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We demonstrate a dynamic plasmonic colour display technique based on catalytic magnesium metasurfaces. Controlled hydrogenation and dehydrogenation of the constituent magnesium nanoparticles, which serve as dynamic pixels, allow for plasmonic colour tuning, erasing, and restoring.
To improve the mobility of locomotive devices on loose, sandy terrain, protrusions or convex patterns called lugs (i.e., grousers) are attached to the surface of a locomotive modulus. Following our previous study, in which the effects of angular speed, lug sinkage length, and soil cumulative deformation on lug-soil interaction forces during the fixed-axis rotational motion were experimentally confirmed,...
Crowd motion segmentation problem is a hot issue in crowd behavior analysis and action recognition. A number of methods have been proposed to tackle this problem. Among the existing methods, most used flow dynamics to model the crowd motion, with only a few taking the collective property into consideration. In this paper, we proposed a crowd motion segmentation approach based on streak flow and crowd...
In the recent years, the Yangtze River shipping has been developed rapidly, but the bridge constructions worsen the navigation environment and became some blocks in the navigation. This research selects the waterway of the Wuhan Yangtze River Bridge area as the research object, which is the traffic bottleneck in the middle reaches of the Yangtze River because the bridge has 8 piers in the river. In...
Aiming at the lack of stability and precision of the traditional greenhouse monitoring system, we constructed the intelligent monitoring system to monitor the light intensity and CO2 concentration of strawberries greenhouses that is based on the STM32 single-chip, by which the light intensity and CO2 concentration can be acquired and displayed at the same time. The serial communication is used to...
The key to improving the photovoltaic power generation and optimizing the performance of photovoltaic inverters is the improvement of the control method. This paper introduces two improved PI control methods, the two control methods are all using SPWM wave as the inverter power switch control signal. The algorithm is easy to be digitally implemented, the computation is small, the support effect is...
The traditional ortho-rectification technique for remotely sensed imagery, which is performed on the basis of ground image processing platform, has been unable to meet the timeliness requirements. To solve this problem, this paper presents the research on ortho-rectification technique based on field programmable gate array (FPGA) platform, which can be implemented onboard and spaceborne for a real-time...
The unique properties of plasmonic Fano resonances have drawn extraordinary attention owing to their potential for interesting applications in biochemical sensing, slow light devices, near-field enhancement, and active plasmonics. Recent experiments have demonstrated that Fano resonances can be generated from a plasmonic nanocluster (nano-blossom) due to the destructive interference of the superradiant...
Deep learning is widely used in computer vision. In this study, we present a new method based on Convolutional Neural Networks (CNN) and subspace learning for face recognition under two circumstances. A very deep CNN architecture called VGG-Face, which learned on a large scale database, is used as feature extractor to extract the activation vector of the fully connected layer in the CNN architecture...
Precise timing by the technique of GNSS common view is proven to be an effective technique with the accuracy of nanosecond level in real-time mode. The timing technique of carrier phase is also applied in post mode with the accuracy of sub-nanosecond level, but the real-time mode still has little explicit research. In this study, we develop the precise timing algorithm of carrier phase to investigate...
Model–View–Controller pattern has been adopted as an architecture for World Wide Web applications in major programming languages. Though, many commercial and noncommercial web frameworks are very popular and applied widely, they are not particularly suitable for small applications. In this paper, the principle and basic components of MVC pattern are analyzed. Another new very Lightweight MVC framework...
Traffic classification is becoming one of the major applications in the data center networks with a lot of cloud services. Recent works about software defined networking (SDN) have found new ways to manage data center networks. However, with the imbalance of the elephant and mice flows is sharpening, the accuracy and efficiency of traffic classification have become more and more important in SDN management...
Vehicle detection can provide volumes of useful data for city planning and transport management. It has always been a challenging task because of various complicated backgrounds and the relatively small sizes of targets, especially in high resolution satellite images. A novel model called joint-layer deep convolutional neural networks (JLDCNNs), which joins features in the higher layers and the lower...
In this paper, we propose an efficient finite element method with impedance transmission boundary condition (ITBC) to significantly improve the numerical solutions of the optical waveguide problems. It utilizes the curl-conforming linear tangential and quadratic normal (LT/QN) edge elements to expand the tangential component of the electric field, and the second order nodal-based scalar basis functions...
Limited factors and calculation method of VOLTE capacity were analyzed in this paper. Firstly, several factors of the limited capacity were presented. Then, the influence of key technology was analyzed. At last, the calculation methods of each kind of restriction factors were analyzed and examples of calculation were proposed.
First, the paper analyzes the basic principle of the uplink MU-MIMO and gives the user matching conditions and application suggestion. Then, an estimation method of uplink MU-MIMO gain is presented based on the tests analysis. At last, the performance of uplink MU-MIMO in the current user condition is also given.
The optical waveguide structures, such as, photonic crystal fibers, plasmonic, and hybrid plasmonic waveguides, gain their extensive applications in communication, signal processing, integrated optics, and biophotonics. Advanced numerical methods with high efficiency and accuracy are required to determine propagation modes and to optimize geometrical and material parameters. An efficient mixed finite...
Graphene is a real 2D material with one atomic thickness. It has drawn increasing interests in many research subjects. Active plasmonics in graphene is an emerging field that allows manipulation and external control of light confined in a graphene-based structure. Broad tunability, fast modulation speed, extremely high field confinement, and low optical loss are advantages when comparing to traditional...
The next generation of space-borne synthetic aperture radar (SAR) systems will emphasize on high-resolution and wide-swath imaging. For these design purposes, multichannel technology in azimuth is a promising candidate. In the multichannel SAR system, the nonuniform azimuth signal needs to be reconstructed when the pulse repetition frequency (PRF) deviates from a specific one. The traditional digital...
In order to overcome cloud clutters and varied sizes of objects in high-resolution optical satellite images, a novel coarse-to-fine ship detection framework is proposed. Initially, a modified saliency fusion algorithm is derived to reduce cloud clutters and extract ship candidates. Then, in coarse discrimination stage, candidates are described by introducing shape feature to eliminate regions which...
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