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Community diversity and distribution of ammonia-oxidizing archaea in marsh wetlands in the black soil zone in North-east China

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Frontiers of Environmental Science & Engineering 2019年第4期13卷 123-138页

作者： Chunhong Chen hong liang Dawen Gao State Key Laboratory of Urban Water Resource and Environment Harbin Institute of TechnologyHarbin 150090China School of Environment Harbin Institute of TechnologyHarbin 150090China

Since its first detection, ammonia-oxidizing archaea (AOA) have been proven to be ubiquitous in aquatic and terrestrial ecosystems. In this study, two freshwater marsh wetlands- the honghe wetland and Qixinghe wetland - in the black soil zone in North-east China were chosen to investigate the AOA community diversity and distribution in wetland soils with different vegetation and depth. In the honghe wetland, two sampling locations were chosen as the dominant plant transited from Deyeuxia to Carex. In the Qixinghe wetland, one sample location that was dominated by Deyeuxia was chosen. Samples of each location were collected from three different depths, and Illumina MiSeq platform was used to generate the AOA amoA gene archive. The results showed that the AOA amoA genes in the soils of the two wetlands were affiliated with three lineages: Nitrososphaera, Nitrosotalea, and Nitrosopumilus clusters. The different dominant status of these AOA lineages indicated their differences in adapting to acidic habitat, oxygenic/hypoxic alternation, organic matter, and other environmental factors, suggesting high diversity among AOA in marsh soils. The main driver of the AOA community was pH, along with organic carbon and ammonium nitrogen, which also played an important role combined with many other environmental factors. Thus, soil physiochemical characteristics, rather than vegetation, were the main cause of AOA community diversity in the wetlands in the black soil zone in China.

关键词： Ammonia-oxidizing archaea amoA gene Freshwater marsh Diversity Distribution

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Analysis of dipole-like ultra high frequency RFID tags close to metallic surfaces

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第8期10卷 1217-1222页

作者： Ling-fei MO hong-jian ZHANG hong-liang ZHOU State Key Lab of Industrial Control Technology Department of Control Zhejiang University Hangzhou 310027 China

It is a challenge for passive RFID tags to be mounted on the surface of metal because the parameters of tag antennas,such as the impedance matching,the radiation efficiency and the radiation pattern,are seriously affected by the metallic *** paper presents the characteristics of the dipole-like antennas of ultra high frequency(UHF) radio frequency identification(RFID) tags that are placed close to metallic *** finite element method(FEM) and method of moment(MoM) were used to simulate the changes of the antenna parameters near the metallic *** typical dipole-like antennas close to the metallic surface,a closed loop antenna and a loaded meander antenna,were modeled,and the performance was *** was carried out and the results were in good agreement with the simulation,showing that a distance of 0.05λ～0.1λ(λ is the free space wavelength) from the metallic surface could make the dipole-like UHF RFID tag performance be acceptable.

关键词： Radio frequency identification (RFID) Tag Metallic surface Finite element method (FEM) Method of moment (MoM)

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N_2O emission from nitrogen removal via nitrite in oxic-anoxic granular sludge sequencing batch reactor

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Journal of Environmental Sciences 2014年第3期26卷 537-541页

作者： hong liang Jiaoling Yang Dawen Gao School of Forestry Northeast Forestry University State Key Laboratory of Urban Water Resource and Environment Harbin Institute of Technology

Bionitrification is considered to be a potential source of nitrous oxide （N2O） emissions, which are produced as a by-product during the nitrogen removal process. To investigate the production of N2O during the process of nitrogen removal via nitrite, a granular sludge was studied using a labscale sequence batch reactor operated with real-time control. The total production of N2O generated during the nitrification and denitrification processes were 1.724 mg/L and 0.125 mg/L, respectively, demonstrating that N2O is produced during both processes, with the nitrification phase generating larger amount. In addition, due to the NEO-N mass/oxidized ammonia mass ratio, it can be concluded that nitrite accumulation has a positive influence on N2O emissions. Results obtained from PCRDGGE analysis demonstrate that a specific Nitrosomonas microorganism is related to N2O emission.

关键词： nitrous oxidenitrite accumulation nitrification and denitrification biological nitrogen removalwastewater treatment

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A Degree Condition for Graphs Having All(a,b)-parity Factors

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Acta Mathematicae Applicatae Sinica 2024年第3期40卷 656-664页

作者： Hao-dong LIU hong-liang LU School of Mathematics and Statistics Xi'an Jiaotong UniversityXi'an 710049China

Let a and b be positive integers such that a≤b and a≡b(mod 2).We say that G has all(a,b)-parity factors if G has an h-factor for every function h:V(G)→{a,a+2,…,b-2,b} with b|V(G)| even and h(v)≡b(mod 2) for all v∈V(G).In this paper,we prove that every graph G with n≥2(b+1)(a+b) vertices has all(a,b)-parity factors if δ(G)≥(b^(2)-b)/a,and for any two nonadjacent vertices u,v ∈V(G),max{d_(G)(u),d_(G)(v)}≥bn/a+***,we show that this result is best possible in some sense.

关键词： degree condition all(a,b)-factors

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Novel two-dimensional transition metal chalcogenides created by epitaxial growth

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Science China(Physics,Mechanics & Astronomy) 2021年第10期64卷 23-37页

作者： hong-liang Lu Yu-Yang Zhang Xiao Lin hong-Jun Gao Institute of Physics and University of Chinese Academy of Sciences Chinese Academy of SciencesBeijing 100190China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of SciencesBeijing 100190China Songshan Lake Materials Laboratory Dongguan 523808China

Two-dimensional(2D) materials have been a very important field in condensed matter physics, materials science, chemistry, and electronics. In a variety of 2D materials, transition metal chalcogenides are of particular interest due to their unique structures and rich properties. In this review, we introduce a series of 2D transition metal chalcogenides prepared by epitaxial growth. We show that not only 2D transition metal dichalcogenides can be grown, but also the transition metal chalcogenides that do not have bulk counterparts, and even patterned transition metal chalcogenides can be fabricated. We discuss the formation mechanisms of the novel structures, their interesting properties, and potential applications of these 2D transition metal chalcogenides. Finally, we give a summary and some perspectives on future studies.

关键词： 2D materials transition metal chalcogenides epitaxial growth

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Paradigm shifts of life science research in China:Challenges and coping strategies

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Science Bulletin 2024年第22期69卷 3470-3473页

作者： hong-liang Zhang Department of Life Sciences National Natural Science Foundation of ChinaBeijing 100085China

Life sciences,a group of disciplines dedicated to exploring biological phenomena and elucidating the principles underlying biological activities,span multiple levels of research ranging from molecules to cells,tissues,organs,individuals,and *** represents one of the most dynamic frontiers in contemporary scientific research[1].In recent years,China has made remarkable progress in scientific research investment and ***’s basic research funds reached 221.2 billion yuan in 2023,representing a 9.3%increase over the previous year.

关键词： funds investment frontier

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Effective Response of Nonlinear Composite under External AC and DC Electric Field

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Communications in Theoretical Physics 2005年第4X期44卷 731-734页

作者： LIU Ye liang Fang-Chu SHEN hong-liang Institute of Oceanology the Chinese Academy of Sciences Qingdao 266071 China Graduate School of the Chinese Academy of Sciences Beijing 100039 China Department of Mathematics Ningbo University of Technology Ningbo 315016 China Hebei Province Tobacco Quality Testing Station of Hebei Tobacco Company Shijiazhuang 050051 China

A perturbation method is used to study effective response of nonlinear Kerr composites, which are subject to the constitutive relation of electric displacement and electric field, Dα=εαE＋xα｜E｜^2E. Under the external AG and DC electric field Eapp = Eα（1 ＋ sinωt）, the effective nonlinear responses and local potentials are induced by the cubic nonlinearity of Kerr materials at all harmonics. As an example in three dimensions, we have investigated this kind of nonlinear composites with spherical inclusions embedded in a host. At all harmonic frequencies, the potentials in inclusion and host regions are derived. Furthermore, the formulae of the effective linear and nonlinear responses are given in the dilute Iimit.

关键词： nonlinear composite dielectric response AC electric field

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Partial Isometries and an Invariant of C＊-algebras

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Acta Mathematica Sinica,English Series 2011年第4期27卷 799-806页

作者： hong liang YAO Xiao Chun FANG School of Science Nanjing University of Science and Technology Nanjing 210014 P. R. China Department of Mathematics Tongji University Shanghai 200092 P. R. China

In this paper, we will discuss some properties of biprojection-commutative elements which are relevant to the classification of certain infinite C＊-algebras,, and define an important invariant s（A） of C＊-algebra A as well as give some basic properties with regard to s（A）. Moreover we prove that the invariant s（A） has continuity.

关键词： Partial isometry C*-algebra K1-group

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Occurrence and distribution of phthalate esters (PAEs) in wetland sediments

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Journal of Forestry Research 2017年第6期28卷 1233-1240页

作者： He Wang hong liang Dawen Gao Center for Ecological Research Northeast Forestry University 26 Hexing Road Harbin 150040 People’s Republic of China School of Forestry Northeast Forestry University 26 Hexing Road Harbin 150040 People’s Republic of China

This study investigated the occurrence and distribution of 15 phthalate esters (PAEs) in sediments collected from Qixinghe wetlands, northeast China. Total concentration of PAEs in all sediments ranged from 128.41 to 502.79 mu g kg(-1), with the mean value of 284.61 mu g kg(-1). PAEs significantly differed among wetland types; the average PAEs concentration of surface sediments were as follows: Phragmites australis wetland (PAW, 419.87 +/- 73.61 mu g kg(-1)) > Carex lasiocarpa wetland (CLW, 304.18 +/- 56.47 mu g kg(-1)) > Deyeuxia angustifolia wetland (DAW, 129.78 +/- 18.24 mu g kg(-1)). Dimethyl phthalate (DMP), diisobutyl phthalate, di-n-butyl phthalate, and di-(2-ethylhexyl) phthalate (DEHP) were found in all sediments, DEHP was the most abundant PAEs congeners with concentrations varying from 37.62 to 294.9 mu g kg(-1). DMP and DEHP exhibited relatively higher concentrations in CLW and PAW wetlands than in DAW, indicating that the different deoxidization and biodegradation conditions could have important implications for the distribution patterns of PAEs in wetland sediments. The variation of PAEs concentrations in horizontal and vertical sediments with wetland types could be attributed to the migration of contaminants by surface water, groundwater and atmospheric deposition. The occurrence and distribution of PAEs in wetlands also suggests that contamination in natural ecosystems should not be overlooked.

关键词： Occurrence and distribution Wetlands Sediments Phthalate esters

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A mechanism of defect-enhanced phase transformation kinetics in lithium iron phosphate olivine

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npj Computational Materials 2019年第1期5卷 102-110页

作者： liang hong Kaiqi Yang Ming Tang Department of Materials Science&NanoEngineering Rice UniversityHoustonTX 77005USA

Antisite defects are a type of point defect ubiquitously present in intercalation compounds for energy storage *** they are often considered a deleterious feature,here we elucidate a mechanism of antisite defects enhancing lithium intercalation kinetics in LiFePO_(4) by accelerating the FePO_(4)→LiFePO_(4) phase *** FeLi antisites block Li movement along the[010]migration channels in LiFePO_(4),phase-field modeling reveals that their ability to enhance Li diffusion in other directions significantly increases the active surface area for Li intercalation in the surface-reaction-limited kinetic regime,which results in order-of-magnitude improvement in the phase transformation rate compared to defect-free *** defects also promote a more uniform reaction flux on(010)surface and prevent the formation of current hotspots under galvanostatic(dis)charging *** analyze the scaling relation between the phase boundary speed,Li diffusivity and particle dimensions and derive the criteria for the co-optimization of defect content and particle geometry.A surprising prediction is that(100)-oriented LiFePO_(4) plates could potentially deliver better performance than(010)-oriented plates when the Li intercalation process is *** work suggests tailoring antisite defects as a general strategy to improve the rate performance of phase-changing battery compounds with strong diffusion anisotropy.

关键词： transformation defect kinetics

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