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Journal of Analysis and Testing 2023年第3期7卷 189-203页

作者： Yijun Pang Zhiquan Chen Didi Yang Xuke Fan Zhenda Liang Yongtao Xu Sheng Ye Jiancong Liu Li Zhou institute of Environmental research at great bay area Key Laboratory for Water Quality and Conservation of the Pearl River DeltaMinistry of EducationGuangzhou UniversityGuangzhou 510006China School of Pharmacy Hubei University of Science and TechnologyXianning 437100China

Non-antibiotic fungicides are urgently needed due to the potential threat of drug-resistant bacteria to human health.In this research,a novel antibacterial nanoplatform based on CeO_(2)@C-N has been developed to achieve rapid near-infrared(NIR)laser-induced sterilization.The prepared CeO_(2)@C-N hybrid material exhibited a nanowire-like structure,with dispersed CeO_(2)nanoparticles averaging 5 nm in size within the heterogeneous configuration.X-ray photoelectron spectroscopy(XPS)and Raman spectra revealed that the heterogenous structures have a significant amount of oxygen vacancies and defects.Notably,CeO_(2)@C-N has a narrower band gap than CeO_(2),which allows for broader absorbance extending to the NIR region.With these unique physiochemical properties,CeO_(2)@C-N could inactivate E.coli and MRSA at a low concentration(20 mg/L)under 808 nm NIR laser(1 W/cm^(2))irradiation.The excellent bactericidal activity of CeO_(2)@C-N is attributed to the combination of photodynamic and photo thermal processes,based on its excellent photo-thermal conversion property,detection of reactive oxygen species(ROS)(^(1)O_(2)and·OH)under light irradiation,and scavenger quenching experiment results.This study offers a feasible and efficient way to fabricate a highly effective antibacterial candidate.

关键词： Photothermal Photodynamic Heterogenous structure Antibacterial Cerium Carbon

Voluntary CSR disclosure, institutional environment,and independent audit demand

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China Journal of Accounting research 2019年第4期12卷 357-377页

作者： Peipei Zheng Chunyan Ren School of Accounting/institute of Capital Market and Audit Governance Studies for the great bay area(Guangdong Hong KongMacao)Guangdong University of Finance and EconomicsChina School of Management Xiamen UniversityChina

Using a sample of A-share listed companies on the Shanghai and Shenzhen Stock Exchanges,this study examines the impact of voluntary corporate social responsibility(CSR)disclosure on independent audit demand in different institutional environments.The sample covers the 2008–2016 period and excludes firms that are required to disclose CSR information.The findings show that compared with companies that choose to not disclose such information,companies that voluntarily disclose CSR information prefer to employ‘‘small"accounting firms for auditing services,although the auditing fees are much higher.However,as the institutional environment improves,this preference is weakened.Further analyses show that this preference is stronger in enterprises where CSR disclosure is driven by strong political motivations and managerial self-interest motivations.Legitimate motivations and economic motivations do not significantly impact the preference for‘‘small"audit firms.Furthermore,this preference is more obvious in enterprises with poor operational performance and low information disclosure quality,and it increases as CSR disclosure level decreases.The study enriches our understanding of the economic consequences of voluntary CSR disclosure and the factors that influence independent audit demand.The results also have implications for the construction and regulation of China’s system for supervising CSR information disclosure in the transitional phase.

关键词： Voluntary disclosure of corporate social responsibility information Auditor selection Auditing fees Institutional environment

Aqueous-phase formation of N-containing secondary organic compounds affected by the ionic strength

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Journal of Environmental Sciences 2024年第4期138卷 88-101页

作者： Yuqi Gan Xiaohui Lu Shaodong Chen Xinghua Jiang Shanye Yang Xiewen Ma Mei Li Fan Yang Yewen Shi Xiaofei Wang Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention Department of Environmental Science and EngineeringFudan UniversityShanghai 200433China Shanghai institute of Pollution Control and Ecological Security Shanghai 200092China Guangdong Provincial Observation and research Station for Coastal Atmosphere and Climate of the great bay area Southern University of Science and TechnologyShenzhen 518055China institute of Mass Spectrometry and Atmospheric Environment Guangdong Provincial Engineering Research Center for On-line Source Apportionment System of Air PollutionJinan UniversityGuangzhouChina Environmental Monitoring Station of Pudong New District Shanghai 201200China Shanghai Municipal Center for Disease Control&Prevention Shanghai 200336China

The reaction of carbonyl-to-imine/hemiaminal conversion in the atmospheric aqueous phase is a critical pathway to produce the light-absorbing N-containing secondary organic compounds(SOC).The formation mechanism of these compounds has been wildly investigated in bulk solutions with a low ionic strength.However,the ionic strength in the aqueous phase of the polluted atmosphere may be higher.It is still unclear whether and to what extent the inorganic ions can affect the SOC formation.Here we prepared the bulk solution with certain ionic strength,in which glyoxal and ammonium were mixed to mimic the aqueous-phase reaction.Molecular characterization by High-resolution Mass Spectrometry was performed to identify the N-containing products,and the light absorption of the mixtures was measured by ultraviolet-visible spectroscopy.Thirty-nine N-containing compounds were identified and divided into four categories(N-heterocyclic chromophores,high-molecular-weight compounds with N-heterocycle,aliphatic imines/hemiaminals,and the unclassified).It was observed that the longer reaction time and higher ionic strength led to the formation of more N-heterocyclic chromophores and the increasing of the lightabsorbance of the mixture.The added inorganic ions were proposed to make the aqueous phase somewhat viscous so that the molecules were prone to undergo consecutive and intramolecular reactions to form the heterocycles.In general,this study revealed that the enhanced ionic strength and prolonged reaction time had the promotion effect on the lightabsorbing SOC formation.It implies that the aldehyde-derived aqueous-phase SOC would contribute more light-absorbing particulate matter in the industrial or populated area where inorganic ions are abundant.

关键词： Ionic strength Carbonyl-to-imine/hemiaminal Heterocyclic Brown carbon Mass spectrometry Aqueous-phase reaction

Nonlinear electronic and ultrafast optical signatures in chemical vapor-deposited ultrathin PtS_(2) ribbons

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Nano research 2022年第5期15卷 4366-4373页

作者： Shaolong Jiang Jin Yang Liang Zhu Jiafeng Xie Weiteng Guo Erding Zhao Chaoyu Chen Tianwu Wang Fuhai Su Yanfeng Zhang Junhao Lin Shenzhen Key Laboratory of Advanced Quantum Functional Materials and Devices and Department of Physics Southern University of Science and TechnologyShenzhen 518055China Key Laboratory of Materials Physics Institute of Solid State PhysicsHFIPSChinese Academy of SciencesHefei 230031China University of Science and Technology of China Hefei 230026China Great Bay Area Research Institute Aerospace Information Research Institute(AIR)of Chinese Academy of Science(CAS)Guangzhou 510700China Shenzhen institute for Quantum Science and Engineering and Department of Physics Southern University of Science and TechnologyShenzhen 518055China International Quantum Academy and Shenzhen BranchHefei National LaboratoryFutian DistrictShenzhen 518048China School of Materials Science and Engineering Peking UniversityBeijing 100871China

The emerging two-dimensional(2D)platinum disulfide(PtS_(2))has driven increasing attentions due to its high electron mobility,good air-stability,and strong interlayer interaction which leads to a widely tunable electronic structure.However,a detailed study on its covalent-like layer-dependent properties remains infant.Herein,we demonstrate the successful production of ultrathin 1T-PtS_(2) ribbons with thickness centralized almost at monolayer 1L-4L and large domain size up to 210 μm on Au foils using chemical vapor deposition(CVD)technique,which enables macro-and microscopic study of its extraordinary layer-dependent features with precise control of the number of layers.Using electron energy loss spectroscopy(EELS)and optical pump-probe spectroscopy(OPPS),we reveal that both the electron and ultrafast optical absorption signals of the as-grown 2D PtS_(2) show strong nonlinear layer-dependent responses which manifest discriminated transition in 1L-4L PtS_(2) ribbons.The layer-dependent nonlinear response of 2D PtS_(2) can be well interpreted in the frame of calculated electron and phonon structures.These achievements offer a platform for successfully fabricating large-sized ultrathin 2D PtS_(2) and facilitating our knowledge about its electronic and optoelectronic properties.

关键词： platinum disulfide(PtS_(2)) chemical vapor deposition electronic transition saturable absorption optical pump-probe spectroscopy

Disaggregated Datacenters for Future Cloud Computing

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Journal of Computer Science & Technology 2023年第5期38卷 947-948页

作者：徐志伟 institute of Computing Technology Chinese Academy of SciencesBeijing 100190China Great Bay UniversityDongguan 523000China

Datacenters are warehouse-scale computers providing compute,storage and network capabilities.Datacenters are engines of cloud computing and have seen rapid progress in the past two decades.A recent research trend is d... 详细信息

关键词： computer Data centers

Reputation repair and corporate donations:An investigation of responses to regulatory penalties

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China Journal of Accounting research 2019年第3期12卷 293-313页

作者： Xue Xia Fei Teng Xiaolong Gu Center for Accounting Financeand InstitutionsBusiness SchoolSun Yat-sen UniversityChina Accounting School/International Business School Guangdong University of Finance and EconomicsChina institute of Capital Market and Audit Governance Studies for the great bay area(Guangdong Hong-KongMacao)Guangdong University of Finance and EconomicsChina

According to the risk management and reputation insurance theory of corporate social responsibility, corporate donations can help a company to repair its reputation after a crisis.This study uses a propensity score matching–difference in difference(PSM + DID) methodology to investigate the charitable donation activities of companies that have been subject to regulatory penalties.The analysis of a sample of A-share listed companies in the 2004–2016 period shows that companies significantly increase their charitable donations after regulatory penalties, but this effect weakens over time.Further analysis reveals that non-state-owned companies, companies with higher ownership concentrations, and companies receiving severer penalties are more motivated to make donations after regulatory penalties.By studying the reputation repair behavior of companies that have been subject to regulatory penalties, this study offers further support for the risk management and reputation insurance theory of corporate social responsibility.It also enriches our understanding of companies’ active responses to regulatory penalties and provides insights into companies’ motives for making charitable donations.

关键词： Regulatory penalty Donation Reputation repair

THE UNIQUENESS FOR ALGEBROID FUNCTIONS OF FINITE ORDER

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Acta Mathematica Scientia 2020年第4期40卷 981-990页

作者：谭洋孔荫莹 School of Applied Mathematics Beijing Normal UniversityZhuhai 519085China School of Statistics and Mathematics Institute of Capital Market and Audit Governance Studies for the Great Bay Area(GuangdongHong-KongMacao)Guangdong University of Finance and EconomicsGuangzhou 510320China

In this article,we discuss,by Nevanlinna theory,the influence of multiple values and deficiencies on the uniqueness problem of algebroid functions.We get several uniqueness theorems of algebroid functions which includ... 详细信息

关键词： multiple values deficiencies order uniqueness algebroid functions

A Novel Pipelining Encryption Hardware System with High Throughput and High Integration for 5G

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China Communications 2022年第6期19卷 1-10页

作者： Yuntao Liu Zesheng Shen Shuo Fang Yun Wang College of Information and Communication Engineering Harbin Engineering UniversityHarbin 150001China Key Laboratory of Advanced Marine Communication and Information Technology Ministry of Industry and Information TechnologyHarbin 150001China Guangdong greater bay area institute of Integrated Circuit and System Guangzhou 510535China

This paper presents a ZUC-256 stream cipher algorithm hardware system in order to prevent the advanced security threats for 5 G wireless network.The main innovation of the hardware system is that a six-stage pipeline scheme comprised of initialization and work stage is employed to enhance the solving speed of the critical logical paths.Moreover,the pipeline scheme adopts a novel optimized hardware structure to fast complete the Mod(231-1)calculation.The function of the hardware system has been validated experimentally in detail.The hardware system shows great superiorities.Compared with the same type system in recent literatures,the logic delay reduces by 47%with an additional hardware resources of only 4 multiplexers,the throughput rate reaches 5.26 Gbps and yields at least 45%better performance,the throughput rate per unit area increases 14.8%.The hardware system provides a faster and safer encryption module for the 5G wireless network.

关键词： encryption hardware system for 5G ZUC-256 stream cipher algorithm pipeline scheme throughput rate integration rate

Perturbation of autophagy pathways in murine alveolar macrophage by 2D TMDCs is chalcogen-dependent

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Journal of Environmental Sciences 2024年第1期135卷 97-107页

作者： Xiaofei Zhou Weitao Jin Rui Zhang Xuan Mao Jianbo Jia Hongyu Zhou College of Science&Technology Hebei Agricultural UniversityHuanghua 061100China institute of Environmental research at greater bay area Key Laboratory for Water Quality and Conservation of the Pearl River DeltaMinistry of EducationGuangzhou UniversityGuangzhou 510006China

Increasing risks of incidental and occupational exposures to two-dimensional transition metal dichalcogenides(2D TMDCs)due to their broad application in various areas raised their public health concerns.While the composition-dependent cytotoxicity of 2D TMDCs has been well-recognized,how the outer chalcogenide atoms and inner transition metal atoms differentially contribute to their perturbation on cell homeostasis at non-lethal doses remains to be identified.In the present work,we compared the autophagy induction and related mechanisms in response to WS_(2),NbS_(2),WSe_(2)and Nb Se_(2)nanosheets exposures in MH-S murine alveolar macrophages.All these 2D TMDCs had comparable physicochemical properties,overall cytotoxicity and capability in triggering autophagy in MH-S cells,but showed outer chalcogen-dependent subcellular localization and activation of autophagy pathways.Specifically,WS_(2)and NbS_(2)nanosheets adhered on the cell surface and internalized in the lysosomes,and triggered m TOR-dependent activation of autophagy.Meanwhile,WSe_(2)and Nb Se_(2)nanosheets had extensive distribution in cytoplasm of MH-S cells and induced autophagy in an m TOR-independent manner.Furthermore,the 2D TMDCs-induced perturbation on autophagy aggravated the cytotoxicity of respirable benzo[a]pyrene.These findings provide a deeper insight into the potential health risk of environmental 2D TMDCs from the perspective of homeostasis perturbation.

关键词： Chalcogen group Autophagy pathway Cell function Endosomal escape Inhalation toxicity

Dual-reaction-center catalytic process continues Fenton's story

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Frontiers of Environmental Science & Engineering 2020年第5期14卷 65-73页

作者： Chao Lu Kanglan Deng Chun Hu Lai Lyu institute of Environmental research at greater bay area Key Laboratory for Water Quality and Conservation of the Pearl River Delta(Ministry of Education)Guangzhou UniversityGuangzhou 510006China

Triggered by global water quality safety issues,the research on wastewater treatment and water purification technology has been greatly developed in recent years.The Fenton technology is particularly powerful due to the rapid attack on pollutants by the generated hydroxyl radicals(·OH).However,both heterogeneous and homogeneous Fenton/Fenton-like technologies follow the classical reaction mechanism,which depends on the oxidation and reduction of the transition metal ions at single sites.So even after a century of development,this reaction still suffers from its inherent bottlenecks in practical application.In recent years,our group has been focusing on studying a novel heterogeneous Fenton catalytic process,and we developed the dual-reaction-center(DRC)system for the first time.In the DRC system,H2O2 and O2 can be efficiently reduced to reactive oxygen species(ROS)in electron-rich centers,while pollutants are captured and oxidized by the electron-deficient centers.The obtained electrons from pollutants are diverted to the electron-rich centers through bonding bridges.This process breaks through the classic Fenton mechanism,and improves the performance and efficiency of pollutant removal in a wide pH range.Here,we provide a brief overview of Fenton's story and focus on combing the discovery and development of the DRC technology and mechanism in recent years.The construction of the DRC and its performance in the pollutant degradation and interfacial reaction process are described in detail.We look forward to bringing a new perspective to continue Fenton's story through research and development of DRC technology.

关键词： Dual reaction centers Fenton Pollutant utilization Electron transfer