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Promotion effects of salt-alkali on ammonia volatilization in a coastal soil

Pedosphere 2024年第1期34卷 191-199页

作者： Zhenqi SHI Dongli SHE Yongchun pan Yongqiu xia College of Agricultural Science and Engineering Hohai UniversityNanjing 210098China Jiangsu Province Engineering Research Center for Agricultural Soil-Water Efficient Utilization Carbon Sequestration and Emission ReductionNanjing 210098China Key Laboratory of Soil and Sustainable Agriculture Institute of Soil ScienceChinese Academy of SciencesNanjing 210008China

Coastal ecosystems are highly susceptible to salt-related problems due to their formation process and geographical location. As such ecosystems are the most accessible land resources on Earth, clarifying and quantifying the effects of salt-alkali conditions on N concentration and ammonia(NH_(3)) volatilization are pivotal for promoting coastal agricultural productivity. The challenge in establishing this effect is to determine how salt-alkali conditions impact NH_(3) volatilization through direct or indirect interactions. An incubation experiment using a coastal soil from a paddy farmland, combined with the structural equation modeling(SEM) method, was conducted to reveal the net effects of salt-alkali on NH_(3) volatilization and the role of environmental and microbial factors in mutual interaction networks. The specific experimental design consisted of four salt treatments(S1, S2, S3, and S4: 1‰, 3‰, 8‰, and 15‰ NaCl by mass of soil, respectively), four alkaline treatments(A1, A2, A3, and A4: 0.5‰, 1‰, 3‰, and 8‰ NaHCO_(3)by mass of soil, respectively) and a control without NaCl or NaHCO_(3) addition(CK), and each treatment had three urea concentrations(N1, N2, and N3: 0.05, 0.10, and 0.15 g N kg^(-1) soil,respectively) and three replicates. At the N1, N2, and N3 levels, NH_(3)volatilization increased by 9.31%–34.98%, 3.07%–26.92%, and 2.99%–43.61% as the NaCl concentration increased from 1‰ to 15‰, respectively, compared with CK. With an increase in the NaHCO_(3)concentration from 0.5‰ to 8‰, NH_(3) volatilization increased by 8.36%–56.46%, 5.49%–30.10%, and 30.72%–73.18% at the N1, N2, and N3 levels, respectively, compared with CK. According to the SEM method, salinity and alkalinity had positive direct effects on NH_(3)volatilization, with standardized path coefficients of 0.40 and 0.19, *** the total effects(net positive and negative effects) in the SEM results, alkalinity had a greater influence than salinity(total standardized coefficien

关键词： alkalinity coastal ecosystem NH_(3)emission N-transforming microbe salinity structural equation modeling

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Resonant Activation Induced by Four-Value Noise

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Communications in Theoretical Physics 2008年第2期49卷 385-390页

作者： HAN Yin-xia LI Jing-hui P.O. Box 58 Faculty of Science Ningbo University Ningbo 315211 China

The phenomenon of the resonant activation （RA） of a particle over a fluctuating potential barrier with a four-value noise is investigated. It is shown that the mean first passage time （MFPT） displays six minima as the function of the transition rates γ1, γ2, γ3, γ4, γ5, and 76 of the four-value noise, respectively. In addition, the effect of other parameters of the system, such as the noise strength D of the additive Gaussian white noise and the parameter value a, b, c, and d of the four-value noise, on the RAs is also investigated.

关键词： resonant activation four-value noise mean first passage time

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The Spectral Gap for Quasi-birth and Death Processes

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Acta Mathematica Sinica,English Series 2012年第5期28卷 1075-1090页

作者： Yong Hua MAO Liang hui xia School of Mathematical Sciences LMCSMinistry of EducationBeijing Normal University Department of Mathematics Ji'nan University

For a reversible quasi-birth and death process, we generalize and refine the decomposition method, by constructing a birth-death process and a sequence of restriction processes. The spectral gap for the quasi-birth and death process is estimated in terms of the spectral gaps for these processes, and in some special cases, the estimation is sharp. With the aid of the symmetrization procedure, the result is also applied to two queueing models： M/M/1 in random environment and MIMIc with synchronous vacation.

关键词： Quasi-birth and death process spectral gap birth-death process M/M/1 in random environment MIMIc with synchronous vacation

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Two Operators Related to Marcinkiewicz Integrals

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Acta Mathematica Sinica,English Series 2009年第10期25卷 1617-1634页

作者： hui xia MO Shan Zhen LU School of Science Beijing University of Post and Telecommunications Beijing 100876 China School of Mathematical Sciences Normal University Beijing 100875 China

In this paper, the authors consider the boundedness of generalized higher commutator of Marcinkiewicz integral μΩ^b, multilinear Marcinkiewicz integral μΩ^A and its variation μΩ^A on Herz-type Hardy spaces, here Ω is homogeneous of degree zero and satisfies a class of L^s-Dini condition. And as a special case, they also get the boundedness of commutators of Marcinkiewicz integrals on Herz-type Hardy spaces.

关键词： generalized higher commutator of Marcinkiewicz integral multilinear Marcinkiewicz integral Herz-type Hardy space Lipschitz space

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Existence of Solutions for the Critical Elliptic System with Inverse Square Potentials

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Acta Mathematicae Applicatae Sinica 2013年第2期29卷 315-328页

作者： Zhao-xia LIU Zhao-hui LIU Department of Information and Computational Science School of Sciences Minzu University of China Suncun Middle School Gaoxin District of Jinan

Let Ω∈← 0 be an open bounded domain in RN （N 〉 3） and 2＊（s） = 2（N-8） =2（N-s）N-22. We consider the following elliptic system of two equations in where A, μ 〉 0 and α, β 〉 1 satisfy α ＋ β = 2＊（s... 详细信息

Let Ω∈← 0 be an open bounded domain in RN （N 〉 3） and 2＊（s） = 2（N-8） =2（N-s）N-22. We consider the following elliptic system of two equations in where A, μ 〉 0 and α, β 〉 1 satisfy α ＋ β = 2＊（s）. Using the Moser iteration, we prove the asymptotic behavior of solutions at the origin. In addition, by exploiting the Mountain-Pass theorem, we establish the existence of solutions.

关键词： elliptic system variational functional Palais-Smale condition critical point

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Theoretical studies of structures and spectroscopic properties of [(tpy)(bpy)RuC≡CC_6H_4R]^+(tpy = 2,2′:6′,2″-terpyridine, bpy = 2,2′-bipyridine; R = F, Cl, H, Me and OMe)

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Science China(Technological Sciences) 2014年第4期57卷 725-733页

作者： xia XiQuan ZHANG hui ZHANG GuiLing Key Laboratory of Green Chemical Engineering and Technology of College of Heilongjiang Province College of Chemical and Environmental Engineering Harbin University of Science and Technology

A series of polypyridine ruthenium （II） acetylide complexes, [（tpy）（bpy）RuC≡CC6H4R]^＋（tpy = 2,2＇：6＇,2＂-terpyridine, bpy = 2,2＇-bipyridine; R = F （1）, C1 （2）, H （3）, Me （4） and OMe （5）） are investigated theoretically to explore their electronic structures and spectroscopic properties. Their ground/excited state geometries, electronic structures and spectroscopic properties are first calculated using density functional theory （DFT） and time-dependent DFT （TDDFT）. The absorption and emission spectra of the complexes in acetonitrile solution are also obtained by using TDDFT （B3LYP） method associated with the CPCM model. The calculations show that the energy levels of HOMOs for 1-5 are sensitive to the substituent on phenylacetylide ligand and increase with the same order of the electron-donating ability of the substituents; however, those of polypyridine-based LUMOs vary slightly. The lowest-energy absorptions and emissions for 1-5 are progressively red-shifted in the order of 1 ~ 2 〈 3 〈 4 〈 5 when the electron-donating groups are introduced into the phenylacetylide [igand. The phosphorescence of 1 are attributed to {[dxz（Ru）＋π（C≡C）]→[π^＊（tpy）]} （3MLCT/3LLCT） transition, whereas those of 2-5 are originated from { [dxz/dxy（Ru）＋ π（C ≡C）＋g（C6H4R）] → [＊（tpy/bpy）] } （3MLCT/3LLCT） transitions.

关键词： polypyridine ruthenium (II) acetylide complexes absorption spectra emission spectra DFT TDDFT

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Generalized Commutators for Marcinkiewicz Type Integrals with Variable Kernels

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Acta Mathematicae Applicatae Sinica 2011年第3期27卷 471-480页

作者： hui-xia Mo Shan-zhen Lu School of Science Beijing University of Post and Telecommunications Beijing 100876 China School of Mathematical Sciences Beijing Normal University Beijing 100875 China

Let A be a function with derivatives of order m and D γ A ∈■β （0 〈 β 〈 1, ｜γ｜ = m）. The authors in the paper prove that if Ω（x, z） ∈ L ∞ （R n ） × L s （S n 1 ）（s ≥ n/（n β）） is homogenous of... 详细信息

Let A be a function with derivatives of order m and D γ A ∈■β （0 〈 β 〈 1, ｜γ｜ = m）. The authors in the paper prove that if Ω（x, z） ∈ L ∞ （R n ） × L s （S n 1 ）（s ≥ n/（n β）） is homogenous of degree zero and satisfies the mean value zero condition about the variable z, then both the generalized commutator for Marcinkiewicz type integral μ A Ω and its variation μ A Ω are bounded from L p （R n ） to L q （R n ）, where 1 〈 p 〈 n/β and 1/q = 1/p β/n. The authors also consider the boundedness of μ A Ω and its variation μ A Ω on Hardy spaces.

关键词： Marcinkiewicz integral variable kernel Lipschitz space Hardy space

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Commutators Generated by Multilinear Calderon-Zygmund Type Singular Integral and Lipschitz Functions

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Acta Mathematicae Applicatae Sinica 2014年第4期30卷 903-912页

作者： hui-xia MO Shan-zhen LU School of Science Beijing University of Posts and Telecommunications School of Mathematical Sciences Beijing Normal University

In this paper, we establish the boundedness of commutators generated by the multilinear Calderon- Zygmud type singular integrals and Lipschitz functions on the Triebel-Lizorkin space and Lipschitz spaces.

关键词： multilinear Calderon-Zygmud type singular integral commutator Triebel-Lizorkin space Lips-chitz space

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Spectral Gap for Open Jackson Networks

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Acta Mathematica Sinica,English Series 2015年第12期31卷 1879-1894页

作者： Yong Hua MAO Liang hui xia School of Mathematical Sciences LMCSMinistry of Education Beijing Normal University Department of Mathematics Ji'nan University

We generalize the decomposition method of the finite Markov chains for Poincare inequality in Jerrum et al.（***.,14,1741-1765（2004）） to the reversible continuous-time Markov *** inductively,we give the lower bound of spectral gap for the ergodic open Jackson network by the decomposition method and the symmetrization *** upper bound of the spectral gap is also presented.

关键词： Jackson networks reversibility decomposition of Markov chain spectral gap symmetrization

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An acetic acid refluxing-electrochemistry combined strategy to activate supported-platinum electrocatalysts

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Particuology 2017年第1期15卷 111-117页

作者： Yan Feng Jinding pan hui Liu Jun Yang State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 China University of ChineseAcademy of Sciences No. 19A Yuquan Road Beijing 100049 China Center for Mesoscience Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 China

Surfactant removal from the surface of platinum-based nanoparticles prepared using solution-based methods is a prerequisite to realize their high catalytic performance for electrochemical reactions. Herein, we report an effective approach combining acetic acid refluxing with an electrochemical process for the removal of amine- or thiol-based capping agents from the surface of supported-platinum nanoparticles. This strategy involves surfactant protonation by refluxing the supported-platinum particles in acetic acid followed by surfactant removal by subsequent electrochemical treatment at high potential. We demon- strate that this combined activation process is essential to enhance platinum particle performance in catalyzing direct methanol fuel cell reactions, including methanol oxidation and oxygen reduction reac- tions. The studies in this work show promise in electrocatalysis applications of solution-based materials synthesis.

关键词： Platinum Nanoparticle Methanol oxidation reaction Oxygen reduction reaction Electrocatalysis

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