Aiming at the problems of high complexity and low accuracy of existing visibility detection methods,a road visibility detection method based on monitoring images is proposed.Firstly,the transmittance of dark and brigh...Aiming at the problems of high complexity and low accuracy of existing visibility detection methods,a road visibility detection method based on monitoring images is proposed.Firstly,the transmittance of dark and bright primary colors is obtained by the theory of dark and bright primary color prior.Then,the atmospheric light value and atmospheric transmittance are optimized by using adaptive fog removal weight and adaptive filtering window,and the transmittance of the first and last end points of the lane line is one-toone corresponding to the optimized dark and bright primary transmittance.Finally,the atmospheric extinction coefficient and visibility are calculated by combining the distance between the end and end of the lane line.The experimental results show that this method can achieve high precision detection within 100-600m,and the relative error is less than 10%.Compared with other methods,the detection efficiency of this method is faster,the accuracy is higher and the realization is easier.展开更多
In the present study,we developed a novel colorimetric strategy for the visible rapid detection of the influenza virus based on the unique optical properties of gold nanorods.Specifically,lipoic acid-modified Oseltami...In the present study,we developed a novel colorimetric strategy for the visible rapid detection of the influenza virus based on the unique optical properties of gold nanorods.Specifically,lipoic acid-modified Oseltamivir(OS),which is a strong neuraminidase inhibitor and used as the first-line drug in the treatment of influenza,was synthesized and further attached to the surface of gold nanorods(OS-LA-GNRs).The absorption band and density of OS-LA-GNRs were changed with the decreasing distance between the nanoparticles induced by the target-specific aggregation via strong neuraminidase–OS binding.All of these could be visible with the naked eyes and measured by UV-visible spectrophotometry.The results showed that our system had a comparable limit of detection(LOD)to the commercial colloidal gold stripes,making it feasible for wide diagnostic applications.展开更多
Tunneling heterostructures are emerging as a versatile architecture for photodetection due to their advanced optical sensitivity,tailorable detection band,and wellbalanced photoelectric performances.However,the existi...Tunneling heterostructures are emerging as a versatile architecture for photodetection due to their advanced optical sensitivity,tailorable detection band,and wellbalanced photoelectric performances.However,the existing tunneling heterostructures are mainly operated in the visible wavelengths and have been rarely investigated for the nearinfrared detection.Herein,we report the design and realization of a novel broken-gap tunneling heterostructure by combining WSe2 and Bi2Se3,which is able to realize the simultaneous visible and near-infrared detection because of the complementary bandgaps of WSe2 and Bi2Se3(1.46 and 0.3 e V respectively).Thanks to the realigned band structure,the heterostructure shows an ultralow dark current below picoampere and a high tunneling-dominated photocurrent.The photodetector based on our tunneling heterostructure exhibits a superior specific detectivity of 7.9×1012Jones for a visible incident of 532 nm and 2.2×1010Jones for a 1456 nm nearinfrared illumination.Our study demonstrates a new band structure engineering avenue for the construction of van der Waals tunneling heterostructures for high-performance wide band photodetection.展开更多
文摘Aiming at the problems of high complexity and low accuracy of existing visibility detection methods,a road visibility detection method based on monitoring images is proposed.Firstly,the transmittance of dark and bright primary colors is obtained by the theory of dark and bright primary color prior.Then,the atmospheric light value and atmospheric transmittance are optimized by using adaptive fog removal weight and adaptive filtering window,and the transmittance of the first and last end points of the lane line is one-toone corresponding to the optimized dark and bright primary transmittance.Finally,the atmospheric extinction coefficient and visibility are calculated by combining the distance between the end and end of the lane line.The experimental results show that this method can achieve high precision detection within 100-600m,and the relative error is less than 10%.Compared with other methods,the detection efficiency of this method is faster,the accuracy is higher and the realization is easier.
基金Natural Science Foundation of China(Grant No.81773583)Tackling Key Research Project for New Corona Virus Prevention and Treatment of Tianjin University of Science&Technology(Grant No.2020STCV0019)。
文摘In the present study,we developed a novel colorimetric strategy for the visible rapid detection of the influenza virus based on the unique optical properties of gold nanorods.Specifically,lipoic acid-modified Oseltamivir(OS),which is a strong neuraminidase inhibitor and used as the first-line drug in the treatment of influenza,was synthesized and further attached to the surface of gold nanorods(OS-LA-GNRs).The absorption band and density of OS-LA-GNRs were changed with the decreasing distance between the nanoparticles induced by the target-specific aggregation via strong neuraminidase–OS binding.All of these could be visible with the naked eyes and measured by UV-visible spectrophotometry.The results showed that our system had a comparable limit of detection(LOD)to the commercial colloidal gold stripes,making it feasible for wide diagnostic applications.
基金supported by the National Nature Science Foundation of China(21825103 and 51727809)Hubei Provincial Natural Science Foundation of China(2019CFA002)the Fundamental Research Funds for the Central Universities(2019kfyXMBZ018)。
文摘Tunneling heterostructures are emerging as a versatile architecture for photodetection due to their advanced optical sensitivity,tailorable detection band,and wellbalanced photoelectric performances.However,the existing tunneling heterostructures are mainly operated in the visible wavelengths and have been rarely investigated for the nearinfrared detection.Herein,we report the design and realization of a novel broken-gap tunneling heterostructure by combining WSe2 and Bi2Se3,which is able to realize the simultaneous visible and near-infrared detection because of the complementary bandgaps of WSe2 and Bi2Se3(1.46 and 0.3 e V respectively).Thanks to the realigned band structure,the heterostructure shows an ultralow dark current below picoampere and a high tunneling-dominated photocurrent.The photodetector based on our tunneling heterostructure exhibits a superior specific detectivity of 7.9×1012Jones for a visible incident of 532 nm and 2.2×1010Jones for a 1456 nm nearinfrared illumination.Our study demonstrates a new band structure engineering avenue for the construction of van der Waals tunneling heterostructures for high-performance wide band photodetection.
