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Experimental Point-to-Multipoint Plug-and-Play Measurement-Device-Independent Quantum Key Distribution Network

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Chinese Physics Letters 2019年第7期36卷 6-9页

作者： Guang-Zhao tang Shi-hai Sun Chun-yan Li College of Science National University of Defense Technology

Measurement-device-independent quantum key distribution(MDI-QKD) offers a practical way to realize a startype quantum network. Previous experiments on MDI-QKD networks can only support the point-to-point communication. We experimentally demonstrate a plug-and-play MDI-QKD network which can support the pointto-multipoint communication among three users. Benefiting from the plug-and-play MDI-QKD architecture,the whole network is automatically stabilized in spectrum, polarization, arrival time, and phase reference. The users only need the encoding devices, which means that the hardware requirements are greatly reduced. Our experiment shows that it is feasible to establish a point-to-multipoint MDI-QKD network.

关键词： Measurement-device-independent practical way to realize multipoint MDI-QKD network

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PAHs胁迫对菜心品质及其解毒系统的影响

南方农业学报 2017年第6期48卷 1036-1041页

作者：龙明华巫桂芬梁勇生申海燕龙彪唐璇李朋欣张慧娜广西大学南宁530004 南宁市蔬菜研究所南宁530000 广西农业职业技术学院南宁530007

【目的】探讨多环芳烃(PAHs)胁迫对菜心品质及其解毒系统的影响,了解PAHs对菜心的胁迫机理,为保障蔬菜质量安全提供参考依据。【方法】利用16种PAHs胁迫菜心,检测各处理菜心的单株鲜重、叶绿素、可溶性糖、可溶性蛋白、维生素C(Vc)和粗... 详细信息

【目的】探讨多环芳烃(PAHs)胁迫对菜心品质及其解毒系统的影响,了解PAHs对菜心的胁迫机理,为保障蔬菜质量安全提供参考依据。【方法】利用16种PAHs胁迫菜心,检测各处理菜心的单株鲜重、叶绿素、可溶性糖、可溶性蛋白、维生素C(Vc)和粗纤维含量及超氧化物歧化酶(SOD)、过氧化氢酶(CAT)、抗坏血酸过氧化物酶(APX)、过氧化物酶(POD)和多酚氧化酶(PPO)活性的变化情况,分析各品质指标和相关酶活性与PAHs的关系。【结果】900.0μg/L PAHs胁迫使菜心单株鲜重降低12.65%;300.0~900.0μg/L PAHs胁迫使菜心Vc和叶绿素含量降低,粗纤维含量增加,导致色泽改变、口感变差,但可增加菜心的可溶性蛋白含量,启动菜心机体免疫系统;低浓度(300.0μg/L)PAHs可致菜心的可溶性糖含量降低,口感变差。PAHs胁迫使菜心相关酶活性发生上调或下调作用,进而解除PAHs胁迫,其中,SOD活性降低;CAT活性呈先降低后升高变化趋势,但升幅或降幅小于对照(CK);POD活性随着胁迫时间延长而降低,表明CAT与POD在功能上共同承担了部分解毒功能;600.0μg/L PAHs可促进APX活性增强;PPO活性呈先升后降变化趋势,有利于机体实现自我修复过程。【结论】在PAHs胁迫下,菜心品质变差;低浓度(300.0μg/L)PAHs胁迫可提高其CAT和POD活性,中浓度(600.0μg/L)PAHs胁迫有利于提高SOD活性,以降低蔬菜体内PAHs积累。

关键词：菜心 PAHs 品质酶活解毒系统

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英语教学中跨文化交际教学的策略思考

江西农业大学学报（社会科学版） 2003年第1期2卷 128-130页

作者：郑海燕汤永红江西金融职工大学文化基础部江西南昌330043 江西农业大学外语系江西南昌330045

论述了跨文化交际的内容以及在英语教学中实施跨文化交际教学的必要性。

关键词：英语教学跨文化交际跨文化交际教学教学策略教学方法教师素养语用差异训练材料课外活动

Narrative Graph:Telling Evolving Stories Based on Event-centric Temporal Knowledge Graph

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Journal of Systems Science and Systems Engineering 2023年第2期32卷 206-221页

作者： Zhihua yan Xijin tang Academy of Mathematics and Systems Science Chinese Academy of SciencesBeijing100190China School of Management Science and Engineering Shanxi University of Finance and EconomicsTaiyuan030006China University of Chinese Academy of Sciences Beijing100039China

As the main channel for people to obtain information and express their opinions,online media generate a huge amount of unstructured news documents every day and make it difficult for people to perceive major societal events and grasp the evolution of *** studies on storyline generation are generally based on document clustering without considering event arguments and relations between ***-centric knowledge graph has been used to facilitate the construction of news documents to form structured event *** some studies have attempted to construct timelines based on event-centric knowledge graphs,it is difficult for timelines to depict the complex structures of event *** this paper,we try to represent news documents as an event-centric knowledge graph,and compress the whole knowledge graph into salient complex events in temporal order to generate storylines named narrative *** first collect news documents from news platforms,construct an event ontology,and build an event-centric knowledge graph with temporal *** neural network is used to detect events,while BERT fine-tuning is leveraged to identify temporal relations between ***,a novel generation framework of narrative graph with constraints of coherence and coverage is *** addition,a case study is implemented to demonstrate how to utilize narrative graph to analyze real-world *** experiment results show that our approach significantly outperforms the baseline approaches.

关键词： Storyline event-centric knowledge graph event evolution community detection

Three-Step Predictor-Corrector of Exponential Fitting Method for Nonlinear Schroedinger Equations

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Communications in Theoretical Physics 2005年第3X期44卷 435-439页

作者： tang Chen ZHANG Fang yan hai-Qing CHEN Zhan-Qing LUO Tao Department of Applied Physics University of Tianjin Tianjin 300072 China Department of Mechanical Engineering and Automation Harbin Institute of Technology Harbin China

We develop the three-step explicit and implicit schemes of exponential fitting methods. We use the three- step explicit exponential fitting scheme to predict an approximation, then use the three-step implicit exponential fitting scheme to correct this prediction. This combination is called the three-step predictor-corrector of exponential fitting method. The three-step predictor-corrector of exponential fitting method is applied to numerically compute the coupled nonlinear Schroedinger equation and the nonlinear Schroedinger equation with varying coefficients. The numerical results show that the scheme is highly accurate.

关键词： coupled nonlinear Shroedinger equation nonlinear Schroedinger equation with varying coefficients exponential fitting method solitons

A Class of New Special Solution of Nonlinear Diffusion Equation

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Acta Mathematicae Applicatae Sinica 2016年第2期32卷 437-446页

作者： yan tang College of Mathematics and Statistics Chongqing Technology and Business University

One of the most interesting problems of nonlinear differential equations is the construction of partial solutions. A new method is presented in this paper to seek special solutions of nonlinear diffusion equations. This method is based on seeking suitable function to satisfy Bernolli equation. Many new special solutions are obtained.

关键词： Nonlinear diffusion equation explicit solution auxiliary function

Enhanced Surface Mechanical Properties and Microstructure Evolution of Commercial Pure Titanium Under Electropulsing-Assisted Ultrasonic Surface Rolling Process

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Acta Metallurgica Sinica(English Letters) 2018年第12期31卷 1272-1280页

作者： Yong-Da Ye Xiao-Pei Li Zhi-yan Sun hai-Bo Wang Guo-Yi tang Advanced Materials Institute Graduate School at ShenzhenTsinghua University School of Materials Science and Engineering Tsinghua University

The effects of electropulsing-assisted ultrasonic surface rolling process on surface mechanical properties andmicrostructure evolution of commercial pure titanium were investigated. It was found that the surface mechanical prop-erties were significantly enhanced compared to traditional ultrasonic surface rolling process （USRP）, leading to smallersurface roughness and smoother morphology with fewer cracks and defects. Moreover, surface strengthened layer wasremarkably enhanced with deeper severe plastic deformation layer and higher surface hardness. Remarkable enhancementsof surface mechanical properties may be related to the gradient refined microstructure, the enhanced severe plasticdeformation layer and the accelerated formation of sub-boundaries and twins induced by coupling effects of USRP andelectropulsing. The primary intrinsic reasons for these improvements may be attributed to the thermal and athermal effectscaused by electropulsing treatment, which would accelerate dislocation mobility and atom diffusion.

关键词： Electropulsing-assisted ultrasonic surface rolling process (EP-USRP) Commercial pure titanium Roughness Hardness Microstructure evolution

A FEM-DFN model for the interaction and propagation of multi-cluster fractures during variable fluid-viscosity injection in layered shale oil reservoir

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Petroleum Science 2022年第6期19卷 2796-2809页

作者： Chu-Hao Huang hai-yan Zhu Jian-Dong Wang Jian Han Guang-Qing Zhou Xuan-He tang State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Chengdu University of TechnologyChengdu610059SichuanPR China Petroleum Engineering Technology Research Institute Shengli Oilfield CompanySINIOPECDongying257000ShandongPR China Chongqing Gas Field Southwest Oil and Gas Field CompanyPetro ChinaChongqing400021PR China

To investigate the height growth of multi-cluster fractures during variable fluid-viscosity fracturing in a layered shale oil reservoir,a two-dimensional finite element method(FEM)-discrete fracture network(DFN)model coupled with flow,stress and damage is proposed.A traction-separation law is used to describe the mixed-mode response of the damaged adhesive fractures,and the cubic law is used to describe the fluid flow within the *** rock deformation is controlled by the in-situ stress,fracture cohesion and fluid pressure on the hydraulic fracture *** coupled finite element equations are solved by the explicit time difference *** effects of the fracturing treatment parameters including fluid viscosity,pumping rate and cluster spacing on the geometries of multifractures are *** results show that variable fluid-viscosity injection can improve the complexity of the fracture network and height of the main fractures *** pumping rate of15 m^(3)/min,variable fluid-viscosity of 3-9-21-36-45 mPa s with a cluster spacing of 7.5 m is the ideal treatment *** field application shows that the peak daily production of the application well with the optimized injection procedu re of variable fluid-viscosity fracturing is 171 tons(about 2.85 times that of the adjacent well),which is the highest daily production record of a single shale oil well in China,marking a strategic breakthrough of commercial shale oil production in the Jiyang Depression,Shengli *** variable fluid-viscosity fracturing technique is proved to be very effective for improving shale oil production.

关键词： Shale oil reservoir FEM-DFN model Fracture propagation Variable fluid-viscosity injection Bedding planes

Active flow control using machine learning:A brief review

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Journal of Hydrodynamics 2020年第2期32卷 247-253页

作者： Feng Ren hai-bao Hu Hui tang Research Center for Fluid-Structure Interactions Department of Mechanical EngineeringThe Hong Kong Polytechnic UniversityHong KongChina School of Marine Science and Technology Northwestern Polytechnical UniversityXi’an710072China

Nowadays the rapidly developing artificial intelligence has become a key solution for problems of diverse disciplines,especially those involving big *** in these areas also attract researchers from the community of fluid mechanics,especially in the field of active flow control(AFC).This article surveys recent successful applications of machine learning in AFC,highlights general ideas,and aims at offering a basic outline for those who are interested in this specific *** this short review,we focus on two methodologies,i.e.,genetic programming(GP)and deep reinforcement learning(DRL),both having been proven effective,efficient,and robust in certain AFC problems,and outline some future prospects that might shed some light for relevant studies.

关键词： Active flow control(AFC) machine learning genetic programming(GP) deep reinforcement learning(DRL)