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An improved creep model for unsaturated reticulated red clay

Journal of rock Mechanics and Geotechnical Engineer.ng 2024年第11期16卷 4754-4768页

作者： Chuang Zhang junhui Zhang Jianzhong Li Key Laboratory of Special Envir.nment road Engineer.ng of Hunan Province Changsha University of Science and TechnologyChangsha410114China School of Traffic and Tr.nsportation Engineer.ng Changsha University of Science and TechnologyChangsha410114China Department of Architecture and Civil Engineer.ng City University of Hong KongChina School of Geosciences and Info-Physics Central South UniversityChangsha410083China

Establishment of a creep model is an important method to analyze the relationship between soil creep deformation and time,and the element model is widely used for studying soil ***,the element creep model is employed for fitting saturated soil,and the mechanical element model is generally linear,which cannot well fit the nonlinear deformation of the soil with time in *** creep process of the soil is not only time-dependent,but also related to the deviatoric stress ***,the fractional calculus theory and a parameter.n reflecting the effect of deviatoric stress level on the creep properties of the soil were introduced into the element model,and the fractional qBurgers creep model was established by using the fractional Koeller dashpot and Caputo fractional *** proposed model was used to fit the triaxial test data of reticulated red clay under differ.nt net confining pressures and matric suctions by unsaturated triaxial *** proposed model can well describe the nonlinearity of unsaturated reticulated red clay,has memory and global correlation to the creep development process of unsaturated reticulated red clay,and has clear physical *** functional relationships of the model parameters with the matric suction,net confining pressure and deviatoric stress level were deduced,so that the creep curves of unsaturated reticulated red clay can be obtained for any conditions,which is of great value for the study of unsaturated soils.

关键词： Fractional calculus Creep model Burgers Parameter study Unsaturated reticulated red clay

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Pr.nciple and Experimental Verification of novel Dual Driving Face rotary Ultrasonic Motor

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Chinese Journal of Mechanical Engineer.ng 2013年第5期26卷 1006-1012页

作者： LU Xiaolong HU junhui YAnG Lin ZHAO Chunsheng State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and Astronautics

Existing rotary ultrasonic motors operating in extreme envir.nments cannot meet the requirements of good envir.nmental adaptability and compact structure at same time,and existing ultrasonic motors with Langevin tr.nsducers show better envir.nmental adaptability,but size of these motors are usually big due to the radial arr.ngement of the Langevin tr.nsducers.A novel dual driving face rotary ultrasonic motor is proposed,and its working pr.nciple is experimentally *** working pr.nciple of the novel ultrasonic motor is firstly *** 5th in-plane flexural vibration travelling wave,excited by the Langevin tr.nsducers around the stator r.ng,is used to drive the *** the finite element method is used in the determination of dimensions of the prototype motor,and the confirmation of its working *** that,a laser Doppler vibrometer system is used for measur.ng the resonance frequency and vibration amplitude of the *** last,output characteristics of the prototype motor are measured,envir.nmental adaptability is tested and performance for driving a metal ball is also *** room temperature and 200 V(zero to peak) driving voltage,the motor’s no-load speed is 80 r/min,the stalling torque is 0.35 n·m and the maximum output power is 0.85 *** response time of this motor is 0.96 ms at the room temperature,and it decreases or increases little in cold envir.nment.A metal ball driven by the motor can rotate at 210 r/min with the driving voltage 300 V(zero to peak).results indicate that the prototype motor has a large output torque and good envir.nmental adaptability.A rotary ultrasonic motor owning compact structure and good envir.nmental adaptability is proposed,and lays the foundations of ultrasonic motors’ applications in extreme envir.nments.

关键词： ultrasonic motor piezoelectric tr.nsducer dual driving face in-plane flexural vibration mode

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Designer TAL Effectors Induce Disease Susceptibility and resistance to Xanthomonas oryzae pv. Oryzae in rice

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Molecular Plant 2013年第3期6卷 781-789页

作者： Ting Li Sheng Huang junhui Zhou Bing Yang Department of Genetics Development and Cell Biology Iowa State University Ames IA 50011 USA Present address: State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources College of Life Science and Technology Guangxi University Nanning Guangxi 530005 China

TAL （tr.nscription activator-like） effectors from Xanthomonas bacteria activate the cognate host genes, leading to disease susceptibility or resistance dependent on the genetic context of host target genes. The modular.nature and DnA recognition code of TAL effectors enable custom-engineer.ng of designer TAL effectors （dTALE） for gene activation. However, the feasibility of dTALEs as tr.nscription activators for gene functional analysis has not been demonstrated. Here, we report the use of dTALEs, as expressed and delivered by the pathogenic Xanthomonas oryzae pv. oryzae （Xoo）, in revealing the new function of two previously identified disease-related genes and the potential of one developmental gene for disease susceptibility in rice/Xoo interactions. The dTALE gene dTALE-xa27, designed to target the susceptible allele of the resistance gene Xa27, elicited a resistant reaction in the otherwise susceptible rice cultivar Ir24. Four dTALE genes were made to induce the four annotated Xa27 homologous genes in rice cultivar.nipponbare, but none of the four induced Xa27-1ike genes conferred resistance to the dTALE-containing Xoo strains. A dTALE gene was also generated to activate the recessive resistance gene xa13, an allele of the disease-susceptibility gene Os8n3 （also named Xa13 or OsSWEETll, a member of sucrose efflux tr.nsporter SWEET gene family）. The induction of xa13 by the dTALE r.ndered the resistant rice IrBB13 （xa13/xa13） susceptible to Xoo. Finally, OsSWEET12, an as-yet uncharacterized SWEET gene with no corresponding naturally occurr.ng TAL effector identified, conferred susceptibility to the Xoo strains expressing the corresponding dTALE genes. Our results demonstrate that dTALEs can be delivered through the bacterial secretion system to activate genes of interest for functional analysis in plants.

关键词： TA/effector rice Xanthomonas Xa27 disease susceptibility disease resistance designer TAL effector.

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Preparation of birnessite-supported Pt nanoparticles and their application in catalytic oxidation of formaldehyde

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Journal of Envir.nmental Sciences 2012年第6期24卷 1117-1124页

作者： Linlin Liu Hua Tian junhui He Donghui Wang Qiaowen Yang Functional nanomaterials Laboratory and Key Laboratory of Photochemical Conversion and Optoelectr.nic Materials Technical Institute of Physics and Chemistry(TIPC)Chinese Academy of SciencesBeijing 100190China School of Chemical&Envir.nmental Engineer.ng China University of Mining&TechnologyBeijing 100083China research Institute of Chemical Defense Beijing 100083China

Flaky and nanospherical birnessite and birnessite-supported Pt catalysts were successfully prepared and characterized by means of Xray diffraction （XrD）,tr.nsmission electr.n microscopy （TEM）,energy dispersive spectroscopy （EDS） and n2 *** of the birnessite morphology and Pt reduction method on the catalytic activity for the complete oxidation of formaldehyde （HCHO） were *** was found that flaky birnessite exhibited higher catalytic activity than nanospherical *** promoting effect of Pt on the birnessite catalyst indicated that the reduction method of the Pt precursor greatly influenced the catalytic *** birnessite-supported Pt nanoparticles reduced by KBH 4 showed the highest catalytic activity and could completely oxidize HCHO into CO2 and H2O at 50℃,whereas the sample reduced using H2-plasma showed lower activity for HCHO *** differ.nces in catalytic activity of these materials were jointly attributed to the effects of pore structure,surface active sites exposed to HCHO and the dispersion of Pt nanoparticles.

关键词： birnessite manganese oxide noble metals formaldehyde oxidation

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Polymer Electr.n Acceptors Based on Fluor.nated Isoindigo Unit for Polymer Solar Cells

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Chinese Journal of Chemistry 2018年第5期36卷 411-416页

作者： junhui Miao Hall Xu Bin Meng Jun Liu Lixiang Wang State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences Chang- chun Jijin 130022 China University of Science and Technology of China Hefei Anhui 230026 China Center for Advanced Optoelectr.nic Functional Materials research Northeast Normal University Changchun Jilin 130024 China

Most of efficient polymer electr.n acceptors for polymer solar cells （PSCs） are based on naphthalene diimide or perylene diimide as the electr.n deficient building block. In this paper, for the first time, we report polymer electr.n acceptors based on fluor.nated isoindigo IF-lID） as the electr.n deficient building block. We synthesized two polymer electr.n acceptors consisting of alternating F-lID unit and thiophene/selenophen unit, They show low-lying LUMo/HOMO energy levels of-3.69/-5.69 eV, high electr.n mobilities of 1.31 ×10-5 cm2.V-1s-1 and broad absorption spectra with the optical bandgap of 1.61 eV. PSC devices using the two F-liD-based polymers as polymer electr.n acceptors show encouraging power conversion efficiencies （PCEs） of up to 1.50% with an open-circuit voltage （Voc） of 0.97V, a short-circuit curr.nt density （Jsc） of 2.91 ***2, and a fill factor （FF） of 53.2%. This work suggests a new kind of polymer electr.n acceptors based on F-IID unit.

关键词： polymer solar cells polymer electr.n acceptor fluor.nated isoindigo n-type conjugated polymer

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Interactive response of photosynthetic characteristics in Haloxylon ammodendr.n and Hedysarum scoparium exposed to soil water and air vapor pressure deficits

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Journal of Envir.nmental Sciences 2015年第8期27卷 184-196页

作者： Chunmei Gong Jiajia Wang Congxia Hu junhui Wang Pengbo ning Juan Bai College of Life Sciences Northwest A&F University College of Veter.nary Medicine Northwest A&F University

C4 plants possess better drought toler.nce than C3 plants. However, Hedysarum scoparium, a C3 species, is dominant and widely distributed in the desert areas of northwestern China due to its str.ng drought toler.nce. This study compared it with Haloxylon ammodendr.n, a C4 species, regarding the interactive effects of drought stress and differ.nt leaf–air vapor pressure deficits. Variables of interest included gas exchange, the activity levels of key C4 photosynthetic enzymes, and cellular anatomy. In both species, gas exchange parameters were more sensitive to high vapor pressure deficit than to str.ng water stress, and the net CO2 assimilation rate（A n） was enhanced as vapor pressure deficits increased. A close relationship between A n and stomatal conductance（g s） suggested that the species shared a similar response mechanism. In H. ammodendr.n, the activity levels of key C4 enzymes were higher, including those of phosphoenolpyruvate carboxylase（PEPC） and nicotinamide adenine dinucleotide phosphate-malate enzyme（nADP-ME）, whereas in H. scoparium, the activity level of nicotinamide adenine dinucleotide-malate enzyme（nAD-ME） was ***, H. scoparium utilized adaptive structural features, including a larger relative vessel area and a shorter distance from vein to stomata, which facilitated the movement of water. These findings implied that some C4 biochemical pathways were present in H. scoparium to respond to envir.nmental challenges.

关键词： C4photosynthesis Gas exchange H.ammodendr.n H.scoparium Water stress Vapor pressure deficit

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EXISTEnCE OF MULTIPLE SOLUTIOnS FOr A FrACTIOnAL p-LAPLACIAn SYSTEM WITH COnCAVE-COnVEX TErM

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Acta Mathematica Scientia 2018年第6期38卷 1821-1832页

作者： junhui XIE Xiozhong HUAnG iping GHEn. Department of Mathematics Hubei University for Nationalities

Abstract In this article, we study the existence of multiple solutions for the following sys-tem driven by a nonlocal integro-differ.ntial operator with zero Dirichlet boundary conditions {（-△）p^su=a（x）｜u｜^q-2u＋2α/α＋βc（x）｜u｜^α-2u｜u｜^β,in Ω,（-△）p^su=a（x）｜u｜^q-2u＋2α/α＋βc（x）｜u｜^α｜u｜^β-***Ω,（0.1）u=v=0,in r.n／Ωwhere Ω is a smooth bounded domain in r.n, n 〉 ps with s ∈ （0, 1） fixed, a（x）, b（x）, c（x）〉 0and a（x）,b（x）,c（x） ∈ L^∞（Ω）, 1 〈 q 〈 p and α,β 〉 1 satisfy p 〈 α＋β 〈 p^＊, p^＊ = np/n-ps·By nehari manifold and fiber.ng maps with proper conditions, we obtain the multiplicity ofsolutions to problem （0.1）.

关键词： fractional p-Laplacian system nehari manifold multiple solutions

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Long-time precipitation reduction and nitrogen deposition increase alter soil nitrogen dynamic by influencing soil bacterial communities and functional groups

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Pedosphere 2020年第3期30卷 363-377页

作者： Guoyong YAn Yajuan XInG Shijie HAn junhui ZHAnG Qinggui WAnG Changcheng MU School of Forestry Northeast Forestry UniversityHarbin 150040China College of Agricultural resource and Envir.nment Heilongjiang UniversityHarbin 150080China College of Life Sciences Henan UniversityKaifeng 475004China institute of Applied Ecology Chinese Academy of SciencesShenyang 110016China

The effects of precipitation reduction and nitrogen deposition increase on soil bacterial communities and functions impact soil nitrogen cycling. Seasonal changes could modify the effects of precipitation reduction and nitrogen deposition increase on bacterial communities and functions by changing soil envir.nments and properties. Understanding soil microbial communities and the seasonal response of functions to precipitation reduction and nitrogen deposition increase may be important for the accurate prediction of changes in the soil nitrogen dynamics. Thus, a long-term field simulation experiment of nitrogen deposition increase and throughfall exclusion was established to investigate soil bacterial communities’ response to nitrogen deposition increase and/or precipitation reduction, with no nitrogen deposition increase and no precipation reduction as a control, in a temperate forest. We examined soil bacterial communities(Illumina sequencing) under differ.nt treatments dur.ng the winter, freezing-thawing cycle periods(FTCs), and growing season. The bacterial functional groups were predicted by the FAPrOTAX database. The results showed that nitrogen deposition increase, precipitation reduction, the combined effect of nitrogen deposition increase and precipitation reduction, and seasonal changes significantly altered the soil bacterial community ***, by combining the result of a previous study in which nitrogen deposition increase increased the nitrous oxide flux in the same experimental system, the loss of soil nitrogen was increased by the decrease in denitrification and increase of nitrification bacteria under.nitrogen deposition increase,while ammonification bacteria significantly increased and n-fixing bacteria significantly decreased with precipitation reduction compared to the control. In relation to seasonal changes, the aromatic-degrading, cellulolytic, and ureolytic bacteria were lowest dur.ng FTCs, which indicated that FTCs might inh

关键词： copiotrophic bacteria denitrification multidimensional effect nitrification oligotrophic bacteria seasonal changes soil acidification water stress

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Effect of n and P addition on soil organic C potential mineralization in forest soils in South China

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Journal of Envir.nmental Sciences 2008年第9期20卷 1082-1089页

作者： OUYAnG, Xuejun ZHOU, Guoyi HUAnG, Zhongliang ZHOU, Cunyu LI, Jiong SHI, junhui ZHAnG, Deqiang South China Botanical Garden Chinese Academy of Sciences Guangzhou 510650 China College of Horticulture and Gardening Yangtze University Jingzhou 434025 China Xinjiang Academy of Forest Sciences Urumqi 830002 China

Atmospheric nitrogen deposition is at a high level in some forests of South China. The effects of addition of exogenous n and P on soil organic carbon mineralization were studied to address: (1) if the atmospheric n deposition promotes soil C storage through decreasing mineralization; (2) if the soil available P is a limitation to organic carbon mineralization. Soils (0–10 cm) was sampled from monsoon evergreen broad-leaved forest (MEBF), coniferous and broad-leaved mixed forest (CBMF), and Pinus massoniana...

关键词： addition inorganic n available P mineralization soil organic C South China

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The effect of soil moisture on the response by fungi and bacteria to nitrogen additions for.n_(2)O production

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Journal of Forestry research 2021年第5期32卷 2037-2045页

作者： Lei Zhang Junqiang Zheng Xu Han junhui Zhang Chengxu Li Shicong Geng Shijie Han Department of Boundary Layer Ecology Key Laboratory of Forest Ecology and Management of Chinese Academy of ScienceInstitute of Applied EcologyShenyang 110000People’s Republic of China Department of resource and Envir.nmental Science University of Chinese Academy of SciencesBeijing 100039People’s Republic of China Yellow river Floodplain Ecosystems research Station Department of Life SciencesHenan UniversityJinming AvenueKaifengHenan 475001People’s Republic of China Department of Municipal and Envir.nmental Engineer.ng Shenyang Jianzhu UniversityShenyang 110168People’s Republic of China

In addition to bacteria,the contribution of fungi to nitrous oxide(n_(2)O)production has been recognized but the responses of these two broad and unrelated groups of microorganisms to global envir.nmental changes,atmospheric nitrogen(n)deposition,and precipitation in terms of n_(2)O production are *** studied how these two microbial-mediated n_(2)O production pathways responded to soil moisture conditions and to n addition in an n-limited temperate *** from a long-term n addition experiment in Changbai Mountain,northeastern China were *** concentrations of cycloheximide and streptomycin,both inhibitors of fungal and bacterial activity,were used to determine the contributions of both to n_(2)O production in 66%,98%and 130%water-filled pore spaces(WFPS).The results showed that n_(2)O production decreased significantly with increasing cycloheximide concentration whereas streptomycin was only inhibiting n_(2)O emissions at 98%and 130%*** bacterial pathway of n_(2)O production in n-addition(nadd)soil was significantly more dominant than that in untreated(namb)*** differ.nce in the fungal pathway of n_(2)O production between the soil with nitrogen addition and the untreated soil was not *** n_(2)O emissions increased with increasing soil moisture,especially at 130%WFPS,a completely flooded *** dominated carbon dioxide(CO_(2))and n_(2)O emissions in nadd soil and at 130%WFPS regardless of n status,while fungi dominated CO_(2)and n_(2)O emissions in soil without n addition at 66%and 98%*** results suggest that flooded soil is an important source of n_(2)O emissions and that bacteria might be better adapted to compete in fertile soils under anoxic conditions.

关键词： nitrous oxide Fungi Bacteria nitrogen addition Soil moisture conditions

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