Zou  Rui  Huang  Junjian  Shi  Junpeng  Huang  Lin  Zhang  Xuejie  Wong  Ka-Leung  Zhang  Hongwu  Jin  Dayong  Wang  Jing  Su  Qiang 《Nano Research》2017,10(6):2070-2082

Near-infrared (NIR) persistent-luminescence nanoparticles have emerged as a new class of background-free contrast agents that are promising for in vivo imaging.The next key roadblock is to establish a robust and controllable method for synthesizing monodisperse nanoparticles with high luminescence brightness and long persistent duration.Herein,we report a synthesis strategy involving the coating/etching of the SiO2 shell to obtain a new class of small NIR highly persistent luminescent ZnGa2O4∶Cr3+,Sn4+ (ZGOCS) nanoparticles.The optimized ZGOCS nanoparticles have an excellent size distribution of ～15 nm without any agglomeration and an NIR persistent luminescence that is enhanced by a factor of 13.5,owing to the key role of the SiO2 shell in preventing nanoparticle agglomeration after annealing.The ZGOCS nanoparticles have a signal-to-noise ratio ～3 times higher than that of previously reported ZnGa2O4∶Cr3+ (ZGC-1) nanoparticles as an NIR persistent-luminescence probe for in vivo bioimaging.Moreover,the persistent-luminescence signal from the ZGOCS nanoparticles can be repeatedly re-charged in situ with external excitation by a white lightemitting diode;thus,the nanoparticles are suitable for long-term in vivo imaging applications.Our study suggests an improved strategy for fabricating novel high-performance optical nanoparticles with good biocompatibility.  相似文献   

    

Shih‐Wen Hsiao  Chih‐Huang Yen  Chu‐Hsuan Lee 《Color research and application》2017,42(6):775-787

Consumer behavior is complicated. In the cosmetic market, personal intuition and fashion trends for color selection are guidelines for consumers. A systematic method for female facial skin‐color classification and an application in the makeup market are proposed in this study. In this article, face recognition with a large number of images is first discussed. Then, an innovative method to capture color at selected points is presented and complexion‐aggregated analysis is performed. This innovative method is an extension of face‐recognition theory. Images in RGB format are converted to CIELAB format during data collection and then Fuzzy C‐means theory is used to cluster and group the data. The results are classified and grouped in Lab value and RGB index. Two programs are created. The first program, “FaceRGB,” captures color automatically from images. The second program, “ColorFCM,” clusters and groups the skin‐color information. The results can be used to assist an expert system in the selection of customized colors during makeup and new‐product development.  相似文献   

    

Junwei Chu  Fengmei Wang  Lei Yin  Le Lei  Chaoyi Yan  Feng Wang  Yao Wen  Zhenxing Wang  Chao Jiang  Liping Feng  Jie Xiong  Yanrong Li  Jun He 《Advanced functional materials》2017,27(32)

2D materials, represented by transition metal dichalcogenides (TMDs), have attracted tremendous research interests in photoelectronic and electronic devices. However, for their relatively small bandgap (<2 eV), the application of traditional TMDs into solar‐blind ultraviolet (UV) photodetection is restricted. Here, for the first time, NiPS₃ nanosheets are grown via chemical vapor deposition method. The nanosheets thinning to 3.2 nm with the lateral size of dozens of micrometers are acquired. Based on the various nanosheets, a linearity is found between the Raman intensity of specific A_g modes and the thickness, providing a convenient method to determine their layer numbers. Furthermore, a UV photodetector is fabricated using few‐layered 2D NiPS₃ nanosheets. It shows an ultrafast rise time shorter than 5 ms with an ultralow dark current less than 10 fA. Notably, this UV photodetector demonstrates a high detectivity of 1.22 × 10¹² Jones, outperforming some traditional wide‐bandgap UV detectors. The wavelength‐dependent photoresponsivity measurement allows the direct observation of an admirable cut‐off wavelength at 360 nm, which indicates a superior spectral selectivity. The promising photodetector performance, accompanied with the controllable fabrication and transfer process of nanosheet, lays the foundation of applying 2D semiconductors for ultrafast UV light detection.  相似文献   

    

Zhanguo Zhu  Feifeng Zheng  Chengbin Chu 《国际生产研究杂志》2017,55(1):296-312

Motivated by the behavioral phenomena that occur while human operators are carrying out tasks, we study multitasking scheduling problems with a rate-modifying activity. In the problems, the processing of a selected task suffers from interruptions by other tasks that are available but unfinished, and the human operators regularly engage rest breaks during work shifts allowing them to recover or mitigate some of the negative effects of fatigue. The objectives are to respectively minimize: makespan, total completion time, maximum lateness, and due-date assignment related cost by determining when to schedule the rate modifying activity and the optimal task sequence in the presence of multitasking. Scheduling models and algorithms are proposed to solve the problems. The numerical examples are presented to illustrate the theorems and algorithms.  相似文献   

    

Mengnan Guo  Shiyu Liu  Manman Wang  Yifei Lv  Jialei Shi  Yuan Zeng  Jiannong Ye  Qingcui Chu 《Journal of the science of food and agriculture》2020,100(1):301-307

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Yusong Sheng  Wenxian Ji  Yanmeng Chu  Yue Ming  Anyi Mei  Yue Hu  Yaoguang Rong  Hongwei Han 《Solar RRL》2020,4(9)

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Lei Zhang  Haitao Zhang  Xiang Chu  Fangyan Liu  Chunsheng Guo  Weiqing Yang 《ENERGY & ENVIRONMENTAL MATERIALS》2020,3(3):421-428

Although the synthesis of novel nanostructured metal sulfides has been well established, further size‐controllable optimization is still valuable to enhance their performance for various applications. Herein, a self‐template method to size‐controllably synthesize the hollow NiCo₂S₄ nanospheres is reported. Uniformly monodisperse NiCo precursors with diameter widely ranging from 97 to 550 nm are controllably synthesized and subsequently transformed into hollow NiCo₂S₄ nanospheres through in situ sulfidation. Smaller nanoparticles' diameter results in the hollow NiCo₂S₄ nanospheres larger surface area and thinner shell thickness and hence provides much more electrochemical active sites as well as facilitate the ion and electron transfer. Consequently, the hollow NiCo₂S₄ nanospheres—used as the electrode materials in supercapacitors—achieve 19% enhancement of specific capacity from 484.8 to 575.1 C g⁻¹ through lowering the 42.5% diameter of hollow NiCo₂S₄ nanospheres from 407 to 234 nm. Moreover, the hollow NiCo₂S₄ nanospheres with 234 nm diameter exhibit superior rate capacity indicated by 49% capacity retention from 1 to 50 A g⁻¹ and excellent cycling stability (77% after 2000 cycles). Furthermore, this method is a potentially general strategy in the size‐controllable synthesis of the metal sulfides hollow nanostructures and results in the remarkable electrochemical applications.  相似文献   

Isobavachalcone ameliorates diabetic nephropathy in rats by inhibiting the NF-κB pathway     

Wen-hong Dong  Qiang-qiang Chu  Shang-quan Liu  Da-tong Deng  Qian Xu 《Journal of Food Biochemistry》2020,44(9):e13405

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Yi Gan  Hong Chen  Xian-Rong Zhou  Ling-Ling Chu  Wan-Ting Ran  Fang Tan  Xin Zhao 《Journal of Food Biochemistry》2020,44(11):e13495

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Xiangxiang Bao  Junjian Miao  Yuxia Fan  Keqiang Lai 《Journal of Food Processing and Preservation》2020,44(5):e14435

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