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Fjord-Type AIEgens Based on Inherent Through-Space Conjugation

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CCS Chemistry 2024年第7期6卷 1739-1747页

作者： Ye-qiang Han Yuan Xie Jianyu zhang Shiyu Tan Haoke zhang Ben Zhong Tang Jonathan L.Sessler Feihe Huang Stoddart Institute of Molecular Science Department of ChemistryZhejiang UniversityHangzhou 310058 Zhejiang-Israel Joint Laboratory of Self-Assembling Functional Materials ZJU-Hangzhou Global Scientific and Technological Innovation CenterZhejiang UniversityHangzhou 311215 MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang UniversityHangzhou 310058 Center for AIE Research College of Materials Science and EngineeringShenzhen UniversityShenzhen 518061 Department of Chemistry Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and ReconstructionThe Hong Kong University of Science and TechnologyKowloonHong Kong 999077 School of Science and Engineering Shenzhen Institute of Aggregate Science and TechnologyThe Chinese University of Hong KongShenzhen(CUHK-Shenzhen)Guangzhou 518172 Department of Chemistry The University of Texas at AustinAustinTexas 78712-1224 green Catalysis Center and College of Chemistry Zhengzhou UniversityZhengzhou 450001

Through-space conjugation(TSC)is a noncovalently electronic interaction that is emerging as a potential complement to through-bond conjugation(TBC)-based strategies for constructing luminescent ***,the design of efficient luminogens based on TSC is currently challenging due to a lack of established structure-property *** is particularly true in the case of luminogens displaying aggregation-induced emission(AIE)*** this work,three terphenyl derivatives were prepared,and their photophysical properties were systemically *** was found that relative to the corresponding m-and p-linked analogues,the electronic interaction of TBC is weakened while the strength of TSC is commensurately enhanced in the constitutional isomer containing an o-linked fjordtype *** this set of luminogens,the presence of a fjord-type arrangement promotes a transformation from aggregation-caused quenching to *** investigations involving congeneric quaterphenyl and pentphenyl isomers support the universality of the fjord-type unit as a framework for synthesizing AIE-active luminogens(AIEgens)with inherent *** work not only provides a novel set of AIEgens but also establishes the utility of TSC in controlling the photophysical properties of nonconventional and twisted luminogens.

关键词： fjord-type through-space conjugation through-bond conjugation aggregation-induced emission luminescence twisted conformation

New signature of low mass Z'in J/ψdecays

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Chinese Physics C 2024年第8期48卷 1-5页

作者： Chao-qiang geng Chia-Wei Liu Jiabao zhang School of Fundamental Physics and Mathematical Sciences Hangzhou Institute for Advanced StudyUCASHangzhou 310024China Tsung-Dao Lee Institute&School of Physics and Astronomy Shanghai Jiao Tong UniversityShanghai 200240China Institute of Theoretical Physics University of Chinese Academy of SciencesBeijing 100190China

We explored a new approach to search for a low-mass Z′particle through J/ψdecays by identifying its existence through parity-violating phenomena in the isospin-violating final states ofΛΣ¯^(0)and the corresponding charge conjugated states ofΛΣ¯^(0).Our investigation centered on a generation-independent and leptophobic Z′with mass below 10 *** the present experimental conditions at Beijing Spectrometer III(BESIII)and the anticipated opportunities at the Super Tau Charm Factory(STCF),we conducted Monte-Carlo simulations to predict possible events at both ***,we foresee a substantial enhancement in the precision of the lower limit estimation ofαNP as well as a reduction in statistical uncertainty with upcoming STCF ***,it is essential to highlight that a null result in the measurement ofαNP would impose stringent constraints,requiring the Z′−q−q couplings to be in the order of 10^(−2).

关键词： Z′ parity violation J/ψ

Satellite observations of coastal upwelling in the northern Arafura Sea

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Journal of Oceanology and Limnology 2024年第2期42卷 361-376页

作者： Zheyuan YU Zhanjiu HAO Zhenhua XU Peiwen zhang Jia YOU Baoshu YIN Hongwei YANg College of Mathematics and System Science Shandong University of Science and TechnologyQingdao 266590China CAS Key Laboratory of Ocean Circulation and Waves Institute of OceanologyChinese Academy of SciencesQingdao 266071China Pilot National Laboratory for Marine Science and Technology(qingdao) Qingdao 266237China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China University of Chinese Academy of Sciences Beijing 100049China CAS Engineering Laboratory for Marine Ranching Institute of OceanologyChinese Academy of SciencesQingdao 266071China

Coastal upwelling is significant for marine ecosystems by lifting nutrient-rich deep waters into the euphotic zone,thereby increasing primary and secondary *** satellite observations show that the northern Arafura Sea(NAS),especially in the coastal region,features high chlorophyll-a(chl-a)concentrations,implying a strong coastal ***,coastal upwelling in the NAS has not received much *** on a semi-automatic image processing technology,the seasonal and interannual variability of coastal upwelling in the NAS are investigated in this study using satellite-observed sea surface temperature(SST)and wind *** results suggest that there are seasonal coastal upwelling events in the NAS modulated by upwelling-favorable southeast monsoon(SEM).The annual mean days,mean area,and annual mean intensity of coastal upwelling events during the SEM season are 92 days,6514 km^(2),and-5.31×10^(5),respectively,while the corresponding values during the northwest monsoon(NWM)season are 32 days,5569 km^(2),and-1.41×10^(5).It is also found that the SEM coastal upwelling in the NAS displays prominent interannual *** strong upwelling events are found in 2010,2013,2016,and 2017 when the southeast monsoon winds were *** analysis suggests that at the interannual scale,the upwelling index(UI)averaged in the SEM season is negatively correlated with that of three upwelling *** can be attributed to the limitation of onshore geostrophic flow which is evidenced by the negative correlation between the UI and the alongshore difference in sea surface *** study highlights the important role of the southeast monsoon in the temporal variability of coastal upwelling in the NAS.

关键词： coastal upwelling the northern Arafura Sea southeast monsoon interannual variability

Distinct phosphorylation optimizes pathogen-induced PA and ROs bursts

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Molecular Plant 2024年第4期17卷 525-527页

作者： Kaihuai Lil Ruize zhang Yong Wang Fengquan Liu Zheng qing Fu Department of Plant Pathology College of AgricultureGuizhou UniversityGuiyang 550025China Department of Biological Sciences University of South CarolinaColumbiaSC29208USA Institute of Plant Protection Jiangsu Academy of Agricultural SciencesNanjingJiangsu 210014China

Phospholipids hold a multifaceted function in cellular *** primary function of phospholipids is to serve as essential building blocks of cell membranes,which gives cells crucial structural support and facilitates cellular *** that,phospholipids also act as key signaling molecules that coordinate vital cellular processes such as organismal development,homeostasis,and adaptation to environmental *** being the smallest and simplest phospholipid,phosphatidic acid(PA)plays a crucial role as a metabolic intermediate and second messenger.

关键词： homeostasis lipids smallest

Spatiotemporal Characteristics and Influencing Factors of the Synergistic Effect of Pollution Reduction and Carbon Reduction in China

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Huanjing Kexue/Environmental Science 2024年第9期45卷 4993-5002页

作者： Wang Y.-N. Li B.-X. zhang Y.-X. Zhao Y. Miao C.-K. An J.-q. School of Economics and Management Northwest A&F University Yangling 712100 China

Based on the use of the coupling coordination model to calculate the coupling coordination degree of carbon emission and pollutant control，the national，regional，and provincial spatiotemporal characteristics of the synergistic effect of pollution control and carbon emissions reduction in China were further analyzed，facilitating the crucial to identification of key areas. The fixed effects regression models and provincial panel data from 2006 to 2020 were used to explore factors contributing to better synergizing the reduction of pollution and carbon emissions in China. On this basis，the adjustment variable of R&D investment intensity was introduced，and the regulation effect model was constructed to further explore the influence mechanism of the synergistic effect of pollution reduction and carbon reduction. The results showed that：synergy exists between carbon emission reduction and the air pollution control system，the evolution of the synergistic effect of pollution reduction and carbon reduction in China presented an inverted "U"-shaped trend from 2006 to 2020，and there was spatial aggregation and a spatial spillover effect in pollution reduction and carbon reduction. The synergistic governance of carbon emission and pollutant control was still at a relatively low level. The carbon emission and air pollutant emission systems were still in an unstable and uncoordinated state. The results showed that：The degree of coordination of eastern China，central China，and western China decreased in turn. At the national level，energy consumption structure，per capita gDP，and the proportion of green investment were the main factors affecting the synergistic effect of pollution reduction and carbon. The heterogeneity of the influencing factors existed in the central，eastern，and western regions on industrial structure，energy consumption structure，energy utilization efficiency，per capita gDP，urbanization rate，the proportion of green investment，and transportation structure. The intens

关键词： fixed effects regression influencing mechanism moderating effect pollution and carbon emission reduction spatio-temporal characteristic

Non-Existence of Entire Solution of a Type of System of Equations

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Journal of Mathematical Research with Applications 2024年第2期44卷 213-224页

作者： Zhiwei ZHOU Ying zhang Zhigang HUANg School of Mathematics Suzhou University of Science and Technology Information Construction and Management Center Suzhou University of Science and Technology

In this paper, we will prove that the system of differential-difference equations■ has no transcendental entire solution(f(z), g(z)) with ρ(f, g) < ∞ such that λ(f) < ρ(f) andλ(g) < ρ(g), where P1(z), q1(z), P2... 详细信息

In this paper, we will prove that the system of differential-difference equations■ has no transcendental entire solution(f(z), g(z)) with ρ(f, g) g) g), where P1(z), q1(z), P2(z) and q2(z) are non-vanishing polynomials.

关键词： transcendental entire function finite order system of differential-difference equations

Wavelength injection locking actively q-switched random fiber laser based on random phase-shifted fiber Bragg grating and electro-optic modulator

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Optoelectronics Letters 2024年第3期20卷 135-141页

作者： PAN Honggang zhang Bo SONg Dianyou CHEN Zhipan CHEN Chunqi LI Rupeng School of Integrated Circuit Science and Engineering Tianjin University of TechnologyTianjin 300384China

In this paper, an actively q-switched wavelength injection locking random fiber laser(RFL) based on random phase-shifted fiber Bragg grating(RPS-FBg) is proposed, and the performance of the laser is verified by experiments. Within the reflection bandwidth range of RPS-FBg, spanning from 1 549.2 nm to 1 549.9 nm, different laser modes with stable central wavelength and peak power can be selectively chosen by varying the injected light wavelength. The power fluctuation within 1 h is less than 0.1 d Bm, and the central wavelength drift is less than 0.02 nm. When the pump power increases from 90 mW to 300 mW, the pulse width decreases from 3.2 μs to 1.5 μs, and the pulse repetition frequency is 20 kHz. The RFL can reach a stable locking state at the lowest pump power of 100 mW and the lowest injection power of 3 d Bm. When the wavelength is locked, the output pulse is a single pulse. On the contrary, the unlocked output pulse is multi-pulse. The laser has the characteristics of high wavelength tunability in the reflection range of RPS-FBg and it can be an ideal light source in the fields of laser imaging and pulse coding.

关键词： fiber switched modulator

gENERALIZED FORELLI-RUDIN TYPE OPERATORS BETWEEN SEVERAL FUNCTION SPACES ON THE UNIT BALL OF C^(N)

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Acta Mathematica Scientia 2024年第4期44卷 1301-1326页

作者： Xuejun zhang Yuting gUO Hongxin CHEN Pengcheng TANg College of Mathematics and Statistics Hunan Normal University.Changsha 410081China School of Mathematics Hunan UniversityChangsha 410082China School of Mathematics and Computational Science Hunan University of Science and TechnologyXiangtan 411201China

In this paper,we investigate sufficient and necessary conditions such that generalized Forelli-Rudin type operators T_(λ,τ,k),S_(λ,τ,k),q_(λ,τ,k)and R_(λ,τ,k)are bounded between Lebesgue type *** order to prov... 详细信息

关键词： Forelli-Rudin type operator L^(p q s k)(B_(n))space boundedness unit ball

Joint UAV trajectory and communication design with heterogeneous multi-agent reinforcement learning

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Science China(Information Sciences) 2024年第3期67卷 225-245页

作者： Xuanhan ZHOU Jun XIONg Haitao ZHAO Xiaoran LIU Baoquan REN Xiaochen zhang Jibo WEI Hao YIN College of Electronic Science and Technology National University of Defense Technology Systems Engineering Institute Academy of Military Sciences PLA

Unmanned aerial vehicles(UAVs) are recognized as effective means for delivering emergency communication services when terrestrial infrastructures are unavailable. This paper investigates a multiUAV-assisted communication system, where we jointly optimize UAVs’ trajectories, user association, and ground users(gUs)’ transmit power to maximize a defined fairness-weighted throughput metric. Owing to the dynamic nature of UAVs, this problem has to be solved in real time. However, the problem’s non-convex and combinatorial attributes pose challenges for conventional optimization-based algorithms, particularly in scenarios without central controllers. To address this issue, we propose a multi-agent deep reinforcement learning(MADRL) approach to provide distributed and online solutions. In contrast to previous MADRLbased methods considering only UAV agents, we model UAVs and gUs as heterogeneous agents sharing a common objective. Specifically, UAVs are tasked with optimizing their trajectories, while gUs are responsible for selecting a UAV for association and determining a transmit power level. To learn policies for these heterogeneous agents, we design a heterogeneous coordinated qMIX(HC-qMIX) algorithm to train local q-networks in a centralized manner. With these well-trained local q-networks, UAVs and gUs can make individual decisions based on their local observations. Extensive simulation results demonstrate that the proposed algorithm outperforms state-of-the-art benchmarks in terms of total throughput and system fairness.

关键词： unmanned aerial vehicle (UAV) trajectory design resource allocation multi-agent deep reinforcement learning (MADRL) heterogeneous agents