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Conversion of nitrogen and carbon in enriched paddy soil by denitrification coupled with anammox in a bioelectrochemical system

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Journal of Environmental Sciences 2022年第1期34卷 197-207页

作者： luan Zhang Minghe Jiang Shungui Zhou Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation College of Resources and EnvironmentFujian Agriculture and Forestry UniversityFuzhou 350002China

The aim of this study is to investigate conversion of nitrogen and COD in enriched paddy soil by nitrification coupled with anammox process in a dual chamber bioelectrochemical *** paddy soil was enriched for denitrification coupled with anammox by microbial consortia and was acclimatized in the cathodic chamber of microbial fuel cells(MFCs).The bioelectrochemical systems were treated with different ammonium concentrations in the cathodic chamber:the MFC with low concentration ammonium(LA-MFC,50 mg/L ammonium),the MFC with medium concentration ammonium(MA-MFC,500 mg/L ammonium),and MFC with high concentration ammonium(HA-MFC,1000 mg/L ammonium),and the initial COD in the anodic chamber was 1200 mg/*** CK treatments were conducted with1000 mg/L ammonium under the same conditions,except without inoculum in the cathode *** consumption rate of ammonium in the cathodic chambers of CK,LA-MFC,MA-MFC,and HA-MFC were 9%,64%,84%,and 84%,*** degradation rate for COD achieved in the anode chambers of CK,LA-MFC,MA-MFC,and HA-MFC were 70%,86%,93%,and 93%,*** analysis of the microbial community of three treated MFCs in the cathode chamber indicated that the nitrification-denitrification process occurs in the cathode *** dominant species for nitrification was Nitrospira,and the dominant species for denitrification were Denitratisoma,Dechloromonas,and Candidatus_***,anammox process also observed in the cathode *** functional genes nir S/K,hzs B,and 16S rDNA were assessed by qPCR analysis,and the results confirmed the presence of denitrification-coupled anammox in the cathodic chamber.

关键词： Paddy soil Bioelectrochemical system Denitrification Anammox Microbial community

Criteria of limiting temperature and parametric analysis of the large deflection behavior for fully restrained steel beams in fire

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Science China(Technological Sciences) 2012年第1期55卷 264-275页

作者： XI Feng luan YanPing Shandong Provincial Key Laboratory of Structural Engineering School of Civil Engineering Shandong Jianzhu University Jinan 250101 China School of Civil Engineering Shandong Jianzhu University Jinan 250101 China

This paper mainly involve 3 parts:1) To apply the minimum principle of acceleration in dynamics of elastic-plastic continua at finite deformation to the statics problems,a computing model is presented for the restrained steel beams exposed to the *** this model,both effects of large deflection and thermal expansion deformation are taken into account,and the constitutive equations with the temperature effects are *** a dynamic finite difference(DFD) method is presented by using the dis-crete technique,which can be used in simulating the response of the steel beams at elevated temperature,and the large deflec-tion behavior and catenary action effects of the beams can be adequately *** primary numerical results show that the method is valid and *** with other methods,this technique is very simple,and it can also be further devel-oped to simulate the behavior of steel beams subjected to the coupling loading of explosion and fire when both effects of strain rate and inertia are considered.2) By using this DFD method,detailed parametric analysis are presented so as to check the consistency of response results for several different formulas of thermal expansion deformation and retention factors of steel at elevated temperature,the influence of these parameters on the critical temperature is examined.3) Based on the analysis for the curves of temperature-generalized yield function comprised by the axial force and bending moment,both criteria to determine the limiting temperature(or failure temperature) of large deflection steel beams are presented more explicitly,that is,both lim-iting temperatures can be determined by if the catenary force begins to appear or arrives at the maximum value,*** is shown by numerical results that both limiting temperatures are close to the both critical temperatures which are correspond-ing to the maximum deflections equal to span/20 and span/10,*** conclusion may be helpful to make r

关键词： steel beam fire DFD method large deflection parametric analysis limiting temperature criteria yield function

The Cyclophilin AtCYP71 Interacts with CAF-1 and LHP1 and Functions in Multiple Chromatin Remodeling Processes

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Molecular Plant 2011年第4期4卷 748-758页

作者： Hong Li Sheng luan Department of Plant and Microbial Biology University of California Berkeley CA 94720 USA

Chromatin is the primary carrier of epigenetic information in higher eukaryotes. AtCYP71 contains both cyclophilin domain and WD40 repeats. Loss of AtCYP71 function causes drastic pleiotropic phenotypic defects. Here, we show that AtCYP71 physically interacts with FAS1 and LHP1, respectively, to modulate their distribution on chromatin. The Ihpl cyp71 double mutant showed more severe phenotypes than the single mutants, suggesting that AtCYP71 and LHP1 synergistically control plant development. Such synergism was in part illustrated by the observation that LHP1 association with its specific target loci requires AtCYP71 function. We also demonstrate that AtCYP71 physically interacts with FAS1 and is indispensable for FAS1 targeting to the KNAT1 locus. Together, our data suggest that AtCYP71 is involved in fundamental processes of chromatin assembly and histone modification in plants.

关键词： Arabidopsis cyclophilin like heterochromatin protein 1 histone mark chromatin assembly factor Chromatin Immunoprecipitation.

Differences in mating behavior lead to asymmetric mating interactions and consequential changes in sex ratio between an invasive and an indigenous whitefly

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Integrative Zoology 2012年第1期7卷 1-15页

作者： Junbo luan Shusheng LIU Ministry of Agriculture Key Laboratory of Agricultural Entomology Institute of Insect SciencesZhejiang UniversityHangzhouChina

The invasive B whitefly and the indigenous ZHJ2 whitefly in China of the Bemisia tabaci complex represent two previously allopatric cryptic *** experiments have shown that the invasive B can displace the indigenous ***,we observed the mating behavior and mating interactions between B and ZHJ2 to elucidate the behavioral mechanisms underlying their *** 2 species are able to mate with each oth-er,although at a significantly lower frequency than that between males and females within the same ***-mated females produce only male progeny,indicating reproductive *** mating had only a marginal effect on reproduction of females in either *** observations on mating interactions between the 2 species showed that B had higher sexual activity than ZHJ2.B males were more like-ly to interrupt courtships initiated by rival males than ZHJ2 *** with ZHJ2 males,B males were also more likely to successfully interrupt courtships initiated by rival heterospecific males than by males of the same *** addition,B males guarded B females post-copulation,whereas ZHJ2 males did *** the 2 species co-occurred,the behavioral differences and interactions between them resulted in an increased propor-tion of females produced in the offspring of B but reduced proportion of females in the progeny of *** asymmetric mating interactions might be an important mechanism underlying the displacement of ZHJ2 by *** study shows that reproductive interference might contribute to the competitive exclusion between closely related species during biological invasions.

关键词： Bemisia tabaci biological invasion courtship displacement mating interactions

Development of a New Welding Material for Arc Welding of As-cast Ferritic Ductile Iron

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Journal of Materials Science & Technology 1998年第2期14卷 109-114页

作者： Sun, Daqian Zhou, Zhenfeng luan, Jingfei Jilin Univ Technol Changchun 130025 Peoples R China

By using the nickel welding wire, the effect of alloying elements on the chilling tendency of partial fusions zone (PFZ) of arc-welded ferritic ductile iron and the mechanical properties of weld metal have been systematically studied. On this basis, a new nickel electrode for arc welding of ferritic ductile iron (QT400-17) was developed for the first time. The mechanical properties of its weld metal can match those of ferritic ductile iron. The width of carbide layer (WCL) in PFZ is significantly decreased, the welded joint has excellent machinability and the weld metal has high hot cracking resistance. (Edited author abstract) 3 Refs.

关键词： Iron alloys

A Dynamic Road Incident Information Delivery Strategy to Reduce Urban Traffic Congestion

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IEEE/CAA Journal of Automatica Sinica 2018年第5期5卷 934-945页

作者： Liang Qi Mengchu Zhou Wenjing luan IEEE Department of Computer Scicnce and Technology Shandong University of Science and TechnologyQingdao 266590China Department of Computer Science Tongji UniversityShanghai 201804China Department of Electrical and Computer Engineering New Jersey Institute of TechnologyNewark NJ 07102USA Key Laboratory of Embedded System and Service Computing Ministry of EducationShanghai Electronic Transactions and Information Service Collaborative Innovation CenterDepartment of Com-puter ScienceTongji UniversityShanghai 201804China

Advanced information and communication technolo-gies can be used to facilitate traffic incident *** an incident is detected and blocks a road link,in order to reduce the incident-induced traffic congestion,a dynamic strategy to deliver incident information to selected drivers and help them make detours in urban areas is proposed by this ***-dependent shortest path algorithms are used to generate a subnetwork where vehicles should receive such information.A simulation approach based on an extended cell transmission model is used to describe traffic flow in urban networks where path information and traffic flow at downstream road links are well *** results reveal the influences of some major parameters of an incident-induced congestion dissipation process such as the ratio of route-changing vehicles to the total vehicles,operation time interval of the proposed strategy,traffic density in the traffic network,and the scope of the area where traffic incident information is *** results can be used to improve the state of the art in preventing urban road traffic congestion caused by incidents.

关键词： Cell transmission model(CTM) intelligent transportation systems(ITS) traffic incident management(TIM) urban traffic congestion

Numerical Simulation and Analysis of Power Consumption and Metzner-Otto Constant for Impeller of 6PBT

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Chinese Journal of Mechanical Engineering 2014年第3期27卷 635-640页

作者： luan Deyu CHEN Qiao ZHOU Shenjie School of Mechanical and Electrical Engineering Qingdao University of Science and Technology School of Mechanical Engineering Shandong University

Majority of non-Newtonian fluids are pseudoplastic with shear-thinning property, which means that the viscosity will be different in different parts of the stirred tank. In such mixing process, it is difficult to predict accurately the power consumption and mean shear rate for designing novel impeller. Metzner-Otto method is a widely accepted method to solve these questions in mixing non-Newtonian fluids. As a result, Metzner-Otto constant will become a key factor to achieve an optimum way of economical mixing. In this paper, taking glycerine and xanthan gum solutions as research system, the power consumption, stirred by the impeller composed of perturbed six-bent-bladed turbine （6PBT） with differently geometrical characteristics in a cylindrical vessel, is studied by means of computational fluid dynamics （CFD）. The flow is modeled as laminar and a multiple reference frame （MRF） approach is used to solve the discretized equations of motion. In order to determine the capability of CFD to forecast the flow process, the torque test experiment is used to measure the glycerine solution power consumption. The theological properties of the xanthan gum solutions are determined by a Brookfleld rheometer. It is observed that the power consumption predicted by numerical simulation agrees well with those measured using torque experiment method in stirring glycerine solution, which validate the numerical model. Metzner-Otto constant is almost not correlated with the flow behavior index of pseudoplastic fluids. This paper establishes the complete correlations of power constant and Metzner-Otto constant with impeller geometrical characteristics through linear regression analysis, which provides the valuable instructions and references for accurately predicting the power consumption and mean shear rate of pseudoplastic fluids in laminar flow, comparatively.

关键词： impeller composed of perturbed six-bent-bladed trbine pseudoplastic fluids power constant Metzner-Otto constant

Preparation of ZrC-SiC composite coatings by chemical vapor deposition and study of co-deposition mechanism

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Journal of Materials Science & Technology 2019年第12期35卷 2942-2949页

作者： Qiaomu Liu Jia Liu Xingang luan AECC Sichuan Gas Turbine Establishment Chengdu 610500China College of Materials Science and Engineering Xi'an University of Science and TechnologyXi'an710054China Science and Technology on Thermostructural Composite Materials Laboratory Northwestern Polytechnical UniversityXi'an 710072China

In this work, the Zr C-SiC composite coatings were co-deposited by chemical vapor deposition(CVD)using ZrCl4, MTS, CH4 and H2 as raw materials. The morphologies, compositions and phases of the composite coatings were characterized by scanning electron microscopy(SEM), energy dispersive X-ray spectroscopy(EDS) and X-ray diffraction(XRD). The results indicated that the morphologies, compositions and phases of the composite coatings were related to the deposition temperature, the flow rate of the carrier H2 gas, and the ratio of C/Zr. Moreover, the co-deposition mechanism of the composite coatings was also studied. It was found that different deposition temperatures resulted in different deposition mechanisms. At temperatures in the range of 1150–1250℃, the Zr C-SiC co-deposition was controlled by the surface kinetic process. At temperatures in the range of 1250–1400℃, the Zr C-SiC co-deposition was controlled by the mass transport process.

关键词： Chemical vapor deposition(CVD) Zirconium carbide Silicon carbide Composite coatings Co-deposition mechanism

Seismic rock physical modelling for gas hydrate-bearing sediments

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Science China Earth Sciences 2018年第9期61卷 1261-1278页

作者： Xinxin LIU Xingyao YIN Xiwu luan Key Laboratory of Gas Hydrate Ministry of Land and Resources Qingdao Institute of Marine Geology Laboratory for Marine Mineral Resources Qingdao National Laboratory for Marine Science and Technology School of Geosciences China University of Petroleum (East China)

There are ambiguities and uncertainties in the recognition of gas hydrate seismic reflections and in quantitative predictions of physical information of natural gas hydrate reservoirs from seismic data. Rock physical modelling is a bridge that transforms the seismic information of geophysical observations into physical information, but traditional rock physics models lack descriptions of reservoir micro-structures and pore-filling materials. Considering the mineral compositions and pore microstructures of gas hydrates, we built rock physical models for load-bearing and pore-filling gas hydrate-bearing sediments,describe the mineral compositions, pore connectivity and pore shape using effective media theory, calculated the shear properties of pore-filling gas hydrates using Patchy saturation theory and Generalized Gassmann theory, and then revealed the quantitative relation between the elastic parameters and physical parameters for gas hydrate-bearing sediments. The numerical modelling results have shown that the ratios of P-wave and S-wave velocities decrease with hydrate saturation, the P-wave and S-wave velocities of load-bearing gas hydrate-bearing sediments are more sensitive to hydrate saturation, sensitivity is higher with narrower pores, and the ratios of the P-wave and S-wave velocities of pore-filling gas hydrate-bearing sediments are more sensitive to shear properties of hydrates at higher hydrate saturations. Theoretical analysis and practical application results showed that the rock physical models in this paper can be used to calculate the quantitative relation between macro elastic properties and micro physical properties of gas hydrate-bearing sediments, offer shear velocity information lacking in well logging, determine elastic parameters that have more effective indicating abilities, obtain physical parameters such as hydrate saturation and pore aspect ratios, and provide a theoretical basis and practical guidance for gas hydrate quantitative predic

关键词： Gas hydrate Rock physical modelling Load-bearing gas hydrate Pore-filling gas hydrate Shear modulus Pore micro-structure Elastic parameter