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Ultraviolet humic-like component contributes to riverine dissolved organic matter biodegradation

Journal of Environmental Sciences 2023年第2期124卷 165-175页

作者： Maofei ni Siyue Li College of Eco-Environmental Engineering Guizhou Minzu UniversityGuiyang 550025China Research Center for Environmental Ecology and Engineering School of Environmental Ecology and Biological EngineeringWuhan Institute of TechnologyWuhan 430205China The karst environmental geological hazard prevention laboratory of Guizhou Minzu University Guiyang 550025China Key Laboratory of Reservoir Aquatic Environment Research Center for EcohydrologyChongqing Institute of Green and Intelligent TechnologyChinese Academy of SciencesChongqing 400714China

Biological degradation of dissolved organic matter(DOM)regulates its structure and fate in river *** views suggested that labile components were dominantly consumed by microbial *** we provide new observations that a part of recalcitrant compounds largely contribute to riverine DOM *** excitationemission matrix fluorescent spectroscopy combined with peak picking and parallel factor analysis are used to explore component variability during DOM ***-like and tryptophan-like DOM are the primary components of riverine DOM,with proportion contributions of 39%–82% and 16%–61% for % of the maximumfluorescence intensity,*** 56 days of aerobic incubation in the dark,large amounts of tyrosine-like DOM generation are *** temperature enhances the decomposition of ultraviolet humiclike substance and further stimulates labile DOM bio-mineralization into carbon ***,averaged proportions of amino acid compositions(peak B and T)markedly increase(p<0.05)as the humic-like compositions(peak A,M and C)decrease after DOM incubation,suggesting incomplete degradation of refractory DOM from high-molecular to low-molecular weight *** findings support the new notion of the continuous DOM biodegradation in a mode as“steps by steps”,contributing to a new understanding of carbon cycling for the UN Sustainable Development Goal.

关键词： Dissolved organic matter(DOM) Sequential biodegradation Recalcitrant compounds Component and fate Fluorescence analysis

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Bioinformatics Analysis on lncRNA and mRNA Expression Profiles for Novel Biological Features of Valvular Heart Disease with Atrial Fibrillation

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Journal of Electronic Science and Technology 2021年第1期19卷 53-69页

作者： Wei Zeng ni-ni Rao Ke Liu the School of Life Science and Technology University of Electronic Science and Technology of ChinaChengdu 610054 the Guangdong Institute of Electronic Information Engineering University of Electronic Science and Technology of ChinaDongguan 523107 the Department of Sichuan Academy of Medical Science Sichuan Provincial People’s HospitalChengdu 610072

The biological features of the valvular heart disease with atrial fibrillation(AF-VHD)remain unknown when involving long non-coding RNAs(lncRNAs).This study performed system analysis on lncRNA and messenger RNA(mRNA)expression profiles constructed by using bioinformatics methods and tools for biological features of *** change and t-test were used to identify differentially expressed(DE)lncRNAs and *** enrichment analysis of DE mRNAs was *** subgroups formed by lncRNAs and nearby mRNAs were screened,and a transcriptional regulation network among lncRNAs,mRNAs,and transcription factors(TFs)was *** interactions between mRNAs related to lncRNAs and drugs were *** 620 AF-VHDrelated DE lncRNAs and 452 DE mRNAs were *** 3 lncRNA subgroups were *** 665 regulations mediated by lncRNAs and TFs were *** 9 mRNAs related to lncRNAs had 1 or more potential drug interactions,totaling 37 *** these,9 drugs targeting 3 genes are already known to be able to control or trigger atrial fibrillation(AF)or other cardiac *** found biological features of AF-VHD provide foundations for further biological experiments to better understand the roles of lncRNAs in development from the valvular heart disease(VHD)to AF-VHD.

关键词： Expression profiles long non-coding RNA(lncRNA) messenger RNA(mRNA) valvular heart disease(VHD) valvular heart disease with atrial fibrillation(AF-VHD).

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CALCULATION MODELS FOR THE SUSPENDED SEDIMENT TRANSPORT RATE

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Journal of Hydrodynamics 1993年第1期5卷 10-21页

作者： ni, Jinren Peking Univ Beijing China

The calculation accuracy of the suspended sediment transport rate relies on that of the vertical distribution of the particle concentration,the particle velocity distribution and the reference *** view of the limitations of the previons formulas for both the velocity and the concentration distributions,general expressions are introduced to the calculation of sus- pended sediment transport *** on these analyses,a simple and practical calculation model is given in the present paper.

关键词： suspended sediment transport rate concentration profile

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MIXING MODEL EXTENDED TO TURBULENT FLOW IN NARROW SMOOTH OPEN CHANNELS

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Journal of Hydrodynamics 1996年第4期8卷 40-48页

作者： ni, Jinren Peking Univ Beijing China

On the basis of systematic analyses of the relation among the width-depth ratios, the locations of maximum velocity in the cross section and boundary shear stress distributions, a simple model for the velocity distribution in smooth rectangular open channels has been presented. it became possible to reasonably predict the velocity value at every point of a rectangular cross section. As a good approximation, the model was then suggested to be used for turbulent flow in open channel with any given symmetrical shape.

关键词： Approximation theory Flow of water Mathematical models Turbulent flow Velocity Viscous flow

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基于刻蚀处理的池沸腾传热性能实验研究

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原子与分子物理学报 2025年第3期42卷 180-188页

作者：王菊萍匡纯纯刘妮上海理工大学制冷技术研究所上海200093

为探究刻蚀处理铜板表面对池沸腾传热性能的改善效果,搭建了可视化实验平台,制备不同刻蚀浓度和刻蚀时间处理的表面,采用去离子水为工质,进行饱和池沸腾实验.结果表明,氨水刻蚀浓度越大,表面的换热性能越强,氨水刻蚀时间越长,表面换热... 详细信息

为探究刻蚀处理铜板表面对池沸腾传热性能的改善效果,搭建了可视化实验平台,制备不同刻蚀浓度和刻蚀时间处理的表面,采用去离子水为工质,进行饱和池沸腾实验.结果表明,氨水刻蚀浓度越大,表面的换热性能越强,氨水刻蚀时间越长,表面换热性能越强.热流密度为43.2 W/cm^(2)时,0.05 mol/L氨水刻蚀4 h表面、0.05 mol/L氨水刻蚀5 h表面、0.05 mol/L氨水刻蚀8 h表面、0.03 mol/L氨水刻蚀4 h表面、0.05 mol/L氨水刻蚀4 h表面和0.10 mol/L氨水刻蚀4 h表面上的换热系数分别提高了46%、92%、105%、36%、45%、78%.此外,对其表面进行表征,结果说明了其优异的沸腾性能.刻蚀处理增强了表面粗糙度,有效面积,从而促进液体的补充,能够在较小的过热度下达到更高的临界热流密度.可视化研究结果表明,刻蚀表面具有更多的成核位点,更小的气泡离开直径和离开频率.这些结果显示出刻蚀表面强化池沸腾换热的潜力.

关键词：池沸腾刻蚀传热性能气泡动力学微纳结构表面

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Virtual Betti numbers and virtual symplecticity of 4-dimensional mapping tori,Ⅱ

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Science China Mathematics 2017年第9期60卷 1591-1598页

作者： ni Yi Department of Mathematics California Institute of TechnologyPasadenaCA 91125USA

We show that if the fiber of a closed 4-dimensional mapping torus X is reducible and not S2× S1 or RP3#P3, then the virtual first Betti number of X is infinite and X is not virtually symplectic. This confirms two con... 详细信息

关键词： virtual Betti number virtual symplecticity 4-dimensional mapping torus reducible 3-manifold

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The relationship between apparent equilibrium temperature and closure temperature with application to oxygen isotope geospeedometry

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Chinese Journal Of Geochemistry 2014年第2期33卷 125-130页

作者： ni Huaiwei CAS Key Laboratory of Crust-Mantle Materials and Environments School of Earth and Space Sciences University of Science and Technology of China Department of Earth and Environmental Sciences The University of Michigan

Oxygen isotope fractionation between coexisting minerals in slowly cooled rocks conveys information about their cooling history. By using the fast grain boundary(FGB) model to simulate closed-system diffusive exchange of oxygen isotopes between coexisting minerals, I show that the apparent equilibrium temperatures(Tae) by the mineral pair with the largest isotopic fractionation(PLIF) always lies between the closure temperatures(Tc) of those two minerals. Therefore, when the rate of oxygen diffusion and hence Tc for the PLIF chance to be comparable(such as in the case of quartz and magnetite), Tae will serve as a good approximation of Tc regardless of variation in mineral proportions. The specialty of the PLIF in constraining Tae within their Tc range can be generalized to other stable isotope systems and element partitioning. By approximating Tc with Tae and inverting Dodson's equation, the cooling rate of plutonic or metamorphic rocks can be inferred.

关键词：氧同位素分馏封闭温度平衡温度表观共生矿物冷却速率应用 PLIF

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Mechanism and simulation of droplet coalescence in molten steel

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International Journal of Minerals,Metallurgy and Materials 2017年第11期24卷 1251-1259页

作者： Bing ni Tao Zhang Hai-qi ni Zhi-guo Luo Department of Metallurgical Technology Central Iron and Steel Research Institute School of Metallurgy Northeastern University

Droplet coalescence in liquid steel was carefully investigated through observations of the distribution pattern of inclusions in solidified steel samples. The process of droplet coalescence was slow, and the critical Weber number(We) was used to evaluate the coalescence or separation of droplets. The relationship between the collision parameter and the critical We indicated whether slow coalescence or bouncing of droplets occurred. The critical We was 5.5, which means that the droplets gradually coalesce when We ≤ 5.5, whereas they bounce when We > 5.5. For the carbonate wire feeding into liquid steel, a mathematical model implementing a combined computational fluid dynamics(CFD)–discrete element method(DEM) approach was developed to simulate the movement and coalescence of variably sized droplets in a bottom-argon-blowing ladle. In the CFD model, the flow field was solved on the premise that the fluid was a continuous medium. Meanwhile, the droplets were dispersed in the DEM model, and the coalescence criterion of the particles was added to simulate the collision-coalescence process of the particles. The numerical simulation results and observations of inclusion coalescence in steel samples are consistent.

关键词： mechanism simulation droplet collision coalescence molten steel

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Regional features of pollen R-values in China

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Science China Earth Sciences 2024年第1期67卷 295-308页

作者： Jie XIA Jian ni College of Life Sciences Zhejiang Normal UniversityJinhua 321004China Jinhua Mountain Observation and Research Station for Subtropical Forest Ecosystems Jinhua 321004China

Establishing a quantitative relationship between modern pollen and vegetation remains a pivotal but intricate pursuit within the field of Quaternary *** R-value,a well-established and traditional metric characterized by its simplicity and direct applicability,serves to calibrate the nonlinear disparities between surface pollen and modern *** study entails the construction of a comprehensive pollen R-value dataset for China derived from R-values published between 1987 and *** dataset,compiled after rigorous screening,calibration,and standardization processes,encompasses 898 modern pollen sampling sites and 2115 pollen R-value data entries,encapsulating 152 pollen taxa spanning 65 families and 113 *** the extracted R-values yielded the following insights:(1)A macrospatial analysis validates previously established knowledge at a site-specific ***,pollen R-value variations across China are statistically *** two-thirds of pollen taxa exhibit underrepresentation(e.g.,Taxodiaceae,Corylus,nitraria,Tamarix,Cyperaceae,Poaceae,and Fabaceae),while the remaining one-third display overrepresentation(e.g.,Pinus,Picea,Betula,Ephedra,Chenopodiaceae,and Artemisia).The degree of underrepresentation surpasses that of overrepresentation,and the representation patterns of Castanea,Quercus,Polygonaceae,and Asteraceae are contingent upon vegetation types.(2)Pollen R-values follow distinct spatial distribution patterns within *** the woody vegetation region of eastern China,R-values progressively decline from north to south,correlating with rising temperatures and ***,in herbaceous vegetation regions of northern and western China,R-values decrease from east to west and from northeast to southwest,corresponding to increased ***,pollen R-values manifest variation contingent on pollen taxa,vegetation types,and climatic regions,even differing for the same taxa across varying

关键词： Pollen R-value Modern pollen-vegetation relationship Regional pattern Variability Paleovegetation reconstruction

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A FRAMEWORK FOR DOMAIN-SPECIFIC NATURAL LANGUAGE INFORMATION BROKERAGE

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Journal of Systems Science and Systems Engineering 2018年第5期27卷 559-585页

作者： Lin ni Jiamou Liu Department of Computer Science The University of Auckland New Zealand

Service providers - from public institutions to primary care facilities - need to constantly attend toclients＇ inquiries to provide useful information and directive guidelines. Ensuring high quality serviceis challenging as it not only demands detailed domain-specific knowledge, but also the ability toquickly understand the clients＇ issues through their diverse - and often casual - descriptions. Thispaper aims to provide a framework for the development of an automated information broker agent whoperforms the task of a helper. The main task of the agent is to interact with the client and direct them toobtain further services that cater their personalized need. To do so, the agent should accomplish asequence of tasks that include natural language inquiry, knowledge gathering, reasoning, and givingfeedback; in this way, it simulates a human helper to engage in interaction with the client. Theframework combines a question-answering reasoning mechanism while utilizing domain-specificknowledge base. When the users cannot describe clearly their needs, the system tries to narrow downthe possibilities by an iterative question-answering process, until it eventually identifies the target. Inrealizing our framework, we make a proof-of-concept project, M andy, a primary care chatbot systemcreated to assist healthcare staffs by automating the patient intake process. We describe in detail thesystem functionalities and design of the system, and evaluate our proof-of-concept on benchmark casestudies.

关键词： Question and answer system chatbot automated information broker iterative inquiry language processing AI and healthcare

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