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Science China Chemistry 2023年第5期66卷 1435-1442页

作者： Yuqian Sun Xinxin Wu Zhu Cao Chen Zhu Key Laboratory of Organic Synthesis of Jiangsu Province College of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China Frontiers Science center for Transformative Molecules and Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs Shanghai Jiao Tong UniversityShanghai 200240China

A conceptually novel,trifunctional sulfoximine-mediatedγ-functionalization of unactivated C(sp^(3))–H bonds has been *** reaction is initiated by the photo-induced homolytic cleavage of an N–S bond in the absence of photosensitizer,and proceeds sequentially through a cascade of 1,5-hydrogen atom transfer,1,4-functional group migration,desulfoximination and a Minisci reaction.A major feature of this approach is the use of sulfoximine as a traceless directing *** positive properties include mild conditions,simple operation,exclusive site-selectivity,high product diversity and the avoidance of additional *** protocol provides a new reaction mode for HAT-induced C(sp^(3))–H functionalization,and allows a much broader chemical space for sulfoximine studies.

关键词： sulfoximine hydrogen atom transfer functional group migration C(sp^(3))–H functionalization heteroarylation photochemistry

Silicon/2D-material photodetectors: from nearinfrared to mid-infrared

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Light(Science & Applications) 2021年第7期10卷 1164-1184页

作者： Chaoyue Liu Jingshu Guo Laiwen Yu Jiang Li Ming Zhang Huan Li Yaocheng Shi Daoxin Dai State Key Laboratory for Modern Optical Instrumentation Zhejiang Provincial Key Laboratory for Sensing TechnologiesCollege of Optical Science and EngineeringInternational Research Center for Advanced PhotonicsZhejiang UniversityZijingang CampusHangzhou 310058China Ningbo Research Institute Zhejiang UniversityNingbo 315100China

Two-dimensional materials(2DMs)have been used widely in constructing photodetectors(PDs)because of their advantages in flexible integration and ultrabroad operation wavelength ***,2DM PDs on silicon have attracted much attention because silicon microelectronics and silicon photonics have been developed successfully for many applications.2DM PDs meet the imperious demand of silicon photonics on low-cost,high-performance,and broadband *** this work,a review is given for the recent progresses of Si/2DM PDs working in the wavelength band from near-infrared to mid-infrared,which are attractive for many *** operation mechanisms and the device configurations are summarized in the first *** waveguide-integrated PDs and the surface-illuminated PDs are then reviewed in details,*** discussion and outlook for 2DM PDs on silicon are finally given.

关键词： waveguide attractive details

A Novel Multiparty Quantum Secret Sharing Scheme of Secure Direct communication Based on Bell States and Bell Measurements

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Chinese Physics Letters 2011年第5期28卷 22-25页

作者： SHI Run-Hua HUANG Liu-Sheng YANG Wei ZHONG Hong National High Performance Computing center at Hefei Department of Computer Science and TechnologyUniversity of Science and Technology of ChinaHefei 230027 School of Computer Science and Technology Anhui UniversityHefei 230039 Suzhou Institute for Advanced Study University of Science and Technology of ChinaSuzhou 215123

We present a novel quantum secret sharing scheme of secure direct communication and analyze its *** scheme takes Einstein-Podolsky-Rosen(EPR)pairs in Bell states as quantum *** order to obtain thedirect communication message,all agents only need to perform Bell measurements,not to perform any local unitary *** total efficiency in this scheme approaches 100%as the classical information exchanged is unnecessary except for the eavesdropping checks.

关键词： scheme quantum unitary

Hydrodynamic improvement of a goose-head pattern braided reach in lower Yangtze River

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Journal of Hydrodynamics 2019年第3期31卷 614-621页

作者： Wen-hong Dai Wei Ding State Key Laboratory of Hydrology- Water Resources and Hydraulic Engineering Nanjing 210098 China College of Water Conservancy and Hydropower Engineering Hohai University Nanjing 210098 China National Engineering Research center of Water Resources Efficient Utilization and Engineering Safety Hohai University Nanjing 210098 China

The Three Gorges Reservoir (TGR) began operation in 2003 with alterations in the natural hydrological regime and with severe environmental impacts. Baguazhou Reach, a goose-head pattern of braided channels in the lower Yangtze River has emerged due to a series of changes in the water and sediment conditions caused by the TGR. This paper makes simulations of the hydrodynamic characteristics under the condition of clear water releasing from the TGR and analyzes the features of deformation within the branches of the reach, as well as predicts the future development of the hydrodynamic improvement and the additional fluvial processes. The results show that the decline of the tributary is mainly due to the weakening of the inflow energy and the channel resistance. The particular protective measures can effectively improve the hydrodynamic performance and the present situation but, they all result in a deflection of the main water flow and increase the local velocity, and over the long term, leading to the deposition in the junction areas, where a special protection is required.

关键词： Braided channel hydrodynamic enhancement

Dense pair plasma generation and its modulation dynamics in counter-propagating laser field

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Chinese Physics B 2018年第10期27卷 433-439页

作者： Wei-Yuan Liu Wen Luo Tao Yuan Ji-Ye Yu Min Chen School of Nuclear Science and Technology University of South ChinaHengyang 421001China Key Laboratory for Laser Plasmas（MoE） School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China IFSA Collaborative Innovation center Shanghai Jiao Tong UniversityShanghai 200240China

With two-dimensional quantum electrodynamics（QED） particle-in-cell simulations, a dense electron-positron（e^-e~＋） pair generation from laser-solid interactions is demonstrated. When the interaction of two linearly polarized laser pulses with a thin target enters into the relativistic transparency regime, a stable standing wave（SW） field can be formed by the overlap of the two counter-propagating laser pulses directly. The present study aims to clarify the effects of the S W field on the dynamics of e^-e^＋ pair plasmas. Our results indicate that under the combined effect of the SW field and radiation reaction（RR） effect, the created e^-e^＋ pairs can be trapped into the electric field nodes when the field strength is *** trapping effect contributes to the generation of γAV≥400 and ultra-dense pair plasmas in the two-side irradiation scheme. Despite different laser intensities, these pair plasmas have a Maxwellian spectral distribution with a peak energy of 150 MeV. Besides, the periodical modulation of the average energy, spatial, phase-space, and angular patterns of the e^-e^＋ pair plasmas can be triggered. In the angular patterns, as long as the SW field exists, pair plasmas can be pinched along the laser polarization direction. These results may offer a better understanding of the laser-solid interactions in the experiments when 10-PW laser facilities come into operation in the future.

关键词： PIC simulation laser-plasma interaction standing wave radiation reaction

Achieving Physical Layer Security Against Location Unknown Eavesdroppers via Friendly Jammer

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自动化学报:英文版 2023年第10期10卷 2038-2040页

作者： Heng Zhang Jianwei Sun Xin Wang Chenglong Gong School of Computer Engineering Jiangsu Ocean UniversityLianyungang 222000China School of Electronic Engineering Jiangsu Ocean UniversityLianyungang 222000China Shandong Provincial Key Laboratory of Computer Networks Shandong Computer Science CenterQilu University of TechnologyJinan 250014China

Dear Editor, This letter is concerning friendly jamming unmanned aerial vehicles(UAVs) to assist in the safe communication of UAV base stations. Due to the openness of UAV wireless communication, it is vulnerable to attacks leading to information disclosure or blockage. To address this issue, friendly jamming UAVs can assist UAV base stations and improve the security of wireless communications.

关键词： communication letter base

Reconfigurable intelligent surfaces for smart wireless environments: channel estimation, system design and applications in 6G networks

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Science China(Information Sciences) 2021年第10期64卷 52-72页

作者： Ying-Chang LIANG Jie CHEN Ruizhe LONG Zhen-Qing HE Xianqi LIN Chenlu HUANG Shilin LIU Xuemin (Sherman) SHEN Marco DI RENZO center for Intelligent Networking and communications University of Electronic Science and Technology of China School of Electronic Science and Engineering University of Electronic Science and Technology of China Department of Electrical and Computer Engineering University of Waterloo Université Paris-Saclay CNRS CentraleSupélec Laboratoire des Signaux et Systèmes

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.

关键词： reconfigurable intelligent surface channel estimation RIS-aided wireless communications RIS-based information transmission 6G

Remaining useful life prediction of aircraft lithium-ion batteries based on F-distribution particle filter and kernel smoothing algorithm

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Chinese Journal of Aeronautics 2020年第5期33卷 1517-1531页

作者： Kai ZHANG Peng ZHAO Canfei SUN Youren WANG Zewang CHEN College of Automation Engineering Nanjing University of Aeronautics and AstronauticsNanjing 211106China Aviation Industry Corporation Leihua Electronic Technology Research Institute Wuxi 214000China Testing and Verification center Aviation Key Laboratory of Science and Technology on Fault Diagnosis and Health ManagementShanghai 201601China

As an emergency and auxiliary power source for aircraft,lithium(Li)-ion batteries are important components of aerospace power *** Remaining Useful Life(RUL)prediction of Li-ion batteries is a key technology to ensure the reliable operation of aviation power *** Filter(PF)is an effective method to predict the RUL of Li-ion batteries because of its uncertainty representation and management ***,there are problems that particle weights cannot be updated in the prediction stage and particles *** settle these issues,an innovative technique of F-distribution PF and Kernel Smoothing(FPFKS)algorithm is *** the prediction stage,the weights of the particles are dynamically updated by the F kernel instead of being fixed all the ***,a first-order independent Markov capacity degradation model is ***,the kernel smoothing algorithm is integrated into PF,so that the variance of the parameters of capacity degradation model keeps *** based on NASA battery data sets show that FPFKS can be excellently applied to RUL prediction of Liion batteries.

关键词： F-distribution Kernel smoothing Lithium-ion batteries Markov model Particle filter Prediction Remaining useful life

Bamboo charcoal addition enhanced the nitrogen removal of anammox granular sludge with COD:Performance,physicochemical characteristics and microbial community

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Journal of Environmental Sciences 2022年第5期34卷 55-64页

作者： Menglei Guo Ying Jiang Junxiang Xie Qianfei Cao Qun Zhang Adams Mabruk Chongjun Chen School of Environmental Science and Engineering Suzhou University of Science and TechnologySuzhou 215009China Jiangsu Collaborative Innovation center of Technology and Material of Water Treatment Suzhou 215009China Jiangsu Provincial Key Laboratory of Environmental Science and Engineering Suzhou University of Science and TechnologySuzhou 215009China

The effects of different chemical oxygen demand(COD)concentrations on the anammox granular sludge with Bamboo Charcoal(BC)addition were evaluated in UASB *** results showed that the average total nitrogen(TN)removal efficiency was reduced from 85.9%to 81.4%when COD concentration was increased from 50 to 150 mg/***,the TN removal efficiency of BC addition reactors was dramatically 3.1%-6.4%higher than that without BC under different COD *** average diameter of granular sludge was 0.13 mm higher than that without *** settling velocity was increased by elevated COD concentration,while the EPS and VSS/SS were increased with BC *** high-throughput Miseq sequencing analyses revealed that the bacterial diversity and richness were decreased under COD addition,and the Planctomycetes related to anammox bacteria were Candidatus Brocadia and Candidatus *** Metagenomic sequencing indicated that the abundance of denitrification related functional genes all increased with elevated COD,while the abundance of anammox related functional genes of *** func-tional genes related to anammox was hydrazine synthase encoding genes(hzsA,hzsB and hzsB).The average relative abundance of hzs genes in the reactor with BC addition was higher than the control at COD concentrations of 50 mg/L and 150 mg/*** functional genes of denitrification mediated by BC were higher than those without BC throughout the operation *** is interesting to note that BC addition greatly enriched the related func-tional genes of denitrification and anammox.

关键词： Anammox granular sludge Bamboo charcoal COD concentration Nitrogen removal Microbial community