(Al_2O_3)=4.98等工艺措施,脱氧效果较明显,铸坯中平均全氧含量达到11×10^(-6),铸坯中氮含量达到35×10^(-6)。冶炼过程夹杂物种类按纯Al_2O_3、硫化物→MgO·Al_2O_3·CaO→MgO·Al_2O_3.CaO.SiO_2变化,铸坯中夹杂物主要为CaO·Al_2O_3·SiO_2·MgO系,其塑性化程度可通过调整精炼渣成分、降低精炼渣熔点实现进一步优化。
文摘In this paper,using data for the Bist 100 index,we investigate the presence of nonlinearities by employing several nonlinearity tests.The Brock,Dechert,and Scheinkman(BDS)and runs tests were first applied to the series to show an initial indication of nonlinearity.The findings for the BDS and runs test of randomness were followed by other sets of direct nonlinearity tests developed by White(1989),Terasvirta(1993),Keenan(1985),and Tsay(1986).Also,the Threshold Autoregression(TAR)test is employed as a final test to confirm the existence of nonlinearity in the Turkish stock exchange market.From the results of the nonlinearity test,it is concluded that the Bist 100 index is characterised by the presence of nonlinearities and cycles.This finding is in contrast with the efficient market hypothesis(EMH)implying that the Turkish stock exchange market is inefficient.
