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Defects‑Rich Heterostructures Trigger Strong Polarization Coupling in Sulfides/Carbon Composites with Robust Electromagnetic Wave Absorption

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Nano-Micro Letters 2025年第1期17卷 528-547页

作者： Jiaolong liu Siyu Zhang Dan Qu Xuejiao Zhou Moxuan Yin Chenxuan Wang Xuelin Zhang Sichen li Peijun Zhang Yuqi Zhou Kai Tao mengyang li Bing Wei Hongjing Wu mengyang li Bing Wei Hongjing Wu School of Physics Xidian UniversityXi’an 710071People’s Republic of China School of Advanced Materials and Nanotechnology State Key Discipline Laboratory of Wide Band Gap Semiconductor TechnologyXidian UniversityXi’an 710071People’s Republic of China School of Microelectronics Xidian UniversityXi’an 710071People’s Republic of China School of Telecommunication Engineering Xidian UniversityXi’an 710071People’s Republic of China MOE Key Laboratory of Material Physics and Chemistry Under Extraordinary School of Physical Science and TechnologyNorthwestern Polytechnical UniversityXi’an 710072People’s Republic of China The Ministry of Education Key Laboratory of Micro and Nano Systems forAerospace School of Mechanical EngineeringNorthwestern PolytechnicalUniversityXi’an 710072People’s Republic of China

Defects-rich heterointerfaces integrated with adjustable crystalline phases and atom vacancies,as well as veiled dielectric-responsive character,are instrumental in electromagnetic *** methods,however,constrain their delicate ***,an innovative alternative is proposed:carrageenan-assistant cations-regulated(CACR)strategy,which induces a series of sulfides nanoparticles rooted in situ on the surface of carbon *** unique configuration originates from strategic vacancy formation energy of sulfides and strong sulfides-carbon support interaction,benefiting the delicate construction of defects-rich heterostructures in M_(x)S_(y)/carbon composites(M-CAs).Impressively,these generated sulfur vacancies are firstly found to strengthen electron accumulation/consumption ability at heterointerfaces and,simultaneously,induct local asymmetry of electronic structure to evoke large dipole moment,ultimately leading to polarization coupling,i.e.,defect-type interfacial ***“Janus effect”(Janus effect means versatility,as in the Greek two-headed Janus)of interfacial sulfur vacancies is intuitively confirmed by both theoretical and experimental investigations for the first ***,the sulfur vacancies-rich heterostructured Co/Ni-CAs displays broad absorption bandwidth of 6.76 GHz at only 1.8 mm,compared to sulfur vacancies-free CAs without any dielectric *** defects-rich heterostructures,this one-pot CACR strategy may steer the design and development of advanced nanomaterials,boosting functionality across diverse application domains beyond electromagnetic response.

关键词： Defects-rich heterointerfaces Sulfides Polarization coupling Electromagnetic wave absorption

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Electrosynthesis of ^(15)N-labeled amino acids from ^(15)N-nitrite and ketonic acids

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Science China Chemistry 2023年第6期66卷 1854-1859页

作者： Yongmeng Wu mengyang li Tieliang li Jinghui Zhao Ziyang Song Bin Zhang Department of Chemistry School of ScienceInstitute of Molecular PlusTianjin UniversityTianjin 300072China Tianjin Key Laboratory of Molecular Optoelectronic Science Key Laboratory of Systems Bioengineering(Ministry of Education)Tianjin UniversityTianjin 300072China

^(15)N isotope-labeled amino acids(^(15)N-amino acids)are crucial in the fields of biology,medicine,and chemistry.^(15)N-amino acids are conventionally synthesized through microbial fermentation and chemical reductive amination of ketonic acids methodologies,which usually require complicated procedures,high temperatures,or toxic cyanide usage,causing energy and environmental ***,we report a sustainable pathway to synthesize ^(15)N-amino acids from readily available ^(15)N-nitrite(^(15)NO_(2)-)and biomass-derived ketonic acids under ambient conditions driven by renewable electricity.A mechanistic study demonstrates a ^(15)N-nitrite→^(15)NH_(2)OH→^(15)N-pyruvate oxime→^(15)N-alanine reaction pathway for ^(15)N-alanine ***,this electrochemical strategy can synthesize six ^(15)N-amino acids with 68%–95%***,a ^(15)N-labeled drug of ^(15)N-tiopronin,the most commonly used hepatitis treatment drug,is fabricated using ^(15)N-glycine as the building ***,^(15)N sources can be recycled by the electrooxidation of ^(15)NH4^(+) to ^(15)NO_(2)-with a method *** work opens an avenue for the green synthesis of ^(15)N-labeled compounds or drugs.

关键词： green synthesis ^(15)N-labeled amino acids electrosynthesis C-N bond isotope labeling

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Combinatorial optimization of perovskite-based ferroelectric ceramics for energy storage applications

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Journal of Advanced Ceramics 2024年第7期13卷 877-910页

作者： Suwei Dai mengyang li Xiaowen Wu Yunyi Wu Xiang li Yanan Hao Bingcheng Luo Engineering Research Center of Ministry of Education for Geological Carbon Storage and Low Carbon Utilization of Resources Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid WastesNational Laboratory of Mineral MaterialsSchool of Materials Science and TechnologyChina University of Geosciences BeijingBeijing 100083China College of Science China Agricultural UniversityBeijing 100083China Research Center for Comprehensive Energy Technology CTG Science and Technology Research InstituteBeijing 100038China School of Energy and Power Engineering Beihang UniversityBeijing 100191China State Key Laboratory of Information Photonics and Optical Communications&School of Science Beijing University of Posts and TelecommunicationsBeijing 100876China

With the increasing impacts of climate change and resource depletion,dielectric capacitors,with their exceptional stability,fast charging and discharging rates,and ability to operate under more extreme conditions,are emerging as promising high-demand candidates for high-performance energy storage devices,distinguishing them from traditional electrochemical capacitors and ***,due to the shortcomings of various dielectric ceramics(e.g.,paraelectrics(PEs),ferroelectrics(FEs),and antiferroelectrics(AFEs)),their low polarizability,low breakdown strength(BDS),and large hysteresis loss limit their standalone use in the advancement of energy storage ***,synthesizing novel perovskite-based materials that exhibit high energy density,high energy efficiency,and low loss is crucial for achieving superior energy storage *** this review,we outline the recent development of perovskitebased ferroelectric energy storage ceramics from the perspective of combinatorial optimization for tailoring ferroelectric hysteresis loops and comprehensively discuss the properties arising from the different combinations of *** also provide future guidelines in this ***,the combinatorial optimization strategy in this review will open up a practical route toward the application of new high-performance ferroelectric energy storage devices.

关键词： perovskite hysteresis loop relaxor ferroelectric(RFE) paraelectric(PE) antiferroelectric(AFE) energy storage

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A Novel DDoS Attack Detection Method Using Optimized Generalized Multiple Kernel Learning

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Computers, Materials & Continua 2020年第3期62卷 1423-1443页

作者： Jieren Cheng Junqi li Xiangyan Tang Victor SSheng Chen Zhang mengyang li Key Laboratory of Internet Information Retrieval of Hainan Province Hainan UniversityHaikouChina College of Information Science&Technology Hainan UniversityHaikouChina Department of Computer Science University of Central ArkansasConwayAR 72035USA

Distributed Denial of Service(DDoS)attack has become one of the most destructive network attacks which can pose a mortal threat to Internet *** detection methods cannot effectively detect early *** this paper,we propose a detection method of DDoS attacks based on generalized multiple kernel learning(GMKL)combining with the constructed parameter *** super-fusion feature value(SFV)and comprehensive degree of feature(CDF)are defined to describe the characteristic of attack flow and normal flow.A method for calculating R based on SFV and CDF is proposed to select the combination of kernel function and regularization paradigm.A DDoS attack detection classifier is generated by using the trained GMKL model with R *** experimental results show that kernel function and regularization parameter selection method based on R parameter reduce the randomness of parameter selection and the error of model detection,and the proposed method can effectively detect DDoS attacks in complex environments with higher detection rate and lower error rate.

关键词： DDoS attack detection GMKL parameter optimization

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DDoS Attack Detection via Multi-Scale Convolutional Neural Network

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Computers, Materials & Continua 2020年第3期62卷 1317-1333页

作者： Jieren Cheng Yifu liu Xiangyan Tang Victor SSheng mengyang li Junqi li School of Information Science and Technology Hainan University570228HaikouChina State Key Laboratory of Marine Resource Utilization in South China Sea 570228HaikouChina Department of Computer Science University of Central ArkansasConwayAR 72035USA

Distributed Denial-of-Service(DDoS)has caused great damage to the network in the big data *** methods are characterized by low computational efficiency,high false alarm rate and high false alarm *** this paper,we propose a DDoS attack detection method based on network flow grayscale matrix feature via multi-scale convolutional neural network(CNN).According to the different characteristics of the attack flow and the normal flow in the IP protocol,the seven-tuple is defined to describe the network flow characteristics and converted into a grayscale feature by *** on the network flow grayscale matrix feature(GMF),the convolution kernel of different spatial scales is used to improve the accuracy of feature segmentation,global features and local features of the network flow are extracted.A DDoS attack classifier based on multi-scale convolution neural network is *** show that compared with correlation methods,this method can improve the robustness of the classifier,reduce the false alarm rate and the missing alarm rate.

关键词： DDoS attack detection convolutional neural network network flow feature extraction

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Dual-site fluorescent probe for highly selective and sensitive detection of sulfite and biothiols

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Chinese Chemical Letters 2018年第6期29卷 992-994页

作者： mengyang li Pengcheng Cui Kun li Jiahui Feng Mingming Zou Xiaoqi Yu Key Laboratory of Green Chemistry and Technology Ministry of Education College of Chemistry Sichuan University

A dual-site fluorescent probe with double bond and aldehyde as reactive sites, was designed for the selective detection of sulfite and biothiols. Sulfite reacts with conjugate bond selectively, while Cys responses with aldehyde and GSH occurs substitution reaction. Different interactions cause different absorption and fluorescence responses. Moreover, it could be further applied in imaging in living cells.

关键词： Dual-site Fluorescent probe Sulfite Biothiols Cell imaging

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Reversible N6-methyladenosine of RNA:The regulatory mechanisms on gene expression and implications in physiology and pathology

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Genes & Diseases 2020年第4期7卷 585-597页

作者： Xinyu Fang mengyang li Tao Yu Gaoli liu Jianxun Wang School of Basic Medicine Qingdao UniversityQingdao 266071China Institute for Translational Medicine Qingdao UniversityQingdao 266021China Department of Cardiovascular Surgery Affiliated HospitalQingdao UniversityQingdao 266510China

N6-methyladenosine(m6A)is the most abundant inner RNA modification in *** to the development of RNA sequencing technology,the distribution pattern of m6A in the transcriptome has been ***,the reversible N6-methylation is mediated by two types of proteins,which are classified as“writers”and“erasers”.Under the association of specific co-factors,writers show spatiotemporal N6-methyltransferase ***,m6A can be recognized by“reader”proteins or can directly modify RNA conformation,and it widely affects gene expression by mediating RNA stability,translation,splicing and export.m6A is involved in a series of physiology *** of m6A is gradually defined as the pathogenesis of some diseases,e.g.,cancer and cardiovascular ***,a good understanding of m6A is essential for molecular biology and pathology *** this article we systemically present an overview of the functions and mechanisms of identified m6A *** discovered biological and pathological processes affected by m6A are also *** hope that readers with related research interests benefit from our review.

关键词： Diseases Epigenetics Gene expression m6A m6A regulator RNA

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A DDoS Attack Information Fusion Method Based on CNN for Multi-Element Data

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Computers, Materials & Continua 2020年第4期63卷 131-150页

作者： Jieren Cheng Canting Cai Xiangyan Tang Victor SSheng Wei Guo mengyang li School of Information Science and Technology Hainan UniversityHaikou570228China Key Laboratory of Internet Information Retrieval of Hainan Province Hainan UniversityHaikou570228China Department of Computer Science University of Central ArkansasConwayAR 72035US

Traditional distributed denial of service(DDoS)detection methods need a lot of computing resource,and many of them which are based on single element have high missing rate and false alarm *** order to solve the problems,this paper proposes a DDoS attack information fusion method based on CNN for multi-element ***,according to the distribution,concentration and high traffic abruptness of DDoS attacks,this paper defines six features which are respectively obtained from the elements of source IP address,destination IP address,source port,destination port,packet size and the number of IP ***,we propose feature weight calculation algorithm based on principal component analysis to measure the importance of different features in different network *** algorithm of weighted multi-element feature fusion proposed in this paper is used to fuse different features,and obtain multi-element fusion feature(MEFF)***,the DDoS attack information fusion classification model is established by using convolutional neural network and support vector machine respectively based on the MEFF time *** results show that the information fusion method proposed can effectively fuse multi-element data,reduce the missing rate and total error rate,memory resource consumption,running time,and improve the detection rate.

关键词： DDoS attack multi-element data information fusion principal component analysis CNN

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SUB-NATURAL liNEWIDTH OPTICAL-PUMPING DIPS IN A HOMOGENEOUSLY BROADENED SPECTRAL liNE

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Chinese Physics Letters 1987年第1期4卷 21-24页

作者： li mengyang FU Jishi Department of Radio-Electronics Peking UniversityBeijing

Sub-natural linewidth optical-pumping dips have been observed in a homogeneously broadened. fluorescence line in Na atomic beam spectroscopy. To our knowledge, this is the first observation of sub-natural linewidth di... 详细信息

关键词： pumping spectroscopy. optical

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Velocity structure and radial anisotropy beneath the northeastern Tibetan Plateau revealed by eikonal equation-based teleseismic P-wave traveltime tomography

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Science China Earth Sciences 2022年第5期65卷 824-844页

作者： mengyang li Shaolin liU Dinghui YANG Xiwei XU Wenhao SHEN Chaodi XIE Wenshuai WANG Shuxin YANG National Institute of Natural Hazards Ministry of Emergency Management of ChinaBeijing 100085China School of Earth Sciences Yunnan UniversityKunming 650091China Department of Mathematical Sciences Tsinghua UniversityBeijing 100084China School of Mathematics and Statistics Ningxia UniversityYinchuan 750021China

The northeastern Tibetan Plateau serves as the frontier for the northeastward expansion of the *** this area,the Tibetan Plateau interacts with the surrounding blocks,such as the Alxa Block,the Ordos Block,the Kunlun-West Qinling belt and the Sichuan *** of this expansion and interaction,this area suffers from intense *** present,the evolution and deformation mechanisms of the northeastern Tibetan Plateau remain *** provide new insights into these mechanisms,in this study,we conduct tomography of the P-wave velocity and radial anisotropy structures beneath the northeastern Tibetan *** choose a total of 667 teleseismic earthquakes from August 2006 to October *** of these earthquakes were recorded by 921 broadband seismic stations in the northeastern Tibetan Plateau and surrounding *** first perform cross-correlation on waveforms of each station pair and obtain 770,749 P-wave traveltime ***,we invert the differential traveltime data by applying eikonal equation-based teleseismic ***,the P-wave velocity and radial anisotropy structures at depths from 30 to 800 km below the northeastern Tibetan Plateau are *** tomographic model shows clear low-velocity anomalies and positive radial anisotropy in the lower crust under the northeastern Qilian orogen,the northeastern Songpan-Ganzi belt and the western Qinling fold *** features are integrated to demonstrate the existence of lower crustal flow in the study *** low-velocity anomalies and positive radial anisotropy are found in the uppermost mantle beneath the Qilian orogen,the northeastern Songpan-Ganzi belt and western Qinling fold *** characteristics are combined to infer a weak lithosphere and horizontal asthenospheric flow under these tectonic *** the Ordos Block and the Sichuan Basin exhibit clear high-velocity anomalies and negative radial anisotropy in the uppermost mantle,thereby reflect

关键词： Northeastern Tibetan Plateau Tomography P-wave velocity Radial anisotropy structure Indian plate

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