New stared compounds including norfloxacin fragments were prepared via a multi-step route,which were employed as the target corrosion inhibitors(TCIs)for mild steel in 1 mol/L HCl solution.For comparisons,the linear c...New stared compounds including norfloxacin fragments were prepared via a multi-step route,which were employed as the target corrosion inhibitors(TCIs)for mild steel in 1 mol/L HCl solution.For comparisons,the linear compounds including a single norfloxacin part employed as the reference corrosion inhibitors(RCIs)were synthesized.The molecular structures of the stared compounds were confirmed.The material simulation calculations suggest the presence of large binding energies of the stared compounds on mild steel surface.The enhanced chemisorption of the stared compounds on mild steel surface was demonstrated,which could be resulted by the chemical complexion of the target stared molecules with iron atoms.The reinforced adsorption of the target compounds on mild steel surface was investigated by atomic force microscopy(AFM)and scanning electron microscopy(SEM).The electrochemical analyses reveal the super protection of the TCIs for mild steel in HCl solution,and the anticorrosion efficiency reaches 96.45%(TCI1,0.050 mM)and 96.61%(TCI2,0.010 mM)at 298 K.展开更多
目的探讨以阴性症状为主(predominant negative symptoms,PNS)精神分裂症患者的纹状体静息态功能连接(resting-state functional connectivity,rsFC)改变及与阴性症状的关系。方法54例PNS精神分裂症患者和61例健康对照接受静息态功能磁...目的探讨以阴性症状为主(predominant negative symptoms,PNS)精神分裂症患者的纹状体静息态功能连接(resting-state functional connectivity,rsFC)改变及与阴性症状的关系。方法54例PNS精神分裂症患者和61例健康对照接受静息态功能磁共振扫描,完成一般资料收集及阳性与阴性症状量表(Positive and Negative Syndrome Scale,PANSS)、阴性症状量表(Scale for the Assessment of Negative Symptoms,SANS)、时间性愉快体验量表(Temporal Experience of Pleasure Scale,TEPS)评定。选择12个纹状体亚区为感兴趣区(regions of interest,ROIs),分析各ROI与全脑体素的rsFC,并提取差异脑区的rsFC值与阴性症状行Pearson相关分析。结果与健康对照相比,PNS精神分裂症患者右背尾壳核与右脑岛、左额中回(middle frontal gyrus,MFG)、右内侧和旁扣带回(median cingulate and paracingulate gyri,MCC)之间,左背尾壳核与右壳核、左脑岛、左MFG之间,右背喙壳核与双侧MFG、左脑岛、右MCC之间,左背喙壳核与右脑岛、左中央沟盖之间,右腹喙壳核与双侧壳核、左MFG、右MCC之间,左腹喙壳核与右脑岛、左壳核、双侧MFG、右MCC、左顶下缘角回之间,及左腹侧尾状核下部/伏隔核与右脑岛、左前扣带回(胼胝体上部)、双侧楔前叶之间的rsFC降低(体素水平P<0.001未校正,簇水平FWE校正,P_(FWE)<0.05/12=0.004)。未发现PNS精神分裂症患者较健康对照rsFC增强的脑区,也未发现与SANS、TEPS量表相关的rsFC(P_(Bonferroni)>0.05)。结论PNS精神分裂症患者存在广泛的皮层-纹状体功能连接异常,主要是壳核与MFG、MCC、岛叶之间rsFC异常降低。展开更多
利用高分辨率地球同步轨道卫星对海洋区域重复观测的特点,本文提出一种舰船运动目标检测算法,通过快速区域提取算法,提取云掩膜与水体的NDWI(Normalized Difference Water Index),基于梯度算法对海洋背景进行建模,随后使用深度学习的方...利用高分辨率地球同步轨道卫星对海洋区域重复观测的特点,本文提出一种舰船运动目标检测算法,通过快速区域提取算法,提取云掩膜与水体的NDWI(Normalized Difference Water Index),基于梯度算法对海洋背景进行建模,随后使用深度学习的方法,将多尺度特征融合目标检测技术与基于上下文分析的模型相结合,得到时序影像中舰船目标位置信息。本研究同时利用真实目标和仿真目标相结合的技术,验证了算法的可行性。在50m分辨率的高分四序列影像实验中表明,本研究提出的算法可以有效提取多尺度运动舰船目标的位置和状态信息,有效为舰船目标检测和跟踪领域提供技术支撑。该算法在工程实践领域中具有较高的应用价值。展开更多
基金Funded by the National Natural Science Foundation of China(NSFC)of China(No.21878029)the Chongqing Science and Technology Commission(Nos.2022NSCQ-MSX1298 and CSTB2023NSCQ-MSX0345)。
文摘New stared compounds including norfloxacin fragments were prepared via a multi-step route,which were employed as the target corrosion inhibitors(TCIs)for mild steel in 1 mol/L HCl solution.For comparisons,the linear compounds including a single norfloxacin part employed as the reference corrosion inhibitors(RCIs)were synthesized.The molecular structures of the stared compounds were confirmed.The material simulation calculations suggest the presence of large binding energies of the stared compounds on mild steel surface.The enhanced chemisorption of the stared compounds on mild steel surface was demonstrated,which could be resulted by the chemical complexion of the target stared molecules with iron atoms.The reinforced adsorption of the target compounds on mild steel surface was investigated by atomic force microscopy(AFM)and scanning electron microscopy(SEM).The electrochemical analyses reveal the super protection of the TCIs for mild steel in HCl solution,and the anticorrosion efficiency reaches 96.45%(TCI1,0.050 mM)and 96.61%(TCI2,0.010 mM)at 298 K.
文摘目的探讨以阴性症状为主(predominant negative symptoms,PNS)精神分裂症患者的纹状体静息态功能连接(resting-state functional connectivity,rsFC)改变及与阴性症状的关系。方法54例PNS精神分裂症患者和61例健康对照接受静息态功能磁共振扫描,完成一般资料收集及阳性与阴性症状量表(Positive and Negative Syndrome Scale,PANSS)、阴性症状量表(Scale for the Assessment of Negative Symptoms,SANS)、时间性愉快体验量表(Temporal Experience of Pleasure Scale,TEPS)评定。选择12个纹状体亚区为感兴趣区(regions of interest,ROIs),分析各ROI与全脑体素的rsFC,并提取差异脑区的rsFC值与阴性症状行Pearson相关分析。结果与健康对照相比,PNS精神分裂症患者右背尾壳核与右脑岛、左额中回(middle frontal gyrus,MFG)、右内侧和旁扣带回(median cingulate and paracingulate gyri,MCC)之间,左背尾壳核与右壳核、左脑岛、左MFG之间,右背喙壳核与双侧MFG、左脑岛、右MCC之间,左背喙壳核与右脑岛、左中央沟盖之间,右腹喙壳核与双侧壳核、左MFG、右MCC之间,左腹喙壳核与右脑岛、左壳核、双侧MFG、右MCC、左顶下缘角回之间,及左腹侧尾状核下部/伏隔核与右脑岛、左前扣带回(胼胝体上部)、双侧楔前叶之间的rsFC降低(体素水平P<0.001未校正,簇水平FWE校正,P_(FWE)<0.05/12=0.004)。未发现PNS精神分裂症患者较健康对照rsFC增强的脑区,也未发现与SANS、TEPS量表相关的rsFC(P_(Bonferroni)>0.05)。结论PNS精神分裂症患者存在广泛的皮层-纹状体功能连接异常,主要是壳核与MFG、MCC、岛叶之间rsFC异常降低。
文摘利用高分辨率地球同步轨道卫星对海洋区域重复观测的特点,本文提出一种舰船运动目标检测算法,通过快速区域提取算法,提取云掩膜与水体的NDWI(Normalized Difference Water Index),基于梯度算法对海洋背景进行建模,随后使用深度学习的方法,将多尺度特征融合目标检测技术与基于上下文分析的模型相结合,得到时序影像中舰船目标位置信息。本研究同时利用真实目标和仿真目标相结合的技术,验证了算法的可行性。在50m分辨率的高分四序列影像实验中表明,本研究提出的算法可以有效提取多尺度运动舰船目标的位置和状态信息,有效为舰船目标检测和跟踪领域提供技术支撑。该算法在工程实践领域中具有较高的应用价值。
