检索结果-南通市图书馆

Control Model of Bloom Dynamic Soft Reduction

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2010年第9期17卷 31-35页

作者： CHEN Yong JI Cheng ZHU Miao-yong wu guo-rong Department of Material Research Panzhihua Iron and Steel Research Institute Panzhihua 617000 Sichuan China School of Materials and Metallurgy Northeastern University Shenyang 110004 Liaoning China

There are significant effects of process parameters on internal qualities of bloom, and these process parameters are as follows. position and reduction amount, reduction distribution, reduction rate, and so on. Developing a control model is the key to apply soft reduction technology successfully. As the research object, 360 mm ×450 mm bloom caster in PISCO （Panzhihua Iron and Steel Co. ） has been studied, and the research method for control model of dynamic soft reduction has been proposed. On the basis of solidification and heat transfer model, the position of soft reduction and reduction distribution of each frame are determined according to the bloom temperature distribution and solid fraction in bloom center calculated. Production practice shows that the ratio of center porosity which is less than or equal to 1.0, increased to 97.27%, ratio of central segregation which is less than or equal to 0.5, increased to 80.91%, and ratio of central carbon segregation index which is more than or equal to 1.10, decreased to 4% with the applying model of dynamic soft reduction.

关键词： bloom continuous casting dynamic soft reduction control model center porosity central segregation

A learning-based method to detect and segment text from scene images

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第4期8卷 568-574页

作者： JIANG Ren-jie QI Fei-hu XU Li wu guo-rong ZHU Kai-hua Department of Computer Science and Technology Shanghai Jiao Tong University Shanghai 200240 China

This paper proposes a learning-based method for text detection and text segmentation in natural scene images. First, the input image is decomposed into multiple connected-components (CCs) by Niblack clustering algorithm. Then all the CCs including text CCs and non-text CCs are verified on their text features by a 2-stage classification module, where most non-text CCs are discarded by an attentional cascade classifier and remaining CCs are further verified by an SVM. All the accepted CCs are output to result in text only binary image. Experiments with many images in different scenes showed satisfactory performance of our proposed method.

关键词： Text detection Text segmentation Text feature Attentional cascade

在线全文

学校读者我要写书评

暂无评论

柔性梁大变形计算的一种新方法(英文)

计算力学学报 2010年第4期27卷 727-732页

作者：吴国荣断江海洋学院船舶与建筑工程学院舟山316004

研究了柔性梁大变形问题。常规Lagrangian有限元格式在处理大变形问题时,由于其单元插值函数不满足位移场的协调性要求,从而需要划分较多的单元,才能得到较好的结果。本文首先推导了Lagrangian坐标描述下的位移场变量满足的协调关系式,... 详细信息

研究了柔性梁大变形问题。常规Lagrangian有限元格式在处理大变形问题时,由于其单元插值函数不满足位移场的协调性要求,从而需要划分较多的单元,才能得到较好的结果。本文首先推导了Lagrangian坐标描述下的位移场变量满足的协调关系式,利用此关系式给出了位移场协调的非线性单元插值函数。基于虚功原理导出了梁大变形问题的非线性控制方程,数值计算结果证明了本文方法的正确性和有效性。

关键词：大变形梁有限元插值函数非线性

Quality Control for Continuously Cast Slab of High Strength Weathering Steel Q450NQR1

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2011年第S1期18卷 557-562页

作者： CHEN Yong,PAN Hong,wu guo-rong (Material Research Department of PanGang Group Research Institute Co.Ltd.,Chengdu 611731,Sichuan,China) PanGang Grp Res Inst Co Ltd Mat Res Dept Chengdu 611731 Sichuan Peoples R China

In order to reduce the transverse corner cracks of high strength weathering steel Q450NQR1,the factors influencing transverse corner cracks on continuously cast slab,such as level fluctuation of molten steel in mold,mold taper,primary cooling,mold powder,secondary cooling,nitrogen content in steel,spray nozzle structure,processing parameters and equipment of CC,etc.,were *** on this,a series of comprehensive countermeasures have been *** operation shows by the use of key technologies,including stabilizing steel level,optimizing the mold taper,weakening the primary cooling and the secondary cooling,reforming the mold powder,and adjusting spray nozzle structure,the transverse corner cracks on continuously cast slab have been significantly reduced,and the edge cracks on hot rolled sheet have been eliminated due to the transverse corner *** qualified slabs are delivered to produce weathering cold forming sectional steel,whose yield strength is greater than 450MPa.

关键词： weathering steel cold forming sectional steel HSLA slab continuous casting processing parameters

Study on Metallurgic Effects of M-EMS in Bloom Continuous Casting

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2012年第S2期19卷 997-1000页

作者： LI Zhi-qiang ZENG Jian-hua wu guo-rong PAN Hong CHEN Yong PanGang Group Research Institute Co.Ltd.

In this paper,the M-EMS magnetic field intensity and bloom quality in different periods is counted,and on this basis,the effect of magnetic field intensity of M-EMS on casting bloom quality is *** order to get the exact effect of M-EMS on bloom quality,different magnetic field intensity in a single strand is gotten through changing the current intensity of ***,the corresponding test samples of casting bloom under different magnetic field intensity are sent to give a *** this basis,the effect of magnetic field intensity on bloom quality is studied in a single *** then the metallurgic effects of bloom M-EMS in Pangang are evaluated and the using standard of M-EMS is established.

关键词： EMS continuous casting mold bloom quality

在线全文

学校读者我要写书评

暂无评论

声辐射问题的一种新的无限元方法

船舶力学 2009年第4期13卷 641-645页

作者：吴国荣浙江海洋学院船舶与建筑工程学院浙江舟山316004

声波在无限大外域中的传播和衰减问题是研究声与结构相互作用的重要基础。该文提出了一种新的声无限单元耦合有限元方法于外域声辐射问题的计算。应用加权残值法推导了声无限单元的刚度矩阵和质量矩阵,选取的形函数及权函数充分考虑了... 详细信息

声波在无限大外域中的传播和衰减问题是研究声与结构相互作用的重要基础。该文提出了一种新的声无限单元耦合有限元方法于外域声辐射问题的计算。应用加权残值法推导了声无限单元的刚度矩阵和质量矩阵,选取的形函数及权函数充分考虑了外域声传播的基本特点及无穷远辐射边界条件。计算实例表明这种方法对于求解无界域声场问题是非常有效的。

关键词：无限元声场辐射结构声耦合

在线全文

学校读者我要写书评

暂无评论

非线性不确定结构动力响应的区间逐步离散法

振动与冲击 2008年第4期27卷 153-154,158页

作者：戎瑞亚吴国荣何锃浙江海洋学院船舶与建筑学院舟山316004 华中科技大学土木工程与力学学院武汉430074

对非线性结构中的不确定性参数用区间表示,提出用区间逐步离散法求解结构动力响应。即将不确定性参数取区间离散点的值,将区间动力方程的求解转化为相应确定性问题,再搜索方程解中的最大和最小值来确定结构动力响应的边界。用算例对此... 详细信息

对非线性结构中的不确定性参数用区间表示,提出用区间逐步离散法求解结构动力响应。即将不确定性参数取区间离散点的值,将区间动力方程的求解转化为相应确定性问题,再搜索方程解中的最大和最小值来确定结构动力响应的边界。用算例对此法进行了验证。

关键词：非线性不确定结构动力响应区间分析逐步离散

在线全文

学校读者我要写书评

暂无评论

内蒙古区域经济发展的综合评价与优势分析

数学的实践与认识 2018年第13期48卷 18-25页

作者：吴国荣内蒙古农业大学理学院

为了制定内蒙古区域经济协同发展的有效政策，需要对各区域的经济发展状况做综合评价和优势分析．运用主成分分析筛选出了评价内蒙古区域经济发展的重要经济指标，在此基础上应用熵权灰色关联综合评价法对各个盟市的经济实力近行了综合... 详细信息

为了制定内蒙古区域经济协同发展的有效政策，需要对各区域的经济发展状况做综合评价和优势分析．运用主成分分析筛选出了评价内蒙古区域经济发展的重要经济指标，在此基础上应用熵权灰色关联综合评价法对各个盟市的经济实力近行了综合排序．利用双标图方法对区域与经济指标的相互关系进行了优势分析．其相关结论和建议为内蒙古经济全面协调可持续发展提供潜在的科学依据和决策参考．

关键词：主成分分析熵权灰色关联分析优势分析

应用分形有限元方法于外域辐射和散射声场分析

在线全文

学校读者我要写书评

暂无评论

船舶力学 2011年第1期15卷 182-188页

作者：张晓君吴国荣浙江海洋学院船舶与建筑工程学院浙江舟山316004

应用二级分形有限元方法计算了外域声场。用一人工边界把外域声场分为两部分,人工边界以内使用常规有限元方法,人工边界以外的无限大区域使用分形有限元方法。使用分形有限元方法,一方面形成几何自相似网格使得相邻层之间的单元刚度矩... 详细信息

应用二级分形有限元方法计算了外域声场。用一人工边界把外域声场分为两部分,人工边界以内使用常规有限元方法,人工边界以外的无限大区域使用分形有限元方法。使用分形有限元方法,一方面形成几何自相似网格使得相邻层之间的单元刚度矩阵和质量矩阵具有非常简单的关系,另一方面引用自动满足无限远辐射条件的全域插值函数把节点自由度变换为一组广义坐标,因而计算量可以大大减少。数值计算结果表明:该方法对于计算无限大外域声场是有效的。

关键词：声辐射散射分形有限元