A key issue, which influences the applications of magnetic flux leakage testing, is defect quantification. There have been many research on the relationship between width, depth and magnetic flux leakage of slot defec...A key issue, which influences the applications of magnetic flux leakage testing, is defect quantification. There have been many research on the relationship between width, depth and magnetic flux leakage of slot defect. However, the length factor is often ignored. The relationship between characteristics of defect leakage field and defect length was investigated. The magnetic flux leakages of a series of plate specimens with the same width, same depth and different length slot defects were tested under the same magnetizing conditions. Testing results show that defect length is an important parameter needed to consider in quantifying defects.展开更多
A preliminary study by our research group showed that 6-mm-long regeneration chamber bridging is equivalent to autologous nerve transplantation for the repair of 12-mm nerve defects. In this study, we compared the eff...A preliminary study by our research group showed that 6-mm-long regeneration chamber bridging is equivalent to autologous nerve transplantation for the repair of 12-mm nerve defects. In this study, we compared the efficacy of different lengths （6, 8, 10 mm） of nerve fragments bridging 6-mm regeneration chambers for the repair of 12-mm-long nerve defects. At 16 weeks after the regeneration chamber was implanted, the number, diameter and myelin sheath thickness of the regenerated nerve fibers, as well as the conduction velocity of the sciatic nerve and gastrocnemius muscle wet weight ratio, were similar to that observed with autologous nerve transplantation. Our results demonstrate that 6-, 8-and 10-mm-long nerve fragments bridging 6-mm regeneration chambers effectively repair 12-mm-long nerve defects. Because the chemoattractive capacity is not affected by the length of the nerve fragment, we suggest adopting 6-mm-long nerve fragments for the repair of peripheral nerve defects.展开更多
针对低信噪比环境下超声细微缺陷特征提取难题,提出一种适用于低信噪比超声信号的门控残差与双级压缩-激励(squeeze and excitation,SE)注意力协同增强网络。该模型以卷积神经网络(convolutional neural network,CNN)为基础,通过残差块...针对低信噪比环境下超声细微缺陷特征提取难题,提出一种适用于低信噪比超声信号的门控残差与双级压缩-激励(squeeze and excitation,SE)注意力协同增强网络。该模型以卷积神经网络(convolutional neural network,CNN)为基础,通过残差块-SE模块-池化级联结构,在残差块内部嵌入普通SE模块进行初步通道筛选,在网络末端利用局部增强SE模块聚焦峰值信号,并采用门控残差连接从而动态保留原始细微特征,实现噪声抑制与特征增强的协同优化。结果显示:改进后模型的均方根误差(root mean square error,RMSE)均值为0.0683、平均绝对误差(mean absolute error,MAE)均值为0.0471,较基准CNN分别降低49.7%、41.7%,且模型显著优于仅使用单一注意力或残差块的改进模型,验证了双机制协同的优越性,且训练稳定性突出,低信噪比环境下仍保持高精度。所提模型的预测精度、抗干扰能力及稳定性显著优于传统方法与现有模型,为钢管超声无损检测提供高效技术方案,具有重要工业应用价值。展开更多
A statistical distribution function of the dislocation link length,in unit volume of the crystalline materials has been derived theoretically after semi-infinite normalization by as- suming the distribution of actual ...A statistical distribution function of the dislocation link length,in unit volume of the crystalline materials has been derived theoretically after semi-infinite normalization by as- suming the distribution of actual links in all positions of crystalline materials with equal prob- ability,i.e. (l)dl=2ρl_γ^(-4)l^2exp(l^2/l_γ~2)dl where ρ is dislocation density,This assumption seems to be reasonable for polycrystalline fec metallic materials,and confirmation has been found in pure Ni and stainless steel 1Cr18Ni9Ti TEM experiments alresults.展开更多
基金This work was financially supported by the National Natural Science Foundation of China(Grant No.50001006,50305017)China Postdoctoral Science Foundation.
文摘A key issue, which influences the applications of magnetic flux leakage testing, is defect quantification. There have been many research on the relationship between width, depth and magnetic flux leakage of slot defect. However, the length factor is often ignored. The relationship between characteristics of defect leakage field and defect length was investigated. The magnetic flux leakages of a series of plate specimens with the same width, same depth and different length slot defects were tested under the same magnetizing conditions. Testing results show that defect length is an important parameter needed to consider in quantifying defects.
基金supported by Key Scientific Research Projects of Liaoning Provincial Medical Peak Construction Engineering,No.2010074
文摘A preliminary study by our research group showed that 6-mm-long regeneration chamber bridging is equivalent to autologous nerve transplantation for the repair of 12-mm nerve defects. In this study, we compared the efficacy of different lengths （6, 8, 10 mm） of nerve fragments bridging 6-mm regeneration chambers for the repair of 12-mm-long nerve defects. At 16 weeks after the regeneration chamber was implanted, the number, diameter and myelin sheath thickness of the regenerated nerve fibers, as well as the conduction velocity of the sciatic nerve and gastrocnemius muscle wet weight ratio, were similar to that observed with autologous nerve transplantation. Our results demonstrate that 6-, 8-and 10-mm-long nerve fragments bridging 6-mm regeneration chambers effectively repair 12-mm-long nerve defects. Because the chemoattractive capacity is not affected by the length of the nerve fragment, we suggest adopting 6-mm-long nerve fragments for the repair of peripheral nerve defects.
文摘针对低信噪比环境下超声细微缺陷特征提取难题,提出一种适用于低信噪比超声信号的门控残差与双级压缩-激励(squeeze and excitation,SE)注意力协同增强网络。该模型以卷积神经网络(convolutional neural network,CNN)为基础,通过残差块-SE模块-池化级联结构,在残差块内部嵌入普通SE模块进行初步通道筛选,在网络末端利用局部增强SE模块聚焦峰值信号,并采用门控残差连接从而动态保留原始细微特征,实现噪声抑制与特征增强的协同优化。结果显示:改进后模型的均方根误差(root mean square error,RMSE)均值为0.0683、平均绝对误差(mean absolute error,MAE)均值为0.0471,较基准CNN分别降低49.7%、41.7%,且模型显著优于仅使用单一注意力或残差块的改进模型,验证了双机制协同的优越性,且训练稳定性突出,低信噪比环境下仍保持高精度。所提模型的预测精度、抗干扰能力及稳定性显著优于传统方法与现有模型,为钢管超声无损检测提供高效技术方案,具有重要工业应用价值。
文摘A statistical distribution function of the dislocation link length,in unit volume of the crystalline materials has been derived theoretically after semi-infinite normalization by as- suming the distribution of actual links in all positions of crystalline materials with equal prob- ability,i.e. (l)dl=2ρl_γ^(-4)l^2exp(l^2/l_γ~2)dl where ρ is dislocation density,This assumption seems to be reasonable for polycrystalline fec metallic materials,and confirmation has been found in pure Ni and stainless steel 1Cr18Ni9Ti TEM experiments alresults.
