The hybrid method composed of clustering and predicting stages is proposed to predict the endpoint phos- phorus content of molten steel in BOF （Basic Oxygen Furnace）. At the clustering stage, the weighted K-means is...The hybrid method composed of clustering and predicting stages is proposed to predict the endpoint phos- phorus content of molten steel in BOF （Basic Oxygen Furnace）. At the clustering stage, the weighted K-means is performed to generate some clusters with homogeneous data. The weights of factors influencing the target are calcu- lated using EWM （Entropy Weight Method）. At the predicting stage, one GMDH （Group Method of Data Handling） polynomial neural network is built for each cluster. And the predictive results from all the GMDH polynomial neural networks are integrated into a whole to be the result for the hybrid method. The hybrid method, GMDH polnomial neural network and BP neural network are employed for a comparison. The results show that the proposed hybrid method is effective in predicting the endpoint phosphorus content of molten steel in BOF. Furthermore, the hybrid method outperforms BP neural network and GMDH polynomial neural network.展开更多
Combined with the parameters of the production process of a steel factory, numerical simulations for a new ladle from preheating to turnover are conducted using the finite element analysis system software （ANSYS）. T...Combined with the parameters of the production process of a steel factory, numerical simulations for a new ladle from preheating to turnover are conducted using the finite element analysis system software （ANSYS）. The measured data proved that the simulated results are reliable. The effects of preheating time, thermal cycling times, and empty package time on steel temperature are calculated, an ideal preheating time is provided, besides, based on the analysis of a single factor and use the nonlinear analysis method, a steel temperature compensating model with di- versified coupling factors is proposed, with the largest error of the present coupling model at 1. 462 ~C, and the er- rors between actual and target steel temperature in tundish after the model is applied to practical production are basi- cally controlled within -4-6 ~C, which can meet the accuracy of the manufacturer and has a practical guiding significance for the production in steelmaking workshops.展开更多
The limitation and experimental CO2 sequestration degree of steel slag is the focus. The theoretical and the practical COe sequestration degree was assessed under mild operating conditions. After calculation in theory...The limitation and experimental CO2 sequestration degree of steel slag is the focus. The theoretical and the practical COe sequestration degree was assessed under mild operating conditions. After calculation in theory, it can be found that the CO2 sequestration limitation degree for every kilogram steel slag is about 442 g when taking magne- sium into consideration, and the experimental CO2 sequestration degree for every kilogram slag is about 77 g, under the conditions that the liquid to solid ratio is 50 L/kg, CO2 flow is 0.5 L/min and the temperature of reaction is the ambient temperature. When solution NH4Cl and CHa COOH for experiments and other conditions keep the same, the actual potential CO2 sequestration for every kilogram slag is 69.3 g and 31.20 g respectively. Thus, optimization of process parameters like granularity of slag is necessary to enhance the carbon dioxide sequestration degree for steel slag.展开更多
目的研究半胱氨酸蛋白酶抑制因子Cystatin 6(CST6)在结肠癌中的表达及其与肿瘤血管生成的关系。方法利用肿瘤基因组图谱数据库(The Cancer Genome Atlas,TCGA)分析CST6在正常结肠上皮、无转移性结肠癌和转移性结肠癌组织中的表达差异,...目的研究半胱氨酸蛋白酶抑制因子Cystatin 6(CST6)在结肠癌中的表达及其与肿瘤血管生成的关系。方法利用肿瘤基因组图谱数据库(The Cancer Genome Atlas,TCGA)分析CST6在正常结肠上皮、无转移性结肠癌和转移性结肠癌组织中的表达差异,并探讨其表达高低与结肠癌预后的关系。同时,采用基因富集分析(gene set enrichment analysis,GSEA)及免疫组化方法探究结肠癌中CST6所影响的信号通路及可能的作用机制。结果(1)CST6在结肠癌中的表达明显高于正常结肠上皮,转移性结肠癌中CST6表达水平明显高于无转移结肠癌;(2)具有高CST6表达水平的结肠癌患者疾病特异性生存期以及无进展生存期显著缩短;(3)GSEA分析提示在结肠癌中CST6高表达的患者中,上皮-间充质转化和血管生成通路显著富集;(4)结肠癌中CST6与血管生成相关因子PDGFR的表达呈现正相关。结论CST6在结肠癌组织中呈高表达,高表达CST6的结肠癌患者预后更差,可能与其促进肿瘤血管生成作用有关,提示其可能在结肠癌中作为一个新型癌基因发挥作用。展开更多
In order to study calcium leaching behavior for the steelmaking slag,factors that influence the leaching yield have been optimized.The results show that granularity of the slag,liquid to solid ratio（in short for L/S...In order to study calcium leaching behavior for the steelmaking slag,factors that influence the leaching yield have been optimized.The results show that granularity of the slag,liquid to solid ratio（in short for L/S）,temperature and reaction time have a significant effect on the leaching yield.The optimal conditions for leaching are determined as follows：1） the granularity at 75 μm,L/S at 100,temperature at 60 ℃;2） the granularity at 75 μm,L/S at 50,temperature at 40 ℃.Finally,the optimal leaching yield under these conditions is about 15%展开更多
文摘目的探讨升-降主动脉人工血管旁路术治疗成人复杂主动脉缩窄的手术效果并总结其临床经验.方法 2015年10月至2018年7月同济大学附属东方医院心外科应用升主动脉-降主动脉人工血管转流术治疗成人复杂主动脉缩窄2例,均为男性,年龄分别为22岁和46岁.两例患者均经桡动脉、足背动脉穿刺测压,根据桡动脉和足背动脉手术前后平均压差变化评价手术效果.结果术后均治愈出院.术前桡动脉和足背动脉平均压差分别为48 mmHg和55 mm Hg;术后桡动脉和足背动脉平均压差6mmHg和9mmHg,较术前明显缩小.术后主动脉CTA复查示转流人工血管通畅.结论升-降主动脉人工血管旁路术是治疗成人复杂主动脉缩窄的有效手段.
基金Sponsored by National Key Technology Research and Development in 11th Five Years Plan of China(2006BAE03A07)Fundamental Research Funds for Central University of China(FRF-AS-09-006B)
文摘The hybrid method composed of clustering and predicting stages is proposed to predict the endpoint phos- phorus content of molten steel in BOF （Basic Oxygen Furnace）. At the clustering stage, the weighted K-means is performed to generate some clusters with homogeneous data. The weights of factors influencing the target are calcu- lated using EWM （Entropy Weight Method）. At the predicting stage, one GMDH （Group Method of Data Handling） polynomial neural network is built for each cluster. And the predictive results from all the GMDH polynomial neural networks are integrated into a whole to be the result for the hybrid method. The hybrid method, GMDH polnomial neural network and BP neural network are employed for a comparison. The results show that the proposed hybrid method is effective in predicting the endpoint phosphorus content of molten steel in BOF. Furthermore, the hybrid method outperforms BP neural network and GMDH polynomial neural network.
基金Item Sponsored by Technology Supporting Program During the 11th Five-Year Plan Period(BAE03A07)
文摘Combined with the parameters of the production process of a steel factory, numerical simulations for a new ladle from preheating to turnover are conducted using the finite element analysis system software （ANSYS）. The measured data proved that the simulated results are reliable. The effects of preheating time, thermal cycling times, and empty package time on steel temperature are calculated, an ideal preheating time is provided, besides, based on the analysis of a single factor and use the nonlinear analysis method, a steel temperature compensating model with di- versified coupling factors is proposed, with the largest error of the present coupling model at 1. 462 ~C, and the er- rors between actual and target steel temperature in tundish after the model is applied to practical production are basi- cally controlled within -4-6 ~C, which can meet the accuracy of the manufacturer and has a practical guiding significance for the production in steelmaking workshops.
基金Sponsored by National Key Technology Research and Development Program in 11th Five-Year Plan of China(2006BAE03A07)
文摘The limitation and experimental CO2 sequestration degree of steel slag is the focus. The theoretical and the practical COe sequestration degree was assessed under mild operating conditions. After calculation in theory, it can be found that the CO2 sequestration limitation degree for every kilogram steel slag is about 442 g when taking magne- sium into consideration, and the experimental CO2 sequestration degree for every kilogram slag is about 77 g, under the conditions that the liquid to solid ratio is 50 L/kg, CO2 flow is 0.5 L/min and the temperature of reaction is the ambient temperature. When solution NH4Cl and CHa COOH for experiments and other conditions keep the same, the actual potential CO2 sequestration for every kilogram slag is 69.3 g and 31.20 g respectively. Thus, optimization of process parameters like granularity of slag is necessary to enhance the carbon dioxide sequestration degree for steel slag.
文摘目的研究半胱氨酸蛋白酶抑制因子Cystatin 6(CST6)在结肠癌中的表达及其与肿瘤血管生成的关系。方法利用肿瘤基因组图谱数据库(The Cancer Genome Atlas,TCGA)分析CST6在正常结肠上皮、无转移性结肠癌和转移性结肠癌组织中的表达差异,并探讨其表达高低与结肠癌预后的关系。同时,采用基因富集分析(gene set enrichment analysis,GSEA)及免疫组化方法探究结肠癌中CST6所影响的信号通路及可能的作用机制。结果(1)CST6在结肠癌中的表达明显高于正常结肠上皮,转移性结肠癌中CST6表达水平明显高于无转移结肠癌;(2)具有高CST6表达水平的结肠癌患者疾病特异性生存期以及无进展生存期显著缩短;(3)GSEA分析提示在结肠癌中CST6高表达的患者中,上皮-间充质转化和血管生成通路显著富集;(4)结肠癌中CST6与血管生成相关因子PDGFR的表达呈现正相关。结论CST6在结肠癌组织中呈高表达,高表达CST6的结肠癌患者预后更差,可能与其促进肿瘤血管生成作用有关,提示其可能在结肠癌中作为一个新型癌基因发挥作用。
文摘In order to study calcium leaching behavior for the steelmaking slag,factors that influence the leaching yield have been optimized.The results show that granularity of the slag,liquid to solid ratio（in short for L/S）,temperature and reaction time have a significant effect on the leaching yield.The optimal conditions for leaching are determined as follows：1） the granularity at 75 μm,L/S at 100,temperature at 60 ℃;2） the granularity at 75 μm,L/S at 50,temperature at 40 ℃.Finally,the optimal leaching yield under these conditions is about 15%
