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One-year anniversary:The progress of Microsystems & Nanoengineering

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Microsystems & Nanoengineering 2016年第1期2卷 152-153页

作者： yirong wu Ian White Tianhong Cui Editor-in-Chief Microsystems & Nanoengineering Academician of Chinese Academy of Sciences and Director of Institute of Electronics Chinese Academy of Sciences Beijing China Executive Editor-in-Chief Microsystems & Nanoengineering Fellow of Royal Academy of Engineering and Professor University of Cambridge Cambridge UK Professor University of Minnesota 111 Church Street S.E. Minneapolis MN 55455 USA

With time passing imperceptibly,Microsystems&Nanoengineering has indeed attracted the attention of its international peers in MEMS and nanotechnology since it was launched as a new journal on May 28,***&Nanoengineering is the first engineering journal co-published by the Nature Publishing Group(NPG)and the Institute of Electronics of Chinese Academy of Sciences(IECAS).On behalf of the editorial board of Microsystems&Nanoengineering,we would like to express our deep gratitude to our readers,authors,and *** sincerely thank all of you for your strong and consistent support!

关键词： journal behalf thank

Molecular Simulation of Transesterification of Ethylene Carbonate and Methanol Catalyzed by Ionic Liquids

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China Petroleum Processing & Petrochemical Technology 2019年第4期21卷 73-80页

作者： Guo Liying wu Hao Wang yirong Cui Zhongyi Chen Yanming School of Petrochemical Engineering Shenyang University of Technology

Four ionic liquids [BMIM]OH, [BMIM]IM, [BMIM]Br, and [BMIM]PF6 were synthesized and characterized by infrared spectroscopy. Then the effects of ionic liquids(ILs), cocatalysts, and reaction temperature on the catalytic performance for transesterification of ethylene carbonate and methanol were investigated with orthogonal experiments. The influence of cations and anions of ILs on catalytic activity was revealed by the density functional theory(DFT). The reaction mechanism was proposed based on the experimental results and DFT. The results demonstrated that the optimal catalyst was [Bmim]PF6/CaO, which exhibited the advantages of high activity, excellent stability, and easy recycling. Under the optimized conditions covering a catalytic temperature of 130 °C, an ionic liquid/cocatalyst mass ratio of 5:1, and a catalyst dosage of 4.0%, the conversion rate could reach 65.23% with a dimethyl carbonate selectivity of 98.95%. No significant loss of catalyst activity was detected after 7 recycle times.

关键词： ionic liquids catalyst transesterification molecular simulation

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IMAGING AND MTI PROCESSING BASED ON DUAL-FREQUENCIES DUAL-APERTURES SPACEBORNE SAR

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Journal of Electronics(China) 2009年第1期26卷 38-44页

作者： Yin Jianfeng Li Daojing wu yirong National Key Laboratory of Microwave Imaging Technology Institute of Electronics Chinese Academy of Sciences Beijing 100190 China Graduate University of Chinese Academy of Sciences Beijing 100190 China

Based on dual-frequencies dual-apertures spaceborne SAR （Synthetic Aperture Radar）, a new SAR system with four receiving channels and two operation modes is presented in this paper, SAR imaging and Moving Target Indication （MTI） are studied in this system. High resolution imaging with wide swath is implemented by the Mode Ⅰ, and MTI is completed by the Mode Ⅱ. High azimuth resolution is achieved by the Displaced Phase Center （DPC） multibeam technique. And the Coherent Accumulation （CA） method, which combines dual channels data of different carrier frequency, is used to enhance the range resolution. For the data of different carrier frequency, the two aperture interferometric processing is executed to implement clutter cancellation, respectively. And the couple of clutter suppressed data are employed to implement Dual Carrier Frequency Conjugate Processing （DCFCP）, then both slow and fast moving targets detection can be completed, followed by moving target imaging. The simulation results show the validity of the signal processing method of this new SAR system.

关键词： Spaceborne Synthetic Aperture Radar (SAR) Dual-frequencies dual-apertures Enhancing range resolution Slow and fast moving target detection Moving target imaging

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A novel sparse SAR unambiguous imaging method based on mixed-norm optimization

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Science China(Information Sciences) 2023年第11期66卷 307-308页

作者： Hui BI Yufan SONG Yanjie YIN Jingjing 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 Aerospace Information Research Institute Chinese Academy of Sciences

Sparse synthetic aperture radar(SAR) systems always obtain a wide swath by reducing the pulse repetition frequency(PRF). However, the reduction of PRF will cause azimuth ambiguity, and even lead to failed reconstruction of the observation scenes in SAR imaging because traditional sparse SAR imaging models do not consider the azimuth ambiguity terms and cannot effectively suppress ambiguity.

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Joint SAR imaging and wireless communication using the FBMC chirp waveform

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Science China(Information Sciences) 2020年第4期63卷 236-238页

作者： Kehong ZHU Jie WANG Xingdong LIANG Longyong CHEN Yanlei LI Xiangxi BU yirong wu Institute of Electronics Chinese Academy of Sciences National Key Laboratory of Science and Technology on Microwave Imaging College of Electronic and Information Engineering Nanjing University of Information Science & Technology

Dear editor,Joint system designs help improve resource efficiency and reduce the volume and energy consumption of electronic systems; therefore, such joint systems have become a research hot spot in recent years [1, 2]. To improve the flexibility of the working modes and to enhance adaptability to complex applications, joint synthetic aper-

关键词： domain Doppler Joint SAR imaging and wireless communication using the FBMC chirp waveform SAR

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

A multicomponent micro-Doppler signal decomposition and parameter estimation method for target recognition

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Science China(Information Sciences) 2019年第2期62卷 230-232页

作者： Chen SONG yirong wu Liangjiang ZHOU Ruoming LI Jiefang YANG Wei LIANG Chibiao DING National Key Laboratory of Microwave Imaging Technology Institute of Electronics Chinese Academy of Sciences University of Chinese Academy of Sciences

Dear editor,The micro-Doppler modulation caused by the rotors on an unmanned aerial vehicle (UAV) can be employed to recognize the UAV. However, several rotors on a UAV, as well as multiple targets at the same scene, lead to a multicomponent microDoppler signal in the radar echo. Conventional signal decomposition is an important method for extraction of the features from micro-Doppler signals [1], although it is incapable of separating characteristic curves that are overlapping [2]in the time-frequency (TF) plane in the case of multicomponent micro-motion, which can lead to

关键词： UAV Pi PTF

Recent advances and research progress on microsystems and bioeffects of terahertz neuromodulation

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Microsystems & Nanoengineering 2023年第6期9卷 25-41页

作者： Meiting Liu Juntao Liu Wei Liang Botao Lu Penghui Fan Yilin Song Mixia Wang yirong wu Xinxia Cai State Key Laboratory of Transducer Technology Aerospace Information Research InstituteChinese Academy of SciencesBeijing100190China School of Electronic Electrical and Communication EngineeringUniversity of Chinese Academy of SciencesBeijing100049China

Terahertz waves can interact with the nervous system of organisms under certain *** to common optical modulation methods,terahertz waves have the advantages of low photon energy and low risk;therefore,the use of terahertz waves to regulate the nervous system is a promising new method of ***,most of the research has focused on the use of terahertz technology for biodetection,while relatively little research has been carried out on the biological effects of terahertz radiation on the nervous system,and there are almost no review papers on this *** the present article,we begin by reviewing principles and objects of research regarding the biological effects of terahertz radiation and summarizing the current state of related research from a variety of aspects,including the bioeffects of terahertz radiation on neurons in vivo and in vitro,novel regulation and detection methods with terahertz radiation devices and neural microelectrode arrays,and theoretical simulations of neural information encoding and *** addition,we discuss the main problems and their possible causes and give some recommendations on possible future *** paper will provide insight and assistance to researchers in the fields of neuroscience,terahertz technology and biomedicine.

关键词： breakthrough neural microelectrode

On the origin and continuing evolution of SARS-CoV-2

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National Science Review 2020年第6期7卷 1012-1023页

作者： Xiaolu Tang Changcheng wu Xiang Li Yuhe Song Xinmin Yao Xinkai wu Yuange Duan Hong Zhang yirong Wang Zhaohui Qian Jie Cui Jian Lu State Key Laboratory of Protein and Plant Gene Research Center for Bioinformatics School of Life Sciences Peking University CAS Key Laboratory of Molecular Virology & Immunology Institut Pasteur of Shanghai Chinese Academy of Sciences Center for Biosafety Mega-Science Chinese Academy of Sciences University of Chinese Academy of Sciences School of Life Sciences Shanghai University NHC Key Laboratory of Systems Biology of Pathogens Institute of Pathogen Biology Chinese Academy of Medical Sciences and Peking Union Medical College

The SARS-Co V-2 epidemic started in late December 2019 in wuhan, China, and has since impacted a large portion of China and raised major global concern. Herein, we investigated the extent of molecular divergence between SARS-CoV-2 and other related coronaviruses. Although we found only 4% variability in genomic nucleotides between SARS-CoV-2 and a bat SARS-related coronavirus(SARSr-CoV;Ra TG13), the difference at neutral sites was 17%, suggesting the divergence between the two viruses is much larger than previously estimated. Our results suggest that the development of new variations in functional sites in the receptor-binding domain(RBD) of the spike seen in SARS-Co V-2 and viruses from pangolin SARSr-Co Vs are likely caused by natural selection besides recombination. Population genetic analyses of 103 SARS-CoV-2 genomes indicated that these viruses had two major lineages(designated L and S), that are well defined by two different SNPs that show nearly complete linkage across the viral strains sequenced to date. We found that L lineage was more prevalent than the S lineage within the limited patient samples we examined. The implication of these evolutionary changes on disease etiology remains *** findings strongly underscores the urgent need for further comprehensive studies that combine viral genomic data, with epidemiological studies of coronavirus disease 2019(COVID-19).

关键词： SARS-CoV-2 virus molecular evolution population genetics