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SR-AFU: super-resolution network using adaptive frequency component upsampling and multi-resolution features

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Frontiers of Computer Science 2023年第1期17卷 123-132页

作者： Ke-Jia CHEN Mingyu WU yibo zhang Zhiwei CHEN School of Computer Science Nanjing University of Posts and TelecommunicationsNanjing 210023China Jiangsu Key Laboratory of Big Data Security&Intelligent Processing Nanjing University of Posts and TelecommunicationsNanjing 210023China College of Telecommunications and Information Engineering Nanjing University of Posts and TelecommunicationsNanjing 210003China

Image super-resolution (SR) is one of the classic computer vision tasks. This paper proposes a super-resolution network based on adaptive frequency component upsampling, named SR-AFU. The network is composed of multiple cascaded dilated convolution residual blocks (CDCRB) to extract multi-resolution features representing image semantics, and multiple multi-size convolutional upsampling blocks (MCUB) to adaptively upsample different frequency components using CDCRB features. The paper also defines a new loss function based on the discrete wavelet transform, making the reconstructed SR images closer to human perception. Experiments on the benchmark datasets show that SR-AFU has higher peak signal to noise ratio (PSNR), significantly faster training speed and more realistic visual effects compared with the existing methods.

关键词： super-resolution multi-resolution features adaptive frequency upsampling wavelet transformation

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基于微流控芯片的鼠伤寒沙门氏菌免疫磁分离

食品科学 2025年第1期46卷 200-209页

作者：金彦王敬依程佳宁于乐民张壁臣张一博许童羽沈阳农业大学信息与电气工程学院辽宁沈阳110866 沈阳农业大学生物科学技术学院辽宁沈阳110866

开发一种用于鼠伤寒沙门氏菌快速分离与富集的免疫磁分离微流控系统,该系统由微流控芯片、微控制器、电磁分离与混合模块组成,具备电磁驱动混合和磁分离功能,能够实现免疫磁珠与鼠伤寒沙门氏菌的快速孵育、分离与富集。在最优条件下,可... 详细信息

开发一种用于鼠伤寒沙门氏菌快速分离与富集的免疫磁分离微流控系统,该系统由微流控芯片、微控制器、电磁分离与混合模块组成,具备电磁驱动混合和磁分离功能,能够实现免疫磁珠与鼠伤寒沙门氏菌的快速孵育、分离与富集。在最优条件下,可以在13 min内实现对牛奶样品中浓度范围为2×10^(1)~2×10^(6) CFU/m L鼠伤寒沙门氏菌的快速捕获与分离,捕获率在33.3%~67.5%之间,最低检测限为20 CFU/m L。因此,这种高度集成的免疫磁分离微流控系统能够从复杂食品基质中迅速、准确地富集目标细菌,为食源性致病菌的快速检测提供了有效的解决方案,对于应对食源性疾病引发的公共卫生问题具有重要意义。

关键词：鼠伤寒沙门氏菌免疫磁珠免疫磁分离主动电磁混合微流控芯片

Event-triggered control for containment maneuvering of second-order MIMO multi-agent systems with unmatched uncertainties and disturbances

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Chinese Journal of Aeronautics 2020年第11期33卷 2959-2971页

作者： yibo zhang Dan WANG Zhouhua PENG Lu LIU Shimin WANG School of Marine Electrical Engineering Dalian Maritime UniversityDalian 116026China Department of Electrical and Computer Engineering University of AlbertaEdmontonAlberta T5J 4P6Canada

This paper is concerned with distributed containment maneuvering of second-order Multi-Input Multi-Output(MIMO)multi-agent systems with non-periodic communication and *** agent is subject to unmatched nonlinear dynamics and external ***-triggered containment maneuvering control methods is developed based on a modular ***,an estimator module is constructed based on neural networks and the nonperiodic obtained follower information through event-triggered ***,a controller module is designed by using the identified information from the estimator module and a third-order linear tracking *** event-triggered mechanism is introduced for updating the ***,a path update law is designed based on the non-periodic leader information through event-triggered *** closed-loop system cascaded by the estimation subsystem and control subsystem is proved to be input-to-state stable,and Zeno behavior is excluded in the control *** proposed method is capable of reducing the consumption of communication and actuation.A simulation example is provided to substantiate the effectiveness of the proposed event-triggered control method for distributed containment maneuvering of second-order MIMO multi-agent systems.

关键词： Containment maneuvering Event-triggered control Modular design Multi-agent system Neural network

A novel approach to the attitude stabilization structure for ducted-fan operative aerial robots:Finding improvements for modeling error and strong external transient disturbance

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Chinese Journal of Aeronautics 2022年第2期35卷 250-264页

作者： Wei FAN Bin XU Changle XIANG yibo zhang Haiyang YANG School of Mechanical Engineering Beijing Institute of TechnologyBeijing 100081China Beijing Institute of Technology Chongqing Innovation Center Chongqing 401135China School of Automation Beijing Institute of TechnologyBeijing 100081China

This research concerns a novel attitude stabilization structure for a ducted-fan aerial robot to work against modeling error and strong external transient disturbance,and it focuses on two main control targets:modeling error compensation,and the improvement of disturbance resistance along the rolling *** the first research objective,we proposed an adaptive nominal controller with the reconfigurable control law design based on the estimation of the modeling error found in the *** of simulations and corresponding flight tests verified that the proposed adaptive control structure is robust against both constant and time-varying modeling *** the other research objective,a SAC(Stability Augmentation Control)structure was devised based on the CMG(Control Moment Gyroscope)theory in order to provide extra moment which effectively withstands the transient disturbance beyond the CDG(Critical Disturbance Gain).Furthermore,we studied the corresponding controller for the SAC via the SMC(sliding mode control)theory,while the working mechanism and performance of the SAC were verified through a specially devised prototype.

关键词： Adaptive control Disturbance rejection Ducted-fan aircraft Modeling error Stability augmentation systems

Synthetic aperture-based on-chip microscopy

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Light(Science & Applications) 2015年第1期4卷 438-446页

作者： Wei Luo Alon Greenbaum yibo zhang Aydogan Ozcan Electrical Engineering Department University of CaliforniaLos AngelesCA 90095USA Bioengineering Department University of CaliforniaLos AngelesCA 90095USA California NanoSystems Institute(CNSI) University of CaliforniaLos AngelesCA 90095USA Department of Surgery David Geffen School of MedicineUniversity of CaliforniaLos AngelesCA 90095USA

Wide field-of-view(FOV)and high-resolution imaging requires microscopy modalities to have large space-bandwidth *** on-chip microscopy decouples resolution from FOV and can achieve a space-bandwidth product greater than one billion under unit magnification using state-of-the-art opto-electronic sensor chips and pixel super-resolution ***,using vertical illumination,the effective numerical aperture(NA)that can be achieved with an on-chip microscope is limited by a poor signal-to-noise ratio(SNR)at high spatial frequencies and imaging artifacts that arise as a result of the relatively narrow acceptance angles of the sensor’s ***,we report,for the first time,a synthetic aperture-based on-chip microscope in which the illumination angle is scanned across the surface of a dome to increase the effective NA of the reconstructed lensfree image to 1.4,achieving e.g.,,250-nm resolution at 700-nm wavelength under unit *** synthetic aperture approach not only represents the largest NA achieved to date using an on-chip microscope but also enables color imaging of connected tissue samples,such as pathology slides,by achieving robust phase recovery without the need for multi-height scanning or any prior information about the *** validate the effectiveness of this synthetic aperture-based,partially coherent,holographic on-chip microscope,we have successfully imaged color-stained cancer tissue slides as well as unstained Papanicolaou smears across a very large FOV of 20.5 mm^(2).This compact on-chip microscope based on a synthetic aperture approach could be useful for various applications in medicine,physical sciences and engineering that demand high-resolution wide-field imaging.

关键词： computational imaging lensfree microscopy on-chip microscopy synthetic aperture

A Novel Nano-sized Catalyst CeO2-CuO/Hollow ZSM-5 for NOx Reduction with NH3

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Chemical Research in Chinese Universities 2018年第4期34卷 661-664页

作者： YI Ting LI Jingwei zhang yibo YANG Xiangguang State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 P. R. China University of Chinese Academy of Sciences Beijing 100049 P. R. China Jilin Province Key Laboratory of Green Chemistry and Process Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 P. R. China Institute of Carbon Materials Science Shanxi Datong University Datong 037009 P. R. China

Hollow-ZSM-5 was synthesized by a traditional hydrothermal method without alcohol, and a novel nano-sized Ce-Cu/hollow ZSM-5 sample was prepared by conventional incipient wetness impreganation. The catalysts were characterized by TEM, SEM, XRD, NMR and N2 adsorption-desorption. The results indicate that the hollow-ZSM-5 has a good MFI structure with large surface area. The synthesized CeO2-CuO/hollow ZSM-5 showed an excellent catalytic activity for NOx conversion（90% NOx conversion were obtained） in the temperature range of 340-550℃ under GHSV=480000 mL. g^-1.h^-1 due to its appropriate redox ability and acidity.

关键词： Hollow-ZSM-5 Selective catalytic reduction Hydrothermal method NOx conversion

Sinter-resistant and high-efficient Pt/CeO2/NiAl2O4/Al2O3@SiO2 model catalysts with “composite energy traps”

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Science China Chemistry 2020年第4期63卷 519-525页

作者： Jingwei Li Kai Li Liwei Sun Zeshu zhang Zhijian Wu yibo zhang Xiangguang Yang State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China Institute of Carbon Materials Science Shanxi Datong UniversityDatong 037009China Jilin Provincial Key Laboratory of Green Chemistry and Process Changchun Institute of Applied ChemistryChangchun 130022China

The stability of nanosized catalysts at high temperature is still a challenging topic and is a crucial criterion to evaluate their suitability for industrial use. Currently, the strategy to improve the high-temperature stability of nano-sized catalysts is to restrict the migration of particles on the surface, which, however, lacks theoretical knowledge and directions. Herein, we reported a new approach that can effectively inhibit the migration and agglomeration of supported nanoparticles by fabrication of a model catalyst Pt/CeO2/NiAl2O4/Al2O3@SiO2. This catalyst is highly stable with the microstructure unchanged even after being aged at 1000 °C. Density functional theory calculations indicate that two types of confinement effects exist in the catalyst and their mechanisms were well explained from the viewpoint of "energy traps" which can also be applied to other supported catalysts.

关键词： stability of nanosized catalysts the migration and agglomeration of supported nanoparticles energy trap two types of confinement effects

Rational construction of Ag@MIL-88B(V)-derived hierarchical porous Ag-V_(2)O_(5) heterostructures with enhanced diffusion kinetics and cycling stability for aqueous zinc-ion batteries

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Journal of Energy Chemistry 2023年第2期77卷 561-571,I0015页

作者： yibo zhang Zhihua Li Liangjun Gong Xuyu Wang Peng Hu Jun Liu School of Materials Science and Engineering Central South UniversityChangsha 410083HunanChina Key Laboratory of Nonferrous Metal Materials Science and Engineering of Ministry of Education Central South UniversityChangsha 410083HunanChina School of Environmental and Chemical Engineering Jiangsu University of Science and TechnologyZhenjiang 212003JiangsuChina Fine Chemical Industry Research Institute School of ChemistrySun Yat-Sen UniversityGuangzhou 510275GuangdongChina

With the advantages of the multiple oxidation states and highly open crystal structures,vanadium-based composites have been considered as the promising cathode materials for aqueous zinc-ion batteries(ZIBs).However,the inherent inferior electrical conductivity,low specific surface area,and sluggish Zn^(2+)diffusion kinetics of the traditional vanadium-based oxides have greatly impeded their ***,a novel hierarchical porous spindle-shaped Ag-V_(2)O_(5) with unique heterostructures was rationally designed via a simple MOF-assisted synthetic method and applied as stable cathode for aqueous *** high specific surface area and hierarchically porous superstructures endowed Ag-V_(2)O_(5) with sufficient electrochemical active sites and shortened the diffusion pathways of Zn^(2+),which was beneficial to accelerate the reversible transport of Zn^(2+)and deliver a high specific capacity(426 mA h g^(-1) at 0.1 A g^(-1) and 96.5%capacity retention after 100 cycles).Meanwhile,the self-built-in electric fields at the heterointerface of Ag-V_(2)O_(5) electrode could strengthen the synergistic coupling interaction between Ag and V_(2)O_(5),which can effectively enhance the electric conductivity and maintain the structural integrity,resulting in superb rate capability(326.1 mA h g^(-1) at 5.0 A g^(-1))and remarkable cycling stability(89.7%capacity retention after 2000 cycles at 5.0 A g^(-1)).Moreover,the reversible Zn^(2+)storage mechanism was further investigated and elucidated by kinetics analysis and DFT calculations.

关键词： Aqueous zinc-ion batteries Metal-organic frameworks V_(2)O_(5) Heterostructures Nano silver

Separating the effects of two dimensions on ecosystem services:Environmental variables and net trade-offs

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Journal of Geographical Sciences 2023年第4期33卷 845-862页

作者： ZUO Liyuan JIANG Yuan GAO Jiangbo DU Fujun zhang yibo Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources ResearchCASBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China

Spatial and temporal changes in ecosystem services(ESs)are driven by two types of factors:environmental factors and trade-offs/synergies between *** the ecological conservation red line(ECRL)area,in which national ecological security and social sustainable development are guaranteed,it is particularly important to clarify the driving mechanism of ESs for the management of *** this study,soil conservation,water yield,and carbon sequestration in Beijing’s ECRL area are quantified,and GeoDetector is used to identify the factors influencing the trade-offs/synergies between ***,partial correlation analysis is used to calculate the net trade-offs/synergies and compare them with the extent to which environmental variables contribute to *** results are as follows:environmental variables and trade-offs/synergies have different effects on the changes in ESs,and their interactions can enhance the determinative power of the corresponding individual *** land use intensity is an extremely important factor affecting the trade-offs/synergies between the three services,indicating that rational land use planning in Beijing’s ECRL area is crucial for avoiding the negative impacts of trade-offs and enabling coordinated optimization of *** the elimination of the cross-influence of environmental variables,the trade-offs/synergies change significantly,and the impact of environmental variables on ESs is compared with the net trade-offs/*** variables are the driving forces of the spatiotemporal changes in soil *** and carbon sequestration have similar effects on water *** changes in carbon sequestration are closely related to the other two services,with smaller influences from environmental variables.

关键词： ecosystem services trade-offs and synergies driving mechanisms quantitative separation ecological conservation red line area