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Financing strategy of SMEs based on the shortage of environmental protection funds

Procedia Computer science 2022年 199卷 1521-1528页

作者： Wang Haiyang Zhuang Xiaohui College of Automation and Electronic Engineering Qingdao University of Science & Technology Qingdao 260061 China School of Management Shandong Key Laboratory of Social Supernetwork Computation and Decision Simulation Shandong University Jinan Shandong 250100 China

With the development of society, environmental protection issues have received increasing attention. The increase in environmental protection requirements has greatly affected small and medium-sized enterprises（SMEs）. Due to the poor credit status and imperfect systems of SMEs, financing is difficult and expensive, which makes environmental protection funds insufficient, leading to outstanding environmental protection problems. In the supply chain, in order to maintain the stability of the supply chain, the core enterprises will help SMEs to alleviate the funding difficulties. This article starts from the supply chain financing of SMEs, explores the specific ways that core enterprises can help SMEs in supply chain financing, and analyses the feasibility of financing methods. Through analysis and demonstration, it is found that core enterprises can help SMEs with supply chain financing through prepayments, help small and medium-sized suppliers solve the problem of insufficient environmental protection funds, and core enterprises can obtain benefits from it.

关键词： Supply Chain Finance Small medium-sized enterprises (SMEs) Prepayments

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UAV-Assisted Joint Mobile Edge Computing and Data Collection via Matching-Enabled Deep Reinforcement Learning

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IEEE Internet of Things Journal 2025年

作者： Wang, Boxiong Kang, Hui Li, Jiahui Sun, Geng Sun, Zemin Jilin University College of Computer Science and Technology Changchun130012 China Jilin University Key Laboratory of Symbolic Computation and Knowledge Engineering of Ministry of Education Changchun130012 China Nanyang Technological University College of Computing and Data Science 639798 Singapore

Unmanned aerial vehicle (UAV)-assisted mobile edge computing (MEC) and data collection (DC) have been popular research issues. Different from existing works that consider MEC and DC scenarios separately, this paper investigates a multi-UAV-assisted joint MEC-DC system. Specifically, we formulate a joint optimization problem to minimize the MEC latency and maximize the collected data volume. This problem can be classified as a non-convex mixed integer programming problem that exhibits long-term optimization and dynamics. Thus, we propose a deep reinforcement learning-based approach that jointly optimizes the UAV movement, user transmit power, and user association in real time to solve the problem efficiently. Specifically, we reformulate the optimization problem into an action space-reduced Markov decision process (MDP) and optimize the user association by using a two-phase matching-based association (TMA) strategy. Subsequently, we propose a soft actor-critic (SAC)-based approach that integrates the proposed TMA strategy (SAC-TMA) to solve the formulated joint optimization problem collaboratively. simulation results demonstrate that the proposed SAC-TMA is able to coordinate the two subsystems and can effectively reduce the system latency and improve the data collection volume compared with other benchmark algorithms. © 2025 IEEE. All rights reserved,

关键词： Unmanned aerial vehicles (UAV)

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ON THE APPROXIMATION OF QUASIPERIODIC FUNCTIONS WITH DIOPHANTINE FREQUENCIES BY PERIODIC FUNCTIONS

arXiv

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arXiv 2023年

作者： Jiang, Kai Li, Shifeng Zhang, Pingwen Hunan Key Laboratory for Computation and Simulation in Science and Engineering Key Laboratory of Intelligent Computing and Information Processing of Ministry of Education School of Mathematics and Computational Science Xiangtan University Hunan Xiangtan411105 China School of Mathematics and Statistics Wuhan University Wuhan430072 China School of Mathematical Sciences Peking University Beijing100871 China

We present an analysis of the approximation error for a d-dimensional quasiperiodic function f with Diophantine frequencies, approximated by a periodic function with the fundamental domain [0, L1) × [0, L2) × · · · × [0, Ld). When f has a certain regularity, its global behavior can be described by a finite number of Fourier components and has a polynomial decay at infinity. The dominant part of periodic approximation error is bounded by (formula presented), where Lj belongs to the best simultaneous approximation sequence and sj is the number of different irrational elements in j-th dimension component of Fourier frequencies, respectively. Meanwhile, we discuss the approximation rate. Finally, these analytical results are verified by some examples. Copyright © 2023, The Authors. All rights reserved.

关键词： Natural frequencies

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DeepDir: a deep learning approach for API directive detection

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science China(Information sciences) 2021年第9期64卷 238-240页

作者： Jingxuan ZHANG He JIANG Shuai LU Ge LI Xin CHEN College of Computer Science and Technology Nanjing University of Aeronautics and Astronautics State Key Laboratory for Novel Software Technology Nanjing University Key Laboratory of Complex Systems Modeling and Simulation Ministry of Education School of Software Dalian University of Technology School of Electronic Engineering and Computer Science Peking University School of Computer Science and Technology Hangzhou Dianzi University

Dear editor,Software developers tend to reuse existing libraries to facilitate their development process and implement certain functionalities by invoking application programming interfaces(APIs) [1]. However, it remains a challenging task for developers to correctly use APIs [2], so they often consult API learning resources [3, 4]. As one of the most important API learning resources,

关键词： API Specification API Directive Deep Learning Text Classification Imbalanced Learning

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ACCURATELY RECOVER GLOBAL QUASIPERIODIC SYSTEMS BY FINITE POINTS

arXiv

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arXiv 2023年

作者： Jiang, Kai Zhou, Qi Zhang, Pingwen Hunan Key Laboratory for Computation and Simulation in Science and Engineering Key Laboratory of Intelligent Computing and Information Processing Ministry of Education School of Mathematics and Computational Science Xiangtan University Hunan Xiangtan411105 China School of Mathematics and Statistics Wuhan University Wuhan430072 China School of Mathematical Sciences Peking University Beijing100871 China

Quasiperiodic systems, related to irrational numbers, are space-filling structures without decay nor translation invariance. How to accurately recover these systems, especially for non-smooth cases, presents a big challenge in numerical computation. In this paper, we propose a new algorithm, finite points recovery (FPR) method, which is available for both smooth and non-smooth cases, to address this challenge. The FPR method first establishes a homomorphism between the lower-dimensional definition domain of the quasiperiodic function and the higher-dimensional torus, then recovers the global quasiperiodic system by employing interpolation technique with finite points in the definition domain without dimensional lifting. Furthermore, we develop accurate and efficient strategies of selecting finite points according to the arithmetic properties of irrational numbers. The corresponding mathematical theory, convergence analysis, and computational complexity analysis on choosing finite points are presented. Numerical experiments demonstrate the effectiveness and superiority of FPR approach in recovering both smooth quasiperiodic functions and piecewise constant Fibonacci quasicrystals. While existing spectral methods encounter difficulties in accurately recovering non-smooth quasiperiodic *** Codes 11J68, 65D05, 65D15, 68W25 © 2023, CC BY-NC-ND.

关键词： Interpolation

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Research on key Technologies of Cross-domain Guidance 8

Research on Key Technologies of Cross-domain Guidance

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8th Symposium on Novel Photoelectronic Detection Technology and Applications

作者： Guo, Xiaoyun Wu, Chengfeng Fang, Xueli Xu, Cheng Li, Hui Beijing Institute of Mechanical and Electrical Engineering Beijing China Beijing Institute of Mechanical and Electrical Engineering Science and Technology on Complex System Control and Intelligent Agent Cooperative Laboratory Beijing China Beijing Institute of Mechanical and Electrical Engineering Key Laboratory of Complex Aviation Simulation System Beijing China

ISBN: (数字)9781510653122

ISBN: (纸本)9781510653115

Cross-domain synergy and intelligence will become important features of future warfare. Cross-domain guidance is one of the typical forms of cross-domain synergy. It can significantly improve the ability to respond quickly to random targets and time-sensitive targets and enhance the anti-jamming ability in the case of confrontation. This article introduces the concept and winning mechanism of cross-domain guidance, analyzes the research progress of cross-domain guidance at home and abroad, combs the key technologies of cross-domain guidance, summarizes the current challenges and problems in cross-domain guidance research, and proposes development suggestions. © 2022 SPIE

关键词： Optical engineering

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Performance study of activated carbon reinforced internal circulation reactor for high-salt organic production wastewater treatment

Journal of Biotech Research

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Journal of Biotech Research 2023年 14卷 264-278页

作者： Xiao, Xin Lu, Qinfang Tang, Ming Zhang, Xiaoyu Jeong, Byung-gon Jiang, Wei Lai, Shirong Key Laboratory of Industrial Ecological Simulation and Environmental Health in the Yangtze River Basin in Jiangxi Province Jiujiang University Jiangxi Jiujiang332005 China School of Chemistry and Environment Jiujiang University Jiangxi Jiujiang332005 China Department of Environmental Engineering Kunsan National University Gunsan54150 Korea Republic of Science Environmental Protection Technology Thain Co. Ltd. Jiangxi Jiujiang China

When the biological method is used to treat organic wastewater with high salinity, the large amount of salt has a strong inhibitory effect on microbial growth. Therefore, traditional biological and physical-chemical treatment technologies are difficult to meet the standards for treating high-salinity organic wastewater. There is an urgent need to study how to strengthen the biological treatment process for the treatment of high-salt production wastewater. This study investigated the effect of activated carbon biofortification anaerobic reactor with coconut shell granular activated carbon. The study found that the optimal dosage of activated carbon was 6 g/L. The results demonstrated that mixing 2 g/L activated carbon with activated sludge before entering the wastewater treatment had a stronger treatment effect than making activated carbon and wastewater entering the reactor at the same time to contact sludge. The treatment effect of the internal circulation (IC) system with granular activated carbon under the optimized dosage and method was better than that of the IC system that was not reinforced with activated carbon with the removal rate increased by 4-10%. Activated carbon enhanced IC reactor had higher resistance to organic load impact and better chroma removal ability. These results provided reference for the treatment of similar high-salinity organic industrial wastewater. © (2023), (Journal of Biotech Research). All Rights Reserved.

关键词： Activated carbon

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A novel spatial-temporal radial Trefftz collocation method for the backward heat conduction analysis with time-dependent source term

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International Journal of Heat and Mass Transfer 2023年 201卷

作者： Li, Mingjuan Fu, Zhuojia Xu, Wenzhi Fan, Chia-Ming Key Laboratory of Ministry of Education for Coastal Disaster and Protection Hohai University Nanjing210098 China Center for Numerical Simulation Software in Engineering and Sciences College of Mechanics and Materials Hohai University Nanjing211100 China Department of Harbor and River Engineering & Computation and Simulation Center National Taiwan Ocean University Keelung20224 Taiwan

In this paper, a novel spatial-temporal radial Trefftz collocation method (STRTCM) is proposed to solve 2D and 3D backward heat conduction equations with time-dependent source term. Unlike the traditional time-domain discretization strategies (Laplace/Fourier transformation and time-stepping methods), the proposed spatial-temporal meshless collocation method employs the derived semi-analytical spatial-temporal radial Trefftz basis function as basis function, which naturally satisfies the governing equation with zero source term in advance. Due to this property, only the final conditions and boundary conditions need to be discretized. For non-zero source term, the extended multiple reciprocity method (E-MRM) is introduced to transform the original governing equation with several specific source terms to the high-order governing equation without the source term. By deriving the high-order semi-analytical spatial-temporal radial Trefftz basis function, the STRTCM can also avoid the node discretization of governing equation. For solving the backward heat conduction equations, the present numerical scheme uses the final temperature distribution and the related boundary conditions to obtain the unknown initial temperature field. Finally, the accuracy and efficiency of the proposed method is numerically verified by four benchmark examples about backward heat conduction equations with time-dependent source term. © 2022 Elsevier Ltd

关键词： Boundary conditions

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White-light-driven fluorescence switch for super-resolution imaging guided photodynamic and photoacid therapy

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science China Chemistry 2022年第12期65卷 2528-2537页

作者： Hao Chen Kaikai Wen Yu Lu Xin Zhang Yuhao Shi Qinqin Shi Han Ma Qian Peng Hui Huang College of Materials Science and Opto-Electronic Technology&Center of Materials Science and Optoelectronics Engineering&CAS Center for Excellence in Topological Quantum Computation&CAS Key Laboratory of Vacuum Physics University of Chinese Academy of SciencesBeijing100049China Department of Neurosurgery and Health Science Center Shenzhen Second People’s HospitalThe First Affiliated HospitalShenzhen UniversityShenzhen518035China School of Chemical Sciences University of Chinese Academy of SciencesBeijing100049China Department of Dermatology&Guangdong Provincial Key Laboratory of Biomedical Imaging The Fifth Affiliated Hospital Sun Yat-sen UniversityZhuhai519000China

Photocaged fluorophores with photoactivatable characteristics presented important applications in imaging the biological structures and *** advantage of their super-resolution imaging merits to manipulate and visualize anti-cancer treatment is always a goal of modern clinical *** photodynamic therapy(PDT) is a noninvasive treatment but limited in intracellular oxygen *** I PDT and photoacid therapy(PAT) are two effective supplements of traditional PDT especially in hypoxic ***,a novel white-light-driven fluorescence switch(7H-dibenzo[c,g]carbazol-7-yl)(2-iodophenyl)methanone(2IB) was designed and synthesized as an unprecedent “all in one” platform for stochastic optical reconstruction microscopy(STORM) imaging guided Type Ⅰ/Ⅱ PDT and *** experimental and theoretical studies revealed that the working mechanism is based on two competing paths under excitation:photosensitization and photocyclization *** intersystem crossing(ISC) ensured the generation of reactive oxygen species(ROS) for PDT,while low energy barrier facilitated the photocyclization reaction that simultaneously yielded emissive fluorophores(2IBC) and H^(+) for super-resolution imaging and photoacid,***,the fluorescent intensity of mitochondria-targeted 2IBC was positively correlated with treatment efficacy,which is beneficial to spatiotemporally visualized therapeutic process and *** a result,superior anti-tumor performance was achieved in vitro and in *** contribution provided a multifunctional nanodrug paradigm for multimode cancer diagnosis and treatment.

关键词： photocaged fluorophores super-resolution imaging type I/II photodynamic therapy photoacid therapy outcome self-report

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The impact of the atmospheric turbulence-development tendency on new particle formation: a common finding on three continents

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National science Review 2021年第3期8卷 140-150页

作者： Hao Wu Zhanqing Li Hanqing Li Kun Luo Yuying Wang Peng Yan Fei Hu Fang Zhang Yele Sun Dongjie Shang Chunsheng Liang Dongmei Zhang Jing Wei Tong Wu Xiaoai Jin Xinxin Fan Maureen Cribb Marc L.Fischer Markku Kulmala Tuukka Pet?j? State Key Laboratory of Remote Sensing Science College of Global Change and Earth System ScienceBeijing Normal University ESSIC and Department of Atmospheric Science University of MarylandCollege Park State Key Laboratory of Clean Energy Utilization Zhejiang University School of Atmospheric Physics Nanjing University of Information Science and Technology Meteorological Observation Center China Meteorological Administration State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric Physics Chinese Academy of Sciences State Key Joint Laboratory of Environmental Simulation and Pollution Control College of Environmental Sciences and Engineering Peking University State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Lawrence Berkeley National Laboratory Institute for Atmospheric and Earth System Research/Physics Faculty of ScienceUniversity of Helsinki Aerosol and Haze Laboratory Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical Technology Joint International Research Laboratory of Atmospheric and Earth System Sciences School of Atmospheric Sciences Nanjing University

A new mechanism of new particle formation(NPF) is investigated using comprehensive measurements of aerosol physicochemical quantities and meteorological variables made in three continents,including Beijing,China;the Southern Great Plains site in the USA;and SMEAR Ⅱ Station in Hyytiala,Finland.D espite the considerably different emissions of chemical species among the sites,a common relationship was found between the characteristics of NPF and the stability *** stability parameter(ζ=Z/L,where Z is the height above ground and L is the Monin-Obukhov length) is found to play an important role;it drops significantly before NPF as the atmosphere becomes more unstable,which may serve as an indicator of nucleation *** the atmosphere becomes unstable,the NPF duration is closely related to the tendency for turbulence development,which influences the evolution of the condensation ***,the unstable atmosphere may dilute pre-existing particles,effectively reducing the condensation sink,especially at coarse mode to foster *** new mechanism is confirmed by model simulations using a molecular dynamic model that mimics the impact of turbulence development on nucleation by inducing and intensifying homogeneous nucleation events.

关键词： new particle formation turbulence development molecular dynamic

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