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Dual Functional Diblock Amino Acid Copolymer Displaying Synergistic Effect with Curcumin against MRSA and Encapsulation of Curcumin

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Chinese Journal of Chemistry 2023年第23期41卷 3333-3338页

作者： Yueming Wu Yuan Chen Haowen Yu Alideertu Dong Runhui Liu State Key Laboratory of Bioreactor Engineering East China University of Science and TechnologyShanghai200237 China Key Laboratory for Ultrafine Materials of Ministry of Education Frontiers Science Center for Materiobiology and Dynamic Chemistry Shanghai Frontiers Science Center of Optogenetic Techniques for Cell MetabolismResearch Center for Biomedical Materials of Ministry of EducationSchool of Materials Science and EngineeringEast China University of Science and TechnologyShanghai200237 China Engineering Research Center of Dairy Quality and Safety Control Technology Ministry of EducationInner Mongolia UniversityHohhotInner Mongolia010021 China

The intensive use of antibiotics intensifies the development of bacterial resistance,which has become a serious problem ***-resistant Staphylococcus aureus(MRSA)has resulted in significant morbidity and ***,it is an urgent need to develop new antimicrobial drugs and administration ***,we report a dual functional diblock copolymer PLL20-b-PBLG20,which was prepared by superfast and water-insensitive polymerization on N-carboxyanhydrides(NCA)initiated by tetraalkylammonium *** addition to direct antimicrobial activity,PLL20-b-PBLG20 also exerts a synergistic bactericidal effect against MRSA with curcumin,a plant extract with antibacterial ***,PLL20-b-PBLG20 successfully encapsulates curcumin to form nanoparticles via *** combination of dual functional PLL20-b-PBLG20 and curcumin holds promise in combating MRSA infections.

关键词： Amino acid polymer Antimicrobial Synergy Encapsulation MRSA

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A novel DOA estimation algorithm using directional antennas in cylindrical conformal arrays

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Defence technology（防务技术） 2021年第3期17卷 1042-1051页

作者： Xiao-feng Gao Ping Li Xin-hong Hao Guo-lin Li Zhi-jie Kong Science and Technology on Electromechanical Dynamic Control Laboratory School of Mechatronical EngineeringBeijing Institute of TechnologyBeijing100081China China Academy of Launch Vehicle Technology Beijing100076China

In this paper, a novel direction of arrival(DOA) estimation algorithm using directional antennas in cylindrical conformal arrays(CCAs) is proposed. To eliminate the shadow effect, we divide the CCAs into several subarrays to obtain the complete output vector. Considering the anisotropic radiation pattern of a CCA, which cannot be separated from the manifold matrix, an improved interpolation method is investigated to transform the directional subarray into omnidirectional virtual nested arrays without non-orthogonal perturbation on the noise vector. Then, the cross-correlation matrix(CCM) of the subarrays is used to generate the consecutive co-arrays without redundant elements and eliminate the noise vector. Finally, the full-rank equivalent covariance matrix is constructed using the output of co-arrays,and the unitary estimation of the signal parameters via rotational invariance techniques(ESPRIT) is performed on the equivalent covariance matrix to estimate the DOAs with low computational complexity. Numerical simulations verify the superior performance of the proposed algorithm, especially under a low signal-to-noise ratio(SNR) environment.

关键词： Direction of arrival(DOA) Conformal antenna array Interpolation technique Nested array

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Ultrasonic Wireless Power and Data Transmission technology Across Conical Metal Shell

Ultrasonic Wireless Power and Data Transmission Technology A...

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International Symposium on Antennas, Propagation and EM Theory (ISAPE)

作者： Jiemeihui Li Haibin Wang Teng Long Nuoxin Zhang Gan Zhang Yuanting Huang Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an Institute of Electromechanical Information Technology Xi'an China

ISBN: (数字)9798350353129

ISBN: (纸本)9798350353136

Aiming to address the issue of wireless power and data transmission in closed conical metal shell, the ultrasonic transducer is introduced into the system. The system for ultrasonic transmission is constructed with a pair of radially polarized circular tube transducers, a metal spacer block attached to one of the transducers, and a conical shell. The finite element analysis software COMSOL is utilized to investigate the modal changes in the system during power transmission, while also analyzing the impact of receiving transducer height and relative position on power transmission. Ultrasonic data communication experimental results demonstrate that reliable data can be transmitted across the conical shell using binary frequency shift keying modulation and demodulation techniques at a communication rate reaching 1kbps.

关键词： Wireless communication Ultrasonic transducers Transducers Transmitting antennas Metals Power transmission Acoustics Software reliability Data communication Demodulation

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Fuze Echo of Background Adaptability Evaluation Model Based on Data Driven

Fuze Echo of Background Adaptability Evaluation Model Based ...

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International Symposium on Antennas, Propagation and EM Theory (ISAPE)

作者： Gang Li Haichao Zhong Chengcheng Yang Chi Zhang Juntao Cui Tie Li Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an Institute of Electromechanical Information Technology Xi'an China

ISBN: (数字)9798350353129

ISBN: (纸本)9798350353136

To address the need for evaluating the adaptability of radio proximity fuze components under complex conditions, a data-driven modeling method based on target characteristics for assessing fuze echo adaptability to ground backgrounds is proposed. The study investigates the impact of soil moisture content on fuze echo responses, using silty soil as an example. The variation in scattering coefficients of silty soil with different moisture levels and grazing angles is provided. The results show that the scattering coefficient is significantly affected by soil moisture content. For instance, at a grazing angle of 90° and moisture content of 1%, the scattering coefficient is about -8 dB, while at 40% moisture content, the scattering coefficient increases to 3 dB. Using the developed fuze ground background adaptability evaluation model, the echo response characteristics of Ka-band fuzes under different moisture levels were predicted. The results indicate that higher moisture content leads to a higher signal-to-noise ratio in fuze echoes.

关键词： Adaptation models Dielectric constant Monte Carlo methods Soil moisture Evaluation models Electromagnetic scattering Moisture Surface roughness Rough surfaces Signal to noise ratio

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The Influence of Jungle Background on the Dispersal Pattern of Fuze Explosion Points

The Influence of Jungle Background on the Dispersal Pattern ...

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International Symposium on Antennas, Propagation and EM Theory (ISAPE)

作者： Chengcheng Yang Haichao Zhong Gang Li Tie Li Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an Institute of Electromechanical Information Technology Xi'an China

ISBN: (数字)9798350353129

ISBN: (纸本)9798350353136

To address the poor adaptability of guided suppression fuzes in jungle backgrounds and enhance radio fuzes' target detection, identification, and anti-jamming capabilities, a study was conducted on the impact of jungle background on fuze burst point control accuracy. Based on the measured data of the backward scattering characteristics of the jungle collected by the fuze, the distribution characteristics of fuze burst points under different wavebands and pitch angles in the jungle background were obtained. The study analyzed the effects of the jungle environment on the fuze's distance-setting accuracy. The findings indicate a strong correlation between the distribution of burst points and the electromagnetic scattering characteristics of the jungle. The dispersion of burst points follows a Gaussian distribution. At a test distance of 30 m, with fuze wavebands in the K, Ka, and V bands and HH polarization, and pitch angles between 30° and 60°, the impact of the jungle background on burst point deviation is within the range of $\pm \mathbf{5} \mathbf{m}$ . The distance distribution of the fuze is 33.5-34.5 m on asphalt surfaces, while it significantly increases to 32–41 m in jungle backgrounds, with a dispersion increase rate of 77%.

关键词： Measurement Accuracy Surface waves Weapons Vegetation Object detection Gaussian distribution Explosions Dispersion Standards

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Direct Printing of Curved Conformal Antennas

Direct Printing of Curved Conformal Antennas

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International Symposium on Antennas, Propagation and EM Theory (ISAPE)

作者： Gaoling Ma Helong Jin Xiaojun Zhi Zhenye Gao Haichao Zhong Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an Institute of Electromechanical Information Technology Xi'an China

ISBN: (数字)9798350353129

ISBN: (纸本)9798350353136

Conformal antenna has the characteristics of miniaturization, low profile and large aperture, which is one of the key antenna development trends in the future. How to realize the conformal printing of antennas has been a tricky problem. We propose a high-precision microdroplet jet printing method of conformal antenna, which realizes direct conformal antenna direct printing on curved surfaces. By theoretically deriving the directional map function of an arbitrary directed array, a conical conformal antenna model is established, and the directional map function of the conformal antenna array is obtained. The test results show that the strategy can accurately print a conformal antenna on a curved surface, and the antenna's operating frequency is basically the same as that of the design, with a small return loss, which can satisfy the performance and usage requirements, and it can provide a technical basis for the subsequent design and processing of conformal antennas.

关键词： Printing Antenna theory Directive antennas Propagation losses Aperture antennas Wire Antennas Surface treatment Substrates Antenna arrays

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Attenuation Characteristics of Laser Fuzes in Low-Visibility Dust Environments

Attenuation Characteristics of Laser Fuzes in Low-Visibility...

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International Symposium on Antennas, Propagation and EM Theory (ISAPE)

作者： Haichao Zhong Gang Li Bo Tian Yongdiao Wen Wei Li Tie Li Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an Institute of Electromechanical Information Technology Xi'an China

ISBN: (数字)9798350353129

ISBN: (纸本)9798350353136

To address the issue of multiple scattering in the propagation of laser fuzes in low-visibility dusty environments, an experiment was conducted to measure the transmittance of laser in such conditions. The corresponding attenuation coefficient was derived based on the Beer-Lambert law. The results indicate that in low-visibility conditions, laser energy attenuates more severely in a dusty environment, with the attenuation coefficient decreasing exponentially as visibility decreases. For instance, at a visibility of 50m, the attenuation coefficient is 192dB/km, and at a visibility of 100m, it is 85dB/km. The experimental results were compared with independent scattering Mie theory calculations and Monte Carlo simulations that consider multiple scattering effects. The findings show significant discrepancies between the experimentally measured attenuation coefficients and Mie theory predictions under low-visibility conditions, whereas the differences with Monte Carlo simulation results, which account for multiple scattering and dust particle shape factors, are smaller. However, the Monte Carlo results are still lower than the experimental measurements in low-visibility conditions. The study concludes that when dust visibility is below approximately 200m, laser transmission simulations must consider multiple scattering and other influencing factors.

关键词： Laser theory Monte Carlo methods Atmospheric measurements Shape Shape measurement Scattering Measurement by laser beam Attenuation measurement Attenuation Particle measurements

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Mainlobe Deceptive Jamming Mitigation through Transceiver Design with MDC Radar

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IEEE Transactions on Vehicular technology 2025年

作者： Zhang, Xiang Lan, Lan Zhang, Ke Li, Jun Xu, Jingwei Liao, Guisheng Xidian University National Key Laboratory of Radar Signal Processing Xi'an710071 China Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an China

In complex electromagnetic environment, deceptive jamming, especially those mainlobe rapidly-generated jamming signals pose a significant threat to radar systems. To address this issue, a Multi-Domain Coding (MDC) scheme with the optimized transceiver architecture is investigated in this paper to suppress mainlobe deceptive jamming signals. At the configuration stage, the Linear Frequency Modulation (LFM) waveforms are transmitted and encoded in the spatial, slow-time, and fast-time domains. At the receiver, the received signals are separated based on the modulated Doppler frequency. In this regard, in order to solve the problem of waveform misalignment caused by high-speed moving targets, an approach to determine the misalignment coefficient is proposed according to beamforming energy differences. In addition, a dual-phase compensation method is developed to distinguish the false targets through transmit spatial frequencies. Additionally, to address the problem of performance degradation due to Direction of Arrive (DOA) errors, an optimization problem aiming to maximize the output Signal-to-Interference-plus-Noise Ratio (SINR) is formulated. To solve this, an Maximum Block Improvement (MBI)-based alternating algorithm is employed to optimize the transmit parameters and receive filter. Simulations results demonstrate the superiority of MDC scheme with optimized parameters in suppressing mainlobe deceptive jamming signals in the presence of DOA errors over radar framework counterparts. © 1967-2012 IEEE.

关键词： Image segmentation

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Self-Supervised Sparse Direct Visual Odometry with Half-Geometric Correspondence Network 13

Self-Supervised Sparse Direct Visual Odometry with Half-Geom...

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13th International Conference on Electronics, Communications and Networks, CECNet 2023

作者： Zhang, Tenglong Li, Qing Zhou, Miaosheng Yu, Fei Beijing Information Science & Technology University Beijing100192 China Beijing Key Laboratory of High Dynamic Navigation Technology Beijing100192 China Ministry of Education Key Laboratory of Modern Measurement & Control Technology Beijing100192 China Beijing SinsTek Measurement & Control Co. Ltd. Beijing101300 China Beijing Star Network Yuda Technology Co Beijing100097 China

ISBN: (纸本)9781643684802

Current mainstream visual odometry method often suffers from tracking lost in low texture and motion blur scenarios due to fewer effective features and difficulty in getting stable matches. And feature matching process affects the overall real-time performance. For the fast localization task in low texture environments, this paper proposes an efficient self-supervised direct visual odometry framework based on keypoint extraction network, HGCN-VO. First we build the half-geometric correspondence network, HGCN, for fast extraction of robust keypoints in images. During training, we propose training method which uses basic shape elements to render generated simulated images with pseudo-labels as well as random homography transformations on real images for pre-training and migration learning and optimizing the keypoint loss from forward and reverse perspective transformed images. Finally we optimize the inter-frame position using a multilayer sparse direct method combined with bundle adjustment to improve the robustness of the method in low texture environments while increasing the processing speed. We evaluated the proposed method in KITTI, TUM, and challenging low-texture real-world scenarios and compared it with the current mainstream visual odometry methods, and the results show that the algorithm is sufficiently robust and accurate in low-texture environments and has a fast processing speed. © 2024 The authors and IOS Press.

关键词： Textures

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Application of Target Electromagnetic Scattering Characteristics in Short-Range dynamic Detection 13

Application of Target Electromagnetic Scattering Characteris...

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13th International Symposium on Antennas, Propagation and EM Theory, ISAPE 2021

作者： Hu, Wenhui Li, Gang Li, Wei Tian, Bo Li, Tie Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an China

ISBN: (纸本)9781665418126

In view of the way that radio fuse probe target for echo information with dynamic scanning detection in the scene of near-field, this paper designed an experiment of the application scheme, which the scheme used radar to image electromagnetic scattering from a target of interest, the complex echo signals in the detection results were divided according to the time series and the RCS mean value of the corresponding region was calibrated, thus the time-resolved/part-resolved target information can be used in the design and verification of near-field detector, providing a new method for the application of target characteristic information in the process of short-range dynamic detection. © 2021 IEEE.

关键词： Electromagnetic wave scattering

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