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Interactions between invasive Eurasian watermilfoil and native water stargrass in Cayuga Lake, NY, USA

Journal of Plant Ecology 2014年第6期7卷 499-508页

作者： bin zhu Samuel E.Georgian Department of Biology University of Hartford200 Bloomfield AvenueWest HartfordCT 06117USA Department of Biology Temple University1900 N 12 StreetPhiladelphiaPA 19122USA

Aims Eurasian watermilfoil(Myriophyllum spicatum L.)is a common invasive plant in American lakes and has many negative impacts on invaded *** decline of this plant at the north-ern end of Cayuga Lake in the New York State has occurred since the 1980s,with a much smaller magnitude of decline of Eurasian watermilfoil at the southern end(Johnson et al.2000)During the same period,increases in the abundance of native plants,partic-ularly water stargrass(Heteranthera dubia(Jacq.)MacMill.),have been observed(Johnson et al.(1998))We aimed to investigate the mechanisms responsible for the decline of Eurasian watermilfoil and evaluate the responses of co-occurring plants at the two ends of Cayuga Lake over *** hypothesized that plant interactions might have contributed to the drastic decline of Eurasian watermil-foil,particularly allelopathy by native water *** A lake survey was conducted to assess distribution and abundance of plant communities at the northern end and the southern end of Cayuga ***,two sets of greenhouse experiments were conducted to investigate the interactions between invasive Eurasian watermilfoil and native water stargrass.A competition experiment evaluated intra-versus inter-specific competition among plants grown together;an allelopathy experiment examined the responses of plants to each other’s *** Findings The lake survey showed that water stargrass was extremely abun-dant at the northern end,whereas Eurasian watermilfoil was sparse at the northern end but one of the most common species at the southern *** survey also revealed that water stargrass was more abundant than Eurasian watermilfoil at sites where the two species coexisted in the *** from greenhouse experi-ments revealed no effects of Eurasian watermilfoil on water star-grass ***,Eurasian watermilfoil biomass was reduced by 46%when treated with high concentration of water stargrass *** is likely d

关键词： allelopathy biological invasion plant interactions space competition submerged macrophytes

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Entanglement teleportation via a couple of quantum channels in Ising–Heisenberg spin chain model of a heterotrimetallic Fe–Mn–Cu coordination polymer

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Chinese Physics B 2019年第12期28卷 105-112页

作者： Yi-Dan Zheng zhu Mao bin Zhou Department of Physics Hubei UniversityWuhan 430062China

We investigate the teleportation of an entangled state via a couple of quantum channels, which are composed of a spin-1/2 Heisenberg dimer in two infinite Ising–Heisenberg chains. The heterotrimetallic coordination polymer CuⅡMnⅡ(L1)][FeⅢ(bpb)(CN)2]·ClO4·H2O(abbreviated as Fe–Mn–Cu) can be regarded as an actual material for this *** apply the transfer-matrix approach to obtain the density operator for the Heisenberg dimer and use the standard teleportation protocol to derive the analytical expression of the density matrix of the output state and the average fidelity of the entanglement teleportation. We study the effects of the temperature T, anisotropy coupling parameter △, Heisenberg coupling parameter J2 and external magnetic field h on the quantum channels. The results show that anisotropy coupling? and Heisenberg coupling J2 can favor the generation of the output concurrence and expand the scope of the successful average fidelity.

关键词： entanglement teleportation Ising–Heisenberg chain transfer-matrix approach concurrence

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Efficient polysulfides conversion on Mo_(2)CT_(x)MXene for highperformance lithium–sulfur batteries

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Rare Metals 2022年第1期41卷 311-318页

作者： Qi zhu Hong-Fei Xu Kai Shen Yong-Zheng Zhang bin Li Shu-bin Yang School of Materials Science and Engineering Beihang UniversityBeijing 100191China

The severe shuttle effect and sluggish redox kinetics of polysulfides hinder the application of lithium–sulfur ***,delaminated Mo_(2)CT_(x) MXene nanosheets are derived by chemical etching approach and further applied as a sulfur host for sulfur spheres(S@Mo_(2)CT_(x)).In the MXene encapsulated architecture,the external MXene nanosheets not only immobilize the soluble polysulfides by strong chemical adsorption but also efficiently catalyze the liquid–liquid conversion and liquid–solid nucleation process of lithium *** addition,the S@Mo_(2)CT_(x) electrode delivered fast charge and lithium-ion transport due to the superior electric conductivity and low lithiumion diffusion energy barrier of MXene *** a result,the S@Mo_(2)CT_(x) electrode exhibits a high reversible capacity of 918 mAh·g^(-1) at 1.0C with good cycling stability and a high areal capacity of 7.0 mAh·cm^(-2) with sulfur loading of 7.4 mg·cm^(-2) under a lean electrolyte condition.

关键词： lithium MXene electrode

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Phase Transition for a Mixed Spin-1／2 and Spin-sB System with a Transverse CrystalField

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Communications in Theoretical Physics 2004年第1期41卷 131-134页

作者： JIANGWei XIAOGui-bin WEIGuo-zhu DUAn ZHANGQi CollegeofSciences ShenyangUniversityofTechnologyShenyang110023China ComputerDepartmenttShenyangAdministrationInstitute~Shenyang110032~China CollegeofSciences NortheasternUniversityShenyang110006China

The critical behaviors of a mixed spin-1/2 and spin-sB Ising system with a transverse crystal field are studiedby use of the effective-field theory with correlations. The effect of the transverse crystal field on transition temperaturesis investigated numerically for the honeycomb (z = 3) and square (z = 4) lattices. The results show that there is notricritical point for the system.

关键词： Ising model transverse crystal field phase diagram

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Molecular Biological and Biochemical Studies Reveal New Pathways Important for Cotton Fiber Development

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Journal of Integrative Plant Biology 2007年第1期49卷 69-74页

作者： Yu Xu Hong-bin Li Yu-Xian zhu National Laboratory of Protein Engineering and Plant Genetic Engineering Peking University Beijing 100871 China

As one of the longest single-celled seed trichomes, fibers provide an excellent model for studying fundamental biological processes such as cell differentiation, cell expansion, and cell wall biosynthesis. In this review, we summarize recent progress in cotton functional genomic studies that characterize the dynamic changes in the transcriptomes of fiber cells. Extensive expression profilings of cotton fiber transcriptomes have provided comprehensive information, as quite a number of transcription factors and enzyme-coding genes have been shown to express preferentially during the fiber elongation period. Biosynthesis of the plant hormone ethylene is found significantly upregulated during the fiber growth period as revealed by both microarray analysis and by biochemical and physiological studies. It is suggested that genetic engineering of the ethylene pathway may improve the quality and the productivity of cotton lint. Many metabolic pathways, such as biosynthesis of cellulose and matrix polysaccharides are preferentially expressed in actively growing fiber cells. Five gene families, including proline-rich proteins （PRP）, arabinogalactan proteins （AGP）, expansins, tubulins and lipid transfer proteins （LTP） are activated during early fiber development, indicating that they may also be needed for cell elongation. In conclusion, we identify a few areas of future research for cotton functional genomic studies.

关键词： cotton fiber functional genomics plant hormone transcriptome transcription factors

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Implementation of the moving particle semi-implicit method on GPU

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Science China(Physics,Mechanics & Astronomy) 2011年第3期54卷 523-532页

作者： zhu XiaoSong CHENG Liang LU Lin TENG bin State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology Dalian 116023 China School of Civil and Resource Engineering The University of Western Australia Perth WA 6009 Australia Centre for Deepwater Engineering Dalian University of Technology Dalian 116024 China

The Moving Particle Semi-implicit (MPS) method performs well in simulating violent free surface flow and hence becomes popular in the area of fluid flow simulation. However, the implementations of searching neighbouring particles and solving the large sparse matrix equations (Poisson-type equation) are very time-consuming. In order to utilize the tremendous power of parallel computation of Graphics Processing Units (GPU), this study has developed a GPU-based MPS model employing the Compute Unified Device Architecture (CUDA) on NVIDIA GTX 280. The efficient neighbourhood particle searching is done through an indirect method and the Poisson-type pressure equation is solved by the Bi-Conjugate Gradient (BiCG) method. Four different optimization levels for the present general parallel GPU-based MPS model are demonstrated. In addition, the elaborate optimization of GPU code is also discussed. A benchmark problem of dam-breaking flow is simulated using both codes of the present GPU-based MPS and the original CPU-based MPS. The comparisons between them show that the GPU-based MPS model outperforms 26 times the traditional CPU model.

关键词： moving particle semi-implicit method (MPS) graphics processing units (GPU) compute unified device architecture (CUDA) neighbouring particle searching free surface flow

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Damping control for a target oscillation mode using battery energy storage

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Journal of Modern Power Systems and Clean Energy 2018年第4期6卷 833-845页

作者： Yongli zhu Chengxi LIU bin WANG Kai SUN Department of Electrical Engineering and Computer Science University of Tennessee

In this paper, a battery energy storage system(BESS) based control method is proposed to improve the damping ratio of a target oscillation mode to a desired level by charging or discharging the installed BESS using local measurements. The expected damping improvement by BESS is derived analytically for both a single-machineinfinite-bus system and a multi-machine system. This BESS-based approach is tested on a four-generator, twoarea power system. Effects of the power converter limit,response time delay, power system stabilizers and battery state-of-charge on the control performance are also investigated. Simulation results validate the effectiveness of the proposed approach.

关键词： Battery energy storage system(BESS) Battery Damping ratio Energy storage Power system oscillation State of charge(SOC)

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Pairing-Free ID-Based Key-Insulated Signature Scheme

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Journal of Electronic Science and Technology 2015年第1期13卷 33-38页

作者： Guo-bin zhu Hu Xiong Zhi-Guang Qin School of Computer Science and Engineering University of Electronic Science and Technology of China

Without the assumption that the private keys are kept secure perfectly, cryptographic primitives cannot be deployed in the insecure environments where the key leakage is inevitable. In order to reduce the damage caused by the key exposure in the identity-based（ID-based） signature scenarios efficiently, we propose an ID-based key-insulated signature scheme in this paper, which eliminates the expensive bilinear pairing operations. Compared with the previous work, our scheme minimizes the computation cost without any extra cost. Under the discrete logarithm（DL） assumption, a security proof of our scheme in the random oracle model has also been given.

关键词： Identity-based cryptography key-insulated random oracle mode signature

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Multi-sensing paradigm based urban air quality monitoring and hazardous gas source analyzing:a review

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Journal of Safety Science and Resilience 2021年第3期2卷 131-145页

作者： Zhengqiu zhu bin Chen Yong Zhao Yatai Ji College of Systems Engineering National University of Defense Technology(NUDT)410073109 Deya RoadKaifu DistrictChangsha CityHunan provinceChina Research Group of Multi-scale Networked Systems Informatics InstituteUniversity of Amsterdam(UvA)Science Park 904P.O.Box 943231096 XH AmsterdamNetherlands

Effectively monitoring urban air quality,and analyzing the source terms of the main atmospheric pollutants is important for public authorities to take air quality management *** works,such as long-term obser-vations by monitoring stations,cannot provide customized data services and in-time emergency response under urgent situations(gas leakage incidents).Therefore,we first review the up-to-date approaches(often machine learning and optimization methods)with respect to urban air quality monitoring and hazardous gas source *** bridge the gap between present solutions and practical requirements,we design a conceptual framework,namely MAsmed(Multi-Agents for sensing,monitoring,estimating and determining),to provide fine-grained concentration maps,customized data services,and on-demand emergency *** this framework,we leverage the hybrid design of wireless sensor networks(WSNs)and mobile crowdsensing(MCS)to sense urban air quality and relevant data(*** data,meteorological data,etc.);Using the sensed data,we can create a fine-grained air quality map for the authorities and relevant stakeholders,and provide on-demand source term estimation and source searching methods to estimate,seek,and determine the sources,thereby aiding decision-makers in emergency response(*** evacuation).In this paper,we also identify several potential opportunities for future research.

关键词： Urban air quality monitoring and source analyzing system MAsmed framework Wireless sensor networks Mobile crowdsensing Air quality management

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Seismic stability and permanent displacement of landfill along liners

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Science China(Technological Sciences) 2008年第4期51卷 407-423页

作者： CHEN YunMin GAO Deng zhu bin CHEN RenPeng MOE Key Laboratory of Soft Solis and Geoenvironmental Engineering Zhejiang UniversityHangzhou 310027China

The three-part wedge limit equilibrium method for seismic stability analysis of the landfill along liners is presented. The approximate solutions of the factor of safety and the yield acceleration coefficient are obtained. Parametric studies show that the interface strength of liners, the shear strength of waste and the height of retaining wall can influence the seismic stability of landfill along liners. The density and the shear wave velocity of the field waste are obtained by the borehole investigation and the spectral analysis of surface wave (SASW), respectively. The strain-dependent shear modulus and damping ratio of the artifical waste are obtained by the moderate-scale dynamic triaxial tests. The onedimensional (1D) equivalent linear dynamic response analysis is used to calculate the horizontal equivalent seismic coefficient-time history of the sliding landfill during earthquake. The seismic permanent displacement of the landfill along liners with different site conditons and heights is evaluated by the Newmark method. The catculated results show that ratio of ky /kmax, site conditions, the amplitude and frequency content of the bedrock motion can affect the seismic permanent displacement of the landfill along liners in some degree. Finally, the seismic stability and permanent displacements of three expanded configurations of a certain landfill case are analyzed.

关键词： landfill liner seismic stability permanent displacement Newmark method

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