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Spatial–temporal distribution and potential ecological risk assessment of nonylphenol and octylphenol in riverine outlets of Pearl River Delta, China

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Journal of Environmental Sciences 2014年第11期26卷 2340-2347页

作者： Ru Chen Pinghe Yin ling Zhao Qiming Yu Aihua Hong Shunshan duan Department of Chemistry College of Life Science and Technology Jinan University Center of Analysis and Test Department of Environmental Engineering Jinan University Griffith School of Engineering Griffith University Nathan Campus Brisbane Queensland 4111 Australia Center of Analysis and Test Guangzhou Research Center of Hydrobiology College of Life Science and TechnologyJinan University

The aquatic environments of the Pearl River Delta in Southern China are subjected to contamination with various industrial chemicals from local industries. In this paper, the occurrence, seasonal variation and spatial distribution of alkylphenol octylphenol （OP） and nonylphenol （NP） in fiver surface water and sediments in the runoff outlets of the Pearl River Delta were investigated. NP and OP were detected in all water and sediment samples and their mean concentrations in surface water during the dry season ranged from 810 to 3366 ng/L and 85.5 to 581 ng/L, respectively, and those in sediments ranged from 14.2 to 95.2 ng/g dw and 0.4 to 3.0 ng/g dw, respectively. In surface water, much higher concentrations were detected in the dry season than those in the wet season. In sediments, the concentrations in the dry season were also mostly higher. High concentrations of NP and OP were found in Humen outlet, likely due to high levels of domestic and industrial wastewater discharges. An ecological risk assessment with the use of hazard quotient （HQ） was also carried out and the HQvalues ranged from 3.6 × 10^-5 to 35 and 64% of samples gave a HQ 〉 1, indicating that the current levels of NP and OP pose a significant risk to the relevant aquatic organisms in the region.

关键词： Nonylphenol Octylphenol Environmental concentration Ecological risk assessment Pearl River Delta

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Multi-Material and Multiscale Topology Design Optimization of Thermoelastic Lattice Structures

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Computer Modeling in Engineering & Sciences 2022年第2期130卷 967-986页

作者： jun Yan Qianqian Sui Zhirui Fan Zunyi duan StateKey Laboratory of Structural Analysis for Industrial Equipment Department of EngineeringMechanicsInternational Research Center for Computational MechanicsDalian University of TechnologyDalian116024China Ningbo Research Institute of Dalian University of Technology Ningbo315016China Institute of Structural Health Monitoring and Control School of MechanicsCivil Engineering&ArchitectureNorthwestern Polytechnical UniversityXi’an710072China

This study establishes amultiscale andmulti-material topology optimization model for thermoelastic lattice structures(TLSs)consideringmechanical and thermal loading based on the ExtendedMultiscale Finite ElementMethod(EMsFEM).The corresponding multi-material and multiscale mathematical formulation have been established with minimizing strain energy and structural mass as the objective function and constraint,*** Solid Isotropic Material with Penalization(SIMP)interpolation scheme has been adopted to realize micro-scale multi-material selection of truss *** modified volume preserving Heaviside function(VPHF)is utilized to obtain a clear 0/1 material of truss *** with the classic topology optimization of single-material TLSs,multi-material topology optimization can get a better structural design of the *** effects of temperatures,size factor,and mass fraction on optimization results have been presented and discussed in the numerical examples.

关键词： Multi-material design optimization thermoelastic lattice structure multiscale topology optimization mass constraint strain energy

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MicroRNA miR-2765-3p regulates reproductive diapause by targeting FoxO in Galeruca daurica

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Insect Science 2023年第2期30卷 279-292页

作者： Tian-Feng duan ling Li Hai-Chao Wang Bao-Ping Pang Research Center for Grassland Entomology Inner Mongolia Agricultural UniversityHohhotChina

The forkhead box O(FoxO),as a conserved transcription factor,plays an indispensable role in regulating insect ***,how FoxO is regulated to control diapause in insects remains *** this study,we discovered functional binding sites for miR-2765-3p in the 3′untranslated region of FoxO in Galeruca *** luciferase reporter assay showed that miR-2765-3p targeted FoxO and suppressed its *** expression profiles of miR-2765-3p and FoxO displayed opposite patterns during the female developmental *** of miR-2765-3p by the injection of the miR-2765-3p agomir into adult females reduced FoxO expression,leading to the suppression of lipid accumulation,promotion of ovarian development,and inhibition of reproductive *** is similar to the phenotype that results from the depletion of FoxO by injecting dsFoxO into adult *** addition,the repression of miR-2765-3p by injecting the miR-2765-3p antagomir increased the FoxO transcript level,leading to the stimulation of lipid accumulation,depression of ovarian development,and induction of reproductive diapause.A hormone injection assay showed that the juvenile hormone(JH)agonist(methoprene)upregulated miR-2765-3p and downregulated ***,injecting methoprene rescued ovarian development defects associated with miR-2765-3p *** findings indicate that the JH/miR-2765-3p/FoxO axis plays a vital role in the regulation of reproductive diapause in ***.

关键词： diapause FoxO Galeruca daurica juvenile hormone microRNA

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Effect of the formation process of transient liquid phase (TLP) on the interface structure of TiAl joints

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Journal of University of Science and Technology Beijing 2005年第5期12卷 431-435页

作者： Huiping duan jun Luo Karl-Heinz Bohm Mustafa Kogak School of Materials Science and Technology Beijing University of Aeronautics and Astronautics Beijing 100083 China Institute for Materials Research GKSS Research Center Geesthacht 21502 Germany

TiAl has been joined employing the transient liquid phase （TLP） bonding with Ti combined with Cu, Ni or Fe foils. Experimental results showed that though the interface structures of the joints are quite different, all the joined zones are composed of five sublayers, i.e. two diffusion zones, two interfacial zones and an interlayer. It has been convinced that the formation process of the transient liquid phase controls the diffusion behavior of melting point depressant （MPD） Cu, Ni, and Fe atoms, which leads to form different interface structures of the joints.

关键词： TiAl transient liquid phase (TLP) bonding interface

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Integrated design optimization of composite frames and materials for maximum fundamental frequency with continuous fiber winding angles

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Acta Mechanica Sinica 2018年第6期34卷 1084-1094页

作者： Zunyi duan jun Yan Ikjin Lee Jingyuan Wang Tao Yu State Key Laboratory of Structural Analysis for Industrial Equipment Department of Engineering MechanicsInternational Research Center for Computational MechanicsDalian University ofTechnologyDalian 1 16024China Department of Mechanical Engineering Korea Advanced Institute of Science and TechnologyDaejeon 34141Republic of Korea Harbin Electric Power Equipment Company Limited Harbin Electric Corporation LimitedHarbin 150028China

Fiber reinforced composite frame structure is an ideal lightweight and large-span structure in the fields of aerospace,satellite and wind *** fundamental frequency is one of key indicators in the design requirement of the composite frame since structural resonance can be effectively avoided with the increase of the fundamental *** by the concept of integrated design optmization of composite frame structures and materials,the design optimization for the maximum structural fundamental frequency of fiber reinforced frame structures is *** optimization model oriented at the maximum structural fundamental frequency under a composite material volume constraint is *** kinds of independent design variables are optimized,in which one is variables represented structural topology,the other is variables of continuous fiber winding *** analysis of the frequency with respect to the two kinds of independent design variables is implemented with the semi-analytical sensitivity *** representative examples in the manuscript demonstrate that the integrated design optimization of composite structures can effectively explore coupled effects between structural configurations and material properties to increase the structural fundamental *** proposed integrated optimization model has great potential to improve composite frames structural dynamic performance in aerospace industries.

关键词： Integrated optimization Maximum fundamental frequency Composite frame structures Continuous fiber winding angle Semi-analytical sensitivity analysis

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Day-ahead P2P Energy Sharing Strategy Among Energy Hubs Considering Flexibility of Energy Storage and Loads

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CSEE Journal of Power and Energy Systems 2024年第3期10卷 1105-1118页

作者： Penghua Li Wanxing Sheng Qing duan jun Liang Cunhao Zhu China Electric Power Research Institute Beijing 100192China School of Engineering Cardiff UniversityUK IEEE

Multi-energy systems are one of the key technologies to tackle energy crisis and environmental *** energy hub(EH)is a minimum multi-energy *** of multiple EHs through energy routers(ERs)can realize mutual energy *** paper proposes a peer-to-peer(P2P)energy sharing strategy between EHs including ERs in an interconnected system,which is divided into two *** the lower level,a method of determining the charging/discharging constraints of energy storage devices is *** on the Lyapunov optimization method,virtual queues are used to model the energy storage devices and flexible loads in the *** objective is to minimize the overall operating cost of the interconnected *** the upper level,a non-cooperative game model is introduced to minimize the cost of purchasing power from other EHs for each EH.A best response-based method is adapted to find the Nash *** simulation outcomes demonstrate that application of the proposed strategy can reduce operating costs of an interconnected system and each *** basis of a real-world dataset of interconnected EHs,both analytical and numerical results show the effectiveness of the proposed strategy.

关键词： Energy hub energy router Lyapunov optimization non-cooperative game peer to peer virtual queue

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Improved quadratic isogeometric element simulation of one-dimensional elastic wave propagation with central difference method

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Applied Mathematics and Mechanics(English Edition) 2018年第5期39卷 703-716页

作者： Weibin WEN Shibin LUO Shengyu duan jun LIANG Daining FANG School of Civil Engineering Central South University State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology College of Engineering Peking University

Two improved isogeometric quadratic elements and the central difference scheme are used to formulate the solution procedures of transient wave propagation prob- lems. In the proposed procedures, the lumped matrices corresponding to the isogeomet- ric elements are obtained. The stability conditions of the solution procedures are also acquired. The dispersion analysis is conducted to obtain the optimal Courant-Friedrichs- Lewy （CFL） number or time-step sizes corresponding to the spatial isogeometric elements. The dispersion analysis shows that the isogeometric quadratic element of the fourth-order dispersion error （called the isogeometric analysis （IGA）-f quadratic element） provides far more desirable numerical dissipation/dispersion than the element of the second-order dis- persion error （called the IGA-s quadratic element） when appropriate time-step sizes are selected. The numerical simulations of one-dimensional （1D） transient wave propagation problems demonstrate the effectiveness of the proposed solution procedures.

关键词： structural dynamics wave propagation isogeometric analysis (IGA) numerical dissipation time integration

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Concentrating partially entangledW-class states on nonlocal atoms using low-Q optical cavity and linear optical elements

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Science China(Physics,Mechanics & Astronomy) 2016年第10期59卷 42-48页

作者： Cong Cao Xi Chen YuWen duan ling Fan Ru Zhang TiejunWang Chuan Wang State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications School of Ethnic Minority Education Beijing University of Posts and Telecommunications School of Science Beijing University of Posts and Telecommunications

Entanglement plays an important role in quantum information science, especially in quantum communications. Here we present an efficient entanglement concentration protocol(ECP) for nonlocal atom systems in the partially entangled W-class states, using the single-photon input-output process regarding low-Q cavity and linear optical elements. Compared with previously published ECPs for the concentration of non-maximally entangled atomic states, our protocol is much simpler and more efficient as it employs the Faraday rotation in cavity quantum electrodynamics(QED) and the parameter-splitting method. The Faraday rotation requires the cavity with low-Q factor and weak coupling to the atom, which makes the requirement for entanglement concentration much less stringent than the previous methods, and achievable with current cavity QED techniques. The parameter-splitting method resorts to linear-optical elements only. This ECP has high efficiency and fidelity in realistic experiments, and some imperfections during the experiment can be avoided efficiently with currently available techniques.

关键词： entanglement concentration W-class states cavity QED linear optical elements

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Finite-size analysis of continuous-variable quantum key distribution with entanglement in the middle

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Chinese Physics B 2019年第1期28卷 232-239页

作者： Ying Guo Yu Su Jian Zhou ling Zhang duan Huang School of Physics and Information Science Hunan Normal UniversityChangsha 410006China School of Automation Central South UniversityChangsha 410083China

Continuous-variable quantum key distribution(CVQKD) protocols with entanglement in the middle(EM) enable long maximal transmission distances for quantum communications. For the security analysis of the protocols, it is usually assumed that Eve performs collective Gaussian attacks and there is a lack of finite-size analysis of the protocols. However,in this paper we consider the finite-size regime of the EM-based CVQKD protocols by exposing the protocol to collective attacks and coherent attacks. We differentiate between the collective attacks and the coherent attacks while comparing asymptotic key rate and the key rate in the finite-size scenarios. Moreover, both symmetric and asymmetric configurations are collated in a contrastive analysis. As expected, the derived results in the finite-size scenarios are less useful than those acquired in the asymptotic regime. Nevertheless, we find that CVQKD with entanglement in the middle is capable of providing fully secure secret keys taking the finite-size effects into account with transmission distances of more than 30 km.

关键词： continuous-variable quantum key distribution entanglement in the middle finite-size coherent attack

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Experimental and numerical study of hypervelocity impact damage on composite overwrapped pressure vessels

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Defence Technology（防务技术） 2024年第1期31卷 58-72页

作者： Yong-Pan duan Run-Qiang Chi Bao-jun Pang Yuan Cai Hypervelocity Impact Research Center Harbin Institute of TechnologyHarbin150080China College of Science Heilongjiang University of Science and TechnologyHarbin 150022China

Ground-based tests are important for studying hypervelocity impact(HVI)damage to spacecraft pressure vessels in the orbital debris *** analyzed the damage to composite overwrapped pressure vessels(COPVs)in the HVI tests and classified the damage into non-catastrophic damage and catastrophic *** proposed a numerical simulation method to further study non-catastrophic damage and revealed the characteristics and mechanisms of non-catastrophic damage affected by impact conditions and internal *** fragments of the catastrophically damaged COPVs were collected after the *** crack distribution and propagation process of the catastrophic ruptures of the COPVs were *** findings contribute to understanding the damage characteristics and mechanisms of COPVs by HVIs.

关键词： Orbital debris Hypervelocity impact Composite overwrapped pressure vessels Damage mechanisms

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