Metal-semiconductor Janus nanostructures with asymmetry and directionality have recently aroused significant interest,both in fundamental light-matter interactions mechanism and in technological applications.Here we r...Metal-semiconductor Janus nanostructures with asymmetry and directionality have recently aroused significant interest,both in fundamental light-matter interactions mechanism and in technological applications.Here we report the synthesis of different Au-ZnO Janus nanostructures via a facile one-pot colloid method.The growth mechanism is revealed by a series of designed synthesis experiments.The light absorption properties are determined by both the decrease of dipole oscillations of the free electrons and the plasmon-induced hot-electron transfer.Moreover,the finite-difference time-domain(FDTD)simulation method is used to elucidate the electric field distributions of these Janus nanostructures.展开更多
Ultrasound is a low-cost,non-invasive and real-time imaging modality that has proved popular for many medical applications.Unfortunately,the acquired ultrasound images are often corrupted by speckle noise from scatter...Ultrasound is a low-cost,non-invasive and real-time imaging modality that has proved popular for many medical applications.Unfortunately,the acquired ultrasound images are often corrupted by speckle noise from scatterers smaller than ultrasound beam wavelength.The signal-dependent speckle noise makes visual observation difficult.In this paper,we propose a patch-based low-rank approach for reducing the speckle noise in ultrasound images.After constructing the patch group of the ultrasound images by the block-matching scheme,we establish a variational model using the weighted nuclear norm as a regularizer for the patch group.The alternating direction method of multipliers(ADMM)is applied for solving the established nonconvex model.We return all the approximate patches to their original locations and get the final restored ultrasound images.Experimental results are given to demonstrate that the proposed method outperforms some existing state-of-the-art methods in terms of visual quality and quantitative measures.展开更多
为更好地了解新型冠状病毒肺炎研究现状与全球合作关系,利用社会网络分析和文献计量学方法,基于Web of Science数据库收录的相关文献,对期刊共引、国家与机构合作网络以及热点共现网络等进行可视化分析,从而探究相关学术研究的现状与特...为更好地了解新型冠状病毒肺炎研究现状与全球合作关系,利用社会网络分析和文献计量学方法,基于Web of Science数据库收录的相关文献,对期刊共引、国家与机构合作网络以及热点共现网络等进行可视化分析,从而探究相关学术研究的现状与特点。研究表明,中国的机构文献产出较多,但从网络角度分析节点性质后发现,英国等欧洲国家及美国的机构/学校等在网络中拥有更高的接近中心性或中介中心性。此外,新型冠状病毒肺炎研究除了在医学领域成为热点,已经扩散到神经学、公众健康等其他学科领域。本研究旨在为科研工作者和政策制定者客观掌握疫情发展趋势、开展合作研究,以及为各国探索全球公共卫生领域合作路径及应对重大疫情和公共卫生治理方案等提供参考。展开更多
目的建立硝酸咪康唑、酮康唑、曲安奈德益康唑3种咪唑类抗真菌乳膏剂的微生物限度检查方法。方法采用含5%聚山梨酯80的p H 7.0无菌氯化钠蛋白胨缓冲液制备3种乳膏剂1∶10供试液,并稀释至1∶20和1∶50,分别加入金黄色葡萄球菌、铜绿假单...目的建立硝酸咪康唑、酮康唑、曲安奈德益康唑3种咪唑类抗真菌乳膏剂的微生物限度检查方法。方法采用含5%聚山梨酯80的p H 7.0无菌氯化钠蛋白胨缓冲液制备3种乳膏剂1∶10供试液,并稀释至1∶20和1∶50,分别加入金黄色葡萄球菌、铜绿假单胞菌、枯草芽孢杆菌、白色念珠菌、黑曲霉接种无菌平皿中,按照《中国药典》2015年版四部1105考察平皿法及稀释-平皿法计数方法适用性;分别取3种乳膏剂加入无菌p H 7.0无菌氯化钠蛋白胨缓冲液和十四烷酸异丙酯两相系统中萃取,取萃取后的下层水相的上清液薄膜过滤处理后,分别加入5种试验菌,进行萃取-薄膜过滤法计数法适用性试验;分别取未经萃取-薄膜过滤处理和经过萃取-薄膜过滤的1∶10供试液,接种至不同体积的胰酪大豆胨液体培养基中,按照《中国药典》2015年版四部1106进行控制菌检查适用性试验。结果通过平皿法或稀释处理,3种乳膏剂的3种细菌类试验菌回收率即符合要求;3种乳膏剂对白色念珠菌、黑曲霉均有较强的抑菌作用,无论是平皿法还是稀释处理后的平皿法,2种试验菌回收率均远小于0.5,不符合方法适用性要求。萃取-薄膜过滤法可有效去除3种咪唑类抗真菌乳膏剂对各试验菌的抑菌作用,3种乳膏剂的试验菌回收率均在0.5~2.0,符合计数方法适用性要求。经过萃取-薄膜过滤处理的供试液控制菌检出优于未经处理的供试液。结论采用萃取-薄膜过滤法可解决样品抑菌性的去除和滤膜堵塞的问题,适用于3种咪唑类抗真菌类乳膏剂的微生物限度检查。展开更多
基金Project supported by the National Natural Science Foundation of China(Grant Nos.11274370 and 51471185)the National Key Research and Development Program of China(Grant Nos.2016YFJC020013 and 2018FYA0305800)
文摘Metal-semiconductor Janus nanostructures with asymmetry and directionality have recently aroused significant interest,both in fundamental light-matter interactions mechanism and in technological applications.Here we report the synthesis of different Au-ZnO Janus nanostructures via a facile one-pot colloid method.The growth mechanism is revealed by a series of designed synthesis experiments.The light absorption properties are determined by both the decrease of dipole oscillations of the free electrons and the plasmon-induced hot-electron transfer.Moreover,the finite-difference time-domain(FDTD)simulation method is used to elucidate the electric field distributions of these Janus nanostructures.
基金supported by NSF of Jiangsu Province(No.BK20181483),NSFC(Nos.11671002,11701079,61731009)the Fundamental Research Funds for the Central Universities,and Science and Technology Commission of Shanghai Municipality(Nos.19JC1420102,18dz2271000)Hai Yan project,Lianyungang 521 project and NSF of HHIT(No.Z2017004).
文摘Ultrasound is a low-cost,non-invasive and real-time imaging modality that has proved popular for many medical applications.Unfortunately,the acquired ultrasound images are often corrupted by speckle noise from scatterers smaller than ultrasound beam wavelength.The signal-dependent speckle noise makes visual observation difficult.In this paper,we propose a patch-based low-rank approach for reducing the speckle noise in ultrasound images.After constructing the patch group of the ultrasound images by the block-matching scheme,we establish a variational model using the weighted nuclear norm as a regularizer for the patch group.The alternating direction method of multipliers(ADMM)is applied for solving the established nonconvex model.We return all the approximate patches to their original locations and get the final restored ultrasound images.Experimental results are given to demonstrate that the proposed method outperforms some existing state-of-the-art methods in terms of visual quality and quantitative measures.
文摘为更好地了解新型冠状病毒肺炎研究现状与全球合作关系,利用社会网络分析和文献计量学方法,基于Web of Science数据库收录的相关文献,对期刊共引、国家与机构合作网络以及热点共现网络等进行可视化分析,从而探究相关学术研究的现状与特点。研究表明,中国的机构文献产出较多,但从网络角度分析节点性质后发现,英国等欧洲国家及美国的机构/学校等在网络中拥有更高的接近中心性或中介中心性。此外,新型冠状病毒肺炎研究除了在医学领域成为热点,已经扩散到神经学、公众健康等其他学科领域。本研究旨在为科研工作者和政策制定者客观掌握疫情发展趋势、开展合作研究,以及为各国探索全球公共卫生领域合作路径及应对重大疫情和公共卫生治理方案等提供参考。
文摘目的建立硝酸咪康唑、酮康唑、曲安奈德益康唑3种咪唑类抗真菌乳膏剂的微生物限度检查方法。方法采用含5%聚山梨酯80的p H 7.0无菌氯化钠蛋白胨缓冲液制备3种乳膏剂1∶10供试液,并稀释至1∶20和1∶50,分别加入金黄色葡萄球菌、铜绿假单胞菌、枯草芽孢杆菌、白色念珠菌、黑曲霉接种无菌平皿中,按照《中国药典》2015年版四部1105考察平皿法及稀释-平皿法计数方法适用性;分别取3种乳膏剂加入无菌p H 7.0无菌氯化钠蛋白胨缓冲液和十四烷酸异丙酯两相系统中萃取,取萃取后的下层水相的上清液薄膜过滤处理后,分别加入5种试验菌,进行萃取-薄膜过滤法计数法适用性试验;分别取未经萃取-薄膜过滤处理和经过萃取-薄膜过滤的1∶10供试液,接种至不同体积的胰酪大豆胨液体培养基中,按照《中国药典》2015年版四部1106进行控制菌检查适用性试验。结果通过平皿法或稀释处理,3种乳膏剂的3种细菌类试验菌回收率即符合要求;3种乳膏剂对白色念珠菌、黑曲霉均有较强的抑菌作用,无论是平皿法还是稀释处理后的平皿法,2种试验菌回收率均远小于0.5,不符合方法适用性要求。萃取-薄膜过滤法可有效去除3种咪唑类抗真菌乳膏剂对各试验菌的抑菌作用,3种乳膏剂的试验菌回收率均在0.5~2.0,符合计数方法适用性要求。经过萃取-薄膜过滤处理的供试液控制菌检出优于未经处理的供试液。结论采用萃取-薄膜过滤法可解决样品抑菌性的去除和滤膜堵塞的问题,适用于3种咪唑类抗真菌类乳膏剂的微生物限度检查。
