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Encoding innumerable charge density waves of FeGe into polymorphs of LiFe_(6)Ge_(6)

Science China(Physics,Mechanics & Astronomy) 2024年第9期67卷 126-132页

作者： yilin wang School of Emerging Technology University of Science and Technology of ChinaHefei 230026China Hefei National Laboratory University of Science and Technology of ChinaHefei 230088China New Cornerstone Science Laboratory University of Science and Technology of ChinaHefei 230026China

Kagome metals exhibit rich quantum states by the intertwining of lattice,charge,orbital and spin degrees of ***,a novel charge density wave(CDW)ground state was discovered in kagome magnet FeGe and was revealed to be driven by lowering magnetic energy via large ***,based on DFTcalculations,we show that such mechanism will yield infinitely many metastable CDWs in FeGe due to different ways to arrange the Ge1-dimerization in enlarged ***,utilizing these metastable CDWs,innumerable polymorphs of kagome magnet LiFe_(6)Ge_(6) can be stabilized by filling Li atoms in the voids right above/below the dimerized Ge1-sites in the CDW *** polymorphs are very stable due to the presence of magnetic-energy-saving mechanism,in sharp contrast to the non-magnetic“166”kagome *** this way,a one-to-one mapping of the metastable CDWs of FeGe to stable polymorphs of LiFe_(6)Ge_(6) is *** one hand,the fingerprints of these metastable CDWs,i.e.,the induced in-plane atomic distortions and band gaps,are encoded into the corresponding stable polymorphs of LiFe_(6)Ge_(6),such that further study of their properties becomes *** the other hand,such innumerable polymorphs of LiFe_(6)Ge_(6) offer great degrees of freedom to explore the rich physics of magnetic kagome *** thus reveal a novel connection between the unusually abundant CDWs and structural polymorphism in magnetic kagome materials,and establish a new route to obtain structural polymorphism on top of CDW states.

关键词： kagome magnet unconventional charge density wave structural polymorphism magnetic energy saving

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Riemann-Hilbert approach and soliton solutions for the Lakshmanan-Porsezian-Daniel equation with nonzero boundary conditions

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Communications in Theoretical Physics 2024年第11期76卷 20-32页

作者： yilin wang Biao Li School of Mathematics and Statistics Ningbo UniversityNingbo 315211China

We construct the Riemann-Hilbert problem of the Lakshmanan-Porsezian-Daniel equation with nonzero boundary conditions,and use the Laurent expansion and Taylor series expansion to obtain the exact formulas of the soliton solutions in the case of a higher-order pole and multiple higher-order *** dynamic behaviors of a simple pole,a second-order pole and a simple pole plus a second-order pole are demonstrated.

关键词： Lakshmanan-Porsezian-Daniel equation Riemann-Hilbert problem nonzero boundary conditions multiple higher-order poles

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Design of high efficiency achromatic metalens with large operation bandwidth using bilayer architecture

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Opto-Electronic Advances 2021年第1期4卷 25-31页

作者： yilin wang Qingbin Fan Ting Xu National Laboratory of Solid-State Microstructures Key Laboratory of Intelligent Optical Sensing and Integration and College of Engineering and Applied SciencesNanjing UniversityNanjing 210093China Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093China

Achromatic metalens composed of arrays of subwavelength nanostructures with spatially varying geometries is attractivefor a number of optical applications. However, the limited degree of freedom in the single layer achromatic metasurfacedesign makes it difficult to simultaneously guarantee the sufficient phase dispersion and high diffraction efficiency,which restricts the achromatic bandwidth and efficiency of metalens. Here we propose and demonstrate a high efficiencyachromatic metalens with diffraction-limited focusing capability at the wavelength ranging from 1000 nm to 1700 nm. Themetalens comprises two stacked nanopillar metasurfaces, by which the required focusing phase and dispersion compensationcan be controlled independently. As a result, in addition to the large achromatic bandwidth, the averaged focusingefficiency of the bilayer metalens is higher than 64% at the near-infrared region. Our design opens up the possibilityto obtain the required phase dispersion and efficiency simultaneously, which is of great significance to design broadbandmetasurface-based optical devices.

关键词： metalens metasurface nanostructure waveguide

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Hadoop-based secure storage solution for big data in cloud computing environment

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Digital Communications and Networks 2024年第1期10卷 227-236页

作者： Shaopeng Guan Conghui Zhang yilin wang Wenqing Liu School of Information and Electronic Engineering Shandong Technology and Business UniversityYantai264003China

In order to address the problems of the single encryption algorithm,such as low encryption efficiency and unreliable metadata for static data storage of big data platforms in the cloud computing environment,we propose a Hadoop based big data secure storage ***,in order to disperse the NameNode service from a single server to multiple servers,we combine HDFS federation and HDFS high-availability mechanisms,and use the Zookeeper distributed coordination mechanism to coordinate each node to achieve dual-channel ***,we improve the ECC encryption algorithm for the encryption of ordinary data,and adopt a homomorphic encryption algorithm to encrypt data that needs to be *** accelerate the encryption,we adopt the dualthread encryption ***,the HDFS control module is designed to combine the encryption algorithm with the storage *** results show that the proposed solution solves the problem of a single point of failure of metadata,performs well in terms of metadata reliability,and can realize the fault tolerance of the *** improved encryption algorithm integrates the dual-channel storage mode,and the encryption storage efficiency improves by 27.6% on average.

关键词： Big data security Data encryption Hadoop Parallel encrypted storage Zookeeper

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Time-space transform:A novel signal processing approach for an acoustic vector-sensor

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Science China(Information Sciences) 2013年第4期56卷 135-145页

作者： LIANG GuoLong MA Wei wang yilin Key Laboratory of Underwater Acoustic Technology Harbin Engineering University

A new signal processing method using a single vector hydrophone is proposed for solving the problem of azimuth angle estimation for multiple targets based on a small aperture underwater *** method extends the aperture from a single vector hydrophone into a half wavelength distance uniform linear array by decomposing the time-domain sample data from different channels of the *** extended array has a narrower space beam pattern than a single vector *** azimuths of spatial multiple targets are estimated by using the appended array snapshots under the condition of broadband or narrow band *** new method is robust because there is no need to correct the array *** analysis and computer simulations show that,the new algorithm has the ability to distinguish two incoherent targets with either narrow band or broadband signals in an isotropic noise *** algorithm provides a non-biased estimate with a high signal-to-noise ratio.

关键词： time space transform beam forming DOA MUSIC single vector hydrophone

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Flexural Performance of Reinforced Concrete Beams Strengthened with Carbon Fiber-Reinforced Polymer(CFRP)under Hygrothermal Environment Considering the Influence of CFRP-Concrete Interface

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Acta Mechanica Solida Sinica 2021年第3期34卷 381-392页

作者： Xinyan Guo Peiyan Huang yilin wang Shenyunhao Shu Xiaohong Zheng School of Civil Engineering and Transportation South China University of TechnologyGuangzhou 510640China State Key Laboratory of Subtropical Building Science South China University of TechnologyGuangzhou 510640China

As an important component,the bond behavior of carbon fiber-reinforced polymer(CFRP)-concrete interface for a reinforced concrete(RC)beam is very *** this study,a theoretical model was established to analyze the flexural behavior of CFRP-strengthened RC beams,and the CFRP-concrete interfacial bond-slip relationship under hygrothermal environment was unified into one *** failure criteria corresponding to two types of failure modes,i.e.,concrete crushing and intermediate crack(IC)-induced debonding,were *** the theoretical model,the flexural behavior of deflection,interfacial shear stress distribution and ultimate load of a CFRP-strengthened RC beam under hygrothermal environment were obtained and ***,the theoretical model was verified by test *** results showed that the hygrothermal environment had a significant impact on the CFRP-concrete interface *** with the control beam without hygrothermal environment pretreatment,the deflection and ultimate load of the strengthened RC beam decreased by 51.9%and 20%,respectively.

关键词： Carbon fiber-reinforced polymer(CFRP) CFRP-concrete interface Hygrothermal environment Failure mode Static behavior Reinforced concrete(RC)beam

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Multiuser underwater acoustic communication using single-element virtual time reversal mirror

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Chinese Science Bulletin 2009年第8期54卷 1302-1310页

作者： YIN JingWei wang yilin wang Lei HUI JunYing National Laboratory of Underwater Acoustic Technology Harbin Engineering University Harbin 150001 China

Pattern time delay shift coding(PDS) scheme is introduced and combined with spread spectrum tech-nique called SS-PDS for short which is power-saving and competent for long-range underwater acoustic ***-element virtual time reversal mirror(VTRM) is presented in this paper and validated by the lake trial *** single-element VTRM in multiuser communication system based on SS-PDS can separate different users' information simultaneously at master node as indicated in the simulation results.

关键词：时间延迟多用户元素水声通信转镜虚拟综合布线系统 PDS系统

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Spatial distribution of laser energy and its influence on the stability of extreme narrow keyholes during ultra-high power laser welding

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Science China(Technological Sciences) 2022年第9期65卷 2079-2088页

作者： wang yilin JIANG Ping GENG ShaoNing SHU LeShi SHAO XinYu The State Key Laboratory of Digital Manufacturing Equipment and Technology School of Mechanical Science and EngineeringHuazhong University of Science&TechnologyWuhan 430074China

The instability of extremely narrow keyholes is the main challenge in high-power laser *** this work,the spatial energy distribution and its influence on the stability of extremely narrow keyholes during ultra-high power laser welding are studied.A multiphase flow model that considers the vapor plume impact and the multiple scattering of laser radiation is built to simulate the topology and downstream wave flow on the keyhole *** keyhole fluctuation is due to excessive energy accumulation,which arises from the abnormal wrinkle structures that form on the front keyhole *** the periodic cutting phenomena on the keyhole opening and the hump accumulation effect on the solid-liquid interface help smooth the keyhole *** welding processes are obtained,producing fine,closed,and evenly distributed wrinkle structures,and the keyhole stability is correspondingly *** simulation results agree well with the experiment.

关键词： ultra-high power laser welding extreme narrow keyhole spatial energy distribution keyhole stability

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Image Generation of Tomato Leaf Disease Identification Based on Small-ACGAN

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Computers, Materials & Continua 2023年第7期76卷 175-194页

作者： Huaxin Zhou Ziying Fang yilin wang Mengjun Tong School of Mathematics and Computer Science Zhejiang A&F UniversityHangzhou311300China Zhejiang Provincial Key Laboratory of Forestry Intelligent Monitoring and Information Technology Research Hangzhou311300China School of Humanities and Law Zhejiang A&F UniversityHangzhou311300China Department of Computer Science and Engineering Lehigh UniversityPA18015USA

Plant diseases have become a challenging threat in the agricultural *** learning approaches for plant disease detection and classification have been adopted to detect and diagnose these diseases ***,deep learning entails extensive data for training,and it may be challenging to collect plant *** though plant datasets can be collected,they may be uneven in *** a result,the problem of classification model overfitting *** study targets this issue and proposes an auxiliary classifier GAN(small-ACGAN)model based on a small number of datasets to extend the available ***,after comparing various attention mechanisms,this paper chose to add the lightweight Coordinate Attention(CA)to the generator module of Auxiliary Classifier GANs(ACGAN)to improve the image ***,a gradient penalty mechanism was added to the loss function to improve the training stability of the *** show that the proposed method can best improve the recognition accuracy of the classifier with the doubled *** AlexNet,the accuracy was increased by 11.2%.In addition,small-ACGAN outperformed the other three GANs used in the ***,the experimental accuracy,precision,recall,and F1 scores of the five convolutional neural network(CNN)classifiers on the enhanced dataset improved by an average of 3.74%,3.48%,3.74%,and 3.80%compared to the original ***,the accuracy of MobileNetV3 reached 97.9%,which fully demonstrated the feasibility of this *** general experimental results indicate that the method proposed in this paper provides a new dataset expansion method for effectively improving the identification accuracy and can play an essential role in expanding the dataset of the sparse number of plant diseases.

关键词： Deep learning ACGAN CA gradient penalty tomato diseases identification

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Denitrification and the controlling factors in Yunnan Plateau Lakes(China): Exploring the role of enhanced internal nitrogen cycling by algal blooms

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Journal of Environmental Sciences 2019年第2期31卷 349-358页

作者： Sifeng Wu Zhen Wu Zhongyao Liang Yong Liu yilin wang College of Environmental Sciences and Engineering Key Laboratory of Water and Sediment Sciences (MOE)Peking University College of Environmental Sciences and Engineering Key Laboratory of Water and Sediment Sciences(MOE)Peking University

Denitrification plays an important role in nitrogen(N) removal in freshwater *** internal process regulates the fluctuations of N concentration, especially for lakes with high nutrients concentrations and long residence time. Lakes in Yunnan plateau(southwestern China) provide typical cases, while studies in this region have been ***, we studied denitrification of two lakes(Lake Dianchi in hypereutrophic state and Lake Erhai in mesotrophic) in this region. We used acetylene inhibition technique to quantify potential denitrification rate(PDR) of these lakes in April and August, 2015 and 2016. PDR of the sediments ranged 0–1.21 μmol/(N·m^2·hr), and that of overlying water ranged 0–0.24 μmol/(N·L·hr). Then, we used Least Angle Regression to determine the controlling factors for denitrification. Nutrients controlled PDR from two aspects: providing essential nitrogen sources; and affecting the richness and metabolism of denitrifying bacteria. In April, both aspects limited PDR; while only nitrogen sources limited PDR in August, due to depleted nitrate and enhanced denitrifying bacteria activity. Ammonia was most significant to denitrification, indicating that nitrate from nitrification transported to the bottom of wellmixed lake provide major N source by denitrification. The high PDR and low nitrate concentrate in August were evidence of an enhanced internal N cycling by algal blooms.

关键词： Denitrification Controlling factors Lake Dianchi Lake Erhai Algal bloom Internal cycling

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