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Infrared small target detection based on modified local entropy and EMD

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Chinese Optics Letters 2010年第1期8卷 24-28页

作者：邓鹤刘建国陈忠 institute for Pattern Recognition and Artificial Intelligence Huazhong University of Science and Technology

Image entropy and empirical mode decomposition （EMD） are effective methods for target detection. EMD algorithm is a powerful tool for adaptive multiscale analysis of nonstationary signals. A new technique based on EMD and modified local entropy is proposed in small target detection under sea-sky background. With the EMD algorithm, it is valid to estimate the background and get the target image by removing the background from the original image and segmenting the target based on the modified local entropy method. The data analysis and experiments show the validity of the proposed algorithm.

关键词： Algorithms Entropy Target drones

Manipulation of High-Fidelity Sidebands under Large Detuning by Floquet technology:Application to Multi-Mode Cooling

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Chinese Physics Letters 2024年第11期41卷 53-61页

作者： Xue-Ying Yang Zi-Dong Lin Shu-Ying Mu Wei Wu Chun-Wang Wu Yi Xie Ping-Xing Chen institute for Quantum science and technology College of SciencesNational University of Defense TechnologyChangsha 410073China shenzhen institute for Quantum science and Engineering and Department of Physics Southern University of Science and TechnologyShenzhen 518055China

The Floquet technology,a powerful way to manipulate quantum states,is employed to drive sidebands transition under large *** results demonstrate that high fidelities over 99%can be achieved through optimizing suitable modulation frequencies under large *** observe high-fidelity transitions within a high bandwidth by utilizing a single modulation frequency and reveal that this capability is due to the emergence of a flat-band structure in the bandwidth *** key finding of high-fidelity sideband manipulation under large detuning is experimentally confirmed in nuclear magnetic resonance ***,we propose a new parallel sideband cooling scheme that enables simultaneous cooling of multiple motional *** approach improves the cooling rate compared to conventional schemes with fixed laser frequency and power,and eliminates the need for mode-specific *** Floquet parallel scheme is applicable to any harmonic oscillator system and is not limited by bandwidth in theory.

关键词： tuning bands scheme

Indirect building localization based on a prominent solid landmark from a forward-looking infrared imagery

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Chinese Optics Letters 2011年第4期9卷 34-37页

作者：汪小平张天序杨效余 institute for Pattern Recognition and Artificial Intelligence Huazhong University of Science and Technology

A novel indirect building localization technique based on a prominent solid landmark from a forward- looking infrared imagery is proposed to localize low, deeply buried, or carefully camouflaged buildings in dense urban areas. First, the widely used effective methods are applied to detect and localize the solid landmark. The building target is then precisely indirectly localized by perspective transformation according to the imaging parameters and the space constraint relations between the building target and the solid landmark. Experimental results demonstrate this technique can indirectly localize buildings in dense urban areas effectively.

关键词： mode DOM

BUDGET CONSTRAINTS IN HOMOGENOUS MULTI-UNIT AUCTIONS

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Journal of Systems science & Complexity 2012年第3期25卷 549-555页

作者： Yaqiong WU Yong ZHAO Chaoyuan YUE Xianglin WU College of Information science and technology Beijing University of Chemical Technology institute of Systems Engineering Department of Control Science and EngineeringHuazhong University of Science and Technology

A homogenous multi-unit auction model is studied in two conditions： One is that the bidders face budget constraints and another is that the bidders do not face budget constraints. Two equilibrium bidding strategies of each bidder are presented in these two conditions. By comparing them, the authors show that the equilibrium unit price bid in the presence of budget constraints will be less than that in the absence of budget constraints. The difference between the two equilibrium bids leads to the reduced revenue of the seller. And this difference will decrease as the number of the bidders increases.

关键词： Auctions/bidding budget constraints equilibrium bidding strategy homogenous multi-unit.

Quantum supremacy: some fundamental concepts

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National science Review 2019年第1期6卷 22-23页

作者： Man-Hong Yung shenzhen institute for Quantum science and Engineering and Department of Physics Southern University of Science and Technology shenzhen Key Laboratory of Quantum science and Engineering Southern University of Science and Technology

Quantum computation was envisioned by Feynman as a valuable means of solving quantum problems [1]. The question is, how do we prove the superiority of quantum computing over classical devices? A common misconception in describing the power of a quantum computer over a classical computer is that quantum bits can be prepared in a superposition of an exponential number of states, which cannot be achieved with classical bits. This statement is certainly true, but it does not tell us, specifically,what problems quantum computers can

关键词： Quantum supremacy some fundamental concepts

Multilevel carbon architecture of subnanoscopic silicon for fast‐charging high‐energy‐density lithium‐ion batteries

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Carbon Energy 2024年第4期6卷 256-268页

作者： Meisheng Han Yongbiao Mu Lei Wei Lin Zeng Tianshou Zhao shenzhen Key Laboratory of Advanced Energy Storage Southern University of Science and TechnologyShenzhenChina SUSTech Energy institute for Carbon Neutrality Southern University of Science and TechnologyShenzhenChina Department of Mechanical and Energy Engineering Southern University of Science and TechnologyShenzhenChina

Silicon(Si)is widely used as a lithium‐ion‐battery anode owing to its high capacity and abundant crustal ***,large volume change upon cycling and poor conductivity of Si cause rapid capacity decay and poor fast‐charging capability limiting its commercial ***,we propose a multilevel carbon architecture with vertical graphene sheets(VGSs)grown on surfaces of subnanoscopically and homogeneously dispersed Si–C composite nanospheres,which are subsequently embedded into a carbon matrix(C/VGSs@Si–C).Subnanoscopic C in the Si–C nanospheres,VGSs,and carbon matrix form a three‐dimensional conductive and robust network,which significantly improves the conductivity and suppresses the volume expansion of Si,thereby boosting charge transport and improving electrode *** VGSs with vast exposed edges considerably increase the contact area with the carbon matrix and supply directional transport channels through the entire material,which boosts charge *** carbon matrix encapsulates VGSs@Si–C to decrease the specific surface area and increase tap density,thus yielding high first Coulombic efficiency and electrode compaction ***,C/VGSs@Si–C delivers excellent Li‐ion storage performances under industrial electrode *** particular,the full cells show high energy densities of 603.5 Wh kg^(−1)and 1685.5 Wh L^(−1)at 0.1 C and maintain 80.7%of the energy density at 3 C.

关键词： fast charging high energy densities lithium‐ion batteries multilevel carbon architecture subnanoscopic silicon anode

An Experimental Study on Oxidized Mercury Adsorption by Bromide Blended Coal Combustion Fly Ash

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Energy Engineering 2021年第5期118卷 1277-1286页

作者： Mingyu Yu Mengyuan Liu Guangqian Luo Ruize Sun Jingyuan Hu Hailu Zhu Li Zhong Lipeng Han Xian Li Hong Yao State Key Laboratory of Coal Combustion School of Energy and Power EngineeringHuazhong University of Science and TechnologyWuhan430074China shenzhen huazhong university of science and technology Research institute Shenzhen518000China Huaneng Clean Energy technology Research institute Beijing102209China

The application of forced mercury oxidation technology would lead to an increase of Hg^(2+)concentration in the flue *** Hg^(2+)can be easily removed in the WFGD,the mercury re-emission in the WFGD can decrease the total removal of mercury from coal-fired power ***,it is necessary to control Hg^(2+)concentration in the devices before the *** ash adsorbent is considered as a potential alternative for commercial activated carbon ***,the adsorption efficiency of the original fly ash is *** procedure is needed to enhance the adsorption *** this study,the adsorption of Hg^(2+)by brominated fly ash was *** fly ash was collected from the full-scale power plant utilizing bromide-blended coal combustion *** brominated fly ash exhibited excellent performance for Hg^(2+)*** flue gas component HBr and SO_(2)could improve adsorbent’s performance,while HCl would hinder its adsorption ***,it was demonstrated by Hg-TPD experiments that the adsorbed Hg^(2+)mainly existed on the fly ash surface in the form of HgBr_(2).In summary,the brominated fly ash has a broad application prospect for mercury control.

关键词： Mercury fly ash bromide adsorbents flue gas

3D micropattern force triggers YAP nuclear entry by transport across nuclear pores and modulates stem cells paracrine

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National science Review 2023年第8期10卷 180-193页

作者： Yan Li Zhenyu Zhong Cunjing Xu Xiaodan Wu Jiaqi Li Weiyong Tao Jianglin Wang Yingying Du Shengmin Zhang Advanced Biomaterials and Tissue Engineering Center Huazhong University of Science and Technology Department of Biomedical Engineering Huazhong University of Science and Technology Research Base of Regulatory science for Medical Devices National Medical Products Administration&Institute of Regulatory Science for Medical Devices Huazhong University of Science and Technology

Biophysical cues of the cellular microenvironment tremendously influence cell behavior by mechanotransduction. However, it is still unclear how cells sense and transduce the mechanical signals from 3D geometry to regulate cell function. Here, the mechanotransduction of human mesenchymal stem cells(MSCs) triggered by 3D micropatterns and its effect on the paracrine of MSCs are systematically investigated. Our findings show that 3D micropattern force could influence the spatial reorganization of the cytoskeleton, leading to different local forces which mediate nucleus alteration such as orientation,morphology, expression of Lamin A/C and chromatin condensation. Specifically, in the triangular prism and cuboid micropatterns, the ordered F-actin fibers are distributed over and fully transmit compressive forces to the nucleus, which results in nuclear flattening and stretching of nuclear pores, thus enhancing the nuclear import of YES-associated protein(YAP). Furthermore, the activation of YAP significantly enhances the paracrine of MSCs and upregulates the secretion of angiogenic growth factors. In contrast, the fewer compressive forces on the nucleus in cylinder and cube micropatterns cause less YAP entering the *** skin repair experiment provides the first in vivo evidence that enhanced MSCs paracrine by 3D geometry significantly promotes tissue regeneration. The current study contributes to understanding the in-depth mechanisms of mechanical signals affecting cell function and provides inspiration for innovative design of biomaterials.

关键词： bioactive materials tissue regeneration 3D micropattern force paracrine mechanotransduction

Efficient quantum dot infrared solar cells with enhanced lowenergy photon conversion via optical engineering

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Nano Research 2023年第2期16卷 2392-2398页

作者： Sisi Liu Ming-Yu Li Kao Xiong Jianbo Gao Xinzheng Lan Daoli Zhang Liang Gao Jianbing Zhang Jiang Tang School of science Wuhan University of TechnologyWuhan 430070China School of Optical and Electronic Information Wuhan National Laboratory for Optoelectronics(WNLO)Huazhong University of Science and Technology(HUST)Wuhan 430074China Department of Chemistry Brock UniversitySt.CatharinesON L2S 3A1Canada Wenzhou Advanced Manufacturing technology Research institute Huazhong University of Science and TechnologyWenzhou 325035China shenzhen huazhong university of science and technology Research institute Shenzhen 518057China Optics Valley Laboratory Wuhan 430074China

Infrared(IR)solar cells are promising devices for improving the power conversion efficiency(PCE)of conventional solar cells by expanding the utilization region of the sunlight spectrum to near-infrared *** solar cells based on colloidal quantum dots(QDs)have attracted extensive attention due to the widely tunable absorption spectrum controlled by dot size and the unique solution ***,the trade-off in QD solar cells between light absorption and photo-generated carrier collection has limited the further improvement of ***,we present high-performance PbS QD IR solar cells resulting from the combination of boosted light absorption and optimized carrier *** constructing an optical resonance cavity,the light absorption is significantly enhanced in the range of 1,150–1,300 nm at a relatively thin photoactive ***,the thin photoactive layer facilitates efficient carrier ***,the PbS QD IR solar cells exhibit a highly efficient photoelectric conversion in the IR region,resulting in a high IR PCE of 1.3%which is comparable to the highest value of solution-processed IR solar cells based on PbSe *** results demonstrate that constructing an optical resonance cavity is a reasonable strategy for effective conversion of photons in the devices aiming at light in a relatively narrow wavelength range,such as IR solar cells and narrow band photodetectors.

关键词： infrared solar cells PbS quantum dots optical resonance carrier extraction