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| 1 | Reconfigurable intelligent surfaces for smart wireless environments:channel estimation,system design and applications in 6G networks显示文摘Reconfigurable intelligent surface(RIS),one of the key enablers for the sixth-generation(6G)mobile communication networks,is considered by designers to smartly reconfigure the wireless propagation environment in a controllable and programmable manner.Specifically,an RIS consists of a large number of low-cost and passive reflective elements(REs)without radio frequency chains.The system gain of RIS wireless systems can be achieved by adjusting the phase shifts and amplitudes of the REs so that the desired signals can be added constructively at the receiver.However,an RIS typically has limited signal processing capability and cannot perform active transmitting/receiving in general,which leads to new challenges in the physical layer design of RIS wireless systems.In this paper,we provide an overview of the RIS-aided wireless systems,including the reflection principle,channel estimation,and system design.In particular,two types of emerging RIS systems are considered:RIS-aided wireless communications(RAWC)and RISbased information transmission(RBIT),where the RIS plays the role of the reflector and the transmitter,respectively.We also envision the potential applications of RIS in 6G networks. | Ying-Chang LIANG Jie CHEN Ruizhe LONG Zhen-Qing HE Xianqi LIN Chenlu HUANG Shilin LIU Xuemin(Sherman)SHEN Marco DI RENZO | 2021 | Science China(Information Sciences)2021，64，10： | 12 |
| 2 | Naphthalene diimide based near-infrared luminogens with aggregation-induced emission characteristics for biological imaging and high mobility ambipolar transistors显示文摘Organic conjugated materials combining high conductivity with strong solid-state emission are highly desired for organic electronic applications,yet still rather rare.Herein,a novel luminogen(TEN)comprised by linking naphthalene diimides and triphenyl ethylene with vinyl bridges is reported.TEN exhibits aggregation-induced emission(AIE)behavior of a strong nearinfrared fluorescence over 700 nm and the efficiency above 60.5%in the solid state,while also shows promising application in vivo bio-imaging with good permeability and extremely low background.Single crystal of TEN reveals intra-and intermolecular C–H…O hydrogen bonds,contributing to an inclined molecular stacking along the a-axis of the cell,creating a 1 D charge carrier transporting channel under a shortπ-πinteraction distance of 3.42?,which might benefit the solid emission and charge transport ability simultaneously.Solution processed bottom contact,top gate organic field effect transistors based on TEN reveal a high ambipolar charge transport ability with the hole mobility up to 0.13 cm2 V-1 s-1 and electron mobility up to0.010 cm2 V-1 s-1.Further atomic force microscopy and X-ray diffraction analysis on TEN thin film confirm the existence of the1 Dπ-πstacking channel,suggesting the stacking geometry revealed in crystal crucial for facilitating high charge carrier mobility while preserving the strong solid emission at the same time. | De Guo Lin Li Xianqi Zhu Martin Heeney Jing Li Lichun Dong Qingsong Yu Zhihua Gan Xinggui Gu Luxi Tan | 2020 | Science China Chemistry2020，63，9： | 1 |
| 3 | Controlling electromagnetic waves using tunable gradient dielectric metamaterial lens显示文摘 | Lin Xianqi Cui Tiejun Chin J Y | 2008 | ApplPhys Lett2008，92，13： | 1 |
| 4 | Design and analysis of super-wide bandpass filters using a novel compact meta-structure显示文摘 | Lin Xianqi Ma Huifeng Bao Di | 2007 | IEEE Transactions on Microwave Theory and Techniques2007，55，4： | 1 |
| 5 | Genome degradation promotes Salmonella pathoadaptation by remodeling fimbriae-mediated proinflammatory response显示文摘Understanding changes in pathogen behavior(e.g.increased virulence,a shift in transmission channel)is critical for the public health management of emerging infectious diseases.Genome degradation via gene depletion or inactivation is recognized as a pathoadaptive feature of the pathogen evolving with the host.However,little is known about the exact role of genome degradation in affecting pathogenic behavior,and the underlying molecular detail has yet to be examined.Using large-scale global avian-restricted Salmonella genomes spanning more than a century,we projected the genetic diversity of Salmonella Pullorum(bvSP)by showing increasingly antimicrobial-resistant ST92 prevalent in Chinese flocks.The phylogenomic analysis identified three lineages in bvSP,with an enhancement of virulence in the two recently emerged lineages(L2/L3),as evidenced in chicken and embryo infection assays.Notably,the ancestor L1 lineage resembles the Salmonella serovars with higher metabolic flexibilities and more robust environmental tolerance,indicating stepwise evolutionary trajectories towards avian-restricted lineages.Pan-genome analysis pinpointed fimbrial degradation from a virulent lineage.The later engineeredfim-deletion mutant,and all other five fimbrial systems,revealed behavior switching that restricted horizontal fecal-oral transmission but boosted virulence in chicks.By depleting fimbrial appendages,bvSP established persistent replication with less proinflammation in chick macrophages and adopted vertical transovarial transmission,accompanied by ever-increasing intensification in the poultry industry.Together,we uncovered a previously unseen paradigm for remodeling bacterial surface appendages that supplements virulence-enhanced evolution with increased vertical transmission. | Xiao Zhou Xiamei Kang Jiaqi Chen Yan Song Chenghao Jia Lin Teng Yanting Tang Zhijie Jiang Xianqi Peng Xiaoxi Tao Yiwei Xu Linlin Huang Xuebin Xu Yaohui Xu Tengfei Zhang Shenye Yu Jiansen Gong Shaohui Wang Yuqing Liu Guoqiang Zhu Corinna Kehrenberg Franois-Xavier Weill Paul Barrow Yan Li Guoping Zhao Min Yue | 2023 | National Science Review2023，10，10： | 0 |
| 6 | Preliminary Species Identification of Parasitic Nematodes from Rhizosphere Soil of Grapes in Mengzi City显示文摘The grape cultivation area in Luolongzhuang of Wenlan,Yingfang,Liucun and Shiqicun of Caoba in Mengzi City,Yunnan Province were surveyed from October 2014 to February 2015. Using five-point sampling method,approximately 2 kg of rhizosphere soil were collected from plants with weak growth and brown and wilting root,and 28 soil samples in total were collected. Through morphological identification,the species of parasitic nematodes in rhizosphere soil of grapes were preliminarily identified. There were three genera and four species of parasitic nematodes in grape,including A. avenae( Aphelenchus avenae Bastian,1865),R. reniformis( Rotylenchulus reniformis Linford et Oliverira,1940),H. dihytera [Helicotylenchus dihytera Sher Cobb,1893,1961] and H. pseudorobustus [Helicotylenchus pseudorobustus Golden( Steiner,1914),1956]. | Lin Lifei Liu Chunguo Yang Li Long Yaoyun Hu Xianqi | 2017 | Plant Diseases and Pests2017，8，2： | 0 |
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