针对壁画数目较少会导致深度学习模型训练不够充分的问题,提出了一种结合深层迁移模型和底层简单视觉相结合的古代壁画分类模型。模型将Visual Geometry Group Network迁移模型学习到的知识应用到目标小样本集上进行微调得到壁画高层特...针对壁画数目较少会导致深度学习模型训练不够充分的问题,提出了一种结合深层迁移模型和底层简单视觉相结合的古代壁画分类模型。模型将Visual Geometry Group Network迁移模型学习到的知识应用到目标小样本集上进行微调得到壁画高层特征,结合颜色直方图和局部二值模式纹理算子为特征描述子进行分类。实验结果表明:在构建的壁画图像数据集上,模型达到了90.35%的准确率。与传统模型和其他的卷积神经网络相比,算法在分类准确率、泛化能力和稳定性上都有很大提升,验证了模型对于壁画分类的有效性。展开更多
Scanning tunneling spectroscopy of metal phthalocyanines(MPc)adsorbed on a Au(111)surface with a Ni(111)scanning tunneling microscopy tip is simulated on the basis of first-principles calculations and a modified Barde...Scanning tunneling spectroscopy of metal phthalocyanines(MPc)adsorbed on a Au(111)surface with a Ni(111)scanning tunneling microscopy tip is simulated on the basis of first-principles calculations and a modified Bardeen approximation.Local d orbital symmetry matching between the molecule and the Ni tip brings obvious negative differential resistance(NDR)phenomena,of which,bias voltage and resonant orbitals can be tuned sensitively by the central ion of the molecule.Different dependences of the NDR peak on the tip−molecule distance at two bias polarities and rectifying phenomena are also interpreted in terms of specific structures of 3d orbitals of the adsorbed MPc and Ni tip.展开更多
目的:分析佳木斯市区高中新生中结核分枝杆菌潜伏感染筛查结果及其防治对策,为学校制定新生结核病管理工作提供参考。方法:收集市区内8所高中新生的结核菌素纯蛋白衍生物(tuberculin-purified protein derivative,TB-PPD)检测结果,分析...目的:分析佳木斯市区高中新生中结核分枝杆菌潜伏感染筛查结果及其防治对策,为学校制定新生结核病管理工作提供参考。方法:收集市区内8所高中新生的结核菌素纯蛋白衍生物(tuberculin-purified protein derivative,TB-PPD)检测结果,分析和比较普通高中与职业高中新生强阳性、中度阳性和一般阳性发生率的差异。结果:8所高中新生中,3 563人学生经TB-PPD筛查阴性率仅为46.65%、一般阳性率为29.41%、中度阳性率为18.72%,强阳性率为5.22%;女生中强阳性率高于男生(χ^(2)=4.658,P<0.05),<15岁年龄组学生的强阳性率高于≥15岁年龄组,(χ^(2)=4.156,P<0.05)。结论:新生入学结核病筛查是控制学校结核病疫情的重要手段,学校应建立新生入学结核病筛查的长效机制;对TB-PPD筛查的强阳性者应进行健康宣教、预防性服药、后续的监测管理工作,从而降低学生结核病的患病率。展开更多
基金This work was supported by the National Basic Research Program of China （No.2011CB921400）, the Strategic Priority Research Program （B） of the Chinese Academy of Sciences （No.XDB01020100）, the Key Research Program of the Chinese Academy of Sciences （No.KJCX2-EWJ02）, the Youth Innovation Promotion Association of the Chinese Academy of Sciences （No.2011322）, and the National Natural Science Foundation of China （No.21473174, No.21273210, and No.51132007）.
基金This work was supported by the National Natural Science Foundation of China （No.91321309, No.91421313, No.21421063, and No.21273210）, the ＂Strategic Priority Research Program＂ of the Chinese Academy of Sciences （No.XDB01020100）, and the Fundamental Research Funds for the Central Universities （No.2340000050 and No.2340000074）.
文摘针对壁画数目较少会导致深度学习模型训练不够充分的问题,提出了一种结合深层迁移模型和底层简单视觉相结合的古代壁画分类模型。模型将Visual Geometry Group Network迁移模型学习到的知识应用到目标小样本集上进行微调得到壁画高层特征,结合颜色直方图和局部二值模式纹理算子为特征描述子进行分类。实验结果表明:在构建的壁画图像数据集上,模型达到了90.35%的准确率。与传统模型和其他的卷积神经网络相比,算法在分类准确率、泛化能力和稳定性上都有很大提升,验证了模型对于壁画分类的有效性。
基金by the National Natural Science Foundation of China under Grant Nos 90921013,10704069,20703041 and 20933006the Fundamental Research Funds for the Central Universities。
文摘Scanning tunneling spectroscopy of metal phthalocyanines(MPc)adsorbed on a Au(111)surface with a Ni(111)scanning tunneling microscopy tip is simulated on the basis of first-principles calculations and a modified Bardeen approximation.Local d orbital symmetry matching between the molecule and the Ni tip brings obvious negative differential resistance(NDR)phenomena,of which,bias voltage and resonant orbitals can be tuned sensitively by the central ion of the molecule.Different dependences of the NDR peak on the tip−molecule distance at two bias polarities and rectifying phenomena are also interpreted in terms of specific structures of 3d orbitals of the adsorbed MPc and Ni tip.
文摘目的:分析佳木斯市区高中新生中结核分枝杆菌潜伏感染筛查结果及其防治对策,为学校制定新生结核病管理工作提供参考。方法:收集市区内8所高中新生的结核菌素纯蛋白衍生物(tuberculin-purified protein derivative,TB-PPD)检测结果,分析和比较普通高中与职业高中新生强阳性、中度阳性和一般阳性发生率的差异。结果:8所高中新生中,3 563人学生经TB-PPD筛查阴性率仅为46.65%、一般阳性率为29.41%、中度阳性率为18.72%,强阳性率为5.22%;女生中强阳性率高于男生(χ^(2)=4.658,P<0.05),<15岁年龄组学生的强阳性率高于≥15岁年龄组,(χ^(2)=4.156,P<0.05)。结论:新生入学结核病筛查是控制学校结核病疫情的重要手段,学校应建立新生入学结核病筛查的长效机制;对TB-PPD筛查的强阳性者应进行健康宣教、预防性服药、后续的监测管理工作,从而降低学生结核病的患病率。
