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Nano Research 2023年第5期16卷 6094-6103页

作者： Bingchen Zhang Xihao Han Wenpei Kang Daofeng Sun School of Materials Science and Engineering China University of Petroleum(East China)Qingdao 266580China

Hydrated vanadium oxide(VOH)is a promising cathode candidate for the aqueous zinc-ion batteries(AZIBs),due to the large interlayer spacing and high capacity.However,severe pulverization and structure collapse upon cycling limit its practical application.Herein,preintercalation strategy with higher positive charge of Cr^(3+) is proposed to regulate the structure and oxygen defect of the VOH-O_(d).The VOH-O_(d) with moderated amount of Cr^(3+) incorporation(M-CrVOH-O_(d)),showing a flower-like hierarchical structure assembled with thin nanosheets,can expand the interlayer spacing and increase the oxygen defect,inducing an enhanced high-rate cycling capability.As a result,M-CrVOH-O_(d) delivers a high capacity of 405 mAh·g^(−1)at 0.5 A·g^(−1),high capacity retention of 120%over 3,500 cycles,as well as an extraordinary energy output(297.3 Wh·kg^(−1)at 355.9 W·kg^(−1)).The density functional theory(DFT)calculations can prove the enhanced reaction kinetics with narrower bandgap and lower Zn^(2+) adsorption energy after the Cr-preintercalation.Meanwhile,based on the ex-situ X-ray diffraction(XRD)analysis,synergistic intercalation of the Zn^(2+)/H^(+)into the interlayers of M-CrVOH-O_(d) can bring the high specific capacity.This work could help us understand the enhanced performance of VOH from the point of the chemical reactions.

关键词： hydrated vanadium oxide preintercalation cathode aqueous zinc-ion batteries

Analysis of phase preservation and interferometric offset test in sparse SAR imaging

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Science China(Information Sciences) 2024年第2期67卷 219-231页

作者： Zhongqiu XU Bingchen Zhang Guangzuo LI Xueli ZHAN Yanfei BAO Yirong WU Key Laboratory of Spatial Information Processing and Application System Technology Chinese Academy of Sciences Aerospace Information Research Institute Chinese Academy of Sciences School of Electronic Electrical and Communication EngineeringUniversity of Chinese Academy of Sciences PLA Academy of Military Sciences

Sparse synthetic aperture radar(SAR) imaging has emerged as a reliable microwave imaging scheme in the recent decade and excels in down-sampling reconstruction and full-sampling performance improvements such as noise, sidelobe, speckle, and ambiguity suppression. To utilize complex image products of sparse reconstruction for improvement in polarimetric, interferometric, and tomographic SAR imaging, it is necessary to evaluate the phase preservation of sparse SAR imaging. In this study, we first introduce the general alternating direction method of multipliers(ADMM) as the universal framework for sparse reconstruction algorithms and adopt chirp scaling algorithm(CSA)-based azimuth-range decouple operators to avoid expensive data storage and processing. Further, we theoretically analyze the phase preservation of the sparse reconstruction algorithm through a comparison with the reconstruction results of CSA. Finally,we conduct the interferometric offset test on the sparse reconstruction results of simulated and real Gaofen-3(GF-3) SAR data, demonstrating the phase-preserving ability of sparse methods.

关键词： sparse SAR imaging phase preservation interferometric offset test general ADMM azimuth-range decouple

A SAR imaging method based on generalized minimax-concave penalty

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Science China(Information Sciences) 2019年第2期62卷 233-239页

作者： Zhonghao WEI Bingchen Zhang Yirong WU University of Chinese Academy of Sciences Key Laboratory of Technology in Geospatial Information Processing and Application Systems Institute of Electronics Chinese Academy of Sciences Institute of Electronics Chinese Academy of Sciences

Dear editor,Sparse signal processing offers a framework for synthetic aperture radar （SAR） imaging [1, 2]. As an efficient tool in sparse signal processing, L1minimization is often used in the reconstruction of SAR images. When implemented in SAR imaging [3–5], L;minimization offers significant improvement in the properties by suppressing the sidelobes and clutter. However, L;minimization is known to be a biased estimator. The L;minimization based algorithms such as the iterative

关键词： SAR A SAR imaging method based on generalized minimax-concave penalty

Baseline distribution optimization and missing data completion in wavelet-based CS-Tomo SAR

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Science China(Information Sciences) 2018年第4期61卷 164-172页

作者： Hui BI Jianguo LIU Bingchen Zhang Wen HONG Science and Technology on Microwave Imaging Laboratory Institute of ElectronicsChinese Academy of Sciences University of Chinese Academy of Sciences Department of Earth Science and Engineering Imperial College London

In this paper, we propose a coherence of measurement matrix-based baseline distribution optimization criterion, together with an L1 regularization missing data completion method for unobserved baselines(not belonging to the actual baseline distribution), to facilitate wavelet-based compressive sensingtomographic synthetic aperture radar imaging(CS-Tomo SAR) in forested areas. Using M actual baselines,we first estimate the optimal baseline distribution with N baselines(N > M), including N-M unobserved baselines, via the proposed coherence criterion. We then use the geometric relationship between the actual and unobserved baseline distributions to reconstruct the transformation matrix by solving an L1 regularization problem, and calculate the unobserved baseline data using the measurements of actual baselines and the estimated transformation matrix. Finally, we exploit the wavelet-based CS technique to reconstruct the elevation via the completed data of N baselines. Compared to results obtained using only the data of actual baselines, the recovered image based on the dataset obtained by our proposed method shows higher elevation recovery accuracy and better super-resolution ability. Experimental results based on simulated and real data validated the effectiveness of the proposed method.

关键词： tomographic synthetic aperture radar imaging(Tomo SAR) compressive sensing(CS) baseline distribution optimization coherence of measurement matrix

Microstructural evolution and energetic characteristics of TiZrHfTa_(0.7)W_(0.3)high-entropy alloy under high strain rates and its application in high-velocity penetration

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Journal of Materials Science & Technology 2023年第1期132卷 144-153页

作者： Weiqi Tang Kun zhang Tianyu Chen Qiu Wang bingchen Wei Key Laboratory of Microgravity(National Microgravity Laboratory) Institute of MechanicsChinese Academy of SciencesBeijing 100190China School of Engineering Science University of Chinese Academy of SciencesBeijing 100049China State Key Laboratory of High Temperature Gas Dynamics Institute of MechanicsChinese Academy of SciencesBeijing 100190China

Energetic structural materials(ESMs)integrated a high energy density and rapid energy release with the ability to serve as structural materials.Here,a novel triple-phase TiZrHfTa_(0.7)W_(0.3)high-entropy alloy(HEA)was fabricated and investigated as a potential ESM.A hierarchical microstructure was obtained with a main metastable body-centered-cubic(BCC)matrix with distributed Ta-W-rich BCC precipitates of various sizes and interwoven hexagonal close-packed(HCP)lamellar nano-plates.The compressive me-chanical properties were tested across a range of strain rates and demonstrated a brittle-to-ductile tran-sition as the strain rate increased while maintaining a high ultimate strength of approximately 2.5 GPa.This was due to the phase transformation from metastable matrix BCC to HCP structures.In addition,during the dynamic deformation,metal combustion originating from the failure surface was observed.Furthermore,the composition of the fragments was studied,and the results indicated that the addition of tungsten promoted combustion.Finally,the potential application of this HEA was evaluated by high-velocity penetration tests,and the results were compared to other typical structural materials for pene-trators and bullets.A comparison was conducted by assessing the geometries of the penetration channel employing two dimensionless parameters normalized by the projectile size,representing longitudinal and lateral damage,respectively.The normalized depth of the TiZrHfTa_(0.7)W_(0.3)HEA projectile was comparable to those of the other investigated materials,but the normalized diameter was the largest,showing an excellent ability to deliver lateral damage.

关键词： Energetic structural materials High-entropy alloys Phase transformation Ballistic tests

An improved iterative thresholding algorithm for L1-norm regularization based sparse SAR imaging

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Science China(Information Sciences) 2020年第11期63卷 330-339页

作者： Hui BI Yong LI Daiyin ZHU Guoan BI Bingchen Zhang Wen HONG Yirong WU College of Electronic and Information Engineering Nanjing University of Aeronautics and Astronautics Key Laboratory of Radar Imaging and Microwave Photonics Ministry of Education Nanjing University of Aeronautics and Astronautics School of Electrical and Electronic Engineering Nanyang Technological University Aerospace Information Research Institute Chinese Academy of Sciences

Dear editor,Sparse signal processing techniques have been widely used after being introduced to synthetic aperture radar (SAR) imaging, and have shown desirable potential in imaging performance improvement compared wi... 详细信息

关键词： Synthetic aperture radar Sparse microwave imaging SAR imaging Radar imaging Sparse signal processing

An efficient data compression technique based on BPDN for scattered fields from complex targets

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Science China(Information Sciences) 2017年第10期60卷 273-274页

作者： Xiangyin QUAN Bingchen Zhang Zhengdao WANG Chao GAO Yirong WU Institute of Electronics Chinese Academy of Sciences Department of Electrical and Computer Engineering Iowa State University Beijing Institute of Environmental Features China Aerospace Science and Industry Corporation

For complex targets, the scattered fields vary rapidly with frequency or aspect angle owing to diverse scattering mechanisms [1]. To comprehensively learn the characteristics of a target's signature, a large number of radar cross section (RCS) samples need to be collected and stored, which results in a heavy burden on the measurement equipment and the storage devices [2]. Since the scattering process of an electrically large target exhibits highly localized behavior related to the scattering mechanisms, its scattering physics can be modeled by a set of scattering centers [3]. In general, the scattering center model provides a sparse abstraction of radar targets. And it is insensitive to the variance of frequency and aspect angle. Compared with RCS samples, the number of corresponding scattering centers is far less. Thus, data compression can be achieved by transforming scattered fields into scattering centers and storing the backscattering coefficients and spatial positions of the extracted scattering centers.

关键词： RCS An efficient data compression technique based on BPDN for scattered fields from complex targets

DLSLA 3-D SAR imaging algorithm for off-grid targets based on pseudo-polar formatting and atomic norm minimization

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Science China(Information Sciences) 2016年第6期59卷 225-239页

作者： Qian BAO Kuoye HAN Xueming PENG Wen HONG Bingchen Zhang Weixian TAN Science and Technology on Microwave Imaging Laboratory (MITL) Institute of ElectronicsChinese Academy of Sciences (IECAS) School of Electronic and Communication Engineering University of Chinese Academy of Sciences (UCAS) Information System Technology Institute Information Science Academy of China Electronics Technology Group Corporation Global RD Centre (Shanghai) Carestream Health Incorporated College of Information Engineering Inner Mongolia University of Technology

This paper concerns the imaging problem for downward looking sparse linear array three-dimensional synthetic aperture radar(DLSLA 3-D SAR) under the circumstance of sparse and non-uniform cross-track dimensional virtual phase centers configuration. Since the 3-D imaging scene behaves typical sparsity in a certain domain, sparse recovery approaches hold the potential to achieve a better reconstruction performance. However,most of the existing compressive sensing(CS) algorithms assume the scatterers located on the pre-discretized grids, which is often violated by the off-grid effect. By contrast, atomic norm minimization(ANM) deals with sparse recovery problem directly on continuous space instead of discrete grids. This paper firstly analyzes the off-grid effect in DLSLA 3-D SAR sparse image reconstruction, and then introduces an imaging method applied to off-gird targets reconstruction which combines 3-D pseudo-polar formatting algorithm(pseudo-PFA) with ANM. With the proposed method, wave propagation and along-track image reconstruction are operated with pseudo-PFA, then the cross-track reconstruction is implemented with semidefinite programming(SDP) based on the ANM model. The proposed method holds the advantage of avoiding the off-grid effect and managing to locate the off-grid targets to accurate locations in different imaging scenes. The performance of the proposed method is verified and evaluated by the 3-D image reconstruction of different scenes, i.e., point targets and distributed scene.

关键词： atomic norm minimization DLSLA 3-D SAR sparse recovery off-grid targets pseudo-PFA 3-D imaging

A smart dual-drug nanosystem based on coassembly of plant and food-derived natural products for synergistic HCC immunotherapy

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Acta Pharmaceutica Sinica B 2021年第1期11卷 246-257页

作者： Bingchen Zhang Jiali Jiang Pengyu Wu Junjie Zou Jingqing Le Juanfang Lin Chao Li Bangyue Luo Yongjie zhang Rui Huang Jingwei Shao Fujian Provincial Key Laboratory of Cancer Metastasis Chemoprevention and Chemotherapy College of ChemistryFuzhou UniversityFuzhou 350116China Institute of Oceanography Minjiang UniversityFuzhou 350108China

Nanotechnology has emerged as an ideal approach for achieving the efficient chemo agent delivery.However,the potential toxicity and unclear internal metabolism of most nano-carriers was still a major obstacle for the clinical application.Herein,a novel"core-shell"co-assembly carrier-free nanosystem was constructed based on natural sources of ursolic acid(UA)and polyphenol(EGCG)with the EpCAM-aptamer modification for hepatocellular carcinoma(HCC)synergistic treatment.As the nature products derived from food-plant,UA and EGCG had good anticancer activities and low toxicity.With the simple and"green"method,the nanodrugs had the advantages of good stability,p H-responsive and strong penetration of tumor tissues,which was expected to increase tumor cellular uptake,long circulation and effectively avoid the potential defects of traditional carriers.The nanocomplex exhibited the low cytotoxicity in the normal cells in vitro,good biosafety of organic tissues and efficient tumor accumulation in vivo.Importantly,UA combined with EGCG showed the immunotherapy by activating the innate immunity and acquired immunity resulting in significant synergistic therapeutic effect.The research could provide new ideas for the research and development of self-assembly delivery system in the future,and offer effective intervention strategies for clinical HCC treatment.

关键词： Natural product Ursolic acid EGCG Aptamer Co-assembly Nanodrug HCC Synergistic treatment Immunotherapy

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Targeting self-enhanced ROS-responsive artesunatum prodrug nanoassembly potentiates gemcitabine activity by down-regulating CDA expression in cervical cancer

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Chinese Chemical Letters 2023年第7期34卷 186-192页

作者： Shengtao Wang Kunyi Yu Zhiyu Yu Bingchen Zhang Chaojie Chen Ling Lin Zibo Li Zhongjun Li Yuhua Zheng Zhiqiang Yu Affiliated Foshan Maternity&Child Healthcare Hospital Southern Medical University(Foshan Maternity&Child Healthcare Hospital)Foshan 528000China School of Pharmaceutical Sciences Southern Medical UniversityGuangzhou 510515China Department of Obstetrics and Gynecology Affiliated Dongguan HospitalSouthern Medical UniversityDongguan 523059China

Prodrug self-delivery carriers with targeting that specifically responded to tumor microenvironments have good potential to improve the application dilemma of approved clinical therapeutic drugs(systemic distribution and side effects).It's noted the conversion of gemcitabine(GEM)to inactive ingredients under the action of cytidine deaminase(CDA)during metabolism in vivo limits its clinical effect.A high level of reactive oxygen species(ROS)results in a high level of oxidative stress in tumor cells,which changes the expression of CDA and optimizes the metabolism of GEM in vivo and overcome drug resistance.In this study,the ROS responsive and ROS self-supplied prodrug of artemisia(ART)-thioacetal bond(TK)-GEM was synthesized and self-vectors based on ART-TK-GEM(TK@FA NPs)was prepared by using nano precipitation.ROS responsive characteristics ensure specific release of prodrugs in tumor cells with high level of ROS thereby reducing side effects on normal cells and tissues.The endogenous ROS and newly generated ROS by ART can reduce the expression of CDA and optimizes the metabolism of GEM,and the accumulated ROS can also induce apoptosis of tumor cells,realizing synergistic anti-tumor effect of chemical drugs and traditional Chinese medicines.This paper proposes a simple method by using clinically approved drugs to improve the insufficient effect of existing chemotherapy and overcome resistance,which has potential to appropriately shorten the drug development cycle and accelerate the clinical investigation of drugs.

关键词： ROS self-supplied ROS-responsive Self-delivery carrier Down regulation of CDA Synergistic anti-tumor effect Cervical cancer

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